基于内模原理的VSC-HVDC控制方法研究

在d-q同步旋转坐标系下,基于电压源换流器的直流输电系统稳态数学模型中有功电流和无功电流存在耦合,给控制带来困难。为了解决这一困难,笔者在建立了该坐标系下VSC-HVDC数学模型的基础上,介绍了一种基于内模原理的电流解耦策略,给出了理论分析和调节器参数整定算法,并利用MATLAB对控制策略进行了仿真。结果表明,该方法能很好的实现电流的解耦,它只有滤波器时间常数是需要整定的参数,方法比较简单,并且系统特性变化的情况下具有很强的鲁棒性和抗干扰能力。

A VSC-HVDC Control Strategy Based on Internal Mold Principle

In the simultaneously rotary d-q coordinates,the coupling of active and reactive currents in the mathematical model of VSC-HVDC brings about difficulty to control.In order to solve this problem,this paper presented a control strategy of current decoupling using internal mold principle based on the model of VSC-HVDC,and provided theoretical analysis and a parameter setting algorithm.Moreover,the proposed strategy was simulated by MATLAB.The results verifies that the method can implement decoupling control of current,and is simple because only time constant of the filter needs to be adjusted.This method shows high robustness and enhanced anti-interference capacity under variation of system characteristics.