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基于相位补偿和虚拟阻抗优化的LCL型并网变流器改进控制
作者:
作者单位:

1.北京交通大学国家能源主动配电网技术研发中心,北京市 100044;2.北京电动车辆协同创新中心,北京市 100044;3.新能源与储能运行控制国家重点实验室(中国电力科学研究院有限公司),北京市 100192

作者简介:

高英瀚(1996—),男,硕士研究生,主要研究方向:新能源发电技术。E-mail:17121431@bjtu.edu.cn
唐芬(1984—),女,通信作者,博士,讲师,主要研究方向:电力电子与电力传动、新能源发电、微电网系统控制等。E-mail:fent@bjtu.edu.cn
刘京斗(1975—),男,博士,工程师,主要研究方向:电力电子及新能源发电技术。E-mail:jdliu@bjtu.edu.cn

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0905200)。


Improved Control of Grid-connected Converter with LCL Filter Based on Phase Compensation and Virtual Impedance Optimization
Author:
Affiliation:

1.National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China;2.Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100044, China;3.State Key Laboratory of Control and Operation of Renewable Energy & Storage Systems;(China Electric Power Research Institute), Beijing 100192, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0905200).

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    摘要:

    LCL型并网变流器常采用同步旋转坐标系下基于变流器侧电感电流的并网控制,但LCL型滤波器和数字延迟的dq轴模型均存在轴间耦合,制约了并网性能,且随着开关频率降低,性能恶化更为明显。针对该问题,文中在建立LCL型并网变流器复矢量模型的基础上,对并网变流器耦合特性和传统解耦方案进行分析。针对现有方案的不足,提出了一种基于相位补偿和虚拟阻抗优化的LCL型并网变流器改进控制策略,通过零极点图详细分析了虚拟阻抗对系统耦合程度及系统阻尼特性的影响,进而给出了确定3个参数优化值的方法。最后,仿真和实验结果表明,与现有方案相比,所提策略能够实现对系统耦合程度及阻尼特性的独立控制,有效实现解耦并改善系统动态性能。

    Abstract:

    The grid-connected control based on inductor current on the side of converter in synchronous rotating coordinate system is widely applied in the grid-connected converter with LCL-filter. However, the axe-cross-coupling exist in the dq models of LCL filter and digital delay, which constrains the grid-connected performance and becomes worse as the switching frequency decreases. To address this issue, based on the complex vector modeling of grid-connected converter with LCL-filter, this paper analyzes the coupling characteristics of the grid-connected converter and the conventional decoupling scheme. Aiming at the shortcomings of the existing control strategies, this paper proposes an improved control strategy of the grid-connected converter with LCL-filter based on phase compensation and virtual impedance optimization. Then, the effect of virtual impedance on system coupling and system damping characteristics is analyzed in detail through the zero-pole plots. And the method for determining optimization values of three parameters are given. Finally, the simulation and experimental results show that the proposed strategy can achieve independent control of system coupling degree and damping characteristics, while effectively realize decoupling and improve system dynamic performance.

    表 2 Table 2
    表 3 Table 3
    图1 LCL型并网变流器拓扑Fig.1 Topology of grid-connected converter with LCL filter
    图2 同步旋转坐标系下的控制框图Fig.2 Control block diagram in synchronous rotating coordinate system
    图3 系统复矢量模型图Fig.3 Diagram of complex vector model of the system
    图4 改进并网控制Fig.4 Improved grid-connected control
    图5 R和X变化时的零极点图Fig.5 Pole-zero plot with the variation of R and X
    图6 实验波形图Fig.6 Experimental waveforms
    图 θ B+θ C 相位补偿控制框图Fig. Control diagram of phase compensation by θ B+θ C
    图 实验平台图Fig. Diagram of prototype
    图1 LCL型并网变流器拓扑Fig.1 Topology of grid-connected converter with LCL filter
    图2 同步旋转坐标系下的控制框图Fig.2 Control block diagram in synchronous rotating frame
    图3 系统复矢量模型图Fig.3 Diagram of complex vector model of the system
    图4 改进并网控制Fig.4 Improved grid-connected control
    图5 R和X变化时的零极点图Fig.5 Pole-zero plot with changed R and X
    图6 实验波形图Fig.6 Experimental waveforms
    表 1 不同情况下的系统带宽及相位裕度Table 1 System bandwidths and phase margins in different scenarios
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引用本文

高英瀚,唐芬,刘京斗,等.基于相位补偿和虚拟阻抗优化的LCL型并网变流器改进控制[J].电力系统自动化,2020,44(3):167-175. DOI:10.7500/AEPS20190330002.
GAO Yinghan,TANG Fen,LIU Jingdou,et al.Improved Control of Grid-connected Converter with LCL Filter Based on Phase Compensation and Virtual Impedance Optimization[J].Automation of Electric Power Systems,2020,44(3):167-175. DOI:10.7500/AEPS20190330002.

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  • 收稿日期:2019-03-30
  • 最后修改日期:2019-07-17
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  • 在线发布日期: 2020-02-14
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