基于虚拟惯性参数可行域的直流微电网高频振荡抑制

doi:10.11930/j.issn.1004-9649.202402023

摘要/Abstract

摘要：

针对不合理虚拟惯性控制参数引发的直流微电网高频振荡失稳问题，提出了低通滤波器等效建模方法，建立了直流微电网的降阶模型及其电压闭环传递函数。从保证直流微电网小扰动稳定性角度出发，定义了以下垂系数和低通滤波控制带宽为参数空间的虚拟惯性参数可行域概念。基于电压闭环传递函数得到的零极点，提出了虚拟惯性参数可行域求解方法，该可行域为直流微电网的虚拟惯性控制参数设计提供了切实可行的指导依据。最后，利用PLECS软件搭建了基于开关模型的直流微电网仿真算例，多组仿真结果均验证了降阶模型和虚拟惯性控制参数可行域的有效性。

关键词: 直流微电网, 降阶模型, 高频振荡, 虚拟惯性参数, 可行域

Abstract:

Addressing the issue of high-frequency oscillation instability in DC microgrids caused by unreasonable virtual inertia control parameters, a low-pass filter equivalent modeling approach is proposed. This approach establishes a reduced-order model of the DC microgrid and its voltage closed-loop transfer function. From the perspective of ensuring the small-signal stability of the DC microgrid, the concept of a feasible region for virtual inertia parameters is defined in the parameter space, with droop coefficients and low-pass filter control bandwidth as the primary parameters. Based on the zeros and poles obtained from the voltage closed-loop transfer function, a method for solving the feasible region of virtual inertia parameters is proposed. This feasible region provides practical guidance for the design of virtual inertia control parameters in DC microgrids. Finally, a simulation case of a DC microgrid based on a switching model is built using PLECS software. Multiple simulation results have verified the effectiveness of the reduced-order model and the feasible region of virtual inertia control parameters.

Key words: direct current microgrid, reduced order model, high frequency oscillation, virtual inertia parameters, feasible region

王锐, 赵学深, 张新慧, 彭克, 许洪璐, 孙浩玥. 基于虚拟惯性参数可行域的直流微电网高频振荡抑制[J]. 中国电力, 2024, 57(10): 123-132.

Rui WANG, Xueshen ZHAO, Xinhui ZHANG, Ke PENG, Honglu XU, Haoyue SUN. Virtual Inertia Parameter Feasible Region Based High-frequency Oscillation Suppression of DC Microgrid[J]. Electric Power, 2024, 57(10): 123-132.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202402023

https://www.electricpower.com.cn/CN/Y2024/V57/I10/123

图/表 20

图 1 直流微电网拓扑

Fig.1 Topology of the DC microgrid

图 2 2种典型虚拟惯性控制策略

Fig.2 Two typical virtual inertia control strategies

图 3 直流微电网的高频振荡仿真结果

Fig.3 Simulation results of high-frequency oscillations in DC microgrid

图 4 降阶模型拓扑

Fig.4 Topology of the reduced-order model

图 5 降阶模型的高频振荡仿真结果

Fig.5 Simulation results of high-frequency oscillations in the reduced-order model

图 6 传递函数Gud(s)和Guiu(s)的频域响应曲线（第1组参数）

Fig.6 Frequency domain response curve of transfer functions Gud(s) and Guiu(s) (group 1 parameters)

图 7 传递函数Guiu(s)的零极点分布（第1组参数）

Fig.7 Zero pole distribution of transfer function Guiu(s) (first set of parameters)

图 8 虚拟惯性参数可行域刻画流程

Fig.8 Flow for characterizing the feasible region of virtual inertia parameters

图 9 虚拟惯性参数可行域

Fig.9 The feasible region of virtual inertia parameters

表 1 4组虚拟惯性参数

Table 1 Four sets of virtual inertia parameters

下垂系数	第1组	第2组	第3组	第4组
K_d	0.52	0.25	0.52	0.63
ω_f	7000	7000	1000	7000

图 10 第2组参数的频域响应曲线

Fig.10 Frequency domain response curve of the second set of parameters

图 11 传递函数Guiu(s)的扫频原理

Fig.11 The swept principle of the transfer function Guiu(s)

图 12 第2组参数的零极点分布

Fig.12 Zero pole distribution of the second set of parameters

图 13 第3组参数的频域响应曲线

Fig.13 Frequency domain response curve of the third set of parameters

图 14 第3组参数的零极点分布

Fig.14 Zero pole distribution of the third set of parameters

图 15 第4组参数的频域响应曲线

Fig.15 Frequency domain response curve of the fourth set of parameters

图 16 第4组参数的零极点分布

Fig.16 Zero pole distribution of the fourth set of parameters

图 17 第2组参数的时域仿真结果

Fig.17 Simulation results for the second set of parameters

图 18 第3组参数的时域仿真结果

Fig.18 Simulation results for the third set of parameters

图 19 不同长度直流线路的仿真结果

Fig.19 Simulation results for different lengths of DC lines

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