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Abstract
This paper proposes the instantaneous p-q theory based fuzzy logic controller (FLC) for multi converter unified power quality conditioner (MC-UPQC) to mitigate power quality issues in two feeders three-phase four-wire distribution systems. The proposed system is extended system of the existing one feeder three-phase four-wire distribution system, which is operated with UPQC. This system is employed with three voltage source converters, which are connected commonly to two feeder distribution systems. The performance of this proposed system used to compensate voltage sag, neutral current mitigation and compensation of voltage and current harmonics under linear and nonlinear load conditions. The neutral current flowing in series transformers is zero in the implementation of the proposed system. The simulation performance analysis is carried out using MATLAB.
Highlights
Modern days power systems are complicated networks with hundreds of generating stations and load centers being interconnected through power transmission lines
The reference source current generation is extracted by the per phase fundamental active power estimation which is added to fuzzy logic controller (FLC) output, the threephase source currents were compared to the reference currents through which generates the appropriate shunt gate signals to be given for shunt VSI: Plabc = Vlabcα−β + Ilabcα−β
In order to justify the strategies of new control scheme discussed above, a Matlab based simulation designed as the system described in Fig. 2, and the results are compared with a conventional system
Summary
Modern days power systems are complicated networks with hundreds of generating stations and load centers being interconnected through power transmission lines. A new structure of three-phase four-wire (3P4W) distribution system utilizing UPQC to balance the unbalanced load currents, neutral current compensation using PI control technique is reported in [1]. When the system is connected to 3P4W, the improvement of power quality issues like voltage, current unbalance, distortions, reactive power demanded by the load using UPQC is reported in [5], [6], [7], [8], [9], [10]. A new control strategy of 3P4W UPQC for power quality improvement is reported in [14], [15], [16], [17], to the control of shunt APF with a simple scheme based on the real component of fundamental load current (I cos Φ) to reduce the number of current sensors is applied. The system consists of two-series converters and one shunt back to back converter with common DC-link capacitor in order to maintain the voltage
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