CN-121984080-A - Flexible full-autonomous grid-connected control method and system for multi-station power grid

CN121984080ACN 121984080 ACN121984080 ACN 121984080ACN-121984080-A

Abstract

The invention provides a flexible full-automatic grid-connected control method and system for a multi-station power grid, which comprise the steps of dividing voltage domains corresponding to different power supply demand states for bus bars among the stations in the multi-station power grid, dividing voltage domains corresponding to different energy supply demand states for bus bars in the stations, monitoring actual voltages of the bus bars among the stations and the bus bars in each station, judging the current power supply demand state and the current energy supply demand state according to the actual voltages, and adjusting the actual voltages of the bus bars in the stations in the corresponding voltage domains through droop control based on the matching relation between the power supply state and the energy supply demand state. The method has the advantages of constructing an overall-flow autonomous control logic for dividing a voltage domain, monitoring, judging and adjusting, avoiding manual intervention, greatly improving the autonomy of power grid control, realizing flexible adjustment by depending on droop control, avoiding impact of power shock on equipment, prolonging the service life of power grid equipment and improving the high efficiency of energy mutual aid.

Inventors

MA LIJUN
ZHANG DESHENG
LU WEI
ZHANG MING
TONG QIAOLING

Assignees

中电科蓝天科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20251211

Claims (8)

1. The flexible full-autonomous grid-connected control method for the multi-station power grid is characterized by comprising the following steps of: Dividing voltage domains corresponding to different power supply demand states for bus bars among stations in a multi-station power grid; dividing voltage domains corresponding to different energy supply and demand states for buses in the station; Monitoring actual voltages of the inter-station buses and the intra-station buses; Judging the current power supply demand state according to the actual voltage of the bus between stations; According to the actual voltage of each in-station bus, judging the energy supply and demand state of the corresponding in-station bus; Based on the matching relation between the power supply state and the energy supply and demand state, the actual voltage of the bus in the station is adjusted in a corresponding voltage domain through droop control.
2. The flexible full-automatic grid-connected control method of the multi-station power grid according to claim 1, wherein the power supply demand state comprises a global surplus state and a global shortage state, and the voltage domain corresponding to the energy supply demand state comprises an in-station self-power state, an in-station power supply supplementing state, an in-station power taking state and an in-station energy storage state.
3. The flexible fully-autonomous grid-connected control method of the multi-site power grid of claim 2, wherein the matching relationship comprises that the global surplus state corresponds to the in-site self-state and the in-site power-taking state, and the global shortage state corresponds to the in-site power-supplementing state and the in-site energy-storing state.
4. A multi-site grid flexible fully autonomous grid-connected control method according to claim 3, characterized in that adjusting the actual voltage of the in-site bus in the corresponding voltage domain by droop control comprises the steps of: When the bus is in the global surplus state, power of the bus in the station in the self-state is reduced, and the actual voltage of the bus in the station is regulated towards the upper limit direction of the voltage domain in the self-state in the station through droop control; When the bus is in the global surplus state, power of the bus in the station power-taking state is increased, and the actual voltage of the bus in the station is regulated to the lower limit direction of the voltage domain in the station power-taking state through droop control; When the bus is in the global shortage state, power of the bus in the in-station power-up state is increased, and the actual voltage of the bus in the station is regulated towards the lower limit direction of the voltage domain of the in-station power-up state through droop control; and when the bus is in the global shortage state, the power of the bus in the station energy storage state is increased, and the actual voltage of the bus in the station is regulated towards the lower limit direction of the voltage domain of the station energy storage state through droop control.
5. A flexible full-autonomous grid-connected control system of a multi-station power grid is characterized by comprising: The sub-power station comprises a power generation unit, an energy storage unit and a load unit and is used for realizing the generation, storage and consumption of electric energy; An inter-station bus for connecting each of the sub-stations and realizing energy mutual utilization; an in-station bus corresponding to the sub-power station and used for connecting the power generation unit, the energy storage unit, the load unit and the inter-station bus; The voltage domain setting module is used for setting a voltage domain of the bus power supply demand state between stations, the voltage domain of the bus energy supply demand state in the stations and storing boundary parameters of each voltage domain; The monitoring module consists of voltage acquisition elements arranged between the bus bars and each bus bar in the station and is used for acquiring and outputting the actual voltages of the bus bars between the stations and each bus bar in the station; The judging module is used for receiving the actual voltage and judging the power supply demand state and the energy supply demand state; and the control module is used for outputting a control signal to the sub power station according to the power supply demand state and the energy supply demand state, and controlling the transmission power of the sub power station.
6. An electronic device, comprising: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.
7. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1-4.
8. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method according to any of claims 1 to 4.

