CN117318058B - Reactive compensation method and reactive compensation system of power distribution network - Google Patents

Reactive compensation method and reactive compensation system of power distribution network Download PDF

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Publication number
CN117318058B
CN117318058B CN202311260499.5A CN202311260499A CN117318058B CN 117318058 B CN117318058 B CN 117318058B CN 202311260499 A CN202311260499 A CN 202311260499A CN 117318058 B CN117318058 B CN 117318058B
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power
compensation
reactive
distribution network
harmonic
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CN117318058A (en
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王逸兴
陈军健
陶伟
刘德宏
谢心昊
邝野
向柏澄
王泽宇
杨英杰
于杨
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Southern Power Grid Digital Grid Research Institute Co Ltd
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Southern Power Grid Digital Grid Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a reactive power compensation method and a reactive power compensation system of a power distribution network, wherein the reactive power compensation method comprises the following steps: the edge computing device determines the compensating harmonic voltage current and reactive power which are required to be output by the power quality compensating device in each region according to the voltage current harmonic wave and voltage deviation of each region, determines whether the compensating harmonic voltage current actually output by the power quality compensating device corresponding to each region of the power distribution network meets the harmonic suppression requirement and the reactive compensation requirement, and uploads the judging result to the power distribution network master station; and the distribution network master station distributes the compensation harmonic voltage current and the reactive power output by the power quality compensation device of each region according to the judgment result uploaded by the edge calculation device of each region, and then sends a regulation and control instruction to the edge calculation device. The invention can reduce the calculation complexity of the power distribution network master station, reduce the communication pressure of the power distribution network master station, and regulate and control the harmonic suppression and reactive compensation of the power distribution network in real time.

Description

Reactive compensation method and reactive compensation system of power distribution network
Technical Field
The invention relates to the technical field of intelligent power distribution networks, in particular to a reactive power compensation method and a reactive power compensation system of a power distribution network.
Background
New energy, distributed generation, intelligent micro-networks and the like are rapidly developed, the network morphology and the function of a power distribution network are gradually changed, and the power distribution network presents more complex 'multisource' characteristics. With the access of massive power electronic transformers, heavy industrial electric equipment, power electronic loads and new energy power generation equipment to a distribution network, voltage deviation pollution caused by harmonic current and reactive power loss of the distribution network is characterized by dispersion, full networking and the like.
The traditional distributed electric energy management mode is used for intensively processing data at a power distribution network main station, and because the access state of power electronic equipment of the power distribution network is frequently changed, the data of voltage deviation and reactive compensation of the power distribution network in a power distribution network information system are difficult to update in time, so that the power distribution network main station is difficult to regulate and control harmonic suppression and reactive compensation of the power distribution network in real time.
Disclosure of Invention
The reactive compensation method and the reactive compensation system for the power distribution network can reduce the calculation complexity of a main station of the power distribution network, reduce the communication pressure of the main station of the power distribution network, and regulate and control harmonic suppression and reactive compensation of the power distribution network in real time.
In a first aspect, the present invention provides a reactive power compensation method for a power distribution network, including: the method comprises the steps that feeder terminal equipment (FTU) collects voltage data and current data of overhead line nodes of a power distribution network in real time, and voltage and current harmonic waves and voltage deviation of the overhead line nodes of the power distribution network are determined; the distribution transformer terminal equipment DTU collects voltage data and current data of the nodes of the ring main units of the power distribution network in real time, and determines voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network;
The edge computing device determines the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region; each region comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the electric energy quality compensation device comprises an active filter and a static reactive compensator;
The edge computing device determines whether the compensating harmonic voltage current and reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and reactive power required to be output by the power quality compensating device, and uploads key information to a main station of the power distribution network; when the compensating harmonic voltage current actually output by the electric energy quality compensating device does not meet the harmonic suppression requirement and the reactive compensation requirement, the key information comprises the compensating harmonic voltage current, the reactive power which are required to be output by the electric energy quality compensating device and the compensating harmonic voltage current and the reactive power which are redundant by the electric energy quality compensating device;
The edge computing device sends an on-site reactive power adjusting signal and an on-site harmonic voltage and current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage and current and reactive power which are required to be output by the electric energy quality compensating device in each area;
the electric energy quality compensation device respectively regulates and controls the reactive power and harmonic voltage and current of the corresponding node according to the local reactive power regulation signal and the local harmonic voltage and current regulation signal so as to treat the harmonic wave and voltage deviation of each area in situ;
After distributing the compensation harmonic voltage current and the reactive power output by the power quality compensation device of each area according to the key information, the power distribution network master station sends a regulation and control instruction to the edge calculation device;
The edge computing device of each area determines whether the cooperative treatment of the electric energy quality is to be carried out with the edge computing device of the adjacent area according to the regulation and control instruction;
When the edge computing device determines that the cooperative treatment of the power quality is to be carried out on the edge computing device in the adjacent area, the edge computing device sends a reactive power cooperative regulation signal and a harmonic voltage current cooperative regulation signal to the power quality compensating device in the corresponding area according to the regulation and control instruction;
the electric energy quality compensation device respectively regulates and controls the reactive power of adjacent areas and compensates the harmonic voltage and current according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal;
When the edge computing device determines that the cooperative management of the power quality is not carried out on the edge computing devices in the adjacent areas, returning to the step of continuously executing the step that the edge computing device sends an on-site reactive power adjusting signal and an on-site harmonic voltage current adjusting signal according to the compensating harmonic voltage current and the reactive power quality compensating device which are required to be output by the power quality compensating device in each area.
