A full wind speed frequency response control method for doubly-fed wind turbines

Abstract

The invention discloses a full-wind-speed frequency response control method for a doubly-fed wind generator. According to the method, frequency response control can be conducted by actively identifying wind speed intervals and modifying a drooping coefficient in a self-adaptive mode. Firstly, the relation between the load shedding rate and the suboptimum tip speed ratio of the doubly-fed wind generator is established according to a doubly-fed wind power unit characteristic curve given by a manufacturer; a full wind speed is divided into a first wind speed interval, a second wind speed interval, a third wind speed interval and a fourth wind speed interval according to the wind speed from low to high; the division criterion of the four wind speed intervals is updated online according to the current load shedding rate of the doubly-fed wind generator; when the real-time frequency of a system is lowered and exceeds a set dead zone threshold, the wind speed intervals are identified according to collected real-time wind speed signals; real-time unit spare capacity is calculated, the drooping coefficient is modified in the self-adaptive mode, and then frequency response control is completed. By means of the method, the frequency response capability of the medium-wind-speed interval and the high-wind-speed interval can be improved, and the rotating speed of the generator in the weak-wind interval and the low-wind-speed interval can be not lower than the minimum allowed rotating speed.

Description

technical field [0001] The invention relates to a full wind speed frequency response control method of a doubly-fed wind power generator, which belongs to the field of frequency response control involving wind power generators. Background technique [0002] Due to the use of advanced power electronic converters, the doubly-fed wind turbines widely used in commercial applications at present realize the decoupling control of active power and reactive power, which also leads to the decoupling of the mechanical part of the wind turbine and the electromagnetic part of the system, and cannot provide power to the system. Provides inertial responsiveness. At the same time, in order to pursue the maximum economic benefits, the wind farm usually works in the maximum power tracking mode, which means that it cannot provide the system with spare capacity to participate in the primary adjustment of the system frequency. [0003] The current relatively mature frequency control strategy is...

AI Technical Summary

Problems solved by technology

However, in the process of simulating droop control characteristics, wind turbines are limited by objective conditions such as wind speed, and cannot completely imitate synchronous generators for primary frequency response control, and must be combined with their own conditions

Images