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首页> 外文期刊>Power Electronics, IET >Coupled inductance design for grid-connected photovoltaic inverters
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Coupled inductance design for grid-connected photovoltaic inverters

机译：光伏并网逆变器的耦合电感设计

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The coupled inductor with larger inductance is beneficial to improve the inverter output current quality but instead of causing additional power loss due to the increased series parasitic resistance. Conversely, once the inductance is turned down, the part of the filter power loss caused by the growing ripple current becomes gathering. To clarify the ratio of the ripple and fundamental current on the coupled inductor power loss, a generalised algebraic formula based on the LC filter model is presented to predict the ripple current magnitude at specific fundamental current in each switching cycle. The coupled inductor power loss contributed by the ripple current and the fundamental current can be, respectively, predicted under various inductances and thus in favour of choosing appropriate inductor parameter for power efficiency optimisation. Although this approach is derived based on the LC filter, it is also available for the LCL filter by using the model reduction technique. A guideline of a unity inductance split factor for the LCL filter is proven with maximum fundamental current gain and is adopted for choosing the grid-side and inverter-side inductances of the LCL filter in this study. Experimental results from various ratings of the grid-tied single phase inverter validate the feasibility of the proposed strategy with satisfactory power efficiency.
机译：具有较大电感的耦合电感器有利于改善逆变器输出电流质量，但不会因串联寄生电阻增加而引起额外的功率损耗。相反，一旦电感降低，由不断增加的纹波电流引起的部分滤波器功率损耗将逐渐聚集。为了阐明纹波和基波电流在耦合电感器功率损耗上的比率，提出了一种基于LC滤波器模型的通用代数公式，以预测每个开关周期中特定基波电流下的纹波电流幅值。可以分别在各种电感下预测由纹波电流和基波电流引起的耦合电感器功率损耗，因此有利于选择适当的电感器参数以优化功率效率。尽管此方法是基于LC滤波器得出的，但也可以通过使用模型简化技术将其用于LCL滤波器。 LCL滤波器的单位电感分流系数指南已被证明具有最大的基本电流增益，并且在本研究中被用于选择LCL滤波器的电网侧和逆变器侧电感。并网单相逆变器各种额定值的实验结果证明了所提出策略具有令人满意的功率效率的可行性。

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