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1887

access icon free Isolated H-bridge DC–DC converter integrated transformerless DVR for power quality improvement

© The Institution of Engineering and Technology
Received 25/06/2019, Accepted 02/12/2019, Revised 08/10/2019, Published 04/12/2019

This study presents a new H-bridge DC-DC converter-based transformerless dynamic voltage restorer topology (DVR). The proposed system can compensate balanced and unbalanced voltage sag/swell that are the most common electrical power quality problems and offers advantages over conventional DVR topologies by providing the isolation with high-frequency transformer (HFT) rather than bulky injection transformers and by employing shunt converter to eliminate the requirement of an energy storage unit. The system is composed of H-bridge DC–DC converter equipped with a HFT with one primary and three secondary windings and transformerless DVR. The single-phase shift modulation method is used for each series converter independently to provide the bidirectional power flow control of DC–DC converter, whereas in-phase compensation method with a hybrid detection algorithm is used to mitigate voltage sag/swell. An LC filter is employed to attenuate the switching ripple harmonics on the output of the DVR. The performance of the proposed system is verified experimentally on a three-phase, three-wire, 380 V, 10 kVA prototype.

Inspec keywords: energy storage; inductors; power supply quality; DC-DC power convertors; load flow control; voltage control; high-frequency transformers

Other keywords: conventional DVR topologies; unbalanced voltage sag; voltage 380.0 V; DC–DC converter-based transformerless dynamic voltage restorer topology; apparent power 10.0 kVA; transformerless DVR; series converter; in-phase compensation method; common electrical power quality problems; half-bridge; bidirectional power flow control; bulky injection transformers; H; shunt converter; high-frequency transformer; single-phase shift modulation method; isolated H-bridge DC–DC converter; power quality improvement

Subjects: Control of electric power systems; Power system control; Power electronics, supply and supervisory circuits; Power supply quality and harmonics; DC-DC power convertors

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