共查询到18条相似文献,搜索用时 78 毫秒
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用基于全通滤波器的ⅡR陷波器抑制工频通信中的谐波干扰 总被引:5,自引:1,他引:5
针对双向工频通信的信号特征,为了解决IIR陷波滤波器系数在低频段敏感度高的问题,提出采用基于全通滤波器的IIR陷波滤波器来消除电网谐波干扰的新方法。该陷波器可以由格型运算结构来实现,并因为全通滤波器的分子与分母之间的镜像对称关系,使滤波器在低频段具有非常低的系数敏感度。该文详细论述了该陷波滤波器的基本原理和设计方法,并通过一个设计实例说明了该方式由于量化效应引起的频率偏移量要远远小于级联方式。现场实验与仿真都证明了该滤波器能够非常有效地抑制电网中的基波和3、5次谐波,大大提高了对双向工频通信信号的检测能力。 相似文献
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自适应陷波滤波器在异步电动机故障诊断中的应用 总被引:1,自引:0,他引:1
本文应用自适应陷波滤波器对异步电动机定子电流信号进行处理,其结果有利于转子故障特征的提取。实测结果表明,这种方法可以提高故障诊断的灵敏度。 相似文献
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为了抑制LCL滤波器的谐振,提高光伏并网逆变器的输出性能,介绍了一种基于陷波校正法的光伏并网逆变器输出滤波控制方案,将陷波校正法和超前/滞后环节引入LCL滤波器,给出了LCL滤波器的设计参数。系统仿真和实验结果表明,这种滤波方案有效抵消了LCL滤波器的正谐振峰,有效地滤除了逆变器输出电流的高次谐波,改善了电流波形的质量,提高了光伏并网逆变器的输出效率。 相似文献
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分析传动系统中谐振发生的原因,指出解决方法.给出一种陷波滤波器的结构,推导出其传递函数,并对相应的结构作了仿真试验.仿真结果表明,陷波滤波器对滤除信号中的某个指定频率的分量非常有效,但陷波滤波器的引入对传动系统也有一定的负面影响.最后介绍现场实际使用情况及效果. 相似文献
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鉴于IIR数字滤波器设计本质上是一个多参数非线性复杂函数优化问题,提出应用具有全局搜索能力强,收敛速度快特点的克隆选择算法优化IIR数字滤波器的相关参数,进而形成一种新的IIR数字滤波器优化设计方法。给出了IIR滤波器优化设计的数学模型,描述了应用克隆选择算法优化设计IIR数字滤波器的具体实现步骤,并通过低通和高通IIR数字滤波器设计的仿真结果表明该方法的有效性和高效性。 相似文献
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介绍了IIR数字滤波器的特点及模型.在MATLAB环境下用fdatool工具以及程序2种方法设计lIR滤波器系数,并编写IIR.m程序实现IIR滤波器功能.以实际混频信号为例实现IIR滤波器的仿真,最后利用MATLAB工具系统函数验证了自行设计的IIR.m程序的正确性.研究结果表明,自行设计的IIR.m程序能达到与MA... 相似文献
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Y. V. Joshi S. C. Dutta Roy 《International Journal of Circuit Theory and Applications》1998,26(5):499-507
A new method for designing IIR multiple notch filters is presented, which satisfies the notch frequency specifications exactly and realizes 3 dB rejection bandwidths which are lower than those specified. An allpass filter-based realization has been worked out to make the design relatively insensitive to coefficient inaccuracies. Illustrative examples are given. © 1998 John Wiley & Sons, Ltd. 相似文献
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J. Cousseau P. S. R. Diniz G. Sentoni O. Agamennoni 《International Journal of Circuit Theory and Applications》2000,28(5):481-500
Convergence speed is one of the main concerns in adaptive IIR filters. Fast convergence can be closely related to adaptive filter realization. However, with the exception of the lattice realization that is based on the nice properties of Szëgo orthonormal polynomials, no other adaptive IIR filter realization using orthonormal characteristics seems to be extensively studied in the literature. Furthermore, many orthogonal realizations for adaptive FIR filters, that are particularly suitable for rational modelling, have been proposed in the past years. Since rational orthogonal basis functions are a powerful tool for efficient system representation they seem attractive for adaptive IIR filters. In this paper, we present some theoretical results related to the properties of a generalized orthonormal realization when used for mean‐square output error minimization in a system identification application. One result is related to the low computational complexity of the updating gradient algorithm when some properties of the orthonormal realization are used. An additional result establishes conditions for the stationary points of the proposed updating algorithm. In order to confirm the expected performance of the new realization, some simulations and comparisons with competing realizations in terms of computational complexity and convergence speed are presented. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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N. A. El-Gayed M. Abdel-Rahman M. F. Fahmy 《International Journal of Circuit Theory and Applications》1998,26(5):453-462
A simple rapidly convergent method is described for the design of two-channel IIR perfect reconstruction quadrature mirror filters. For any prescribed characteristic, it has been shown how one can construct a stable two-channel IIR banks, starting from any random transmission zero locations. A simple rapidly convergent search algorithm is also described for the determination of the exact locations of these transmission zeros, such that the filter has equiripple pass and stop responses as well as almost constant group delay. Illustrative examples are also given to show that the proposed design method competes very well with the existing design methods. © 1998 John Wiley & Sons, Ltd. 相似文献
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