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Abstract
The role of Power System Stabilizer (PSS) in the power system is to provide necessary damping torque to the system in order to suppress the oscillations caused by a variety of disturbances that occur frequently and maintain the stability of the system. In this paper, a PSS design technique is proposed using Whale Optimization Algorithm (WOA) by considering eigenvalue objective function. Two bench mark multi machine test systems: three- generator nine- bus system, two- area four- generator inter connected system working on various operating conditions are considered as case studies and tested with the proposed technique. Extensive simulation results are obtained and effectiveness of proposed WOA-PSS are compared with well - known PSO and DE based stabilizers under several disturbances.
Highlights
Operation and control of the power system under various operating conditions and configurations is always a challenging, difficult task to the power system engineers as it suffers from a variety of disturbances
Power system stabilizer is connected at each generator and a sustained three phase fault is created at the midpoint of the line to test the performance of the proposed technique
Performance plots of four generators with Whale Optimization Algorithm (WOA), DE and PSO based power system stabilizers are shown in Figs. 13, 14, 15, 16, 17, 18 and 19 under severe sustained three phase fault at t = 10 s condition. It can be seen from the simulation results that the oscillations at generator one, generator two, generator three and generator four of two area systems are reduced and settled in a lesser time when the Power System Stabilizer (PSS) are designed with WOA than the other stabilizers
Summary
Operation and control of the power system under various operating conditions and configurations is always a challenging, difficult task to the power system engineers as it suffers from a variety of disturbances. Oscillations in the range of low frequencies have considerable effect on the system dynamic stability To counter these disturbances, PSS is developed as an auxiliary controller to damp out these oscillations by providing sufficient damping torque to the system [1, 2]. Coordinated fixed gain PSS tuning on a wide range of operating conditions is given in [6] In line with these methods, various PSS design techniques are developed from the last few decades, which includes robust control techniques [7, 8], sliding mode control techniques [9,10,11] optimization methods [12,13,14], H∞ techniques [15, 16], artificial intelligence techniques based PSS is given in [17,18,19]. The proposed design technique would become better substitute to the conventional stabilizers, as they need lots of calculations for the design purpose, when the power system operates on variable operating conditions
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