Research On Grid-connecting Control Of Doubly-fed Wind Power Unit Based On Energy Storage With Super Capacitors

For the wind is intermittent energy, the wind generator rotor torque is extremely unstable.And induction generator into grid is not strictly for frequency, phase angle requirement, therefore this article's wind power generation system adopts the induction generator. Running induction generator need absorb a great deal of reactive power compensation, presently the many methods to compensating reactive power, but adjust active power equipment and methods do not development mature.This paper establishes doubly-fed induction wind power systems, rotor side converter device adopts hysteresis control method, using the rotor side converter current reference method to control the grid side converter. After PSCAD modeling simulation, gives active power waveforms. It proves that the wind power generation system can realize maximum wind power tracking. This ariticle researched that when active power is insufficient, adjusting active power and the grid side voltage method. This paper applies energy storage device to doubly-fed induction wind power systems, design energy storage inductor, filter capacitance, calculates options of power devices capacity, and puts forward energy storage device drive control method. The main purpose of parallel compensation is to smooth active power output, series compensation's main function is to ameliorate voltage waveform.