CN-122026476-A - New energy base source storage self-adaptive cooperative control method and related equipment

CN122026476ACN 122026476 ACN122026476 ACN 122026476ACN-122026476-A

Abstract

The embodiment of the application provides a new energy base source storage self-adaptive cooperative control method and related equipment, and belongs to the technical field of power system control. The application provides a cooperative control mechanism, which is characterized in that in the fault, a grid-following type new energy station adaptively and rapidly reduces active output through a concave function load shedding strategy according to the voltage rising degree of a grid-connected point, and enhances reactive power absorption capacity through dynamically supplementing reactive current, and meanwhile, a grid-following type energy storage system adopts a buffer function according to the frequency change rate and deviation And the moment of inertia and the damping coefficient of the virtual synchronous control of the self-adaptive smooth adjustment device are adjusted in a self-adaptive manner, so that the transient support performance is improved. The application effectively inhibits transient overvoltage, stabilizes frequency oscillation and shortens system recovery time by cooperation and optimization of control of the source and the storage sides on the premise of not depending on an alternating current energy consumption resistor, and provides an economic and reliable solution for safe and stable operation of a new energy base flexible direct-delivery system.

Inventors

Gong hancheng
GUAN LIN
YANG ZIQIAN
LI YAN
ZHOU BAORONG
Tang Wangqianyun
ZHANG YE

Assignees

华南理工大学
南方电网科学研究院有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260121

Claims (10)

1. The self-adaptive cooperative control method for the new energy base source storage is characterized in that the new energy base comprises at least one network-following new energy station and at least one network-constructing energy storage system, and the method comprises the following steps: And when the direct current blocking fault of the flexible direct current output system is detected, executing source-storage transient cooperative control, wherein: The source-storage transient cooperative control comprises source side control and storage side control; The source side control includes: According to the grid-connected Point (PCC) voltage of the grid-following type new energy station ) Adaptively reducing the active power output of the grid-following new energy station, and According to the PCC voltage [ ] ) The rising degree of the following net type new energy station is adaptively increased; The reservoir side control includes: According to the frequency change rate of the network-structured energy storage system in the transient process ) And frequency deviation ) And adaptively adjusting virtual synchronous control parameters of the network-structured energy storage system, wherein the virtual synchronous control parameters comprise virtual moment of inertia (J) and damping coefficient (D).
2. The method of claim 1, wherein said adaptively reducing the active power output of said heel mesh new energy station comprises: According to the PCC voltage [ ] ) And the preset load shedding function ) Calculating to obtain the active power load shedding rate ); Load shedding rate based on the active power ) And steady state active power before failure ) Determining the reference value of the active power after load shedding ); According to the reference value of the active power after load shedding ) D-axis voltage measured currently [ ] ) Voltage of q-axis ) And q-axis current [ ] ) Calculating and updating d-axis current reference value of the grid-following new energy station )。
3. The method according to claim 2, wherein the load shedding function # ) At the PCC voltage [ ] ) In the range of 1.1 p.u. to 1.3 p.u., configured as a strict concave function, the following condition is satisfied: When (when) In the time-course of which the first and second contact surfaces, ; When (when) In the time-course of which the first and second contact surfaces, ; When (when) In the time-course of which the first and second contact surfaces, 。
4. The method of claim 1, wherein said adaptively increasing reactive power absorbed by said heel mesh new energy station comprises: According to the PCC voltage [ ] ) And a preset voltage threshold value ) And determining the reactive current proportionality coefficient ); Based on the reactive current proportionality coefficient ) And q-axis current reference value under normal working condition ) Calculating to obtain supplementary reactive current reference value ); The supplementary reactive current reference value is calculated ) Superimposed to the q-axis current reference value generated by the fixed ac voltage outer loop ) The total q-axis current reference value of the grid-following new energy station is updated )。
5. The method of claim 4, wherein the reactive current scaling factor ) And% ) In proportion, so that the grid-connected new energy station absorbs more reactive power when the overvoltage is more serious.
6. The method of claim 1, wherein the adaptively adjusting virtual synchronization control parameters of the networked energy storage system comprises: When the frequency change rate is [ ] ) Exceeding a first preset dead zone ) At the time, according to the buffer function ) Smoothing the frequency change rate and adaptively increasing the virtual moment of inertia (J) based on the result of the smoothing; when the frequency deviation is [ ] ) Exceeding a second preset dead zone ) When, the damping coefficient (D) is adaptively increased according to the frequency deviation.
7. The method according to claim 6, characterized in that the virtual moment of inertia (J) is adjusted according to the following formula: Wherein J 0 is the initial moment of inertia of the net-structured energy storage, The frequency difference obtained for the net energy storage active loop, 、 In order to adjust the coefficient of the power supply, A switching signal for controlling the switching.
8. The method according to claim 6, characterized in that the damping coefficient (D) is adjusted according to the following formula: wherein D 0 is the initial moment of inertia of the net-structured energy storage, For adjusting the coefficient; A switching signal for controlling the switching.
9. An electronic device comprising a memory storing a computer program and a processor implementing the method of any of claims 1 to 8 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method of any one of claims 1 to 8.

