{"title":"Star-Hexagon Transformer Supported UPQC","authors":"Yash Pal, A.Swarup, Bhim Singh","volume":49,"journal":"International Journal of Electrical and Computer Engineering","pagesStart":14,"pagesEnd":20,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/13464","abstract":"A new topology of unified power quality conditioner\n(UPQC) is proposed for different power quality (PQ) improvement in\na three-phase four-wire (3P-4W) distribution system. For neutral\ncurrent mitigation, a star-hexagon transformer is connected in shunt\nnear the load along with three-leg voltage source inverters (VSIs)\nbased UPQC. For the mitigation of source neutral current, the uses of\npassive elements are advantageous over the active compensation due\nto ruggedness and less complexity of control. In addition to this, by\nconnecting a star-hexagon transformer for neutral current mitigation\nthe over all rating of the UPQC is reduced. The performance of the\nproposed topology of 3P-4W UPQC is evaluated for power-factor\ncorrection, load balancing, neutral current mitigation and mitigation\nof voltage and currents harmonics. A simple control algorithm based\non Unit Vector Template (UVT) technique is used as a control\nstrategy of UPQC for mitigation of different PQ problems. In this\ncontrol scheme, the current\/voltage control is applied over the\nfundamental supply currents\/voltages instead of fast changing APFs\ncurrents\/voltages, thereby reducing the computational delay.\nMoreover, no extra control is required for neutral source current\ncompensation; hence the numbers of current sensors are reduced. The\nperformance of the proposed topology of UPQC is analyzed through\nsimulations results using MATLAB software with its Simulink and\nPower System Block set toolboxes.","references":"[1] E. W. Gunther and H. Mehta, \"A survey of distribution system power\nquality\", IEEE Trans. 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