CN112531772A - Reactive power control method, device and system, storage medium and electronic device - Google Patents

Reactive power control method, device and system, storage medium and electronic device Download PDF

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Publication number
CN112531772A
CN112531772A CN202011360201.4A CN202011360201A CN112531772A CN 112531772 A CN112531772 A CN 112531772A CN 202011360201 A CN202011360201 A CN 202011360201A CN 112531772 A CN112531772 A CN 112531772A
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Prior art keywords
power
side converter
grid
actual active
reactive
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Inventor
黄颂儒
姜颖异
黄猛
党培育
郭泳颖
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202011360201.4A priority Critical patent/CN112531772A/en
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention provides a reactive power control method, a device, a system, a storage medium and an electronic device, wherein the method comprises the following steps: the method comprises the steps of obtaining the power generation power of a photovoltaic cell panel and obtaining the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment; calculating reactive power of a grid side converter according to the generated power and the consumed power, wherein the grid side converter is connected between the machine side converter and an AC city grid; and adjusting the power factor of the AC city grid based on the reactive power. The invention solves the technical problem of large energy waste of the photovoltaic system in the related technology, improves the power factor of the power grid and improves the operation stability of the system.

Description

Reactive power control method, device and system, storage medium and electronic device
Technical Field
The invention relates to the field of automatic control, in particular to a reactive power control method, a reactive power control device, a reactive power control system, a reactive power control storage medium and an electronic device.
Background
In the related art, the existing photovoltaic systems such as photovoltaic air conditioners and the like are widely applied and are good application systems for collecting and absorbing new energy on site; there are some disadvantages that result in limited application of the photovoltaic air conditioning system.
In the related art, taking a photovoltaic air conditioner as an example, a photovoltaic air conditioning system has a single function, and is only used for driving a compressor in the air conditioning system to refrigerate by using photovoltaic power generation, or generating power for a power grid by using residual electricity of a solar cell panel. The photovoltaic air conditioning system is designed according to the refrigerating capacity of the air conditioner, and the electric capacity is fixed; generally, under the condition that refrigeration is not needed at night or in winter, or under the condition that the photovoltaic power generation power is very small and the refrigeration power is very small, the photovoltaic air conditioning system is in an idle state, and huge energy waste is caused.
In view of the above problems in the related art, no effective solution has been found at present.
Disclosure of Invention
The embodiment of the invention provides a reactive power control method, a device, a system, a storage medium and an electronic device, which aim to solve the technical problem of large energy waste of a photovoltaic system in the related technology.
According to an embodiment of the present invention, there is provided a reactive power control method including: the method comprises the steps of obtaining the power generation power of a photovoltaic cell panel and obtaining the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment; calculating reactive power of a grid side converter according to the generated power and the consumed power, wherein the grid side converter is connected between the machine side converter and an AC city grid; and adjusting the power factor of the AC city grid based on the reactive power.
Optionally, calculating the reactive power of the grid-side converter according to the generated power and the consumed power includes: calculating the actual active power of the grid-side converter according to the power consumption power and the power generation power; and calculating the reactive power of the grid-side converter according to the actual active power and the apparent power of the grid-side converter.
Optionally, calculating the actual active power of the grid-side converter according to the consumed power and the generated power includes: when the power consumption power is equal to the power generation power, determining that the actual active power is 0; when the generated power is 0, determining the consumed power as the actual active power of the grid-side converter; when the power consumption power is 0, determining the generated power as the actual active power of the grid-side converter; when the generated power is greater than the consumed power, determining a difference value between the generated power and the consumed power as an actual active power of the grid-side converter; when the generated power is smaller than the consumed power, determining a difference value between the consumed power and the generated power as an actual active power of the grid-side converter; and when the power consumption power and the power generation power are both 0, determining that the actual active power is 0.
