A Robust PSS Design using GWO in a 3 Machine 9 Bus System

Hema Mali
2019 International Journal for Research in Applied Science and Engineering Technology  
Disturbances due to low frequency oscillations are quite common in power system and it has been dealt with many methods. The most popular among is the inclusion of Conventional Power System Stabilizers (CPSS). Also, the problem has been addressed with other devices too. In the current context of work, CPSS is used too for addressing the low frequency oscillation problems. The CPSS with two stage lead lag block is employed here. As it is well known that to have the better performance from it
more » ... ormance from it number of optimization methods has already been used so as to optimize its parameters. Here, the use of novel technique named Grey Wolf Optimization (GWO) has been used for the same. To test the combination of above two the system considered is 3 machine 9 bus system. Hence power system is modeled as 3 machine 9 bus. It has been tested under three different scenario each with four cases namely base case, case 1, case 2 and case 3. The scenarios are 6 cycle three phase fault disturbances, step increase in mechanical power and combination of two at extreme loading conditions. For each case power values and loadings are different. Here, a deviation of speed is considered in the operation of two machines out three. The simulation of model has been done through MATLAB/Simulink. The test system has been simulated without any controller, with CPSSs and with GWOCPSSs controller. The results obtained in the different case of studies has been compared and tabulated so as to check and verify how quickly system settles and stabilizes for wide range of operating conditions. In the given way the given controller effectiveness and robustness was tested too.
doi:10.22214/ijraset.2019.4461 fatcat:uttvgdy7bjgpdeg5vy6qku6h6m