Abstract
Unified Power Quality Compensator (UPQC) is used to protect the sensitive loads in the distribution system from voltage and current disturbances. The compensation capability of UPQC depends on the control strategies used for shunt and series converters. Conventional adaptive hysteresis controller pulse width modulation technique had failed to track exactly during transient conditions and disturbances at load and source side. In paper fuzzy adaptive hysteresis controller is proposed for three phase four wire UPQC for compensating voltage sag/swell, current harmonics, voltage harmonics and neutral current compensation. Fuzzy adaptive hysteresis controller can effectively compensate the power quality problems during the transient conditions. A comparative simulation analysis of proposed and conventional methods are presented in this paper using MATLAB/SIMULINK tool.
Highlights
Control Algorithm For Shunt ConverterFor shunt active power filter load current, source voltage and DC –link voltages are taken as feedback signals
Unified Power Quality Compensator (UPQC) is used to protect the sensitive loads in the distribution system from voltage and current disturbances
In this work compensation of voltage sag/swell, voltage harmonics, current harmonics and neutral current compensation is done based on fuzzy hysteresis controller
Summary
For shunt active power filter load current, source voltage and DC –link voltages are taken as feedback signals. A small amount of active power is drawn by shunt APF to maintain the DC bus voltage and the losses(iloss). The difference between reference DC voltage and sensed (Vdc) DC voltage is the error signal. The error signal is given as an input for PI controller and the output of PI controller is considered as the current (iloss) signal. The summation of fundamental DC-current component and current(iloss) gives the reference direct axis supply current. The neutral current in the fourth wire is sensed and compared with reference value, which is set to zero. The error signal generated, is given as an input to hysteresis current controller to generate the triggering pulse for the two switches in the fourth leg of shunt APF
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