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Stabilization method of current regulator for electric vehicle motor drive systems under motor parameter mismatch conditions

In this paper, the stability of a current regulator for high-speed motor drives in electric vehicle is analyzed using a motor parameter mismatch model between the current regulator and actual motor parameters. As a result, a fundamental decoupling control which adds the cross terms between d-axis and q-axis to the voltage commands causes instability when the natural angular frequency of a current regulator is low under the motor parameter mismatch. The conventional method requires a low-pass filter (LPF) that has an electrical time constant in order to achieve compensation for the d-q axis coupling components. Therefore, a high carrier frequency is required in order to implement the LPF on the controller. However, it is difficult to implement the LPF because the carrier frequency is limited by the total efficiency of the motor drive systems. Therefore, this paper also proposes a stabilization method for the current regulator based on an equivalent resistance gain in order to overcome this instability problem. One of the features in the proposed method is no use of the LPF. In addition, the proposed method reduces the current overshoot by 1.1 p.u. compared with the fundamental decoupling control.