CN113708381A - Distributed reactive compensation control system for improving network loss - Google Patents

Distributed reactive compensation control system for improving network loss Download PDF

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Publication number
CN113708381A
CN113708381A CN202110791233.8A CN202110791233A CN113708381A CN 113708381 A CN113708381 A CN 113708381A CN 202110791233 A CN202110791233 A CN 202110791233A CN 113708381 A CN113708381 A CN 113708381A
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reactive
distributed
distribution network
voltage
compensation device
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Inventor
吴昌
陈韶昱
孙维真
倪秋龙
石博隆
沈绍斐
何建明
程小飙
徐彬
周起明
周慧忠
谢永胜
李震
徐艺
杨庆赟
方坚
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Zhejiang Huibo Electric Power Equipment Manufacturing Co ltd
Quzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Zhejiang Huibo Electric Power Equipment Manufacturing Co ltd
Quzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Priority to CN202110791233.8A priority Critical patent/CN113708381A/en
Publication of CN113708381A publication Critical patent/CN113708381A/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
    • H02J3/18—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
    • 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
    • H02J13/00022—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 using wireless data transmission
    • 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
    • H02J13/00022—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 using wireless data transmission
    • H02J13/00026—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 using wireless data transmission involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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]
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
    • 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
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    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention provides a distributed reactive compensation control system for improving network loss, which comprises a plurality of distributed reactive compensation devices and a distribution network master station, wherein the distributed reactive compensation devices are distributed in distribution network nodes, the distribution network master station is in communication connection with the distributed reactive compensation devices, the distributed reactive compensation devices are used for acquiring reactive voltage state data of corresponding nodes and feeding the voltage reactive state data back to the distribution network master station, the distribution network master station is provided with a network loss optimization algorithm, receives the voltage reactive state data fed back by all the distributed reactive compensation devices, calculates and outputs reactive voltage control parameters corresponding to all the nodes through the network loss optimization algorithm, and regulates and controls the reactive voltage of the corresponding nodes according to the reactive voltage control parameters. The invention realizes the sensing of the voltage reactive power around the distributed compensation device through the distributed compensation device, and realizes the real-time interaction with the cooperative control of the distribution network main station system to realize the effective control of the reactive voltage containing the distributed reactive compensation device.

Description

Distributed reactive compensation control system for improving network loss
Technical Field
The invention relates to the technical field of reactive compensation, in particular to a distributed reactive compensation control system for improving network loss.
Background
Along with the high-speed development of the economic society, regional business is prosperous, resident lives are rich, household appliances of residents are configured and developed towards a saturation level, the cooling and heating of business places and the configuration and acceleration of power electric appliances are in a high position, the power consumption load peak and valley of a power distribution network are large, diversification, power electronization and other characteristics are obvious, a large number of distributed power supplies and the like are connected to the power distribution network under the development of national new infrastructure and energy internet, and the new infrastructure enables charging piles to be connected to the power distribution network to be increased rapidly. The characteristics of large peak valley, diversification and power electronization of the power load of the power distribution network in the form of the energy internet can be expected to be more remarkable, and the requirements on the power quality regulation capacity and the load control capacity of the power distribution network are higher and higher.
The voltage quality of a 10kV distribution network is an important technical index for judging whether the power supply quality meets the standard or not, and the quality of the voltage quality is directly related to the safe and economic operation of electric equipment and the normal operation of production. Line loss is an important economic index for measuring a power grid company, and the saved electric energy is the cleanest energy. With the development of society, the requirements of power grid companies and power consumers on the voltage quality are gradually improved; the demand of society and country for unit GDP energy consumption is increasing day by day. According to statistics, the line loss rate of the current 10kV distribution network is about 2.3%, the line loss rate of a part of long-distance 10kV power supply lines can reach more than 10%, and if the power supply radius is further increased in a line series supply mode, the problems of heavy loss and low voltage are more prominent. In addition, in recent years, with the fact that a large number of distributed photovoltaic networks are connected to a 10kV power distribution network, the problem of high voltage still occurs under the conditions of strong sunlight and light load, and the problem of high voltage often occurs in the seasons of rich water due to the fact that a plurality of small hydropower stations are distributed on part of 10kV power distribution lines.