In a second aspect, the present invention provides a reactive compensation system for an electrical distribution network, characterized in that it is adapted to perform the reactive compensation method of the electrical distribution network of the first aspect, the reactive compensation system comprising: the system comprises a power distribution network main station, a power distribution network intelligent terminal, an edge computing device and an electric energy quality compensating device;
The distribution network intelligent terminal comprises a feeder terminal unit DTU and a distribution transformer terminal unit FTU, wherein the FTU is used for collecting voltage data and current data of the overhead line node of the power distribution network in real time and determining voltage and current harmonic waves and voltage deviation of the overhead line node of the power distribution network; the DTU is used for collecting voltage data and current data of the nodes of the ring main units of the power distribution network in real time and determining voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network;
The edge computing device is in communication connection with the plurality of intelligent terminals of the distribution network and is also in communication connection with the electric energy quality compensation device; the edge computing device is used for determining the compensating harmonic voltage current and reactive power which need to be output by the power quality compensating device in each area; each region comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the electric energy quality compensation device comprises an active filter and a static reactive compensator;
The edge computing device is also used for determining whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and uploading key information to a main station of the power distribution network;
When the compensating harmonic voltage current actually output by the electric energy quality compensating device does not meet the harmonic suppression requirement and the reactive compensation requirement, the key information comprises the compensating harmonic voltage current, the reactive power which are required to be output by the electric energy quality compensating device and the compensating harmonic voltage current and the reactive power which are redundant by the electric energy quality compensating device;
the edge computing device is also used for sending an in-situ reactive power adjusting signal and an in-situ harmonic voltage and current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage and current and reactive power which are required to be output by the electric energy quality compensating device in each area;
The electric energy quality compensation device is used for respectively regulating and controlling reactive power and harmonic voltage and current of corresponding areas according to the local reactive power regulating signals and the local harmonic voltage and current regulating signals so as to treat harmonic waves and voltage deviations of all areas in situ;
The power distribution network master station is connected with the edge computing device through a power distribution network gateway and is used for distributing the compensation harmonic voltage current and the reactive power output by the power quality compensation devices of all areas according to key information and then issuing a regulation and control instruction to the edge computing device;
The edge computing device of each area is also used for determining whether the cooperative management of the electric energy quality is to be carried out with the edge computing device of the adjacent area according to the regulation and control instruction; when the edge computing device determines that the cooperative treatment of the power quality is to be carried out on the edge computing device in the adjacent area, the edge computing device sends a reactive power cooperative regulation signal and a harmonic voltage current cooperative regulation signal to the power quality compensating device in the corresponding area according to the regulation and control instruction;
The electric energy quality compensation device is also used for respectively regulating and controlling the reactive power of the adjacent area and compensating the harmonic voltage and current according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal;
when the edge computing device is also used for determining that the cooperative management of the power quality is not carried out with the edge computing devices in the adjacent areas, the on-site reactive power adjusting signal and the on-site harmonic voltage current adjusting signal are continuously sent to the power quality compensating device according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device in each area.
According to the technical scheme of the embodiment of the invention, the edge computing device determines the compensating harmonic voltage current required to be output by the active filter in each region and the reactive power required to be output by the static reactive power compensator in each region according to the voltage current harmonic wave and the voltage deviation of each region, determines whether the compensating harmonic voltage current actually output by the power quality compensating device corresponding to each region of the power distribution network can meet the harmonic suppression requirement and the reactive power compensation requirement according to the compensating harmonic voltage current required to be output by the power quality compensating device and the reactive power, and uploads key information to the power distribution network master station, so that the computing complexity of the power distribution network master station can be reduced, the communication pressure of the power distribution network master station is reduced, and real-time regulation and control are carried out on the harmonic suppression and the reactive power compensation of the power distribution network.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a reactive power compensation method of a power distribution network according to an embodiment of the present invention;
fig. 2 is a flowchart of a reactive compensation method of another power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power-dedicated chip according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for determining, by an edge computing device, a compensating harmonic voltage current and reactive power to be output by a power quality compensating device in each region according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for determining whether the compensated harmonic voltage current and reactive power actually output by the corresponding power quality compensation device meet the harmonic suppression requirement and the reactive compensation requirement;
Fig. 6 is a schematic structural diagram of a reactive compensation system of a power distribution network according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a flowchart of a reactive power compensation method of a power distribution network according to an embodiment of the present invention, where, as shown in fig. 1, the reactive power compensation method of the power distribution network specifically includes the following steps:
S101, a Feeder Terminal Unit (FTU) collects voltage data and current data of a power distribution network overhead line node in real time, and determines voltage and current harmonic waves and voltage deviation of the power distribution network overhead line node; the distribution transformer terminal equipment DTU collects voltage data and current data of the ring main unit area of the power distribution network in real time, and determines voltage and current harmonic waves and voltage deviation of the ring main unit area of the power distribution network.
Specifically, the feeder terminal device (FEEDER TERMINAL Unit, FTU) is a switch monitoring device installed beside the feeder switch. Feeder switches refer to outdoor pole switches such as circuit breakers, load switches, sectionalizers, etc. on 10kV lines. The FTU can monitor and control the quality of the power grid, and the quality and stability of the power grid are improved through real-time monitoring of the data of the power grid.
The power supply and distribution system changes the operation mode and slowly changes the load, so that the voltage of each node of the power supply and distribution system also changes, and the difference between the actual voltage of each node and the nominal voltage of the power supply and distribution system is called voltage deviation. The voltage current harmonic wave refers to the amplitude and phase of each frequency harmonic wave voltage current.
Optionally, the FTU may perform harmonic analysis on voltage data and current data of the overhead line node of the power distribution network, so as to obtain voltage and current harmonics of the overhead line node of the power distribution network, and the FTU subtracts the actual voltage of the overhead line node of the power distribution network from the nominal voltage of the overhead line node of the power distribution network, so as to obtain a voltage deviation of the overhead line node of the power distribution network.
The distribution transformer terminal equipment (Distribution Terminal Unit, DTU) is a data acquisition and monitoring terminal device arranged at a conventional switching station (house), an outdoor small-sized switching station, a ring main unit, a small-sized transformer station, a box-type transformer station and the like. The remote control device has the function of completing position signals of switch equipment formed by an opening and closing station and the like, executing a remote control command of a main station and performing opening and closing operation on a switch.
Optionally, the DTU may perform harmonic analysis on voltage data and current data of the ring main unit node of the power distribution network, so as to obtain voltage and current harmonics of the ring main unit node of the power distribution network, and the DTU subtracts the actual voltage of the ring main unit node of the power distribution network from the nominal voltage of the ring main unit node of the power distribution network, so as to obtain a voltage deviation of the ring main unit node of the power distribution network.
S102, the edge computing device determines the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region.
Each region comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the electric energy quality compensation device comprises an active filter and a static reactive compensator.
Specifically, the voltage and current harmonics of each region include voltage and current harmonics of a plurality of distribution network overhead line nodes and voltage and current harmonics of a plurality of distribution network ring main unit nodes, and the voltage deviation of each region includes voltage deviation of a plurality of distribution network overhead line nodes and voltage deviation of a plurality of distribution network ring main unit nodes.
