摘要
为了实时动态地消除电压互感器二次回路压降带来的计量误差．对电压互感器二次回路压降的自动补偿进行了研究。在对电压互感器二次回路压降进行理论分析的基础上。提出了动态补偿原理．进行了系统硬、软件设计。通过单片机的智能控制，实时跟踪电压互感器二次压降变化，实时调整信号放大倍数．实现动态补偿和阻抗匹配。模拟补偿试验和现场测试结果均表明：在额定线电压为100V的情况下．无论线路电阻在0．3-5Ω的规定范围内如何变化，补偿后合成电压均小于144mV．即符合“不大于额定二次电压的0.25％”这一规定标准．且其角差小于1’。
To eliminate the measurement error caused by PT secondary voltage drop,the automatic compensation for it is researched. The dynamic compensation principle and the design of system software and hardware are proposed based on its analysis. With the intelligent control by singlechip,the variation of PT secondary voltage drop is tracked and the amplifier gain is adjusted in real time to realize dynamic compensation and impedance matching. Results of simulative experiment and site test show that, when the nominal line voltage is 100 V and the line resistance change is within the specified scope of 0.3-5Ω,the synthesized voltage after compensation is less than 144 mV,conforming to the standard of ＂not more than 0.25 % of nominal secondary voltage＂ , and the angle differenee is less than 1＇.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第6期93-97,共5页
Electric Power Automation Equipment
关键词
电压互感器
二次侧压降
计量误差
动态补偿
智能控制
potential transformer
secondary voltage drop
computation error
dynamic compensation
intelligent control
