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Hybrid Improved Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Inverter With Wide Frequency Range
IEEE Transactions on Power Electronics ( IF 6.7 ) Pub Date : 2020-12-29 , DOI: 10.1109/tpel.2020.3047952
Zhan Gao , Qiongxuan Ge , Yaohua Li , Lu Zhao , Bo Zhang , Ke Wang

The three-level neutral-point-clamped inverter used in the variable frequency system has the characteristics of a wide frequency range, and the pulsewidth modulation (PWM) strategy needs to be designed for the low-frequency region with low modulation index and the high-frequency region with low carrier ratio, respectively. The traditional carrier-based PWM (CBPWM) is simple to implement, but in the low-frequency region, CBPWM will cause narrow pulse and output voltage distortion; while in the high-frequency region, CBPWM can only achieve the synchronized modulation with half-wave symmetrical (HWS) and three-phase symmetrical (TPS) waveforms when the carrier ratio is an odd integer multiple of three, and it cannot realize the square-wave modulation. To solve the defects of CBPWM, this article proposes improved CBPWM (ICBPWM) I, which can avoid narrow pulse and generate line voltage accurately at any low modulation index, ICBPWM II, which can ensure the voltage to meet TPS and HWS when the carrier ratio is an arbitrary integer multiple of three, and ICBPWM III, which can achieve square-wave modulation, separately. On this basis, by using ICBPWM I, ICBPWM II, and ICBPWM III in combination, a hybrid ICBPWM strategy with wide frequency range is further proposed. Finally, the proposed strategy is verified by simulation and experiment.

中文翻译:

宽频率范围的三电平中性点钳位逆变器的混合改进基于载波的PWM策略

变频系统中使用的三电平中性点钳位逆变器具有频率范围宽的特点,需要针对调制指数低,频率高的低频区域设计脉宽调制(PWM)策略。载频比低的低频区域。传统的基于载波的PWM(CBPWM)易于实现,但在低频区域,CBPWM会导致窄脉冲和输出电压失真;而在高频区域,当载波比为3的奇数倍数时,CBPWM只能实现半波对称(HWS)和三相对称(TPS)波形的同步调制,并且无法实现平方波调制。为了解决CBPWM的缺陷,本文提出了改进的CBPWM(ICBPWM)I,可以避免窄脉冲并在任何低调制指数下准确产生线电压; ICBPWM II和ICBPWM III可以确保在载频比为3的任意整数倍时满足TPS和HWS的要求。波调制,分别。在此基础上,通过结合使用ICBPWM I,ICBPWM II和ICBPWM III,进一步提出了一种具有宽频率范围的混合ICBPWM策略。最后,通过仿真和实验验证了所提策略的有效性。进一步提出了一种具有宽频率范围的混合ICBPWM策略。最后,通过仿真和实验验证了所提策略的有效性。进一步提出了一种具有宽频率范围的混合ICBPWM策略。最后,通过仿真和实验验证了所提策略的有效性。
更新日期:2020-12-29
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