综合时域和频域性能要求的高压直流控制参数整定方法

Setting Method for Control Parameters of HVDC Based on the Comprehensive Requirements of Time Domain and Frequency Domain Performance

针对目前采用电网换相换流器的高压直流输电工程的比例-积分(proportional integral,PI)控制器参数整定方法中,均使用缺少理论依据的试凑法的局限性,提出了一种高压直流输电系统PI控制器参数整定方法。通过建立高压直流输电系统的线性化状态空间模型,进而得出含有PI控制器参数变量的系统线性化传递函数表达式;接着,利用所求表达式分别求出PI控制器参数对系统时域性能和频域性能的影响结果,得出仅考虑系统时域性能指标或频域性能指标的控制参数整定范围;然后,利用这两个结果得出系统“时域-频域性能指标对应关系”;最后,利用这一关系制定出了适用于高压直流输电系统控制参数整定的稳定裕度。

Aiming at the limitation of using trial-and-touch method which lacks of theoretical basis in setting the proportional integral(PI)controller parameters of HVDC transmission system with line ommutated converters,this paper proposes a PI controller parameter setting method.Firstly,the linearized state space model of HVDC transmission system is established,and then the linearized transfer function expression with PI controller parameter variables is obtained.Next,the influence results of PI controller parameters on time domain performance and frequency domain performance are obtained.The setting range of controller parameters considering only time domain performance index or frequency domain performance index is obtained.Then,using these two results,the time-frequency domain performance correspondence of the system is given.Finally,the stability margin for HVDC control parameter setting is established.