电能质量全指标监测系统的研究与应用

发布时间：2018-07-02 09:37

本文选题：电能质量分析仪 + 监测系统　；参考：《安徽大学》2017年硕士论文

【摘要】：随着国民经济不断发展和科学技术的日新月异,21世纪我国电力系统的电网特性、负荷构成和调控技术正在发生巨大的变化,各类电能质量问题层出不穷。国家智能电网战略在此背景下应运而生,而在智能电网体系里,家庭用户端用电信息及电能质量数据的采集是最基础的环节。传统的电能质量分析仪器有价格昂贵,精度低下,不够便携等缺点,且大多数监测仪器无法检测暂态扰动现象或检测效果低下。因此,在保证测量精度的基础上研究出一种便携化、低成本、全指标、高智能的电能质量监测系统具有重要的意义。本课题是基于上述背景,介绍了电能质量稳态参数的测量结构及分析方法,改进了对电网频率的测量,并对在IEC 61000-4-30:2015标准上新出现的但国标中没有定义的快速电压变动RVC现象及其测量方法做了简介,详述了 ClassA、S及B类测量集合(累积时间)间隔同步的方法及谐波聚集算法。随后,在暂态电能质量扰动现象的检测分析中介绍了 HHT算法并对其提出改进,避免了端点效应的同时还保证了测量的准确度,最后对典型的扰动现象建立模型并仿真验证其有效性。接着构建了以DSP28335为主控芯片的软硬件设计方案,确定了软硬件实施流程架构。硬件设计包括电源模块、信号采集模块、主控模块、存储模块,电路设计兼顾抗干扰设计,同时针对变采样率方案的设计了抗混叠滤波器。软件设计包括DSP主程序,频率测量、A/D采样及DMA传输、复序列的FFT数据处理程序及功率计算程序,并对暂态扰动现象进行定位记录。同时,嵌入蓝牙模块通过通信程序与手机端进行通讯,实现远程了解用电设备的电能质量。最后通过对某逆变器输出电压的数据分析测试了仪器性能,发现了实际应用过程中存在的采样率和抗混叠滤波器的匹配问题,通过对另一个电弧炉测试案例的数据分析,验证了本监测系统达到了最初制定的便携化、低成本、全指标、高智能要求,但监测系统仍有一定的改进空间。
[Abstract]:With the continuous development of the national economy and the rapid development of science and technology, the power network characteristics of China's power system in the 21st century, load composition and control technology is undergoing tremendous changes, various kinds of power quality problems emerge in endlessly. The national smart grid strategy emerges as the times require in this context, and in the smart grid system, the acquisition of household consumer power information and power quality data is the most basic link. The traditional power quality analysis instruments have the disadvantages of high price, low precision and not portable enough, and most of the monitoring instruments can not detect the transient disturbance phenomenon or the detection effect is low. Therefore, it is of great significance to develop a portable, low cost, full index and high intelligence power quality monitoring system based on the measurement accuracy. Based on the above background, this paper introduces the measurement structure and analysis method of power quality steady-state parameters, and improves the measurement of power network frequency. The RVC phenomenon of fast voltage change and its measuring method which appeared in IEC 61000-4-30: 2015 standard but not defined in national standard are introduced in this paper. The method of synchronizing the interval between ClassANs and class B measurement sets and the algorithm of harmonic aggregation are described in detail. Then, the HHT algorithm is introduced and improved in the detection and analysis of transient power quality disturbances, which avoids the endpoint effect and ensures the accuracy of measurement. Finally, the model of the typical disturbance phenomenon is established and its effectiveness is verified by simulation. Then, the hardware and software design scheme based on DSP 28335 is constructed, and the hardware and software implementation flow structure is determined. Hardware design includes power supply module, signal acquisition module, main control module, storage module, circuit design and anti-jamming design. At the same time, anti-aliasing filter is designed for variable sampling rate scheme. The software design includes the main program of DSP, sampling and DMA transmission of A / D frequency measurement system, FFT data processing program and power calculation program of complex sequence, and recording of transient disturbance phenomenon. At the same time, the embedded Bluetooth module communicates with the mobile phone through the communication program to realize the remote understanding of the power quality of the electric equipment. Finally, the instrument performance is tested by analyzing the output voltage data of a certain inverter, and the problems of sampling rate and anti-aliasing filter matching in practical application are found, and the data of another arc furnace test case are analyzed. It is verified that the monitoring system has achieved the requirements of portability, low cost, full index and high intelligence, but there is still some room for improvement.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM76

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