The Analysis of Rogowski Coil Transfer Characteristics in the Composite Frequency Environment

2013 ◽  
Vol 816-817 ◽  
pp. 450-453
Author(s):  
Hai Bao ◽  
Xin Yuan Guo ◽  
Ling Wang ◽  
Gang Liu
Keyword(s):  
Frequency Characteristic ◽  
Rogowski Coil ◽  
Frequency Characteristics ◽  
Reference Standard ◽  
Frequency Signal ◽  
Transfer Ratio ◽  
Transfer Characteristics ◽  
Simulation Results ◽  
Secondary Side

This article uses the method of frequency characteristic to analysis transfer characteristics of Rogowski coil. In the case of the composite frequency signal, Rogowski coil transfer ratio is the function of frequency, that is the transfer ratio varies with the frequency, which makes the signal of the secondary side not restore to the primary side. The simulation results prove the conclusion. In view of the situation, this paper presents an ideal transfer ratio, which provides the reference standard for correcting the frequency characteristics of the Rogowski coil integrating circuit.

Design Technique of High Power Efficiency LLC DC-DC Converters for Photovoltaic Cells

2018 ◽  
Vol 2 (1) ◽  
pp. 30
Author(s):  
Hisatsugu Kato ◽  
Yoichi Ishizuka ◽  
Kohei Ueda ◽  
Shotaro Karasuyama ◽  
Atsushi Ogasahara
Keyword(s):  
High Power ◽  
Power Efficiency ◽  
Photovoltaic Cells ◽  
Input Voltage ◽  
Design Technique ◽  
Load Range ◽  
Voltage Range ◽  
Simulation Results ◽  
Secondary Side ◽  
High Power Efficiency

This paper proposes a design technique of high power efficiency LLC DC-DC Converters for Photovoltaic Cells. The secondary side circuit and transformer fabrication of proposed circuit are optimized for overcoming the disadvantage of limited input voltage range and, realizing high power efficiency over a wide load range of LLC DC-DC converters. The optimized technique is described with theoretically and with simulation results. Some experimental results have been obtained with the prototype circuit designed for the 80 - 400 V input voltage range. The maximum power efficiency is 98 %.

Parameter Estimation of Low-Frequency Signal with Negative Frequency Contribution

2013 ◽  
Vol 380-384 ◽  
pp. 3457-3460 ◽  
Author(s):  
Si Wei Tan ◽  
Zhi Liang Ren ◽  
Jiong Sun
Keyword(s):  
Parameter Estimation ◽  
Phase Difference ◽  
Spectrum Analysis ◽  
Low Frequency ◽  
High Accuracy ◽  
Signal Parameter ◽  
Frequency Signal ◽  
Spectrum Method ◽  
Analysis Theory ◽  
Simulation Results

According to the problem that there is a decline in accuracy of low-frequency signal parameter estimation by using the algorithm of all-phase FFT, an improved phase difference correcting spectrum method based on all-phase FFT is proposed. The contribution of negative frequency to FFT calculation was considered while using phase difference correcting spectrum method. The all-phase FFT spectrum analysis theory was presented as well as a traditional phase difference correcting method based on it. The equations of parameter estimation such as frequency, amplitude and phase for low-frequency signals were derived with the negative frequency contribution to spectrum analysis. The simulation results show that the method proposed in this paper can be used to estimate the parameters of low-frequency signals in a high accuracy, and also achieves an improvement in anti-noise ability.

The Distortion Analysis and Restraint of Dual-Frequency Modulation Signals

2013 ◽  
Vol 380-384 ◽  
pp. 3599-3603
Author(s):  
Yang Zhang ◽  
Song Bai Hu ◽  
Shi Hong Liu
Keyword(s):  
The Self ◽  
Far Field ◽  
Square Root ◽  
Dual Frequency ◽  
Frequency Signal ◽  
Distortion Analysis ◽  
Signal Input ◽  
Acoustic Array ◽  
Simulation Results ◽  
Square Root Method

According to the parametric acoustic array theory and Berktay far-field solution, analyze the self-demodulation distortion theory of the DSB method and the square root method with the dual-frequency signal input and present the distortion calculating formulas. Bring forward an adapting modulation algorithm, which can restrain over modulation effectively. Compared with theoretical analysis, the simulation results of MATLAB are satisfactory.

