EPE Association: EPE 1997 – 08: Lecture Session L2d: ELECTRONIC POWER SUPPLIES SYSTEMS

EPE 1997 – 08: Lecture Session L2d: ELECTRONIC POWER SUPPLIES SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 08: Lecture Session L2d: ELECTRONIC POWER SUPPLIES SYSTEMS

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   ANALYSIS AND DESIGN OF A THREE-PHASE INVERTER WITH A NEUTRAL LEG
By R. Zhang; V. H. Prasad; D. Boroyevich; F. C. Lee [View]
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Abstract: A three-phase inverter with a neutral leg is presented in this paper for three-phase four-wire power supply applications; it has superior performance over conventional neutral point clamped threephase inverter with split de-link capacitors, to deal with ground current due to unbalanced load and nonlinear load. Three-dimensional space vector modulation for the 4-legged inverter is described. Average circuit models of the inverter in both stationary and rotating coordinates are given. Power stage and control loop design issues are discussed. Simulation and experimental results for a 150-kW prototype verified the proposed 3D space vector modulation scheme.

   ACTIVE POWER FACTOR CORRECTION OF A SINGLE STAGE AC-DC CONVERTER WITH REACTIVE POWER CONTROL
By M. Butler; W.G. Hurley; W. Wolfle [View]
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Abstract: Switch mode power supplies use a full bridge rectifier to derive raw de voltage from the ac mains, which results in current spikes with high harmonic content. This leads to a poor power factor condition. The usual approach for performing active line harmonic reduction of off-line switch mode power supplies is to add a high power factor, boost pre-regulator, to the existing converter design. This paper analyses the classical boost circuit with input current shaping and shows that the ripple on the output capacitor is excessive, thus in turn a second regulating stage is required. In the new topology, the output ripple is determined and compensating signals are injected. Total power is processed only once, leading to greater efficiency.

   PARALLELLING POWER CONVERTERS FOR AC-DC STEP-DOWN POWER CONVERSION WITH INHERENT POWER FACTOR CORRECTION
By S.Y.R. Hui; H. Chung [View]
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Abstract: This paper describes the modular development of a single-stage AC-DC step down power converter. The converter offers advantageous features such as simple DC-DC type switching control, electrically isolated output, inherent power factor correction, single stage power conversion without using power devices of excessively high voltage and current ratings, the flexibility of modular approach for expansion of power capability and a simplification of design and production procedure for the manufacturing of power converter products especially for Telecom and navigation equipment and auxiliary domestic DC power supply. The operating modes of the converter are described and analysed. Experiments have confirmed the validity of the modular converter operation.

   Single Switch AC/DC Power Factor Correction Converter Valid for Both Three Phase and Single Phase Applications
By 0. Garcia; J.A. Cobos; R. Prieto; J. Uceda [View]
[Download]

Abstract: Single phase and three phase versions of the boost converter have been widely used to obtain a high Power Factor and a low harmonic distortion in AC/DC applications. This paper analyzes the design of a boost converter, acting as a Power Factor Pre-regulator, being the same converter able to operate either with 1 "phi" or 3 "phi" input. Design rules and experimental results are also included in the paper.

EPE 1997 – 08: Lecture Session L2d: ELECTRONIC POWER SUPPLIES SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 08: Lecture Session L2d: ELECTRONIC POWER SUPPLIES SYSTEMS
	[return to parent folder]

	ANALYSIS AND DESIGN OF A THREE-PHASE INVERTER WITH A NEUTRAL LEG By R. Zhang; V. H. Prasad; D. Boroyevich; F. C. Lee	[View] [Download]
Abstract: A three-phase inverter with a neutral leg is presented in this paper for three-phase four-wire power supply applications; it has superior performance over conventional neutral point clamped threephase inverter with split de-link capacitors, to deal with ground current due to unbalanced load and nonlinear load. Three-dimensional space vector modulation for the 4-legged inverter is described. Average circuit models of the inverter in both stationary and rotating coordinates are given. Power stage and control loop design issues are discussed. Simulation and experimental results for a 150-kW prototype verified the proposed 3D space vector modulation scheme.

	ACTIVE POWER FACTOR CORRECTION OF A SINGLE STAGE AC-DC CONVERTER WITH REACTIVE POWER CONTROL By M. Butler; W.G. Hurley; W. Wolfle	[View] [Download]
Abstract: Switch mode power supplies use a full bridge rectifier to derive raw de voltage from the ac mains, which results in current spikes with high harmonic content. This leads to a poor power factor condition. The usual approach for performing active line harmonic reduction of off-line switch mode power supplies is to add a high power factor, boost pre-regulator, to the existing converter design. This paper analyses the classical boost circuit with input current shaping and shows that the ripple on the output capacitor is excessive, thus in turn a second regulating stage is required. In the new topology, the output ripple is determined and compensating signals are injected. Total power is processed only once, leading to greater efficiency.

	PARALLELLING POWER CONVERTERS FOR AC-DC STEP-DOWN POWER CONVERSION WITH INHERENT POWER FACTOR CORRECTION By S.Y.R. Hui; H. Chung	[View] [Download]
Abstract: This paper describes the modular development of a single-stage AC-DC step down power converter. The converter offers advantageous features such as simple DC-DC type switching control, electrically isolated output, inherent power factor correction, single stage power conversion without using power devices of excessively high voltage and current ratings, the flexibility of modular approach for expansion of power capability and a simplification of design and production procedure for the manufacturing of power converter products especially for Telecom and navigation equipment and auxiliary domestic DC power supply. The operating modes of the converter are described and analysed. Experiments have confirmed the validity of the modular converter operation.

	Single Switch AC/DC Power Factor Correction Converter Valid for Both Three Phase and Single Phase Applications By 0. Garcia; J.A. Cobos; R. Prieto; J. Uceda	[View] [Download]
Abstract: Single phase and three phase versions of the boost converter have been widely used to obtain a high Power Factor and a low harmonic distortion in AC/DC applications. This paper analyzes the design of a boost converter, acting as a Power Factor Pre-regulator, being the same converter able to operate either with 1 "phi" or 3 "phi" input. Design rules and experimental results are also included in the paper.