High-power-level energy storage type hydraulic wind turbine generator frequency modulation control system and method

Abstract

The invention provides a high-power level energy storage type hydraulic wind turbine generator frequency modulation control system and method, the system comprises a wind wheel module, a hydraulic main transmission system module, a plurality of power generation subsystem modules and a power grid monitoring module, a plurality of power generation subsystems are cut in and cut out according to a planning sequence, and smooth power switching in a full power range is realized; when the frequency controller predicts that the load of the power grid changes, the active power output of the wind turbine generator needs to be adjusted; a frequency controller in the power grid monitoring module controls an EHA variable pitch system in the wind wheel module and hydraulic elements in all power generation subsystems in advance according to the unit operation state, the wind power prediction result and the monitored power grid load change so as to increase or reduce the active power output of the wind turbine unit. The wind energy captured by the wind wheel is matched with the power grid load, the frequency fluctuation of the power grid is effectively inhibited, and the defect of phase response lag of the system is overcome.

Description

technical field [0001] The present application relates to the technical field of wind power generation, in particular to a frequency modulation control system and method for a high-power energy-storage hydraulic wind turbine. Background technique [0002] In recent years, the installed capacity of renewable energy units has increased rapidly, and its grid connection method has changed from local grid connection to centralized and distributed grid connection in multiple regions. As the penetration rate of wind turbines increases, the intermittent output of wind turbines begins to affect the overall operation of the power grid. The increase in the proportion of wind turbines has led to a significant decrease in the inertial response capability of the power system, and the impact of system inertia reduction on frequency security has gradually become prominent. Therefore, how to ensure the system frequency quality in a power system with a high proportion of wind power is one of...

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Problems solved by technology

However, this method is suitable for wind turbines with a single pump-single motor as the main transmission system.

[0006] The existing hydraulic wind turbine frequency modulation control method cannot well adapt to the development trend of large-scale wind turbines. Therefore, it is necessary to provide a new type of high-power energy storage hydraulic wind turbine frequency modulation control system and method.

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