A Novel Method for Online Measuring the Short-Circuit Impedance of Distribution Transformers

2011 ◽  
Vol 301-303 ◽  
pp. 1072-1077
Author(s):  
Xia Li ◽  
Min You Chen ◽  
Shan Cheng
Keyword(s):  
Short Circuit ◽  
Equivalent Circuit Model ◽  
Current Data ◽  
The Novel ◽  
Distribution Transformers ◽  
Novel Method ◽  
Simulation Results ◽  
Data Acquisition Unit ◽  
Secondary Side ◽  
Circuit Impedance

The paper proposes a novel method for online measuring the short-circuit impendence of the distribution transformers (DT). The relation expression of the short-circuit impedance with respect to the voltage and current of the primary and secondary side has been developed through the analysis of the equivalent circuit model of a transformer, in which the voltage and current of the DT is collected by 12-channel-data-acquisition unit. And the online SCI is computed by fitting the obtained voltage and current data. The simulation results and comparison illustrated that the proposed method is simpler and more efficient with high accuracy. Besides, the proposed method integrates the linear fitting technique. The simulation results based on Matlab/smulink verified the feasibility and effectiveness of the novel method for online measuring the short-circuit impendence of the DT.

scholarly journals Simulation of an Adaptive Method of Improving the Accuracy and Extending the Range of Frequency Signal Processing in a Frequency-to-Code Converter

2021 ◽  
Vol 11 (21) ◽  
pp. 10341
Author(s):  
Piotr Warda
Keyword(s):  
Signal Processing ◽  
Adaptive Method ◽  
Variable Frequency ◽  
Frequency Change ◽  
Clock Signal ◽  
Frequency Signal ◽  
Frequency Selection ◽  
Processing Error ◽  
Simulation Results ◽  
Selection Of

The article discusses the modification of one of the basic methods of converting successive periods of a variable frequency signal into numerical values representing them. The method performs the adaptive frequency selection of the clock signal in the system processing the consecutive periods of input signal. The signal processing error is analyzed on an ongoing basis, and the frequency change factor is selected. Algorithms describing the operation of the method are included. The program of the simulator of the measurement channel operation with a frequency carrier of information is described, which allows for the verification of the proposed method. Examples of the simulation results are included.

A Method for Weak Multi-Frequency Signal Feature Extraction Based on Chaotic Duffing Oscillator

2014 ◽  
Vol 568-570 ◽  
pp. 155-161
Author(s):  
Heng Zhi Lu ◽  
Zhi Hui Lai ◽  
Tai Hu Wu
Keyword(s):  
Signal Detection ◽  
Initial Phase ◽  
Detection Method ◽  
Duffing Oscillator ◽  
Frequency Characteristics ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Frequency Signal ◽  
Preprocessing Method ◽  
Novel Method

In this paper, we study the scale-transformation weak signal detection method based on chaotic Duffing oscillator. Based on this, the frequency characteristics of the weak single-frequency signal with arbitrary frequency and initial phase can be extracted. Furthermore, we propose a signal frequency interception preprocessing method for analyzing weak multi-frequency signal. After combing the preprocessing method with the weak signal detection method based on chaotic Duffing oscillator, we further propose a novel detection method for weak multi-frequency signal. Based on this novel method, we can extract the frequency characteristics and initial phase characteristics of the weak multi-frequency signal. In this research, we also study the automatic detection of unknown multi-frequency signal. According to the numerical simulation, the novel method we propose in this paper is helpful to extract the frequency parameters and initial phase information of each signal component of the weak multi-frequency signal.

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