| 频率大范围变换下的电能计量 |
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| 引用本文： | 徐惜琼,竺红卫. 频率大范围变换下的电能计量[J]. 机电工程, 2012, 29(5): 568-571 |
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| 作者姓名： | 徐惜琼 竺红卫 |
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| 作者单位： | 浙江大学超大规模集成电路设计研究所,浙江杭州,310027 |
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| 摘 要： | 针对在频率不断变换的情况下对信号功率进行测量的问题,提出了一种可同时测量信号瞬时频率、基波有功功率和视在功率的算法。输入信号为已经滤除了直流和高次谐波的基波分量,通过自适应有限长单位冲击响应(FIR)数字滤波器测量了基波有功功率,通过Prony算法测量了信号的瞬时频率和视在功率,利用改进的最小加权二乘法(WLS)算法提高了功率的精确度。研究结果表明,在频率大量变化的情况下,该算法对信号频率、有功功率以及视在功率的测量的精确度可满足工程应用的需要。
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| 关 键 词： | 自适应有限脉冲响应滤波器 视在功率 有功功率 基波 Prony算法 最小加权二乘法 |
Power measurement under wide-range frequency deviations |
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| XV Xi-qiong , ZHU Hong-wei. Power measurement under wide-range frequency deviations[J]. Mechanical & Electrical Engineering Magazine, 2012, 29(5): 568-571 |
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| Authors: | XV Xi-qiong ZHU Hong-wei |
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| Affiliation: | (Institute of Very Large Scale Integrate Circuit Design,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | Aiming at the power measurement under wide-range frequency deviations,a simple algorithm for measurement of the frequency and both the fundamental active and apparent power of a power system was presented.The input voltage and current signals were filtered to be fundamental components and the noise effects were minimized,adaptive finite-impulse-response（FIR） filters were used to measure fundamental active power,Prony-based algorithm was carried out to measure the frequency and fundamental apparent power.Weighted-least-square（WLS）algorithm was employed to improve the precision of both the fundamental active and apparent power.The results indicate that the measurement with proposed algorithm has a high accuracy over a wide range of frequency changes.Thus,the proposed algorithm really meets the needs of online applications. |
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| Keywords: | adaptive finite-impulse-response（FIR） filters apparent power active power fundamental wave Prony-based algorithm weighted-least-square（WLS） |
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