A Novel Control Algorithm of a Three-phase Four-wire PV Inverter with Imbalance Load Compensation Function

  • Le, Dinh-Vuong ;
  • Kim, Chang-Soon ;
  • Go, Byeong-Soo ;
  • Park, Minwon ;
  • Yu, In-Keun
  • Received : 2017.09.17
  • Accepted : 2018.02.07
  • Published : 2018.05.01


In this paper, the authors suggest a new control algorithm for a three-phase four-wire photovoltaic (PV) inverter with imbalance load compensation function using conventional proportional-integral (PI) controllers. The maximum power of PV panel is calculated by the MPPT control loop. The reference varying signals of current controllers are transformed to two different rotating frames where they become constant signals. Then simple PI controllers are applied to achieve zero steady-state error of the controllers. The proposed control algorithm are modeled and simulated with imbalance load configuration to verify its performance. The simulation results show that the maximum PV power is transferred to the grid and the imbalance power is compensated successfully by the proposed control algorithm. The inverter has a fast response (~4 cycles) during the transient period. The proposed control algorithm can be effectively utilized to the three-phase four-wire inverter with imbalance load compensation function.


Imbalance load;Control algorithm;PI controller;Three-phase four-wire inverter


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Supported by : Korea Electric Power Corporation