计及储能协同控制的光伏场站快速备自投方案

doi:10.19595/j.cnki.1000-6753.tces.250184

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Abstract

The traditional automatic bus transfer equipment (referred to as “automatic switching device”) to check the “no voltage on the bus, no current on the incoming line” as the starting criterion, resulting in new energy power station to disconnect new energy as a prerequisite for automatic switching device action, reducing the new energy utilization rate and reliability of power supply. Therefore, it is of great significance to realize the reliable action of automatic switching device without disconnecting new energy. To solve the above problems, we utilize the energy storage equipped in the photovoltaic power station and adopt the control of the virtual synchronous generator (VSG). Based on considering the different matching degrees of the source-load power and the action timing relationship of each module, a fast standby automatic switching scheme considering the energy storage collaborative control is proposed.
Firstly, the mechanism of voltage and frequency change at the point of common coupling under different source-load power matching degrees after the working power supply is disconnected is analyzed, revealing that the key to suppressing the automatic switching device impulse current is the rapid realization of power balance control. Secondly, it is designed and proposed that using energy storage VSG control to suppress voltage/frequency fluctuations during islanding detection. After the islanding detection is completed, the refined power balance is further achieved by the coordinated cooperation of adjusting the energy storage VSG power command and inputting crowbar resistor or shedding load, thus the fast and reliable action of automatic switching device is realized within 100 milliseconds. Finally, based on the typical topology of photovoltaic power stations, we use MATLAB/Simulink to construct the corresponding electromagnetic transient simulation model, and a large number of simulation experiments are carried out to verify the feasibility and effectiveness of the proposed scheme.
Simulation results of the proposed standby automatic switching scheme show that it can rapidly achieve refined power balance between the power source and the load during the power balance stage under the working conditions where the power source is greater than the load, the power source is less than the load, and the power source and the load are approximately balanced. Thereby, it enables the rapid and reliable switch-on of the standby power source. When further taking into account the fluctuations of the standby power source within the range permitted by the power grid in actual working conditions, this scheme can also keep the inrush current coefficient within the requirements of the power grid during the switch-on of the standby power source.
The following conclusions can be drawn from the theoretical analysis and the simulation verification: (1) To realize the fast automatic standby power switching of new energy stations under the premise of not disconnecting new energy, it is mainly necessary to solve the fast and effective control of source-load unbalanced power and the suppression of closing impulse current. (2) On the basis of considering the different matching degrees of source-load power and the timing relationship of each module, a power balance scheme is proposed that takes into account the energy storage VSG control, the crowbar resistor and load shedding. In the islanding detection stage, the energy storage VSG can compensate for the unbalanced power to a certain extent and suppress the fluctuation of system voltage and frequency. After the islanding detection is completed, the collaborative control of adjusting the energy storage VSG power command and inputting the crowbar resistor/shedding load are to realize the active power balance of solar-storage-load. It ensures the fast and reliable action of automatic switching device.

Key words： Photovoltaic power station automatic switching device energy storage virtual synchronous generator cooperative control

Received: 03 February 2025

PACS:

TM762.1

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	Zheng Tao
	Ma Ying
	You Yi
	Hu Shengkuan

Cite this article:

Zheng Tao,Ma Ying,You Yi等. A Fast Standby Automatic Switching Scheme for Photovoltaic Power Station Considering Energy Storage Cooperative Control[J]. Transactions of China Electrotechnical Society, 0, (): 250442-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250184 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/250442

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