Hybrid PWM Strategy of SVPWM and VSVPWM for NPC Three-Level Voltage-Source Inverter

作者：Jiang, Wei-dong^*; Du, Shao-wu; Chang, Liu-chen; Zhang, Yi; Zhao, Qin

来源：IEEE Transactions on Power Electronics, 2010, 25(10): 2607-2619.

DOI：10.1109/TPEL.2010.2041254

• Hybrid pulsewidth modulation (PWM)
• neutral-point (NP) clamped (NPC)
• space vector pulsewidth modulation (SVPWM)
• three-level inverter
• virtual SVPWM (VSVPWM)

Neutral-point (NP) voltage drift is the main technical drawback of NP-clamped (NPC) three-level inverters. Traditional space vector pulsewidth modulation (SVPWM) is incapable of controlling the NP voltage for high modulation indexes and low power factors. Virtual SVPWM (VSVPWM) is capable of controlling the NP voltage under full modulation indexes and full power factors. However, this modulation strategy is more complex than SVPWM, increases the switching frequency, and deteriorates the output waveforms of the inverter. A novel PWM concept that includes NP voltage-balancing conditions is proposed. Based on this concept, a hybrid modulation scheme that uses both SVPWM and VSVPWM is presented for complete control of the NP voltage in NPC three-level inverters. The performance of this new modulation approach and its benefits over SVPWM and VSVPWM are verified by simulation and experiments.

• 出版日期2010-10
• 单位合肥工业大学