This paper is presented a reduced switch count -parallel and series converter is presented in Unified Power Quality Conditioner (UPQC) system. The topology of UPQC is designed with Four-switch in three phase three wire system with series and parallel injection converter connected back to back converter through DC-Link capacitor. Reduced switch count is introduced on both parallel and series converter i.e three phase series and parallel injection converter designed under three phase circuit having 4 switches for two legs of converter and third leg is replaced by capacitor elements. Reduced switch count topology is introduced in the reason for minimizing cost, maintenance, harmonics problems and so improving efficiency of system. The nature of switch replacement by capacitor is an important task to balancing of three phase of each phase voltages. So an ANFIS based synchronous reference frame controller is introduced to balancing of both reduced switch converter and also used to maintained power quality and harmonics minimization. Present controller of ANFIS is combined application of Fuzzy logic and neural network controller so this is used to extract harmonics, disturbances and controlled accurately.

This Study Proposes the novel four wire UPQC topology for Non-linear load and three-phase fault compensation. The electrical power quality is affected by many factors like harmonic pollution due to non-linear loads such as large thyristor power converters, rectifiers and the voltage/current flickering due to arc furnaces and also the sag and swell creation due to the switching of the loads. To overcome the above mentioned problems use of a combined system of shunt and active series filters like Unified Power Quality Conditioner (UPQC) topology. This device contains the integration of a shunt active filter together with a series active filter in a back to back configuration to simultaneously compensate the supply voltage and the load current. Also, it is used to mitigate any type of voltage and current fluctuations and power factor correction in a power distribution network. In this study a novel design of UPQC proposed for voltage sag compensation by using Adaptive Network based fuzzy inference system (ANFIS). This proposed controller has been provided the dynamic control of shunt and series converter operation. It has the combined operations of FL and Artificial Neural Network (ANN) relative advantages and also a powerful processing tool with both advantages can be obtained by combining them together. The simulation results have verified by using MATLAB/SIMULINK environment.

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