Optionally, calculating the reactive power of the grid-side converter according to the actual active power and the apparent power of the grid-side converter includes: when the actual active power is 0, determining the apparent power as the reactive power of the grid-side converter; when the actual active power is the power consumption power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000021
Figure BDA0002803789300000022
wherein Sgidd is the apparent power, and Pgidd is the actual active power; when the actual active power is the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000023
wherein Sgidd is the apparent power, and Pgidd is the actual active power; when the actual active power is the difference value between the generated power and the consumed power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000024
wherein Sgidd is the apparent power, and Pgidd is the actual active power; when the actual active power is the difference value between the consumed power and the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000025
Figure BDA0002803789300000026
wherein Sgidd is the apparent power, and Pgidd is the actual active power.
Optionally, adjusting the power factor of the ac grid based on the reactive power includes: and issuing the reactive power to a control loop of the grid-side converter so that the AC main grid improves the power factor aiming at the photovoltaic load based on the reactive power, wherein the control loop is connected with the AC main grid.
Optionally, the machine side converter is a DC/AC machine side converter, and the grid side converter is an AC/DC grid side converter.
According to another embodiment of the present invention, there is provided a reactive power control apparatus including: the photovoltaic load comprises electric equipment and a machine side converter, wherein the machine side converter is connected between the photovoltaic cell panel and the electric equipment; the calculating module is used for calculating reactive power of a network side converter according to the generated power and the consumed power, wherein the network side converter is connected between the machine side converter and an AC city network; and the adjusting module is used for adjusting the power factor of the AC city grid based on the reactive power.
Optionally, the calculation module includes: the first calculating unit is used for calculating the actual active power of the grid-side converter according to the power consumption power and the power generation power; and the second calculating unit is used for calculating the reactive power of the grid side converter according to the actual active power and the apparent power of the grid side converter.
Optionally, the first computing unit includes: a first calculating subunit, configured to determine that the actual active power is 0 when the consumed power and the generated power are equal to each other; the second calculating subunit is used for determining the power consumption power as the actual active power of the grid-side converter when the generated power is 0; a third calculating subunit, configured to determine the generated power as an actual active power of the grid-side converter when the power consumption power is 0; the fourth calculating subunit is configured to determine, when the generated power is greater than the consumed power, a difference between the generated power and the consumed power as an actual active power of the grid-side converter; a fifth calculating subunit, configured to determine, when the generated power is smaller than the consumed power, a difference between the consumed power and the generated power as an actual active power of the grid-side converter; and the sixth calculating subunit is configured to determine that the actual active power is 0 when both the power consumption power and the power generation power are 0.
Optionally, the second calculating unit includes: a first calculating subunit, configured to determine the apparent power as a reactive power of the grid-side converter when the actual active power is 0; a second calculating subunit, configured to calculate, when the actual active power is the consumed power, a reactive power qgidd of the grid-side converter based on the following formula:
Figure BDA0002803789300000031
wherein Sgidd is the apparent power, and Pgidd is the actual active power; a third calculating subunit, configured to, when the actual active power is the generated power, calculate the actual active power based on the following formulaCalculating the reactive power Qgird of the grid side converter:
Figure BDA0002803789300000032
wherein Sgidd is the apparent power, and Pgidd is the actual active power; a fourth calculating subunit, configured to calculate a reactive power qgidd of the grid-side converter based on the following formula when the actual active power is a difference between the generated power and the consumed power:
Figure BDA0002803789300000041
wherein Sgidd is the apparent power, and Pgidd is the actual active power; a fifth calculating subunit, configured to calculate a reactive power Qgird of the grid-side converter based on the following formula when the actual active power is a difference between the consumed power and the generated power:
Figure BDA0002803789300000042
wherein Sgidd is the apparent power, and Pgidd is the actual active power.
Optionally, the adjusting module includes: and the issuing unit is used for issuing the reactive power to a control loop of the grid-side converter so as to enable the AC mains network to improve the power factor aiming at the photovoltaic load based on the reactive power, wherein the control loop is connected with the AC mains network.
