涌流引起的變壓器三角形側不平衡三次諧波影響及抑制方法
發(fā)布時間：2018-09-04 11:18
【摘要】：穩(wěn)態(tài)情況下,一般認為三次諧波具有零序分量特征,無法耦合至主變壓器三角形側設備,但經現(xiàn)場試驗所得結論可知,和應涌流造成的不平衡三次諧波卻可以流入主變壓器低壓側,并與低壓側電容器組構成回路,有可能使電容器及避雷器損壞。系統(tǒng)穩(wěn)態(tài)運行時,三次諧波僅僅存在零序分量;而和應涌流中的三次諧波電壓、電流并不完全對稱,存在三次諧波的正、負、零序分量,故涌流時的三次諧波的正序、負序分量能流出變壓器的三角形側,流入電容器組和負荷。同時,如果并聯(lián)電容器組的電抗率為6%,則存在三次諧波串聯(lián)諧振點,這是導致三次諧波進一步放大的原因。文中通過理論及仿真分析,論述了上述觀點的正確性,并通過計算,設計出一種配置混合串聯(lián)電抗器的并聯(lián)電容器組。動模試驗證明,配置混合串聯(lián)電抗器的并聯(lián)電容器組可以大大抑制系統(tǒng)側及電容器支路中的三次及五次諧波,較配置統(tǒng)一串聯(lián)電抗器的并聯(lián)電容器組具有較大優(yōu)勢。
[Abstract]:In the steady state, it is generally considered that the third harmonic has the characteristics of zero sequence components and can not be coupled to the triangular side equipment of the main transformer. However, the field test results show that the third harmonic has the characteristics of zero sequence components. The unbalanced third harmonic caused by the inrush current can flow into the low-voltage side of the main transformer and form a circuit with the low-voltage side capacitor bank, which may damage the capacitor and arrester. When the system is in steady state, the third harmonic only has zero sequence component, and the third harmonic voltage in the inrush current is not completely symmetrical, and there exists the positive, negative and zero sequence components of the third harmonic, therefore, the positive order of the third harmonic in the inrush current. The negative sequence component flows out of the triangular side of the transformer into the capacitor bank and load. At the same time, if the reactance of the shunt capacitor bank is 6, there is the third harmonic series resonance point, which is the reason for further amplification of the third harmonic. Through theoretical and simulation analysis, this paper discusses the correctness of the above viewpoint, and designs a shunt capacitor bank with hybrid series reactor by calculation. The dynamic simulation tests show that the shunt capacitor banks with hybrid series reactors can greatly suppress the third and fifth harmonics in the system side and capacitor branches, which is superior to the shunt capacitor banks with unified series reactors.
【作者單位】： 國網江蘇省電力公司電力科學研究院;東南大學電氣工程學院;國網江蘇省電力公司;
【基金】：國家自然科學基金資助項目(50977012,51377022) 江蘇省自然科學基金資助項目(BK20140113)~~
【分類號】：TM407
[Abstract]:In the steady state, it is generally considered that the third harmonic has the characteristics of zero sequence components and can not be coupled to the triangular side equipment of the main transformer. However, the field test results show that the third harmonic has the characteristics of zero sequence components. The unbalanced third harmonic caused by the inrush current can flow into the low-voltage side of the main transformer and form a circuit with the low-voltage side capacitor bank, which may damage the capacitor and arrester. When the system is in steady state, the third harmonic only has zero sequence component, and the third harmonic voltage in the inrush current is not completely symmetrical, and there exists the positive, negative and zero sequence components of the third harmonic, therefore, the positive order of the third harmonic in the inrush current. The negative sequence component flows out of the triangular side of the transformer into the capacitor bank and load. At the same time, if the reactance of the shunt capacitor bank is 6, there is the third harmonic series resonance point, which is the reason for further amplification of the third harmonic. Through theoretical and simulation analysis, this paper discusses the correctness of the above viewpoint, and designs a shunt capacitor bank with hybrid series reactor by calculation. The dynamic simulation tests show that the shunt capacitor banks with hybrid series reactors can greatly suppress the third and fifth harmonics in the system side and capacitor branches, which is superior to the shunt capacitor banks with unified series reactors.
【作者單位】： 國網江蘇省電力公司電力科學研究院;東南大學電氣工程學院;國網江蘇省電力公司;
【基金】：國家自然科學基金資助項目(50977012,51377022) 江蘇省自然科學基金資助項目(BK20140113)~~
【分類號】：TM407
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4 楚p
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