CN114157027B - System and method for regulating and controlling operation of distributed photovoltaic access power distribution network - Google Patents

System and method for regulating and controlling operation of distributed photovoltaic access power distribution network Download PDF

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Publication number
CN114157027B
CN114157027B CN202111426631.6A CN202111426631A CN114157027B CN 114157027 B CN114157027 B CN 114157027B CN 202111426631 A CN202111426631 A CN 202111426631A CN 114157027 B CN114157027 B CN 114157027B
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voltage
substation
distribution network
quality
distributed photovoltaic
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CN114157027A (en
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姚知洋
陈卫东
卢健斌
阮诗雅
龚文兰
郭敏
韩帅
金庆忍
孙乐平
吴晓锐
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • 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
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • 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
    • H02J3/18—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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
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    • 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
    • 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
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    • Y02B10/10—Photovoltaic [PV]
    • 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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    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • 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
    • 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
    • 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
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
    • 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
    • Y04S10/16—Electric power substations
    • 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
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location
    • 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
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
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    • 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
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    • 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
    • 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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  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention belongs to the technical field of distributed photovoltaics, and particularly relates to a system and a method for regulating and controlling operation of a distributed photovoltaic access power distribution network. The system adopts a three-layer structure mode, namely a main station, a substation and a terminal voltage quality measuring device, wherein the voltage quality detecting device is arranged at a grid-connected point of a photovoltaic power generation user and is used for collecting voltage signals of the grid-connected point, and voltage quality information to be monitored is collected and sent to the substation through a unified data access standard and a data model. The substation obtains the voltage quality grade of each line of the substation through a voltage quality analysis method, and transmits the voltage quality grade to the master station, so that data reference is provided for the master station to carry out voltage quality improvement. According to the method, the voltage quality of the node to be detected is rated, and whether the circuit where the node to be detected is located can be provided with photovoltaic or not can be preliminarily judged according to the voltage quality grade; or corresponding voltage quality adjustment is carried out on the node to be detected, on which the photovoltaic is installed.

Description

System and method for regulating and controlling operation of distributed photovoltaic access power distribution network
Technical Field
The invention belongs to the technical field of distributed photovoltaics, and particularly relates to a system and a method for regulating and controlling operation of a distributed photovoltaic access power distribution network.
Background
The photovoltaic industry is one of the important development directions of new energy industry, and the development of the photovoltaic market has important significance for optimizing the energy structure of China, promoting the energy production and consumption revolution, promoting the energy technical innovation and the like. With the emphasis of the photovoltaic industry and the development and implementation of photovoltaic projects in China, more and more distributed household photovoltaic power sources are connected into rural power distribution areas.
After the photovoltaic system is integrated into a power distribution network, the voltage distribution, network loss and steady-state short circuit smart flow of the power distribution network are greatly influenced, if the sum of the power of all loads at the point and the back is smaller than the sum of the power of all the photovoltaic outputs at the point and the back for one point on the line, the voltage of an access point is increased, and otherwise, the voltage of the access point is reduced. After a single photovoltaic is connected, as the photovoltaic output increases, the line voltage change trend is 3: gradually lowering, lowering before raising and then lowering, raising before lowering. The local voltage of the distributed photovoltaic access point in the latter two cases limits the access capacity of the distributed photovoltaic power generation. The lifting amplitude of the photovoltaic power generation scattered access with the same capacity for the electrification is lower than the voltage lifting amplitude caused by the centralized access of the line 乂 end and higher than the voltage lifting amplitude caused by the centralized access of the front end of the line. As the output of the photovoltaic power supply varies with the incident solar jurisdiction, voltage fluctuations in the local distribution lines may be caused. Although the actual photovoltaic power supply does not cause significant voltage fluctuation, when a large number of grid-connected photovoltaic power supplies are connected, the access position and the access capacity should be reasonably controlled.
Based on the technical problems, the existing public transformer on-line monitoring terminal needs to monitor and manage effective voltage quality of a large number of accessed distributed photovoltaic devices. At present, a plurality of problems exist in the voltage of the transformer areas in a large-scale distributed photovoltaic access area, such as continuous high voltage of a power grid in the daytime power generation peak period, and great safety hidden trouble is brought to electric equipment of users and power grid equipment.
