| The nonlinear load in power system brings a lot of harmonics to the power system.As a kind of pollution source in the power system,harmonics not only bring some harm to the electrical environment,but also affect the power quality and electric energy measurement.The application of digital electric energy meter in measuring harmonic energy will become a new problem.To do the work on the measurement of harmonic energy,and ensure the accuracy of measurement results,we need the harmonic digital source should contain enough harmonics,and the harmonic signal can be used to simulate the harmonic pollution signal.At present,the main method of harmonic generation is frequency synthesis technique.With the rapid development of digital technology,direct digital synthesis(DDS)is the most widely used synthetic technology,considering the system output signal of the speed,the accuracy of data storage and other factors,on the basis of this technique,proposes an interpolation algorithm based on Taylor series bilinear signal,meet the requirements of precision and speed at the same time save a large number of data storage space.Based on DDS technology,implements a harmonic digital source system design based on FPGA.This system mainly uses FPGA chip as the core controller,the hardware control circuit and interface circuit of each module,and the software program design using Verilog HDL language,the realization of hardware and software debugging,and through TFT-LCD directly and conveniently view the output signals and other information.At the same time,using Model Sim to simulate the function of the system and compare with the actual output signal,summarize the possible errors in the system.The overall operation of the harmonic digital source designed in this paper,the output harmonic signal effect is good.After analyzing the performance of the system,the system can achieve the design index,which has important technical referencevalue for harmonic detection and control of power system. |
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