A Power Quality Monitoring System Via the Ethernet Network Based on the Embedded System

Abstract

IntroductionThe problems about power quality have increasingly caused a failure or a malfunction of the end user equipment for the past few years up to now.The problems have concerned with either voltage or current frequency deviation.To have the power quality monitoring done flowingly and completely, the measurement takes an important role on voltage, current, frequency, harmonic distortion and waveforms.Many researchers have used methods of power quality measurement (Dugan et al., 2002;Baggini, 2008) while other researchers have used various protocols to control the system (Auler & d'Amore, 2002).Others have presented the data acquisition based on PC (Batista et al., 2003) or Power Line Communication (Hong et al., 2005) or TMS320CV5416 DSP Processor (Rahim bin Abdullah & Zuri bin Sha 'ameri, 2005).Another researcher has applied ARM and DSP processor (Yang & Wen, 2006) or has only applied DSP processor (Salem et al., 2006) to monitoring power quality in real time.In the meantime, the detecting fault signals of power fluctuation in real time and a power quality monitoring for real-time fault detection using real-time operating system (RTOS) are proposed (Yingkayun & Premrudeepreechacharn, 2008,2009) and the low cost power quality monitoring system is suggested (So et al., 2000; Auler & d'Amore, 2009), for example.This chapter has developed the idea of power quality monitoring system via the Ethernet network based on the embedded system with the two selected ARM7 microcontrollers: ADUC7024 and LPC2368.On account of ADUC7024, it has a function of sampling waveforms and of writing the sampling signals to the external memory.Meanwhile, LPC2368 can execute the main tasks: detecting the fault signals; storing fault data in SD-CARD up to 2 GB; and communicating with PC or laptop via the Ethernet network.The power quality monitoring on the embedded system suggested can acquire the voltage, the status and the frequency.It can send them via network at real time, can operate as stand alone equipment and can display the fault signals in real time of power fluctuation.But anyhow, when being absent, we can download the fault data from the site place, depending on the program configuration.In this case the fault signals can be displayed on the screen of the PC or laptop at real time or can be done after as desired.Moreover, there can be a single www.intechopen.com