本文關(guān)鍵詞： 電壓源換流器型高壓直流 直流輸電線路 模型識(shí)別 相關(guān)系數(shù) 縱聯(lián)保護(hù)　出處：《電力系統(tǒng)自動(dòng)化》2014年10期 　論文類型：期刊論文

【摘要】：電壓源換流器型高壓直流(VSC-HVDC)輸電控制系統(tǒng)復(fù)雜,故障承受能力差,線路保護(hù)裝置動(dòng)作正確率不高。文中提出了一種利用模量模型識(shí)別的VSC-HVDC輸電線路縱聯(lián)保護(hù)新原理。該原理將區(qū)外故障等效為正的電容模型,差動(dòng)電流和差動(dòng)電壓導(dǎo)數(shù)相關(guān)系數(shù)為1;將區(qū)內(nèi)故障等效為負(fù)的電容模型,差動(dòng)電流和差動(dòng)電壓導(dǎo)數(shù)相關(guān)系數(shù)為-1。通過判別相關(guān)系數(shù)的正負(fù),即可區(qū)分區(qū)內(nèi)、區(qū)外故障。在實(shí)際運(yùn)行中,VSC-HVDC輸電系統(tǒng)多為雙極運(yùn)行,為降低極間電磁耦合的影響,采用了1模和0模量構(gòu)成判據(jù)。理論分析和PSCAD仿真實(shí)驗(yàn)表明,新原理無(wú)需補(bǔ)償輸電線路電容電流,原理簡(jiǎn)單、易于整定,不受過渡電阻和控制特性的影響,在各種工況下均能快速可靠地區(qū)分區(qū)內(nèi)、區(qū)外故障。
[Abstract]:The VSC-HVDC (Voltage Source Converter) transmission control system is complex and its fault bearing capacity is poor. This paper presents a new principle of VSC-HVDC transmission line longitudinal protection based on modulus model, which equates the fault out of the area to a positive capacitance model. The correlation coefficient of differential current and differential voltage derivative is 1; The differential current and differential voltage derivative correlation coefficient is -1. By discriminating the positive and negative correlation coefficients, the faults in and out of the region can be distinguished. In order to reduce the effect of electromagnetic coupling between poles, the criterion of 1 mode and 0 modulus is adopted in VSC-HVDC transmission system. The theoretical analysis and PSCAD simulation show that the criterion can be used to reduce the effect of electromagnetic coupling between poles. The new principle does not need to compensate the capacitive current of the transmission line. The principle is simple and easy to set, and it is not affected by the transition resistance and control characteristics. It can quickly and reliably fault in and out of the area under various working conditions.
【作者單位】： 西安交通大學(xué)電氣工程學(xué)院;國(guó)網(wǎng)安徽省電力公司經(jīng)濟(jì)技術(shù)研究院;國(guó)網(wǎng)重慶市電力公司江北供電分公司;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51037005,51177128) 教育部博士點(diǎn)基金資助項(xiàng)目(20110201110056)~~
【分類號(hào)】：TM721.1
【正文快照】： 0引言 *or-M m n:^,, 電壓源換流器型高壓直流(voltage sourcet」iwnp ihconverter based HVDC,VSC-HVDC)輸電是一種I、丨TFT^^i^pfa-h pb 以可控關(guān)斷電力電子器件和脈寬調(diào)制(PWM)技術(shù)為基礎(chǔ)的新型直流輸配電技木,在新能源發(fā)電并網(wǎng)、7FTT/4f cfa 4^7^tfa B■止六法nfa I77T"FT

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本文編號(hào)：1449890