Abstract This paper proposes a photovoltaic power conversion topology (PVPCT). The proposed PVPCT is connected to the utility grid, a PV array and emergency loads. The proposed PVPCT comprises a boost DC-DC power converter (DDPC) and a three-port power converter (TPPC). The TPPC has three ports: a DC port, a grid port and an isolated grid port. The input for the boost DDPC is connected to a PV array and the output from the boost DDPC is connected to the DC port of the TPPC. The grid port connects to the utility grid, and the isolated grid connects to emergency loads. The isolated grid port continuously supplies an uninterruptible voltage with constant amplitude and constant frequency for emergency loads, without the need of battery regardless of whether the utility grid is nominal or interrupted in the condition of sunshine. Hence, the proposed PVPCT can continuously supply high-quality uninterruptible power to the emergency loads, such as charger of cell phone during the natural disasters. In addition, the power circuit is simplified and isolating transient is smooth due to the use of TPPC, and the initial cost and maintenance cost are reduced due to no use of battery. The proposed PVPCT has six operation modes for four conditions. A prototype is set-up for validating the performance of proposed PVPCT. The experimental results of the proposed PVPCT have the expected performance.

中文翻译：

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具有并网和离网功能的新型无电池光伏发电系统功率转换拓扑

摘要 本文提出了一种光伏功率转换拓扑（PVPCT）。提议的 PVPCT 连接到公用电网、光伏阵列和应急负载。提议的 PVPCT 包括一个升压 DC-DC 电源转换器 (DDPC) 和一个三端口电源转换器 (TPPC)。TPPC 具有三个端口：DC 端口、电网端口和隔离电网端口。升压 DDPC 的输入连接到光伏阵列，升压 DDPC 的输出连接到 TPPC 的直流端口。电网端口连接公用电网，隔离电网连接应急负载。隔离电网端口为应急负载持续提供恒定幅度和恒定频率的不间断电压，无需电池，无论公用电网是否正常或在日照条件下中断。因此，提出的 PVPCT 可以在自然灾害期间为紧急负载（例如手机充电器）持续提供高质量的不间断电源。此外，由于采用了TPPC，电源电路简化，隔离瞬态平滑，不使用电池降低了初始成本和维护成本。提议的 PVPCT 有四种条件的六种操作模式。建立原型以验证提议的 PVPCT 的性能。所提出的 PVPCT 的实验结果具有预期的性能。由于不使用电池，降低了初始成本和维护成本。提议的 PVPCT 有四种条件的六种操作模式。建立原型以验证提议的 PVPCT 的性能。所提出的 PVPCT 的实验结果具有预期的性能。由于不使用电池，降低了初始成本和维护成本。提议的 PVPCT 有四种条件的六种操作模式。建立原型以验证提议的 PVPCT 的性能。所提出的 PVPCT 的实验结果具有预期的性能。