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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 multi-DC additional controller modulation signal selection method is proposed. First of all, we use left analytic method to select those wide-area signals which have the best observability for the target mode and form the paired modulation signal scheme with the input signal at the setting point of DC current. Secondly, for each modulation signal scheme, using the relative gain matrix gain array (RGA) method to quantitatively examine the interaction between multi-DC additional control circuits. Then based on the quantitative results analyzed by RGA method, the optimal DC additional modulation signal is selected according to the characteristics of RGA for a given control point. Because RGA calculation is based on the residue analysis, the selection method of this modulation signal can effectively reduce the calculation and shorten the selection process. Finally, the correctness and validity of this method are verified by a case study of China Southern Power Grid.