| This thesis develops the electric parameter monitoring device that is based on TMS320C5402. This device is the further research and improvement production on the base of the primary device which measures the electric parameter much more quickly and correctly than the primary device. The device may perform real-time measuring of frequency, effective value of voltage and current ,power ,from the third to twentieth harmonic wave ,etc and is departed into two parts. one is responsible of sampling and calculating data, the other LCD displaying and controlling by the key-press. This thesis mainly discusses the first part.Firstly, the thesis puts forward the importance of measuring electric parameter ,then presents the problem and harm of harmonic in power system and discusses several kinds of general analysis methods used in power system harmonic Secondly, the factors in FFT that cause synchronous errors by the synchronization sampling are analyzed. by comparing several normal windows ,we select hanning window to reduce the leakage effect and sample data by circuit of frequency multiplication phase-locked .finally to limit the picket fence effect the interpolating algorithm is presented. Based on TMS320C5402,we designed the hardware part including data-collecting unit -the use of AD73360,design of the extending flash, communication with MSP430F149 using HPI etc ,also designed software part of the equipment system consisted of bootloader function and the interface with other equipment. |
