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In this paper, an improved power quality 18-pulse voltage source converter is proposed for back-to-back (BTB) high voltage direct current (HVDC) system. The proposed system is regulated using PI controller for which controller gains are selected using Ziegler Nichols approach for different transient conditions. The calculated controller gains are utilized with current regulated approach with reduced...
Power quality is one of the imperative issues in electrical distribution side. The use of UPQC (Unified Power Quality Conditioner) is widely accepted and implemented as a solution to the power quality problems in utility, industry and commercial applications. This paper presents the comparison of two different configuration of UPQC — the conventional and the transformer less UPQCs. A SRF (Synchronous...
This paper presents a control system based on a repetitive controller to compensate key power-quality disturbances, namely voltage sags, harmonic voltages and voltage imbalances, using a dynamic voltage restorer (DVR). The control scheme deals with all three disturbances simultaneously within a specified bandwidth. The control structure contains a feed-forward term to improve the transient response...
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