Study on Transient Stability of Islanded Microgrid with Induction Motor Load

doi:10.11985/2020.01.002

Abstract

Abstract:

Microgrid is a complex power supply network with various load types. A large number of dynamic loads (such as induction motor) access will inevitably have a significant impact on the transient stability of microgrid. A simple islanded microgrid system is taken as an example to study the influence of induction motor load on its transient stability. Based on the introduction of the microgrid models, the transient instability process of induction motor with different mechanical load types is analyzed. The corresponding simulation model is built in PSCAD/EMTDC, and the critical clearing time of induction motor is obtained through time domain simulation. It is found that the system with induction motor load has already lost transient voltage stability compared with the equivalent constant impedance load in the same fault duration. Moreover, the influence of different parameters on critical clearing time and multiple induction motor on the transient stability of microgrid are analyzed by simulation.

Key words: Islanded microgrid, transient stability, induction motor load, critical clearing time

CLC Number:

TM712

YI Xiangtong,ZHAO Feng,CHENG Huijie,SHUAI Zhikang,SHEN Zheng. Study on Transient Stability of Islanded Microgrid with Induction Motor Load[J]. Journal of Electrical Engineering, 2020, 15(1): 16-22.

Figures/Tables 14

References 15

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参数	数值
参考有功功率P₀₁/kW	40
参考有功功率P₀₂/kW	20
转动惯量J₁/s	15.022
转动惯量J₂/s	2.002
有功下垂系数K_p₁	20
有功下垂系数K_p₂	24
阻尼系数D_p₁	0.01
阻尼系数D_p₂	0.01
延时时间常数τ	0.03
线路阻抗Z_line₁/Ω	0.1+0.16j
线路阻抗Z_line₂/Ω	0.1+0.31j
负荷阻抗Z_load/Ω	4.05+1.26j
电动机视在容量S_IM/kVA	20
电动机惯性时间常数H_m/s	0.2

机械负荷类型T_L/p.u.	惯性时间常数H_m/s	极限故障切除时间/s
0.8	0.1	<0.10
	0.2	0.16
	0.3	0.25
	0.4	0.35

机械负荷类型T_L/p.u.	转子外接电阻R_r/Ω	极限故障切除时间/s
0.8	0.34	0.10
	0.41	0.13
	0.50	0.16

不同容量组合情况	极限故障切除时间/s
1台16 kW的IM	0.16
2台8 kW的IM	0.28
3台5.3 kW的IM	0.45