基于遗传算法的VSC-HVDC控制系统PI参数优化

摘要

This paper proposes an approach to the optimization of the parameters of the proportional-integral (PI) compensators in the various external loops of a VSC-HVDC transmission system using a direct current control strategy.Setting models of parameters in external loops are established.The optimized parameters are calculated using genetic algorithm based on the PI controllers' initial values under ITAE (integral of time multiplied by the absolute value of error) criteria.The validity of the optimization method is verified in a detailed electromagnetic transient(EMT) model of the VSC-HVDC model in PSCAD.The simulation results show that the proposed method in this paper has good effects and high computational efficiency.%针对采用直接电流控制策略的电压源换流器(voltage source converter,VSC)控制系统比例积分(PI)参数难以选取的问题,提出了一种优化外环PI控制器参数的方法.首先建立解耦后的外环参数整定模型,然后基于时间乘绝对误差积分(integral of time multiplied by the absolute value of error,ITAE)准则构造PI参数优化的性能泛函,针对此最优控制模型的特点,论文采用遗传算法进行求解,在PSCAD搭建VSC-HVDC模型进行仿真验证.