Each area corresponds to an edge computing device, each node corresponds to an active filter and a static var compensator, the edge computing devices of the areas are communicated with the edge computing devices of the adjacent areas, and the power quality of each area of the power distribution network is coordinated and controlled.
The active filter (Active Power Filter, APF) is connected in parallel in the low-voltage distribution system containing the harmonic load, and can track and compensate the dynamically-changed harmonic current rapidly and in real time. The compensation harmonic voltage current is a quantity obtained by subtracting the fundamental component from the ac quantity, and includes a harmonic voltage content and a harmonic current content.
A static var Compensator (STATIC VAR Compensator, SVC) is a fast, smooth, controllable dynamic reactive power compensation device without rotating components. The controllable reactor and the power capacitor (fixed or group switching) are connected in parallel. The capacitor may emit reactive power (capacitive) and the controllable reactor may absorb reactive power (inductive). By adjusting the reactor, the whole device can be changed smoothly from sending reactive power to absorbing reactive power (or vice versa) and the response is quick.
Alternatively, the edge calculation device may use a machine learning model to determine the compensating harmonic voltage current that the active filter in each region needs to output and the reactive power that the static reactive compensator in each region needs to output. For example, the voltage-current harmonics of the respective regions and the voltage deviations of the respective regions may be input into a pre-trained reactive compensation determination model that outputs the compensation harmonic voltage currents that the active filters in the respective regions need to output and the reactive power that the static reactive compensators in the respective regions need to output. The reactive compensation determining model can be obtained by training a neural network model by adopting compensation harmonic voltage and current required to be compensated by a historical active filter, reactive power required to be output by a historical static reactive compensator, historical voltage and current harmonic and historical voltage deviation.
Optionally, the edge computing device can also conduct intelligent computation in the edge computing chip by adopting a knowledge graph algorithm according to voltage and current harmonic waves, voltage deviation and other data of each region, and determine the compensation harmonic voltage and current required to be output by the active filter in each region and the reactive power required to be output by the static reactive compensator in each region, so that intelligent coordination control of the electric energy quality of each region of the power distribution network is realized.
S1031, the edge computing device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each area of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and uploads key information to a main station of the power distribution network.
When the compensating harmonic voltage current and the reactive power actually output by the power quality compensation device do not meet the harmonic suppression requirement and the reactive compensation requirement, the key information comprises the compensating harmonic voltage current, the reactive power which are required to be output by the power quality compensation device and the compensating harmonic voltage current and the reactive power which are redundant by the power quality compensation device, and when the compensating harmonic voltage current and the reactive power which are actually output by the power quality compensation device do not meet the harmonic suppression requirement and the reactive compensation requirement, the key information comprises the compensating harmonic voltage current, the reactive power which are required to be output by the power quality compensation device and the compensating harmonic voltage current and the reactive power which are deficient by the power quality compensation device.
Specifically, the edge computing device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the magnitude relation between the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device and the compensating harmonic voltage current and the reactive power which are actually output by the power quality compensating device. Illustratively, the harmonic voltage content of the fifth harmonic that the active filter in the first region needs to output is 100V, the rated capacity of the active filter in the first region is 80V (i.e., the compensated harmonic voltage actually output by the active filter in the first region is 80V), and the harmonic suppression requirement cannot be satisfied.
S1032, the edge computing device sends an in-situ reactive power adjusting signal and an in-situ harmonic voltage current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage current and reactive power which are required to be output by the electric energy quality compensating device in each area.
Specifically, step S1031 and step S1032 are performed synchronously in the edge computing device. The static reactive compensator regulates and controls reactive power of a corresponding node according to the local reactive power regulating signal, and the active filter regulates and controls compensating harmonic voltage and current of the corresponding node according to the local harmonic voltage and current regulating signal.
S1041, after the power distribution network master station distributes the compensation harmonic voltage and current and reactive power output by the power quality compensation device of each area according to the key information, a regulation and control instruction is issued to the edge calculation device.
Specifically, the power distribution network master station distributes the compensation harmonic voltage current and the reactive power of the power quality compensation devices in each area according to the magnitude relation between the compensation harmonic voltage current and the reactive power output by the power quality compensation devices in each area and the compensation harmonic voltage current and the reactive power actually output by the power quality compensation devices in each area.
S1042, the electric energy quality compensating device respectively regulates and controls the reactive power and the harmonic voltage current of the corresponding node according to the local reactive power regulating signal and the local harmonic voltage current regulating signal so as to treat the harmonic wave and the voltage deviation of each area in situ.
Optionally, the local reactive power adjustment signal and the local harmonic voltage current adjustment signal respectively include a first value and a second value, the static reactive power compensator regulates and controls the reactive power of the corresponding node according to the first value, and the active filter regulates and controls the reactive power of the corresponding node according to the second value.
When the first value in the local reactive power adjusting signal is larger than the rated capacity of the static reactive power compensator, the static reactive power compensator outputs according to the rated capacity, and when the first value in the local reactive power adjusting signal is smaller than the rated capacity of the static reactive power compensator, the static reactive power compensator outputs according to the first value; similarly, when the second number in the local harmonic voltage current regulation signal is larger than the rated capacity of the active filter, the active filter outputs according to the rated capacity, and when the second number in the local harmonic voltage current regulation signal is smaller than the rated capacity of the active filter, the active filter outputs according to the second number. That is, when the compensating harmonic voltage current of the system load of the distribution network is greater than the rated capacity of the active filter, the active filter can be automatically limited to 100% rated capacity output, and overload does not occur. Similarly, when the reactive power required to be output by the load of the power distribution network system is larger than the rated capacity of the static reactive compensator, the static reactive compensator can be automatically limited to 100% rated capacity output, and overload can not occur.
S105, determining whether the cooperative management of the electric energy quality is to be carried out with the edge computing devices of the adjacent areas according to the regulation and control instruction by the edge computing devices of the areas.
Specifically, the cooperative management of the electric energy quality refers to that when the edge computing device in the area determines that the compensating harmonic voltage current and reactive power output by the electric energy quality compensating device cannot meet the actual demand, and the edge computing device in the adjacent area determines that the rated capacity of the electric energy quality compensating device in the corresponding area is greater than the actual demand, the edge computing device in the adjacent area is required to control and regulate the compensating harmonic voltage current and reactive power in the area according to the regulating and controlling instruction issued by the power distribution network master station, so that the compensating harmonic voltage current and reactive power in the area meet the actual demand.
