An adaptive supervised wide-area backup protection scheme for transmission lines protection

Abstract

Maloperation of conventional relays is becoming prevalent due to ever increase in complexity of conventional power grids. They are dominant during power system contingencies like power swing, load encroachment, voltage instability, unbalanced loading, etc. In these situations, adaptive supervised wide-area backup protection (ASWABP) plays a major role in enhancing the power system reliability. A balance between security and dependability of protection is essential to maintain the reliability. This paper proposes multi-phasor measurement units (MPMU) based ASWABP scheme that can function effectively during faults besides power system contingencies. MPMU is an extended version of Phasor Measurement Unit (PMU). It is an intelligent electronic device which estimates the synchronized predominant harmonic phasors (100Hz and 150Hz) along with the fundamental phasors (50Hz) of three phase voltages and currents with high precision. The proposed ASWABP scheme can detect the fault, identify the parent bus, determine the faulty branch and classify the faults using MPMU measurements at System Protection Center (SPC). Based on these MPMU measurements (received at phasor data concentrator (PDC) at SPC) the appropriate relays will be supervised to enhance the overall reliability of the power grid. Numerous case studies are conducted on WSCC-9 bus and IEEE-14 bus systems to illustrate the security and dependability attributes of proposed ASWABP scheme in MATLAB/Simulink environment. Also, comparative studies are performed with the existing conventional distance protection (Mho relays) for corroborating the superiority of the proposed scheme regarding security and dependability. Comparative studies have shown that the proposed scheme can be used as adaptive supervised wide-area backup protection of conventional distance protection.

A security enabled real time fault detection and classification of power system conditions

“…Also, adaptive techniques based on various parameters to upgrade the security of protection of relay operation are found in the literature. Mallikarjuna et al proposed multi-phasor measurement units (MPMU) based adaptive supervised wide-area backup protection (ASWABP) scheme that can work adequately during faults besides the contingencies of the power system [11]. Jin and Sidhu [12] Avinash et al [13] Azari [14] Dubey et al [15] Khodaparast and Khederzadeh [16].…”

“…But the models were tested with the different test sample collected during the time duration 1 to 1.5s (for load increase by 500 MW at 4th bus at 1s). This was nothing but a power swing condition (in the neighbouring line [4][5][6][7][8][9][10][11][12][13][14]. Offline techniques may fail to predict the condition because it was not trained for that pattern.…”

Key Technology of Wide-Area Backup Protection of Intelligent DC Power Networks Based on Fault Identification

“…is was the rst time that the concept of widearea protection was introduced to relay protection, emphasizing the use of wide-area information to improve the performance of the support system. Mallikarjuna et al [8] proposed a multiphase measurement unit (MPMU) based on the ASWABP scheme to improve the safety and stability of the power system. is approach allows monitoring of standby security using a wide range as in conventional range security.…”

Remote monitoring system for real time detection and classification of transmission line faults in a power grid using PMU measurements

“…Such backup system plays a crucial role during power grid fault conditions and protection system breakdowns [1][2][3][4][5]. Hence, such methodologies are gaining much research attraction in recent years [6][7][8][9][10][11].…”