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电网信号     
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  power network signal
     Because it was unable to integrate in a full period, a remarkable error would appear in the calculation of dielectric dissipation factors of capacitance equipments by traditional finite time discrete correlation algorithm when the sampling frequency was not synchronous with power network signal’s frequency.
     由于不能在整周期区间内准确积分, 当采样频率与电网信号频率不同步时,采用有限时间离散相关函数法计算电容型设备的介质损耗因数(介损)会产生较大的误差。
短句来源
  electric power signal
     Analysis and Processing of Non-synchronous Sampling Errors in Measurement of Electric Power Signal
     电网信号测量中非同步采样误差的分析与处理
短句来源
  power network signals
     This paper introduces two methods for detecting harmonics in power network signals by means of wavelet transform (WT) and wavelet packet transform (WPT).
     针对常规快速傅立叶变换无法检测非整数次谐波,以及改进的加窗插值快速傅立叶变换运用困难,采用小波、小波包变换对电网信号中的谐波进行检测分析。
短句来源
     The classification of synchronous AC sampling technologies for power network signals is briefly introduced,and the emphasis is put on the analysis of the principle and error sources of SW synchronous sampling. The implementation of a SW synchronous sampling and data processing system based on DSP TMS320F 24X is presented,and the corresponding software design is put forward.
     简要介绍了电网信号交流采样的分类,重点分析了采用软件实现同步交流采样的工作原理和误差来源,并结合DSP技术给出一种基于TMS320F24X芯片的软件同步采样处理系统的实现方案,给出了软件设计流程。
短句来源
     Simulation result and that of measured signal show that using the proposed method the inter-harmonics near the integer harmonics can be detected under low noise level, the estimated integer harmonics and inter-harmonics possess higher accuracy and can meet the need of measuring accuracy of actual power network signals.
     仿真和实测信号分析结果表明,该间谐波参数估计方法在低噪声水平下可检测到整数次谐波附近的间谐波,且估计出的谐波和间谐波参数精度较高,能满足实际电网信号测试精度的要求。
短句来源
     Thispaper introduces two methods for detecting harmonics in power network signals bymeans of wavelet transform (WT) and wavelet packet transform (WPT).
     本文分别采用小波、小波包变换对电网信号中的谐波进行检测分析。
短句来源
     Applying this technology in measuring the power network signals of virtual value,power and harmonics and logging fault waves can lower the complexity of hardware while the measuring accuracy ensured.
     在测量电网信号的有效值、功率、高次谐波以及故障录波等方面使用该技术,可保证检测精度时同时减少硬件的复杂度。
短句来源
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  power system signals
     Research of Phase Difference Measurement for Power System Signals Based on Virtual Instrument
     基于虚拟仪器的电网信号相位差测量的研究
短句来源
     After have studied deeply in the FFT theory, the thesis gives an improved FFTalgorithm--half-wave symmetric FFT which is based on the half-wave symmetriccharacteristic of the power system signals.
     由于FFT是傅里叶变换得以广泛应用的前提,本文在深入分析FFT技术的基础上,针对电网信号具有半波对称性的特点,提出了一种改进的FFT算法——半波对称FFT算法。
短句来源
     Power system signals are simulated and calculated with this method, all kinds of windows have high accuracy for the frequency and magnitude, however, for the phase the result obtained by 4-term windows have notable error.
     用此法仿真计算电网信号的结果表明 :对于频率和幅值 ,各种窗具有很高的精度 ; 4项窗所得相位误差较大。
短句来源

 

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      power system signals
    Power system signals such as current and voltage have traditionally been analysed by the Fast Fourier Transform.
          
    The OS protection developed has been thoroughly tested with ATP-generated power system signals.
          
    The wavelet transform technique has been proposed in other publications to analyze power system signals.
          
    The nature of power system signals seems to point towards the convenience of using trigonomet ric-based wavelets.
          


    The source of the low-frequency conducteddisturbance in EMC field is introduced, such as harmonic,interharmonic, voltage dips, voltage fluctuations, shortinterruptions, unbalance, main signalling and frequencyvariations.The influence on the power quality of publicpower supply system is described, and the EMC level usedto improve power quality is recommended.

    分析讨论了谐波、谐间波、电压波动、电压暂降、短时中断、三相电压不平衡、电网信号和电源频率变化等低频传导电磁骚扰对公用供电系统电力质量的影响,提出了提高电力质量建议采用的电磁兼容水平值。

    Two new methods for power system signal detection are introduced to overcome the limitation of conventional techniques,which are based on cosine modulated filter bank with perfect reconstruction and compactly supported orthogonal wavelet packet transform.The new methods are compared with that of discrete Fourier transform.The results show that the CMFB and WPT signal detection techniques are more predominant over FFT at some aspects,such as resolution,leakage and transient.Referable theoretical bases are provided...

    Two new methods for power system signal detection are introduced to overcome the limitation of conventional techniques,which are based on cosine modulated filter bank with perfect reconstruction and compactly supported orthogonal wavelet packet transform.The new methods are compared with that of discrete Fourier transform.The results show that the CMFB and WPT signal detection techniques are more predominant over FFT at some aspects,such as resolution,leakage and transient.Referable theoretical bases are provided for accurate detection of power system signal.

    针对目前电网信号检测技术的局限性 ,介绍了基于完全重构余弦调制滤波器组及紧支撑正交小波包变换理论的电网信号检测方案 ,并将传统的基于离散Fourier变换的检测技术与这两种新方法作了比较 ,为电网信号的高分辨检测提供了可参考的理论依据

    A thorough research on the highaccuracy estimation for the electrical harmonic parameters by using the Interpolated FFT algorithm was conducted. The window size and the window type are the main factors influencing the analysis precision. Based on the features of the commonly used windows,a formula for the analysis precision in relation to the window size is given. Studies show that according to the power signal's characteristic that the fundamental amplitude is much higher than that of the harmonics Hanning...

    A thorough research on the highaccuracy estimation for the electrical harmonic parameters by using the Interpolated FFT algorithm was conducted. The window size and the window type are the main factors influencing the analysis precision. Based on the features of the commonly used windows,a formula for the analysis precision in relation to the window size is given. Studies show that according to the power signal's characteristic that the fundamental amplitude is much higher than that of the harmonics Hanning Window is more suitable for the analysis of electrical signals and the computing formula for the harmonic parameter estimation are given as well. Simulation result demonstrates that by using the results above the estimation of harmonic frequencies,amplitudes and phases reaches the expected precision.

    深入研究了插值快速傅里叶变换(FFT)算法在电网谐波参数估计中的应用.加窗宽度和窗函数的类型是影响插值FFT算法分析精度的主要因素.通过对常用窗函数的特性分析,得出了加窗宽度关于分析精度的估计公式.电网信号的基波幅值远大于各次谐波幅值,分析表明,Hanning窗比较适合分析电网信号,同时给出了基于Hanning窗的电网谐波幅值、频率和相位的显式计算公式.仿真结果证明,应用上述分析结果,电网谐波幅度、频率和相位的估计达到了预期的分析精度.

     
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