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Abstract
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Recently, reduced switch count converter switch numerous advantages such as low cost and weight, small size and high reliability have been introduced to be used in unified power quality conditioner (UPQC). In this paper a novel topologyfor UPQC based on back-to-backB4 converter and its control system are proposed. The conventional UPQC consists of twelve switches while the proposed topology for UPQC has 8 switches. By reducing the number of switches, the price of the whole system and losses are decreased. In addition, the proposed control system can be used in conventional UPQC when one of converter legs has a faulty condition. This increases reliability of the system. Special control and modulation schemes have been offered to compensate oscillations in load and utility currents and voltages and also input power factor of UPQC. The experimental and simulation results verify the efficiency of proposed control and modulation schemes of proposed topology.
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