多端柔性直流输电线路过电压抑制仿真

Overvoltage Suppression Simulation of Multi-terminal Flexible HVDC Transmission Line

针对传统过电压抑制方法不适用于多端柔性直流输电线路,存在抑制效果不明显问题,提出多端柔性直流输电线路过电压抑制方法。以多端柔性直流输电线路的具体参数为依据,构建多端柔性直流输电线路模型,利用线路末端因数控制恒功率模式,实现多端柔性直流输电线路的稳态无功补偿,构建可控电抗器降压补偿系统,降低多端柔性直流输电线路的工频电压,在多端柔性直流输电线路中接入氧化物金属避雷器,完成输电线路的过电压抑制。为证明研究方法的过电压波动抑制性能较强,将所提方法与传统方法对比,实验结果证明上述方法的波动抑制性能优于传统输电线路过电压抑制方法,更适合应用于多端柔性直流输电线路的过电压控制中,为研究提供新的方向。

At present,traditional over-voltage suppression methods are not suitable for multi-terminal DC transmission line,and the suppression effect is not obvious.Therefore,an over-voltage suppression method for multi-terminal flexible DC transmission lines was proposed.Based on specific parameters of multi-terminal flexible DC transmission lines,we built the model of multi-terminal flexible DC transmission line and used the terminal factors of line to control the constant power mode,so as to realize the static reactive compensation.Furthermore,we constructed the step-down compensation system of controlled reactor to reduce the power frequency voltage of multi-terminal flexible DC transmission line.Finally,we put the metal oxide arrester into multi-terminal flexible DC transmission line,and thus to complete the overvoltage suppression.In order to prove the ability of overvoltage fluctuation suppression,the proposed method was compared with traditional methods.Simulation results prove that the suppression performance of the proposed method is better than that of the traditional method,so this method is more suitable for the overvoltage control in flexible multi-terminal DC line,which provides a new direction for this field of research.