Research on the Effect of IIDG on Local Feeder Protection

doi:10.12096/j.2096-4528.pgt.19001

Abstract

Abstract:

Because of its outstanding performance in economic benefit and environmental benefit, the inverter interfaced distributed generation (IIDG) has been widely used in distribution network. The access of IIDG makes the distribution network a complex network of multi-power supply, the bidirectional power flow may lead to the degradation of feeder automation performance based on undirectional power flow, and it is imposssible to isolate faults in time. Aiming at two typical application on overhead lines feeder automation implementation pattern: voltage time type feeder automation and current differential type feeder automation, discussed its working principle, considering the working principle of IIDG, the influence of IIDG's penetration on fault isolation and non-faulty area recovery in each feeder automation mode was analyzed in detail. The solution to reduce the impact of IIDG was proposed and the simulation was verified.

Key words: inverter interfaced distriuted generation (IIDG), bidirectional power flow, feeder automation, volatage-time feeder automation, current-level differential feeder automation

CLC Number:

TK01
TM726

Jingsong DENG, Yingmin WANG, Difei SUN, Chenling ZHENG, Hanting YAN, Xiaojing GAO. Research on the Effect of IIDG on Local Feeder Protection[J]. Power Generation Technology, 2021, 42(1): 115-121.

Figures/Tables 9

Fig.1 Circuit diagram of a typical radial distribution network

Fig.2 The action sequence of switches when a short circuit occurs at f2

Fig.3 The action sequence of switches when a short circuit occurs at f1

Fig.4 The circuit diagram of a typical hand held loop network

Fig.5 The action sequence of switches when a short circuit occurs at f1

Fig.6 The simulation of distribution network before and after installation of anti-island protection device

Fig.7 The diagram of feeder automation connection with current gradient

Tab. 1 The setting of each protection

开关	Ⅰ段		Ⅱ段		Ⅲ段
开关	电流/A	时间/s	电流/A	时间/s	电流/A	时间/s
CB	2 400	0.3	1 200	0.5	350	1.5
A	—	—	1 700	0.3	170	1.2
B	—	—	1 400	0.3	105	0.9
D	—	—	900	0.1	82	0.6
E	—	—	900	0.1	41	0.6
F	—	—	900	0.1	95	0.6

Tab. 2 IIDG's capacity under sensitivity constraints

参数	IIDG容量/(MV·A)	流过保护的电流/A
开关CB的灵敏性约束	1.0	453
开关A的灵敏性约束	1.9	217
开关B的灵敏性约束	2.1	136

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