变频器综合测试平台的研发

发布时间：2018-03-30 18:01

本文选题：变频器　切入点：虚拟仪器技术　出处：《东北石油大学》2016年硕士论文

【摘要】：变频器是一种可进行变频调速控制的仪器,对于油田来说,其可以实现自动控制和节能减排。在油田生产中,变频器长期工作在野外,由于元器件老化、操作不当、环境干扰等情况发生时,变频器就会出现各种故障,结果会造成停产,为了能够解决这一问题,需要加强变频器维修,然而,维修基本手段依靠手工,利用万用表或是电压表、电流表、功率表检查测量,检测过程中,设备的连接,仪表的读数和记录都由人工完成,这种测试方法有着很大的缺陷,主要表现在以下几个方面:1.效率低,由于变频器故障检测,需要测试多个项目,而且有些项目需要同时测量,使用人工测试,会使许多数据,测试存在误差,影响变频器的故障定位。2.误差率高,要对大量元件测量、统计本来就有一定难度,再加上维修人员的熟练度不同或是人为疏忽,难免会有一些差错,而这些差错往往会做出错误的判断,判断错误不但影响维修时间,而且浪费人力物力,影响生产。3.检测仪表设备不统一,质量有好有次,精度等级不同,加上人为的原因产生误测,造成维修判断错误。为此,提出变频器综合测试的研究,并通过虚拟仪器技术及同轴互拖负载测试系统实现变频器的准确、快速地诊断。针对变频器故障的问题,我们分析故障原因,其中检测电路、整流滤波、电容、主回路、开关电源电路等故障较为常见。首先,基于变频器主回路硬件检测的基础,结合虚拟仪器技术,确定变频器静态检测的方法,以检测变频器主回路中整流、逆变电路的导通电流、导通电压、截止电压和漏电流。其次,研究同轴双向互拖技术,通过三项平均电流法和虚拟仪器技术的结合,测试变频器的动态性能,使其在不同负载下对变频器内性能故障(即多个开关管开路故障)均能有效定位,并根据测试需求设计线性可调的负载系统。最后,通过PLC和组态软件搭建变频器综合测试平台,以实现多数据实时采集、运算、处理的能力,使系统更加的平稳、准确。
[Abstract]:Frequency converter is a kind of instrument which can be controlled by frequency conversion. It can realize automatic control and energy saving and emission reduction for oil fields.In the oil field production, the inverter works in the field for a long time. When the components are aged, the operation is improper, and the environment interferes, the frequency converter will have a variety of faults, which will result in the shutdown. In order to solve this problem,Need to strengthen frequency converter maintenance, however, the basic means of maintenance rely on manual, using multimeter or voltmeter, ammeter, power meter check measurement, in the process of detection, equipment connection, meter reading and recording are all completed manually.This test method has a lot of defects, mainly in the following aspects: 1.Low efficiency, because of frequency converter fault detection, need to test many items, and some items need to be measured at the same time, the use of manual testing, will make a lot of data, test errors, affect the frequency converter fault location .2.The error rate is high, to measure a large number of components, statistics is already difficult, plus the maintenance staff of different proficiency or human negligence, there will inevitably be some errors, and these errors will often make a wrong judgment.Judgment errors not only affect maintenance time, but also waste manpower and material resources, affecting production. 3.The inspection instrument equipment is not uniform, the quality has the good, the precision grade is different, plus the artificial reason produces the wrong test, causes the maintenance judgment error.For this reason, the research of frequency converter comprehensive test is put forward, and the accurate and fast diagnosis of inverter is realized through virtual instrument technology and coaxial load test system.In view of the problems of frequency converter fault, we analyze the causes of the fault, among which the detection circuit, rectifier filter, capacitance, main circuit, switching power supply circuit and other faults are common.First of all, based on the basis of the hardware detection of the inverter main circuit, combined with the virtual instrument technology, the static detection method of the frequency converter is determined to detect the on-current and voltage of the rectifier and inverter circuit in the main circuit of the inverter.Cutoff voltage and leakage current.Secondly, the coaxial bidirectional towing technology is studied to test the dynamic performance of inverter through the combination of three average current methods and virtual instrument technology.It can effectively locate the internal performance faults (i.e., the open circuit faults of multiple switches) under different loads, and design a linear adjustable load system according to the test requirements.Finally, the comprehensive testing platform of frequency converter is built by PLC and configuration software to realize the ability of multi-data real-time acquisition, operation and processing, and make the system more stable and accurate.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE938

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