The edge computing device determines that the electric energy quality of the edge computing device of the adjacent area is subjected to cooperative treatment according to the regulation and control instruction, and the electric energy quality compensating device corresponding to the edge computing device of the area is indicated to be required to output compensating harmonic voltage current and reactive power required to be output to be smaller than rated capacity, so that the excessive compensating harmonic voltage current and reactive power can be distributed to the adjacent area.
The edge computing device determines that the cooperative control of the electric energy quality is not carried out with the edge computing devices in the adjacent areas according to the regulation and control instruction, and the electric energy quality compensating device corresponding to the edge computing device of the area indicates that the compensating harmonic voltage current required to be output and the reactive power required to be output are larger than or equal to the compensating harmonic voltage current and the reactive power required to be output, which are rated to be output, so that the electric energy quality compensating device can only be output according to rated capacity.
Therefore, when the edge computing device determines that the cooperative remediation of the power quality is to be performed by the edge computing device in the area adjacent thereto, step S106 is performed; when the edge computing device determines that the cooperative remediation of the power quality is not performed by the edge computing device of the adjacent area, the step S1032 is executed back.
And S106, the edge computing device sends reactive power cooperative adjustment signals and harmonic voltage current cooperative adjustment signals to the power quality compensation device of the corresponding area according to the regulation and control instruction.
It can be understood that when the edge computing device sends the reactive power cooperative adjustment signal and the harmonic voltage current cooperative adjustment signal to the electric energy quality compensating device of the corresponding area according to the regulation and control instruction, the edge computing device can continuously send the local reactive power adjustment signal and the local harmonic voltage current adjustment signal to the electric energy quality compensating device of the corresponding area, so that intelligent cooperative control of electric energy quality of each area of the power distribution network is realized.
And S107, the electric energy quality compensation device respectively regulates and controls the reactive power and the compensating harmonic voltage and current of the adjacent area according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal.
Optionally, the reactive power cooperative regulation signal and the harmonic voltage current cooperative regulation signal respectively include a third value and a fourth value, the active filter regulates and controls the compensating harmonic voltage current of the adjacent area according to the third value, and the static reactive compensator regulates and controls the compensating harmonic voltage current of the adjacent area according to the fourth value.
The active filter in the first area needs to output a compensation harmonic voltage of 100V, the actual output compensation harmonic voltage is 80V, the static reactive compensator in the first area needs to output a reactive power of 240kvar, the actual output reactive power is 220kvar, the active filter in the second area needs to output a compensation harmonic voltage of 80V, the actual output compensation harmonic voltage is 100V (i.e. the rated capacity is 100V), the static reactive compensator in the second area needs to output a reactive power of 220kvar, the rated output (i.e. the actual output) reactive power is 240kvar, the static reactive compensator in the second area regulates the reactive power of the second area to be 220kvar according to the local reactive power regulation signal, and outputs a reactive power of 20kvar according to the reactive power cooperative regulation signal, and further regulates the reactive power of the first area, the active filter in the second area regulates the compensation harmonic voltage current of the second area to be 80V according to the first harmonic current regulation signal, and the first harmonic voltage regulation signal outputs a reactive power of 20V according to the second harmonic current regulation signal, so that the reactive power of the first harmonic voltage regulation signal meets the actual demand of the first harmonic voltage.
According to the technical scheme of the embodiment of the invention, the edge computing device determines the compensating harmonic voltage current required to be output by the active filter in each region and the reactive power required to be output by the static reactive power compensator in each region according to the voltage current harmonic wave and the voltage deviation of each region, determines whether the compensating harmonic voltage current actually output by the power quality compensating device corresponding to each region of the power distribution network can meet the harmonic suppression requirement and the reactive power compensation requirement according to the compensating harmonic voltage current required to be output by the power quality compensating device and the reactive power, and uploads key information to the power distribution network master station, so that the computing complexity of the power distribution network master station can be reduced, the communication pressure of the power distribution network master station is reduced, and real-time regulation and control are carried out on the harmonic suppression and the reactive power compensation of the power distribution network.
Fig. 2 is a flowchart of another reactive power compensation method for a power distribution network according to an embodiment of the present invention, where, as shown in fig. 2, the reactive power compensation method for a power distribution network specifically includes the following steps:
s201, an intelligent computing module constructs a knowledge graph of the harmonic state and the reactive state of the power distribution network according to the distribution network data.
The distribution network data comprise voltage and current harmonic waves, voltage deviation, unstructured data of each region, switching states of the active filter and the static reactive compensator of each region, rated power, rated voltage and rated current of the active filter and the static reactive compensator of each region.
The unstructured data comprises the geographic position of the area to which each area belongs, and the serial numbers and connection relations of power transmission and distribution equipment in each area. The power transmission and distribution equipment comprises a ring main unit, a power distribution network overhead line, an FTU, a DTU, an active filter, a static reactive compensator and an edge computing device.
The edge computing device includes a power-dedicated chip, and fig. 3 is a schematic diagram of the power-dedicated chip according to an embodiment of the present invention, and as shown in fig. 3, the power-dedicated chip includes an intelligent computing module 21 supporting a knowledge graph.
The intelligent computing module 21 based on the knowledge graph requires the power special chip to support intelligent algorithms such as the knowledge graph algorithm, and the like, so that the intelligent algorithm processor is integrated in the power special chip architecture provided by the invention, and the customized hardware architecture is adopted for the characteristic of intensive data operation of the artificial intelligent algorithm, so that the universality and the high efficiency of the processor are met, the special communication architecture is designed, the communication overhead is reduced, and the operation performance of the algorithm is ensured.
In one embodiment, the intelligent computing module 21 obtains a set of entities in the distribution network data and relationships of a plurality of entities in the set of entities; and constructing a knowledge graph according to the entity set and the relation of a plurality of entities in the entity set according to a preset data mode.
S202, a Feeder Terminal Unit (FTU) collects voltage data and current data of overhead line nodes of a power distribution network in real time, and determines voltage and current harmonics and voltage deviations of the overhead line nodes of the power distribution network; the distribution transformer terminal equipment DTU collects voltage data and current data of the nodes of the ring main units of the power distribution network in real time, and determines voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network.
And S203, the edge computing device determines the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region.
S2041, the edge computing device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each area of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and uploads key information to a main station of the power distribution network.
