相对增益矩阵原理在多直流附加调制信号选取中的应用

Application of Relative Gain Array Principle in Selecting Modulation Signals of Multiple HVDC Supplementary Controllers

提出一种多直流附加控制器调制信号的选取方法。首先利用留数分析法选出那些对目标模式可观性最好的广域信号,与直流电流整定点处的输入信号组成配对调制信号方案;其次针对每种调制信号方案,利用相对增益矩阵(relative gain array,RGA)方法量化地考察多直流附加控制回路间的交互影响程度;而后基于RGA方法分析的量化结果,根据RGA的特性为给定的控制点选取最佳直流附加调制信号。由于是在留数分析的基础上进行RGA计算,因此,这种调制信号选取方法可有效降低计算量和缩短选取进程。最后,通过中国南方电网的算例分析验证该方法的正确性和有效性。

A method for selecting the modulation signals of multiple HVDC supplementary controllers is proposed. First, the wide-area signals with the best observability to the objective modes are selected by using the residue analysis. These signals are paired with the input signals at the setting points of HVDC currents to form various modulation signal schemes. Next, for each modulation signal scheme, the interaction degrees among the multi-HVDC supplementary control loops are quantitatively investigated by use of the relative gain array （RGA） modulation signals for the After that, the optimal HVDC given control points are selected according to the RGA characteristics based on the above quantitative results of the RGA analysis. Because the RGA computation is implemented based on the residue analysis, the proposed method can effectively reduce computational complexity and shorten signal selection process. Finally, the simulation results for China Southern Power Grid verify the validity and efficiency of the method proposed in this paper.