Research Of Storage And Data Processing Technology In Embedded Fault Recorder

The fault recorder, to be called "the black box" in electrical system, is the essential automatic equipment in electrical supervising. When the electrical system breaks down, this device can record the system condition and operational factor automatically, to provide the important basis for fault diagnosis and investigation. Nowadays, the most of fault recorder in electrical system are the "computer structure", and although they have been mended since 1980s, their whole configuration still remains. Along with the plan of "Strengthening Smart Grid" proposed by the State Grid Corporation of China in 2009, the building of the domestic smart grid has already begun. The year of 2009 and 2010 is the stage of attempting, but the constructing of the smart grid has very developed. It is estimated that in the future ten years smart grid will make great progress and it will get the important opportunity for the renewal of electrical system and equipment. As a kind of necessary electrical monitoring equipment, fault recorder will face more demand and its technological innovation will be more imperative as well.The embedded technology is on the rise, and the continuous improving of the microelectronic technology and chip's performance brings the opportunity and the dawn to the innovative design in fault recorder. The higher sampling speed and the higher sampling precision can keep more information during the period of fault happening, which is the goal of improving the device of fault recorder. The application of small scale monitoring equipment and industry electricity scene monitor also need the portable fault recorder. Based on the research of domestic and oversea fault recorder, the article thinks that we will have real portable fault recorder only if we break through the "computer structure". This paper proposed the design approach of "the portable fault recorder based on embedded technology". Through putting the sole FPGA chip introduce the device of fault recorder, it gives up the "multilayer structure", and uses the sole FPGA chip and CPU to finish control function instead. This kind of fault recorder can work without computer, and it is small scale and light weight, therefore it makes progress in the innovation of structure, performance and technology.This paper divided fault recorder's major function into three parts:the module of control harmonizing, the module of the data acquisition and the module of the data processing, introduce the concrete realization of the latter two, which correspond respectively to chapter 2 and chapter 3. In the module of the data acquisition, discussed the part of analog/switch acquisition, frequency measurement, data storage, clock system and so on. In the module of the data processing, discussed the part of start-up criterion, the part of parameter calculation, the part of harmonic analysis and the design of digital filter. Above of each function has passed through the experimental validating and has been realized basically, the debugging results is introduced in chapter 4. The research and design of portable fault recorder based on embedded technology, makes the gradual progress. In the end, in chapter 5, the paper summarizes all of the ideas and proposes the further corrective measure based on the finished designing.