Research On The Inverter Operation Control Strategy For Microgrid

Along with the conventional energy shortage, environment protection and power de-mands increasing, distributed generation technology based on renewable energy is rapidly developing now. For effective integration of the distributed power, microgrid constitutes a small power system which is controllable and can run in separate/grid two modes. Micro-grid has more advantages in the access of a large number of distributed power supply, im-proving the power quality and power supply reliability. As all kinds of micro power and energy storage devices are mostly connected to microgrid through power electronics in-verter, so the research for micro power inverter control strategy to promote the micro grid and reliable stable operation is significant.This paper adopts effective approach for the operation and control strategy in micro-grid. First, on the basis of the parallel operation and islanding operation in microgrid, the common and appropriate control schemes including PQ control, V/f control and Droop control are proposed. According to the topology of microsource three-phase inverter sys-tem as well as its mathematical model, droop control system for microsource inverter is established. The control system combining fuzzy PI controller and double closed loop control scheme, greatly improves the control effect of microgrid. Secondly, for the micro-source single phase inverter control in microgrid, taking the state-space model and robust control into accont, a strategy about H∞ robust control is presented. Finally, the simulation verified effectiveness of the control scheme.