Showing papers on "PWM rectifier published in 1989"
01 Oct 1989
TL;DR: In this article, a complete analysis of a synchronous front-end PWM rectifier-inverter system under unbalanced input voltage conditions is presented, including the harmonic assessment of input/output current and voltage waveforms.
Abstract: A complete analysis of a synchronous front-end PWM rectifier-inverter system under unbalanced input voltage conditions is presented. The analysis includes the harmonic assessment of input/output current and voltage waveforms. It is shown both theoretically and experimentally that input voltage unbalance generates uncharacteristic low-frequency harmonic components in the input and output currents. Special emphasis is given to the generation of a DC component in the inverter output voltage in the case in which the output frequency is twice the input frequency. System design curves for different degrees of unbalance for all major system components are reported. Key predicted results are confirmed experimentally. >
178 citations
TL;DR: Different strategies for series and parallel connections of hysteresis current-controlled PWM rectifier have been investigated by experiments, computer simulations, and analyses as mentioned in this paper, and two configurations, having independent local control and common switching control, respectively, were studied.
Abstract: Different strategies for series and parallel connections of hysteresis current-controlled PWM rectifier have been investigated by experiments, computer simulations, and analyses. Each rectifier unit delivers near-sinusoidal current waveforms at unity (or even leading) power factor. Of particular concern are the questions of: (i) system stability; (ii) the capability of the modular units to share voltage (series connection) and current (parallel connection) under steady-state and transient operation; and (iii) sensitivity of performance characteristics to component tolerances. Experiments were made on 1 kW bipolar transistor modular units. Two configurations, having independent local control (type A) and common switching control (type B), respectively, were studied. The study shows that type B is more economical than type A and appears to give a satisfactory performance. >
122 citations
Patent•
10 Apr 1989
TL;DR: In this paper, the authors proposed to suppress the fluctuation of DC output voltage at the time of the service interruption of an AC power source by feeding DC power to a high power-factor converter from a storage battery with a DC power feeding means consisting of switches and the like, and by working the high power factor converter as a step-up chopper.
Abstract: PURPOSE: To suppress the fluctuation of DC output voltage at the time of the service interruption of an AC power source by feeding DC power to a high power-factor converter from a storage battery with a DC power feeding means consisting of switches and the like, at the time of the service interruption of the AC power source, and by working the high power-factor converter as a step-up chopper. CONSTITUTION: When service interruption is generated in an AC power source 1, then a switch 9 is turned OFF, and a switch 10 is turned ON, and a switch 11 is turned OFF, and the DC power of a storage battery 6 is fed to a high power-factor converter, and a PWM rectifier 3 is worked as a step-up chopper. Then, even if the voltage of the storage battery 6 is lowered, the output voltage of the PWM rectifier 3 namely the voltage of a capacitor 4 is made higher than the voltage of the storage battery 6, and the DC output voltage of a power supply unit is controlled to be constant. As a result, the fluctuation width of the DC output voltage at the time of the service interruption of the AC power source 1 can be suppressed to be slight. COPYRIGHT: (C)1990,JPO&Japio
6 citations