Showing papers on "PWM rectifier published in 1992"
29 Jun 1992
TL;DR: In this paper, a three-phase single-stage, isolated PWM rectifier capable of power factor correction and low harmonic current distortion and at the same time realizing zero voltage switching for all power semiconductor devices is proposed.
Abstract: A three-phase, single-stage, isolated PWM rectifier capable of power factor correction and low harmonic current distortion and at the same time realizing zero voltage switching for all power semiconductor devices is proposed. The circuit is thoroughly analyzed. Design equations and tradeoffs are provided. The performance of the circuit is demonstrated through the implementation of a 2 kW, 91 kHz, digital signal processor controlled prototype. The isolated DC output voltage is regulated at 50 V. The conversion efficiency is around 93%. >
47 citations
29 Jun 1992
TL;DR: In this paper, a real-time multi-DSP controller for a high-quality, six-valve, three-phase, current-source, unity power factor, PWM rectifier is discussed.
Abstract: The design of a real-time multi-DSP controller for a high-quality, six-valve, three-phase, current-source, unity power factor, PWM rectifier is discussed. With the decoupler preprocessor and the dynamic trilogic PWM trigger scheme, each of the three input currents can be controlled independently. Based on the a-b-c frame system control and the fast parallel computer control, the pole placement control method is implemented successfully to achieve fast response in the AC currents. The low frequency resonance in the AC filter LC networks has been damped effectively. The experimental results are obtained from a 1 kVA bipolar transistor current-source PWM rectifier with a real-time controller using three TMS320C25 DSPs. >
42 citations
04 Oct 1992
TL;DR: In this article, a single-ended pulse width modulated (PWM) three-phase rectifier is presented, which is capable of high power factor and wide output voltage regulation while using high-frequency transformer insulation.
Abstract: A single-ended pulse width modulated (PWM) three-phase rectifier is presented. It is capable of high power factor and wide output voltage regulation while using high-frequency transformer insulation. The circuit behavior is investigated with the assumption of discontinuous input current operation. Design criteria are derived. The actual converter performances are verified on a 1.5 kW prototype, fed by a 380 V AC supply, in which insulation and voltage adaptation are realized by a 50 Hz transformer. Resulting AC current distortion is below 7%, efficiency is better than 90%, and power density is in the range of 0.4 kW/1. >
32 citations
29 Jun 1992
TL;DR: In this article, the circuit D-Q transformation is used to analyze a three-phase, current-source, pulse-width modulated (PWM) rectifier and the DC operating point and AC transfer functions are completely determined.
Abstract: The circuit D-Q transformation is used to analyze a three-phase, current-source, pulse-width modulated (PWM) rectifier. The DC operating point and AC transfer functions are completely determined. Most features of the converter are clearly interpreted. The output voltage can be controlled from zero to maximum. The system is equivalently an ideal current source in the steady state and can be described in terms of linear circuits. The input power factor can be arbitrarily controlled with a certain control range. >
15 citations
TL;DR: The compensated carrier PWM synchronization (CCPS) method for AC-fed PWM power converters is presented in this article, which provides a solution to PWM converters fed by industrial power systems (IPSs).
Abstract: The compensated carrier PWM synchronization (CCPS) method for AC-fed PWM power converters is presented. The method provides a solution to PWM converters fed by industrial power systems (IPSs). Such environments usually present unbalances and magnitude fluctuations of AC voltages. Those circumstances impair standard PWM techniques because low-order harmonics are produced and DC-link regulation is poor. To reduce these undesirable effects produced by IPS, a method based on using independently compensated carriers per phase was conceived. In particular, CCPS prevents second harmonic generation and achieves converter self-regulation. The method can be used with any PWM technique and bidirectional power flow. The evaluation of CCPS is based on a complete performance comparison of a PWM rectifier with and without CCPS for various known PWM techniques. >
11 citations
09 Nov 1992
TL;DR: Three forms of the hybrid drive are presented which contribute to the development of voltage source pulse width modulation (PWM) inverter drives with inherent self-protection against fault currents and one of the three forms minimizes the current rating of the DC link inductors.
Abstract: Hybrid drive circuit topologies are presented which contribute to the development of voltage source pulse width modulation (PWM) inverter drives with inherent self-protection against fault currents The central feature of the hybrid drive is to automatically decouple the DC link capacitance from the drive power converters during fault conditions The author shows how one of the three forms of the hybrid drive minimizes the current rating of the DC link inductors Where required, the buck-type hybrid drive can be used to minimize the size of the inductors together with the DC link capacitor The PWM rectifier hybrid drive permits unity input power factor operation and control of the DC link inductor current during output overhead current conditions Extensive simulation results are used to demonstrate the performance of the drive during steady state operation and during output short circuit fault conditions >
10 citations
23 Feb 1992
TL;DR: In this paper, a pulsewidth-modulated (PWM) voltage source rectifier, controlled by the load DC current instead of the DC voltage, has been developed, which works with an unchangeable and predefined PWM pattern.
