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交直流混合微电网分段协调控制策略
作者:
作者单位:

华北电力大学电气与电子工程学院, 北京市 102206

作者简介:

朱永强(1975—),男,博士,主要研究方向:交直流混合微电网、新能源发电与并网、能源互联网。E-mail: zyq@ncepu.edu.cn

通讯作者:

张泉(1995—),男,通信作者,硕士研究生,主要研究方向:交直流混合微电网、新能源发电与并网。E-mail: zhangquan6899@163.com

基金项目:

国家重点研发计划资助项目(2018YFB0904701)。


Segmented Coordination Control Strategy for Hybrid AC/DC Microgrid
Author:
Affiliation:

School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904701).

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    摘要:

    为解决交直流混合微电网因微源出力变化、负荷变化和储能装置因荷电状态导致充放电功率发生变化等引起的功率波动问题,提出一种混合微电网分段协调控制策略。针对孤岛状态下的混合微电网,分析了混合微电网的典型拓扑和各运行模式下的功率关系。采用标幺化的方法得到了可表征混合微电网整体运行状态的特征量,根据该特征量的变化量对控制策略进行分段,对各段控制的工作原理进行了详细的分析,具体研究了在不同控制段中各变流器的相互协调;针对可能出现的网间交换功率振荡以及互联变流器(ILC)运行模式频繁切换的问题,对动作判据进行了补偿。最后,在PSCAD/EMTDC中建立了仿真模型,仿真结果表明,在不同工况下各变流器均可迅速做出响应,保证系统的稳定运行。

    Abstract:

    In order to solve the power fluctuation caused by the change of micro-source output, loads and charging and discharging power of energy storage devices because of state of charge in hybrid AC/DC microgrid, a segmented coordination control strategy for hybrid microgrid is proposed. Aiming at the hybrid microgrid in the islanded state, the typical topology of the hybrid microgrid and the power relations in different operation modes are analyzed. The characteristic quantity which can represent the whole operation state of hybrid microgrid is obtained by the standardization method. According to the variation of the characteristic quantity, the control strategy is divided into segments. Then the working principle of each section control is analyzed in detail and the coordinated control of the converters in different control segments is studied. Aiming at the possible power oscillation in microgrid and frequent switching of operation modes for interlinking converter (ILC), the action criterion is compensated. Finally, a simulation model is established in PSCAD/EMTDC. The simulation results show that all converters can respond quickly in different operation conditions to ensure the stable operation of the system.

    图1 运行模式分段Fig.1 Segmentation of operation mode
    图2 ILC控制策略图Fig.2 Control strategy diagram of ILC
    图3 模式1、模式2切换过程中ILC的功率变化曲线Fig.3 Power change curve of ILC during switching of mode 1 and mode 2
    图4 仿真2中ILC的功率变化曲线Fig.4 Power change curve of ILC in case 2
    图5 仿真3中ILC的功率变化曲线Fig.5 Power change curve of ILC in case 3
    图 交直流混合微电网典型拓扑Fig. Typical topology of hybrid AC/DC microgrid
    图 ILC控制原理图Fig. Diagram of ILC control strategy
    图 MPPT向CU切换原理图Fig. Diagram of principle from MPPT switching to CU
    图 混合微电网能量管理流程图Fig. Flow chart of energy management in hybrid microgrid
    图 仿真2中直流侧储能荷电状态Fig. SOC of DS in DC microgrid in case2
    图 仿真3中交流侧储能荷电状态Fig. SOC of DS in AC microgrid of simulation 3
    图 功率盈余仿真对比图Fig. Comparison in simulation of power surplus
    图 功率匮乏仿真对比图Fig. Comparison in simulation of power insufficient
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引用本文

朱永强,张泉,刘康,等.交直流混合微电网分段协调控制策略[J].电力系统自动化,2020,44(6):52-58. DOI:10.7500/AEPS20190227008.
ZHU Yongqiang,ZHANG Quan,LIU Kang,et al.Segmented Coordination Control Strategy for Hybrid AC/DC Microgrid[J].Automation of Electric Power Systems,2020,44(6):52-58. DOI:10.7500/AEPS20190227008.

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历史
  • 收稿日期:2019-02-27
  • 最后修改日期:2019-06-10
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  • 在线发布日期: 2020-03-21
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