Using the matrix theory, we derived the modal matrices of some parameter matrices in transformation, and discussed the transformation with principle of powerinvariance also.
用矩阵理论求出几种形式的参数矩阵变换时的模态矩阵,并讨论了功率不变原则下的变换。
2
Basing on the signal space model, the harmonics in power system was detected by combining the subspace rotational invariance and least squares method.