本文選題：特高壓 + 調(diào)壓變壓器��； 參考：《電工技術(shù)學報》2017年20期

【摘要】：有載調(diào)壓技術(shù)已在中國特高壓交流輸電系統(tǒng)中實現(xiàn)了應(yīng)用,這對特高壓變壓器運行的可靠性提出了更高要求。有載調(diào)壓過程中,由于無法獲知調(diào)壓變壓器的實際運行檔位,差動保護裝置不能根據(jù)實時的額定電流之比調(diào)整平衡系數(shù),只能選取一個固定檔位下調(diào)壓變壓器兩側(cè)額定電流之比來計算其差動電流,因而會造成很大誤差。工程上,設(shè)置調(diào)壓變壓器不靈敏段差動來躲過調(diào)檔產(chǎn)生的不平衡電流,這不僅增加了調(diào)壓操作的復(fù)雜性,還降低了調(diào)壓變壓器差動保護的靈敏度。針對上述問題,基于特高壓變壓器電氣結(jié)構(gòu)提出一種在線自適應(yīng)獲取調(diào)壓變壓器運行檔位的方法,通過實時計算調(diào)壓變壓器運行時的端電壓之比,對差動電流計算結(jié)果進行修正,精確求得有載調(diào)壓過程中調(diào)壓變壓器的實時差動電流。數(shù)字仿真證明了基于自適應(yīng)算法的調(diào)壓變壓器差動保護動作特性不受短路匝數(shù)和運行檔位變化影響,可有效解決現(xiàn)有特高壓有載調(diào)壓變壓器差動保護策略識別匝間故障時靈敏度不足的問題。
[Abstract]:The on-load voltage regulation technology has been applied to the UHV AC transmission system in China, which puts forward higher requirements for the reliability of UHV transformer operation. In the process of on-load voltage regulation, the differential protection device can not adjust the balance coefficient according to the ratio of rated current in real time, because it is unable to know the actual operating gear of the voltage regulating transformer. The differential current can only be calculated by selecting one fixed gear to reduce the rated current ratio on both sides of the transformer, which will cause a great deal of error. In engineering, the differential of the insensitive section of the regulating transformer is set to avoid the unbalance current generated by the overadjustment, which not only increases the complexity of the voltage regulation operation, but also reduces the sensitivity of the differential protection of the voltage regulating transformer. In order to solve the above problems, based on the electrical structure of UHV transformer, an on-line adaptive method for obtaining the operating gear of voltage regulating transformer is proposed, and the ratio of terminal voltage to voltage during operation of the transformer is calculated in real time. The calculation results of differential current are corrected and the real time differential current of transformer during on-load voltage regulation is accurately obtained. The digital simulation proves that the operation characteristics of differential protection of voltage regulating transformer based on adaptive algorithm are not affected by the number of short circuit turns and the change of running gear. It can effectively solve the problem that the sensitivity of the existing differential protection strategy of UHV on-load transformer for inter-turn fault identification is insufficient.
【作者單位】： 新能源電力系統(tǒng)國家重點實驗室(華北電力大學);江蘇省電力公司南京供電公司;
【基金】：國家重點研發(fā)計劃智能電網(wǎng)技術(shù)與裝備重點專項(2016YFB0900604) 國家自然科學基金(51677069)資助項目
【分類號】：TM774

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