| Abstract |
This paper presents an algorithm for real time detection of short duration voltage disturbances that occur in single phase power supply systems. The method used involves the use of a sliding, overlapping window of fixed size for measuring the RMS (root mean square) value of the voltage signal. The RMS value of a fixed number of voltage samples, is computed over a cycle, and this value is updated over a sample period by the overlapping window. A trigger signal is generated
in response to the comparison of the RMS values between two consecutive cycles of the voltage signal. The trigger
thus obtained, can be used to initiate the operation of the main control system of a Dynamic Voltage Restorer (DVR) to be used in conjunction with the detection unit to mitigate the sag or swell, or as a triggering function to a digital recorder to record the occurrence of the disturbance. The modeling of the algorithm and test of its functioning was carried out in
Matlab – Simulink environment. Reliability of the functioning of the algorithm under conditions of noise and change in the nature of the sag and swell in the voltage signal was tested on real data acquired during events such as starting of induction motor, intermittent loading of welding transformer, and dynamic loading of a captive diesel generator. TMS320F6713 Digital Signal Processor used for the implementation of the algorithm has been programmed through the Matlab embedded link for code composer studio. The experimental set up consists of a digital signal processor (DSP)
TMS320C6713, for generation of trigger, a personal computer for record of the parameters and is successfully tested for real time disturbance detection. |