Optionally, the machine side converter is a DC/AC machine side converter, and the grid side converter is an AC/DC grid side converter.
According to another embodiment of the present invention, there is provided a reactive power control system including: the system comprises a photovoltaic system, a reactive power controller and an AC city network, wherein the reactive power controller is connected with the photovoltaic system and the AC city network and comprises the device described in the embodiment; the photovoltaic system comprises a photovoltaic cell panel, a photovoltaic load and a grid side converter, wherein the grid side converter is connected into the AC city grid, and the photovoltaic load comprises electric equipment and a machine side converter.
According to a further embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps in any of the apparatus embodiments described above when executed.
According to yet another embodiment of the present invention, there is also provided an electronic device, including a memory in which a computer program is stored and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.
According to the invention, the power generation power of the photovoltaic cell panel is obtained, the power consumption power of the photovoltaic load is obtained, the reactive power of the grid-side converter is calculated according to the power generation power and the power consumption power, the power factor of the AC city grid is adjusted based on the reactive power, the reactive power of the whole circuit is calculated based on the actual operation working condition of the photovoltaic load and the photovoltaic cell panel, and the power factor of the AC city grid is further improved based on the reactive power, so that the energy loss caused by the reactive power is reduced, the technical problem of high energy waste of a photovoltaic system in the related technology is solved, the power factor of the power grid is improved, and the operation stability of the system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a hardware configuration of a controller according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling reactive power according to an embodiment of the present invention;
FIG. 3 is a system topology diagram of an embodiment of the present invention;
FIG. 4 is a circuit topology diagram of an air conditioner compressor according to an embodiment of the present invention;
FIG. 5 is a block diagram of a control loop of an embodiment of the present invention;
FIG. 6 is a control flow diagram of reactive power of an embodiment of the present invention;
fig. 7 is a block diagram of a reactive power control apparatus according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
The method provided by the first embodiment of the present application may be executed in a controller, a computer, or a similar electronic device. Taking an example of the operation on a controller, fig. 1 is a hardware structure block diagram of a controller according to an embodiment of the present invention. As shown in fig. 1, the controller 10 may include one or more (only one shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, and optionally may also include a transmission device 106 for communication functions and an input-output device 108. It will be understood by those skilled in the art that the structure shown in fig. 1 is merely illustrative and is not intended to limit the structure of the controller. For example, the controller 10 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
The memory 104 may be used to store a controller program, for example, a software program and a module of an application software, such as a controller program corresponding to a picture uploading method in an embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the controller program stored in the memory 104, so as to implement the method described above. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the controller 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the controller 10. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
In the present embodiment, a method for controlling reactive power is provided, and fig. 2 is a flowchart of a method for controlling reactive power according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
step S202, acquiring the power generation power of a photovoltaic cell panel and acquiring the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment;
in this embodiment, the electric device may be various types of energy consuming devices, specifically, an electronic device such as an air conditioner and a refrigerator, and the present embodiment takes an air conditioner compressor as an example for description. Optionally, the machine side converter is a DC/AC machine side converter, the grid side converter is an AC/DC grid side converter, and the converter types of the machine side converter and the grid side converter may also be adapted according to the power supply mode and the power taking mode of the whole circuit.
Step S204, calculating reactive power of a network side converter according to the generated power and the consumed power, wherein the network side converter is connected between a machine side converter and an AC city network;
and step S206, adjusting the power factor of the AC city grid based on the reactive power.
Through the steps, the power generation power of the photovoltaic cell panel is obtained, the power consumption power of the photovoltaic load is obtained, the reactive power of the grid-side converter is calculated according to the power generation power and the power consumption power, the power factor of the alternating current city grid is adjusted based on the reactive power, the reactive power of the whole circuit is calculated based on the actual operation working condition of the photovoltaic load and the photovoltaic cell panel, and then the power factor of the alternating current city grid is improved based on the reactive power, so that the energy loss caused by the reactive power is reduced, the technical problem of high energy waste of a photovoltaic system in the related technology is solved, the power factor of the power grid is improved, and the operation stability of the.
