基于DSP的交流电参量测量仪的研究

在电力系统谐波环境下,采用传统仪器或常规微机测量算法会使电参量测量出现一定程度的误差。应用傅氏变换原理及FFT快速算法消除谐波对测量的影响,同时与DSP技术相结合,研制了以TI公司TMS320F240DSP为核心的测控装置,分析了仪器的硬件电路原理,实现了对交流电参量快速、准确、实时的测量。实验结果表明,本装置达到了国家标准对谐波测量仪器的要求。

Study of AC electrical parameter measuring instrument based on DSP

In the power system polluted by harmonics, both traditional instrument and computer-based instrument with traditional measuring algorithm may bring certain errors for electric parameters. Principle of Fourier transforming and algorithm of FFT are employed to eliminate the impact of harmonics, and combined with digital signal processor, the device of measuring and controlling is developed, which uses DSP TMS320F240 as CPU. The principle of hardware circuit of the device is analysed, it can realize the measurement of AC electric parameter fast, accurately and in real time, and the test results indicate the instrument has met the requirements of national criteria.