A Reference Compensation Current Control of Grid-Connected Inverter for Three-Phase Distributed Generators

Abstract:

Renewable energy resources (RES) are being increasingly connected in distribution systems by utilizing power electronic converters. However, the extensive use of power electronics has resulted in a rise in power quality (PQ) concerns faced by the utility. A novel control strategy implementing reference compensation current was proposed in this paper. So that these grid-connected inverters can achieve maximum benefits when they installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to transfer active power from RES to the grid, and 2) load reactive power demand support; 3) current harmonics compensation at PCC; and 4) current unbalance and neutral current compensation in case of 3-phase 4-wire system. Moreover, with adequate control of grid-interfacing inverter, all the four objectives can be accomplished either individually or simultaneously. Simulation results show the validity and capability of the novel proposed control strategy.

• Periodical: Applied Mechanics and Materials (Volumes 433-435)
• Pages: 1183-1187
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.433-435.1183
• Online since: October 2013
• Authors: Shao Ru Zhang, Shao Yuan Li
• Keywords: Active Power Filter (APF), Distributed Generator (DG), Grid-Connected Inverter, Power Quality (PQ), Reference Compensation Current, Renewable Energy Resources (RES)

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