Disclosure of Invention
In order to solve the problems, the invention provides a system and a method for regulating and controlling the operation of a distributed photovoltaic access power distribution network, and the specific technical scheme is as follows:
A regulation and control system for operation of a distributed photovoltaic access power distribution network comprises
The power quality measuring device comprises a plurality of power quality measuring devices arranged on a photovoltaic power generation user side, substation side substations and a distributed power supply main station arranged in a power distribution network automation system;
The electric energy quality measuring device is connected with the distributed photovoltaic device; the power quality measuring device is connected with the substation on the transformer station side in a wireless communication mode, and is used for monitoring the running state of the distributed photovoltaic device and transmitting running state information of the distributed photovoltaic device to the corresponding substation on the transformer station side in a wireless transmission mode;
The substation side substation is used for analyzing the collected information acquired by the plurality of electric energy quality measuring devices and then transmitting the information to a distributed power supply main station in the distribution network automation system;
The distributed power supply main station in the power distribution network automation system is used for processing and analyzing the collected information collected by the power quality measuring devices collected by the substation side substation of each substation area comprising the distributed power supply main station, and carrying out corresponding scheduling according to the scheduling information of the power distribution network automation scheduling system after uploading the information to the power distribution network automation scheduling system.
Preferably, the electric energy quality measuring device is connected with the distributed photovoltaic device through a grid-connected point switch, and the electric energy quality measuring device is connected with the power distribution network and the local load through a public connection point switch respectively.
Preferably, the power quality measurement device further comprises an intelligent terminal installed on a line of the non-distributed photovoltaic device, and the intelligent terminal is used for acquiring the running state of the line and transmitting the acquired running state to a substation on the side of the transformer substation.
A method for regulating and controlling operation of a distributed photovoltaic access power distribution network comprises the following steps:
S1: each voltage quality measuring device in the transformer area transmits the operation data of the distributed photovoltaic devices monitored by each monitoring point to a substation on the transformer side corresponding to the transformer area in real time;
S2: the substation side substation gathers the data monitored by each voltage quality measuring device in the acquired transformer area to a distributed power supply main station;
S3: the distributed power supply main station analyzes the voltage quality of the corresponding distributed photovoltaic devices and analyzes the voltage quality of the transformer areas, and according to the analysis result and a preset voltage control strategy, the distributed power supply main station performs corresponding actions on the voltage regulating devices and performs corresponding scheduling according to the scheduling information of the distribution network automatic scheduling system.
Preferably, the step S1 specifically includes: disconnecting the distributed photovoltaic device to be tested from the power grid, transmitting the monitored voltage data to the substation on the transformer substation side by the voltage quality measuring device, and then connecting the distributed photovoltaic device to be tested to the substation on the transformer substation side by the voltage quality measuring device, so that the master station receives the voltage information of all the corresponding transformer areas, which are connected to the voltage quality measuring device on the distributed photovoltaic device side, of the point before and after the grid connection, analyzing the voltage quality of the grid connection point before and after the grid connection, and adjusting the voltage regulating device according to the analysis result or giving related suggestions to realize the preset voltage control strategy of the system.
Preferably, the voltage quality analysis comprises analysis of total harmonic distortion rate, voltage deviation rate and voltage fluctuation of current before and after grid connection of the distributed photovoltaic device.
Preferably, the specific steps of the voltage quality analysis in the step S3 are as follows:
(1) Grading the ranges of three voltage quality indexes of the current total harmonic distortion rate A1, the voltage deviation rate A2 and the voltage fluctuation A3; dividing the current into five levels of excellent, good, medium, poor and unqualified, wherein each level range in An index is respectively represented by (Qn 1, qn2, qn3, qn4, qn5, n is An integer less than or equal to 3), wherein the levels Qn1 to Qn5 are respectively represented by numbers 1,2, 3, 4 and 5, and the voltage quality represented by the levels decreases step by step;
(2) Taking the median value of the range in each grade in three voltage quality indexes, wherein each median value is the grading standard of the grade of the index; thereby forming three voltage quality indexes of grading standard decision units DMU1, DMU2, DMU3, DMU4 and DMU5 of current total harmonic distortion A1, voltage deviation A2 and voltage fluctuation A3; each grading standard decision unit comprises three evaluation indexes, namely a current total harmonic distortion rate A1, a voltage deviation rate A2 and a voltage fluctuation A3;
(3) And calculating the total current harmonic distortion rate A1, the voltage deviation rate A2 and the voltage fluctuation A3 of the node to be tested, and calculating the matching degree with each voltage grade according to the voltage quality calculation result of the node to be tested, wherein the voltage grade with the highest matching degree is used as the voltage quality grade of the node to be tested.
