城軌列車牽引逆變器脈寬調(diào)制方法研究
秦偉志,郭其一
(同濟(jì)大學(xué) 電子與信息工程學(xué)院,上海 201804)
摘 要:城軌列車牽引傳動(dòng)系統(tǒng)開關(guān)頻率較低,需要根據(jù)不同工況分段選擇脈寬調(diào)制技術(shù)。介紹了分段調(diào)制技術(shù)和指定諧波消除脈寬調(diào)制(SHEPWM)技術(shù),針對(duì)傳統(tǒng)數(shù)值方法計(jì)算SHEPWM開關(guān)角存在的局部收斂、過程復(fù)雜等問題,設(shè)計(jì)了將擬牛頓法和遺傳算法結(jié)合的混合遺傳算法,可以實(shí)現(xiàn)全局收斂并減少計(jì)算復(fù)雜性;對(duì)不同載波比SHEPWM 的切換過程進(jìn)行分析,得到諧波電流沖擊最小的切換點(diǎn)。使用Matlab/Simulink進(jìn)行仿真,驗(yàn)證了混合遺傳算法的全局收斂性和精確性,并對(duì)開關(guān)器件輸出電流進(jìn)行快速傅里葉變換(FFT)分析,驗(yàn)證了SHEPWM算法可以有效消除低次諧波。
關(guān)鍵詞:牽引逆變器;分段調(diào)制;混合遺傳算法;指定諧波消除脈寬調(diào)制;平滑切換
中圖分類號(hào):TM464 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2020)12-0007-06
Research on Pulse Width Modulation Method of Traction Inverter of Urban Rail Train
QIN Wei-zhi, GUO Qi-yi
(College of Electronic and Information Engineering, Tongji University, Shanghai 201804, China)
Abstract: The switching frequency of electric locomotive traction drive system is low and pulse width modulation technology needs to be selected according to different working conditions. This paper introduced the segmented modulation technology and the specified harmonic elimination pulse wide modulation (SHEPWM) technology, and designs a hybrid genetic algorithm, which effectively realizes the global convergence of the calculation results and reduces the computational complexity; for the synchronization between different modes of the modulation section the switching impact current is analyzed, and the switching point with the smallest harmonic current impact is obtained. Using Matlab/Simulink to do simulation verifies the global convergence and accuracy of the hybrid genetic algorithm, and performs fast Fourier transform (FFT) analysis on the output current of the switching device, which verifies that the SHEPWM algorithm can effectively eliminate low-order harmonics.
Key words: traction inverter; segment modulation; hybrid genetic algorithm; specified harmonic elimination pulse width modulation; smooth switching
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