Control method for active power output of doubly-fed wind turbine generator on electricity limitation and wind curtailment working condition

Abstract

The invention relates to a control method for active power output of a doubly-fed wind turbine generator on an electricity limitation and wind curtailment working condition. According to the control method, a generator operating track controller is established, and an operating point transfer track optimization model with the minimum overall adjustment quantity of the rotation speed and the pitch angle of the generator as an objective function and with active balance, the stability of operating points and the like of the generator as constraint conditions is solved in real time so that an optimal transfer track of the generator can be obtained; furthermore, traditional control strategies of a variable pitch system and a rotor-side frequency converter are improved so that the active power of the generator can be adjusted and controlled along the optimal transfer track of the operating points, and an electricity limitation and wind curtailment command of a power grid dispatching department can be completed. The control method is applicable to active power control of the doubly-fed wind turbine generator on the electricity limitation and wind curtailment working condition, the wind turbine generator can accurately execute the electricity limitation and wind curtailment command of the power grid dispatching department, the overall adjustment quantity of the rotation speed and the pitch angle of the generator can be reduced in the operating process, the service life of the generator can be prolonged, and the method has important engineering application value.

Description

technical field [0001] The invention belongs to the field of wind power generation, and relates to a method for controlling the active output of a doubly-fed wind turbine, in particular to a method for controlling the active output of a doubly-fed wind turbine under the condition of power limitation and wind abandonment. Background technique [0002] Due to the unilateral rapid development of wind power and the relatively lagging behind in grid construction, large-scale wind power grid integration brings increasingly severe challenges to grid power balance and safe and economic operation. In order to ensure the safe and economical operation of the system, it has become normal for wind farms to receive orders from the power grid dispatching department to operate under power-limited and wind-abandoned conditions during certain periods of time. The operation of wind power curtailment and wind abandonment in wind farms is equivalent to having the ability of thermal backup of pow...

AI Technical Summary

Problems solved by technology

However, frequent adjustment of speed and pitch angle will easily cause mechanical fatigue of the unit and affect its service life. None of the existing control methods can solve this problem, and it is difficult to apply it in practice.

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