| The mainstream of test instruments development is that it is combined with the computer technology. Therefore virtual instruments technology has become an important field of test instruments technology. In this paper the virtual instrument technology is used to the power system harmonics measurement and the virtual instrument on harmonics analysis is developed and studied using a computer and UA301A data acquisition as the hardware platform and LabVIEW as the software platform of the virtual instrument. FFT algorithm is used for harmonics analysis.Firstly it is the analysis of the harmonics hazards, the harmonics research status in home and aboard and the measurement algorithms on harmonics in the paper. Then it introduces the development technology of virtual instruments, the basic theory that the system depends on and the hardware and software development platform of the system, and then a detailed description of the system software architecture is shown, including the interface driving program design between the data acquirement and LabVIEW and the software application program design using the way of the quasi-synchronous sampling and synchronous sampling to acquire data of the signal. FFT algorithm is used to make the real–time harmonics analysis. Finally it carrys through a simulation, the experiment circuit design and the measurement of parameters of the experiment system.The software of the system is composed by the human-machine interface, data transmission and data processing. The measurement functions of the main interface in the system include three modules--spectrum measurements, harmonics analysis and power measurements. The measured data are saved to Excel format and the shown graphics are saved to bmp format.Through the simulation and the measurement of parameters in experiment system, it proves that the design of the system is reasonable and feasible. |
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