Abstract: A novel pulse-width-modulated (PWM) voltage source rectifier, controlled by the load DC current instead of the DC voltage, has been developed. Its main characteristics are: (a) there are neither input current sensors nor DC voltage sensors; (b) it works with an unchangeable and predefined PWM pattern; (c) it has very strong stability; (d) its stability does not depend on the size of the DC capacitor; (e) it can work at leading power factor for all load conditions; and (f) it can also work with zero regulation for all load conditions. Digital simulations, analyses, and experiments confirm all these characteristics of the control method. >
9 citations
04 Oct 1992
TL;DR: In this article, a three-phase hybrid inverter drive circuit topology is described for high-power applications, which supplies the output inverter with a dual DC-link consisting of a constant current and a constant voltage.
Abstract: This paper describes a three-phase "hybrid" inverter drive circuit topology, suitable for high-power applications, that supplies the output inverter with a dual DC-link consisting of a constant current and a constant voltage. Four basic hybrid drive types are described: freewheel diode, buck, boost, and the PWM rectifier. The resultant drive topologies combine the current overload protection features associated with a current source inverter together with the high performance associated with a pulse-width modulated voltage source inverter. Three-phase pulse-width modulated schemes are investigated to show that the output inverter bridge can be used to control the DC-link voltage and the DC-link current without interfering with the pulse-width modulated voltage waveforms fed to the motor. Computer simulations and experimental results are used to demonstrate the operating features of the various drive types. >
7 citations
09 Nov 1992
TL;DR: It is concluded that the synchronous link power converter gives a higher performance but is more complicated to operate, while the PWM rectifier provides good performance with simple control strategies.
Abstract: The authors present a systematic comparison of the current source topology (pulse width modulation, or PWM rectifier) and the voltage source topology (synchronous link power converter) from the point of view of power converter and switch kilovolt ampere ratings. PWM patterns and input and output filtering requirements, power factor, operating regions, and control aspects. Experimental results obtained on laboratory prototypes are used to validate the theoretical considerations. In general, it is concluded that the synchronous link power converter gives a higher performance but is more complicated to operate. Unity power factor and regenerative operation are achieved with closed-loop control. The PWM rectifier provides good performance with simple control strategies. It requires a larger filter to suppress the input line harmonics, but is simple to operate since open-loop operation is possible. >
5 citations
TL;DR: In this article, a voltage-source PWM rectifier-inverter with feedforward control of instantaneous power is described, where the instantaneous power which is calculated in the control circuit of the inverter is fed forward to the rectifier.
Abstract: In general, diode rectifiers with electrolytic capacitors on the dc side have been used as dc power supplies for voltage-source inverters. Rectifiers of this type, however, cause many problems such as poor power factor and harmonics. Recently, voltage-source PWM rectifier-inverters have been studied to provide the following advantages: (1) harmonic-free on both ac sides; (2) unity power factor on the input ac side; (3) power flow of either direction or power regeneration; (4) reduction of the dc capacitor. However, it is difficult for a conventional voltage-source PWM rectifier-inverter to regulate the capacitor voltage on transient states because it has only a voltage feedback loop.
This paper describes a voltage-source PWM rectifier-inverter with feedforward control of instantaneous power. Based on the pq theory, the instantaneous power which is calculated in the control circuit of the inverter is fed forward to the control circuit of the rectifier. The feedforward control of instantaneous power contributes greatly to sufficiently suppress voltage fluctuation of the dc capacitor on transient states. Transient characteristics are discussed, and some interesting experimental results of a laboratory model are shown.
4 citations
Patent•
22 Jan 1992
TL;DR: In this paper, the PWM rectifier is made to conduct an inverter operation by switching it from an ordinary charging mode over to a regenerative mode on the basis of a signal of this detection and by returning thereby an effective power stored in a DC circuit onto the AC input side.
Abstract: PURPOSE:To suppress a rise in a DC voltage by detecting a state of DC overvoltage of a PWM rectifier due to a current from a bypass circuit, by making the PWM rectifier conduct an inverter operation by switching it from an ordinary charging mode over to a regenerative mode on the basis of a signal of this detection and by returning thereby an effective power stored in a DC circuit onto the AC input side. CONSTITUTION:When a DC overvoltage is detected in a state wherein an inverter output and a bypass output lap over, an analog switch 25 is turned ON through an AND gate 223, an NAND gate 225, a flip-flop 226 and an NOT circuit 227 and a voltage adjustment signal is made low forcedly through an addition circuit 23 and an inversion circuit 24 so that a PWM rectifier 4 be set in a regenerative mode. Thereby an input current set value of the PWM rectifier is decreased and the PWM rectifier is made to conduct a regenerative operation, so that an effective power stored in a DC current thereof be returned onto the AC input side (commercial power source side). Accordingly, the state of the DC overvoltage of the PWM rectifier is suppressed.