Abstract
The hydraulic wind turbine(HWT) is taken as the research object. To realize the quasi-synchronized safe connection of the HWT, the mathematical model of the fixed displacement pump - variable motor is first established, and the multiplicative nonlinearity existing in the modeling process is solved by the small signal linearization method. For the closed-loop speed regulation system of fixed displacement pump-variable motor, a variable speed input-constant speed output control method based on indirect flow feedback and direct-speed closed-loop system is proposed. Combining MATLAB/Simulink@ and a semi-physical simulation experiment platform of 30kVA HWT, the influence law of some parameters is analyzed for the response characteristics of the speed control system, such as the valve control cylinder response speed, the swash plate reference conversion value, initial swash plate angle and so on. At the same time, combined with the grid connection conditions for generators, a quasi-synchronized grid speed control method for HWT is proposed. Based on simulation and experimental methods, the instantaneous impact of grid connection is effectively suppressed.
Highlights
Wind energy is rich in reserves, renewable, widely distributed, and pollution-free
To ensure the efficient and safe grid connection of the HWT, the excitation synchronous generator and the hydraulic main transmission system composed of the fixed displacement pump-hydraulic motor are combined, and the speed control and quasisynchronous grid-connected control method are explored
The variable displacement motor is coaxially connected with the synchronous generator, and the synchronous generator is connected to the grid to generate electricity
Summary
TO HWT SYSTEM HWT mainly includes rotor, the fixed displacement pump, the variable displacement motor, synchronous generator. When the wind speed changes and the grid frequency fluctuates, this multiplier nonlinear characteristic needs to be studied to make the fixed displacement pump-variable motor system achieve variable speed input and constant speed output control requirements. This system can accurately control the motor speed at different working points to ensure that the output speed is controllable and adjustable, and realize that the hydraulic motor has consistent speed response characteristics at different system operating points, which can make the synchronous generator connect to the power grid smoothly. Considering the stiffness at the output of the variable motor is very large, it can be simplified as
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