A novel AC line distance protection scheme for AC/DC hybrid system based on fault likeness factor

Abstract

Concerning the mal‐operation of distance protection in AC/DC hybrid system due to commutation failure in DC system caused by AC‐side fault, a novel AC line distance protection scheme based on fault likeness factor is proposed. First, by analysing the conducting state of converter in different time intervals, the expression of feed‐in current from DC system to AC system is derived. On this basis, combining AC‐side fault component network, the fault location equation considering the impact of feed‐in current from DC system is established. Thus, by solving the equation consisting of information at multiple time sections, the fault location is calculated. And then, according to the consistency between the calculated fault location and actual fault location, the fault likeness factor is constructed to distinguish between in‐zone and out‐of‐zone faults. Finally, simulation tests in RT‐LAB verify that, the proposed scheme can identify in‐zone and out‐of‐zone faults fast and accurately in the case of commutation failure caused by different types of fault, strongly immune to fault resistance.

Hybrid Multi-Infeed Receiver Line Longitudinal Protection Scheme Based on Voltage Waveform Comprehensive Distance Similarity

“…Additionally, Huang et al [ 15 ] presented a rapid fault detection method based on instantaneous active power and fault transient components to alleviate the effects of commutation failures and reactive power compensation. Ma et al [ 16 ] used time-domain differential equations to calculate fault point location, enhancing the protective performance of fault distance measurement, but with poor anti-interference capabilities that are unable to protect the entire length of the line. Moreover, Zheng et al [ 17 ] analyzed the impact of non-periodic components and harmonic components caused by DC feeding on the accuracy of algorithms, resulting in decreased protective operation performance.…”

Hybrid Multi-Infeed Receiver Line Longitudinal Protection Scheme Based on Voltage Waveform Comprehensive Distance Similarity

“…Additionally, Huang et al [16] presented a rapid fault detection method based on instantaneous active power and fault transient components to alleviate the effects of commutation failures and reactive power compensation. Ma et al [17] used time-domain differential equations to calculate fault point location, enhancing the protective performance of fault distance measurement, but with poor anti-interference capabilities that are unable to protect the entire length of the line. Moreover, Zheng et al [18] analyzed the impact of non-periodic components and harmonic components caused by DC feeding on the accuracy of algorithms, resulting in decreased protective operation performance.…”