A suggested methodology for data acquisition, measurement and control using microcomputer and multiprocessor systems

Abstract

Abstract This paper proposes three-phase measurement systems which can be built around a microcomputer and further upgraded using multiprocessors. These systems will have the ability to measure the instantaneous values of three-phase voltages and currents and to use these values to calculate active power, reactive power, RMS and peak values of voltage and current, and to display these values using graphic capabilities. These systems can also be used to measure DC voltages and currents and calculate DC power. The maximum frequencies of the three-phase signals that can be measured depend on the sampling rate of the system, which depends on different factors such as the frequency of operation of the microcomputer and of its various peripherals. An attempt will be made to relate these different factors to the sampling rate of the system. The maximum resolution of measurements that can be made by this system depends on the analog/digital (A/D) converter that is used. A maximum resolution of 0.0015% can be achieved by using a 16-bit A/D converter.