Abstract：The four-switch three-phase inverter (FSTPI) is the post-fault reconfigured topology for the two-level inverter with single-leg failure. In order to enhance the DC-link voltage of FSTPI, a space vector pulse-width modulation (SVPWM) algorithm in the over-modulation region is proposed. It divides the over-modulation region of FSTPI into over-modulation mode Ⅰ region, over-modulation mode Ⅱ region and over-modulation mode Ⅲ region depending on the modulation index. In order to reveal the relationship between SVPWM and carrier-based pulse-width modulation (CBPWM) algorithm of FSTPI, the equivalent carrier-based modulating functions of SVPWM in these three over-modulation modes are derived respectively, based on the PWM regular sample method. The change rules of the equivalent carrier-based modulating functions in the full modulation region are summarized with the modulation index changing afterwards. Theoretical analysis shows that the SVPWM of FSTPI is a special type of CBPWM algorithm in the full modulation region. Simulation and experimental results verify the theoretical analysis.
刘勇超, 葛兴来, 蒲俊楷, 唐启迪. 四开关三相逆变器全调制度范围内两种等效PWM算法[J]. 电工技术学报, 2017, 32(2): 206-215.
Liu Yongchao, Ge Xinglai, Pu Junkai, Tang Qidi. Two Types of Equivalent PWM Algorithms in the Full Modulation Region for Four-Switch Three-Phase Inverter. Transactions of China Electrotechnical Society, 2017, 32(2): 206-215.
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2017, Vol. 32 
