CN112436546A - Distributed mixed storage electric energy quality adjusting device and integrated cloud control platform thereof - Google Patents

Distributed mixed storage electric energy quality adjusting device and integrated cloud control platform thereof Download PDF

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Publication number
CN112436546A
CN112436546A CN202011268238.4A CN202011268238A CN112436546A CN 112436546 A CN112436546 A CN 112436546A CN 202011268238 A CN202011268238 A CN 202011268238A CN 112436546 A CN112436546 A CN 112436546A
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output end
converter
quality adjusting
grid
inverter
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王捷
陆扬
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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
    • 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
    • H02J13/00001—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 display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J13/00002—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 monitoring
    • 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
    • H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
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    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
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    • 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
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    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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    • Y02E40/30—Reactive power compensation
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    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract

The invention discloses a distributed mixed storage electric energy quality adjusting device and an integrated cloud control platform thereof. The distributed mixed storage power quality adjusting device has the advantages of a common distributed power grid energy storage device and a light storage integrated device, and has the functions of reactive compensation, harmonic suppression and voltage support; the distributed mixed storage electric energy quality adjusting devices are combined to be used as a centralized mixed storage electric energy quality adjusting device to be controlled and operated through the integrated cloud control platform, meanwhile, the platform can adjust the tide of each branch according to different branch load conditions, the distributed mixed storage electric energy quality adjusting devices on the intelligent control branch can reason and solve complex faults, and therefore optimal control of energy is achieved.

