Harmonics suppression and common mode voltage control in a high power current source drive system

如今，大功率中压驱动器在工业中变得越来越重要，以降低能耗并提高泵、风扇、牵引电机等的运行效率。这些大功率驱动器在运行过程中通常会受到谐波、谐振和共模电压的影响，这将给驱动器和电机带来额外的应力和损耗。解决这些问题的传统方法是通过无源滤波和减振，这增加了驱动系统的成本、尺寸和重量。 在这项合作研发(CRD)计划中，我们建议研究和开发新的控制和脉宽调制(PWM)策略，以减轻基于大功率电流源的驱动系统中的电气谐振和控制共模电压。所提出的PWM和控制策略有望有效地解决上述问题，提高整体效率和节约能源，同时不涉及驱动系统的额外硬件成本。

Nowadays, high power medium voltage drives are becoming more important in industry to reduce energy losses and increase productivities for the operating of pumps, fans, traction motors, etc. These high power drives typically suffer harmonics, resonance and common mode voltage during their operations, which will introduce additional stress and losses on the drives and the motors. Traditional approach to deal with these problems is through passive filtering and damping which increase the cost, size and weight of a drive system. In this Collaborative Research and Development (CRD) program, we propose to research and develop novel control and pulse-width-modulation (PWM) strategies to mitigate the electrical resonance and control the common mode voltage in a high power current source based drive system. The proposed PWM and control strategies are expected to effectively address the above mentioned problem, improve the overall efficiency and conserve energy, while without involving additional hardware costs in a drive system.