自适应陷波器实际性能的理论分析及其在继电保护信号接收中的应用

Theoretical Analysis of Adaptive Notch and Its Application in Receiving Relay Protection Signals

首先通过理论分析发现了在精度有限的实际系统中影响自适应陷波器性能的因素，证明了将信号通过下变频，进行低频化处理的优越性．据此提出了将信号插入低频段后进行自适应陷波的低频化方案，并与在较高频直接进行自适应陷波的方案进行性能比较．计算机仿真和实际的硬件实验均说明，使用低频化方案可降低对芯片的速度要求，接收信号的幅度范围则扩大２５倍，允许的发信频率误差也提高约一倍．

The adaptive notch's performance is analyzed when it is used in a real system. It is discovered that there are several elements that effect its performance and the performance will be much better if the input signals are frequency down-converted and processed in low frequency. A low-frequency plan based on this result is presented. The comparison between the low-frequency and high-frequency plan is made by computer simulations and hardware experiments. It is shown that the low-frequency plan has a much better performance than the high-frequency plan: the speed request for iC chips can be lowered, the range of input signal's amplitude is 25 times larger and the tracking range of signal's frequency is larger than the high-frequency plan, too.