直流微网中混合储能系统的无互联通信网络功率分配策略

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摘要直流微网中通常采用混合储能系统作为缓冲环节,对分布式能源和负载引起的不同时间尺度功率波动进行补偿。为实现功率在能量密度型储能元件和功率密度型储能元件之间合理分配,提出无互联通信网络的分层控制策略。其中,底层控制以电压变化率作为虚构的信息载体,通过设置不同储能接口变换器输出电压关于功率的“灵敏度”,确保超级电容在负载突变瞬间能够提供大部分功率;二次控制对底层控制产生的稳态误差进行补偿,以实现输出电压稳定,并保证超级电容稳态电流为零。在此控制框架下,各储能单元仅需本地信号即可实现自主协调运行,避免了互联通信网络所带来的经济性和可靠性问题。最后,实验结果验证所提方法的可行性和有效性。

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关键词 ：混合储能系统, 直流微网, 功率分配, 分层控制

Abstract：In order to compensate multiple time scales power fluctuation resulted from distributed energy resources and loads, hybrid energy storage systems are employed as the buffer unit in DC microgrid. In this paper, a wireless hierarchical control strategy is proposed to realize power sharing between energy density storage unit and power density storage unit in reasonable fashion. Primary control introduces change rate of voltage as virtual information carrier, and urges supercapacitor unit to pick up major dynamic power immediately in the load switching moment, by setting sensitivity of different storage interface converters. The steady state error produced in primary control is eliminated by secondary control, in which voltage magnitude is maintained and zero steady state current in supercapacitor is guaranteed. In this framework, autonomous and coordinated control is achieved using only local information of each unit, therefore economic and reliability issues born along communication network can be avoided. The feasibility and effectiveness of the proposed control strategy are validated by experimental results.

Key words： Hybrid energy storage systems (HESS) DC microgrid power sharing hierarchical control

收稿日期: 2016-12-20 出版日期: 2017-05-26

PACS:

TM46

基金资助:国家电网公司科技项目资助（DG71-16-008）

通讯作者: 杨捷男,1988年生,博士研究生,研究方向为电力电子及其传动,直流微网及交直流混合微网。E-mail: jieyang@bjtu.edu.cn

作者简介: 金新民男,1950年生,教授,博士生导师,从事交流传动、新能源发电等方面研究。E-mail: jinxm@bjtu.edu.cn

引用本文:

杨捷, 金新民, 吴学智, 陈美福. 直流微网中混合储能系统的无互联通信网络功率分配策略[J]. 电工技术学报, 2017, 32(10): 135-144. Yang Jie, Jin Xinmin, Wu Xuezhi, Chen Meifu, V G Agelidis. A Wireless Power Sharing Control Strategy for Hybrid Energy Storage Systems in DC Microgrids. Transactions of China Electrotechnical Society, 2017, 32(10): 135-144.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I10/135

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