| Since the late 1980s, with the increasing of the scale of power system, although alleviate the power supply of tensions, power system of pollution phenomenon is more and more serious, especially disturbing load, such as various power rectifier equipment, electric arc furnace, electric railway constantly access electric power systems, which makes power system of power quality serious threat and influence. To ensure the safe and stable operation of the power system, it is urgent to detect in real time for various parameters of power quality. Along with the rapid development of the information science and computer technology, digital signal processing theory gained skip-type development, and its application has covered almost all engineering technology field. Based on the theory of digital signal processing, this paper studies the steady-state parameters of power quality digital calculation method that provides certain theoretical basis for further constructing power quality parameters testing system.This paper firstly summarizes the basic concept of power quality, definition and related national standards, what'smore, This paper analyzes the overseas and domestic research present situation and the development tendency of power quality parameters determination technology.Then, this paper focuses on the various parameters of the power quality of digital algorithm. For example, in harmonic parameter calculation, based on the traditional Fourier algorithm this paper has a deep research into adding window interpolation FFT algorithm, which effectively reduces spectrum leakage and barrier effect caused by the synchronous sampling, and which greatly improves the calculation accuracy of each harmonic amplitude and phase. At the same time the algorithm provides necessary data sources for three-phase unbalance and frequency parameters. For voltage fluctuation and flicker calculation, based on the realization method of digital filter, this paper references the calculation diagiam given by IEC, and effectively complete relevant index detection and calculation. Lastly, in order to make the algorithm further applied in practical power quality parameters testing system, in NI company Labview software platform, the various parameters of power quality are simulated in the paper. the results show that the studied algorithm is high precision, run faster, and meet the actual measurement needs. |
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