By taking electric equipment as an air conditioner compressor as an example, fig. 3 is a system topological diagram of the embodiment of the invention, and a solid line frame is a light storage (photovoltaic) air conditioning system and comprises a solar photovoltaic cell panel, an air conditioner compressor, a DC/AC machine side converter and an AC/DC network side converter. The solar photovoltaic panel is used for generating power by solar energy and is used by an AC/DC network side converter or a DC/AC machine side converter; the voltage regulating compressor is responsible for energy interaction with alternating current commercial power and a local load through an AC/DC network side converter, a three-phase alternating current photovoltaic air conditioning system is taken as an example for explanation, the single-phase alternating current photovoltaic air conditioning system has the same characteristics, the control method of the embodiment can be universal, the topological structure is shown in fig. 4, and fig. 4 is a circuit topological diagram of the air conditioning compressor in the embodiment of the invention. The DC/AC machine side converter is responsible for driving an air conditioner compressor to refrigerate, and the AC/DC network side converter is used for issuing an operation instruction of the photovoltaic air conditioner system by the upper control system, such as starting, shutting down, the refrigerating capacity, the generating capacity and the reactive power scheduling.
In one embodiment of this embodiment, calculating the reactive power of the grid-side converter from the generated power and the consumed power includes:
s11, calculating the actual active power of the grid-side converter according to the power consumption power and the power generation power;
under various working conditions, the actual active power is calculated in different manners, and as described in detail herein, calculating the actual active power of the grid-side converter according to the consumed power and the generated power includes: when the power consumption power is equal to the power generation power, determining that the actual active power is 0; when the generated power is 0, determining the power consumption power as the actual active power of the grid-side converter; when the power consumption power is 0, determining the generated power as the actual active power of the grid-side converter; when the generated power is greater than the consumed power, determining the difference value of the generated power and the consumed power as the actual active power of the grid-side converter; when the generated power is smaller than the consumed power, determining the difference value of the consumed power and the generated power as the actual active power of the grid-side converter; and when the power consumption power and the power generation power are both 0, determining that the actual active power is 0.
And S12, calculating the reactive power of the grid-side converter according to the actual active power and the apparent power of the grid-side converter.
Under different working conditions, the reactive power is calculated in different manners, and as described in detail herein, calculating the reactive power of the grid-side converter according to the actual active power and the apparent power of the grid-side converter includes: when the actual active power is 0, determining the apparent power as the reactive power of the grid-side converter; when the actual active power is the power consumption power, calculating the reactive power Qgird of the network side converter based on the following formula:
Figure BDA0002803789300000071
wherein Sgidd is apparent power, and Pgidd is actual active power; when the actual active power is the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000081
wherein Sgidd is apparent power, and Pgidd is actual active power; when the actual active power is the difference value between the generated power and the consumed power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000082
wherein Sgidd is apparent power, and Pgidd is actual active power; when the actual active power is the difference value between the consumed power and the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure BDA0002803789300000083
wherein Sgidd is apparent power, and Pgidd is actual active power.
