涌流引起的变压器三角形侧不平衡三次谐波影响及抑制方法
发布时间：2018-09-04 11:18
【摘要】：稳态情况下,一般认为三次谐波具有零序分量特征,无法耦合至主变压器三角形侧设备,但经现场试验所得结论可知,和应涌流造成的不平衡三次谐波却可以流入主变压器低压侧,并与低压侧电容器组构成回路,有可能使电容器及避雷器损坏。系统稳态运行时,三次谐波仅仅存在零序分量;而和应涌流中的三次谐波电压、电流并不完全对称,存在三次谐波的正、负、零序分量,故涌流时的三次谐波的正序、负序分量能流出变压器的三角形侧,流入电容器组和负荷。同时,如果并联电容器组的电抗率为6%,则存在三次谐波串联谐振点,这是导致三次谐波进一步放大的原因。文中通过理论及仿真分析,论述了上述观点的正确性,并通过计算,设计出一种配置混合串联电抗器的并联电容器组。动模试验证明,配置混合串联电抗器的并联电容器组可以大大抑制系统侧及电容器支路中的三次及五次谐波,较配置统一串联电抗器的并联电容器组具有较大优势。
[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.
【作者单位】： 国网江苏省电力公司电力科学研究院;东南大学电气工程学院;国网江苏省电力公司;
【基金】：国家自然科学基金资助项目(50977012,51377022) 江苏省自然科学基金资助项目(BK20140113)~~
【分类号】：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.
【作者单位】： 国网江苏省电力公司电力科学研究院;东南大学电气工程学院;国网江苏省电力公司;
【基金】：国家自然科学基金资助项目(50977012,51377022) 江苏省自然科学基金资助项目(BK20140113)~~
【分类号】：TM407
【参考文献】
相关期刊论文 前5条
1 刘观起,李庚银,周明,张杰,马岗;混合滤波系统中无源滤波器的参数优化设计软件包[J];电力系统自动化;2000年11期
2 朱桂萍,王树民;电能质量控制技术综述[J];电力系统自动化;2002年19期
3 陈礼义，栗文义，，陈德生，阎华礼;配电系统谐波放大的分析与计算[J];电力系统自动化;1995年08期
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