Control of a microgrid with unbalanced loads using virtual negative-sequence impedance loop

Hamzeh, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/PEDSTC.2014.6799348
  3. Abstract:
  4. This paper presents an effective control strategy for autonomous operation of a multi-bus medium voltage (MV) microgrid (MG) consisting of several dispatchable distributed generation (DG) units. Each electronically-coupled DG unit supplies the loads which can be unbalanced due to the inclusion of single-phase loads. The proportional resonance (PR) and droop controllers are, respectively, used to regulate the load voltage and share the average powers among the DG units. The virtual negative-sequence impedance controller (VNSIC) is proposed to effectively compensate the negative-sequence currents of the unbalanced loads. Moreover, the VNSIC minimizes the negative-sequence currents in the MV lines and thus, improving the power quality of the MG. The performance of the proposed control strategy is verified by using digital time-domain simulation studies in the PSCAD/EMTDC software environment
  5. Keywords:
  6. Distributed generation ; MV microgrid ; Distributed power generation ; Power electronics ; Time domain analysis ; Voltage control ; Digital time-domain simulations ; Distributed generation units ; Medium voltage microgrid ; Micro grid ; Negative-sequence currents ; Power sharing ; Software environments ; Unbalance load ; Controllers
  7. Source: PEDSTC 2014 - 5th Annual International Power Electronics, Drive Systems and Technologies Conference ; 2014 , p. 78-83
  8. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6799348&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6799348