In one example, the active power generated by the photovoltaic solar panel is Ppv; the power consumption active power of the DC/AC machine side converter and the air conditioner compressor (the DC/AC machine side converter and the air conditioner compressor form a photovoltaic load) is Pmotor; the total rated designed apparent power of the AC/DC network side converter is Sgidd, the actual active power of the AC/DC network side converter is Pgidd, the actual reactive power of the AC/DC network side converter is Qgidd, and the AC/DC network side converter is formed by the following steps of: sgird2＝Pgird2+Qgird2；
When the AC/DC grid-side converter actually has active power, based on the energy conservation law and 6 kinds of operation modes of the photovoltaic air conditioning system (before adding the reactive power function, qgidd ═ 0), the actually active power Pgird can be calculated in the following manner:
when the power generation active power of the photovoltaic solar panel is Ppv ═ DC/AC machine side converter and the power consumption active power of the air conditioner compressor is Pmotor, the AC/DC network side converter system is in a balanced state and does not generate or consume power, and the AC/DC network side converter Pgidrd is 0;
when the photovoltaic solar panel does not generate electricity, the active power Ppv is 0; therefore, the power consumption active power of the DC/AC machine side converter and the air conditioner compressor is Pmotor, the power consumption state of the AC/DC network side converter system is that Pmotor is Pgird of the AC/DC network side converter;
when the DC/AC machine side converter and the air conditioner compressor do not consume electricity, Pmotor is 0; therefore, the active power generated by the photovoltaic solar panel is Ppv, the AC/DC grid-side converter system is in a power generation state, and the AC/DC grid-side converter Pgird is Ppv;
when the photovoltaic solar panel generates electricity, the DC/AC machine side converter and the air conditioner compressor consume electricity; if the power generation active power Ppv of the photovoltaic solar panel is larger than the power consumption active power Pmotor of the DC/AC machine side converter and the air conditioner compressor, the AC/DC machine side converter is in a power generation state, and Pgidd is Ppv-Pmotor;
when the photovoltaic solar panel generates electricity, the DC/AC machine side converter and the air conditioner compressor consume electricity; if the power generation active power Ppv of the photovoltaic solar panel is less than the power consumption active power Pmotor of the DC/AC machine side converter and the air conditioner compressor, the AC/DC machine side converter is in a power consumption state, and Pmotor is Ppv + Pgird;
when the photovoltaic solar panel does not generate power, and the DC/AC machine side converter and the air conditioner compressor do not consume power, the whole photovoltaic air conditioning system is in a standby mode, and Pmotor Ppv Pgidd is 0.
For different operating modes, the reactive power can be calculated in the following manner:
when the power generation active power of the photovoltaic solar panel is Ppv ═ DC/AC machine side converter and the power consumption active power of the air conditioner compressor is Pmotor, the AC/DC network side converter system is in a balanced state and does not generate or consume power, and the AC/DC network side converter Pgidrd is 0; at this time, qgidd can be maximally Sgird;
when the photovoltaic solar panel does not generate electricity, the active power Ppv is 0; therefore, the power consumption active power of the DC/AC machine side converter and the air conditioner compressor is Pmotor, the power consumption state of the AC/DC network side converter system is that Pmotor is Pgird of the AC/DC network side converter; at this time, it is determined that,
Figure BDA0002803789300000091
Figure BDA0002803789300000092
when the DC/AC machine side converter and the air conditioner compressor do not consume electricity, Pmotor is 0; therefore, the active power generated by the photovoltaic solar panel is Ppv, the AC/DC grid-side converter system is in a power generation state, and the AC/DC grid-side converter Pgird is Ppv; at this time, it is determined that,
Figure BDA0002803789300000093
when the photovoltaic solar panel generates electricity, the DC/AC machine side converter and the air conditioner compressor consume electricity; if the power generation active power Ppv of the photovoltaic solar panel is larger than the power consumption active power Pmotor of the DC/AC machine side converter and the air conditioner compressor, the AC/DC machine side converter is in power generationStatus, Pgird ═ Ppv-Pmotor; at this time, it is determined that,
Figure BDA0002803789300000094
when the photovoltaic solar panel generates electricity, the DC/AC machine side converter and the air conditioner compressor consume electricity; if the photovoltaic solar panel generates active power Ppv<The DC/AC machine side converter and the air conditioner compressor consume power active power Pmotor, the AC/DC machine side converter is in a power consumption state, and Pmotor is Ppv + Pgird; at this time, it is determined that,
Figure BDA0002803789300000095
when the photovoltaic solar panel does not generate power, and the DC/AC machine side converter and the air conditioner compressor do not consume power, the whole photovoltaic air conditioning system is in a standby mode, wherein Pmotor Ppv Pgidd is 0; at this time, qgidd can be maximally Sgird;
in one embodiment of this embodiment, adjusting the power factor of the ac utility grid based on the reactive power includes: and issuing reactive power to a control loop of the grid-side converter so as to improve the power factor aiming at the photovoltaic load based on the reactive power of the AC city grid, wherein the control loop is connected with the AC city grid. Fig. 5 is a block diagram of a control loop of an embodiment of the present invention.
