Hydraulic wind power generation set and energy layered-controlled low-voltage ride through control method

Abstract

The invention relates to a hydraulic wind power generation set and an energy layered-controlled low-voltage ride through control method. When a power grid voltage drops due to a fault, top-layer control is that a pitch angle of a wind turbine is controlled by a pitch angle controller so as to reduce wind energy capturing; intermediate-layer control is that control on a pivot angle of a variable motor is realized by a rotational speed controller, a high-voltage pressure of a hydraulic system is reduced, so that the rotational speed of a fixed displacement pump is increased, and residual power is converted to kinetic energy of a wind wheel; and bottom-layer control is that the opening degree of a proportional throttle valve is controlled by a power controller, residual energy is converted to thermal energy, and finally, storage, consumption and release of residual energy are realized during the low-voltage ride through process. The transmission energy of the machine set is controlled by pitch adjustment, wind abandoning, inertia energy storage of the wind turbine and proportional throttling coordinated control, the residual energy of the machine set is suppressed from a source, and the energy loss during the low-voltage ride through process is also effectively prevented; and meanwhile, by adding a proportional throttling stage, the system response is sped up, and the system is flexible in action.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind turbine and a low voltage ride through control method. Background technique [0002] Energy is the foundation of human survival and development. With the development and progress of society, human demand for energy continues to grow. As an important and most mature renewable energy technology, wind energy has abundant reserves, wide distribution, renewable and pollution-free How to make full use of wind energy is an important direction for the development of renewable energy. [0003] From the perspective of transmission system, wind turbines can be divided into gearbox type, direct drive type and hydraulic type. As a new generation of wind power generation equipment, hydraulic wind turbines have received widespread attention. Compared with traditional models, on the one hand, the rigid transmission of the gearbox in most models is replaced by hydrostatic tr...

AI Technical Summary

Problems solved by technology

[0010] To sum up, the existing low-voltage ride-through control methods for hydraulic wind turbines generally have defects such as single control variable, slow response speed, low reliability, and fuzzy energy allocation scheme and coordinated control method of two control variables in the control process.

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