The distributed photovoltaic inverter has fast and continuous reactive power regulation capability, and is one of important reactive power sources in an electric power system. Meanwhile, if a controllable series compensation device and a controllable parallel compensation device are additionally arranged on the line, the reactance of the line can be adjusted. The reactive voltage regulation means are incorporated into regional reactive voltage control of the power distribution network, so that the reactive voltage regulation capability of the power distribution network is enhanced, and the safety and the economy of power grid operation are improved. Once the distributed photovoltaic is brought into the reactive voltage coordination control of the power distribution network, system monitoring personnel can monitor the reactive voltage condition on the line in real time and automatically control the reactive voltage condition, can optimize the distributed photovoltaic reactive power output or adjust the line reactance on line according to the requirement, adjust the bus voltage of a grid-connected point and reduce the line loss.
The existing voltage control technology of 10kV lines distributed at home and abroad has centralized cooperative control and decentralized autonomous control, and both the two modes have certain advantages and disadvantages. The centralized control can give full play to the advantage of optimizing and adjusting the whole line, but the requirement on communication is higher, the installation places of the existing distributed compensation devices are scattered, most remote areas are far away from a power distribution network master station, the communication conditions are usually severe, and the problems of difficult communication and long network delay of the power distribution network generally exist; although pure local control does not depend on communication, has the advantages of small control calculation amount and the like, the traditional local control strategy usually does not consider the coordination control of the whole line and cannot fully utilize the adjusting capacity of each compensating device. In practical engineering application, a power distribution network in a mountain area generally has the defects of aged facilities, multiple and non-standard lead types, longer lines, smaller line diameters, more distribution transformers, even more lines with a plurality of large-capacity motors or rapidly-changing industrial loads, which often causes serious fluctuation of voltage at the tail ends of the lines and large loss of the lines.
Disclosure of Invention
The invention solves the problems of voltage fluctuation and high line loss caused by heavy load of a long line, and provides a distributed reactive compensation control system for improving network loss.
In order to realize the purpose, the following technical scheme is provided:
the utility model provides an improve distributed reactive compensation control system of net loss, includes distributed reactive compensation device and the distribution network main website of a plurality of distribution installations in the distribution network node, distribution network main website and distributed reactive compensation device communication connection, distributed reactive compensation device is used for acquireing its reactive voltage state data that corresponds the node to with voltage reactive state data feedback to the distribution network main website, the distribution network main website is equipped with net loss optimal algorithm, receives the voltage reactive state data of all distributed reactive compensation device feedbacks, calculates the reactive voltage control parameter that all nodes of output correspond through net loss optimal algorithm, distributed reactive compensation device regulates and control its reactive voltage that corresponds the node according to the reactive voltage control parameter.
The invention completes the reactive power optimization control of the power distribution network in a mode of centralized optimization of the control master station, wherein the functions of the compensation node comprise local data acquisition, real-time calculation of local regulation capacity, coordination of data wireless communication uploading, receiving of real-time instructions and instruction issuing to controllable equipment in the node range to complete local regulation and control. When the reactive power optimization control of the long-line heavy-load power distribution network is realized, the distributed compensation node design based on the line load characteristics is adopted, the compensation node functions comprise data acquisition analysis, calculation, communication, regulation and control of related equipment and the like of the corresponding device location, and the control master station realizes the reactive power voltage optimization control of the whole line through comprehensive coordination optimization.
Preferably, the distributed reactive power compensation device comprises a parallel capacitor intelligent compensation device and a series capacitor intelligent compensation device. And the distribution nodes and the capacities of the parallel capacitor intelligent compensation device and the series capacitor intelligent compensation device are determined after optimization algorithm optimization according to the line parameters and the load parameters of the power distribution network.
Preferably, the distribution network main station is further connected with a photovoltaic power station and a public distribution transformer with SVG.
The intelligent compensation device of the parallel capacitor, the intelligent compensation device of the series capacitor, the photovoltaic power station and the public distribution transformer with the SVG are used as reactive power sources to communicate with a distribution network master station for information interaction.
