Frequency regulation control method of energy storage hydraulic wind turbine based on load forecasting

Abstract

The invention discloses a frequency modulation control method of an energy storage hydraulic type wind power generating set based on load prediction. The control system includes a wind wheel module, a hydraulic main transmission system module, a hydraulic energy storage system module, a generator grid connection module and a prediction module . According to the detected grid data, the future load situation is predicted. When the load fluctuation is predicted, the pitch angle of the wind turbine module, the variable motor swing angle of the hydraulic main drive system module, and the variable pump / motor swing angle of the hydraulic energy storage system module are controlled. Control the active power output by the system and respond to load fluctuations in advance to stabilize the frequency of the generator. The principle of coordinating active power is to start regulation when the predicted result is about to fluctuate to compensate for the response hysteresis of the components. Among them, variable pump / motor swing angle control is given priority, and then the power input to the generator is adjusted by adjusting the variable motor swing angle. At the same time, the pitch angle of the wind turbine module is controlled to change the input wind power, thereby stabilizing the frequency of the system.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a frequency modulation control method for an energy storage hydraulic type wind power generating set based on load forecasting. Background technique [0002] With the increasing environmental and energy problems, wind power technology has attracted more and more attention at home and abroad, and the installed capacity of wind power in my country has also increased day by day. [0003] As a new type of wind power generation device, the hydraulic wind turbine is different from the traditional gear wind turbine. It adopts a closed-type hydraulic transmission system of quantitative pump-variable motor, which effectively cooperates with the excitation synchronous generator. The unit effectively reduces the The weight of the nacelle reduces the impact on the grid and improves the quality of power generation. [0004] With the increasing penetration of wind po...

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Problems solved by technology

As for the research on the frequency modulation control method, the research on the frequency modulation control method of the hydraulic wind turbine is still less, and the frequency modulation control method of the traditional wind turbine mostly relies on the power electronic equipment, that is, the converter and the large moment of inertia equipment. On the one hand, it increases the The cost and weight of wind turbines, on the other hand, once there is a problem with the power electronic equipment, the frequency can no longer be adjusted

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