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Quasi-resonant DC-link H5 PV inverter

机译：准谐振直流母线H5光伏逆变器

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摘要

By removing transformer from PV inverters, they become more attractive for distributed power generation systems. Regardless of their some extra leakage currents, transformer-less inverters would be more advantageous regarding their higher efficiency. However, using traditionally hard-switching converters still causes to drastic switching losses, high dd and electromagnetic interference. Quasi-resonant DC-link techniques have promising features to provide zero-voltage switching (ZVS) condition for full bridge inverters, but they are not suitable for transformer-less PV inverters due to consequent high leakage current. In this study, a transformer-less PV inverter is proposed by adapting a proper quasi-resonant DC-link technique to the H5 topology. Using only two auxiliary switches, ZVS turn on and turn off for high-frequency bus switch and ZCS turn on and ZVS turn off for high-frequency switches of the bridge as well as ZVS turn on and turn off of the antiparallel diodes of main switches are realised. Zero current switching (ZCS) turn on and ZVS turn off for auxiliary switches and ZVS turn on and ZCS turn off for antiparallel diodes are also provided. To verify the proposed circuit operation, a 20 kHz 1 kW quasi-resonant DC-link H5 PV inverter prototype is implemented and operation characteristics, soft switching conditions and design rules are confirmed.
机译：通过从光伏逆变器中移除变压器，它们对分布式发电系统更具吸引力。不管它们有多少额外的泄漏电流，无变压器逆变器在其更高的效率方面都将更加具有优势。但是，使用传统的硬开关转换器仍然会导致巨大的开关损耗，高dd和电磁干扰。准谐振直流链路技术具有为全桥逆变器提供零电压开关（ZVS）条件的有前途的功能，但由于随之而来的高泄漏电流，它们不适用于无变压器的PV逆变器。在这项研究中，通过将适当的准谐振直流链路技术应用于H5拓扑，提出了一种无变压器的PV逆变器。仅使用两个辅助开关，ZVS打开和关闭以用于高频总线开关，ZCS打开，ZVS关闭以用于桥式高频开关，以及ZVS打开和关闭主开关的反并联二极管被实现。还提供了用于辅助开关的零电流开关（ZCS）打开和ZVS关断，以及用于反并联二极管的ZVS打开和ZCS关断。为了验证拟议的电路操作，实现了一个20 kHz 1 kW准谐振直流母线H5 PV逆变器原型，并确定了工作特性，软开关条件和设计规则。

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