Decentralized control of parallel connection of two distributed generation units

Bahrani, B ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/IECON.2009.5414948
  3. Abstract:
  4. This paper presents a decentralized control strategy for the autonomous (islanded) operation of parallel connection of two distributed generation (DG) units. The DG units are electronically interfaced to the host grid at the same point of common coupling (PCC), where the local load is also supplied. In the grid-connected mode, the voltage-sourced converter (VSC) of each DG unit controls the exchange of real and reactive power components with the host grid, based on the conventional dq-current control strategy. In the islanded mode, one of the DG units provides voltage and frequency control for the island, and the other DG unit continues to operate with the pre-islanding dq-current control strategy. The performance of the proposed decentralized controller is validated based on a laboratory scale experimental setup. The experimental results show that the proposed decentralized controller provides robust voltage control for the islanded two-parallel DG system and can sustain the stability of the system against the load perturbations and the external disturbances. ©2009 IEEE
  5. Keywords:
  6. Current control strategy ; Decentralized controller ; DG system ; DG unit ; Distributed generation units ; Experimental setup ; External disturbances ; Grid-connected modes ; Islanded mode ; Islanding ; Laboratory scale ; Load perturbations ; Local loads ; Parallel connections ; Point of common coupling ; Real and reactive power ; Voltage and frequency control ; Voltage sourced converters ; Control system stability ; Controllers ; Electric connectors ; Electric current control ; Electric fault currents ; Electric potential ; Galerkin methods ; Industrial electronics ; Power converters ; Voltage regulators ; Decentralized control
  7. Source: 35th Annual Conference of the IEEE Industrial Electronics Society, IECON 2009, Porto, 3 November 2009 through 5 November 2009 ; 2009 , Pages 358-362
  8. URL: http://ieeexplore.ieee.org/document/5414948