带超级电容的级联型光伏并网逆变器控制策略

熊兰; 桂园; 柳慧梅; 宫金武

引用本文:	熊兰,桂园,柳慧梅,等.带超级电容的级联型光伏并网逆变器控制策略[J].电力系统保护与控制,2019,47(2):108-114.
	XIONG Lan,GUI Yuan,LIU Huimei,et al.Control strategy of a cascaded inverter for grid-connected photovoltaic system with supercapacitor[J].Power System Protection and Control,2019,47(2):108-114

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带超级电容的级联型光伏并网逆变器控制策略
熊兰¹,桂园¹,柳慧梅¹,宫金武²
(1.湖北工业大学太阳能高效利用湖北省协同创新中心，湖北武汉 430068; 2.武汉大学电气工程学院，湖北武汉 430072)

摘要:

针对由光伏电池板参数的分散性、遮挡不均以及光照强度波动等原因造成的发电功率损失及系统不稳定等问题，提出一种带超级电容储能的混合级联型光伏逆变器。首先，分析了该逆变器利用超级电容单元补偿光伏发电功率波动的工作原理。然后，提出了一种基于PI控制和重复控制的控制策略。该控制策略引入占空比修正模块对光伏单元实施分散的MPPT控制，以提高发电效率，并对超级电容单元进行功率控制以平滑逆变器输出功率的波动。最后，通过仿真和实验验证了该逆变器及其控制策略的可行性。

关键词: 混合级联光伏发电超级电容最大功率点跟踪

DOI：10.7667/PSPC180069

分类号:

基金项目:国家自然科学基金青年基金项目资助(51507054);太阳能高效利用湖北省协同创新中心开放基金项目资助 (HBSKFMS2014035)

Control strategy of a cascaded inverter for grid-connected photovoltaic system with supercapacitor

XIONG Lan¹,GUI Yuan¹,LIU Huimei¹,GONG Jinwu²

(1. Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy, Hubei University of Technology, Wuhan 430068, China;2. School of Electrical Engineering, Wuhan University, Wuhan 430072, China)

Abstract:

A hybrid cascaded PV inverter with supercapacitor energy storage is proposed to overcome the problems of power generation loss and instability of the PV system caused by dispersion of PV panel parameters, unequal sheltering and irradiation fluctuations. First, the operation principle of the inverter to compensate the PV power fluctuation with a supercapacitor cell is analyzed. Then, a control strategy based on PI control and repetitive control is proposed. It implements distributed MPPT for all PV cells with a duty modifying module to improve the power generation efficiency, and controls the power of the supercapacitor cell to smooth the output power fluctuations of the inverter. Finally, simulation and experimental results verify the feasibility of the proposed inverter and its control strategy. This work is supported by National Natural Science Foundation of China (No. 51507054) and Open Fund of Hubei Collaborative Innovation Center for High-Efficiency Utilization of Solar Energy (No. HBSKFMS2014035).

Key words: hybrid cascaded photovoltaic power generation supercapacitor maximum power point tracking

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