An Improved Modulation Strategy for the Active Voltage Clamping HERIC Inverter

2019 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2019-03-17 DOI:10.1109/APEC.2019.8722251

Hui Wang, Zhenxi Wu, Zhongting Tang, Hua Han, Yongheng Yang, F. Blaabjerg

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引用次数: 4

Abstract

The active voltage clamping HERIC (AVC-HERIC) inverter can be employed in PV applications due to its high-performance in terms of low leakage currents, high efficiency, and high power density. However, maintaining a high efficiency and good power quality under reactive power injection requires retrofitting the modulation strategies. This paper thus proposes an improved modulation method for the AVC-HERIC topology. The proposed modulation scheme mainly adopts two operation modes to enable the reactive power injection. Moreover, the two operation modes can be switched according to the polarity of the reference voltage. This maintains the efficiency as when the unipolar pulse width-modulation (PWM) strategy is adopted. Additionally, in the region of the minimum pulse width limitation (MPWL), an effective compensation strategy is also proposed in this paper to improve the power quality. Simulations and experiments are performed on a 4-kW AVC-HERIC system, and the results verify the effectiveness of the proposed modulation.

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一种改进的有源箝位HERIC逆变器调制策略

有源电压箝位HERIC (AVC-HERIC)逆变器具有漏电流小、效率高、功率密度高等特点，可应用于光伏领域。然而，在无功功率注入下保持高效率和良好的电能质量需要改进调制策略。因此，本文提出了一种改进的AVC-HERIC拓扑调制方法。本文提出的调制方案主要采用两种工作模式来实现无功功率注入。此外，两种工作模式可以根据参考电压的极性进行切换。这保持了采用单极脉宽调制(PWM)策略时的效率。此外，在最小脉冲宽度限制(MPWL)区域，本文还提出了一种有效的补偿策略来改善电能质量。在一个4kw的AVC-HERIC系统上进行了仿真和实验，结果验证了所提出调制的有效性。

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2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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