大规模风电并网对电网调频提出了严重挑战。VSC-MTDC(Voltage Source Converter Based Multi-Terminal Direct Current)是实现大规模风电并网的主要方式之一。VSC-MTDC可以通过采用频率下垂控制为交流电网提供辅助调频服务。然而传统频率下垂控制采用固定的控制参数，忽略直流系统运行状态和交流电网的调频能力差异，可能导致换流站过度调制。通过分析传统频率下垂控制的功率支援特性，提出一种VSC-MTDC模糊自适应频率控制，根据交流电网频率变化量、直流电压变化量、换流站功率裕度调节频率控制系数，在保证系统稳定的前提下增强交流电网频率稳定性。最后，仿真验证了所提控制策略的有效性。
Fuzzy Adaptive Frequency Control of VSC-MTDC for Large-scale Integration of Wind Power
The large-scale integration of wind power poses a serious challenge to the power grid frequency modulation.VSC-MTDC(Voltage Source Converter Based Multi-Terminal Direct Current)is one of the main ways to realize the large-scale integration of wind power.VSC-MTDC can provide auxiliary frequency modulation services to the AC power grids by using frequency droop control.However,the traditional frequency droop control adopts a fixed control parameter,without considering the different operating conditions of DC power systems and the frequency modulation capacity of the AC power grids,which may lead to over-modulation of the converter stations.By analyzing the power support characteristics of traditional frequency drooping control,a fuzzy adaptive frequency control of VSC-HVDC is proposed,which regulates the frequency control coefficients according to the frequency deviation of AC power grids,the DC voltage deviation,and the power margin of converter stations.It can enhance the frequency stability of AC power grids in the condition of ensuring the stability of the system.Finally,the simulation verifies the effectiveness of the proposed control strategy.
wind powerVSC-MTDCfrequency droop controlfuzzy adaptive control
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