Wind turbine generator protective control system under various working conditions

Abstract

The invention discloses a wind turbine generator protective control system under various working conditions. The wind turbine generator protective control system is characterized in that a control model of the control system is firstly established according to control characteristics of a wind turbine generator; a rotation speed controller which adopts a transient-state control strategy and a steady-state control strategy to operate in parallel is used for judging which rotation speed protective control method is adopted according to the specific condition of the special working condition; when a power grid is in a steady state, the rotation speed controller under the steady-state control strategy is adopted, so that a fan safely operates under rated rotation speed; when the wind turbine generator operates under a special working condition, rotation speed control under the transient-state control strategy must be automatically switched to, a phenomenon that the wind turbine generator exceeds speed as a result of a special working condition or power of the wind turbine generator sharply increases as a result of voltage fluctuation of the power grid can be restrained by quick response, and input power of the wind turbine generator is reduced to adapt to reduction of output electric energy under faults of the power grid.

Description

technical field [0001] The invention relates to the technical field of fan control, in particular to a protection and control system for wind turbines under various working conditions. Background technique [0002] At present, in the development of various renewable energy sources, the development of wind power has the most potential, the cost of power generation is gradually reduced, and the technology is becoming more and more mature, thus forming a new industry and becoming the fastest growing relative to the power system structure. New energy power generation. Therefore, the research on wind power generation technology is of great significance. [0003] The randomness and uncertainty of wind energy make the electric power, frequency, and voltage output by wind turbines change with the wind speed, so the power quality must be controlled and adjusted. However, the wind turbine system has the characteristics of strong nonlinearity, uncertainty, and multiple disturbances, ...

AI Technical Summary

Problems solved by technology

However, the environment is often not always the same, and there are the following defects, such as (1) in the state of low voltage ride through, the active power of the unit gradually decreases, causing the speed of the unit to increase, causing overspeed

(2) During the grid voltage recovery process, due to the slow return speed of the pitch, the recovery of active power is slow

(3) In the case of extreme gusts, the fan quickly responds to the wind speed control to make the fan overspeed

(4) The grid voltage is higher than the rated voltage, causing the wind turbine to overspeed

Images