Robust control design of PSS for dynamic stability enhancement of power system

A Sliding Mode Controller (SMC) is adopted in this work with a Proportional Integral Derivative (PID) to achieve robust control signal and employ it instead of Power System Stabilizer (PSS). The major technique is basically focusing on the control accuracy. The main proposal is that the effective property of PID and high characteristics of SMC are combined to eliminate the chattering effect of SMC in order to generate best control signal to the excitation system. Speed deviation is chosen as sliding variables. The robust design of SMC-PID has been employed to enhance the power system stability and further to damp out strongly the system oscillations that caused by the disturbances. In order to validate the robustness of the mentioned scheme, the proposed proposition is evaluated on Single Machine Infinite Bus (SMIB) power system under different perturbations with pre-specified operating condition. For comparison, the tested power system is carried separately through different designed controllers. The simulation results have demonstrated the high performance of mentioned controller that attained best results compared to various controllers

Robust Design of Power System Stabilizers Using Improved Harris Hawk Optimizer for Interconnected Power System

In this present work, a new metaheuristic method called a Harris hawk optimizer (HHO) is applied to achieve the optimal design of a power system stabilizer (PSS) in a multimachine power system. Several well-known chaos maps are incorporated into the HHO to form a chaotic HHO (CHHO) with the aim of improving static operators and enhancing global searching. To assess the CHHO performance, exhaustive comparison studies are made between anticipated chaotic maps in handling unconstrained mathematical problems. At this moment, The PSS design problem over a wide permutation of loading conditions is formulated as a non-linear optimization problem. The adopted objective function defines the damping ratio of lightly damped electromechanical modes subject to a set of constraints. The best PSS parameters are generated by the proposed CHHO. The applicability of the proposed CHHO based on PSS is examined and demonstrated on a 10-generator and 39-bus multimachine power system model. The performance assessments of the CHHO results are realized by a comparative study with HHO through extensive simulations along with further eigenvalue analysis to prove its efficacy. The simulation results convincingly demonstrate the high performance of the proposed CHHO-PSS under various operating scenarios