The Design Of Power Parameters Tester

Power industry is one of basic industry of national economic development. However, with the influx of a large number of nonlinear load s in the power grid and the widespread use of new energy sources, power pollution becomes more and more serious. Therefore, in order to solve the problem of power quality, it is necessary to further improve the quality of electric energy by monitoring and analyzing p ower quality.On the basis of the existing power quality analyzer developed by our lab and the market requirement, the thesis designs a power parameters tester based on ADC+DSP+ARM by adding power parameters and updating the management system. Firstly, the author develops the interpolated FFT improved harmonic algorithm based on Kaiser-Nuttall(K-N) mutual-convolution window in order to get the accurate harmonic estimated value; secondly, for the sake of acquiring the dielectric loss angle(DLA), the thesis develops the fast DLA measurement algorithm based on time-domain quasi-synchronous; lastly, the hardware and software of management system of power parameters tester based on the embedded core(Cortex-M4) chip and the embedded system MQX is designed.In this thesis, the design consists of 6 parts. The first chapter is the introduction, which briefly introduces the research background, the significance of the project, the quality of electric energy, the definition of the relevant national standards, the dielectric loss parameter concept, the classification of power quality problems, power quality detection technology research status and development trend, the main work in this thesis and the source of the research project. The second chapter introduces the measurement algorithm of power parameters. The details introduces the improved spectrum line interpolation improved harmonic analysis algorithm FFT, which is based on the K-N mutual-convolution window, and the DLA measurement algorithm based on time domain quasi synchronous. Then making a simulation experiment of the algorithm. The third chapter introduces the design of signal process unit, firstly, the overall design of the power parameters tester is shown, then, the chapter analyzes hardware design of the signal process unit, lastly, the realization process of the power parameters based on DSP has been analyzed particularly. The fourth chapter introduces design ideas of the power parameters tester hardware, firstly, the chapter summary introduces microcontroller of the management unit. Then, the chapter analyzes hardware design of the management unit, involving the design of each module, includes data storage module, data communication module, human interface module. In addition, the chapter also introduces the design of PCB process, and gives the show of management system's PCB. The fifth chapter introduces the design of software system with the embedded system MQX. In order to realize the management unit of the tester, this chapter analyzes the embedded sys tem MQX through the microkernel and the boot loader, and the software design of each module with MQX. The last chapter is mainly about the test of the effectiveness and accuracy of the power parameters tester.The results of test and detection show that th e errors of power quality measurement of power parameters tester in this thesis meet GB/T 19862-2005 "General requirements for PQ monitoring equipment", which have achieved Class A standards, and the errors of DLA measurement meet DL/T 962-2005 “General technical specifications of the high voltage dielectric loss detector”. Finally, the thesis summarizes the innovation points and weakness, and points out the next phase of research work and its outlook.