Shandong Jianzhu University

Dongjiang Yang

Lei Yang

Xiaoyan Li

Changwei Qin

Zhiyuan Chu

Chuanjing Hou

Han Xu

Chengdong Li

Hongchao Bai

The present invention provides a method for cooperatively suppressing a common-mode voltage and current harmonics of coupled three-level inverters, comprising: based on amplitude and phase angle of reference voltage vector, determining sector and region in which the reference voltage vector is located; selecting four basic voltage vectors with low common-mode voltage amplitudes to synthesize the reference voltage vector; writing volt-second balance equation based on selected basic voltage vectors, and calculating duty cycles thereof; and based on sector and region in which reference voltage vector is located, set value of voltage difference across capacitors on direct current side, and actual value of voltage difference across capacitors on direct current side, (1) updating duty cycles of basic voltage vectors, to realize separate control of capacitor voltage; and (2) designing and converting switching sequence into PWM drive signal of power switch, to control the coupled three-level inverter to operate.

Method and system for cooperatively suppressing common-mode voltage and current harmonics of coupled three-level inverter

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Jinan, China

Dongjiang Yang