SyRG-PV-BES-Based Standalone Microgrid Using Approximate Multipliers Based Adaptive Control Algorithm

This article deals with the adaptive control algorithm to maximize the distributed generations (DGs) in islanded microgrid. The approximate multiplier least mean square (AMLMS) control scheme is used for the extraction of fundamental load component with reduced steady state error and faster convergence to provide better performance than conventional LMS control. This control focuses on reduction of complexity of LMS by adding multipliers in the finite impulse response filter and updating the coefficients. The AMLMS control algorithm for a voltage source converter is also effective in compensating harmonics for power quality improvement of islanded microgrid system while feeding nonlinear load. In an islanded microgrid at ac side, a synchronous reluctance generator based pico-hydropower generator is used because it is economical than other conventional generators. At dc side, a photovoltaic array and a bidirectional dc–dc converter (BDC) are used. The BDC with a storage battery maintains the optimal power flow to provide the power equilibrium between load and sources through dc-link voltage regulation. The BDC also mitigates the second order harmonic from the battery charging and discharging current. Test and simulation results validate the effectiveness of AMLMS control under steady and dynamic conditions of solar insolation change and load unbalance.