This article presents an electrolytic capacitorless (ECL) motor drive based on a dc-split-capacitor converter. In order to decrease the dc-link voltage ripple of ECL motor drive, an active power decoupling circuit (APDC) with a dc-split-capacitor is proposed. The APDC is composed of two converters, among which the boost converter is named the main converter and the buck–boost converter is named the auxiliary converter. The output capacitors of the two converters are connected in series to increase the dc-link voltage, which expands the speed range of the internal permanent magnet synchronous motor. When there is voltage ripple on the capacitor of the main converter, the auxiliary converter will produce complementary voltage on another capacitor. In addition, an instantaneous current control strategy is proposed in the auxiliary converter to reduce the voltage ripple, while the conventional control strategy is applied in the main converter. The main converter can achieve unity power factor, and the auxiliary converter is used to suppress the dc-link voltage ripple. Experiments are conducted, and the results verify the feasibility and effectiveness of the APDC.

中文翻译：

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使用直流分流电容器转换器消除PMSM驱动器中的直流链路电压纹波

本文介绍了一种基于dc-split-capacitor转换器的无电解（ECL）电动机驱动器。为了减少ECL电机驱动器的直流链路电压纹波，提出了一种带有直流分流电容器的有功功率去耦电路（APDC）。APDC由两个转换器组成，其中升压转换器称为主转换器，降压-升压转换器称为辅助转换器。两个转换器的输出电容器串联连接，以增加直流母线电压，从而扩大了内部永磁同步电动机的速度范围。当主转换器的电容器上存在电压纹波时，辅助转换器将在另一个电容器上产生互补电压。此外，在辅助转换器中提出了一种瞬时电流控制策略，以减少电压纹波，而在主转换器中则采用了常规控制策略。主转换器可实现单位功率因数，辅助转换器用于抑制直流母线电压纹波。进行了实验，结果验证了APDC的可行性和有效性。