Research Of Multi-objective Control Strategy Of Energy Storage For Improving Micro-grid Power Quality

Micro-grid is proposed on the basis of distributed generation.Micro-grid is a control which include load and storage device.Micro-grid connected with smart grids by a common connection.Study on stability of the micro-grid power quality control is to make sure that micro-grid is running efficiently and power quality is stable.The difference between micro-grids and grid is micro-grid contains a large number of micro-power interface which is in the control of electronic converters.The control methods have been proposed to control power quality of micro-grid and control converter of micro-power connector.Micro-grid control voltages and currents are controlled by appropriate control methods.In this paper,micro-grid is the main research topics.Energy in the micro-grid is controlled.Energy storage technology solves the problem of instability of power quality.Energy storage technology implements ‘black-start’ 、 Power quality conditioners 、Stability of micro-grid system in micro-grid.A study on three kinds of PQ control methods show that PQ control methods separate the coupling of current and power.Factors of unstable micro-grid voltage is found by this way.Software phase-locked loop based on second-order generalized integrator method separates the positive sequence and negative sequence components to offset the unbalance of disturbance of micro-grid harmonic unbalance voltage.Calculating current reference is used to detect the amount of Compensated current.Remaining capacity of energy storage system is used to compensate power quality.A method which control power quality initiatively is developed in storage system of micro-grid.This method inhibit power imbalance by energy storage system and compensate all frequency of unbalanced voltage、power and distortion of harmonic.PVPI is used to Compensate the specified frequency of unbalanced voltage、power and distortion of harmonic.The two methods reduce the volatility of the micro-grid.