Description

New energy base source storage self-adaptive cooperative control method and related equipment Technical Field The application relates to the technical field of power system control, in particular to a new energy base source storage self-adaptive cooperative control method and related equipment. Background In large new energy bases built in western deserts, gobi and desert areas of China, flexible direct current transmission technology based on modularized multi-level converters (Modular Multilevel Converter, MMC) is generally adopted to remotely send electric energy to a load center. Such outgoing systems often lack sufficient synchronous power support or are in weak communication with the main network, and therefore, the outgoing flexible direct current converter stations often employ a grid-built control mode (e.g., virtual synchronous generator control, VSG) to provide the necessary voltage and frequency support for the system. In such systems, the dc monopolar lockout fault is one of the greatest risks threatening safe and stable operation. After the fault occurs, the power transmission of the fault pole is interrupted, and the transmission end alternating current system generates thousands of megawatts of instantaneous power surplus before the stabilizing control device acts to cut off part of the new energy unit, so that the voltage of the transmission end alternating current bus is rapidly increased, serious transient overvoltage is generated, and the large-scale new energy unit is possibly disconnected, and even the system is crashed. At present, the main scheme for solving the problem in engineering is to configure a high-capacity alternating current energy dissipation resistor at a transmitting end alternating current bus, consume surplus power by rapidly putting the resistor into operation, and realize fault ride-through by combining measures such as a cutting machine. However, the scheme has the obvious defects that the high-capacity energy-consumption resistor is high in manufacturing cost and large in occupied area, can not run for a long time when being used as short-time emergency equipment, and has the risk of overheat burnout if the power of a source side is not reduced in time, so that the scheme is a passive energy consumption mode and is poor in economical efficiency. Therefore, a new control method is needed to be proposed that is independent of or reduces the dependence on the ac power consumption resistor, and can actively utilize the existing power supply and energy storage regulation capability in the system, cooperatively suppress the transient overvoltage and accelerate the recovery of the system. Disclosure of Invention The embodiment of the application mainly aims to provide a new energy base source storage self-adaptive cooperative control method, electronic equipment, a storage medium and a program product, which can coordinate control actions of a network-following new energy station and a network-constructing energy storage system when a direct current blocking fault occurs, so that the new energy station actively and rapidly reduces active output and enhances reactive power absorption, and simultaneously, the energy storage system self-adaptively optimizes transient support parameters of the energy storage system, thereby effectively inhibiting transient overvoltage of the system, improving frequency stability and shortening fault recovery time on the premise of not depending on a high-capacity alternating current energy consumption resistor. In order to achieve the above objective, an aspect of the embodiments of the present application provides a method for adaptive cooperative control of storage of new energy base, where the new energy base includes at least one heel-net type new energy station and at least one net-structured energy storage system, and the method includes the following steps: And when the direct current blocking fault of the flexible direct current output system is detected, executing source-storage transient cooperative control, wherein: The source-storage transient cooperative control comprises source side control and storage side control; The source side control includes: According to the grid-connected point voltage of the grid-following type new energy station Adaptively reducing the active power output of the grid-following new energy station, and According to the PCC voltageThe rising degree of the following net type new energy station is adaptively increased; The reservoir side control includes: According to the frequency change rate and the frequency deviation of the network-structured energy storage system in the transient process, the virtual synchronous control parameters of the network-structured energy storage system are adaptively adjusted, wherein the virtual synchronous control parameters comprise virtual moment of inertia J and damping coefficient D. In some embodiments, the adaptively reducing the active power output of the grid-follo