Research For Active Power Coordination And Control Of Doubly-Fed Induction Generator And Battery Energy Storage System

With the increasing development of conventional energy desire of coal and oil,renewable energy technology is developing fast. As the most possible one, there is alarge demand for wind power. Wind power is determined to wind, which is random,fluctuated and hard to control, so the active power output of a wind farm fluctuatelargely. As the wind power capacity is increasing rapidly in power system, large-scalewind power integration makes it worse for power quality and operation security ofpower system. It is vital to find a reasonable active power control system of a wind farm,handling active power coordination and control of wind turbines and ESS. In thissituation, it can develop the potential of wind farm active power regulation, make poweroutput steady, and decrease the adverse effects of wind farm power fluctuation.With the development of wind turbine, the technology of variable speed andconstant frequecy is more and more important. In VSWT, DFIG is more popular thanPMSG due to its smaller inverter, lighter weight and lower cost. It is useful to study theproblem that how to make control instruction to each DFIG turbine and ESS for a windfarm to control its power output in the situation of large-scale wind power integrating topower system.This paper concludes the current research of wind farm active power output, andmakes a method of using rotational kinetic energy of DFIG turbines to steady poweroutput of the wind farm, considering the DFIG turbine’s characteristics of variable speedand constant frequecy. This paper makes groups for wind turbines of a wind farmaccording to their operation status, and gives the same control instructions for windturbines in one group. This paper proposes a control method of making the sum of windturbines’ rotational kinetic energy maximum, and solving this optimization problem bywind farm control system to optimize active power output of the wind farm. Using PSOto solve this optimization problem in real time to follow wind speed variation.According to the advantages and disadvantages of BESS, this paper proposes a methodto coordinate and control rotational kinetic energy and BESS to develop theirsuperiority both and make wind farm active power output steady. UsingMATLAB/Simulink to simulation, establishes a model for active power control anddistribution of a wind farm consists of DFIG turbines. The simulation result shows thatthe optimal method of wind farm active power output control and distribution improves wind farm’s active power output stability and has worth of engineering application.