| Wind energy is the inexhaustible and most commercialized new energy in nature.It has been favored by global energy research institutions.In view of the current conventional wind turbines,the hydraulic energy storage type wind turbines are equipped with only hydraulic pumps and accessories in the engine room.The internal weight of the engine room will be greatly reduced and the hoisting is very favorable.The hydraulic motors and generators are placed on the ground,and the operation and maintenance are more convenient.The generating units are driven directly by the hydraulic motor to generate electricity by synchronous generators,and the gear boxes and rectifier inverters of the traditional wind turbines are omitted.The hydraulic accumulator is used as the energy storage device to realize continuous power generation under the condition of unstable wind or short wind,and improve the utilization ratio of wind energy.In this paper,the operation characteristics of hydraulic energy storage wind turbines are studied.First,the working principle of the hydraulic type wind turbine without the energy storage device is introduced.After that the energy storage device is used to analyze the different positions of the unit,and the appropriate configuration method of the energy storage device is selected,and put forward the operation interval of hydraulic energy storage wind turbine.Taking the hydraulic accumulator type wind turbine as the research object,the mathematical model of each part of the unit is established.The components of hydraulic accumulator type wind turbine are calculated and selected.The control strategy of the whole unit after adding energy storage device is analyzed,and the simulation model of the unit is built by AMESim software.Finally,the research project of this subject is introduced: the 600 k W hydraulic energy storage wind power test prototype proves the feasibility of the hydraulic transmission wind power generation system.This paper analyzes the influence of energy storage pressure on the operation characteristics of the unit.In the AMESim software,the running state of the hydraulic wind turbine is simulated first,and the correctness of the simulation model is verified.Then the energy storage device with different pressure is cut into,and the pressure of the main transmission hydraulic system,the running characteristic of the wind wheel,the running characteristic of the generator and the running characteristics of the energy storage device are simulated.Based on the simulationresults,the influence of energy storage pressure on the operation characteristics of hydraulic wind turbines is summarized.When the wind is large and power demand hours,the unit should cut into the smaller pressure storage device,which can meet the demand for electricity,and can convert the excess wind energy into hydraulic energy storage.When the wind is small and the power demand is large,the unit should cut into the pressure storage device to improve the power of the unit to meet the requirements.Under no wind or extreme wind speed,the large pressure accumulator can be directly used as a single power source to realize the continuous generation of the unit in a certain time and transport the power to the power grid.The results of this paper not only provide theoretical support for the promotion of the unit,but also provide a reference for the other applications of the large volume accumulator in the volume speed control loop. |
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