Among the exiting multifunctional photovoltaic (PV) inverters (MPVIs), the main challenges are low efficiency, undesired harmonic emission, and weak compensation capability. In this article, a theoretical study via rotating phasor to the PV curves is first proposed to figure out the undesired harmonic emission puzzle in different PV inverters as well as to provide the foundation for PV inverters to achieve multifunction ability under varying load conditions. On the other hand, a single-phase time-sharing miniboost MPVI with different operation modes is proposed and operated under varying PV and load conditions in order to improve its efficiency and compensation capability without undesired harmonic emission. Corresponding control strategy and stability analysis are given. Finally, a 1.5-kW prototype is presented, benchmarked against harmonic emission issues, compensation capability, and efficiency. Experimental results clearly indicate that the proposed topology and control method can perform the active power injection and power quality compensation with better efficiency and avoiding harmonic emission into the grid dynamically.

中文翻译：

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具有最大功率点运行和电能质量补偿的户用Miniboost光伏逆变器


现有的多功能光伏逆变器（MPVI）面临的主要挑战是效率低、谐波发射和补偿能力弱。本文首次提出了通过旋转相量对PV曲线进行理论研究，以解决不同光伏逆变器中的谐波发射难题，并为光伏逆变器在不同负载条件下实现多功能能力提供基础。另一方面，提出了一种具有不同运行模式的单相分时微型升压MPVI，并在不同的PV和负载条件下运行，以提高其效率和补偿能力，而不会产生不良谐波发射。给出了相应的控制策略和稳定性分析。最后，提出了一个 1.5 kW 原型，以谐波发射问题、补偿能力和效率为基准。实验结果清楚地表明，所提出的拓扑和控制方法可以以更高的效率执行有源功率注入和电能质量补偿，并动态避免谐波发射到电网中。