Flexible kinetic energy release controllers for a wind farm in an islanding system
Journal
Energies
Journal Volume
13
Journal Issue
22
Date Issued
2020
Author(s)
Chen Y.-W
Abstract
To improve frequency nadir following a disturbance and avoid under-frequency load shedding, two types of flexible kinetic energy release controllers for the doubly fed induction generator (DFIG) are proposed. The basic idea is to release only a small amount of kinetic energy stored at the DFIG in the initial transient period (1–3 s after the disturbance). When the frequency dip exceeds a preset threshold, the amount of kinetic energy released is increased to improve the frequency nadir. To achieve the goal of flexible kinetic energy release, a deactivation function based integral controller is first presented. To further improve the dynamic frequency response under parameter uncertainties and external disturbances, a second flexible kinetic energy release controller is designed using a proportional-integral controller, with the gains being adapted in real-time with the particle swarm optimization algorithm. Based on the MATLAB/SIMULINK simulation results for a local power system, it is concluded that the frequency nadir can be maintained around the under-frequency load shedding threshold of 59.6 Hz using the proposed controllers. ? 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Subjects
Asynchronous generators; Controllers; Distributed power generation; Electric fault currents; Electric load shedding; Electric power plant loads; Frequency response; Kinetic energy; Kinetics; MATLAB; Particle swarm optimization (PSO); Two term control systems; Wind power; Doubly fed induction generators; External disturbances; Kinetic energy release; Matlab/Simulink simulation; Parameter uncertainty; Particle swarm optimization algorithm; Proportional integral controllers; Underfrequency load-shedding; Electric machine control
Doubly fed induction generator (DFIG); Kinetic energy; Load frequency control (LFC); Particle swarm optimization; Wind farm
SDGs
Other Subjects
Asynchronous generators; Controllers; Distributed power generation; Electric fault currents; Electric load shedding; Electric power plant loads; Frequency response; Kinetic energy; Kinetics; MATLAB; Particle swarm optimization (PSO); Two term control systems; Wind power; Doubly fed induction generators; External disturbances; Kinetic energy release; Matlab/Simulink simulation; Parameter uncertainty; Particle swarm optimization algorithm; Proportional integral controllers; Underfrequency load-shedding; Electric machine control
Type
journal article