Preferably, the voltage quality level of the node to be tested is calculated by using a data envelope analysis method.
Preferably, the matching degree of the power quality calculation result of the node to be measured and each voltage level is calculated by using the Euclidean distance, and the smaller the Euclidean distance is, the higher the corresponding matching degree is.
The beneficial effects of the invention are as follows: the system adopts a three-layer structure mode, which is respectively a main station, a substation and a terminal voltage quality measuring device, wherein the main station is arranged in a power distribution automation system, and the substation is arranged in a transformer substation. The voltage quality detection device is arranged on a grid-connected point of a photovoltaic power generation user and used for collecting voltage signals of the grid-connected point, and voltage quality information to be monitored is collected and sent to the substation through a unified data access standard and a data model. The substation obtains the voltage quality grade of each line of the substation through a voltage quality analysis method, and transmits the voltage quality grade to the master station, so that data reference is provided for the master station to carry out voltage quality improvement.
According to the method, the voltage quality of the node to be detected is rated, and whether the photovoltaic can be installed on the line where the node to be detected is located or not can be primarily judged according to the voltage quality grade; or carrying out corresponding voltage quality adjustment on the node to be detected, on which the photovoltaic is installed.
According to the invention, the fault occurrence point can be rapidly positioned when the distributed photovoltaic device transmits a fault or detects a voltage fault, so that the distributed power supply fault maintenance and management work in the future are facilitated; meanwhile, the distributed power management master station can be responsible for carrying out the optimization scheduling command of the whole network, and can also be used as a reactive power control and adjustment device to adjust the reactive power distribution of the whole line when the distributed power is not generated, so as to reduce the loss and optimize the line.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a system structure according to the present invention.
Fig. 2 is a structural diagram of a photovoltaic power generation system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1, the embodiment of the invention provides a regulation and control system for operation of a distributed photovoltaic access power distribution network, which comprises
The power quality measuring device comprises a plurality of power quality measuring devices arranged on a photovoltaic power generation user side, substation side substations and a distributed power supply main station arranged in a power distribution network automation system;
The electric energy quality measuring device is connected with the distributed photovoltaic device; the power quality measuring device is connected with the substation on the transformer station side in a wireless communication mode, and is used for monitoring the running state of the distributed photovoltaic device and transmitting running state information of the distributed photovoltaic device to the corresponding substation on the transformer station side in a wireless transmission mode;
The substation side substation is used for analyzing the collected information acquired by the plurality of electric energy quality measuring devices and then transmitting the information to a distributed power supply main station in the distribution network automation system;
The distributed power supply main station in the power distribution network automation system is used for processing and analyzing the collected information collected by the power quality measuring devices collected by the substation side substation of each substation area comprising the distributed power supply main station, and carrying out corresponding scheduling according to the scheduling information of the power distribution network automation scheduling system after uploading the information to the power distribution network automation scheduling system.
The power quality measuring device is connected with the distributed photovoltaic device through a grid-connected point switch, and the power quality measuring device is connected with the power distribution network and the local load through a public connection point switch. The power quality measuring device further comprises an intelligent terminal arranged on the line of the non-distributed photovoltaic device, and the intelligent terminal is used for collecting the running state of the line and transmitting the collected running state to a substation at the substation side.
The specific embodiment of the invention also provides a method for regulating and controlling the operation of the distributed photovoltaic access power distribution network, which comprises the following steps:
S1: each voltage quality measuring device in the transformer area transmits the operation data of the distributed photovoltaic devices monitored by each monitoring point to a substation on the transformer side corresponding to the transformer area in real time; the method specifically comprises the following steps: disconnecting the distributed photovoltaic device to be tested from the power grid, transmitting the monitored voltage data to the substation on the side of the transformer substation by the voltage quality measuring device, and then connecting the distributed photovoltaic device to be tested to the substation on the side of the transformer substation by the voltage quality measuring device, so that the master station receives the voltage information of all the corresponding transformer areas, which is connected to the voltage quality measuring device on the side of the distributed photovoltaic device, of the point before and after the grid connection, so as to analyze the voltage quality of the grid connection point before and after the grid connection, and adjusting the voltage regulating device according to the analysis result or giving related advice to realize the preset voltage control strategy of the system. The voltage regulating device comprises an on-load voltage regulating transformer, a low-voltage line voltage regulator, a photovoltaic inverter and a transformer area reactive power compensation device, wherein the reactive power compensation device comprises a synchronous regulator, a switch switching fixed capacitor, a static reactive power compensator and a static reactive power generator.