Description

Distributed mixed storage electric energy quality adjusting device and integrated cloud control platform thereof
Technical Field
The invention belongs to the technical field of smart power grids, and particularly relates to a distributed hybrid storage power quality adjusting device and an integrated cloud control platform thereof.
Background
In the face of the increasing energy demand and the huge challenges of global energy conservation and emission reduction, the vigorous development of the power grid energy storage technology becomes a necessary choice, and is also the development trend of the intelligent power distribution network.
At present, the conventional centralized energy storage device has large energy storage capacity, but the prior investment is large, the cost recovery period is long, the occupied area is large, and the later maintenance cost is too high. The general distributed power grid energy storage device occupies a small area and has small early investment, but has a single function, can only simply meet the basic requirements of users on time-of-use electricity price and peak clipping and valley filling, does not have the functions of reactive compensation, harmonic suppression and the like, and cannot intelligently adjust the power flow of a power grid according to the load condition.
At present, although an existing distributed light storage integrated device can realize the functions of peak clipping and valley filling while utilizing photovoltaic power generation, the device lacks a unified scheduling system, although an individual device has an industrial monitoring cloud platform, the platform can only realize a simple data collection monitoring function, the power consumption of a power grid cannot be estimated, the bus tide cannot be intelligently scheduled and controlled, the photovoltaic advantage cannot be utilized to the maximum extent, and further energy waste is caused.
The existing uninterrupted voltage device, such as UPS/DVR, provides uninterrupted power supply for the power grid, and needs full-capacity redundancy backup, so that the equipment cost is high, the occupied area is large, and the energy utilization rate is low. To this problem, although voltage compensation devices that take electricity through self-electricity or another independent bus appear on the market, such devices cannot guarantee the quality of electric energy of the electricity-taking side of the devices, that is, the electricity-taking side may also have a voltage interruption problem, which brings great power utilization hidden trouble to user loads, especially voltage sensitive devices.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the invention provides a distributed hybrid storage power quality adjusting device and an integrated cloud control platform thereof.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the distributed mixed storage power quality adjusting device comprises a primary energy storage device and a bidirectional DC/DC converter thereof, a secondary energy storage device and a bidirectional DC/DC converter thereof, a photovoltaic cell panel and a unidirectional DC/DC converter thereof, a first DC/AC inverter and a grid-connected device thereof, and a second DC/AC inverter and a grid-connected device thereof; the output end of the primary energy storage device is connected with the input end of a bidirectional DC/DC converter of the primary energy storage device, and the output end of the bidirectional DC/DC converter is connected with a direct current bus; the output end of the two-stage energy storage device is connected with the input end of the two-way DC/DC converter, and the output end of the two-way DC/DC converter is connected with the direct current bus; the output end of the photovoltaic cell panel is connected with the input end of the unidirectional DC/DC converter of the photovoltaic cell panel, and the output end of the unidirectional DC/DC converter is connected with the direct current bus; the output end of the first DC/AC inverter is connected with the input end of a grid-connected device of the first DC/AC inverter, and the output end of the grid-connected device is connected with a first power grid; the output end of the second DC/AC inverter is connected with the input end of a grid-connected device of the second DC/AC inverter, and the output end of the grid-connected device is connected with a second power grid; the first DC/AC inverter device is directly connected with the DC side of the second DC/AC inverter device.
The integrated cloud control platform based on the distributed hybrid power storage quality adjusting devices comprises a cloud server, the integrated cloud control platform runs in the cloud server, monitors data uploaded by each distributed hybrid power storage quality adjusting device in real time through a background program, performs decoding conversion on the data uploaded by each distributed hybrid power storage quality adjusting device, judges whether running data or fault state is reported according to the data type, displays the running state at the front end of the platform in real time if the running data is the running data, and performs corresponding optimized scheduling control according to the running condition of each bus; if the fault state is reported, firstly loading fault information, then searching in a fault processing case base which is imported by professional engineers in advance, reusing a coping strategy if the same fault case exists, if the same fault case does not exist, reasoning and correcting the searched maximum similar fault case, recording the success and failure of the correction strategy in the case base, if the strategy fails, alarming to related engineers, requesting the professional engineers to perform strategy correction, then reloading the case base, waiting for the next similar fault to be called, and sorting the similar redundant cases in the case base.
Adopt the beneficial effect that above-mentioned technical scheme brought:
1. the distributed mixed storage power quality adjusting device not only can realize the basic functions of peak clipping and valley filling of the conventional distributed energy storage device, but also has the functions of reactive power compensation and harmonic suppression; meanwhile, the operation condition of the device is monitored in real time by combining an integrated cloud control platform, the power utilization condition of each bus load is recorded, the photovoltaic energy utilization efficiency is improved, the power consumption of the device from a power grid is reduced as far as possible, and more economic benefits are brought to users.
2. The distributed mixed storage power quality adjusting device can be used as a centralized energy storage device by combining with the integrated cloud control platform, but the single distributed device has small occupied area, does not need to expand a field in a power distribution room, and has small early investment, quick cost recovery and low maintenance cost.
3. Compared with the traditional UPS/DVR device, the distributed mixed storage power quality adjusting device does not need full capacity backup, and utilizes multiple modes of photovoltaic power generation, two-stage energy storage devices and power-taking buses to carry out energy backup, so that the hidden danger that the device cannot carry out voltage support due to the failure of the power-taking buses is thoroughly eliminated, the robustness of the whole device is improved, and the size and the cost of the conventional backup energy device are reduced.
4. The integrated cloud control platform can monitor the bus state of each device in real time, perform targeted energy storage, reactive compensation, harmonic suppression or voltage support operation on the operation condition of each bus, dynamically balance power flows of different buses, optimize energy flow of an electric power system, guarantee voltage quality of the electric power system and improve stability of the electric power system.
5. The integrated cloud control platform not only realizes the function of collecting and detecting the data of the conventional cloud platform, but also analyzes and infers the faults uploaded by the current device according to the pre-stored conventional fault processing cases, gives an optimal fault solving strategy, performs complex calculation and decision cloud processing, completes simple fault processing and instruction calculation by the sub-device, improves the operation robustness of the device and reduces the calculation pressure of the distributed sub-device.
Drawings
FIG. 1 is a topological structure diagram of a distributed hybrid power storage quality adjusting device according to the present invention;
FIG. 2 is a control schematic diagram of the distributed hybrid storage power quality adjusting device according to the present invention;
FIG. 3 is a flow chart of the operation of the integrated cloud control platform according to the present invention;
