Harmonic Differential Protection Scheme Based on Characteristic Signal Injection for Distribution Network with IIDG

doi:10.11985/2023.01.020

Abstract

Abstract:

After the inverter interfaced distributed generation(IIDG) is connected, the distribution network becomes a complex multi-source system, which also changes the traditional power flow structure, operation mode and fault characteristics of the distribution network. Taking advantage of the positive factors of IIDG access to protection, the active action mechanism of IIDG grid-connected inverters is constructed. A harmonic differential protection scheme for distribution network with IIDG based on characteristic signal injection is proposed, which makes the protection more flexible through the active participation of IIDG. Constrained by the power quality of the IIDG PCC point and the output power limit of the IIDG, the characteristic high-order harmonic signal is injected into the inner current loop of the IIDG, and the activation time and effective period of active signal regulation are determined. Based on this, the harmonic current content differential protection scheme is proposed, and the rationality of the proposed protection scheme is verified by simulation.

Key words: Harmonic differential protection, characteristic signal injection, inverter interfaced distributed generation, active protection

CLC Number:

TM773

YANG Liming, ZHOU Haoliang, ZHU Zhenhong. Harmonic Differential Protection Scheme Based on Characteristic Signal Injection for Distribution Network with IIDG[J]. Journal of Electrical Engineering, 2023, 18(1): 181-187.

Figures/Tables 11

References 14

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参数		数值
参数		AB线路	AC线路	CD线路
单相接地	ΔHRI_hset(%)	0.1	1.5	0.1
	ΔHRI_hf(%)	ΔHRI_hAB =0.16	ΔHRI_hAC=2.41	ΔHRI_hCD=0.17
	动作情况	动作	动作	动作
两相相间	ΔHRI_hset(%)	0.1	1.5	0.1
	ΔHRI_hf(%)	ΔHRI_hAB =0.17	ΔHRI_hAC=1.74	ΔHRI_hCD=0.18
	动作情况	动作	动作	动作
三相接地(金属性)	ΔHRI_hset(%)	0.1	1.5	0.1
	$\Delta HR{{I}_{hf}}$	ΔHRI_hAB=0.21	ΔHRI_hAC=3.09	ΔHRI_hCD=0.23
	动作情况	动作	动作	动作
三相接地(R_f=0 Ω)	ΔHRI_hset(%)	0.1	1.5	0.1
	ΔHRI_hf(%)	ΔHRI_hAB=0.13	ΔHRI_hAC=2.12	ΔHRI_hCD=0.013
	动作情况	动作	动作	动作