影响数字式关口电能表计量性能的主要因素研究

发布时间：2018-08-19 16:51

【摘要】：如今,随着智能电网技术的发展,对电能计量提出了更严格的标准,此外,电能计量准确性与用户、电厂和供电局的经济利益息息相关,更加精确和公平的计量显得尤为重要,而目前对数字式关口电能表计量性能的影响因素的研究还比较少。因此,影响数字式关口电能表计量性能的因素研究对提高电能计量的准确性具有很强的现实意义。本文的主要研究工作如下:(1)研究了数字化电能计量体系的结构及数字电能计量体系中影响计量精度的误差源,并分析了数字式关口电能表结构及原理,剖析了数字式关口电能表计量性能影响因素。(2)研究了数据丢帧、频谱泄露、栅栏效应、AD量化和有限字长效应、谐波及不同电能积分算法所引起的电能表计量相对误差,并进行了仿真分析。(3)在Simulink平台上构建了三相制电能表的计量模型,通过计量模型分别对AD量化、梯形积分、谐波和三者共同作用所导致的电能表计量相对误差进行验证分析。结果表明,AD采样频率越大,影响因素所导致的相对误差越小;功率因素越大,影响因素所导致的相对误差越小,并且各个影响因素作用相互独立。(4)利用功率源、标准模拟表、电压转换装置、电流转换装置、数据采集装置、数字标准源、数字关口表、误差分析装置和上位机,搭建了一套数字化电能计量仪器溯源系统,在不同功率因数和负载电流条件下,通过模拟标准表输出电脉冲和关口电能表输出的光脉冲进行实验测试,通过测试的数据,在《测量不确定度评定与表示》指导下对数字式关口电能表进行不确定度评定。
[Abstract]:Nowadays, with the development of smart grid technology, more strict standards have been put forward for energy measurement. In addition, the accuracy of energy measurement is closely related to the economic interests of users, power plants and power supply bureaus, and more accurate and fair measurement is particularly important. At present, there are few researches on the influencing factors of digital gate watt-hour meter. Therefore, the research on the factors influencing the measurement performance of digital gate watt-hour meter has a strong practical significance to improve the accuracy of electric energy measurement. The main research work of this paper is as follows: (1) the structure of digital electric energy metering system and the error source of digital electric energy metering system are studied, and the structure and principle of digital gate watt-hour meter are analyzed. The factors affecting the metering performance of digital gate watt-hour meter are analyzed. (2) the relative error caused by data loss, spectrum leakage, fencing effect and finite word length effect, harmonics and different electric energy integration algorithms are studied. (3) the measurement model of three-phase watt-hour meter is constructed on Simulink platform, and the relative error caused by AD quantization, trapezoidal integral, harmonics and the interaction of the three factors are verified and analyzed by the metrological model. The results show that the larger the sampling frequency of AD, the smaller the relative error caused by the influencing factors, the smaller the relative error caused by the power factor, the smaller the relative error caused by the influencing factors. (4) using the power source, the standard analogue table. Voltage conversion device, current conversion device, data acquisition device, digital standard source, digital gate meter, error analysis device and upper computer, a set of digital power metering instrument traceability system is built. Under the condition of different power factor and load current, the output electric pulse of standard meter and the light pulse of gate electric energy meter are simulated, and the test data are obtained. Under the guidance of "Evaluation and representation of Measurement uncertainty", the uncertainty of digital gate watt-hour meter is evaluated.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM933.4

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