The Development Of The Grid Fault Recorders Based On DSP&FPGA

With the increasing demand for electricity, The grid in our country is graduallydeveloping toward to the widespread, complex, cyber and intelligent direction.Businesses and people’s requirements for power quality are also getting higher andhigher, therefore, there has an important significance to assure the Grid normal andsafety. Fault recorder as a fault recoed device, it is not only an important tool formonitoring the power grid, but also an important basis of evaluating the operationof relay protection devices and analysising the cause of fault natures.It plays animportant role to the Grid safety and power quality.Through the analysis of domestic and foreign research situation andperformance of existing products, this paper describes the development trend offault recorders.This paper constructs a new type of fault recorder based on DSP&FPGA which meets performance requirements of fault recorders, in allusion to theshortcomings and deficiencies of low sampling rates, poor data analysis, smallstorage capacities etc, which exist in current products. The system realizes thehigh speed data acquisition and processing, as well as high capacity data storageand transmission based on DSP&FPGA by designing hardware and softwaresystems.This paper detailed elaborates the hardware and software implementationprocess. Hardware includes the design of data acquisition, data caching, dataanalysis,data storage, data communication interface and power. Software includesthe design of DSP based reading data caching, achieving start up criterion, devisingthe communication interface and FPGA based the entire logic control,while mainlyachieves the AD converter sampling control and data caching logic.According to the above hardware and software design, this paper hascompleted the fault recorder overall system design and debugging. In this paper, thehardware physical map is presented, and the system has been debugged whichcombining hardware and software. The overall system has been tested with thecorresponding test data and waveforms.By the analysis of test data and waveforms,and comparison with the actual dataand waveforms, the system is able to achieve high speed data acquisition and processing, high capacity data storage and transmission functions. Therefore, thesystem satisfies the design requirements and performance indicators of the faultrecorder.