Adaptability Analysis and Countermeasures for Distance Protection of AC Transmission Lines Connected LCC-HVDC Inverter Station

doi:10.11930/j.issn.1004-9649.202309110

Abstract

Abstract:

The AC transmission line fault near the LCC-HVDC inverter station might lead to commutation failure. And fault voltage and current waveforms would be distorted. It will have an adverse effect on the performance of fundamental power frequency phasor based distance protection. Firstly, the performance of traditional distance protection based on positive-sequence voltage polarization which is widely used in practice is analyzed. If the LCC-HVDC inverter station only has the single AC transmission outgoing line, distance protection based on positive-sequence voltage polarization would no longer be applicable. Then, based on the RL model of AC transmission line, a time domain distance protection based on waveform correlation coefficient is proposed. It is not affected by the nonlinear output characteristics of LCC-HVDC inverter station. To solve the fault direction identification problem near the exit area, the index of current distortion is defined to identify the fault direction. Finally, the proposed time domain distance protection is verified by the simulation results.

Key words: LCC-HVDC inverter station, AC transmission line, time domain distance protection, waveform correlation coefficient, degree of current distortion

Huixin LI, Xiangwen CHEN, Mingliang JIN, Yang LIU, Haiyang XU. Adaptability Analysis and Countermeasures for Distance Protection of AC Transmission Lines Connected LCC-HVDC Inverter Station[J]. Electric Power, 2024, 57(2): 115-126.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202309110

https://www.electricpower.com.cn/EN/Y2024/V57/I2/115

Figures/Tables 19

Fig.1 The LCC-HVDC inverter station connected system

Fig.2 Equivalent positive sequence network for single-phase to ground fault

Fig.3 Voltage instantaneous value distribution

Fig.4 Influence of the fault resistance.

Fig.5 The distance protection scheme flow

Table 1 Parameters of AC transmission line

正序电阻/ (Ω·km^–1)		正序电感/ (mH·km^–1)		正序电容/ (μF·km^–1)		零序电阻/ (Ω·km^–1)		零序电感/ (mH·km^–1)		零序电容/ (μF·km^–1)
0.02		0.892		0.0133		0.249		3.096		0.00887

Fig.6 Simulation results with strong equivalent source EM

Fig.7 Simulation results without equivalent source EM

Fig.8 Simulation results of N side protection under reverse fault conditions

Fig.9 Simulation results under the aG internal fault condition with strong equivalent source EM

Fig.10 Simulation results under the aG internal fault without equivalent source EM

Table 2 Simulation results with different fault location

故障位置	故障类型	相关系数	判断结果	故障位置	故障类型	相关系数	判断结果
20 km	aG	–0.98	区内	60 km	aG	–0.96	区内
	ab	–0.99	区内		ab	–0.97	区内
	abG	–0.99	区内		abG	–0.97	区内
	abc	–0.99	区内		abc	–0.97	区内
40 km	aG	–0.97	区内	90 km	aG	0.83	区外
	ab	–0.98	区内		ab	0.84	区外
	abG	–0.98	区内		abG	0.84	区外
	abc	–0.98	区内		abc	0.84	区外

Fig.11 Simulation results under the forward fault condition near protection location with strong equivalent source EM

Fig.12 Simulation results under forward fault conditions near protection location without equivalent source EM

Fig.13 Simulation results under forward fault conditions near protection location without equivalent source EM

Fig.14 Simulation results with 10 ms time window

Fig.15 Simulation results under internal aG fault conditions with resistance

Fig.16 Simulation results under internal ab fault conditions with resistance

Fig.17 Simulation results under external aG fault conditions with resistance

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