Time frequency response-based current differential protection of wide area compensated power system networks

2017 ◽  
Vol 8 (4) ◽  
pp. 357
Author(s):  
Rajesh Kumar Patnaik ◽  
Okram Dharmapandit
Keyword(s):  
Power System ◽  
Frequency Response ◽  
Wide Area ◽  
Differential Protection ◽  
Time Frequency ◽  
Current Differential Protection

scholarly journals An Adaptive Differential Protection and Fast Auto-Closing System for 10 kV Distribution Networks Based on 4G LTE Wireless Communication

2019 ◽  
Vol 12 (1) ◽  
pp. 2 ◽  
Author(s):  
Wen An ◽  
Jun Jie Ma ◽  
Hong Yang Zhou ◽  
Hong Shan Chen ◽  
Xu Jun ◽  
...  
Keyword(s):  
Control System ◽  
Wireless Communication ◽  
Power System ◽  
Power Supply ◽  
Distribution Networks ◽  
Fault Isolation ◽  
Differential Protection ◽  
Current Differential Protection ◽  
Protection And Control ◽  
And Control

With the development of wireless communication technology and computer technology, more and more smart technologies have been applied in electricity distribution networks. This paper presents an adaptive current differential protection and fast auto-closing system for application in 10 kV distribution networks in China Southern Power Grid. The current differential protection can adaptively change its settings according to the topology change of the primary distribution networks, thus the system effectively reduces the operation and maintenance cost of the power distribution network. In order to restore the power supply for the healthy part of the 10 kV networks quickly after a power system fault is cleared, the protection and control system provides wide area control function for automatic fault isolation and automatic switching. The traditional overcurrent protection and control system have no fault location function, it may take several minutes or even hours to manually locate a fault and then restore the power supply. Compared with the protection and control system of the traditional 10 kV distribution networks, the system developed can locate and isolate faults within 900 ms (assuming that the operating time of the load switch is 700 ms), and can quickly restore power supply in less than one second after a power system fault is cleared.

Wide-Area Backup Protection Algorithm Based on Earth Impedance Comparison Principle

2014 ◽  
Vol 513-517 ◽  
pp. 858-862
Author(s):  
Zhen Xing Li ◽  
Qiu Li ◽  
Tao Zhang
Keyword(s):  
Area Measurement ◽  
Wide Area ◽  
Differential Protection ◽  
Circuit Breakers ◽  
Backup Protection ◽  
Wide Area Measurement System ◽  
Component Identification ◽  
Current Differential Protection ◽  
Protective Relays ◽  
Bus Voltage

A novel algorithm is proposed for the purpose of improving the reliability and sensibility of fault component identification of wide area backup protection. The algorithm, called earth impedance comparison protection (EICP), is realized by comparing the ratios of different nodes, and the ratio is obtained by the bus voltage to the differential current. The advantages of EICP are verified in this paper using the measurement function of wide-area measurement system. The results of case studies show that EICP is superior to the current differential protection in terms of the sensitivity and to the directional pilot protection in terms of the dependability. The satisfactory results can be obtained when the EICP method is applied in the event of abnormal operations of protective relays and circuit breakers, measurement error scenarios or substation DC failure.

scholarly journals A review of the protection for the multi-terminal VSC-HVDC grid

2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Bin Li ◽  
Jiawei He ◽  
Ye Li ◽  
Botong Li
Keyword(s):  
Power System ◽  
Power Supply ◽  
Traveling Wave ◽  
Differential Protection ◽  
Protection Strategy ◽  
Current Differential Protection ◽  
The Future ◽  
Dc Line ◽  
Supply Reliability ◽  
Pilot Protection

AbstractThe multi-terminal VSC-HVDC grid is believed to be widely applied in the future power system. The dc line protection is the key technique for operation security and power supply reliability of the dc grid. In this paper, the single-ended protections, namely, the traveling-wave based protection and transient-variable based protection, as well as the pilot protections, mainly including the directional pilot protection and current differential protection, are discussed in detail. With the analyzed protections, the effective main and back-up protection strategy can be configured for the dc line in multi-terminal VSC-HVDC grid.

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