S2: the substation side substation gathers the data monitored by each voltage quality measuring device in the acquired transformer area to a distributed power supply main station;
S3: the distributed power supply main station analyzes the voltage quality of the corresponding distributed photovoltaic devices and analyzes the voltage quality of the transformer areas, and according to the analysis result and a preset voltage control strategy, the distributed power supply main station performs corresponding actions on the voltage regulating devices and performs corresponding scheduling according to the scheduling information of the distribution network automatic scheduling system. The voltage quality analysis comprises analysis of total harmonic distortion rate, voltage deviation rate and voltage fluctuation of the current before and after grid connection of the distributed photovoltaic device. The strategy for solving the total harmonic distortion rate of the current is to change the access position or increase a harmonic elimination device on the side of a total user or increase harmonic suppression on the side of an inverter; the solution strategy of poor voltage deviation rate is to change the access position or the wire model or increase reactive compensation; the solution to the poor voltage ripple is to increase the energy storage device or increase the short circuit capacity.
The specific steps of the voltage quality analysis are as follows:
(1) Grading the ranges of three voltage quality indexes, namely a current total harmonic distortion rate A1, a voltage deviation rate A2 and a voltage fluctuation A3 according to the national standard; the method is divided into five grades of excellent grade, good grade, medium grade, poor grade and unqualified grade, wherein each grade range of An index is respectively represented by (Qn 1, qn2, qn3, qn4, qn5, n is An integer less than or equal to 3), the grades Qn1 to Qn5 are respectively represented by numbers 1,2, 3, 4 and 5, the voltage quality represented by the grades is gradually decreased, the range of Qn1 is a range corresponding to the index specified by a range according to a national standard, the An index is one index of three voltage quality indexes of current total harmonic distortion rate and voltage deviation rate voltage fluctuation, and the table 1 is a voltage quality grade division standard:
TABLE 1 Voltage quality class division criteria
(2) Taking the median value of the range in each grade in three voltage quality indexes, wherein each median value is the grading standard of the grade of the index; thereby forming three voltage quality indexes of grading standard decision units DMU1, DMU2, DMU3, DMU4 and DMU5 of current total harmonic distortion A1, voltage deviation A2 and voltage fluctuation A3; each grading standard decision unit comprises three evaluation indexes, namely a current total harmonic distortion rate A1, a voltage deviation rate A2 and a voltage fluctuation A3; as shown in table 2 below:
TABLE 2 Voltage quality grading Standard
DMU DMU1 DMU2 DMU3 DMU4 DMU5
A1 0.05 0.30 0.65 0.85 0.90
A2 0.60 2.10 3.75 5.75 7.00
A3 0.10 0.35 0.65 0.90 1.00
Q 1 2 3 4 5
(3) And calculating the total current harmonic distortion rate A1, the voltage deviation rate A2 and the voltage fluctuation A3 of the node to be tested, and calculating the matching degree with each voltage grade according to the voltage quality calculation result of the node to be tested, wherein the voltage grade with the highest matching degree is used as the voltage quality grade of the node to be tested. And calculating the matching degree of the electric energy quality calculation result of the node to be measured and each voltage level by adopting the Euclidean distance, wherein the smaller the Euclidean distance is, the higher the corresponding matching degree is. The specific calculation mode is as follows:
Wherein A j is the j-th evaluation index obtained by calculation, and the j-th evaluation index is the current total harmonic distortion A1, the voltage deviation A2 and the voltage fluctuation A3, A ij in the i-th hierarchical standard decision unit DMU respectively.