fig. 4 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention designs a distributed mixed storage power quality adjusting device, which comprises a primary energy storage device and a bidirectional DC/DC converter thereof, a secondary energy storage device and a bidirectional DC/DC converter thereof, a photovoltaic cell panel and a unidirectional DC/DC converter thereof, a first DC/AC inverter and a grid-connected device thereof, and a second DC/AC inverter and a grid-connected device thereof, as shown in figure 1. The output end of the primary energy storage device is connected with the input end of the bidirectional DC/DC converter, and the output end of the bidirectional DC/DC converter is connected with the direct current bus. The output end of the two-stage energy storage device is connected with the input end of the bidirectional DC/DC converter, and the output end of the bidirectional DC/DC converter is connected with the direct current bus. The output end of the photovoltaic cell panel is connected with the input end of the unidirectional DC/DC converter, and the output end of the unidirectional DC/DC converter is connected with the direct current bus. The output end of the first DC/AC inverter is connected with the input end of a grid-connected device of the first DC/AC inverter, and the output end of the grid-connected device is connected with a first power grid. The output end of the second DC/AC inverter is connected with the input end of the grid-connected device, the output end of the grid-connected device is connected with a second power grid, and the first DC/AC inverter is directly connected with the direct current side of the second DC/AC inverter.
The low-voltage direct current of the two-stage energy storage device is converted into high-voltage direct current on the direct-current bus through the DC/DC converter, the low-voltage direct current generated by the photovoltaic cell panel is also converted into high-voltage direct current on the direct-current bus through the DC/DC converter, and the three maintain the stability of the voltage of the direct-current bus. The DC/AC inversion device inverts the voltage of the direct-current bus into alternating current, and the treatment of the power quality problem or the optimized dispatching operation of energy is carried out on the corresponding bus.
The distributed mixed storage power quality adjusting device is internally provided with a control system, a control schematic diagram of the device is shown in fig. 2, a power supply unit provides power supply support for other functional units, a sampling unit is used for collecting line state parameters, a core computing control unit is used for computing simple instructions and generating basic fault protection instructions, a driving unit is used for receiving instructions of the core computing control unit and driving all components in the device according to the instructions, a communication unit is used for connecting the device with an integrated cloud control platform in a communication mode, and a direct-current bus control unit is used for monitoring the running state of a direct-current bus and maintaining the voltage stability of the direct-current bus.
The invention also designs an integrated cloud control platform in combination with the distributed hybrid power storage quality adjusting device, as shown in fig. 3, the integrated cloud control platform comprises a cloud server, the integrated cloud control platform operates in the cloud server, monitors data uploaded by each distributed hybrid power storage quality adjusting device in real time through a background program, performs decoding conversion on the data uploaded by each distributed hybrid power storage quality adjusting device, judges whether the data is operation data or fault state report according to the data type, displays the operation state at the front end of the platform in real time if the data is operation data, and performs corresponding optimized scheduling control according to the operation condition of each bus; if the fault state is reported, firstly loading fault information, then searching in a fault processing case base which is imported by professional engineers in advance, reusing a coping strategy if the same fault case exists, if the same fault case does not exist, reasoning and correcting the searched maximum similar fault case, recording the success and failure of the correction strategy in the case base, if the strategy fails, alarming to related engineers, requesting the professional engineers to perform strategy correction, then reloading the case base, waiting for the next similar fault to be called, and sorting the similar redundant cases in the case base to improve the subsequent searching efficiency of the case base.
Fig. 4 is an application structure diagram of the distributed hybrid power storage quality adjusting device and the integrated cloud control platform thereof provided in this embodiment, and includes primary ac buses 1, 2, and 3, secondary ac buses 4, 5, and 6, transformers 7, 8, and 9, distributed hybrid power storage quality adjusting devices 13 and 14, secondary user loads 10, 11, and 12, and an integrated cloud control platform 15. The distributed hybrid storage power quality adjusting device is connected in parallel to two different secondary buses, and can flexibly operate according to different user load characteristics on different buses (taking a user load 10 as a nonlinear load, a user load 11 as a reactive load, and a user load 12 with unbalanced three phases as an example).
The distributed mixed storage power quality adjusting devices 13 and 14 respectively detect the running conditions of the alternating current buses, and the device 13 generates a harmonic compensation command through an internal core calculation control unit to enable the device to dynamically compensate the harmonic current of the secondary alternating current bus 4. The device 14 generates reactive current and three-phase imbalance compensation commands via the internal control unit to enable the device to dynamically compensate the reactive current of the secondary ac bus 5 while suppressing three-phase imbalance of the secondary ac bus 6, respectively. Compared with the traditional centralized compensation, the distributed compensation is more flexible, the bus electric energy quality can be better improved, and the operation stability of a power grid is improved.
When various faults occur to buses at all levels, the device can quickly detect an abnormal operation state, if the faults are simple, the sub-devices automatically process the faults, and if the faults are complex computing or decision-making, the faults are uploaded to the integrated cloud control platform to request the cloud platform to make decision processing. The following description will be given by taking an example in which the secondary ac bus 4 is lost and the secondary ac bus 5 is loaded with a heavy load.
When the secondary alternating-current bus 4 is in fault and power loss, and the bus voltage is reduced due to the fact that the secondary alternating-current bus 5 is in heavy load input, the devices 13 and 14 can rapidly detect the abnormal conditions of the secondary alternating-current buses 4 and 5 and upload cloud fault information. When the integrated cloud control platform receives fault information, whether the same case strategy exists or not is firstly searched, the bus power-off strategy and the heavy-load switching strategy are reused after the bus power-off strategy and the heavy-load switching strategy are searched, cases are corrected according to the normal operation state of the existing secondary alternating-current bus 6, the correction strategy is used for rapidly making up a power gap of the secondary alternating-current bus 5 for the device 14, and the missing power is provided for the secondary alternating-current bus 5 according to the sequence of photovoltaic priority, secondary energy storage time and power taking from the secondary alternating-current bus 6 so as to maintain the power balance of the secondary alternating-current bus 5. Meanwhile, the device 13 provides voltage support according to the power requirement of the secondary alternating-current bus 4, the direct-current side power taking sequence is the same as that of the device 14, the power failure time of the secondary alternating-current bus 4 is shortened as far as possible, and the power failure loss of users is reduced. And the integrated cloud control platform sends corresponding control instructions to the two devices, if the mother secondary alternating current buses 4 and 5 are recovered to be normal, the successful application case is recorded, whether the case base has similar redundant cases or not is searched, if yes, the case base and the case base are combined and corrected and then stored again, and if not, the decision process is ended.
Viewed from the bottom layer, the distributed mixed storage power quality adjusting device has the advantages of a common distributed power grid energy storage device and light storage integrated device, and has the functions of reactive compensation, harmonic suppression and voltage support; from the top, the integrated cloud control platform combines all the distributed mixed storage electric energy quality adjusting devices to be used as a centralized mixed storage electric energy quality adjusting device for controlling operation, and meanwhile, the platform can intelligently control the distributed mixed storage electric energy quality adjusting devices on the branches to adjust the power flow of each branch according to different branch load conditions, so that the complex faults are reasoned and solved, and the optimal control of energy is achieved.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.

