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强益光伏系统用蓄电池充放电策略韵设计
桑梅",李黎明12,孙尧",封烨文",饶程2
(1.中南大学信息科学与工程学院,湖南长沙410083;2.新余高新技术产业园区新能
源发展研究院,江西新余338004)
摘要:在独立光伏系统中,蓄电池充/放电控制效果的好坏在很大程度上会影响光伏产业的发展。本文以目前独立光伏系统主流使用的阀控铅酸蓄电池(VRLA)为研究对象,在考虑系统的性能和成本的基础上,对蓄电池的充/放电和维护等进行了研究。在充电阶段,采用分段设定参考电压的方式实现对电池状态的判断,共分了6个阶段,存在着最大功率点跟踪(MPPT)、恒流充电、恒压充电、浮充和停止充电等5种状态。实验表明该充电策略能在充分利用太阳能的同时提高蓄电池的荷电状态。
关键词:独立光伏系统;阀控式铅酸蓄电池;最大功率点跟踪
中图分类号:TM912
文献标识码:B文章编号:1006—0847(2010)03-127-05
The design of battery charge/discharge control strategyinstand-alonephotovoltaicsystems
SUMei',LI Liming"2,SUN Yao',FENG Zhuowen', RAO Cheng
(l. School of Information Science and Engineering, Central South University
Changsha Hunan 410083; 2. New Energy Development Academe of Xinyu HiTech
Industrial Park, Xinyu Jiangxi 338004,China)
Abstract: In the standalone photovoltaic systems, the effects of battery charge/discharge control systems in standalone photovoltaic systems remarkably influence the development of photovoltaic industry. Consider-ing performance and costs of small standalone photovoltaic systems, this paper studies the control strate gies of charging and discharging and the maintenance of VRLA batteries. In the charging process, this sys tem divides the whole charging process into six phases based on the charging voltage of VRLA batteries and determines the battery status. Experiments verify that this strategy can make full use of the solar energy and
improve the state of charge of the batteries, thereby extend the standby time of the system Key Words: standalone photovoltaic system; VRLA battery; MPPT
1引言
蓄电池作为独立光伏系统中一个重要的组成部
收稿日期:2010-11-19 万方数据
分,起着至关重要的作用:在光照情况下它既能补充太阳能供应的不足,又能储存多余的太阳能;在无光照的情况下它是负载的唯一能源。由于外界环境和条件要求的不同,如光照强度与时间、环境温度、负载、系统的可靠性等,独立光伏系统中可能会使用到各种型号的蓄电池。
而VRLA蓄电池在独立光伏系统的投资成本
2011No.3Vol.4827