Detection of the real - time fundamental negative - and positive - sequence components is the key of this technique 正負(fù)序基頻分量的實(shí)時(shí)快速提取,對(duì)于該方法的實(shí)際應(yīng)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(fù)序分量實(shí)時(shí)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(dòng)機(jī)傳統(tǒng)的反時(shí)限過負(fù)荷保護(hù)的基礎(chǔ)上,根據(jù)導(dǎo)體中流過電流時(shí)的發(fā)熱、散熱微分方程得到了累加定子電流的反時(shí)限過負(fù)荷保護(hù)動(dòng)作方程,經(jīng)簡(jiǎn)化后得到累加定子電流的實(shí)用的反時(shí)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(yīng)電動(dòng)機(jī)定子正序電流和負(fù)序電流的不同發(fā)熱效應(yīng),提出了正序電流和負(fù)序電流獲取的方法,并采用遞推傅氏算法來實(shí)現(xiàn)電流、電壓及電流正序和負(fù)序分量的有效值的計(jì)算。