SHENG Wanxing1, LAN Zheng2, DUAN Qing1, LI Yuling1, MA Chunyan1, LÜ Zhipeng1
1. Key Laboratory of Distribution Transformer Energy-Saving Technology (China Electric Power Research Institute),Haidian District, Beijing 100192, China
2. National Electric Power Conversion and Control Engineering Technology Research Center (Hunan University), Changsha 410082, Hunan Province, China
For energy storage requirements of energy router, a new approach with one of its bridge arms served as interface to connect energy storage system is proposed, eliminating additional power conversion circuit. Control strategy is designed and system performance is analyzed. Self energy storage based energy router (SESER) has ability of voltage stability in power vacancy and short time energy supply in time of energy subnet switched to off-grid mode. Neutral current control is not affected in charging and discharging processes. Simulation for voltage deep droop of input port and power fluctuation of distributed generation are carried out. Results verify validity and effectiveness of the proposed topology and its control strategy.
KEY WORDS :energy router;self-energy storage;power fluctuation;voltage sag;
0 引言
以光伏、风机和储能为代表的分布式电源(distribution energy resource,DER)大量接入配电网势不可挡,配电网面临的接入压力越来越大,围绕如何提高分布式电源接入水平,微电网、主动配电网、智能电网、自主配电网等新兴技术框架发展迅速[1-3]。其中,以能量路由器(energy router,ER)为核心接口,以能源子网的形式组网是可行方案之一[4],逐步得到了国内外学者的关注[5-6]。ER的突出特点在于其固态模块可对输入输出两侧的电压幅值和相位实时控制[7],可实现电压、电流和功率的灵活调节,是能源子网与配电网之间理想的接口装置[8]。
本文提出利用能量路由器自身拓扑中连接中线电流的桥臂电路充当储能系统的充放电接口,无缝连接超级电容,无需额外增加功率变换电路,灵活实现自储能。提出的自储能型能量路由器(self-energy storage based energy router,SESER)在输入端电压深度跌落和能源子网分布式能源功率波动引起功率缺额时,保持能源子网电压稳定,并在能源子网离网切换时提供短时的能量供应,而且控制储能系统充放电的同时不影响桥臂电路对中线电流的控制,从而不影响能量路由器供电质量。
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