Title :
Harmonics in DC to AC converters of single phase uninterruptible power supplies
Author :
Van der Broeck, H. ; Miller, M.
Author_Institution :
Philips Res. Lab., Aachen, Germany
Abstract :
Single phase uninterruptible power supplies (UPS) employ an inverter for DC to AC conversion. Advanced inverters consist of a full bridge transistor topology and an LC filter. An optimal inverter performance can be achieved if the output voltage is controlled by unipolar pulse width modulation (PWM). The paper describes the influence of the unipolar PWM on the voltages and the current within the inverter. Both frequency domain and time domain are used to evaluate the most important harmonics as well as peak and RMS values of the current and voltage ripple. This results in general equations suitable for the inverter design. In addition, two PWM schemes are compared with respect to EMI problems. Finally, measurements are presented which confirm the theoretical work
Keywords :
DC-AC power convertors; PWM invertors; bridge circuits; electromagnetic interference; frequency-domain analysis; power system harmonics; telecommunication power supplies; time-domain analysis; uninterruptible power supplies; voltage control; DC to AC converters; EMI problems; UPS; frequency domain analysis; full bridge transistor topology; harmonics; inverter; optimal inverter performance; output voltage control; single phase uninterruptible power supplies; time domain analysis; unipolar pulse width modulation; voltage ripple; Analog-digital conversion; Bridge circuits; Optimal control; Power harmonic filters; Pulse width modulation; Pulse width modulation inverters; Topology; Transistors; Uninterruptible power systems; Voltage;
Conference_Titel :
Telecommunications Energy Conference, 1995. INTELEC '95., 17th International
Conference_Location :
The Hague
Print_ISBN :
0-7803-2750-0
DOI :
10.1109/INTLEC.1995.499027
