采用间隙和电阻串联的配网PT铁磁谐振消除方法  

Ferromagnetic Resonance Elimination Method on PT of Distribution Network Using Gap and Resistor in Series

作　　者：杨鑫[1] 陈欣刚 孙浩天 丁学辉 YANG Xin;CHEN Xingang;SUN Haotian;DING Xuehui(Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学,长沙410114

出　　处：《电力电容器与无功补偿》2022年第5期84-93,共10页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金青年基金项目(51407013);广东电网有限责任公司科技项目(GDKJXM20161905)。

摘　　要：配电网母线电磁式电压互感器(PT)高压侧中性点加装非线性电阻或高阻值电阻等消谐方法会导致PT末端的电压升高,开口三角零序电压过低等问题,本文提出在母线PT高压侧中性点加装间隙与阻尼电阻串联组合的消谐方法。以10 kV母线PT为应用对象,利用电磁暂态分析软件搭建了10 kV配电网分布参数电路模型,给出了间隙和电阻的选型原则,得到了间隙的放电电压和电阻的最佳取值。利用仿真模型,将PT一次侧加装间隙与电阻串联的消谐方法与加装高阻值电阻、非线性电阻进行了综合比较。结果表明,本文所提方法具有消谐时间短、PT末端电压水平低、不影响PT开口三角零序电压测量以及接地点容性电流小的特点,具有更好的综合消谐效果。Such harmonic elimination methods as installation of nonlinear resistors or high-resistance resistors to the neutral point of the high-voltage side of the bus electromagnetic voltage transformer(PT)of distribution network will cause such issues as voltage swell at the PT end and low open triangle zero sequence voltage.A harmonic elimination method of installing a gap and a damping resistor in series at the neutral point of the high-voltage side of the bus PT is proposed in this paper.The 10 kV bus PT is taken as the application object,the distributed parameter circuit model of the 10 kV distribution network is set up by using electromagnetic transient analysis software,the selection principles of the gap and resistoris given,thus,the optimal values of the discharge voltage and resistance of the gap are obtained.The harmonic elimination method of installing gap and resistor in series on the primary side of PT is comprehensively compared with that of installing the high resistance and nonlinear resistor by the use of the simulation model.The results show that the method proposed in this paper has such characteristics as short harmonic elimination time,low voltage level of the PT end,free from open triangle zero sequence voltage measurement of the PT and small capacitive current of the grounding point and has better harmonic elimination effect as well.

关 键 词：配电网 电压互感器 铁磁谐振 间隙 分布参数 

分 类 号：TM451[电气工程—电器]