原料氣壓縮機(jī)電機(jī)采用英威騰GD5000矢量型高壓變頻器驅(qū)動(dòng)，主要參數(shù)如下：
英威騰GD5000系列矢量型高性能變頻器采用電壓源型單元串聯(lián)多電平高-高解決方案，直接6kV輸入、6kV輸出，接線簡單、控制靈活?？刂葡到y(tǒng)采用DSP+FPGA+ARM三核技術(shù)，對此種轉(zhuǎn)矩波動(dòng)大的螺桿式壓縮機(jī)采用無PG（速度傳感器）的電壓開環(huán)（SVC）控制。一方面可輕松實(shí)現(xiàn)低轉(zhuǎn)速、大轉(zhuǎn)矩的帶重載啟動(dòng)；另一方面，當(dāng)負(fù)荷波動(dòng)瞬間轉(zhuǎn)矩增大時(shí)，內(nèi)置的DSP高速數(shù)字處理芯片可在100毫秒內(nèi)迅速降低運(yùn)行轉(zhuǎn)速，提高輸出的電磁轉(zhuǎn)矩，防止因負(fù)載瞬間波動(dòng)電流突然增大造成的設(shè)備頻繁跳閘，滿足現(xiàn)場運(yùn)行工況要求。此外，對原料提純分離中的壓縮機(jī)組使用高壓變頻調(diào)速還有如下幾大優(yōu)勢：
電機(jī)為額定頻率60HZ的變頻電機(jī)，采用直驅(qū)方式，中間省去了增速箱等附屬裝置，降低了系統(tǒng)損耗。使用變頻傳動(dòng)，滿足轉(zhuǎn)速輸出要求，其輸出頻率范圍0.5～120HZ，頻率分辨率0.01HZ；提高了傳動(dòng)效率和控制精度。
采用DCS集中控制，起停采用現(xiàn)場硬接線按鈕，不僅滿足了設(shè)備運(yùn)行的安全可靠，而且還提高了工藝流程優(yōu)化調(diào)整和監(jiān)控的實(shí)時(shí)性和靈活性。其系統(tǒng)控制圖如下所示：
原料氣儲罐容積有限從而造成壓縮機(jī)吸氣壓力不穩(wěn)定，負(fù)荷隨時(shí)間無規(guī)律波動(dòng)。使用變頻調(diào)速可在壓縮機(jī)出口加裝壓力傳感變送器，變頻器可根據(jù)負(fù)荷變化實(shí)時(shí)調(diào)整運(yùn)行轉(zhuǎn)速，實(shí)現(xiàn)輸出壓力恒定的閉環(huán)控制。運(yùn)行頻率越低，制冷壓縮機(jī)的能耗也越低，從而在滿足工藝要求的條件下能實(shí)現(xiàn)一定的節(jié)能降耗。
化工企業(yè)生產(chǎn)設(shè)備繁多，經(jīng)常大批量同時(shí)啟動(dòng)時(shí)容易造成廠內(nèi)母線電壓陡降，引起設(shè)備欠壓跳閘。GD5000系列變頻器具有優(yōu)良的抗電網(wǎng)電壓波動(dòng)性能。網(wǎng)側(cè)電壓在+10%～-15%之間波動(dòng)時(shí)可做到滿載輸出。同時(shí)具有AVR功能，能夠根據(jù)母線電壓的波動(dòng)自動(dòng)調(diào)整輸出電壓。網(wǎng)側(cè)電壓在短時(shí)間小于85%～65%額定值或大于110%～120%額定值時(shí)，高壓變頻器降額運(yùn)行不停機(jī)，可保證壓縮機(jī)持續(xù)運(yùn)行。
?作為工藝循環(huán)中的關(guān)鍵負(fù)載，GD5000系列變頻器具有功率單元工作情況（溫度、直流母線電壓、電流等）的實(shí)時(shí)監(jiān)控和單元自動(dòng)旁路功能。
5.結(jié)束語encoder speed to motor speed is: I. the accuracy of coding / motor calibration coefficient directly affects the accuracy and rapid response ability of the equipment. Its calculation principle is to sample and calculate the average value, and then take the difference between the average value and the theoretical value as the reference value of calibration coefficient. The more samples, the closer to the actual value. This program selects 400 samples. Since only one data can be sampled in a scanning period, if an inappropriate number is selected, there may be response lag or great fluctuation.
As shown in Section 16 of the main program:
In the program, each scan reads a value from the array, and then sends it to the cumulative value (md10) for addition until 400 numbers are taken and the average value is calculated. The result is subtracted from the theoretical value (MD300) to obtain the correction coefficient (wr251)
The judgment and correction of deviation in the system is also a part of the main calculation of this program. In this system, when the speed is determined, the rotating speed of the cutter is constant. When the cutter rot
