核工業(yè)脈沖發(fā)電機組工藝簡介及要求
脈沖發(fā)電機是一種慣性儲能技術(shù)，慣性儲能是依靠物體運動來存儲能量的方式，存儲在高速旋轉(zhuǎn)的飛輪或機械中的能量為旋轉(zhuǎn)機械能。一般使用較小功率的拖動機構(gòu)，以相對長的時間把一定質(zhì)量的轉(zhuǎn)子或飛輪慢慢地加速使其轉(zhuǎn)動起來從而存儲足夠的動能，根據(jù)需要利用其轉(zhuǎn)動慣性脈沖地驅(qū)動負載設(shè)備，把機械能轉(zhuǎn)變?yōu)殡姶拍堋?/p>
300MVA脈沖發(fā)電機組由8500kW繞線異步電動機及300MVA脈沖發(fā)電機組成為一同軸系聯(lián)軸器連接，機組飛輪力矩為7300t.m2。 8500kW電動機作為機組的拖動電機，基本參數(shù)為6000V、991A，轉(zhuǎn)子開路電壓2498V、轉(zhuǎn)子額定電流2062A。
圖1 脈沖發(fā)電機
風(fēng)水冷高壓變頻器技術(shù)總體方案
根據(jù)電機參數(shù)，選用HIVERT-Y6/1200（6kV/10000kW）高壓變頻裝置，額定輸出電流為1200A，適配電機功率為10000kW。由手車斷路器式自動旁路柜、啟動柜、主變壓器柜、功率單元柜、控制柜、水循環(huán)系統(tǒng)、接線柜等幾部分組成。該項目結(jié)合脈沖發(fā)電機組的工況特性，融入了全數(shù)字矢量控制、IGBT并聯(lián)設(shè)計、疊層母排技術(shù)、單元制動功能、水冷散熱方式等多項高端技術(shù)。
1.變頻裝置主電路圖
1.1 一次回路及保護
HIVERT系列高壓水冷變頻器采用交-直-交直接高壓（高-高）方式，主電路開關(guān)元件為IGBT，功率單元采用串聯(lián)，疊波升壓，充分利用高壓變頻器的成熟技術(shù)，具有很高的可靠性。
隔離變壓器為三相干式整流變壓器，風(fēng)水冷。變壓器原邊輸入可為任意電壓，Y接；副邊繞組數(shù)量依變頻器電壓等級及結(jié)構(gòu)而定，6kV系列為18個，延邊三角形接法，為每個功率單元提供三相電源輸入。為了最大限度抑制輸入側(cè)諧波含量，同一相的副邊繞組通過延邊三角形接法移相，繞組間的相位差由下式計算：
移相角度 = 60°/ 每相單元數(shù)量
由于為功率單元提供電源的變壓器副邊繞組間有一定的相位差，從而消除了大部分由單個功率單元所引起的諧波電流，所以HIVERT變頻器輸入電流的總諧波含量（THD）遠小于國家標準5%的要求，并且能保持接近1的輸入功率因數(shù)。三相輸出Y接，得到驅(qū)動電機所需的可變頻三相高壓電源。which is very convenient and fast for data processing In this project, there are a lot of data to be read and written, and array processing is adopted, which is very good
4 process treatment package
S7-1200 has customized PID and motion control instruction package, which makes it easier for engineers to complete process and positioning control.
5 custom software components
In the past, the definition of soft components by PLC was determined before leaving the factory. For example, the number of counters and timers can not be changed. Often, the number of applied soft components is different in different applications. Sometimes the timer runs out and a large number of counters remain. S7-1200 has many advantages in this point. Soft components can be defined by itself. If you want to use a few, you can define a few, which is much more flexible and convenient.
In addition, I believe that there are many new features in s7-1200 applications to be developed and experienced.
4. Product hardware configurationThis part mainly makes a detailed description of the product hardware design around SIMATIC s7-1200 in the whole projec