Preferably, the communication mode between the distribution network main station and the distributed reactive power compensation device is wired communication.
Preferably, the communication mode between the distribution network main station and the distributed reactive power compensation device is 4G or 5G wireless communication.
Preferably, the network loss optimization algorithm includes a network loss target minimum function:
Figure BDA0003161156430000031
wherein, PLossFor line losses in the grid, N is the number of nodes in the grid, Ii，RIs the current flowing through the i node, Ri，LIs the equivalent resistance of the i node in the power grid.
Preferably, the distribution network further comprises the following constraints: power balance constraint is used for meeting power grid tide flow balance;
node voltage constraint:
Figure BDA0003161156430000032
wherein Vi min，Vi maxMinimum and maximum voltage amplitude limits, respectively;
and node reactive power output constraint:
Figure BDA0003161156430000041
wherein QG,iRepresenting a real-time reactive output of the reactive power compensation device;
Figure BDA0003161156430000042
and
Figure BDA0003161156430000043
representing the real-time regulation capacity of the distributed reactive power compensation device i, calculating and uploading the real-time regulation capacity by the reactive power compensation device node, and collecting Q by the distributed reactive power compensation device to ensure the consistency and synchronization of dataG,iThe data are also uploaded to a power distribution network master station;
capacitive reactance device constraint:
Figure BDA0003161156430000044
wherein:
Figure BDA0003161156430000045
and
Figure BDA0003161156430000046
then represents the real-time tuning range of the capacitive reactance device i;
restraint of the adjustable transformer device:
Figure BDA0003161156430000047
wherein
Figure BDA0003161156430000048
And
Figure BDA0003161156430000049
it represents the real-time regulation range of the adjustable transformer means i.
The invention has the beneficial effects that: when the reactive power optimization control of the long-line heavy-load power distribution network is realized, the distributed compensation node design based on the line load characteristics is adopted, the compensation node functions comprise data acquisition analysis, calculation, communication, regulation and control of related equipment and the like of the corresponding device location, and the control master station realizes the reactive power voltage optimization control of the whole line through comprehensive coordination optimization.
Drawings
Fig. 1 is a hardware block diagram of a distributed reactive compensation device controller used in the present invention;
fig. 2 is a flow chart of the control of the distributed reactive power compensation device controller used in the present invention;
FIG. 3 is a diagram of a wireless acquisition and secure access system architecture for use with the present invention;
FIG. 4 is a diagram of a power distribution network master station architecture for use with the present invention;
FIG. 5 is a diagram of the overall architecture of a system for use with the present invention;
FIG. 6 is a flow chart of a secondary slack reactive power optimization calculation used by the present invention;
FIG. 7 is a circuit diagram of a fairway hole 8060 line of an example of the present invention;
fig. 8 is a modified fairhole 8060 line circuit diagram of a distributed reactive compensation device of an example of the present invention.
Detailed Description
Example (b):
the embodiment provides a distributed reactive compensation control system for improving network loss, refer to fig. 4, the system comprises a plurality of distributed reactive compensation devices and a distribution network master station, wherein the distributed reactive compensation devices are distributed in 10kV distribution network nodes, the distribution network master station is in communication connection with the distributed reactive compensation devices, the distributed reactive compensation devices are used for acquiring reactive voltage state data of the nodes corresponding to the distributed reactive compensation devices and feeding the voltage reactive state data back to the distribution network master station, the distribution network master station is provided with a network loss optimization algorithm, receives the voltage reactive state data fed back by all the distributed reactive compensation devices, calculates and outputs reactive voltage control parameters corresponding to all the nodes through the network loss optimization algorithm, and the distributed reactive compensation devices regulate and control the reactive voltages of the corresponding nodes according to the reactive voltage control parameters. The distributed reactive power compensation device comprises a parallel capacitor intelligent compensation device and a series capacitor intelligent compensation device. The distribution nodes and the capacities of the intelligent compensation device for the parallel capacitor and the intelligent compensation device for the series capacitor are determined after optimization of an optimization algorithm according to line parameters and load parameters of the power distribution network. The distribution network main station is also connected with a photovoltaic power station and a public distribution transformer with SVG. The invention is also provided with a wireless acquisition and secure access system, see fig. 3.
