Detection of the real - time fundamental negative - and positive - sequence components is the key of this technique 正負序基頻分量的實時快速提取,對于該方法的實際應用具有十分重要的意義。
This thesis proposed a real - time detection method for fundamental negative - and positive - sequence based on space vector 本文提出了一種基于空間矢量概念的基波正序、負序分量實時提取新方法。
A simple and easy operating criterion is put forward in accordance with the relation between positive - sequence component and negative - sequence component of stator current when the motor is in unbalance and single phase broken . based on analyzing the traditional inverse time - lag overloading protection of motors , an inverse time - lag operating equation with accumulating stator current is achieved , according to the differential equation of the heating and cooling while the current flows into the conductor 在分析電動機傳統(tǒng)的反時限過負荷保護的基礎上,根據(jù)導體中流過電流時的發(fā)熱、散熱微分方程得到了累加定子電流的反時限過負荷保護動作方程,經(jīng)簡化后得到累加定子電流的實用的反時限特性遞推公式。
In order to consider the different heating of positive - sequence current and negative - sequence current of the motor stator generally , the equivalent current is adopted instead of the traditional phase current . the way how to gather positive - sequence current and negative - sequence current is brought forward , and the recurrence fourier - algorithm is adopted to calculate the effective value of current and voltage , the effective value of positive - sequence current and negative - sequence current 為了全面考慮感應電動機定子正序電流和負序電流的不同發(fā)熱效應,提出了正序電流和負序電流獲取的方法,并采用遞推傅氏算法來實現(xiàn)電流、電壓及電流正序和負序分量的有效值的計算。