And S2042, the edge computing device sends an in-situ reactive power adjusting signal and an in-situ harmonic voltage and current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage and current and reactive power which are required to be output by the electric energy quality compensating device in each area.
S2051, after the power distribution network master station distributes the compensation harmonic voltage and current and reactive power output by the power quality compensation device in each area according to the key information, a regulation and control instruction is issued to the edge calculation device.
S2052, the electric energy quality compensation device respectively regulates and controls the reactive power and the harmonic voltage current of the corresponding node according to the local reactive power regulation signal and the local harmonic voltage current regulation signal so as to treat the harmonic wave and the voltage deviation of each area in situ.
S206, determining whether the cooperative management of the electric energy quality is to be carried out with the edge computing devices of the adjacent areas according to the regulation and control instruction by the edge computing devices of the areas.
Executing step S208 when the edge computing device determines that the cooperative treatment of the power quality is to be performed on the edge computing device in the adjacent area; when the edge computing device determines that the cooperative improvement of the power quality is not performed on the edge computing device in the adjacent area, the process returns to step S2052.
And S207, the edge computing device sends reactive power cooperative adjustment signals and harmonic voltage current cooperative adjustment signals to the power quality compensation device of the corresponding area according to the regulation and control instruction.
And S208, the electric energy quality compensation device respectively regulates and controls the reactive power and the compensating harmonic voltage and current of the adjacent area according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal.
FIG. 4 is a flowchart of a method for determining, by an edge computing device, a compensating harmonic voltage current and reactive power to be output by a power quality compensating device in each region according to an embodiment of the present invention; fig. 5 is a flowchart of a method for determining whether the compensated harmonic voltage current and reactive power actually output by the corresponding power quality compensation device meet the harmonic suppression requirement and the reactive compensation requirement.
Optionally, the edge computing device further comprises a real-time heterogeneous module; referring to fig. 4, the specific steps of the edge calculating device for determining the compensating harmonic voltage current and reactive power to be output by the power quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region include:
S301, determining a first relation and a second relation by the real-time heterogeneous module according to a knowledge graph of the harmonic state and the reactive state of the distribution network.
The first relation is the relation between the compensation harmonic voltage and current of each region of the power distribution network, the output power of the active filter and the harmonic compensation times of the voltage and current, and the second relation is the relation between the voltage deviation of each region of the power distribution network and the output reactive power of the static reactive compensator.
Optionally, with continued reference to fig. 3, the power-dedicated chip further includes a real-time heterogeneous module 22, where the real-time heterogeneous module 22 is composed of two heterogeneous CK810 cores, and timely responds to and rapidly processes the power quality processing service in the power distribution network.
S302, determining the compensating harmonic voltage current and reactive power which need to be output by the power quality compensating device in each area according to the first relation and the second relation.
For example, the harmonic voltage content of the 2 nd harmonic in the first region is 10V, the harmonic current content is 2a, the harmonic voltage content of the 3 rd harmonic is 5V, and the harmonic current content is 3A, so that the output power of the active filter corresponding to the first region should be 35W, and if the rated power of the active filter is only 15W, the compensation requirement cannot be satisfied.
When a transmission line or transformer transmits power, the current will generate voltage loss on the line or transformer impedance, and a new transmission line is taken as an example for analysis: a single-phase equivalent circuit of a section of power transmission line, wherein R, X is the resistance and equivalent reactance of a certain phase, U1 and U2 are the voltages of the head and tail phases, and I is the phase current flowing in the line. Taking line terminal voltage U2 as a reference axis, setting line current I as inductive load current, lagging the terminal voltage U2 by an angle phi, generating a voltage drop IR when the current flows through the line resistor, which is in the same direction as the current vector, and generating a voltage drop IX on the line when the line current is advanced by 90 DEG in advance of the current vector, wherein line head-end voltage U1 is the sum of three voltages U2, IR and IX.
Namely, the second relationship is: Δu= (pr+qx)/U 2;
It follows that the voltage deviation deltau is determined by both the line delivered power (including active power P and reactive power Q) and the line impedance parameters (resistance R and reactance X). In general, on the premise of meeting the active power of the load, it is very difficult to change the active power transmitted by a power supply line and a transformer. Therefore, if the transmission power of the line or the transformer is to be changed, only the reactive power is changed, so that the reactive power Q is reduced.
Optionally, the power special chip includes a real-time heterogeneous module, referring to fig. 5, the specific steps for determining whether the compensated harmonic voltage current and reactive power actually output by the corresponding power quality compensation device meet the harmonic suppression requirement and the reactive compensation requirement include:
s401, the edge computing device determines whether the compensating harmonic voltage current actually output by the power quality compensating device corresponding to each region of the power distribution network can meet harmonic suppression requirements and reactive power compensation requirements according to the compensating harmonic voltage current and reactive power which are required to be output by the power quality compensating device.
When the compensating harmonic voltage and current actually output by the power quality compensating device meet the harmonic suppression requirement and the reactive compensation requirement, executing step S4021; when the compensated harmonic voltage and current actually output by the power quality compensation device do not meet the harmonic suppression requirement and the reactive compensation requirement, the step S4021 is executed, and the step S4022 is executed.
S4021, establishing a harmonic suppression constraint relation and a reactive compensation constraint relation of each region of the power distribution network by the real-time heterogeneous module.
The harmonic suppression constraint relation is that the compensating harmonic voltage current actually output by the active filter is smaller than or equal to the compensating harmonic voltage current required to be output, and the reactive compensation constraint relation is that the reactive power actually output by the static reactive compensator is smaller than or equal to the reactive power required to be output. A harmonic suppression constraint relationship and a reactive compensation relationship are established to prevent overcompensation of the system.
S4022, the real-time heterogeneous module determines compensation harmonic voltage current and reactive power which need to be distributed by the power quality compensation device between adjacent areas.
Specifically, the real-time heterogeneous module determines the compensating harmonic voltage current and reactive power to be distributed by the power quality compensation device between adjacent areas according to the magnitude relation between the compensating harmonic voltage current and reactive power to be output by the power quality compensation device and the compensating harmonic voltage current and reactive power actually output by the power quality compensation device. For example, the harmonic voltage content of the 2 nd harmonic in the first area is 10V, the harmonic current content is 2a, the harmonic voltage content of the 3 rd harmonic is 5V, the harmonic current content is 3A, the required output power of the active filter corresponding to the first area should be 35W, if the rated power (actual output) of the active filter is only 15W, the compensation requirement is not satisfied, at this time, the active filter in the second area can be allocated to the harmonic of the first area 20W, if the active filter in the second area can only be allocated to the harmonic of the first area 10W, then it is determined whether the active filter in the third area can be allocated to the harmonic of the first area 10W, if the active filter in the third area can still not be allocated to the harmonic of the first area 10W, then it is determined whether the active filter in the fourth area can be allocated to the harmonic of the first area 10W, and so on until the compensation harmonic voltage current required to be output in the first area satisfies the requirement. Similarly, the reactive power compensation is performed according to the logic, and will not be described herein.
