Power swing and voltage collapse identification schemes for correct distance relay operation in power system

2013 ◽  
Vol 20 (4) ◽  
pp. 988-1000 ◽  
Author(s):  
Ahmad F. Abidin ◽  
Azah Mohamed ◽  
Hussain Shareef
Keyword(s):  
Power System ◽  
Voltage Collapse ◽  
Distance Relay ◽  
Identification Schemes ◽  
Power Swing

Detection of symmetrical fault and discrimination from power swing using MOPSVC approach

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Kumarraja Andanapalli ◽  
Monalisa Biswal
Keyword(s):  
Power System ◽  
Positive Sequence ◽  
Distance Relay ◽  
Security Issues ◽  
Power Swing ◽  
Three Phase ◽  
Sequence Components ◽  
Zero Sequence ◽  
Simulation Task ◽  
Eastern Regional

Abstract Distance relay are designed with swing blocking/tripping logic to maintain reliable and secure operation of power system. To prevent this from happening, the relay is functioned with a power swing blocking (PSB) logic. However, ensuring proper detection to swing event requires to overcome from the dependable situation such as three-phase fault. The relay refuses to behave normally if both swing and three-phase fault occur simultaneously. Reliable setting is essential to generate trip/block command. Unsymmetrical faults are easily detected during the swing condition due to the presence of negative and zero sequence components, but such components are absent in the case of symmetrical/three-phase fault. As a result, symmetrical fault under blocking condition is unidentified many a times by the distance relay, arising security issues. To improve the relay operation during swing and symmetrical fault conditions, a MOPSVC (multiplication of positive sequence voltage and current) based index is developed in this work. The MOPSVC index helps to discern power swing from three-phase fault. To test the efficacy of the method, a 230 kV, 50 Hz two-area four machine system, and Indian Eastern Regional Grid (IERG) network are considered. Simulation task is conducted using EMTDC/PSCAD software. To investigate the performance of the proposed method, various swing phenomena, faults, CT saturation, switching transients, and the presence of noise cases are considered, and the results demonstrate the robustness of the proposed algorithm. Responses under stressed power system conditions are also investigated, and a report on comparisons with existing methods is provided. Simulated results confirm that the proposed algorithm can balance the dependability and security aspects of the protection logic.

scholarly journals An accurate technique for supervising distance relays during power swing

2021 ◽  
Vol 21 (3) ◽  
pp. 1279
Author(s):  
Loai Mohamed Ali El-Sayed ◽  
Doaa Khalil Ibrahim ◽  
Mahmoud Ibrahim Gilany ◽  
Aboul’Fotouh El’Gharably
Keyword(s):  
Power System ◽  
The State ◽  
Distance Relay ◽  
Transient Phenomenon ◽  
Power Swing ◽  
Switching Line ◽  
Power Frequency ◽  
Simulation Results ◽  
Distance Relays ◽  
Line Switching

Power swing is a power system transient phenomenon that arises due to several reasons including line switching, line outage, sudden increment or decrement in load, faults, etc. Unnecessary tripping during power swing and unnecessary blocking for faults occur during power swing result in distance relay maloperation. Several cascaded outages and major worldwide blackouts have occurred due to maloperation of distance relays. This paper proposes a technique for supervising distance relays during power swing. The proposed online technique discriminates real faults and power swing accurately. It relies on constructing a locus diagram for the current and voltage differences (∆I-∆V) between the two ends of the protected line. The locus is estimated at every power frequency cycle to continuously monitor the state of the line by utilizing the synchrophasor measurements at the sending and receiving ends of the line. The proposed technique is tested for two-area, four-machine power system under faults at different locations of zone-1 and zone-2 regions of distance relays, fault resistances, fault inception angles and slip frequencies using MATLAB software. The simulation results proved the superior improvement of distance relay performance for handling power swing blocking and unblocking actions.

