摘要：本文主要介紹了四方V560高性能變頻在雙吊點(diǎn)啟閉機(jī)主從控制上的應(yīng)用，成功的解決了兩臺(tái)以上電機(jī)同時(shí)驅(qū)動(dòng)一個(gè)剛性負(fù)載時(shí)，容易造成負(fù)載分配不均勻的問(wèn)題，合理的解決了一臺(tái)電機(jī)拖動(dòng)另一臺(tái)電機(jī)工作的現(xiàn)象。
關(guān)鍵字：?jiǎn)㈤]機(jī)；雙吊點(diǎn)；變頻器；V560
一、RELIANCE 803.65.00 BOARD引言
近年來(lái)，隨著國(guó)家建設(shè)的大力發(fā)展，啟閉機(jī)在電力建設(shè)、水利建設(shè)、運(yùn)輸港口上的應(yīng)用越來(lái)越廣泛。當(dāng)啟閉機(jī)在起吊比較寬的閘門(mén)的時(shí)候，單吊點(diǎn)就不能滿足閘門(mén)啟閉的要求，這時(shí)我們就要用到雙吊點(diǎn)結(jié)構(gòu)型式的啟閉機(jī)來(lái)起吊閘門(mén)。
四方V560系列高性能閉環(huán)矢量型變頻器，可以實(shí)現(xiàn)高啟動(dòng)轉(zhuǎn)矩和超低速運(yùn)行。本文主要介紹如何將V560系列變頻器成功運(yùn)用于雙吊點(diǎn)啟閉機(jī)的主從控制。
二、RELIANCE 803.65.00 BOARD系統(tǒng)概述
以江門(mén)某水電站中的啟閉機(jī)舉例說(shuō)明，現(xiàn)場(chǎng)為2×1500KN固定卷?yè)P(yáng)式啟閉機(jī)，采用雙吊點(diǎn)結(jié)構(gòu)形式，由兩套直徑為Φ900mm的卷筒分別帶動(dòng)一套起重吊具。每套機(jī)構(gòu)分別由一臺(tái)75kW電動(dòng)機(jī)通過(guò)一個(gè)硬齒面臥室減速器帶動(dòng)卷筒轉(zhuǎn)動(dòng)。兩套機(jī)構(gòu)之間通過(guò)聯(lián)軸器和剛性軸聯(lián)接，以保持兩吊點(diǎn)起升的同步性。兩套機(jī)構(gòu)由一個(gè)液壓制動(dòng)器控制抱閘。
電氣系統(tǒng)上由于異步電機(jī)滑差的特性決定了在兩臺(tái)以上電機(jī)同時(shí)驅(qū)動(dòng)一個(gè)剛性負(fù)載時(shí)，會(huì)發(fā)生負(fù)載分配不均的現(xiàn)象，嚴(yán)重的情況下甚至可能在輕負(fù)載狀態(tài)下發(fā)生一臺(tái)電機(jī)拖著另一臺(tái)電機(jī)工作，一臺(tái)電機(jī)處于電動(dòng)狀態(tài)，一臺(tái)電機(jī)處于發(fā)電狀態(tài)的情況。為了避免這種情況，使啟閉機(jī)每個(gè)吊點(diǎn)的負(fù)載均勻分配，雙吊點(diǎn)啟閉機(jī)每個(gè)吊點(diǎn)起升機(jī)采用變頻主從控制方法，可以很好的解決以上問(wèn)題。
三、RELIANCE 803.65.00 BOARD系統(tǒng)控制方案及配置
啟閉機(jī)兩套起升機(jī)構(gòu)采用四方V560高性能矢量變頻器，兩臺(tái)變頻器均采用閉環(huán)矢量控制，主變頻器做速度控制，從變頻器作轉(zhuǎn)矩控制，主變頻器的兩個(gè)模擬量AO1、AO2輸出端子分別輸出頻率指令和轉(zhuǎn)矩指令，頻率指令用0~10V信號(hào)，轉(zhuǎn)矩指令用-10V~10V信號(hào)。從變頻器的AI1端子接受主變頻的AO1端子輸出信號(hào)作為速度限制，從變頻的AI3端子接受主變頻器的AO2端子輸出信號(hào)作為轉(zhuǎn)矩指令。當(dāng)開(kāi)始工作的時(shí)候，主變頻器驅(qū)動(dòng)負(fù)載會(huì)產(chǎn)生一個(gè)實(shí)際的內(nèi)部轉(zhuǎn)矩指令，將此轉(zhuǎn)矩指令輸出給做轉(zhuǎn)矩控制的從變頻器，從變頻器也會(huì)輸出一個(gè)同樣大小的轉(zhuǎn)矩，這樣兩臺(tái)變頻器輸出的轉(zhuǎn)矩一樣，就不會(huì)出現(xiàn)負(fù)載不均衡的現(xiàn)象。主變頻器的頻率指令輸出給從變頻器作為速度限制，RELIANCE 803.65.00 BOARD如此從變頻器的速度就被限制在和主變頻器當(dāng)前相同的運(yùn)行速度。
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