Research On Control Strategy Of Micro-grid System Which Contains Kinds Of Distributed Resources

With the social development, distributed generation technologies to effectively addressthe problem of energy shortage provides direction, however, the distributed power supplydirectly connected to the grid, the grid itself will have some impact, so the concept ofmicro-grid applications for us. Micro-network is an important form of distributed powerutilization, a distributed micro-grid power supply, load, energy storage and a variety ofcontrollers combine to form a single manageable unit. For micro-mesh with distributedpower systems are analyzed in detail, in-depth research to make micro-network in thedifferent operating modes and stable operation of the control strategy is very necessary.This paper focuses on distributed power network models and micro-related controltechnology research goals, focusing on the modeling of distributed power, distributed powerinverter interface control technology and micro-grid operation mode smooth switching controlstrategy.Firstly，this paper discusses the photovoltaic cells, direct-drive wind turbine, three typicaldistributed power storage batteries mathematical model and the MATLAB/Simulink builtunder the applicable microgrid engineering model. Detailed analysis of the existingmaximum power point tracking method, and admittance incremental method and the opencircuit voltage Combination. Three distributed power simulation results show that eachmodel have good dynamic performance, and on the outside disturbances have betteradaptability.Secondly, this article from the basic structure of the inverter, analyzes PWM andSVPWM modulation, on this basis, the distributed power inverter interface control strategies:PQ control, Droop control and V/f control of the basic principles elaboration and simulationof the control strategy is effective. So the grid inverter take reasonable and effective controlmethod is the key to stable operation of micro-grid one.Then, this paper microgrid islanding mode of operation, the traditional LC filter withactive power filter (APF) with the use of the LC filter to filter on the basis of higherharmonics, APF can be more precise harmonic filter wave, improve power quality.Finally, this paper analyzes the micro-simulation network peering under control andmaster-slave control mode switching process of the dynamic performance of the controllerbased on the state to follow a smooth handover control method as a micro-mesh smoothswitching control strategy, to ensure that the operation mode switching process, the micro-network voltage, frequency oscillation decreases achieve micro-networks to island operationmodes smooth switching.