Title :
Real-Time Implementation and Testing of a Wavelet-Controlled Dynamic Voltage Restorer
Author :
Saleh, S.A. ; Rahman, M.A.
Author_Institution :
Fac. of Eng. & Appl. Sci., Newfoundland Memorial Univ., St. John, Nfld.
Abstract :
This paper presents an experimental testing of a discrete wavelet transform (DWT)-controlled dynamic voltage restorer (DVR) system for power quality improvement. The proposed DWT-operated DVR system is designed to continuously detect, diagnose and respond to different transient disturbances that may affect the power quality. The input voltage to the proposed DVR system is adjusted by approximation signals to ensure transient-free inputs. Also, the output of the proposed DVR is obtained using a dc-ac inverter, whose switching signals are controlled by a detail signal. Both approximation and detail signals are obtained using DWT of the line voltage. An experimental setup for the proposed DWT-controlled DVR system is constructed, where the DWT is implemented using a dSPACE ds1102 digital signal processing board. Moreover, sinusoidal pulse-width modulation switching signals for the output-end dc-ac inverter are generated using the same DSP board. In this paper, the proposed DVR system is experimentally tested for transient voltage dip, steady-state under voltage and transient harmonic distortion cases. Test results for these cases show accurate, fast and effective DVR system responses. In all tested cases, the load voltage is maintained at its predefined nominal value during and post any abnormal conditions, which validate the proposed operating strategy
Keywords :
PWM invertors; digital signal processing chips; discrete wavelet transforms; harmonic distortion; power supply quality; power system harmonics; power system transients; dc-ac inverter; digital signal processing board; discrete wavelet transform; dynamic voltage restorer; power quality improvement; pulse-width modulation switching; transient disturbances; transient harmonic distortion; transient voltage dip; Continuous wavelet transforms; Digital signal processing; Discrete wavelet transforms; Power quality; Power system restoration; Pulse inverters; Pulse width modulation inverters; Signal restoration; System testing; Voltage fluctuations;
Conference_Titel :
Industry Applications Conference, 2006. 41st IAS Annual Meeting. Conference Record of the 2006 IEEE
Conference_Location :
Tampa, FL
Print_ISBN :
1-4244-0364-2
Electronic_ISBN :
0197-2618
DOI :
10.1109/IAS.2006.256608