弱电网条件下并网逆变器阻抗协同稳定域辨识

针对基于阻抗方法无法提供系统参数的稳定区域问题，提出了一种弱电网条件下并网逆变器在线阻抗协同稳定域辨识方法。首先构造了小信号稳定禁区和稳定运行区，比现有的三种基于范数的稳定性准则和三种常见的稳定性禁区准则具有更小的保守性。然后通过镜像映射、旋转映射和平移映射将稳定操作子区域转化为可分辨矩阵空间，进一步将协同稳定域的求解转化为等价收益率矩阵特征值全部在左半平面上的可分辨矩阵的条件，另外提出了一种基于Kronecker理论的计算阻抗区域的方法。最后，仿真和实验结果表明，提出的方法是一种更有效、保守性更小的方法，进一步证明了方法的有效性。

Identification Method of Impedance Cooperative Stability Region for Grid Connected Inverter in Weak Current Network

Aiming at the problem that the system parameters could not be provided by the impedance method, an online impedance collaborative stability region identification method for grid connected inverter in weak current network was proposed. Firstly, small signal stability forbidden zone and stable operation zone were constructed, which were less conservative than the existing three norm based stability criteria and three common stability forbidden zone criteria. Then, the stability operation sub region was transformed into a discernible matrix space by means of image mapping, rotation mapping and translation mapping, and the solution of the cooperative stability region was further transformed into the condition that the eigenvalues of the equivalent rate of return matrix were all in the left half plane. In addition, a method for calculating the impedance region based on Kronecker theory was proposed. Finally, simulation and experimental results show that the proposed method is more effective and less conservative, which further proves the effectiveness of the method.