Description

Flexible full-autonomous grid-connected control method and system for multi-station power grid Technical Field The invention belongs to the technical field of grid-connected control, and particularly relates to a flexible full-autonomous grid-connected control method and system for a multi-station grid. Background With the wide application of distributed energy sources (photovoltaic, wind power and the like), a multi-station interconnected power grid becomes an important direction of power system development. However, the existing multi-station power grid control has the following problems that manual intervention or centralized control is relied on, full-automatic control capability is lacked, reliability is insufficient in unattended scenes (such as islands and remote areas), the adjustment mode is rigid, power sudden changes easily impact on power generation and energy storage equipment, the service life of the equipment is shortened, and flexible energy mutual aid is difficult to realize. In order to solve the problems, a set of control schemes with clear voltage domain division, accurate state judgment, logic flexibility adjustment and full-flow autonomy are required to be constructed so as to meet the requirements of stable and efficient operation of the multi-station power grid. Disclosure of Invention In order to solve the technical problems, the invention provides a flexible full-autonomous grid-connected control method and system for a multi-station power grid, which are particularly suitable for flexible parallel connection of the power grid based on unmanned or limited human intervention. The technical scheme adopted by the invention is that in the first aspect, the flexible full-autonomous grid-connected control method of the multi-station power grid is provided, and comprises the following steps: Dividing voltage domains corresponding to different power supply demand states for bus bars among stations in a multi-station power grid; dividing voltage domains corresponding to different energy supply and demand states for buses in the station; Monitoring actual voltages of the inter-station buses and the intra-station buses; Judging the current power supply demand state according to the actual voltage of the bus between stations; According to the actual voltage of each in-station bus, judging the energy supply and demand state of the corresponding in-station bus; Based on the matching relation between the power supply state and the energy supply and demand state, the actual voltage of the bus in the station is adjusted in a corresponding voltage domain through droop control. Further, the power supply demand state comprises a global surplus state and a global shortage state, and the voltage domain corresponding to the energy supply demand state comprises an in-station self-state, an in-station power-supplementing state, an in-station power-taking state and an in-station energy-storing state. Further, the matching relation comprises that the global surplus state corresponds to the in-station spontaneous state and the in-station power-taking state, and the global shortage state corresponds to the in-station power-supplementing state and the in-station energy-storing state. Further, adjusting the actual voltage of the bus bar in the station in the corresponding voltage domain by droop control comprises the following steps: When the bus is in the global surplus state, power of the bus in the station in the self-state is reduced, and the actual voltage of the bus in the station is regulated towards the upper limit direction of the voltage domain in the self-state in the station through droop control; When the bus is in the global surplus state, power of the bus in the station power-taking state is increased, and the actual voltage of the bus in the station is regulated to the lower limit direction of the voltage domain in the station power-taking state through droop control; When the bus is in the global shortage state, power of the bus in the in-station power-up state is increased, and the actual voltage of the bus in the station is regulated towards the lower limit direction of the voltage domain of the in-station power-up state through droop control; and when the bus is in the global shortage state, the power of the bus in the station energy storage state is increased, and the actual voltage of the bus in the station is regulated towards the lower limit direction of the voltage domain of the station energy storage state through droop control. In a second aspect, a flexible fully autonomous grid-connected control system for a multi-site power grid is provided, including: The sub-power station comprises a power generation unit, an energy storage unit and a load unit and is used for realizing the generation, storage and consumption of electric energy; An inter-station bus for connecting each of the sub-stations and realizing energy mutual utilization; an in-station bus corresponding to the sub-power sta