提出一种双接地单相可升降压非隔离光伏并网逆变器。该逆变器通过共用直流侧电感和交流侧电感电容将Zeta变换器和Cuk变换器组合在一起,构成双接地拓扑结构,具有升降压能力,且可适应宽范围变化的直流输入电压。该逆变器的双接地结构能完全消除漏电流,保证了系统的可靠性和安全性。此外,该逆变器无电解电容,具有体积小、成本低、效率高和寿命长等优点。详细阐述了逆变器的工作原理、升降压能力及调制策略。基于理论分析,完成该逆变器升降压、扰动以及并网控制的仿真和实验,结果良好且与理论分析一致。
Abstract
A dual-grounded single-phase non-isolated grid-connected photovoltaic inverter capable of Buck-Boost operation is proposed in this paper. The inverter combines a Zeta converter and a Cuk converter by utilizing a shared DC-side inductor and an AC-side inductor and capacitor to form a dual-ground topology,which has the ability to Buck-Boost,and can adapt to a wide range of DC input voltage variations. The dual-grounding topology achieves complete suppression of parasitic leakage current, thereby enhancing system operational integrity and safety compliance. The inverter,devoid of electrolytic capacitors,is characterized by its compact size, low cost, high efficiency,and extended lifespan. The working principle, Buck-Boost capability,and modulation strategy of the inverter are detailed in this paper. Based on theoretical analysis,the simulation and experiment of the inverter's Buck-Boost operation, disturbance,and grid-connected control have been successfully completed,with results that are satisfactory and consistent with the theoretical analysis.
关键词
电力逆变器 /
漏电流 /
升降压变换器 /
双接地拓扑
Key words
electric inverters /
leakage currents /
Buck-Boost converter /
dual-grounded topology
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基金
国家自然科学基金（51677162）; 河北省自然科学基金（E2017203235）
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