基于CC430单片机的故障指示器设计研究
发布时间：2019-07-09 07:34
【摘要】：故障指示器是电力部门查找配电线路故障的重要工具之一。由于其价格低廉、安装方便灵活,无需停电装卸,加之目前很多产品将短路检测功能与接地检测功能合在一起,更加方便了用户查找短路和接地两种故障,在市场上颇受欢迎。但是故障检测准确率以及系统功耗一直是其主要难题。 本文介绍了基于CC430单片机系统的故障指示器设计方案,该指示器能准确指示故障类型和故障地点,并可将故障情况通过无线通信模块发送到监测中心,便于对电网进行控制。CC430单片机的引入,简化了故障指示器的硬件电路,加之该单片机具有超低功耗的特性,使得整个系统可在线路无故障时超低功耗运行。本方案选用了集成有CC1101无线射频模块的CC430f5137型号单片机,节约了设计成本,提高了系统的集成度。针对故障检测准确率问题,选取了一组较为合理的故障指示判据。同时提出了基于小波变换和傅里叶变换的改进的电网电流谐波幅值提取方法,两阶段法。两阶段法将谐波幅值提取过程分为两个阶段,第一阶段通过小波变换剥离采样信号中的非稳态分量,第二阶段使用加窗傅里叶变换求得各次谐波幅值。通过对小波变换、加窗傅里叶变换以及两阶段法进行仿真研究,可知两阶段法提取谐波幅值具有更高精度。 本文设计新型故障指示器具有体积小,重量轻,报警清晰,使用寿命长,成本低、免维护以及具有“遥信”功能等特点。
[Abstract]:Fault indicator is one of the important tools for power departments to find distribution line faults. Because of its low price, convenient and flexible installation, no power outage loading and unloading, in addition, many products combine short circuit detection function with grounding detection function, which makes it more convenient for users to find short circuit and grounding faults, which is very popular in the market. However, the accuracy of fault detection and the power consumption of the system have always been the main problems. This paper introduces the design scheme of fault indicator based on CC430 single chip microcomputer system. The indicator can accurately indicate the fault type and fault location, and can send the fault situation to the monitoring center through wireless communication module, which is convenient to control the power grid. CC430 single chip microcomputer simplifies the hardware circuit of the fault indicator, in addition, the single chip microcomputer has the characteristics of ultra-low power consumption. So that the whole system can run at ultra-low power consumption when the line is fault-free. In this scheme, the CC430f5137 model single chip microcomputer integrated with CC1101 radio frequency module is selected, which saves the design cost and improves the integration of the system. In order to solve the problem of fault detection accuracy, a set of reasonable fault indication criteria is selected. At the same time, an improved current harmonic amplitude extraction method based on wavelet transform and Fourier transform is proposed, which is a two-stage method. The process of harmonic amplitude extraction is divided into two stages by two-stage method. In the first stage, the unstable components in the sampled signal are stripped by wavelet transform, and in the second stage, the windowed Fourier transform is used to obtain the amplitude of each harmonic. Through the simulation of wavelet transform, windowed Fourier transform and two-stage method, it can be seen that the two-stage method has higher accuracy in extracting harmonic amplitude. In this paper, a new fault indicator is designed, which has the characteristics of small volume, light weight, clear alarm, long service life, low cost, no maintenance and "remote signal" function.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TM755;TP368.12
本文编号：2511977
[Abstract]:Fault indicator is one of the important tools for power departments to find distribution line faults. Because of its low price, convenient and flexible installation, no power outage loading and unloading, in addition, many products combine short circuit detection function with grounding detection function, which makes it more convenient for users to find short circuit and grounding faults, which is very popular in the market. However, the accuracy of fault detection and the power consumption of the system have always been the main problems. This paper introduces the design scheme of fault indicator based on CC430 single chip microcomputer system. The indicator can accurately indicate the fault type and fault location, and can send the fault situation to the monitoring center through wireless communication module, which is convenient to control the power grid. CC430 single chip microcomputer simplifies the hardware circuit of the fault indicator, in addition, the single chip microcomputer has the characteristics of ultra-low power consumption. So that the whole system can run at ultra-low power consumption when the line is fault-free. In this scheme, the CC430f5137 model single chip microcomputer integrated with CC1101 radio frequency module is selected, which saves the design cost and improves the integration of the system. In order to solve the problem of fault detection accuracy, a set of reasonable fault indication criteria is selected. At the same time, an improved current harmonic amplitude extraction method based on wavelet transform and Fourier transform is proposed, which is a two-stage method. The process of harmonic amplitude extraction is divided into two stages by two-stage method. In the first stage, the unstable components in the sampled signal are stripped by wavelet transform, and in the second stage, the windowed Fourier transform is used to obtain the amplitude of each harmonic. Through the simulation of wavelet transform, windowed Fourier transform and two-stage method, it can be seen that the two-stage method has higher accuracy in extracting harmonic amplitude. In this paper, a new fault indicator is designed, which has the characteristics of small volume, light weight, clear alarm, long service life, low cost, no maintenance and "remote signal" function.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TM755;TP368.12
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