Fig. 6 is a schematic structural diagram of a reactive power compensation system of a power distribution network according to an embodiment of the present invention, where the reactive power compensation system is used in the reactive power compensation method of the power distribution network according to any of the foregoing embodiments, and as shown in fig. 6, the reactive power compensation system includes: the power distribution network comprises a power distribution network main station 11, a power distribution network intelligent terminal, an edge computing device 13 and a power quality compensating device 14, wherein the power quality compensating device 14 comprises an active filter and a static reactive compensator.
The distribution network intelligent terminal comprises a feeder terminal device 120 and a distribution transformer terminal device 121, wherein the feeder terminal device 120 is used for collecting voltage data and current data of the overhead line node of the power distribution network in real time and determining voltage and current harmonic waves and voltage deviation of the overhead line node of the power distribution network; the distribution transformer terminal equipment 121 is used for collecting voltage data and current data of the nodes of the ring main units of the power distribution network in real time and determining voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network;
The edge computing device 13 is in communication connection with a plurality of distribution network intelligent terminals, and the edge computing device 13 is also in communication connection with the power quality compensation device 14; the edge calculating device 13 is used for determining the compensating harmonic voltage current and reactive power which need to be output by the power quality compensating device 14 in each area;
The edge computing device 13 is further configured to determine, according to the compensated harmonic voltage current and the reactive power that the power quality compensating device 14 needs to output, whether the compensated harmonic voltage current and the reactive power that the power quality compensating device 14 corresponding to each area of the power distribution network actually outputs meet a harmonic suppression requirement and a reactive compensation requirement, and upload key information to a main station of the power distribution network;
When the compensating harmonic voltage current and reactive power actually output by the power quality compensating device 14 meet the harmonic suppression requirement and the reactive compensation requirement, the key information includes the compensating harmonic voltage current, reactive power, and redundant compensating harmonic voltage current and redundant reactive power of the power quality compensating device, and when the compensating harmonic voltage current and reactive power actually output by the power quality compensating device do not meet the harmonic suppression requirement and the reactive compensation requirement, the key information includes the compensating harmonic voltage current, reactive power, and compensating harmonic voltage current and reactive power of the power quality compensating device;
The edge calculation device 13 is further configured to send an in-situ reactive power adjustment signal and an in-situ harmonic voltage current adjustment signal to the corresponding power quality compensation device according to the compensation harmonic voltage current and reactive power that the power quality compensation device in each region needs to output; each area comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the power quality compensation device 13 comprises an active filter and a static reactive compensator.
The power quality compensation device 13 is used for respectively regulating and controlling the reactive power and the harmonic voltage and current of the corresponding area according to the local reactive power regulating signal and the local harmonic voltage and current regulating signal so as to treat the harmonic wave and the voltage deviation of each area in situ.
The power distribution network main station 11 is connected with the edge computing device 13 through the power distribution network gateway 10, and the power distribution network main station 11 is used for distributing the compensation harmonic voltage current and the reactive power output by the power quality compensation devices of all areas according to key information and then issuing regulation and control instructions to the edge computing device.
The edge computing device 13 of each area is also used for determining whether the cooperative management of the electric energy quality is to be carried out with the edge computing device 13 of the adjacent area according to the regulation and control instruction; when the edge computing device 13 determines that the cooperative management of the power quality is to be performed on the edge computing device 13 of the adjacent area, the edge computing device 13 sends a reactive power cooperative adjustment signal and a harmonic voltage current cooperative adjustment signal to the power quality compensating device 14 of the corresponding area according to the regulation command.
The power quality compensation device 14 is further configured to regulate the reactive power and compensate the harmonic voltage and current in the adjacent areas according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal, respectively;
The edge computing device 13 is further configured to, when it is determined that the cooperative governance of the power quality is not performed with the edge computing devices in the adjacent areas, continuously send an in-situ reactive power adjustment signal and an in-situ harmonic voltage current adjustment signal to the power quality compensating device according to the compensated harmonic voltage current and reactive power that the power quality compensating device in each area needs to output.
Optionally, the edge computing device 13 comprises a power-specific chip comprising an intelligent computing module 21 supporting a knowledge graph; the intelligent computing module 21 is used for constructing a knowledge graph of the harmonic state and the reactive state of the power distribution network according to the distribution network data; the distribution network data comprise voltage and current harmonic waves, voltage deviation, unstructured data of each region, switching states of the active filter and the static reactive compensator of each region, rated power, rated voltage and rated current of the active filter and the static reactive compensator of each region.
Optionally, the power-specific chip further includes a real-time heterogeneous module 22; the real-time heterogeneous module 22 is configured to determine a first relationship and a second relationship according to a knowledge graph of a harmonic state and a reactive state of the distribution network; the first relation is the relation between the compensating harmonic voltage and current of each region of the power distribution network, the output power of the active filter and the harmonic compensation times of the voltage and current, and the second relation is the relation between the voltage deviation of each region of the power distribution network and the output reactive power of the static reactive compensator; the real-time heterogeneous module 22 is further configured to determine, according to the first relationship and the second relationship, a compensating harmonic voltage current and reactive power that need to be output by the power quality compensation device in each region.
Optionally, the real-time heterogeneous module 22 is further configured to establish a harmonic suppression constraint relationship and a reactive compensation constraint relationship for each region of the power distribution network when the compensated harmonic voltage and current actually output by the power quality compensation device 14 meet the harmonic suppression requirement and the reactive compensation requirement.
Optionally, the real-time heterogeneous module 22 is further configured to determine the compensating harmonic voltage current and reactive power that need to be distributed by the power quality compensation device 14 between adjacent areas when the compensating harmonic voltage current actually output by the power quality compensation device 14 does not meet the harmonic suppression requirement and the reactive power compensation requirement.
