Double-feed wind power generating system with energy storage function

Abstract

The invention relates to a double-feed wind power generating system with energy storage function, comprising a double-feed type wind power generator, an alternating-current excitation power supply, a monitoring device, a grid-connection contactor and an energy storing device, wherein one end of the grid-connection contactor, a stator winding of the double-feed type wind power generator, and the alternating-current end of a stator side converter are together connected with a load, and the other end of the grid-connection contactor is connected with a power grid; the alternating-current end of the alternating-current excitation power supply is connected with the energy storing device; and the monitoring device controls the communication state of the grid-connection contactor to realize the conversion of an independent running mode or a grid-connection running mode of the system and controls the working states of a rotor side converter and the stator side converter according to the current running mode. When carrying out grid-connection running, the double-feed wind power generating system can actively participate in the running and the control of an electric system to provide active power and reactive power compensation and improve the quality of electric energy; when carrying out independent loaded running, the double-feed wind power generating system can achieve the dynamic balance of the active power and the reactive power at a generation side and an electric load side to ensure the safe, economic, efficient and high-quality running of wind power equipment and the load.

Description

technical field [0001] The invention belongs to wind power generation technology and energy storage technology, in particular to a double-fed wind power generation system with energy storage. Background technique [0002] Wind power generation is an effective way to utilize wind energy on a large scale. The operation of variable-speed constant-frequency double-fed wind turbine is mainly realized through the excitation control of the generator rotor by the AC excitation power supply, and the slip power of the generator rotor is controlled by using the excitation structure of the dual PWM voltage source converter. However, since the output power of wind turbines is mainly affected by wind speed, air pressure, temperature and other aspects, it will often fluctuate. In the process of grid-connected operation, the random fluctuation of its output power will cause problems such as frequency instability, voltage flicker, and harmonic pollution in the power system. During the indep...

AI Technical Summary

Problems solved by technology

This system can solve the problems caused by the fluctuation of the output power of the grid-connected wind power generation equipment, but it does not involve the control problem of the dynamic balance of power generation equipment and electrical equipment during the operation of the wind power generation system with load.

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