基于VSC-MTDC系统的改进多点直流电压控制策略

Improved Multi-Point Direct Current Voltage Control Strategy Based on Voltage Source Converter-Multi-Terminal Direct Current

针对多端直流输电系统定电压控制方式的不足,提出了考虑系统启动之初和大幅功率变动时的改进多点直流电压控制策略,并搭建了含等效海上风电场的多端直流输电系统,利用MATLAB/Simulink在多种扰动和故障运行工况下进行了仿真分析。仿真结果表明,该控制策略具有较好的响应速度、精度和稳定性,能够实现系统换流站间的稳定运行。

Aiming at the constant voltage control method for multi-terminal direct current(DC)transmission systems,this paper proposed to improve the multipoint DC voltage control strategy considering the time of first system booting and sharp power fluctuation and established the multipoint DC transmission system equivalent to the offshore wind plant.Simulink in MATLAB was used to carry out simulation and analysis under a variety of disturbance and malfunction operation condition.Simulation results show that the control strategy has good response speed,precision and stability,and can achieve stable operation of the converter stations.