Reactive Voltage Emergency Control Strategy of Wind-Thermal-Bundled DC Transmission System Considering Wind Farm Regulation Margin

doi:10.11930/j.issn.1004-9649.202211016

Abstract

Abstract: In order to suppress the transient overvoltage of direct current (DC) sending-end power grid and make full use of wind power in the power regulation of wind-thermal-bundled DC transmission system, a reactive voltage emergency control strategy considering wind farm regulation margin is proposed. Firstly, the change in the electrical quantity of the wind-thermal-bundled system under commutation failure and the overvoltage mechanism of the DC sending end caused by the failure are analyzed. Secondly, after the commutation failure, the continuous commutation failure of the DC system is suppressed by reducing the DC transmission power. Therefore, the reactive power demand of the system during the fault recovery period is reduced, and the reactive power flow change in the system after the power drop is analyzed. Thirdly, the reactive voltage emergency control strategy of the DC sending end is proposed for the transient high voltage of the sending end caused by surplus reactive power. The reactive power margin of the wind farm is allocated according to the ultra-short-term predicted wind speed, and the wind turbine controller with multiple working modes is designed for different situations. Finally, the simulation results show that the proposed control method can better solve the transient overvoltage problem at the DC sending end of the wind-thermal-bundled DC transmission system.

Key words: wind-thermal-bundled DC transmission, voltage out of limit, adaptive reactive power control strategy, adaptive droop control, active power reduction control

ZHOU Wenjun, CAO Yi, LI Jie, JIN Tao, CHEN Wenjian, ZHOU Xia. Reactive Voltage Emergency Control Strategy of Wind-Thermal-Bundled DC Transmission System Considering Wind Farm Regulation Margin[J]. Electric Power, 2023, 56(4): 77-87.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202211016

https://www.electricpower.com.cn/EN/Y2023/V56/I4/77

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