电工技术学报  2016, Vol. 31 Issue (7): 107-117    DOI:
电力系统及其自动化 |
基于分层控制策略的光伏-蓄电池系统动态提高并网点功率因数
肖朝霞, 樊世军, 杨庆新
天津工业大学电工电能新技术天津市重点实验室 天津 300387
Dynamically Improving the Power Factor of PCC Using Photovoltaic-Battery Generation System Based on Hierarchical Control Strategy
Xiao Zhaoxia, Fan Shijun, Yang Qingxin
Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China
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摘要 提出了一种利用多功能光伏-蓄电池组合发电系统提高并网点功率因数的新方案,可降低光伏发电的成本、减少无功补偿设备的投资、增加用户经济效益以及提高电网供电能力。在综合考虑并网逆变器的额定容量、光照条件及负荷功率瞬时变化等实际情况下,分析系统多种运行模式,提出一种分层控制策略,实现了运行状态的无缝转换,保证在逆变器额定容量下输出有功的同时提供无功补偿以动态提高并网点功率因数。当电网需求逆变器输出无功较多导致有功输出受限而光伏仍有更多有功输出时,将光伏剩余出力储存至蓄电池以尽可能减少弃光,提高光伏利用率。在低光照或夜间时,蓄电池放电维持直流母线电压,使逆变器可继续发出无功功率,同时实现光伏软关闭。建立了多功能光伏-蓄电池发电仿真系统,仿真结果验证了所提方案的可靠性。
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肖朝霞
樊世军
杨庆新
关键词 多功能光伏-蓄电池 功率因数 无功补偿 分层控制 模式切换    
Abstract:A novel control strategy is proposed to improve the power factor at the point of common coupling (PCC) using the multi-functional photovoltaic (PV)-battery generation system, which can decrease the cost of PV generation, save the investment of excess equipment, and improve the economic efficiency of users and the power supply capacity of the main grid. By considering the rated capacity of the inverter, solar radiation intensity, and simultaneous fluctuations of load power, different operation modes of the PV-battery generation system are analyzed and a hierarchical control strategy is employed. The presented control strategy can achieve the seamless switch from one operation mode to another and guarantee that the PV-inverter can feed active power to the public grid meanwhile provide the reactive power compensation to dynamically improve the power factor of the PCC. A method that makes the remaining PV power save to the battery as much as possible is proposed to improve the utilization of PV and reduce the disposable light,when the grid needs the inverter to output more reactive power not active power but PV can output much aitive power. In low-light condition or at night, the battery discharges to maintain the DC bus voltage, ensuring that the inverter can continue to provide reactive power for the main grid, and the PV is closed automatically without any hardware breaker. A simulation model of the multi-functional PV-battery generation system is built and the results verify the correctness and effectiveness of the proposed control strategy.
Key wordsMulti-functional photovoltaic-battery    power factor    reactive power compensation    hierarchical control strategy    operation modes switch   
收稿日期: 2015-03-19      出版日期: 2016-04-20
PACS: TM615  
基金资助:国家自然科学基金(51107088)、天津市科技支撑计划项目(15ZCZDGX00980)和天津市应用基础与前沿技术研究计划重点项目(15JCZDJC32100)资助。
作者简介: 肖朝霞 女,1981年生,博士,副教授,研究方向分布式发电系统及其控制。E-mail:xiaozhaoxia@tjpu.edu.cn(通信作者);樊世军 男,1988年生,硕士研究生,研究方向为分布式发电控制。E-mail:fanshijun126@126.com
引用本文:   
肖朝霞, 樊世军, 杨庆新. 基于分层控制策略的光伏-蓄电池系统动态提高并网点功率因数[J]. 电工技术学报, 2016, 31(7): 107-117. Xiao Zhaoxia, Fan Shijun, Yang Qingxin. Dynamically Improving the Power Factor of PCC Using Photovoltaic-Battery Generation System Based on Hierarchical Control Strategy. Transactions of China Electrotechnical Society, 2016, 31(7): 107-117.
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https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I7/107