The acquisition and control structure of the distributed reactive power compensation device related to the collection link is shown in figure 1, and the voltage and the reactive power of a grid-connected point can be rapidly acquired and controlled;
the reactive voltage control flow of the reactive power compensation device according to the present invention is shown in fig. 2, and can realize a fast check and output control logic.
The intelligent compensation device of the parallel capacitor, the intelligent compensation device of the series capacitor, the photovoltaic power station and the public distribution transformer with the SVG are used as reactive power sources to communicate with a distribution network master station for information interaction. The communication mode of the distribution network main station and the distributed reactive power compensation device is wired communication or wireless communication. Wired communication is adopted with good communication conditions; the wireless communication mode is 4G or 5G communication.
The network loss optimization algorithm comprises a network loss target minimum function:
Figure BDA0003161156430000051
wherein, PLossFor line losses in the grid, N is the number of nodes in the grid, Ii，RIs the current flowing through the i node, Ri，LIs the equivalent resistance of the i node in the power grid.
The distribution network also includes the following constraints: power balance constraint, which is used for meeting the power flow balance of the power grid;
node voltage constraint:
Figure BDA0003161156430000052
wherein Vi min，Vi maxMinimum and maximum voltage amplitude limits, respectively;
and node reactive power output constraint:
Figure BDA0003161156430000061
wherein QG,iRepresenting a real-time reactive output of the reactive power compensation device;
Figure BDA0003161156430000062
and
Figure BDA0003161156430000063
the real-time regulation capability of the distributed reactive power compensation device i is represented, and is calculated in real time by the reactive power compensation device nodeUploading, in order to ensure the consistency and synchronization of data, the distributed reactive compensation device will collect QG,iThe data are also uploaded to a power distribution network master station;
capacitive reactance device constraint:
Figure BDA0003161156430000064
wherein:
Figure BDA0003161156430000065
and
Figure BDA0003161156430000066
then represents the real-time tuning range of the capacitive reactance device i;
restraint of the adjustable transformer device:
Figure BDA0003161156430000067
wherein
Figure BDA0003161156430000068
And
Figure BDA0003161156430000069
it represents the real-time regulation range of the adjustable transformer means i.
The invention completes the reactive power optimization control of the power distribution network in a mode of centralized optimization of the control master station, wherein the functions of the compensation node comprise local data acquisition, real-time calculation of local regulation capacity, coordination of data wireless communication uploading, receiving of real-time instructions and instruction issuing to controllable equipment in the node range to complete local regulation and control. When the reactive power optimization control of the long-line heavy-load power distribution network is realized, the distributed compensation node design based on the line load characteristics is adopted, the compensation node functions comprise data acquisition analysis, calculation, communication, regulation and control of related equipment and the like of the corresponding device location, and the control master station realizes the reactive power voltage optimization control of the whole line through comprehensive coordination optimization.
The whole framework of the invention is shown in fig. 5, the sensing of voltage reactive power around the distributed reactive power compensation devices and the regulation and control of related equipment are completed through the distributed reactive power compensation devices, the distributed reactive power compensation devices are optimally controlled by the distribution network master station, real-time interaction is realized, and the effective control of the reactive voltage of the whole line is realized.
The control process of the invention is divided into three links of collection, processing and feedback, wherein the three links are circularly carried out to carry out reactive power real-time optimization control on the power distribution network:
(1) collecting: the distributed reactive power compensation device collects the power measurement of peripheral related equipment;
(2) and (3) treatment: calculating reactive power of the distributed reactive power compensation devices and the adjustable range of the reactive power according to the collected power measurement and node parameters, and uploading the reactive power to a power distribution network master station, wherein the power distribution network master station performs optimization processing by combining a whole network model, parameters and data;
(3) and (3) feedback: and the distribution network master station transmits the processed result to a related distributed reactive power compensation device, the distributed reactive power compensation device checks the received calculation result together with local acquired data and equipment parameters, and sends an adjusting instruction to the controllable equipment so as to achieve the purpose of voltage reactive power control. The optimization method adopts a secondary relaxation reactive power optimization algorithm, and refers to fig. 6.
