基于混合势函数的直流微电网群稳定性分析

doi:10.16180/j.cnki.issn1007-7820.2022.01.011

Abstract

Abstract:

The constant power load in DC microgrid group presents negative impedance characteristics, which will adversely affect the stability of DC microgrid group. Therefore, it is necessary to analyze the stability power limit of DC microgrid group. In order to solve the problem, this study uses a mixed potential function to analyze the large-signal stability of a DC microgrid group with a constant power load. According to the characteristics of the DC-DC converters connected between the sub-microgrids, the DC microgrid group is equivalent to a sub-microgrid and a controlled current source in parallel, so as to establish the large signal equivalent circuit diagram of the DC microgrid group. The large-signal stability criterion of the DC microgrid group is derived from the mixed potential function theory, and the stability analysis is carried out according to the criterion. Verification by MATLAB/Simulink proves that the DC microgrid group can maintain stable operation if it meets the stability criterion after the constant power load increases.

Key words: DC microgrid group, DC-DC converter equivalent model, microgrid large signal equivalent model, mixed potential function model, mixed potential function criterion, stability criterion analysis, constant power load, stability simulation analysis

CLC Number:

TP274

WANG Yumei,ZHANG Zihan,WANG Hao. Large-Disturbance Stability Analysis of DC Microgrid Based on Mixed Potential Function[J].Electronic Science and Technology, 2022, 35(1): 66-72.

Figures/Tables 11

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Table 2.

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微网1参数	数值	微网2参数	数值
母线电压u_DC1	391 V	母线电压u_DC2	364 V
等效内阻R₁	0.04 Ω	等效内阻R₂	0.03 Ω
等效电感L₁	1 000 μH	等效电感L₂	900 μH
滤波电容C₁	3 000 μF	滤波电容C₂	2 700 μF
光伏功率	4 000 W	光伏功率	3 500 W
负载功率	11 000 W	负载功率	10 500 W
大容量负载阶跃功率	7 000 W	大容量负载阶跃功率	6 000 W
储能功率P_E	6 270.36 W

	ΔP_CPL1	ΔP_CPL2	P_CPL1+ P_CPL2	判据式(21)
情况A	7 000 W	0 W	22 000 W	满足
情况B	0 W	6 000 W	21 000 W	满足
情况C	4 000 W	3 500 W	22 500 W	满足
情况D	7 000 W	6 000 W	28 000 W	不满足

Large-Disturbance Stability Analysis of DC Microgrid Based on Mixed Potential Function

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