提高组串光伏发电效率的直流动态重构控制策略

doi:10.19595/j.cnki.1000-6753.tces.L90302

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Abstract In order to solve the problem of low efficiency of string inverter during uniform and low irradiance conditions, a DC side switch reconfiguration strategy is proposed to improve the parallel efficiency of the string inverter. Based on a photovoltaic(PV) DC switch topology, switches are controlled to form multi-PV groups that can run jointly with multi-inverters. The efficiency of PV system and the electrical life of switches are considered. The number of inverters is controlled to optimize the benefit index function of the PV system. Based on the least-squares regression algorithm, short time range of weather is predicted. The connection methods of the PV system structure are analyzed to prevent power violation of inverters. The best switch connection at different times is compared to determine the best connection scheme. The times of switching is minimized by the scheme. Finally, the final scheme of DC switch reconfiguration is decided by control decision. The proposed strategy is compared with PV generation strategies of consider only objective function and conventional to verify the effectiveness and feasibility of this strategy.

Key words： Photovoltaic system group control system paralleled multi-inverters dynamic reconfiguration frequent switching

Received: 09 July 2020

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TM76

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	Xue Shiwei
	Jia Qingquan
	Li Pan
	Liang Jifeng
	Geng Liang

Cite this article:

Xue Shiwei,Jia Qingquan,Li Pan等. Efficiency Improvement Control Strategy for Photovoltaic Generation Through DC Dynamic Reconfiguration[J]. Transactions of China Electrotechnical Society, 2021, 36(9): 1761-1770.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90302 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I9/1761

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