Fig. 6 is a control flow chart of reactive power of an embodiment of the present invention, including:
s61, the upper control system issues a reactive power scheduling command;
s62, the reactive power system controller collects and judges the power of each point;
s63, calculating parameters such as generating power, actual active power and power consumption power under various working conditions, including the following 6 working condition scenes: ppv ═ 0, Pmotor ═ Pgird; ppv ═ Pgird, Pmotor ═ 0; ppv < Pmotor, Pmotor ═ Ppv + Pgidd; ppv > Pmotor, Pgird ═ Ppv-Pmotor; ppv ═ Pmotor, Pgidd ═ 0; ppv ═ 0, Pmotor ═ 0;
s64, by formula
Figure BDA0002803789300000101
Calculating reactive power;
and S65, feeding back the available reactive capacity Qgird.
By adopting the scheme of the embodiment, the photovoltaic air-conditioning system is designed to have electric power and real-time electric power according to the rated design of the grid-side converter under 5 large operation working conditions by unified detection and scheduling communication and unified detection and scheduling communication of the reactive power system controller, receives scheduling of an upper control system, outputs or inputs reactive power, improves the power factor of a power grid and improves the operation stability of the system; by the control method for increasing the reactive power to the photovoltaic air-conditioning system, the functional characteristic that the photovoltaic air-conditioning system outputs the reactive power in real time is realized, and the problem of energy waste caused by the fact that the photovoltaic air-conditioning system is in an idle state under the condition that refrigeration is not needed at night or the photovoltaic power generation power is very low and the refrigeration power is very low is solved; the functions of the photovoltaic air conditioning system are increased, and the photovoltaic air conditioning system can be applied to more occasions.
Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
In this embodiment, a reactive power control device and a reactive power control system are further provided, which are used to implement the foregoing embodiments and preferred embodiments, and are not described again after being described. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The embodiment provides a control device of reactive power, fig. 7 is a block diagram of a structure of a control device of reactive power according to an embodiment of the present invention, the device includes: an acquisition module 70, a calculation module 72, an adjustment module 74, wherein,
an obtaining module 70, configured to obtain power generated by a photovoltaic panel, and obtain power consumed by a photovoltaic load, where the photovoltaic load includes a power-consuming device and a machine side converter, and the machine side converter is connected between the photovoltaic panel and the power-consuming device;
a calculating module 72, configured to calculate reactive power of a grid-side converter according to the generated power and the consumed power, where the grid-side converter is connected between the machine-side converter and an ac utility grid;
and an adjusting module 74, configured to adjust a power factor of the ac main based on the reactive power.
Optionally, the calculation module includes: the first calculating unit is used for calculating the actual active power of the grid-side converter according to the power consumption power and the power generation power; and the second calculating unit is used for calculating the reactive power of the grid side converter according to the actual active power and the apparent power of the grid side converter.
Optionally, the first computing unit includes: a first calculating subunit, configured to determine that the actual active power is 0 when the consumed power and the generated power are equal to each other; the second calculating subunit is used for determining the power consumption power as the actual active power of the grid-side converter when the generated power is 0; a third calculating subunit, configured to determine the generated power as an actual active power of the grid-side converter when the power consumption power is 0; the fourth calculating subunit is configured to determine, when the generated power is greater than the consumed power, a difference between the generated power and the consumed power as an actual active power of the grid-side converter; a fifth calculating subunit, configured to determine, when the generated power is smaller than the consumed power, a difference between the consumed power and the generated power as an actual active power of the grid-side converter; and the sixth calculating subunit is configured to determine that the actual active power is 0 when both the power consumption power and the power generation power are 0.
