本文選題：地磁感應(yīng)電流 + 電磁式電流互感器�。� 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：電磁式電流互感器(CT)是目前廣泛應(yīng)用于電力系統(tǒng)中重要的電氣二次設(shè)備,能否安全可靠地傳變一次電流對電氣計(jì)量及繼電保護(hù)裝置都具有重要的影響。地磁感應(yīng)電流(GIC)和運(yùn)行于單極-大地回路方式的高壓直流輸電系統(tǒng)(HVDC)會(huì)使電力系統(tǒng)中的電磁式電流互感器產(chǎn)生直流偏磁,導(dǎo)致鐵心飽和、勵(lì)磁電流畸變并產(chǎn)生大量諧波,可能引起系統(tǒng)中電氣計(jì)量誤差和繼電保護(hù)裝置誤動(dòng),嚴(yán)重威脅電力系統(tǒng)的安全穩(wěn)定運(yùn)行。目前對磁暴侵害電力系統(tǒng)引起變壓器直流偏磁的問題展開了一系列研究,而對電磁式電流互感器的直流偏磁及其諧波的研究還比較有限。因此,本文提出對電磁式電流互感器的GIC諧波響應(yīng)特征的研究,對電力系統(tǒng)的安全穩(wěn)定運(yùn)行具有重要意義。 本文分析了地磁感應(yīng)電流作用下電流互感器直流偏磁的產(chǎn)生機(jī)理,研究了電流互感器GIC偏磁的等效電路及鐵心磁化模型,采用了基于Jiles-Atherton原理的電流互感器的模型。其次,在PSCAD/EMTDC電磁暫態(tài)仿真軟件中,建立了交流系統(tǒng)中GIC作用下的電流互感器的直流偏磁的等效模型,并仿真分析了GIC對CT穩(wěn)態(tài)和暫態(tài)傳變特性的影響。通過改變GIC的大小和頻率、電流互感器自身線圈的變比等影響因素,研究了勵(lì)磁電流畸變和各次諧波分布水平。最后,分析了電磁式電流互感器的偏磁飽和對計(jì)量和保護(hù)設(shè)備可能造成的影響,提出電流互感器諧波的抑制措施。
[Abstract]:Electromagnetic current transformer (CTT) is an important electrical secondary equipment widely used in power system at present. Whether the primary current can be transferred safely and reliably has an important influence on the electrical measurement and relay protection device. Geomagnetic inductive current (GIC) and HVDC (high voltage direct current transmission system) running in unipolar earth circuit mode can cause DC bias magnetic field of electromagnetic current transformer in power system, cause saturation of iron core, distortion of excitation current and produce a large number of harmonics. It may cause the error of electrical measurement and the maloperation of relay protection device in the system, which seriously threatens the safe and stable operation of the power system. At present, a series of researches have been carried out on the DC bias of transformer caused by magnetic storm, but the research on DC bias and its harmonics of electromagnetic current transformer is still limited. Therefore, the study of GIC harmonic response characteristics of electromagnetic current transformer is of great significance to the safe and stable operation of power system. The mechanism of DC bias of current transformer under the action of geomagnetic inductive current is analyzed in this paper. The equivalent circuit and core magnetization model of GIC bias current transformer are studied. The current transformer model based on Jiles-Atherton principle is adopted. Secondly, in the PSCAD / EMTDC electromagnetic transient simulation software, the equivalent model of DC bias of current transformer under GIC in AC system is established, and the influence of GIC on the steady state and transient transfer characteristics of CT is simulated and analyzed. By changing the size and frequency of the GIC and the variable ratio of the coil of the current transformer, the excitation current distortion and the distribution level of each harmonic wave are studied. Finally, the influence of bias saturation of electromagnetic current transformer on measurement and protection equipment is analyzed, and the harmonic suppression measures of current transformer are put forward.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM452

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本文編號(hào)：1985868