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Abstract
The integration of system compensation such as Series Compensator (SC) into the transmission line makes the coordination of directional overcurrent in a practical power system important and complex. This article presents an efficient variant of Particle Swarm Optimization (PSO) algorithm based on Time-Varying Acceleration Coefficients (PSO-TVAC) for optimal coordination of directional overcurrent relays (DOCRs) considering the integration of series compensation. Simulation results are compared to other methods to confirm the efficiency of the proposed variant PSO in solving the optimal coordination of directional overcurrent relay in the presence of series compensation.
Highlights
Overcurrent protection could be used as the primary protection in distribution or sub-transmission networks
In this paper the coordination time interval CTI is taken as 0.2 s, and the time dial setting (TDS) values can change continuously from 0.1 to 1.1 while pickup tap setting PTS values can change continuously from 0.5 to 2.5 are considered [10].The ratio current transformer of relays (1, 2, 4, 5, 6, 8, 10, 11, 12, 13) and (3, 7, 9, 14) are assumed as (1200/5) and (800/5) respectively
Case 3: In this case, the Particle Swarm Optimization (PSO)-TVAC algorithm is applied for optimal coordination of directional overcurrent relays (DOCRs) considering series compensation (SC)
Summary
Overcurrent protection could be used as the primary protection in distribution or sub-transmission networks. Many standard optimization methods and hybrid variants based on metaheuristic algorithms have been proposed and applied with success for solving many complex problems related to power system protection coordination [7]. Many papers have been proposed to solve the optimal coordination of directional relay considering the series compensation. Compared with GA, PSO has some attractive characteristics It has a memory, so knowledge of good solutions is stored by all particles; whereas in GA, previous knowledge of the problem is destroyed once the population changes. In this paper an adaptive variant of PSO named PSO-TVAC is proposed and adapted to solve the optimal coordination of directional overcurrent relays (DOCRs) considering the impact of series compensation (SC).
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