Optionally, the special power chip further comprises a main control module 23, wherein the main control module 23 is composed of two isomorphic CK860CPU cores, and the main control module is used as a support of the whole special power chip to cope with wide data sources and process complex and changeable services.
Optionally, the power-dedicated chip further includes a power-dedicated algorithm module 24, and the power-dedicated algorithm module 24 hardens the power-inherent algorithm for acceleration purposes. Wherein the special MAC for electric power is responsible for information communication, the electric power sampling ADC is responsible for external ADC sampling control, the time scale management RTC keeps information such as tracking time and date, and the like, and the accuracy of time is ensured
Optionally, the special power chip further comprises an embedded security module 25, and the embedded security module 25 integrates a multi-security core of the black iron series CK802, an anti-attack algorithm hardware module and an IPSec network protocol acceleration engine, so that data isolation and encryption of the multi-element security service are realized.
The modules are distinguished by their function and are combined into an organic whole by an on-chip bus, each of which is interconnected by a bus. For functional modules with high real-time requirements, proprietary interconnections and storage are provided, and in addition, the memory controller 26 may be used to implement preemptive scheduling, multi-interface sharing, and bandwidth management. Preemptive scheduling, namely dividing the time slot of the CPU into given processes to work, can effectively improve the utilization rate of the CPU, and multi-interface sharing and bandwidth management are used for coordinating communication among all modules and resource allocation.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A reactive power compensation method for a power distribution network, comprising:
The method comprises the steps that feeder terminal equipment (FTU) collects voltage data and current data of power distribution network overhead line nodes in real time, and determines voltage and current harmonics and voltage deviations of the power distribution network overhead line nodes; the distribution transformer terminal equipment DTU collects voltage data and current data of the nodes of the ring main units of the power distribution network in real time, and determines voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network;
The edge computing device determines the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region; each region comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the electric energy quality compensation device comprises an active filter and a static reactive compensator;
The edge computing device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and uploads key information to a main station of the power distribution network; when the actual output compensation harmonic voltage current and reactive power of the electric energy quality compensation device meet harmonic suppression requirements and reactive compensation requirements, the key information comprises the compensation harmonic voltage current and reactive power which are required to be output by the electric energy quality compensation device and the redundant compensation harmonic voltage current and redundant reactive power of the electric energy quality compensation device, and when the actual output compensation harmonic voltage current and reactive power of the electric energy quality compensation device do not meet harmonic suppression requirements and reactive compensation requirements, the key information comprises the compensation harmonic voltage current and reactive power which are required to be output by the electric energy quality compensation device and the compensation harmonic voltage current and the reactive power which are deficient by the electric energy quality compensation device;
The edge computing device sends an in-situ reactive power adjusting signal and an in-situ harmonic voltage and current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage and current and reactive power which are required to be output by the electric energy quality compensating device in each region;
The electric energy quality compensation device respectively regulates and controls the reactive power and the harmonic voltage current of the corresponding node according to the local reactive power regulation signal and the local harmonic voltage current regulation signal so as to treat the harmonic wave and the voltage deviation of each area in situ;
The power distribution network master station distributes the compensation harmonic voltage and current and reactive power output by the power quality compensation devices of all areas according to the key information and then sends a regulation and control instruction to the edge calculation device;
The edge computing device of each area determines whether to carry out cooperative management on the electric energy quality with the edge computing devices of the adjacent areas according to the regulation and control instruction;
When the edge computing device determines that the cooperative treatment of the electric energy quality is to be carried out on the edge computing device in the adjacent area, the edge computing device sends a reactive power cooperative regulation signal and a harmonic voltage current cooperative regulation signal to the electric energy quality compensating device in the corresponding area according to the regulation and control instruction;
the electric energy quality compensation device respectively regulates and controls the reactive power and the compensating harmonic voltage current of the adjacent area according to the reactive power cooperative regulation signal and the harmonic voltage current cooperative regulation signal;
And when the edge computing device determines that the cooperative management of the power quality is not carried out on the edge computing devices in the adjacent areas, returning to the step of continuously executing the step that the edge computing device sends an on-site reactive power adjusting signal and an on-site harmonic voltage current adjusting signal according to the compensating harmonic voltage current and reactive power quality compensating device which are required to be output by the power quality compensating device in each area.
2. The reactive power compensation method of a power distribution network according to claim 1, wherein the edge computing device comprises a power dedicated chip, the power dedicated chip comprises an intelligent computing module supporting a knowledge graph, and before the edge computing device determines, according to voltage-current harmonics and voltage deviations of each region, compensation harmonic voltage currents and reactive power to be output by the power quality compensating device in each region, the method further comprises:
the intelligent computing module constructs a knowledge graph of the harmonic state and the reactive state of the power distribution network according to the distribution network data;
the distribution network data comprise voltage and current harmonic waves, voltage deviation, unstructured data of each region, switching states in the active filter and the static reactive compensator of each region, rated power, rated voltage and rated current of the active filter and the static reactive compensator of the distribution network.
3. The reactive compensation method of a power distribution network according to claim 2, wherein the power-dedicated chip further comprises a real-time heterogeneous module;
the edge calculating device determines the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the voltage current harmonic wave and the voltage deviation of each region, and the edge calculating device comprises:
The real-time heterogeneous module determines a first relation and a second relation according to a knowledge graph of a harmonic state and a reactive state of the distribution network; the first relation is a relation between the compensation harmonic voltage and current of each region of the power distribution network, the output power of the active filter and the frequency of voltage and current harmonic compensation, and the second relation is a relation between the voltage deviation of each region of the power distribution network and the output reactive power of the static reactive compensator;
and determining the compensating harmonic voltage current and reactive power which need to be output by the power quality compensating device in each region according to the first relation and the second relation.
4. The reactive compensation method of a power distribution network according to claim 2, wherein the power-dedicated chip comprises a real-time heterogeneous module;
the edge calculating device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive power compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and the edge calculating device comprises:
When the compensation harmonic voltage and current actually output by the electric energy quality compensation device meet the harmonic suppression requirement and the reactive compensation requirement, the real-time heterogeneous module establishes a harmonic suppression constraint relation and a reactive compensation constraint relation of each region of the power distribution network; the harmonic suppression constraint relation is that the compensation harmonic voltage current actually output by the active filter is smaller than or equal to the compensation harmonic voltage current required to be output, and the reactive compensation constraint relation is that the reactive power actually output by the static reactive compensator is smaller than or equal to the reactive power required to be output.
