Load prediction-based frequency modulation control method for energy storage type hydraulic wind generator set

Abstract

The invention discloses a load prediction-based frequency modulation control method for an energy storage type hydraulic wind generator set. A control system comprises a wind wheel module, a hydraulicmain drive system module, a hydraulic energy storage system module, a generator grid-connection module and a prediction module. Future load condition is predicted according to detected power grid data. When load fluctuation is predicted, a pitch angle of the wind wheel module, a variable motor swing angle of the hydraulic main drive system module and active power output by a variable pump / motor swing angle control system of the hydraulic energy storage system module are controlled, so that a frequency of a generator is stabilized through advanced response to the load fluctuation. A principleof coordinating the active power is starting regulation and control to compensate the response hysteresis of the element when the fluctuation is about to start according to a prediction result. The variable pump / motor swing angle is regulated and controlled preferentially, the power input into the generator is adjusted through regulation and control over the variable motor swing angle, and meanwhile, the pitch angle of the wind wheel module is controlled. The input wind power is changed, so that the frequency of the system is stabilized.

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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