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基于鲁棒扰动观测器的直流微电网电压动态补偿控制
作者:
作者单位:

1.北方工业大学电气与控制工程学院,北京市 100144;2.国网河北省电力有限公司电力科学研究院,河北省石家庄市 050021

作者简介:

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFC0809700);北京市高水平创新团队建设计划资助项目(IDHT20180502);北方工业大学科技创新工程计划资助项目(18XN141)。


Voltage Dynamic Compensation Control of DC Microgrid Based on Robust Disturbance Observer
Author:
Affiliation:

1.College of Electrical and Control Engineering, North China University of Technology, Beijing 100144, China;2.Electric Power Research Institute of State Grid Hebei Electric Power Corporation, Shijiazhuang 050021, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFC0809700), Beijing High Level Innovation Team Construction Plan (No. IDHT20180502), and North China University of Technology (No. 18XN141).

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    摘要:

    针对直流微电网中母线电压控制问题,设计一种基于鲁棒扰动观测器的动态补偿控制策略,完成DC-DC变换器的电压补偿。首先在直流微电网系统架构的基础上对母线电压波动进行理论分析,其次建立直流微电网系统的DC-DC变换器状态空间数学模型,得到控制系统的输入输出关系。根据鲁棒双互质分解和尤拉参数化稳定控制器理论,得到基于鲁棒扰动观测器的控制架构,应用模型匹配理论反向补偿电流扰动所产生的输出值。通过线性矩阵不等式(LMI)方法求解电压环补偿控制器,并根据DC-DC变换器的动态结构图设计电流环补偿控制器。半实物仿真结果表明,该架构能够在不改变原系统结构参数的前提下,提升DC-DC变换器的动态性能,抑制负载投切、功率波动以及交流侧负载不平衡等引起的直流母线电压波动,增强系统的鲁棒性。

    Abstract:

    Aiming at the problem of bus voltage control in DC microgrid, a dynamic compensation control strategy based on robust disturbance observer is designed to complete voltage compensation of DC-DC converter. Firstly, based on the architecture of DC microgrid system, the theoretical analysis of the bus voltage fluctuation is carried out. Secondly, the state space mathematical model of the DC-DC converter of the DC microgrid system is established, and the input and output relationship of the control system is obtained. According to the robust dual-mass decomposition and the theory of Youla's parameterized stability controller, the control architecture based on robust disturbance observer is obtained. The model matching theory is applied to compensate the output value generated by the current disturbance. The voltage loop compensation controller is solved by the linear matrix inequality (LMI) method. The current loop compensation controller is designed according to the dynamic structure diagram of the DC-DC converter. The results of semi-physical experiments show that the architecture can improve the dynamic performance of DC-DC converter without changing the structural parameters of the original system, and suppress DC bus voltage fluctuation caused by load switching, power fluctuation and AC side load imbalance, and enhances the robustness of the system.

    图1 基于鲁棒扰动观测器的控制架构Fig.1 Control architecture based on robust disturbance observer
    图2 基于DC-DC变换器的鲁棒扰动观测器控制架构Fig.2 Robust disturbance observer control architecture based on DC-DC converter
    图3 动态补偿控制策略下的暂态扰动实验Fig.3 Transient disturbance experiment with dynamic compensation control strategy
    图4 动态补偿控制策略下的稳态扰动实验Fig.4 Steady-state disturbance experiment with dynamic compensation control strategy
    图 直流微电网结构图Fig. structure diagram of DC microgrid
    图 典型DC-DC变换器Fig. Typical DC-DC converter
    图 模型匹配理论Fig. Theory of model matching
    图 电流环动态补偿原理图Fig. Schematic diagram of current loop dynamic compensation
    图 基于鲁棒扰动观测器的动态补偿控制架构Fig. Dynamic compensation control strategy based on robust disturbance observer
    图 AppSIM半实物仿真平台Fig. AppSIM semi-physical simulation platform
    图 双环控制策略在暂态扰动下的实验波形Fig. Experimental waveform of double loop control strategy with transient-state disturbance
    图 双环控制策略在稳态扰动下的实验波形Fig. Experimental waveform of double loop control strategy with steady-state disturbance
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引用本文

胡长斌,王海鹏,罗珊娜,等.基于鲁棒扰动观测器的直流微电网电压动态补偿控制[J].电力系统自动化. DOI:10.7500/AEPS20190805002.

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  • 收稿日期:2019-08-05
  • 最后修改日期:2020-01-15
  • 录用日期:2019-09-21
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