5. The reactive power compensation method of a power distribution network according to claim 4, wherein the edge calculating device determines whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each area of the power distribution network meet the harmonic suppression requirement and the reactive power compensation requirement according to the compensating harmonic voltage current and the reactive power to be output by the power quality compensating device, and further comprises:
when the compensating harmonic voltage and current actually output by the electric energy quality compensation device do not meet the harmonic suppression requirement and the reactive power compensation requirement, the real-time heterogeneous module determines compensating harmonic voltage and current and reactive power which need to be distributed by the electric energy quality compensation device between adjacent areas.
6. A reactive power compensation system for an electrical distribution network, for performing a reactive power compensation method of an electrical distribution network according to any of claims 1-5, the reactive power compensation system comprising: the system comprises a power distribution network main station, a power distribution network intelligent terminal, an edge computing device and an electric energy quality compensating device;
The distribution network intelligent terminal comprises a feeder terminal device DTU and a distribution transformer terminal device FTU, wherein the FTU is used for collecting voltage data and current data of the overhead line node of the power distribution network in real time and determining voltage and current harmonic waves and voltage deviation of the overhead line node of the power distribution network; the DTU is used for collecting voltage data and current data of the nodes of the ring main units of the power distribution network in real time and determining voltage and current harmonics and voltage deviations of the nodes of the ring main units of the power distribution network;
The edge computing device is in communication connection with a plurality of intelligent terminals of the distribution network, and is also in communication connection with the electric energy quality compensation device; the edge computing device is used for determining the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each area;
The edge computing device is also used for determining whether the compensating harmonic voltage current and the reactive power actually output by the power quality compensating device corresponding to each region of the power distribution network meet harmonic suppression requirements and reactive compensation requirements according to the compensating harmonic voltage current and the reactive power which are required to be output by the power quality compensating device, and uploading key information to a main station of the power distribution network;
When the actual output compensation harmonic voltage current and reactive power of the electric energy quality compensation device meet harmonic suppression requirements and reactive compensation requirements, the key information comprises the compensation harmonic voltage current and reactive power which are required to be output by the electric energy quality compensation device and the redundant compensation harmonic voltage current and redundant reactive power of the electric energy quality compensation device, and when the actual output compensation harmonic voltage current and reactive power of the electric energy quality compensation device do not meet harmonic suppression requirements and reactive compensation requirements, the key information comprises the compensation harmonic voltage current and reactive power which are required to be output by the electric energy quality compensation device and the compensation harmonic voltage current and the reactive power which are deficient by the electric energy quality compensation device;
the edge computing device is also used for sending an in-situ reactive power adjusting signal and an in-situ harmonic voltage and current adjusting signal to the corresponding electric energy quality compensating device according to the compensating harmonic voltage and current and reactive power which are required to be output by the electric energy quality compensating device in each region; each region comprises a plurality of distribution network overhead line nodes and a plurality of distribution network ring main unit nodes, and the electric energy quality compensation device comprises an active filter and a static reactive compensator;
the electric energy quality compensation device is used for respectively regulating and controlling reactive power and harmonic voltage current of corresponding areas according to the local reactive power regulating signal and the local harmonic voltage current regulating signal so as to treat harmonic waves and voltage deviations of all areas in situ;
The power distribution network master station is connected with the edge computing device through a power distribution network gateway and is used for distributing the compensation harmonic voltage current and the reactive power output by the power quality compensation device of each area according to the key information and then issuing a regulation and control instruction to the edge computing device;
the edge computing device of each area is also used for determining whether the cooperative management of the electric energy quality is to be carried out with the edge computing device of the adjacent area according to the regulation and control instruction; when the edge computing device determines that the cooperative treatment of the electric energy quality is to be carried out on the edge computing device in the adjacent area, the edge computing device sends a reactive power cooperative regulation signal and a harmonic voltage current cooperative regulation signal to the electric energy quality compensating device in the corresponding area according to the regulation and control instruction;
the electric energy quality compensation device is also used for respectively regulating and controlling the reactive power of the adjacent area and compensating the harmonic voltage and current according to the reactive power cooperative regulation signal and the harmonic voltage and current cooperative regulation signal;
And the edge computing device is also used for continuously sending an in-situ reactive power adjusting signal and an in-situ harmonic voltage current adjusting signal to the electric energy quality compensating device according to the compensating harmonic voltage current and reactive power which are required to be output by the electric energy quality compensating device in each area when the edge computing device in the adjacent area is not used for carrying out cooperative management on the electric energy quality.
7. The reactive compensation system of a power distribution network of claim 6, wherein the edge computing device comprises a power-specific chip comprising an intelligent computing module supporting a knowledge graph;
The intelligent computing module is used for constructing a knowledge graph of the harmonic state and the reactive state of the power distribution network according to the distribution network data; the distribution network data comprise voltage and current harmonic waves, voltage deviation, unstructured data of each region, switching states in the active filter and the static reactive compensator of each region, rated power, rated voltage and rated current of the active filter and the static reactive compensator of the distribution network.
8. The reactive compensation system of a power distribution network of claim 7, wherein the power-dedicated chip further comprises a real-time heterogeneous module;
The real-time heterogeneous module is used for determining a first relation and a second relation according to a knowledge graph of the harmonic state and the reactive state of the distribution network; the first relation is a relation between the compensation harmonic voltage and current of each region of the power distribution network, the output power of the active filter and the frequency of voltage and current harmonic compensation, and the second relation is a relation between the voltage deviation of each region of the power distribution network and the output reactive power of the static reactive compensator;
the real-time heterogeneous module is also used for determining the compensating harmonic voltage current and reactive power which need to be output by the electric energy quality compensating device in each region according to the first relation and the second relation.
9. The reactive compensation system of a power distribution network according to claim 8, wherein the real-time heterogeneous module is further configured to establish a harmonic suppression constraint relationship and a reactive compensation constraint relationship for each region of the power distribution network when the compensated harmonic voltage and current actually output by the power quality compensation device meet a harmonic suppression requirement and a reactive compensation requirement.
10. The reactive compensation system of a power distribution network of claim 9, wherein the real-time heterogeneous module is further configured to determine the compensating harmonic voltage current and reactive power to be distributed by the power quality compensation device between adjacent areas when the compensating harmonic voltage current actually output by the power quality compensation device does not meet the harmonic suppression requirement and the reactive compensation requirement.
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