變頻調(diào)速能量回饋控制技術(shù)的現(xiàn)狀與發(fā)展趨勢(shì)-全文預(yù)覽
【正文】 x小于逆變電壓 Uβmin，于是帶來(lái)了兩個(gè)問(wèn)題 : 1) 較大的 αmin將引起波形畸變干擾電網(wǎng)，并降低了電網(wǎng)的功率因數(shù)。下面將要介紹幾種 基于晶閘管的有源逆變電路的結(jié)構(gòu)、基本原理以及優(yōu)、缺點(diǎn)的對(duì)比。 上述缺點(diǎn)決定了能耗制動(dòng)方式只能用于幾十 kW以下的中小容量系統(tǒng)。普遍存在的問(wèn)題是這些裝置價(jià)格昂貴，再加上一些產(chǎn)品對(duì)電網(wǎng)的要求很高，不適合我國(guó)的國(guó)情。由于二極管不控整流器能量傳輸不可逆，產(chǎn)生的再生電能傳輸?shù)?直流側(cè)濾波電容上，產(chǎn)生泵升電壓。三相交流電首先通過(guò)二極管不控整流橋得到脈動(dòng)直流電，再經(jīng)電解電容濾波穩(wěn)壓，最后經(jīng)無(wú)源逆變輸出電壓、頻率可調(diào)的交流電給電動(dòng)機(jī)供電。第二個(gè)環(huán)節(jié)是將由生產(chǎn)機(jī)械中儲(chǔ)存的動(dòng)能或勢(shì)能轉(zhuǎn)換而來(lái)的電能及時(shí)地、高效地 回收 到電網(wǎng)，即通過(guò)有源逆變裝置將再生能量回饋到交流電網(wǎng)，一方面是節(jié)能降耗，另一方面是實(shí)現(xiàn)電動(dòng)機(jī)的精密制動(dòng)，提高電動(dòng)機(jī)的動(dòng)態(tài)性能。采用變頻調(diào)速技術(shù)是節(jié)能降耗、改善控制性能、提高產(chǎn)品產(chǎn)量和質(zhì)量的重要途徑，已在應(yīng)用中取得了良好的應(yīng)用效果和顯著的經(jīng)濟(jì)效益。本文首先回顧了變頻調(diào)速能量回饋控制技術(shù)的發(fā)展歷史及現(xiàn)狀。它可以克服通用變頻器傳統(tǒng)制動(dòng)電阻方式低效、難以滿足快速制動(dòng)和頻繁正反轉(zhuǎn)的不足，使通用變頻器可在四象限運(yùn)行。 關(guān)鍵詞 :變頻調(diào)速技術(shù) 能量回饋 再生制動(dòng) PWM 控制 智能功率模塊 檢測(cè)技術(shù) Abstract: General inverter energy feedback control system is a kind of device which feeds the regenerative energy produced by motor when decelerates and brakes back to the AC power supply. It can overe the disadvantages of the traditional method in low efficiency because using braking resistance. And it is easy to meet the need of braking rapidly and the need of running between forward and reverse frequently. Therefore inverters can run in four quadrants. The paper firstly reviews the development history and current situations of inverter energy feedback control technology, then, the paper gives a kind of new type control system based by Intelligent Power Module (IPM), and introduces the design of the main circuit, control circuit, driving and protect circuit in detail, points out the development trend of inverter energy feedback control technology at last. Keywords : Frequency Converter Energy feedback Regenerative braking PWM control Intelligent Power Module
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