Online Estimation of DC-Link Capacitance for Permanent Magnet Synchronous Motor Drive with Reduced DC-Link Capacitor

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society Pub Date : 2021-10-13 DOI:10.1109/IECON48115.2021.9589375

B. Zhou, Gaolin Wang, Runfeng Gao, Guoqiang Zhang, Nannan Zhao, Dianguo Xu

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Abstract

In order to avoid the failure of electrolytic capacitor due to the influence of ambient temperature, film capacitors are applied in the DC-link of permanent magnet synchronous motor (PMSM) drive systems. In this paper, an online estimation method of DC-link capacitance is proposed for the electrolytic capacitorless motor drive system. The power signals of the drive system are analyzed, and the characteristic frequency of the DC-link capacitance power is determined. The instantaneous capacitor power is obtained by the sampled grid input power and the reconstructed inverter power, which is determined by the DC-link voltage and inverter input current. The components of capacitor power and the result of multiplication of DC-link voltage and its derivative at the expected frequency are obtained to calculate the DC-link capacitance by a band-pass filter. The estimation process can be carried out when the system operates normally, and no additional sensors are required. The experimental results verify the effectiveness of the proposed method.

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减小直流电容的永磁同步电机驱动直流电容在线估计

为了避免电解电容因环境温度的影响而失效，将薄膜电容应用于永磁同步电机驱动系统的直流环节。针对无电解电容电机驱动系统，提出了一种直流链路电容在线估计方法。分析了驱动系统的电源信号，确定了直流电容电源的特征频率。电容瞬时功率由采样后的电网输入功率和重构后的逆变器功率得到，由直流链路电压和逆变器输入电流决定。通过带通滤波器计算直流电容，得到电容功率的组成和直流电压及其导数在期望频率下的乘积。估计过程可以在系统正常运行时进行，不需要额外的传感器。实验结果验证了该方法的有效性。

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IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

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