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首页> 外文期刊>Power Electronics, IET >Single-stage AC module with series power decoupling capability for connecting PV to a single-phase power grid
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Single-stage AC module with series power decoupling capability for connecting PV to a single-phase power grid

机译：具有串联电源解耦功能的单级交流模块，用于将PV连接到单相电网

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摘要

In single-phase grid-connected photovoltaic inverters, the input power is constant during the grid period, whereas the output power oscillates at double-line frequency. Therefore, electrolytic capacitors are widely used to handle the input and output power differences. However, these capacitors have short lifetime which degrade the inverter reliability. This paper proposes a control strategy to turn a conventional four-switch flyback-based inverter to an inverter equipped with a series power decoupling circuit. Therefore, a long lifetime film capacitor can be used as the main energy storage. The modified inverter has an inherent snubber circuit, which can restore energy of the transformer leakage inductance and improves its overall efficiency. The control strategy can realise maximum power point tracking and inject a sinusoidal low total harmonic distortion current to the grid. A 100 W prototype inverter has been built to verify operation and feasibility of the proposed control strategy.
机译：在单相并网光伏逆变器中，在电网周期内输入功率恒定，而输出功率则以双线频率振荡。因此，电解电容器被广泛用于处理输入和输出功率差异。然而，这些电容器的寿命短，这降低了逆变器的可靠性。本文提出了一种控制策略，将传统的基于四开关反激式的逆变器转换为配备了串联电源去耦电路的逆变器。因此，可以将长寿命的薄膜电容器用作主要的能量存储。改进的逆变器具有固有的缓冲电路，可以恢复变压器漏感的能量并提高其整体效率。该控制策略可以实现最大功率点跟踪，并向电网注入正弦形的低总谐波失真电流。已经建造了一个100 W的原型逆变器，以验证所提出的控制策略的运行和可行性。

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