PHASOR DATA MEASURING INSTRUMENT USING ADVANCED RISC MACHINE7 MICROCONTROLLER

摘要

A system for real time measurement of magnitude and phase angle of a sinusoidal signal of an AC Power supply, comprising: a p hasor Microcontroller; a GPS receiver; a GSM modem; an anti-aliasing filter; and a phase locked Oscillator wherein the GPS signal receiver consists of an antenna and receive circuits, which detects 1 PPS (pulse per second) synchronizing signal from the GPS satellites, which is used to correct for drifts in a local clock oscillator, and which keeps the basic time in the (PMU), phase measuring unit the local clock provides the timing signals to the data acquisition module to sample the voltage and current signals with correct time stamps, which are digitally processed locally in the (PMU), and the processed data are transmitted to the communication module, the communication module transmitting the time-stamped data over a standard communication interface to a wider data concentration and the processing system, and wherein the synchronization is achieved by using a sampling clock which is phase -locked to the one-pulse- per-second signal provided by a GPS receiver, the receiver may be built in the PMU, or may be installed in the substation and th e synchronizing pulse distributed to the PMU and to any other device which requires it, the time tags are at intervals that are multiples of a period of the nominal power system frequency.