Embedded Web Server Based Power Quality Recorder

An embedded Web server (EWS) based power quality (PQ) recorder is designed in this paper to achieve the goal of PQ remote monitoring and recording. An EWS is a Web server that runs on an embedded system and is possible to provide a powerful Web-based management and control interface with tiny volume. Therefore, it will be very suitable for PQ remote monitoring and recording. The experimental platform used in this paper is a Samsung S3C4510-based embedded system. This embedded system features an uCLinux operating system; therefore, the design and implementation of the proposed EWS system will be more efficient and effective. An embedded PQ analyzer with appropriately designed I/O interface and peripherals is designed and implemented firstly. The PQ analyzing functions implemented in the proposed system include 1) system voltage and frequency calculation, 2) harmonic spectra and total harmonic distortion calculation and 3) abnormal event recorder etc. Then, a Web human-machine interface (HMI) programmed using ActiveX technology, which is suitable for EWS and can be used for PQ monitoring, is designed. The proposed EWS based PQ recorder can be used for remote monitoring with minimum size and maximum efficiency. It will be also helpful for large-scale and wide-area PQ monitoring and recording. Experimental results demonstrate the validity of the proposed system.