Power distribution network dynamic stability control method

Abstract

The invention discloses a method for controlling the dynamic stability of a power distribution network, and relates to a method for controlling the stability of the power distribution network, which comprises the following steps of: respectively constructing a data acquisition connector and a data authority acquisition system by a central centralized control station analysis control system of an intelligent digital centralized control station; the data acquisition connector is respectively connected with power distribution systems of power source units and subordinate power companies, high-voltage, ultrahigh-voltage and extra-high-voltage systems accessed by transformer substations of the power source units are used for real-time monitoring, and a database is formed by various acquired power entry data. An algorithm prediction result and a supply and demand balance value are formed on the basis of the real-time feedback information and the conventional power consumption of the past power customers, and the central centralized control station analysis control system continuously adjusts the inverter of each power source unit according to the real-time feedback information and performs real-time extension and reutilization of database data; according to the invention, the central centralized control station uses the collected historical information and the real-time collected supplementary information to control the balance of power supply and power supply.

Description

Technical Field

[0001] The present invention relates to a stability control method for a distribution network, and in particular to a dynamic stability control method for a distribution network. Background Art

[0002] At present, the environmental, climate and energy problems caused by the rapid development of the world economy are becoming more and more prominent. In order to achieve the sustainability of my country's economic development, vigorously promoting the development of new energy industries and their reasonable layout has become the mainstream of society. The basic requirements of the country for electric energy are to achieve the economy, environmental protection, safety and reliability of power supply. Distributed power sources (DG) that can use renewable clean energy for power generation have the advantages of environmental protection, low investment, flexible power generation methods, low operating costs and high reliability. Compared with the centralized power generation method of large power grids, they have obvious advantages, and their role in distribution networks will become more and more prominent. Therefore, the combination of centralized power supply of large power grids and decentralized access of distributed power sources is an important development trend in power grid construction. Different from the operating characteristics of traditional distribution networks, the new distribution network contains a large number of distributed power sources with inverter interfaces, which leads to its extreme lack of electrical inertia and poor dynamic stability of system operation. Specifically, it is difficult to suppress and eliminate power oscillations after the system is disturbed, lacks active synchronization capabilities, and reverse Problems such as overload and overvoltage are prominent. At the same time, affected by the characteristics of primary energy generation, the operating characteristics of grid-connected distributed power sources vary greatly and the control methods are different, resulting in complex system dynamics, poor interaction and active support capabilities between single distributed power sources and distribution networks, and poor networking flexibility. Distributed power sources are prone to asynchronous power oscillations, which seriously threaten the safe operation of the power system. At present, smart grids are developing rapidly around the world. The main purpose is to require distributed power sources to achieve self-control, protection and management, to form an intelligent distribution network that can be safely and stably connected to the grid and can also operate in an isolated manner, to promote the transformation of the entire system to an "active distribution network", and to form a new distribution network characterized by a ternary structure of "distributed new power sources-distribution network-power load". All of these will bring new challenges to the operation and control of the distribution network. Therefore, how to improve the adverse effects of distributed power access on the distribution network as much as possible and ensure that distributed power sources can give full play to their greatest role is a hot issue in current power research. Summary of the invention

[0003] The purpose of the present invention is to disclose a control method for the dynamic stability of a distribution network based on the existing deficiencies, in which a central control station uses collected historical information and real-time collected supplementary information to control the balance of incoming and outgoing calls.

[0004] In order to achieve the purpose of the invention, the present application discloses the following technical solutions: A control method for the dynamic stability of a distribution network comprises: a central centralized control station analysis and control system of an intelligent digital centralized control station respectively constructs a data acquisition connector and a data authority acquisition system; the data acquisition connectors are respectively connected to the power distribution systems of various power source units and subordinate power companies; high voltage, extra-high voltage and ultra-high voltage systems connected to the substations of various power source units are monitored in real time; a database is formed based on various power input data obtained, and algorithm prediction results and supply and demand balance values ​​are formed based on the conventional power consumption of past power customers; the central centralized control station analysis and control system continuously adjusts the inverters of various power source units according to real-time feedback information, and performs real-time extension and reuse of database data.

