The Micro Power Control Tactics Research And Itscontrol System Design Based On Microgrid

Cause the way of transmission and distribution in traditional power grid exist manydeficiencies，it also promotes the development of distributed generation technologies. Butnow existing operating mode can not meet the application requirements anymore. Therefore,on the basis of distributed generation technologies, melt the micro-power and load as a "Overall ". The " Overall " is just a micro-grid which can run with distribution grid and canalso be run single. No matter what state the micro-grid is,that it need to ensure the stability ofits power quality. And for this purpose can be adjusted to achieve micro-power.Mostmicro-power accesse microgrid by inverter,therefore, so the control object could transform oninverter.v/f control is a constant voltage and constant frequency control,no matter how changes inthe power output of the micro-power,the output voltage amplitude and frequency keep in theacceptable range, have great help for the stable of power quality,suitable for micro-gridislanding operation. v/f control contain the droop characteristics,just like the conventionalgenerator, for the wireless parallel control between the micro-power. Article used P-f、Q-Udroop characteristics for design control systems. The whole control system contain PQmeasurement and calculation、P-f、Q-U droop control、voltage and current double closed-loopcontrol. In the double closed-loop design, articles select the current of filter capacitor,as thecontrol variables of current loop, so current loop could suppression the disturbance of loadcurrent in time. The v/f control system designed in articles,could reasonable allocation powerin microgrid for each micro-power, thus avoiding some micro-power overload.PQ control is the constant power control, suitable for running with grid. The PQ controlsystem designed in articles, controlling the inverter output active current and reactive current,aim to control the output power. The control system according to the reference value couldoutput constant active power and reactive power,when system power changes.based on the mathematical model in the twe-phase rotating coordinate system andcombined some decoupling means, design for the v/f control system and the PQ controlsystem. In the control system design typical uses of the design process will be simplified.Forv/f control system. According to frequency response curve of their equivalent outputimpedance. The parameters of voltage loop and current loop were optimized.Build on the simulation model for the controller is designed in Matlab/Simulink. Test and verify the effectiveness of v/f control system under islanding operation mode and PQ controlsystem running with grid in a single micro-power simulation experiment. Experimental resultsshow that the v/f control system designed in articles,could hold voltage and frequency ofload,and could reasonable allocation power in microgrid for each micro-power under thesituation of micro-power parallel operation.If the reference value unchanged the PQ controlsystem could constant its output power even the system power changed,the changed power allborne by the distribution network.The article used the resources，created a simple distributed generation systems. Andcombining the local situation, to explore the economics of distributed generation andenvironmental protection.