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本項(xiàng)目所用變頻器為合康HIVERT-YVF10/154，矢量控制、能量回饋、四象限運(yùn)行，采用轉(zhuǎn)子帶速度反饋的矢量控制技術(shù)。由汽輪機(jī)+電機(jī)+四象限高壓變頻器構(gòu)成一套完整的發(fā)電系統(tǒng)。系統(tǒng)轉(zhuǎn)速穩(wěn)定控制由汽輪機(jī)按DCS指令統(tǒng)一調(diào)度。變頻器接收來自本地或上位機(jī)的給定和邏輯指令，根據(jù)這些指令，由變頻控制自動(dòng)完成發(fā)電運(yùn)行的過程。變頻器采用反力矩方式控制發(fā)電。
圖1 現(xiàn)場系統(tǒng)拓?fù)鋱D
在該項(xiàng)目中監(jiān)視器主要包含三方面：上位通訊數(shù)據(jù)交換、實(shí)現(xiàn)功率閉環(huán)功能、系統(tǒng)保護(hù)；控制器主要實(shí)現(xiàn)以下三個(gè)功能：轉(zhuǎn)速啟動(dòng)、反力矩方式控制、防反轉(zhuǎn)功能。
2.1 功率開環(huán)/閉環(huán)控制
開環(huán)控制：上位機(jī)給定系統(tǒng)發(fā)電量，監(jiān)視器采用接口板所采集的變頻器輸入功率作為反饋信號進(jìn)行閉環(huán)調(diào)節(jié)。
閉環(huán)控制：上位機(jī)給定變電所進(jìn)線功率目標(biāo)值，然后通過通信將變電所進(jìn)線功率的實(shí)時(shí)采樣值傳輸給監(jiān)視器，監(jiān)視器將其作為反饋值進(jìn)行閉環(huán)PI調(diào)節(jié)。
因此開環(huán)控制與閉環(huán)控制所采用的控制模式是一樣的，但是采用的輸入值與反饋值存在區(qū)別。
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