Optimal Voltage Control Scheme on an Observer- Based For Three-Phase Ups Systems by Using Fuzzy

A simple optimum voltage control method is proposed in this paper for three phase uninterruptible power supply systems based on fuzzy control. Moreover, the optimal load current observer is employed to optimize system cost and reliability. The previous term is designed to make the system errors converge to zero, whereas the latter term is applied to compensate for the system uncertainties then the closed loop stability of an observer based optimal voltage control law is mathematically proven by showing that the whole states of the increased observer based system errors exponentially converge to zero. Specially, fuzzy control techniques are terribly interesting for a wide range of applicable fields allowing regulation of voltage profiles handling uncertainty and inexact information. The designing of the proposed controller is validated through simulations on MATLAB/Simulink and experiments on a prototype 600-VA test bed with a TMS320LF28335 DSP. Here fuzzy management is used compared to other controllers. Finally, the comparative results for the proposed scheme and therefore the conventional feedback linearization control theme are given to demonstrate that the proposed algorithm achieves an excellent performance like fast transient response, small steady state error, and low total harmonic distortion under load step change, unbalanced load and nonlinear load with the parameter variations.