Study On Pre-process For Online Monitor Signal Of Partial Discharge Based On Embedded Techonolgy

Nowadays Partial Discharge (PD) Online Monitoring has become a hot hit in research on safe operation of large electrical equipments, because it can supervise their working condition and also provide reliable reference data for accidental alarm. However, there are two defects in present PD online monitoring scheme, which are listed as following: 1. since the attenuation and disturbance of analog transfer channel, recognition of PD would become more difficult; 2. since lots of data, transfer channel would become over-burden and system would become slow echo. Based on studying and analyzing of time and frequency domain characteristic of PD signal and noise signal, author deduce the algorithm for recognition and elimination of noise signal, and then advanced a novel PD Online Monitoring scheme, which is based on adding a remote data collection and pre-process module (slave machine), to improve accuracy and real-time of system.This thesis focused on study and design of slave machine, which includes three key technology points as following:1. Study of optimization in embedded system design: According to software-hardware (S/W) co-design theory, the author separated S/W process of data pre-process algorithm in slave machine effectually and using S/W co-design to make process speed of key algorithm more fast. On FPGA platform, accomplished the design and simulation of FIR digital filter and FFT calculation, FIFO & controller module and then compared it with what is design purely of software in several platforms. Research proved that S/W co-design could improve its process speed, based on adding more design complexities.2. Study on embedded communication technology: According to embedded TCP/IP protocol, author realized the protocol and packaged the API function. Based on these, TCP Server/Client mixed mode has been designed. Research demonstrated that embedded TCP/IP protocol provides a good communication scheme for embedded system.3. Study on embedded storage technology: According to ATA protocol, author realized main function of it and tested its working characteristic of all modes. And some key experience of design and debug also has been presented. Research proved that ATA provide a good storage technology for embedded system.