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一种基于离散时间交互的改进直流微电网控制策略
作者:
作者单位:

1.浙江工业大学信息工程学院,浙江省 杭州市 310023;2.嘉兴市恒创电力设备有限公司,浙江省 嘉兴市 314033

作者简介:

魏春(1983—),男,工程师,主要研究方向:电力电子技术,电动汽车充电和新能源技术研究与开发。E-mail:chunwei18@zjut.edu.edu
徐鉴其(1995—),男,硕士研究生,主要研究方向:直流微电网运行与控制。E-mail:13456741248@163.com
张有兵(1971—),男,通信作者,博士,教授,博士生导师,主要研究方向:智能电网、分布式发电及新能源优化控制、电动汽车入网。E-mail:youbingzhang@zjut.edu.cn
陆海强(1987—),男,博士,副教授,主要研究方向:分布式发电及新能源优化控制、微电网、智能电网。

通讯作者:

基金项目:

国家自然科学基金资助项目(51777193)。


An Improved Control Strategy for DC Microgrid Based on Discrete Time Interaction
Author:
Affiliation:

1.College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China;2.Technology Research Center, Jiaxing Hengchuang Electric Equipment Co., Ltd., Jiaxing 314033, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51777193).

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    摘要:

    直流微电网的控制目标是保证直流微电网的电流分配精度和减小直流母线电压偏差,以维持系统的功率平衡。传统的下垂控制不能同时满足这2个控制目标。利用分布式二次控制框架,文中提出了一种改进的基于离散时间交互的直流微电网控制策略,包括了连续电压控制和离散电流控制,在保证电流分配精度的同时减小了直流母线电压偏差。不同于其他已提出的控制方法,文中所提方法只需要在离散时刻采样电流平均值信息,降低了通信负担。在MATLAB/Simulink软件上搭建了系统仿真模型,仿真验证了所提策略的有效性。

    Abstract:

    The control objective of DC microgrid is to ensure the accuracy of current distribution and reduce the deviation of DC bus voltage, so as to maintain the power balance of the system. These two control objectives cannot be achieved simultaneously by the traditional droop control. By using the distributed secondary control framework, this paper proposes an improved control strategy for DC microgrid based on discrete time interaction, including continuous-voltage control and discrete-current control, which can ensure the accuracy of current distribution and reduce the voltage deviation of DC bus simultaneously. Different from other proposed control methods, the proposed method in this paper only needs to sample the average current information at discrete times, which reduces the communication burden. The system model is built in MATLAB/Simulink to verify the effectiveness of the proposed control strategy.

    图1 分布式二次控制器原理图Fig.1 Principle diagram of distributed secondary controller
    图2 接入二次控制后电压、电流曲线Fig.2 Voltage and current curves after connecting secondary control
    图3 负载扰动时DG输出电流Fig.3 Output current of DG with load disturbance
    图4 2个DG接收电压信息时电压、电流曲线Fig.4 Voltage and current curves when two DGs receive voltage information
    图5 1个DG接收电压信息时电压、电流曲线Fig.5 Voltage and current curves when one DG receives voltage information
    图 传统直流微电网结构Fig. Traditional DC microgrid structure
    图 简化直流微电网等效电路Fig. Simplified DC microgrid equivalent circuit
    图 传统下垂控制的局限性Fig. Limitations of traditional droop control
    图 孤岛直流微电网分布式二次控制框架Fig. Distributed secondary control framework of island DC microgrid
    图1 分布式二次控制器原理图Fig.1 Principle diagram of distributed secondary controller
    图2 接入二次控制后电压、电流曲线Fig.2 Voltage and current curves after connecting secondary control
    图3 负载扰动时DG输出电流Fig.3 Output current of DG with load disturbance
    图4 2个DG接收电压信息时电压、电流曲线Fig.4 Voltage and current curves when two DGs receive voltage information
    图5 1个DG接收电压信息时电压、电流曲线Fig.5 Voltage and current curves when one DG receives voltage information
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引用本文

魏春,徐鉴其,陆海强,等.一种基于离散时间交互的改进直流微电网控制策略[J].电力系统自动化,2020,44(3):49-55. DOI:10.7500/AEPS20190120006.
WEI Chun,XU Jianqi,LU Haiqiang,et al.An Improved Control Strategy for DC Microgrid Based on Discrete Time Interaction[J].Automation of Electric Power Systems,2020,44(3):49-55. DOI:10.7500/AEPS20190120006.

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历史
  • 收稿日期:2019-01-20
  • 最后修改日期:2019-03-31
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  • 在线发布日期: 2020-02-14
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