The method specifically comprises the steps of calculating the voltage quality grade of a node to be tested by adopting a data envelope analysis method, and specifically comprises the following steps: combining the m nodes to be detected with voltage quality grades (1, 2,3,4, 5) to form m 5 decision units DMU to be detected; taking the current total harmonic distortion rate, the voltage deviation rate and the voltage fluctuation as input characteristic parameters, taking a voltage quality grade value as output, and solving a BCC model by adopting a DAC algorithm to calculate the efficiency values of m.5 decision units and 5 grading standard decision units; comparing the efficiency values of the decision units DMU of the nodes to be detected with the efficiency values of the hierarchical standard decision units DMU1, DMU2, DMU3, DMU4 and DMU5 respectively to obtain comparison degrees, and taking the corresponding grade with the minimum comparison degree as the evaluation grade of the nodes to be detected; the more the effective value of the node DMU to be detected is close to the five standard decision units, the higher the similarity of the input index and the output index of the DMU is, and the DMU is classified as the standard grade; obtaining a final voltage quality grading evaluation result, and obtaining the voltage quality grade of the node to be detected;
the method for calculating the efficiency value of each decision unit by solving the BCC model through the DAC algorithm specifically comprises the following steps:
S31: the linear equation of m-dimensional input and s-dimensional output is established by adopting a C 2 R model, and the method is specifically as follows:
wherein θ is the relative efficiency index of the current decision unit based on the standard decision unit; Is an m-dimensional vector with elements of 1,/> Is an s-dimensional vector with elements of 1, and s is the number of output quantities of each unit; x j and y j represent the input and output, respectively, of the j-th decision unit.
S -＝(s1 -,s2 -,…,sm -)T is the remaining variable of the m term input, s +＝(s1 +,s2 +,…,sm +)T is the relaxation variable, lambda j is the weight of the decision unit, epsilon represents a non-archimedes infinitesimal quantity;
S32: based on constraint conditions And solving a relative efficiency value theta 0 of the optimal solution of the model.
As shown in fig. 2, the photovoltaic power generation system is composed of a plurality of solar panels and a junction box, and a plurality of inverters. The transformer station is accessed through an isolation transformer and a0 step-up transformer, as shown in fig. 2. The voltage quality measuring device is arranged between the grid connection point and the public connection point and is used for monitoring voltage quality parameters at the public connection point or the grid connection point, and during testing, the photovoltaic device to be tested is subjected to analysis of total current harmonic distortion rate, voltage deviation rate and voltage fluctuation before and after grid connection, and if the total current harmonic distortion rate, the voltage deviation rate and the voltage fluctuation are poor, the photovoltaic device cannot be connected into a power grid. When the power distribution network voltage monitoring device is used at ordinary times, the voltage quality testing device can be used as the power distribution network voltage monitoring device to monitor the voltage quality.
The method comprises the steps of determining three aspects of voltage quality, frequency quality and power supply reliability according to a series of national voltage quality standards issued by China and considering two indexes of complexity, voltage sag and power supply reliability of a photovoltaic access circuit, selecting three indexes of current total harmonic distortion rate, voltage deviation rate and voltage fluctuation as evaluation indexes of a distributed photovoltaic access power distribution network, classifying the voltage of a node to be detected by adopting a data envelope analysis method, and transmitting the evaluated grades to a master station.
Based on a data envelope analysis method, comparing the efficiency values of the voltage quality decision units of the detection nodes with those of the grading standard decision units, wherein the closer the effective values of the voltage quality decision units to be evaluated are to the five standard decision units, the higher the similarity between the input index and the output index of the DMU is, the standard grade is classified, and therefore final voltage quality grading evaluation is achieved.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the elements of the examples have been described generally in terms of functionality in the foregoing description to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiment provided in the present application, it should be understood that the division of the units is merely a logic function division, and there may be other division manners in practical implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims (6)

1. A method for regulating and controlling operation of a distributed photovoltaic access power distribution network is characterized by comprising the following steps of: the method comprises the following steps:
S1: each voltage quality measuring device in the transformer area transmits the operation data of the distributed photovoltaic devices monitored by each monitoring point to a substation on the transformer station side corresponding to the transformer area in real time;
The step S1 specifically includes: disconnecting the distributed photovoltaic device to be tested from the power grid, transmitting the monitored voltage data to a substation side substation by a voltage quality measuring device, and then connecting the distributed photovoltaic device to be tested to the substation side substation by the voltage quality measuring device, so that the master station receives the voltage information of all the corresponding transformer areas, which are connected to the voltage quality measuring device at the distributed photovoltaic device side, before and after the grid connection, at the point, analyzing the voltage quality of the grid connection point before and after the grid connection, and adjusting the voltage regulating device according to the analysis result or giving related advice to realize the preset voltage control strategy of the system; the voltage quality analysis comprises analysis of total current harmonic distortion rate, voltage deviation rate and voltage fluctuation of the distributed photovoltaic device before and after grid connection;
