Linear quadratic regulator controllers for regulation of the dc-bus voltage in a hybrid energy system: Modeling, design and experimental validation. (March 2022)

• Record Type: Journal Article
• Authors: Abdullah, Majid A.; Al-Shetwi, Ali Q.; Mansor, M.; Hannan, M.A.; Tan, Chee Wei; Yatim, A.H.M.
• Is Part Of: Sustainable energy technologies and assessments. Volume 50(2022)
• Publication Date: 2022-03
• Subjects: WECS Wind Energy Conversion System -- LQR Linear Quadratic Regulator -- MPPs Maximum Power Points -- MPPT Maximum Power Point Tracking -- OPP One-Power-Point -- PI Proportional Integral -- P&O Perturbation and Observation; Linear quadratic regulator (LQR) -- Wind energy conversion system (WECS) -- Ultracapacitor -- Energy storage system -- Bidirectional converter -- Boost converter; Renewable energy sources -- Periodicals; Energy development -- Technological innovations -- Periodicals; Electric power production -- Periodicals; Energy storage -- Periodicals; 333.79
• DOI: 10.1016/j.seta.2021.101880
• Languages: English
• ISSNs: 2213-1388

Abstract

Highlights: LQR based controllers for interfacing a hybrid wind and ultracapacitor energy system to a common dc-bus. Implementation of LQR controllers on a TMS320F2812 eZdsp board. Regulating the dc-bus voltage to a desired level while extracting the maximum power from available wind. Control of hybrid wind/ultracapacitor energy system. Abstract: In this paper, linear quadratic regulator (LQR) controllers for effective operation of a hybrid energy system consisting of ultracapacitor energy storage and wind energy system have been designed and implemented. The control objective is to regulate the dc-bus voltage to a target level while extracting the maximum power from the available wind. The dc-bus voltage regulation is achieved by controlling the charging and discharging of the ultracapacitor through a bidirectional converter, and tracking the maximum power points (MPPs) is achieved by controlling a boost converter interfacing the wind turbine with the dc-bus. In addition, a boost converter-based wind turbine emulator to behavior similar to a real wind generator has been developed for testing the proposed controllers. The performance of the proposed energy system incorporating the LQR controllers has been tested under several scenarios (both in simulations and experiments), and the results presented. The simulation tests were conducted in the environment of MATLAB/Simulink, and the experimental tests implemented based on low-cost Digital Signal Processor (DSP) TMS320F2812 eZdsp board. The simulation and experimental results demonstrate their consistency and the capability of the proposed LQR controllers to (1) track the reference voltages and currents, and (2) swiftly recover the nominal operating condition of the system at all conditions including any variation in wind speed or load demand.