The Design And Research Of Data Acquisition And Processing System On Electric Power Efficiency Monitoring Terminal

With the rapid development of economy,a variety of energy crises have appeared.As the lifeblood of the national economic development,the healthy development of electric power has been given a lot of care and support from the central government.At present,our country is vigorously developing the demand side management platform.Besides,standards trying to improve the quality of electric energy efficiency monitoring terminal and ensure the safety and stable operation of electric energy efficiency monitoring system are built from the aspects of data monitoring and analysis.An electric energy efficiency monitoring terminal is independently developed.Its data acquisition and processing system is designed and researched in this thesis,which is as follows:Firstly,the main demand of system and performance of the various parameters are analyzed.The key technology of system design which mainly includes data acquisition technology and anti-jamming technology are introduced.Then by comparing the various alternative designs of electrical energy efficiency monitoring terminal,a specific system design and the overall solution are proposed in this thesis.Secondly,harmonic analysis is an important research object in the data processing system.Several harmonic analyses of the current popular theories are relatively studied in this thesis,including the theory based on instantaneous reactive power,the theory of wavelet transform and the theory of Fourier transform.The advantages and disadvantages of these theoretical methods are comparatively analyzed.An interpolated FFT algorithm based on hanning window is finally adopted by the system,and it is emphatically studied.Thirdly,the hardware design of the data acquisition and processing system are proposed in this thesis.The hardware circuit mainly includes transformer,anti-aliasing filter circuit,frequency capture circuit,A/D interface circuit,DC analog signal conditioning module and data processing module based on DSP.Their working principle are analyzed in detail and the corresponding diagram design are given in this paper.Fourthly,the detailed design process of each software module in the system are discussed in this thesis.It mainly includes the main program design,AC data acquisition and processing module design,DC data acquisition and processing module design,serial communication module design based on SCI.Then the implementations of the core FFT algorithm and implementation methods of some power parameters on the software are proposed,which we focus on in this part.Finally,through the research and design in the system,the electric energy efficiency monitoring terminal is developed independently.The PCB of the system is debugged,and the monitoring terminal is tested by the standard signal source.The test mainly includes the voltage,current,active power,harmonic and the DC analog inputs.The rationality of hardware and software design presented in this thesis is proved by the test results.