Electric drive system EMC parameter extraction circuit and extraction method thereof

The invention discloses an electric drive system EMC parameter extraction circuit and method, and the method comprises the steps: S1, carrying out the parameter extraction of a motor, so as to obtain a motor differential mode equivalent circuit and a motor common mode equivalent circuit, and S2, carrying out the parameter extraction of a DC/AC module, so as to obtain a DC/AC common mode equivalent circuit and a DC/AC differential mode equivalent circuit. According to the EMC parameter extraction circuit of the electric drive system and the extraction method of the EMC parameter extraction circuit, an improved vector matching method is used for conducting parameter extraction on a motor model, when noise exists and an initial pole is far away from a theoretical value, even if the number of iterations is increased, the situation that an accurate new pole cannot be repositioned possibly occurs in a traditional vector matching method, and therefore the accuracy of the EMC parameter extraction circuit of the elect