scholarly journals Detection of fault during power swing in test system interconnected with DG

2019 ◽  
Vol 16 (2) ◽  
pp. 577
Author(s):  
Nor Zulaily Mohamad ◽  
Ahmad Farid Abidin ◽  
Ismail Musirin
Keyword(s):  
Distributed Generation ◽  
High Resistance ◽  
Input Voltage ◽  
Test System ◽  
Distance Relay ◽  
Detection Scheme ◽  
Power Swing ◽  
S Transform ◽  
Voltage Signal

<span>Distance relay is prone to mal-operate during power swing, thus most of modern distance relay design is equipped with power swing blocking scheme to block the operation during power swing and reset the blocking operation whenever a fault occurs during power swing. However, the detection of fault during power swing especially for high resistance fault possess a challenging task, therefore it may cause the unblocking function to vulnerable to operate. This paper presents the development of a detection scheme for detecting fault during power swing in test system interconnected with Distributed Generation (DG). In this study, the detection scheme is proposed based on S-Transform analysis on the distance relay input voltage signal. It is demonstrated that the proposed S-Transform detection based scheme can effectively detect various type of fault during power swing includes high resistance fault, as well as able to operate correctly even with the presence of DG in the test system.</span>

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.

A New Blocking Scheme for Distance Protection during Power Swings

2010 ◽  
Vol 11 (1) ◽  
Author(s):  
Ahmad Farid Abidin ◽  
Azah Mohamed ◽  
Hussain Shareef
Keyword(s):  
Fast Algorithm ◽  
Reactive Power ◽  
Test System ◽  
Software Test ◽  
Test Results ◽  
Distance Protection ◽  
Distance Relay ◽  
Additional Criterion ◽  
Power Swing ◽  
Power Swings

This paper presents a new and fast algorithm to prevent distance relay mal-operation during power swings. The algorithm blocks the relay tripping signals during power swing and unblocks the signals if a fault occurs during power swing. The proposed blocking scheme for distance protection incorporates an additional criterion into the conventional relay which is based on the derivative of the line reactive power as seen by the relay. This technique overcomes the shortcoming of conventional power swing detector (PSD) by removing the pre-defined R-X diagram. The conventional PSD has the difficulty in obtaining the timer setting at pre-defined R-X diagram due to varying cycle of power swings. To illustrate the effectiveness of the proposed algorithm, simulations were carried out on the IEEE 39 bus test system using the PSS/E software. Test results show the effectiveness of the proposed scheme in blocking the relay’s false trip signals during power swing.

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