Analysis of Input Phase for PLL in Dynamic Environment

2014 ◽  
Vol 668-669 ◽  
pp. 669-672
Author(s):  
Yao Xuan Feng ◽  
Hai Bao
Keyword(s):  
Dynamic Condition ◽  
Electric Energy ◽  
Dynamic Environment ◽  
Analytical Description ◽  
Research Field ◽  
Operating Environment ◽  
Transform Method ◽  
Zero Crossing ◽  
Energy Metering ◽  
Input Equation

In dynamic operating environment, it is one of key issues in the research field of electric energy metering that the accuracy of synchronous sampling signal based on phase locked technology. Because operating environment changes from steady state to dynamic, analytical description of PLL input signal becomes an urgent problem to be solved. In this paper, dynamic signal is analyzed mathematically by using zero-crossing detection theory, its phase expression is obtained, then mathematical equivalent conversion is made based on operation characteristics of PLL, its phase input equation is obtained, finally the correctness of the input equation is verified by Fourier transform method. This study lays the foundation for error analysis of electric energy metering system under dynamic condition.

Analysis of the Energy Metering Problem in Dynamic Environment

2014 ◽  
Vol 668-669 ◽  
pp. 673-676
Author(s):  
Zhuo Wang ◽  
Hai Bao
Keyword(s):  
Steady State ◽  
Electric Power ◽  
Electric Energy ◽  
Dynamic Environment ◽  
First Order ◽  
Energy Metering ◽  
Analytic Expressions ◽  
Engineering Environment ◽  
Linear Elements ◽  
Power Metering

The traditional electric power metering theory is a kind of no-error metering theory in sinusoidal steady-state circuit. However, the applying condition is too rigor, and the engineering environment is hard to fulfil, the application premise should be extended to dynamic. Ideal linear elements are adopted to build a first-order dynamic circuit. And the analytic expressions of the capacitor cumulative electric energy in the charging process are derived theoretically. It points out that the cumulative electric energy of capacitor in dynamic circuit is a nonzero value. This fully demonstrates that the energy metering principle brings error when it is used in dynamic environment.

Analysis on the Condition of the Electric Energy Metering Device and the Strategy of Inspection

2013 ◽  
Vol 278-280 ◽  
pp. 1015-1021
Author(s):  
Ying Ying Cheng ◽  
Hua Xiao Yang ◽  
Ji Xiao
Keyword(s):  
Evaluation System ◽  
Working Condition ◽  
Electric Energy ◽  
The State ◽  
Operating Environment ◽  
State Evaluation ◽  
Condition Evaluation ◽  
Energy Metering ◽  
Power Frequency ◽  
Frequency Temperature

The article points out that it is necessary to apply condition evaluation and condition test to the electric energy metering equipment, based on the actual working condition of electric energy metering equipment. Then, the data of voltage, current, power, frequency, temperature, humidity and so on, are collected by the condition detection equipment of the electric energy metering equipment. Coupling with the errors come from the standard meter and the periodic test on the spot, this article takes the suitable data as parameters, and synthetically evaluates the influence of complicated grid operating environment on accuracy and reliability of energy metering equipment. The criteria which reflect the condition value of the electric energy metering equipment are analyzed to determine the weight of each criterion, to establish the condition evaluation criterion, and to form the condition evaluation system. According to the state evaluation results, different inspection strategies are proposed.

Research the Test Method of the Voltage Transformer Secondary Load in the Three-Phase Three-Wire Electric Energy Metering Device

2014 ◽  
Vol 687-691 ◽  
pp. 3110-3115
Author(s):  
Gu Li ◽  
Zi Ming Fu ◽  
Jie Feng Yan ◽  
Bing Wen Li ◽  
Zhi Rong Cen
Keyword(s):  
Power Supply System ◽  
Electric Energy ◽  
Test Methods ◽  
Test Method ◽  
Testing Methods ◽  
Voltage Transformer ◽  
Secondary Load ◽  
Three Phase ◽  
Energy Metering ◽  
Definition Of

This paper analyzes and studies the definition of the voltage transformer secondary load, examines the practical purposes of the measured values of the voltage transformer secondary load, and presents a variety of testing methods to analyze and compare the differences. This paper gives the test methods of the voltage transformer secondary load when the connection of the voltage transformer is the Y / Y in a three-phase three-wire power supply system, filling the blank of this type of test method in the industry. When other units within the industry carry out such work, the conclusions of this paper are available for reference, and the conclusions of this paper can be referred when drafting relevant regulations in the future.

scholarly journals Electrical Harmonic Energy Measurement Based on Wavelet Packet Decomposition and Reconstruction Algorithm

2021 ◽  
Author(s):  
Mengshuang Liu ◽  
Xudong Shi ◽  
Chen Yang
Keyword(s):  
Virtual Instrument ◽  
Reactive Power ◽  
Simulation Analysis ◽  
Wavelet Packet ◽  
Electric Energy ◽  
Reconstruction Algorithm ◽  
Energy Measurement ◽  
Fundamental Wave ◽  
Wavelet Packet Decomposition ◽  
Energy Metering

In order to study the accurate measurement of electric energy in complex industrial field, a method of harmonic electric energy measurement based on wavelet packet decomposition and reconstruction algorithm, as well as the calculation formula of harmonic power and the principle of harmonic electric energy measurement are proposed. Using db42 wavelet function to carry out harmonic energy metering simulation analysis, the results show that: The fundamental frequency of the simulation signal is 50 Hz, two-layer wavelet packet transform is adopted, the simulation input signals within 40 fundamental wave cycles are taken, and the sampling frequency fs is 800 Hz. Conclusion: The three-phase harmonic energy metering device based on virtual instrument technology has realized the measurement of each harmonic active power and reactive power, and the accuracy reaches 0.2 s.

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