Robust H-infinity load frequency control in hybrid distributed generation system

• Published in: International journal of electrical power & energy systems Vol. 46; pp. 294 - 305
• Main Authors: Singh, Vijay P., Mohanty, Soumya R., Kishor, Nand, Ray, Prakash K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2013; Elsevier
• Subjects: Applied sciences; Control systems; Direct energy conversion and energy accumulation; Distributed generation; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Frequency control; Frequency deviation; Frequency regulation; Fuel cells; Generators; Genetic algorithms; H-infinity control; H-infinity controller; Hybrid system; Hybrid systems; Miscellaneous; Particle swarm optimization; Regulation and control; Special rotating machines; Storage units; Swarm intelligence; Storage units; Distributed generation; H-infinity controller; Particle swarm optimization; Frequency regulation; Hybrid system; Acoustic emission testing; Performance evaluation; Wind generator; Distributed power generation; Frequency control; Supercapacitor; Fuel cell; Superconducting magnet energy storage; Acoustic measurement; Control system; Diesel engine; Load frequency control; Power electronics; Electrolytic capacitor; Distributed system; Genetic algorithm; Internal combustion engine; Electric power production; Turbine generator; Superconducting magnetic energy storage; Comparative study; Energy storage
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/j.ijepes.2012.10.015

► Paper presents study on isolated hybrid DG system to improve frequency deviation. ► Study is addressed for DG system connected with storage units; SMES or UC. ► Results demonstrate minimum frequency deviation achieved by proposed controller with use of UC. This paper presents a study on isolated hybrid distributed generation (DG) system for improving the frequency deviation profile. The hybrid DG system consists of wind turbine generator (WTG), diesel engine generator (DEG), aqua-electrolyzer (AE), fuel cell (FC) along with energy storage units. The frequency control problem is addressed for DG system connected with superconducting magnetic energy storage (SMES) or ultra-capacitor (UC). The particle swarm optimization (PSO) based loop shaping of H-infinity controller is used and compared with those obtained by genetic algorithm (GA) to minimize the frequency deviation. The frequency stabilizing performance is analyzed under different disturbances. Also, the controller robustness in terms of system parameter uncertainties is tested for changes in parameter up to ±30% from its nominal value. The results demonstrate minimum frequency deviation as achieved by proposed controller with use of UC in hybrid DG system.