Combined control wind power frequency modulation method for improving electric energy quality

Abstract

The invention discloses a wind power combined control frequency modulation method for improving electric energy quality. The micro-grid frequency modulation system is mainly composed of a wind power plant and a synchronous generator, in the continuous operation process of a micro-grid, the wind power access proportion with the low inertia is increased accordingly, and at the moment, the wind power plant will participate in micro-grid frequency modulation to meet the frequency modulation requirement of the system. Segmented droop control and fuzzy pitch angle cooperative control are used, so that frequency output, rotating speed change and pitch angle fluctuation of the doubly-fed asynchronous wind generator can be minimum, large frequency modulation power can be generated for standby application in a variable wind speed environment, meanwhile, the optimal frequency modulation effect is achieved, and the strategy is small in complexity and easy to implement. And related problems of frequency adjustment can be handled conveniently. The frequency fluctuation of the wind power system can be reduced, the frequency stability is improved, the frequency modulation effect is better than that of a traditional control strategy in different scenes such as different wind speed changes and load changes, and therefore the electric energy quality of a power grid is improved, and the service life of a wind turbine generator is prolonged.

Description

technical field [0001] The invention belongs to the field of frequency regulation control of wind turbines, in particular to a combined control wind turbine frequency regulation method for improving power quality applied to wind turbines. Background technique [0002] With the development and innovation of the power industry, the sensitive loads generated by power user equipment have higher requirements for power quality. The reduction of power quality affects the normal operation of electrical equipment, and even leads to interruption of the production process, making users bear additional economic losses. Frequency is an important indicator of power quality. As the proportion of wind power connected to the power system increases, the inertia of the overall system decreases, and the fluctuation of the system frequency becomes larger. Therefore, it is necessary to improve the frequency fluctuation from the perspective of the power generation side, thereby improving the power...

AI Technical Summary

Problems solved by technology

The pitch angle control can control the variation range of the wind turbine speed, but in terms of the variation degree of the pitch angle, the traditional two pitch angle controls CDPP and CDFP will have large fluctuations in the pitch angle during the frequency modulation control process, which is not conducive to the wind turbine. speed control

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