發(fā)布時間：2018-05-13 05:13

  本文選題：電容式電壓互感器 + 級聯(lián)分級分析��； 參考：《中國電機工程學報》2014年28期

【摘要】：針對66 kV以上等級電網(wǎng)大多采用電容式電壓互感器(capacitor voltage transformer,CVT)、其諧波傳變特性定量規(guī)律不明、不宜進行諧波電壓測量的現(xiàn)狀,論證諧波條件下的CVT可等效為一線性電路,并以此為基礎提出級聯(lián)分級分析方法。結(jié)合實際參數(shù)對每級諧波傳變特性進行分析,獲得CVT電路參數(shù)對其諧波傳變特性的定量影響規(guī)律,即明確利用CVT測量諧波電壓的影響因素。仿真結(jié)果表明:中間變壓器一次側(cè)線圈的等效雜散電容將導致CVT幅頻特性在1 kHz之后的某頻率點發(fā)生放大;阻尼器參數(shù)影響50 Hz以上頻段的頻率特性變化率;負荷在1~10倍額定負荷范圍變化以及中間變壓器勵磁阻抗在0.1~1倍額定參數(shù)范圍變化時對CVT頻率特性的影響可忽略。所得結(jié)論對CVT產(chǎn)品設計及利用其測量諧波電壓具有借鑒意義。
[Abstract]:In view of the fact that capacitors voltage transformers are mostly used in 66 kV or above power networks, the quantitative law of harmonic transmission characteristics is unknown and it is not suitable to measure harmonic voltage. It is proved that the CVT under harmonic condition can be equivalent to a linear circuit. On this basis, a cascade hierarchical analysis method is proposed. Based on the analysis of the harmonic transmission characteristics of each order based on the actual parameters, the quantitative influence of CVT circuit parameters on the harmonic transmission characteristics is obtained, that is, the influence factors of measuring harmonic voltage by CVT. The simulation results show that the equivalent stray capacitance of the primary side coil of the intermediate transformer will result in the amplification of the CVT amplitude-frequency characteristic at a frequency point after 1 kHz, and the damper parameters will affect the frequency characteristic change rate of the frequency band above 50 Hz. The influence of load range of 10 times rated load on the frequency characteristics of CVT can be neglected when the excitation impedance of intermediate transformer changes in the range of 0.1 times rated parameters. The conclusions can be used for reference in the design of CVT products and the measurement of harmonic voltage.
【作者單位】： 中國電力科學研究院;
【基金】：國家電網(wǎng)公司科技項目(SGTGY JSFW(2012)346)~~
【分類號】：TM451.2

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本文編號：1881803