Hybrid PWM Strategy of SVPWM and VSVPWM for NPC Three-Level Voltage-Source Inverter
Hybrid PWM Strategy of SVPWM and VSVPWM for NPC Three-Level Voltage-Source Inverter
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DOI：
10.1109/tpel.2010.2041254
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发表时间：
2010-10
影响因子：
6.7
通讯作者：
Weidong Jiang;Shao-wu Du;Liu Chang;Yi Zhang;Qing Zhao
中科院分区：
文献类型：
--
作者：
Weidong Jiang;Shao-wu Du;Liu Chang;Yi Zhang;Qing Zhao
中点电压漂移是NP箝位三电平逆变器的主要技术缺陷。传统的空间矢量脉宽调制（SVPWM）无法控制NP电压以实现高调制指数和低功率因数。虚拟空间矢量脉宽调制（VSVPWM）能够在全调制指数和全功率因数下控制NP电压。然而，这种调制策略比SVPWM更复杂，增加了开关频率，并且恶化了逆变器的输出波形。提出了一种新的PWM概念，包括NP电压平衡条件。在此基础上，提出了一种同时使用SVPWM和VSVPWM的混合调制方案，用于NPC三电平逆变器中NP电压的完全控制。通过仿真和实验验证了这种新的调制方法的性能及其优于SVPWM和VSVPWM的优点。
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.