In the embodiment, the actual operation of the bottleneck 8060 line in the thoroughfare state is combined, and the actual historical data of the station is utilized to perform simulation calculation on line load and photovoltaic power generation.
The line of the pre-reconstruction and post-reconstruction cavities 8060 is shown in fig. 6 and 7.
Fairy cave 8060 line maximum load 2020, 11, 14, 7: 50 has 7.6893MW of power and 3.51738MVar of idle power. Power factor 0.87. Active loss 573kW before compensation. The line voltage is in the range of (8.9-10.5) kV.
The fairy-cave 8060 line is modified using the following scheme:
Figure BDA0003161156430000071
active loss after compensation: 456kW, reduced by 117 kW. The line voltage (9.5-10.5) kV and the annual saving electric quantity (117 x 0.35) are 41 ten thousand kWh, namely 41 ten thousand degrees can be saved each year after compensation.

Claims (7)

1. The utility model provides an improve distributed reactive compensation control system of net loss, characterized by, include distributed reactive compensation device and the distribution network main website of a plurality of distribution installations in the distribution network node, distribution network main website and distributed reactive compensation device communication connection, distributed reactive compensation device is used for acquireing its reactive voltage state data that corresponds the node to with voltage reactive state data feedback to the distribution network main website, the distribution network main website is equipped with net loss optimal algorithm, receives the voltage reactive state data of all distributed reactive compensation device feedbacks, calculates the reactive voltage control parameter that all nodes correspond through net loss optimal algorithm, distributed reactive compensation device regulates and control its reactive voltage that corresponds the node according to the reactive voltage control parameter.
2. The distributed reactive compensation control system for improving the network loss according to claim 1, wherein the distributed reactive compensation device comprises a parallel capacitor intelligent compensation device and a series capacitor intelligent compensation device.
3. The distributed reactive compensation control system for improving the network loss of claim 1, wherein a photovoltaic power station and a public distribution transformer with SVG are further connected to the distribution network main station.
4. The distributed reactive compensation control system for improving the network loss as claimed in claim 1, wherein the communication mode between the distribution network main station and the distributed reactive compensation device is wire communication.
5. The distributed reactive compensation control system for improving the network loss according to claim 1, wherein the communication mode between the distribution network main station and the distributed reactive compensation device is 4G or 5G wireless communication.
6. The system of claim 1, wherein the network loss optimization algorithm comprises a network loss objective minimization function:
Figure FDA0003161156420000011
wherein, PLossFor line losses in the grid, N is the number of nodes in the grid, Ri，RIs the current flowing through the i node, Ri，LIs the equivalent resistance of the i node in the power grid.
7. The distributed reactive compensation control system for improving network loss of claim 6, wherein said distribution network further comprises the following constraints: power balance constraint, which is used for meeting the power flow balance of the power grid;
node voltage constraint:
Vi min≤Vi≤Vi max i＝1...NPQ
wherein Vi min，Vi maxMinimum and maximum voltage amplitude limits, respectively;
and node reactive power output constraint:
Figure FDA0003161156420000021
wherein QG,iRepresenting a real-time reactive output of the reactive power compensation device;
Figure FDA0003161156420000022
and
Figure FDA0003161156420000023
then represents distributed reactive compensationThe real-time regulation capacity of the device i is calculated and uploaded by the reactive compensation device nodes in real time, and in order to ensure the consistency and synchronization of data, the distributed reactive compensation device collects QG,iThe data are also uploaded to a power distribution network master station;
capacitive reactance device constraint:
Figure FDA0003161156420000024
wherein:
Figure FDA0003161156420000025
and
Figure FDA0003161156420000026
then represents the real-time tuning range of the capacitive reactance device i;
restraint of the adjustable transformer device:
Figure FDA0003161156420000027
wherein
Figure FDA0003161156420000028
And
Figure FDA0003161156420000029
it represents the real-time regulation range of the adjustable transformer means i.
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