s2: the substation side substation gathers the data monitored by each voltage quality measuring device in the acquired transformer area to a distributed power supply main station;
S3: the distributed power supply main station analyzes the voltage quality of the corresponding distributed photovoltaic device and analyzes the voltage quality of the station area, and according to the analysis result and a preset voltage control strategy, the distributed power supply main station performs corresponding actions on the voltage regulating device and performs corresponding scheduling according to the scheduling information of the power distribution network automatic scheduling system;
the specific steps of the voltage quality analysis in the step S3 are as follows:
(1) Grading the ranges of three voltage quality indexes of the current total harmonic distortion rate A1, the voltage deviation rate A2 and the voltage fluctuation A3; dividing the index into five grades of excellent, good, medium, poor and unqualified, wherein each grade range in An index is respectively represented by Qn1, qn2, qn3, qn4 and Qn5, and n is An integer less than or equal to 3; wherein the grades Qn1 to Qn5 are numbers 1,2,3, 4, 5 respectively, and the voltage quality represented by the grades is gradually decreased; an index is one of three voltage quality indexes of current total harmonic distortion rate, voltage deviation rate and voltage fluctuation;
(2) Taking a median value from the range of each grade in three voltage quality indexes, wherein each median value is the grading standard of the grade of the index; thereby forming three voltage quality index grading standard decision units DMU1, DMU2, DMU3, DMU4 and DMU5 of current total harmonic distortion A1, voltage deviation A2 and voltage fluctuation A3; each grading standard decision unit comprises three evaluation indexes, namely a current total harmonic distortion rate A1, a voltage deviation rate A2 and a voltage fluctuation A3;
(3) And calculating the total current harmonic distortion rate A1, the voltage deviation rate A2 and the voltage fluctuation A3 of the node to be tested, and calculating the matching degree with each voltage grade according to the voltage quality calculation result of the node to be tested, wherein the voltage grade with the highest matching degree is used as the voltage quality grade of the node to be tested.
2. The method for regulating operation of a distributed photovoltaic access power distribution network according to claim 1, wherein the method comprises the following steps: and calculating the voltage quality grade of the node to be tested by adopting a data envelope analysis method.
3. The method for regulating operation of a distributed photovoltaic access power distribution network according to claim 1, wherein the method comprises the following steps: and calculating the matching degree of the electric energy quality calculation result of the node to be measured and each voltage grade by adopting the Euclidean distance, wherein the smaller the Euclidean distance is, the higher the corresponding matching degree is.
4. A regulation and control system of distributed photovoltaic access distribution network operation, its characterized in that: the method for realizing the regulation and control of any one of claims 1 to 3, comprising
The power quality measuring device comprises a plurality of power quality measuring devices arranged on a photovoltaic power generation user side, substation side substations and a distributed power supply main station arranged in a power distribution network automation system;
The electric energy quality measuring device is connected with the distributed photovoltaic device; the power quality measuring device is connected with the substation side substation in a wireless communication mode and is used for monitoring the running state of the distributed photovoltaic device and transmitting running state information of the distributed photovoltaic device to the corresponding substation side substation in a wireless transmission mode;
the substation side substation is used for analyzing the collected information acquired by the plurality of electric energy quality measuring devices and then transmitting the information to a distributed power supply main station in the distribution network automation system;
The distributed power supply main station in the power distribution network automation system is used for processing and analyzing the collected information collected by the power quality measuring devices collected by the substation side sub stations of each station area including the distributed power supply main station, and the information is uploaded to the power distribution network automation dispatching system and then correspondingly dispatched according to dispatching information of the power distribution network automation dispatching system.
5. The regulation and control system for operation of a distributed photovoltaic access power distribution network of claim 4, wherein: the power quality measuring device is connected with the distributed photovoltaic device through the grid-connected point switch, and the power quality measuring device is connected with the power distribution network and the local load through the public connection point switch.
6. The regulation and control system for operation of a distributed photovoltaic access power distribution network of claim 4, wherein: the power quality measuring device further comprises an intelligent terminal arranged on the non-distributed photovoltaic device line and used for collecting the running state of the line and transmitting the collected running state to a substation at the side of the transformer substation.
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