For general household appliances with large inertia, such as air conditioning compressor, the control system does not require high speed accuracy of motor control. In order to reduce the cost and volume of the controller, reducing the DC-link capacitance within a reasonable range has been paid more and more attention. In this paper, the permanent magnet synchronous motor (PMSM) drive system with reduced capacitance is studied. Aiming at the DC-link voltage fluctuation caused by reducing the capacitance, a voltage fluctuation suppression strategy is proposed, which transfers the DC side oscillation energy to the motor side. The proposed method adopts the sampled DC-link voltage to control the motor to suppress the power fluctuation on DC-link. At the same time, to ensure the suppression effect, a preprocessing of over-modulation strategy without changing the output power is proposed also. The experimental results of 220 μF and 110 μF as DC-link capacitance verify the effectiveness of the proposed control method.

对于惯性较大的一般家用电器，例如空调压缩机，控制系统不需要电动机控制的高速精度。为了降低控制器的成本和体积，将直流链路电容减小在合理范围内已受到越来越多的关注。本文研究了一种减小电容的永磁同步电动机（PMSM）驱动系统。针对减小电容引起的直流母线电压波动，提出了一种抑制电压波动的策略，将直流侧的振荡能量传递给电机侧。所提出的方法采用采样的直流母线电压来控制电动机，以抑制直流母线上的功率波动。同时，为了确保抑制效果，还提出了在不改变输出功率的情况下对过调制策略进行预处理的方法。220μF和110μF作为直流母线电容的实验结果证明了该控制方法的有效性。