[0005] In the control method for the dynamic stability of the distribution network, the central control station analyzes the data permissions of the subordinate power companies obtained by the control system, including user data permissions and business port data permissions; based on the data permissions, the power distribution system of the subordinate power company is supplemented in real time, and permissions are set for the business system database of the subordinate power company; matching business ports and business data information are obtained according to the permission settings; data sources are extracted from the database according to the business data information, and the extracted data sources are displayed in real time on a display.

[0006] The control method for the dynamic stability of the distribution network is as follows: the power distribution system of the subordinate power company contains the daily peak or valley period information of various customers; according to the obtained information, corresponding high-voltage, extra-high-voltage and ultra-high-voltage systems are established, as well as photovoltaic power stations, wind power generation or energy storage power generation connected through inverters, and the shortage of electricity is allocated through the inverter to maintain the dynamic stability of the power grid.

[0007] The control method for the dynamic stability of the distribution network is as follows: when an excessive incoming voltage appears in the high-voltage, extra-high-voltage, and ultra-high-voltage systems, wind power generation and photovoltaic power stations connected to the incoming power substation, based on the algorithm prediction results and the supply and demand balance value of the corresponding time period, the central control station analyzes and controls the system to promptly start the corresponding number of vehicle charging pile energy storage battery groups and reservoir energy storage as needed to maintain the dynamic stability of the power grid.

[0008] In the control method for the dynamic stability of the distribution network, the detection module in the central control station analysis control system detects and analyzes the incoming power of the power source unit in real time based on the detection module of the power distribution system of the subordinate power company, and the control module controls and adjusts the balance of supply and demand.

[0009] In the control method for the dynamic stability of the distribution network, the energy storage detection control module in the central control station analysis control system performs real-time monitoring and control on the high-voltage, extra-high-voltage and ultra-high-voltage systems connected to each power source unit substation.

[0010] Through the above disclosure, the beneficial effects of the present invention are: The control method for the dynamic stability of the distribution network described in the present invention is to set an analysis and control system at the central control station of the intelligent digital control station, and the analysis and control system is connected to the power distribution system of each power source unit and the subordinate power company through a data acquisition connector and a data authority acquisition system, so as to monitor the high-voltage, extra-high-voltage and ultra-high-voltage systems connected to the substation of each power source unit in real time, and form a database with various power input data monitored in real time, and form algorithm prediction results and supply and demand balance values ​​based on the conventional power consumption collected by the database and past power customers, compare the prediction results with the supply and demand balance values ​​through the database, and then continuously adjust the dynamic stability of the distribution network, and extend and reuse the newly collected data in real time to obtain the continuous dynamic stability of the distribution network; the present invention effectively improves the adverse effects of distributed power access on the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic flow chart of a method for controlling dynamic stability of a distribution network according to the present invention; DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to explain that the technical solution of the present invention is not limited to one implementation method.

