Energy storage type hydraulic wind generating set grid-connected rotating speed control system and method

Abstract

The invention relates to an energy storage type hydraulic wind generating set grid-connected rotating speed control system and method and belongs to the technical field of wind power generation technologies. The system comprises a wind turbine part, a hydraulic transmission part, a hydraulic energy storage part and a power generation part, when a wind turbine generator carries out grid-connected rotating speed control, variable pump motor swing angle control is preferred, energy conversion of an energy storage system is controlled, and the rotating speed of a variable motor is rapidly adjustedand stabilized, then a swing angle of the variable motor is controlled through indirect flow feedback and direct rotating speed closed-loop control, accurate control over the rotating speed of the variable motor is achieved, meanwhile, the opening degree of a valve port of a proportional throttle valve is controlled, the rotating speed of the variable motor is finely adjusted, accurate control over the rotating speed of the variable motor is achieved, redundant energy can be dissipated when system energy is excessive, and system safety is guaranteed. The system is advantaged in that through three-variable coordination control, a problem of accurate control over the grid-connected rotating speed of the system can be solved, the energy utilization rate is increased, and safe operation of the system is guaranteed.

Description

technical field [0001] The invention relates to a system and method for controlling the grid-connected speed of an energy storage hydraulic type wind power generating set, belonging to the technical field of wind power generation. Background technique [0002] With the increasing environmental and energy problems, wind power generation has attracted more and more attention at home and abroad, and the wind power industry has also developed rapidly. However, affected by climatic conditions, the output power of wind power generation has the characteristics of intermittent and randomness. Large-scale wind power grid connection will not only cause large power fluctuations, but also easily lead to the loss of system inertia and affect system frequency stability. In order to ensure the safe and stable operation of the power system when connected to the grid, it is necessary to improve the speed control effect of wind turbines connected to the grid. [0003] Energy storage hydraul...

AI Technical Summary

Problems solved by technology

[0007] Chinese patent CN102170134A proposes a microgrid grid-connected to off-grid control method, which can realize the balance between the power generation output and load power consumption of the microgrid at the moment of off-grid, and ensure the reliability and stability of the microgrid operation. However, this method does not explain how to control and realize grid-connected and off-grid functions from the input end of the generator

[0008] In summary, the existing hydraulic wind turbine grid-connected speed control methods are rare, and the control effect and technical defects need to be strengthened and improved

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