Variable-speed variable-frequency(VSVF), a new typed operational mode for the induction generator based wind power generation system is proposed based on the fractional frequency power transmission.
在分析异步风力发电系统模型的基础上，结合分频输电技术，提出了一种新型的异步风力发电系统运行方式——变速变频（VSVF）方式。
Variable frequency and variable speed motor system is of high intelligence, high reliability, fault-tolerant capability.
变频调速电动机系统具有高智能、高可靠性和高容错能力。
The variable frequency variable speed system of three-phase asynchronous motor based on DSP has been researched in this paper.
本文研究一种基于数字信号处理器（DSP）的三相异步电动机变频调速系统。
Variable voltage and variable frequency system based on vector control is applied widely in high speed train.
基于矢量控制的变压变频调速在高速列车中得到广泛应用。
The topic of Energy saving on motor system has always being researched by scholars, and the variable frequency variable speed technology has been paid the focus attention among the researches.
电机节能问题一直是广大学者研究的热点，在电机节能技术中最受瞩目的是变频调速技术。
Therefore, it is necessary to study the frequency control strategy of the variable speed wind turbines, use variable speed wind turbines to improve the frequency control ability of the power system.
因此，有必要研究变速风电机组的频率控制策略，利用变速风电机组来提高电力系统的频率控制能力。
Variable frequency and variable speed motor system is of high reliability, fault-tolerant capability and high intelligence.
变频调速电动机系统具有高可靠性和高容错能力，具有高智能。
Variable frequency and variable speed motor system is of high reliability, fault-tolerant capability and high intelligence.
变频调速电动机系统具有高可靠性和高容错能力，具有高智能。
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