电子式互感器相位补偿方法研究

根据电子式互感器的信号传输原理,提出了一套相位补偿方法。简要分析了电子式互感器产生误差的原因,对Rogowski线圈产生的相位超前和高压侧向合并单元传输信号所产生的延时分别作出定义和分析。针对这2种原因产生的相位误差设计出了一套完整的补偿方法,由于Rogowski线圈产生的相位超前,设计了一种采用ADE 7759芯片的数字积分电路,可基本还原线圈引起的超前相位;由于传输过程中产生的延时,介绍了一种移相用软件算法,可对延时进行有效补偿。该算法在合并单元数字信号处理器(DSP)中执行,经测试后效果良好。最后,对补偿过程中出现的问题进行了分析,并设计了解决方案。

Research on phase compensation of electronic transformer

A set of phase compensation methods based on the signal transfer principle of electronic transformer is presented.The cause of phase error in electronic transformer is analyzed.The phase-lead caused by Rogowski coil and time-delay in signal transferring from high voltage side to merging unit are defined and analyzed.A set of integrated compensation programs is designed based on phase errors above mentioned.A digital integral circuit with ADE 7759 is designed for com-pensating the led phase;a phase-shifted software algorithm realized in the merging unit DSP(Digital Signal Processor) is introduced for compensating the time-delay.The test shows its effectiveness.Potential problems in the program and their corresponding solutions are discussed.