Rate of Change of Active Power as a Power Swing Blocking Function of Distance Relays

2022 ◽  
Vol 20 (2) ◽  
pp. 259-268
Author(s):  
Gustavo Marchesan ◽  
Carlos Lazaro ◽  
Ghendy Cardoso Junior ◽  
Luiz Fernando Freitas-Gutierres ◽  
Adriano Peres de Morais
Keyword(s):  
Active Power ◽  
Rate Of Change ◽  
Power Swing ◽  
Distance Relays

Distance Relaying with Power Swing Detection based on Voltage and Reactive Power Sensitivity

2016 ◽  
Vol 17 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Ujjaval J. Patel ◽  
Nilesh G. Chothani ◽  
Praghnesh J. Bhatt
Keyword(s):  
Reactive Power ◽  
Synchronous Generator ◽  
Power Input ◽  
Parallel Line ◽  
Rate Of Change ◽  
Electrical Network ◽  
Distance Relay ◽  
Heavy Load ◽  
Power Swing ◽  
Distance Relaying

Abstract Sudden changes in loading or configuration of an electrical network causes power swing which may result in an unwanted tripping of the distance relay. Hence, it becomes utmost necessary to rapidly and reliably discriminate between actual fault and power swing conditions in order to prevent instability in power network due to mal operation of distance relay. This paper proposes a novel method for the discrimination between fault and power swing based on rate of change of voltage and reactive power measured at relay location. The effectiveness of the proposed algorithm is evaluated by simulating series of power swing conditions in PSCAD/EMTDC® software for different disturbances such as change in mechanical power input to synchronous generator, tripping of parallel line due to fault and sudden application of heavy load. It is revealed that the distance relay gives successful tripping in case of different fault conditions and remains inoperative for power swing with the implementation of the proposed algorithm. Moreover, the proposed scheme has ability to distinguish the symmetrical and asymmetrical fault occurrence during power swing condition.

Intelligent Power Swing Detection Scheme to Prevent False Relay Tripping Using S-Transform

2014 ◽  
Vol 15 (3) ◽  
pp. 291-298 ◽  
Author(s):  
Nor Z. Mohamad ◽  
Ahmad F. Abidin ◽  
Ismail Musirin
Keyword(s):  
Signal Processing ◽  
Wavelet Transform ◽  
Active Power ◽  
Measurement Point ◽  
Distance Relay ◽  
Detection Scheme ◽  
Power Swing ◽  
S Transform ◽  
Unstable Part ◽  
Intelligent Approach

Abstract Distance relay design is equipped with out-of-step tripping scheme to ensure correct distance relay operation during power swing. The out-of-step condition is a consequence result from unstable power swing. It requires proper detection of power swing to initiate a tripping signal followed by separation of unstable part from the entire power system. The distinguishing process of unstable swing from stable swing poses a challenging task. This paper presents an intelligent approach to detect power swing based on S-Transform signal processing tool. The proposed scheme is based on the use of S-Transform feature of active power at the distance relay measurement point. It is demonstrated that the proposed scheme is able to detect and discriminate the unstable swing from stable swing occurring in the system. To ascertain validity of the proposed scheme, simulations were carried out with the IEEE 39 bus system and its performance has been compared with the wavelet transform–based power swing detection scheme.

Preventing third zone maloperation during power system stressed conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kasimala Venkatanagaraju ◽  
Monalisa Biswal
Keyword(s):  
New England ◽  
Average Rate ◽  
Test System ◽  
Rate Of Change ◽  
Distance Relay ◽  
Power Cycle ◽  
Power Swing ◽  
Protective Relay ◽  
Three Phase ◽  
Nuisance Tripping

Abstract The back-up third zone unit of distance relay may issue nuisance tripping command during different system critical events like power swing, voltage stress/instability and load encroachment. Since, such events are system symmetry phenomenon, the protection unit will not always able to discern them from three phase (symmetrical) fault in the distance relay third-zone region. The conventional relay algorithm fails to make a proper decision and results in unwanted tripping. This may further lead to system blackout. To mitigate this problem, a new approach based on the average rate of change of current (ARCC) is proposed. The method will work in integration with the conventional distance relay impedance setting algorithm to provide better results. The main advantage of the method is that it considers only local end current information. Within one power cycle, an accurate decision can be taken by the protective relay. The proposed method is validated considering IEEE 39-bus New England test system and the Indian regional power grid model modeled using EMTDC/PSCAD software. The simulation results for various critical cases and comparative analysis with existing methods shows effectiveness of the proposed method.

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