Title :
A cascaded H-bridge converter for a new type of the VLF high voltage generator
Author :
Kongnun, W. ; Sangswang, A. ; Chotigo, S.
Author_Institution :
Dept. of Electr. Eng., King Mongkut´´s Univ. of Technol. Thonburi, Bangkok, Thailand
Abstract :
This paper presents a new design of a new type of the very low frequency (VLF) high voltage generator. A new structure of the VLF generates is implemented using multilevel voltage source converter in cascaded H-bridge configuration for 0.1 Hz sinusoidal waveform generation. It consists of two main parts, a modulation unit and a high voltage switching unit. The modulation unit compares the 0.1 Hz of sinusoidal waveform with the 10 kHz of carrier waveform. The switching unit consists of 6 H-bridge modules and phase disposition (PD) multicarrier modulation scheme to generate 13 levels of PWM signals. The cascaded H-bridge converter can convert the high voltage direct current (HVDC) to the multilevel step pulse signal and filtered to the sinusoidal waveform at 0.1 Hz with a low-pass filter. The experimental result of this circuit has total harmonic distortion (THD) value less than 5% according to the IEEE 400.2 standards.
Keywords :
PWM power convertors; electric generators; harmonic distortion; H-bridge modules; IEEE 400.2 standards; PWM signals; cascaded H-bridge converter; frequency 0.1 Hz; frequency 10 kHz; high voltage direct current; phase disposition multicarrier modulation scheme; total harmonic distortion; very low frequency high voltage generator; Circuits; Frequency; HVDC transmission; Low pass filters; Phase modulation; Pulse width modulation; Pulse width modulation converters; Signal generators; Total harmonic distortion; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-4367-3
Electronic_ISBN :
978-1-4244-4368-0
DOI :
10.1109/ICPADM.2009.5252497
