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基于改进频率微分运算的虚拟惯量控制策略
作者:
作者单位:

1.桂林理工大学机械与控制工程学院,广西省桂林市 541004;2.合肥工业大学电气与自动化工程学院,安徽省合肥市 230009

作者简介:

通讯作者:

基金项目:

桂林理工大学科研启动基金资助项目(GUTQDJJ2019167)。


Virtual Inertia Control Strategy Based on Improved Frequency Differential Operation
Author:
Affiliation:

1.College of Mechanical and Control Engineering, Guilin University of Technology, Guilin 541004, China;2.School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China

Fund Project:

This work is supported by Research Startup Fund of Guilin University of Technology (No. GUTQDJJ2019167).

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    摘要:

    可再生能源通过快速功率变换器接口接入电网受到广泛关注,但往往会引起电网等效惯量减小的频率稳定性问题。文中分析了2种现有解决方案:利用锁相环(PLL)频率直接进行微分运算的方法,其动态响应速度慢,易引起谐波放大的问题;利用二阶广义积分器-锁频环(SOGI-FLL)评估频率微分信号的方法避免了频率微分运算,但在抑制电网电压扰动方面的能力有限。为此,提出一种基于级联二阶广义积分器-锁频环(CSOGI-FLL)准确评估频率信号的虚拟惯量控制策略,即将基于二阶广义积分器原理的频率自适应滤波器加入SOGI-FLL的控制回路中,增强SOGI-FLL的扰动抑制能力。最后,建立柴储微网系统的仿真模型和实验平台,仿真和实验结果共同验证了所提控制策略的有效性。

    Abstract:

    The renewable energy sources accessed to the power grid by fast-response power converters has received widespread attention, but they often cause frequency stability problems due to the reduction of power system equivalent inertia. This paper analyzes the effectiveness of two existing solutions: the direct differential operation method using phase-locked loop (PLL) frequency has a slow dynamic response and cause noise amplifications; the frequency differential control method using the second-order generalized integrator based frequency-locked loop (SOGI-FLL) can avoid the frequency differential operation. Nevertheless, the SOGI-FLL has a limited ability in rejecting the grid voltage disturbances. To deal with this problem, this paper proposes a virtual inertia control strategy with the cascaded SOGI-FLL to accurately evaluate the frequency signal. The frequency self-adaptive filter based on SOGI is added to the SOGI-FLL control loop, to enhance the disturbance suppression capabilities. Finally, both simulation and experimental platforms of the microgrid with diesel and energy storage system are established, and the simulation and experimental results verify the effectiveness of the proposed strategy.

    表 1 Table 1
    图1 柴储系统频率协调控制框图Fig.1 Block diagram of frequency regulation control for diesel and energy storage system
    图2 单相PLL的控制框图Fig.2 Block diagram of control for a single-phase PLL
    图3 SOGI-FLL的控制框图Fig.3 Block diagram of control for SOGI-FLL
    图4 CSOGI-FLL的控制模型Fig.4 Control model of CSOGI-FLL
    图5 仿真结果Fig.5 Simulation results for tests 1 to 4
    图 柴储系统结构图Fig. Structure of the battery-diesel microgrid system
    图 功率阶跃响应的实验结果Fig. Experimental results for power step response
    图 基于虚拟惯量控制的频率稳定性实验Fig. Frequency stability experiment based on virtual inertia control
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引用本文

石荣亮,张烈平,王文成,等.基于改进频率微分运算的虚拟惯量控制策略[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191130001.
SHI Rongliang,ZHANG Lieping,WANG Wencheng,et al.Virtual Inertia Control Strategy Based on Improved Frequency Differential Operation[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191130001.

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  • 收稿日期:2019-11-30
  • 最后修改日期:2020-05-08
  • 录用日期:2020-02-16
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