Optimizing controller's parameters for exciters and different wind turbines to enhance small signal and transient stability of power system

Abstract

The objective of this paper is to show the effects of proper design of controller's parameters on transient and small signal stability of the power system, in presence of Distributed Energy Resources (DER) for power system stability analysis issues. Differential and algebraic equations of various DGs and conventional synchronous generators are formulated together with dynamics of other elements, such as exciters and wind turbines (WT). Two types of Wind turbines used in these investigations, (1) Doubly Fed Induction Generator (DFIG) (2) constant speed wind turbine (CSWT). The results are applied for stability studies of a power system i.e. Modified IEEE 14 bus test system to demonstrate a typical application. Results shows that there is an appropriate impact on stability control of the power system with optimization of controllers for excitation system of conventional power system, and also when wind turbine integrated to system in the typical power system. Therefore if it will be possible to change different input variables or parameters of system model in theory or application, we can control oscillations, by controlling and monitoring either inter-area or intra-area modes, online. We show this online variation of parameters in simulation, by repeating the power flow and transient time domain analysis for several times, assuming different parameter values in each iteration in a loop, and then run another optimaization program to find the best values for parameters that damps the oscillations and enhances the stability of the proposed power system.