考虑分布式储能参与的直流配电网电压柔性控制策略

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摘要针对多节点直流配电网电压稳定性差且控制困难的问题,提出一种考虑分布式储能参与的直流配电网电压柔性控制策略。首先,分析直流配电网的拓扑结构,指出了现有控制策略在多节点电压调节方面的不足以及分布式储能参与调压的可行性。其次,推导配电网中交直流接口的电压-频率耦合关系以及双向直流接口的级联下垂特性。针对配电网端口交直流断面,将交流电网的频率波动经虚拟惯性作用与直流电压波动建立联系,生成虚拟电压差以控制储能响应频率波动,减小直流配电网的接入对交流电网的影响。针对配电网-微网变流器断面,依据接口类型的不同设计分布式储能单元的控制策略,使其响应配电网节点电压的变化,增强功率波动时直流电压动态稳定性,减小配电网运行模式切换的可能性。该策略仅需本地节点信息,无需通信,可扩展性好。最后,建立典型的两端直流配电网的仿真模型,通过系统仿真证明了所提柔性电压控制策略的有效性。

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关键词 ：直流配电网, 电压控制, 分布式储能, 下垂特性, 交直流耦合

Abstract：Aiming at the difficulty of voltage control and poor stability for DC distribution network with multiple nodes, a novel flexible voltage control strategy considering distributed energy storage (DES) is proposed in this paper. Firstly, the topology structure is analyzed. The disadvantages of existing voltage control method and feasibility of voltage regulation with DES are analyzed. Secondly, the voltage-frequency relationship of AC-DC interface and cascading droop characteristic of bidirectional DC-DC interface are deduced. For terminal AC-DC interface, based on the relationship between virtual inertia and the DC voltage fluctuations, the virtual voltage variation is utilized to control energy storage to compensate frequency drop, hence the impacts on grid can be reduced. For interfaces between distribution network and microgrids, the control strategies of DES are designed in accordance with the type of interface. As a result, the DES can respond to voltage change, enforce the dynamic stability of network voltage, and reduce the possibility of DC network operation mode change. The strategy is independent of communication with scalability. Finally, a dual-terminal DC distribution network model is established. The simulation results validate feasibility and effectiveness of the proposed voltage control strategy.

Key words： DC distribution network voltage control distributed energy storage (DES) droop characteristics AC-DC coupling

收稿日期: 2016-10-21 出版日期: 2017-05-26

PACS:

TM72

基金资助:国家重点基础研发计划项目（2016YF0900103）、国家自然科学基金项目（51520105011）、湖南省科技重大专项（2015GK1002）和湖湘青年英才项目（2015RS4022）资助

通讯作者: 李勇男,1982年生,教授,博士生导师,主要研究方向为电力系统运行与控制、电力电子系统与控制。E-mail: yongli@hnu.edu.cn

作者简介: 贺悝男,1991年生,博士研究生,研究方向为中压直流系统的建模及其控制。E-mail: helifamily@hnu.edu.cn

引用本文:

贺悝, 李勇, 曹一家, 王炜宇. 考虑分布式储能参与的直流配电网电压柔性控制策略[J]. 电工技术学报, 2017, 32(10): 101-110. He Li, Li Yong, Cao Yijia, Wang Weiyu. Flexible Voltage Control Strategy of DC Distribution Network Considering Distributed Energy Storage. Transactions of China Electrotechnical Society, 2017, 32(10): 101-110.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I10/101

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