Title :
A Single-Phase Active Filter Using an H-Bridge PWM Converter With a Sampling Frequency Quadruple of the Switching Frequency
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo
fDate :
4/1/2009 12:00:00 AM
Abstract :
This paper presents a digital current regulator for H-bridge pulsewidth modulation (PWM) converters, whose sampling frequency equals quadruple of the switching frequency. The current regulator detects the ac current and manipulates the voltage reference not only at the upper and lower peaks of the PWM triangle carrier but also at its zero crossings. This paper theoretically discusses the switching sequence of the H-bridge PWM converter, and reveals the amount of the voltage error and the condition where the voltage error occurs. A modified deadbeat current regulator is proposed to suppress the current oscillation induced by the voltage error, based on the theoretical analysis. Experimental results are shown to verify the control performance of the proposed current regulator. Moreover, a proposed current regulator is applied to a single-phase active power filter to demonstrate the effectiveness in harmonic compensation.
Keywords :
PWM power convertors; active filters; harmonics suppression; power filters; H-bridge PWM converter; H-bridge pulsewidth modulation converters; PWM triangle carrier; current oscillation; deadbeat current regulator; digital current regulator; sampling frequency quadruple; single-phase active filter; switching frequency; voltage error; zero crossings; Active filters; Digital modulation; Digital-to-frequency converters; Frequency conversion; Pulse width modulation; Pulse width modulation converters; Regulators; Sampling methods; Switching frequency; Voltage; Current regulators; DSPs; digital control; pulsewidth modulation (PWM); shunt active filters;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2008.2009302