Research Of Micro-grid Operation Control Based On Droop Control

From the human development history,energy is always the ladder of human development,from the early wood type of bio and fuel to coal,oil and other fossil resources later,energy and our life can be said that the progress of,human science and technology cannot do without energy.Based on the droop control of micro-grid has many advantages in islanding and grid,it can be very good for the effective regulation of frequency and voltage of micro power output,the micro-grid has better stability,safety,reliability,and does not require additional means of communication.Based on the traditional droop control method,this paper analyzes the current voltage loop by establishing the mathematical model in dq,and then points out that the traditional droop control is influenced by the line impedance.In order to improve the adaptability of the micro-power inverter to the line,The virtual impedance is added to the traditional droop control,which verifies that the virtual impedance can improve the power distribution and the frequency is stable.However,due to the introduction of the virtual impedance,the voltage of the micro-grid will be reduced.In order to compensate for the voltage drop caused by the introduction of the virtual impedance,The voltage drop principle of the power system is introduced,and the voltage compensation link is introduced to verify that the voltage of the micro-grid system can be improved in the micro-grid based on the droop control.Then,the droop control island model with virtual impedance and voltage compensation is built in MATLAB,and the voltage and current power distribution of island are verified.Then based on the DSP2812,on the droop control inverter device carried out the main part of the hardware and process design.