Research Of Microgrid Inverter Control Strategy

In this paper, the control strategy of microgrid inverter is the target.The traditional parallel operation control strategy of microgrid inverter researched firstly, through the design of controller, this article improved the voltage and current double control loop, improved power droop control. The research studied in microgrid inverter with the same capacity and the different capacity of microgrid. The new control strategy can effectively restrain circulation or the system, can distribute the system power proportionally. It obtained good control effect. The specific content is as follows:First, this paper introduces the related concepts of micro grid. The development of microgrid both at home and abroad were reviewed, including the operation and control of the microgrid, and the structure of inverter based microgrid.Second, analyze the main circuit structure and control method of single inverter,and determine the main parameters of the circuit,to lay the foundation for further study micro-grid inverters operating in parallel interface technology.Third, summarize the common Microgrid grid connected inverter parallel operation control strategy,and focuses on the droop control strategy.Fourth, based on the traditional droop control strategy, proposed a control method based on virtual impedance. The improvement are the voltage and current control loop, power control loop and the response changed the droop control algorithm.Fifth, microgrid inverter parallel operation module,improved control algorithm and control strategy,build the simulation model on the platform of MATLAB/simulink. The platform was used to simulate the new control strategy. Through the simulation waveform to verify the effectiveness of the improved control strategy.