โปรแกรมสร้างสัญญาณแรงดันไฟฟ้าตกชั่วขณะ สำหรับทดสอบอุปกรณ์ไฟฟ้า

Abstract

This thesis presents a voltage sag signal generator program with MATLAB. This proposed method is used to generate the voltage sag signals for three-phase voltage source inverter for testing electrical equipment based on the SEMI F47 and IEC61000-4-11 standards. Under standard conditions on voltage sags, the required parameters can easily be defined in the toolbox, and the output voltage sag signals of inverter are recorded in four formats, such as MATLAB figure file, MATLAB mat file, CSV data file and PNG image file to analyze the power quality of these signals in the future. The voltage sag signal comparison between the actual measured voltage of the inverter and the desired voltage command in MATLAB/Simulink are also provided to verify the proposed method. In addition, this method can generate the voltage sag signals according to the classification of voltage sags on all conditions where the voltage sag waveforms can monitor before sending the data to the inverter. The actual voltage waveforms of the inverter are in agreement with the desired voltage command in MATLAB whereas the output voltage waveform distortion of the inverter is between 7.94% and 14.85% due to the inverter performance. The validity of this approach was confirmed by experimental results.