摘要
随着风电和光伏发电系统的并网等级不断升高,在接入系统高压侧时不可避免地引入谐波。针对电容式电压互感器(CVT)应用于高压侧谐波测量的实际需求,这里通过对适用于CVT谐波测量方法进行理论分析,并设计分析相应的CVT谐波测量装置验证方法的可行性。在CVT的分压电容和中间变压器的接地支路分别接入高精密钳型电流互感器,在得出电流参数值基础上,根据基尔霍夫定律推导得出CVT一次侧谐波电压参数。计算结果可经以太网或USB 2.0接口实现数据上传。设计CVT谐波分析软件完成数据导出、显示以及存盘等操作。试验结果证明了所采用方法的正确性、设计方案的可行性以及CVT谐波测量装置的有效性。
As the grid connection level of wind power and photovoltaic power generation systems increases constantly,har-monics are inevitably introduced into the high voltage side of the access system.In allusion to the practical requirement of apply-ing the capacitor voltage transformer(CVT)to harmonic measurement in the high voltage side,theoretical analysis of method suitable for CVT harmonic measurement is performed,and the feasibility of the verification method for CVT harmonic measure-ment device is analyzed.The voltage-dividing capacitor of CVT and the grounding branch circuit of intermediate transformer are respectively connected to the high-precision pincer-shape current transformer.On the basis of obtaining current parameters,the CVT harmonic voltage parameters on primary side are obtained according to the derivation with Kirchhoff law.The calculation re-sults can be uploaded via Ethernet or USB 2.0 interface.The CVT harmonic analysis software was designed to complete the oper-ations such as data export,display and saving.The test results proved the correctness of the method adopted in this paper,the feasibility of the design scheme and the effectiveness of the CVT harmonic measurement device.
作者
宋雪莹
谭忠富
SONG Xueying;TAN Zhongfu(North China Electric Power University,Beijing 102206,China;Inner Mongolia University of Science&Technology,Baotou 014010,China)
出处
《现代电子技术》
北大核心
2018年第8期116-120,共5页
Modern Electronics Technique
基金
国家自然科学基金项目(71573084)~~