Optionally, the second calculating unit includes: a first calculating subunit, configured to determine the apparent power as a reactive power of the grid-side converter when the actual active power is 0; a second calculating subunit, configured to calculate, when the actual active power is the consumed power, a reactive power of the grid-side converter based on the following formula
Figure BDA0002803789300000121
Wherein Sgidd is the apparent power, and Pgidd is the actual active power; a third calculating subunit, configured to calculate a reactive power qgidd of the grid-side converter based on the following formula when the actual active power is the generated power:
Figure BDA0002803789300000122
wherein Sgidd is the apparent power, and Pgidd is the actual active power; a fourth calculating subunit, configured to calculate a reactive power qgidd of the grid-side converter based on the following formula when the actual active power is a difference between the generated power and the consumed power:
Figure BDA0002803789300000123
wherein Sgidd is the apparent power, and Pgidd is the actual active power; a fifth calculating subunit, configured to calculate a reactive power Qgird of the grid-side converter based on the following formula when the actual active power is a difference between the consumed power and the generated power:
Figure BDA0002803789300000124
wherein Sgidd is the apparent power, and Pgidd is the actual active power.
Optionally, the adjusting module includes: and the issuing unit is used for issuing the reactive power to a control loop of the grid-side converter so as to enable the AC mains network to improve the power factor aiming at the photovoltaic load based on the reactive power, wherein the control loop is connected with the AC mains network.
Optionally, the machine side converter is a DC/AC machine side converter, and the grid side converter is an AC/DC grid side converter.
The present embodiment also provides a reactive power control system, which provides a reactive power control system, including: the system comprises a photovoltaic system, a reactive power controller and an AC city network, wherein the reactive power controller is connected with the photovoltaic system and the AC city network and comprises the device described in the embodiment; the photovoltaic system comprises a photovoltaic cell panel, a photovoltaic load and a grid side converter, wherein the grid side converter is connected into the AC city grid, and the photovoltaic load comprises electric equipment and a machine side converter.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 3
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in an aspect of the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
s1, acquiring the generated power of a photovoltaic cell panel and acquiring the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment;
s2, calculating reactive power of a network side converter according to the generated power and the consumed power, wherein the network side converter is connected between the machine side converter and an AC city network;
and S3, adjusting the power factor of the AC city grid based on the reactive power.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in an aspect of this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, acquiring the generated power of a photovoltaic cell panel and acquiring the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment;
s2, calculating reactive power of a network side converter according to the generated power and the consumed power, wherein the network side converter is connected between the machine side converter and an AC city network;
and S3, adjusting the power factor of the AC city grid based on the reactive power.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method of controlling reactive power, comprising:
the method comprises the steps of obtaining the power generation power of a photovoltaic cell panel and obtaining the power consumption power of a photovoltaic load, wherein the photovoltaic load comprises electric equipment and a machine side converter, and the machine side converter is connected between the photovoltaic cell panel and the electric equipment;
calculating reactive power of a grid side converter according to the generated power and the consumed power, wherein the grid side converter is connected between the machine side converter and an AC city grid;
and adjusting the power factor of the AC city grid based on the reactive power.
2. The method of claim 1, wherein calculating reactive power of a grid-side converter from the generated power and the consumed power comprises:
calculating the actual active power of the grid-side converter according to the power consumption power and the power generation power;
and calculating the reactive power of the grid-side converter according to the actual active power and the apparent power of the grid-side converter.
3. The method of claim 2, wherein calculating the actual active power of the grid-side converter from the consumed power and the generated power comprises:
when the power consumption power is equal to the power generation power, determining that the actual active power is 0;
when the generated power is 0, determining the consumed power as the actual active power of the grid-side converter;
when the power consumption power is 0, determining the generated power as the actual active power of the grid-side converter;
when the generated power is greater than the consumed power, determining a difference value between the generated power and the consumed power as an actual active power of the grid-side converter;
when the generated power is smaller than the consumed power, determining a difference value between the consumed power and the generated power as an actual active power of the grid-side converter;
and when the power consumption power and the power generation power are both 0, determining that the actual active power is 0.
