Variable speed constant frequency wind power generation system integrated with energy storing device and control methods

Abstract

The invention discloses a variable speed constant frequency wind power generation system integrated with an energy storing device and control methods. A variable pitch draught fan is connected with a variable pump through a coupler, the variable pump, a one-way valve A, a two-position two-way electromagnetic directional valve B, a variable motor and an oil filter are sequentially connected through hydraulic pipelines to form a loop-locked main hydraulic speed regulation loop, the variable motor is connected with a power generator or an electromotor through a clutch A, the energy storing device comprises a pump or a motor and a high-pressure gas storage tank, and the power generator or the electromotor is connected with the pump or the motor through a clutch B. A wind generating set and the energy storing device are integrated, the displacement of the variable pump and the displacement of the variable motor are independently regulated, maximum power tracing of a wind turbine can be achieved, it can be guaranteed that the output rotating speed of the variable motor is constant, the output frequency of the power generator is stable, different control methods are adopted for different types of wind power, the influences of the time and climate change on wind power generation are effectively avoided, the wind energy utilization rate is greatly increased, and wind electricity quality is improved.

Description

technical field [0001] The invention relates to a wind power generation system, specifically a variable-speed constant-frequency wind power generation system integrating an energy storage device, and belongs to the technical field of renewable energy power generation and energy storage. Background technique [0002] Existing variable-speed constant-frequency wind power generation systems generally use gear box speed-up asynchronous generators or direct-drive permanent magnet synchronous generators, both of which realize variable-speed constant-frequency wind power generation through power electronic converter equipment. With the continuous increase of the power of single-machine wind turbines, these two modes of variable-speed constant-frequency wind power generation greatly increase the weight of the nacelle and the cost of power generation, which seriously restricts the reliability of the unit. It is difficult for wind turbines to guarantee continuous, stable and reliable ...

AI Technical Summary

Problems solved by technology

With the continuous increase of the power of single-machine wind turbines, these two modes of variable-speed constant-frequency wind power generation greatly increase the weight of the nacelle and the cost of power generation, which seriously restricts the reliability of the unit. It is difficult for wind turbines to guarantee continuous, stable and reliable power generation

[0003] Chinese Patent Publication No. 201110323608, titled "High Power Hydraulic Wind Power Generator", discloses a wind power generator consisting of a propeller, a coupling, a hydraulic pump, a hydraulic pipeline, a bypass, an overflow valve, and an outer planetary gear cycloid hydraulic motor. Composed of generator sets, etc., the power generation device uses hydraulic technology to achieve variable speed and constant frequency power generation, but does not consider the maximum wind power, energy storage technology and specific variable speed constant frequency control methods

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