Wind-Hydro microgrid and its control for rural energy system

Abstract

This work is associated with the renewable energy based microgrid for a standalone operation. The places where the renewable energy sources such as wind, solar, hydro etc. are in abundance can be used to generate electricity by developing microgrid (MG) such as wind- hydro MG. A synchronous reluctance generator (SyRG) is used as a constant speed hydro turbine and a permanent magnet brushless DC generator (PMBLDC) as a variable speed wind turbine. The wind power is converted into electricity and converted into DC power using three phase diode bridge with a boost converter, a maximum power point tracking (MPPT) based perturb and observe (P&O) technique is applied. This power is fed to a battery bank and the consumer loads. The battery bank is attached at DC bus of VSI (Voltage Source Inverter). The SyRG is directly feeding to the AC loads and VSI is connected at the PCC (Point Of Common Coupling). This VSI is also used for the power quality improvements through harmonic suppression of nonlinear loads, voltage regulation during contingencies like load unbalance, reactive power compensation according to the system requirement etc. at PCC. It is capable of providing power balance with various changes. For the appropriate functioning of VSI, a reweighted zero attractor least mean square (RZALMS) control algorithm is applied to generate PWM switching pulses. A MG model is developed in MATLAB/ Simulink environment to simulate the MG performance in normal and dynamic conditions at linear and nonlinear loads.