A Zero-Voltage-Transition HERIC-Type Transformerless Photovoltaic Grid-Connected Inverter
A Zero-Voltage-Transition HERIC-Type Transformerless Photovoltaic Grid-Connected Inverter
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DOI：
10.1109/tie.2016.2611574
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发表时间：
2017-02
影响因子：
7.7
通讯作者：
Huafeng Xiao;Li Zhang;Yanqing Li
中科院分区：
文献类型：
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作者：
Huafeng Xiao;Li Zhang;Yanqing Li
一个零电压过渡的高效和可靠的逆变器概念（ZVT-HERIC）在无变压器光伏并网应用是从建议的基本谐振单元。通过集成谐振回路和续流开关，设计了一个紧凑的谐振网络，使高频主开关的开关过渡软化。通过采用二极管箝位方案，ZVT-HERIC的续流回路的电势被抑制在输入电压的一半上，并限制漏电流。该逆变器具有ZVT软开关、二极管反向恢复抑制、低dv/dt的单极差模电压和恒定共模电压等优点。推导出的逆变器的稳态运行进行了分析，并讨论了电路性能，探讨软开关区域，电压增益，以及电压和电流应力。最后，从一个3千瓦的原型在100 kHz的开关频率的实验结果，以验证派生逆变器的有效性。
A zero-voltage-transition highly efficient and reliable inverter concept (ZVT-HERIC) in transformerless photovoltaic grid-connected applications is derived from proposed basic resonant cells. By integrating resonant tanks and freewheeling switches, a compact resonant network is originated to make the switching transitions of high-frequency main switches softening. By utilizing the diode clamping scheme, the potential of the freewheeling loop of the ZVT-HERIC is suppressed on half of the input voltage and to restrict the leakage current. The derived inverter has the advantages of ZVT soft-switching, diode reverse-recovery alleviating, unipolar differential-mode voltage with low dv/dt, and constant common-mode voltage. The steady-state operation of the derived inverter is analyzed, and the circuit performance is discussed to explore the soft-switching region, voltage gain, as well as voltage and current stresses. Finally, the experimental results from a 3-kW prototype at 100-kHz switching frequency are provided to verify the effectiveness of the derived inverter.