[0013] Combined with Figure 1The control method for dynamic stability of the distribution network described in the above is that the central centralized control station analysis and control system of the intelligent digital centralized control station respectively builds a data acquisition connector and a data authority acquisition system, and the data acquisition connectors are respectively connected to the power distribution systems of various power source units and subordinate power companies. The data authority of the subordinate power company obtained by the central centralized control station analysis and control system includes user data authority and business port data authority; based on the data authority, the power distribution system of the subordinate power company is supplemented with a database in real time, and authority is set for the business system database of the subordinate power company; matching business ports and business data information are obtained according to the authority setting; according to the business data information The data source is extracted from the database, and the extracted data source is displayed in real time on the display; the high-voltage, ultra-high-voltage and ultra-high-voltage systems connected to the substations of each power source unit are monitored in real time, and the power distribution system of the subordinate power company contains the daily peak or valley period information of various customers; according to the obtained information, the corresponding high-voltage, ultra-high-voltage and ultra-high-voltage systems connected and the photovoltaic power station, wind power generation or energy storage power generation connected through the inverter are established, and the insufficient power allocation of incoming calls is made through the inverter to maintain the dynamic stability of the power grid; when the high-voltage, ultra-high-voltage, ultra-high-voltage systems connected to the incoming call substation, the wind power generation and photovoltaic power station that cannot be stored have excessive incoming call voltage, the algorithm is used to predict the result The results and the supply and demand balance values ​​of the corresponding time period are collected and pre-processed, and the central control station analyzes and controls the system to promptly start the corresponding number of vehicle charging pile energy storage battery packs as needed. "The vehicle charging pile energy storage battery packs store excess electricity. Of course, there are also some large-scale storage power stations connected to the enterprise network that can also store excess electricity at the same time" and reservoir energy storage to maintain the dynamic stability of the power grid; a database is formed on the various power input data obtained, a power grid knowledge base is established, and the power grid status is monitored in real time. Based on the conventional power consumption of past power customers, the algorithm prediction results and supply and demand balance values ​​are formed, and the transient stability changes of the power system are predicted; the central control station The detection module in the station analysis and control system detects and analyzes the incoming power of the power source unit in real time based on the detection module of the power distribution system of the subordinate power company, and the control module controls and adjusts the balance of supply and demand; the energy storage detection control module in the central control station analysis and control system monitors and controls the high-voltage, extra-high-voltage and ultra-high-voltage systems connected to the substations of each power source unit in real time; the central control station analysis and control system continuously adjusts the inverters of each power source unit according to the real-time feedback information and performs real-time extension and reuse of database data; optimizes the control strategy of the inverter based on the prediction results and adjusts the system parameters; monitors the operating status of the optimized system in real time and performs control and adjustment.

[0014] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications within the scope of protection of the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

[0015] The parts not described in detail in this invention are prior art.

Claims

1. A method for controlling the dynamic stability of a distribution network, characterized in that: The central control station analysis and control system of the intelligent digital control station builds data acquisition connectors and data authority acquisition systems respectively. The data acquisition connectors are connected to the power distribution systems of various power source units and subordinate power companies respectively. The high-voltage, extra-high-voltage and ultra-high-voltage systems connected to the substations of various power source units are monitored in real time. A database is formed based on the various power input data obtained, and algorithm prediction results and supply and demand balance values ​​are formed based on the regular power consumption of past power customers. The central control station analysis and control system continuously adjusts the inverters of various power source units according to real-time feedback information, and performs real-time extension and reuse of database data.

2. The method for controlling the dynamic stability of a distribution network according to claim 1, characterized in that: The central control station analyzes and controls the subordinate power company's data permissions obtained by the control system, including user data permissions and business port data permissions; based on the data permissions, the power distribution system of the subordinate power company is supplemented with a database in real time, and permissions are set for the subordinate power company's business system database; matching business ports and business data information are obtained according to the permission settings; data sources are extracted from the database according to the business data information, and the extracted data sources are displayed in real time on a display.

3. The method for controlling the dynamic stability of a distribution network according to claim 1, characterized in that: The power distribution system of the subordinate power company contains the daily peak or valley period information of various customers; Based on the information obtained, corresponding high-voltage, extra-high-voltage and ultra-high-voltage systems are established, as well as photovoltaic power stations, wind power generation or energy storage power generation connected through inverters. Incoming calls are connected through inverters to allocate electricity shortages and maintain dynamic stability of the power grid.

4. The method for controlling the dynamic stability of a distribution network according to claim 3 is characterized in that: When the high-voltage, ultra-high-voltage, and extra-high-voltage systems, wind power generation and photovoltaic power stations connected to the incoming power substation have excessive incoming voltage, based on the algorithm prediction results and the supply and demand balance value of the corresponding period, the central control station analyzes and controls the system to promptly start the corresponding number of vehicle charging pile energy storage battery packs and reservoir energy storage as needed to maintain the dynamic stability of the power grid.

5. The method for controlling the dynamic stability of a distribution network according to claim 3, characterized in that: The detection module in the central control station analysis control system detects and analyzes the power supply unit's incoming power in real time using the detection module of the power distribution system of the subordinate power company, and the control module controls and adjusts the balance of supply and demand.

6. The method for controlling the dynamic stability of a distribution network according to claim 3, characterized in that: The energy storage detection control module in the central control station analysis and control system performs real-time monitoring and control on the high-voltage, extra-high-voltage and ultra-high-voltage systems connected to each power source unit substation.

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