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首页> 外文期刊>International journal of electrical power and energy systems >Performance improvement strategy for photovoltaic generation through dynamic reconfiguration of cell strings
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Performance improvement strategy for photovoltaic generation through dynamic reconfiguration of cell strings

机译：通过动态重新配置细胞串的光伏发电性能改进策略

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摘要

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.
机译：本文提出了一种动态重新配置光伏（PV）串和逆变器的策略，以提高光伏系统效率，并在低辐照条件下降低光伏系统的谐波发射。在所提出的PV组控制系统中，控制并行桥接开关以形成可以与多逆变器共同运行的多功率组。组控制系统的利益和谐波电流用于定义性能指标。动态重新配置策略用于控制PV系统的连接模式以优化索引。考虑了PV串输出电源的波动，基于最小二乘回归算法预测PV功率变化范围，评估PV系统的连接模式以防止逆变器过载，并且最佳连接模式是当系统频繁地切换基于投票理论方法时决定。设计了一种包括三个PV阵列模拟器和三个逆变器的实验系统平台，并构建了若干光伏系统操作的场景，以验证所提出的策略的可行性和有效性。实验结果表明，与传统的PV操作模式相比，所提出的策略可以在低太阳照射下提高光伏发电性能。根据控制策略的益处，评估方案成本和恢复时间，投资者可以迅速恢复成本。

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