Control of Hybrid Off-Microgrid Configurations Based on Renewable and Non-renewable Energy Sources

Abstract

AbstractThis chapter examines the control and design of hybrid off-grid configurations using renewable and non-renewable energy sources (R&NR-ESs). Details relating to power quality, voltage, frequency regulation, and synchronization between off-grid configuration elements are provided. Analyzing and testing a hybrid off-grid configuration based on a solar PV array (SPA) and a variable speed doubly fed induction generator (DFIG) is done to better understand this technology. A rotor side converter (RSC) is designed with improved vector control to vary the speed of the diesel engine accordingly to load power demand, generated power from SPA, and battery charge level. To achieve maximum power point tracking (MPPT) from SPA, an improved Perturb and Observe algorithm (IP&O) is used. Improved oriented stator flux control is designed to maintain constant the PCC voltage and frequency, as well as improve the power quality (PQ) at the point of common coupling (PCC) for load-side converters (LSC). An algorithm based on a proportional–integral controller that prevents the BES from overcharging is employed. Simulations are conducted using MATLAB/Simulink to evaluate the performance of selected hybrid off-grid configurations and their control strategies.KeywordsOff-microgrid configurationRenewable and non-renewable energy sourcesVariable speed diesel generatorDFIGControl systemPower quality improvement