• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2022, Vol. 43 ›› Issue (7): 87-95.doi: 10.12204/j.issn.1000-7229.2022.07.010

• 智能电网 • 上一篇    下一篇

直流微电网不同荷电状态多储能系统分布式控制

马海宁1(), 王鲁杨1, 仇成2, 乔露1, 吉铭成1   

  1. 1.上海电力大学电气工程学院,上海市 200090
    2.国网上海市电力公司经济技术研究院, 上海市 200233
  • 收稿日期:2021-12-15 出版日期:2022-07-01 发布日期:2022-06-30
  • 通讯作者: 马海宁 E-mail:1131617582@qq.com
  • 作者简介:王鲁杨(1963),女,硕士,副教授,主要研究方向为电力电子技术在电力系统中的应用;
    仇成(1985),男,硕士,高级工程师,主要研究方向为配网规划;
    乔露(199),女,硕士研究生,主要研究方向为直流微电网储能系统运行控制;
    吉铭成(1995),男,硕士研究生,主要研究方向为分布式并网系统孤岛检测技术。
  • 基金资助:
    上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)

Research on Distributed Control of Multiple Energy Storage Systems with Different SOC in DC Microgrid

MA Haining1(), WANG Luyang1, QIU Cheng2, QIAO Lu1, JI Mingcheng1   

  1. 1. School of Electrical Engineering, Shanghai Electric Power University, Shanghai 200090, China
    2. State Grid Shanghai Economic Research Institute, Shanghai 200233, China
  • Received:2021-12-15 Online:2022-07-01 Published:2022-06-30
  • Contact: MA Haining E-mail:1131617582@qq.com
  • Supported by:
    project from Shanghai Green Energy Grid Connection Engineering Technology Research Center(13DZ2251900)

摘要:

直流微电网在离网状态下需要储能系统维持其稳定运行,而在多储能变换器并联的情况下,线路阻抗不匹配会导致各储能单元荷电状态(state of charge, SOC)无法均衡以及变换器输出电流无法精确分配,同时由“虚拟阻抗”造成的母线电压偏差也需要得到补偿。针对一系列问题,提出改进的SOC均衡控制策略,自适应调整“虚拟阻抗”实现SOC均衡,并提出一种分布式二次控制策略,构造包含多个信息的转移因子,生成唯一的且能同时实现消除线路阻抗影响及恢复母线电压两个目标的电压补偿项,以减轻系统通信压力。其中为获得全局所需平均值信息,基于一致性算法,利用低带宽通信在相邻变换器间进行信息交换,并设计了分布式动态平均值算法控制器。最后搭建光伏多储能系统模型,仿真与实验验证了该控制策略的有效性和准确性。

关键词: 直流微电网, 荷电状态(SOC), 母线电压恢复, 动态平均值算法

Abstract:

A DC microgrid needs the energy storage system to maintain its stable operation when it is off-grid. In the case of multiple energy-storage converters in parallel, the line impedance mismatch will lead to the SOC of each energy-storage unit cannot be balanced and the output current of the converter cannot be accurately distributed. At the same time, the bus voltage deviation caused by the “virtual impedance” also needs to be compensated. Aiming at a series of problems, an improved SOC equalization control strategy is proposed to adaptively adjust the “virtual impedance” to realize SOC equalization, and a distributed secondary control strategy is proposed to construct a transfer factor containing multiple information λ, thus generating a unique voltage compensation term that can both eliminate the influence of line impedance and restore bus voltage at the same time, so that the communication pressure of the system can be alleviated. In order to obtain the global average information, a distributed dynamic average algorithm controller is designed by using low bandwidth communication to exchange information between adjacent converters according to consistency algorithm. A photovoltaic multi-energy storage system model is built. Simulation and experiments verify the effectiveness and accuracy of the control strategy.

Key words: DC microgrid, state of charge (SOC), bus voltage recovery, dynamic average algorithm

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