Claims (2)

1. Distributed mixed storage electric energy quality adjusting device, its characterized in that: the photovoltaic solar energy storage system comprises a primary energy storage device and a bidirectional DC/DC converter thereof, a secondary energy storage device and a bidirectional DC/DC converter thereof, a photovoltaic cell panel and a unidirectional DC/DC converter thereof, a first DC/AC inverter and a grid-connected device thereof, and a second DC/AC inverter and a grid-connected device thereof; the output end of the primary energy storage device is connected with the input end of a bidirectional DC/DC converter of the primary energy storage device, and the output end of the bidirectional DC/DC converter is connected with a direct current bus; the output end of the two-stage energy storage device is connected with the input end of the two-way DC/DC converter, and the output end of the two-way DC/DC converter is connected with the direct current bus; the output end of the photovoltaic cell panel is connected with the input end of the unidirectional DC/DC converter of the photovoltaic cell panel, and the output end of the unidirectional DC/DC converter is connected with the direct current bus; the output end of the first DC/AC inverter is connected with the input end of a grid-connected device of the first DC/AC inverter, and the output end of the grid-connected device is connected with a first power grid; the output end of the second DC/AC inverter is connected with the input end of a grid-connected device of the second DC/AC inverter, and the output end of the grid-connected device is connected with a second power grid; the first DC/AC inverter device is directly connected with the DC side of the second DC/AC inverter device.
2. The integrated cloud control platform based on the distributed hybrid power storage quality adjusting device of claim 1, characterized in that: the integrated cloud control platform runs in the cloud server, monitors data uploaded by each distributed hybrid storage power quality adjusting device in real time through a background program, performs decoding conversion on the data uploaded by each distributed hybrid storage power quality adjusting device, judges whether running data or fault state is reported according to the data type, displays the running state at the front end of the platform in real time if the running data is the running data, and performs corresponding optimized scheduling control according to the running condition of each bus; if the fault state is reported, firstly loading fault information, then searching in a fault processing case base which is imported by professional engineers in advance, reusing a coping strategy if the same fault case exists, if the same fault case does not exist, reasoning and correcting the searched maximum similar fault case, recording the success and failure of the correction strategy in the case base, if the strategy fails, alarming to related engineers, requesting the professional engineers to perform strategy correction, then reloading the case base, waiting for the next similar fault to be called, and sorting the similar redundant cases in the case base.
CN202011268238.4A 2020-11-13 2020-11-13 Distributed mixed storage electric energy quality adjusting device and integrated cloud control platform thereof Withdrawn CN112436546A (en)

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CN104571099A (en) * 2015-01-26 2015-04-29 北京国能日新系统控制技术有限公司 Photovoltaic fault diagnosis system and method based on theoretical calculation and data analysis
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