基于D分割法的LCC-HVDC系统控制器参数整定方法

D-partition Method Based Controller Parameter Setting Method for LCC-HVDC System

高压直流输电系统的控制器参数对系统稳定性及动态响应性能具有重要影响。提出了一种基于D分割法的基于电网换相换流器的高压直流输电(LCC-HVDC)系统控制器参数整定方法。首先,基于某实际工程的运行参数建立了单极全压运行方式下的LCC-HVDC系统等值小干扰动态模型;然后,基于该模型的拉普拉斯变换获得系统定电流控制及定电压控制回路的传递函数;继而,采用D分割法分别对定电流控制器及定电压控制器的比例-积分参数进行整定,获得了同时满足增益裕度、相位裕度及带宽限制要求的控制器参数整定域,并将不同功率传输水平下的参数整定域进行叠加,获得了多工况通用控制器参数域。仿真结果验证了小干扰动态模型的准确性及所提控制器参数整定方法的有效性。

The controller parameters of high voltage direct current(HVDC) transmission systems have an important influence on the system stability and dynamic response performance. This paper proposes a controller parameter setting method for the line commutated converter based high voltage direct current(LCC-HVDC) system based on the D-partition method. Firstly, based on the operation parameters of an actual project, an equivalent small-signal dynamic model of the LCC-HVDC system in the singlepole full-voltage operation mode is established. Then the transfer functions of constant current control and constant voltage control loops are obtained based on the Laplace transform of the model. The D-partition method is used to set the proportional-integral(PI)parameters of the constant current controller and the constant voltage controller, and obtain the controller parameter setting domain that meets the requirements of gain margin, phase margin and bandwidth limitation at the same time. The parameter setting domains at different power transmission levels are superimposed to obtain the multi-condition general controller parameter domain.The simulation results verify the accuracy of the small-signal dynamic model and the effectiveness of the proposed controller parameter setting method.