Control strategy of microgrid inverter operation in Grid-connected and Grid-disconnected modes

Microgrid is a independent and controllable system which is composed by load and miniature power. It provides for the local power and energy. The complex control of microgrid is implemented by microgrid inverter. This paper introduces two operation modes of Grid-connected and Grid-disconnected for microgrid inverter. On the Grid-connected operation, it uses hysteresis current tracking, by adjusting the output current to the grid to achieve energy transmission. On the Grid-disconnected operation, it uses voltage close loop control, by adjusting the output voltage to ensure stable load voltage. When the gird fails or recovers, microgrid inverter can switch smoothly between two modes of Grid-connected and Grid-disconnected operations. The simulation results show the feasibility and effectiveness of control strategy.

[1]  T. Green,et al.  FAULT BEHAVIOUR IN ISLANDED MICROGRIDS , 2007 .

[2]  H. Nikkhajoei,et al.  Microgrid Protection , 2007, 2007 IEEE Power Engineering Society General Meeting.

[3]  B. Hadzi-Kostova,et al.  New protection concepts for distribution systems with dispersed generation , 2005, 2005 IEEE Russia Power Tech.

[4]  M. A. Redfern,et al.  A New Voltage based Relay Scheme to Protect Micro-Grids dominated by Embedded Generation using Solid State Converters. , 2007 .

[5]  M.A. Redfern,et al.  A voltage based protection for micro-grids containing power electronic converters , 2006, 2006 IEEE Power Engineering Society General Meeting.

[6]  IEEE Power Engineering Society General Meeting , 2007, 2007 IEEE Power Engineering Society General Meeting.

[7]  Sang-Hee Kang,et al.  AGENT-BASED ADAPTIVE PROTECTION COORDINATION IN POWER DISTRIBUTION SYSTEMS , 2003 .

[8]  Li Ping.  Hysteresis Current Control Strategy for Three-phase Three-wire Active Power Filter , 2007 .

[9]  N. Hatziargyriou,et al.  Operation of a prototype microgrid system based on micro-sources quipped with fast-acting power electronics interfaces , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[10]  Michael Angelo A. Pedrasa,et al.  A Survey of Techniques Used to Control Microgrid Generation and Storage during Island Operation , 2006 .

[11]  R.H. Lasseter,et al.  Microgrid: a conceptual solution , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).