Abstract In this paper, a strategy for the dynamic reconfiguration of photovoltaic (PV) strings and inverters is proposed to improve the PV system efficiency and reduce the harmonic emissions of the PV system under low irradiance conditions. In the proposed PV group control system, parallel-bridge switches are controlled to form multi-PV groups that can run jointly with multi-inverters. The benefit and harmonic current of the group control system are used to define the performance index. The dynamic reconfiguration strategy is used to control the connection mode of the PV system to optimize the index. The fluctuation of the PV string output power on the time scale is considered, the PV power variation range is predicted based on the least squares regression algorithm, the connection modes of the PV system are evaluated to prevent inverter overload, and the optimal connection mode is decided when the system frequently switches based on the voting theory method. An experimental system platform comprising three PV array simulators and three inverters is designed, and several scenarios of PV system operation are constructed to verify the feasibility and effectiveness of the proposed strategy. Experimental results show that compared with the conventional PV operation mode, the proposed strategy can improve PV generation performance under low solar irradiation. Based on the benefits of the control strategy, the scheme cost and recovery time are evaluated, and investors can quickly recover costs.

中文翻译：

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通过电池串动态重构的光伏发电性能提升策略

摘要 在本文中，提出了一种光伏（PV）串和逆变器的动态重构策略，以提高光伏系统效率并减少低辐照度条件下光伏系统的谐波排放。在提议的光伏组控制系统中，并联桥开关被控制以形成可以与多个逆变器共同运行的多光伏组。用群控系统的效益和谐波电流来定义性能指标。动态重构策略用于控制光伏系统的连接方式以优化指标。考虑光伏组串输出功率在时间尺度上的波动，基于最小二乘回归算法预测光伏功率变化范围，评估光伏系统的连接方式，防止逆变器过载，在系统频繁切换时，根据投票理论方法确定最佳连接方式。设计了由三个光伏阵列模拟器和三个逆变器组成的实验系统平台，并构建了多个光伏系统运行场景，以验证所提出策略的可行性和有效性。实验结果表明，与传统的光伏运行模式相比，所提出的策略可以提高低太阳辐照下的光伏发电性能。基于控制策略的收益，对方案成本和回收时间进行评估，投资者可以快速回收成本。设计了由三个光伏阵列模拟器和三个逆变器组成的实验系统平台，并构建了多个光伏系统运行场景，以验证所提出策略的可行性和有效性。实验结果表明，与传统的光伏运行模式相比，所提出的策略可以提高低太阳辐照下的光伏发电性能。基于控制策略的收益，对方案成本和回收时间进行评估，投资者可以快速回收成本。设计了由三个光伏阵列模拟器和三个逆变器组成的实验系统平台，并构建了多个光伏系统运行场景，以验证所提出策略的可行性和有效性。实验结果表明，与传统的光伏运行模式相比，所提出的策略可以提高低太阳辐照下的光伏发电性能。基于控制策略的收益，对方案成本和回收时间进行评估，投资者可以快速回收成本。