4. The method of claim 2, wherein calculating the reactive power of the grid-side converter from the actual active power and the apparent power of the grid-side converter comprises:
when the actual active power is 0, determining the apparent power as the reactive power of the grid-side converter;
when the actual active power is the power consumption power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure FDA0002803789290000021
wherein Sgidd is the apparent power, and Pgidd is the actual active power;
when the actual active power is the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure FDA0002803789290000022
wherein Sgidd is the apparent power, and Pgidd is the actual active power;
when the actual active power is the difference value between the generated power and the consumed power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure FDA0002803789290000023
Figure FDA0002803789290000024
wherein Sgidd is the apparent power, and Pgidd is the actual active power;
when the actual active power is the difference value between the consumed power and the generated power, calculating the reactive power Qgird of the grid-side converter based on the following formula:
Figure FDA0002803789290000025
Figure FDA0002803789290000026
wherein Sgidd is the apparent power, and Pgidd is the actual active power.
5. The method of claim 1, wherein adjusting the power factor of the AC utility grid based on the reactive power comprises:
and issuing the reactive power to a control loop of the grid-side converter so that the AC main grid improves the power factor aiming at the photovoltaic load based on the reactive power, wherein the control loop is connected with the AC main grid.
6. A method according to claim 1, characterized in that the machine side converter is a DC/AC machine side converter and the network side converter is an AC/DC network side converter.
7. A reactive power control apparatus, comprising:
the photovoltaic load comprises electric equipment and a machine side converter, wherein the machine side converter is connected between the photovoltaic cell panel and the electric equipment;
the calculating module is used for calculating reactive power of a network side converter according to the generated power and the consumed power, wherein the network side converter is connected between the machine side converter and an AC city network;
and the adjusting module is used for adjusting the power factor of the AC city grid based on the reactive power.
8. A reactive power control system, comprising: a photovoltaic system, a reactive power controller, an AC utility grid, wherein,
the reactive power controller, connected to the photovoltaic system and the utility grid, comprising the apparatus of claim 7;
the photovoltaic system comprises a photovoltaic cell panel, a photovoltaic load and a grid side converter, wherein the grid side converter is connected into the AC city grid, and the photovoltaic load comprises electric equipment and a machine side converter.
9. A storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 6 when executed.
10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 6.
CN202011360201.4A 2020-11-27 2020-11-27 Reactive power control method, device and system, storage medium and electronic device Pending CN112531772A (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN104113078A (en) * 2014-07-03 2014-10-22 珠海格力电器股份有限公司 Photovoltaic direct drive system and control method thereof
US20170040887A1 (en) * 2015-08-03 2017-02-09 Abb Schweiz Ag Dc/ac converter apparatus comprising means for controlling the reactive power and power conversion and generation system comprising such dc/ac converter apparatus
WO2017097049A1 (en) * 2015-12-08 2017-06-15 珠海格力电器股份有限公司 Method and apparatus for inputting current into air conditioning unit
CN110635511A (en) * 2019-10-24 2019-12-31 湖南大学 Photovoltaic energy storage hybrid system and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104113078A (en) * 2014-07-03 2014-10-22 珠海格力电器股份有限公司 Photovoltaic direct drive system and control method thereof
US20170040887A1 (en) * 2015-08-03 2017-02-09 Abb Schweiz Ag Dc/ac converter apparatus comprising means for controlling the reactive power and power conversion and generation system comprising such dc/ac converter apparatus
WO2017097049A1 (en) * 2015-12-08 2017-06-15 珠海格力电器股份有限公司 Method and apparatus for inputting current into air conditioning unit
CN110635511A (en) * 2019-10-24 2019-12-31 湖南大学 Photovoltaic energy storage hybrid system and control method thereof

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