Adaptive Distance Protection to Prevent False Relay Tripping during Power Swing

2015 ◽  
Vol 785 ◽  
pp. 358-362
Author(s):  
Nor Zulaily Mohamad ◽  
Ahmad Farid Abidin ◽  
Ismail Musirin
Keyword(s):  
Power System ◽  
Distance Protection ◽  
Distance Relay ◽  
Power Swing ◽  
Adaptive Protection ◽  
Short Circuits

The existing distance relay is accommodated with starting function to detect short-circuits in power system. However, this function proves vulnerable to distance relay operation as it could falsely send a tripping signal during power swing. Hence, it is important to introduce an adaptive concept to the distance protection to prevent such false tripping. This paper presents a simple and effective adaptive protection algorithm for power swing prevention based on Under Impedance Fault Detector (UIFD) characteristics, in which capable to identify the power swing condition and adjusting the relay setting accordingly to avoid system mal-operation.

scholarly journals Power system voltage collapse prediction using a new line stability index (NLSI-1): A case study of the 330-kV nigerian national grid

2019 ◽  
Vol 9 (6) ◽  
pp. 5125
Author(s):  
I. A. Samuel ◽  
J. Katende ◽  
C. O. A. Awosope ◽  
A. A. Awelewa ◽  
A. I. Adekitan ◽  
...  
Keyword(s):  
Power System ◽  
Stability Index ◽  
Base Case ◽  
Voltage Collapse ◽  
Cumulative Number ◽  
The Novel ◽  
A Value ◽  
System Collapse ◽  
The Difference ◽  
Reliability Issue

The cumulative number of historical and recent power system outages substantiates the fact that further studies are necessary for an improved solution to the issue of voltage instability on the grid and the subsequent system collapse. Voltage collapse is a serious reliability issue which inhibits the objective of running a reliable and secure power system network. In this study, a new line stability index (NLSI_1) for predicting voltage collapse is presented.  The new index considers a switching logic which is derived from the difference of voltage angle between the two load buses. The index is deployed for performance analysis using the 28-bus, 330-kV Nigeria National Grid (NNG).  The simulation implemented in MATLAB shows that the index gives the same results as Line stability index (Lmn) and Fast Voltage Stability Index (FVSI) indices. The base case and the contingency scenarios were considered during the simulation. The base case analysis using the NNG values of all the three indices FVSI, Lmn, and NLSI_1 for simulation generates a value less than one for the entire lines which implies that the NNG is stable in this mode. The values of the three indices are almost the same, which confirms the accuracy of the novel index developed. The analysis for the contingency case reveals that the load bus 16 (Gombe) which has the lowest, maximum permissible reactive load of 139.5MVAR is the weakest; also power line 16-19 is identified as the critical line. The result of the simulation confirms that the accuracy was improved by using NLSI_1.

ON EFFICIENT METHODS FOR DETECTING HOPF BIFURCATION WITH APPLICATIONS TO POWER SYSTEM INSTABILITY PREDICTION

2003 ◽  
Vol 13 (05) ◽  
pp. 1247-1262 ◽  
Author(s):  
A. HUSSEIN ◽  
K. CHEN
Keyword(s):  
Hopf Bifurcation ◽  
Power System ◽  
Voltage Collapse ◽  
Test Functions ◽  
Index Method ◽  
Test Function ◽  
Power System Operations ◽  
Efficient Measurement ◽  
Loading Parameter ◽  
Current Operating

Efficient measurement of the performance index (the distance of a loading parameter from the voltage collapse or instability point) is one of the key problems in power system operations and planning such an index indicates the severity of a power system with regard to voltage collapse or instability. While much work has been done on the former problem, the latter problem poses a more severe challenge both to the engineering and mathematical communities. This paper first presents a review of the main methods for detecting Hopf bifurcation in the general field of bifurcation theory and then attempts to generalize the previously studied fold detection and index methods to the Hopf case. The proposed Hopf test functions should be of wide interest while the proposed test function based index method gives an indication of the distance of the current operating point from the Hopf instability. Promising numerical results have been obtained using some standard dynamical test systems.

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