EPE Association: EPE 2003 - Topic 08c: Distributed Power Supplies

EPE 2003 - Topic 08c: Distributed Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08c: Distributed Power Supplies

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   Effect of output current feedback on converter dynamics
By T. Suntio; K. Kostov; T. Tepsa; J. Kyyrä [View]
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Abstract: In this paper, a consistent methodology to assess the effect of load current feedback on the converter dynamics to obtain zero output impedance or load invariance under constant-voltage control is presented. It is shown that the unity feedback in the case of a peak-current-mode (PCM) controlled buck derived converter results in a near-zero-output-impedance condition. For the boost and buckboost derived converters similar reductions of output impedance may not be possible to obtain due to the non-minimum-phase behavior and the duty-ratio dependency of the control-to-output transfer function.

   SiC Switch in single stage converter for distributed power supplies
By A. Melkonyan; I. Zverev [View]
[Download]

Abstract: An overview of the modern converters used in telecom SMPS (600W- 3 kW), their limitations and alternative solution based on the Single Switch topology to overcome these limitations are presented in this paper. Additionally the Single Switch approach is shown to utilise the semiconductor devices more efficiently, obtain higher power density and lower system costs. Application of the new SiC JFET transistor in the proposed topology is presented and compared with conventional topologies.

   Two phase high density DC-DC converter with current sharing and hot pluggability
By R. Vai; L. Salati; G. Gritti [View]
[Download]

Abstract: Initially developed for CPU power supply, the Multi-Phase topology is now applicable also to highdensity DC/DC converter. The Multi-Phase topology benefits input filter and components size reduction resulting in power density increase that allows power supply size reduction too. Implementing high power solutions by using more than one paralleled module, allows reducing both their size and failure rate. Current sharing control among modules and hot pluggability contribute to design a complete and robust uninterruptible solution. This paper discusses the design of a high-current DC/DC converter module using a dual phase controller L6712 and a current sharing controller L6615: it features Single-Wire Current Sharing Bus among modules and hot-plug capability.

   Design guidelines for HF interactions reduction within distributed power systems
By M. Fisal Alkayal; J.-C. Crebier [View]
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Abstract: Guidelines for HF interactions reduction within Distributed Power Systems or cascaded converters are developed in this paper. The aim of this study is not only to avoid the destabilization or functionality disturbance of converters because of HF interactions between converters, but also to decrease, under specific operating conditions, the EMI filters size used between converters. Firstly the problematic of HF interactions between cascaded converters will be recalled. A model considering the HF interactions in closed-loop system and showing the influence of the control-loop is reminded. Using the proposed model, effects of the control loop are shown. Results of practical validation showing the influence of control loop absence on converter characteristics under HF interactions are studied. Guidelines are presented in order to limit the influence of HF interactions and to decrease filter size in open and closed-loop. A practical application validates the demonstrated approach of the converter filter size decrease.

   Power conversion system autonomous power conditioning method for grid frequency stability
By J. Baba [View]
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Abstract: To stabilize grid frequency and voltage for distribution system, the autonomous power conditioning method for power conversion system that has no physical power balancing dynamics, is proposed. Simulation results show that the converter can contribute to the stabilization of grid frequency by absorbing the rapid demand fluctuation. Even-though the frequency dumping coe±cient is small, the converter with the proposed controller can suppress the grid frequency oscillation.

   A non-linear current-sharing control of a parallel half-bridge complementary-control converter system
By J. Matas; L. G. de Vicuña; J. M. Guerrero; J. Miret; O. López [View]
[Download]

Abstract: This paper deals with the non-linear control of paralleled Half-Bridge with Complementary-Control (HBCC) converters. The converters are connected in parallel using a master-slave current-sharing scheme. A large-signal model of a single HBCC converter is presented in order to deduce the nonlinear control structure that is applied to the HBCC master converter. The control behavior of the system has been tested with proper simulations.

   Contribution to the study of distributed power systems
By I. Sadli; S. Pierfederici; F. Meibody--Tabar; B. Davat [View]
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Abstract: In this paper we study the control of a distributed power system constituted by a 3- phases controlled rectifier which represents the line conditioner and a set of loads all constituted by inverters and Permanent Magnet Synchronous Motors connected to the same DC link. To prove the stability of the whole system and to improve the dynamic behavior of all the elements, a generalized uncoupled structure is defined. This structure allows an easy dimensioning of controller parameters, improves dynamic behavior of the line conditioner and decreases the effects of perturbations generated by the loads variations. Moreover the size of passive elements can be significantly decreased.

EPE 2003 - Topic 08c: Distributed Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 08: POWER SUPPLIES > EPE 2003 - Topic 08c: Distributed Power Supplies
	[return to parent folder]

	Effect of output current feedback on converter dynamics By T. Suntio; K. Kostov; T. Tepsa; J. Kyyrä	[View] [Download]
Abstract: In this paper, a consistent methodology to assess the effect of load current feedback on the converter dynamics to obtain zero output impedance or load invariance under constant-voltage control is presented. It is shown that the unity feedback in the case of a peak-current-mode (PCM) controlled buck derived converter results in a near-zero-output-impedance condition. For the boost and buckboost derived converters similar reductions of output impedance may not be possible to obtain due to the non-minimum-phase behavior and the duty-ratio dependency of the control-to-output transfer function.

	SiC Switch in single stage converter for distributed power supplies By A. Melkonyan; I. Zverev	[View] [Download]
Abstract: An overview of the modern converters used in telecom SMPS (600W- 3 kW), their limitations and alternative solution based on the Single Switch topology to overcome these limitations are presented in this paper. Additionally the Single Switch approach is shown to utilise the semiconductor devices more efficiently, obtain higher power density and lower system costs. Application of the new SiC JFET transistor in the proposed topology is presented and compared with conventional topologies.

	Two phase high density DC-DC converter with current sharing and hot pluggability By R. Vai; L. Salati; G. Gritti	[View] [Download]
Abstract: Initially developed for CPU power supply, the Multi-Phase topology is now applicable also to highdensity DC/DC converter. The Multi-Phase topology benefits input filter and components size reduction resulting in power density increase that allows power supply size reduction too. Implementing high power solutions by using more than one paralleled module, allows reducing both their size and failure rate. Current sharing control among modules and hot pluggability contribute to design a complete and robust uninterruptible solution. This paper discusses the design of a high-current DC/DC converter module using a dual phase controller L6712 and a current sharing controller L6615: it features Single-Wire Current Sharing Bus among modules and hot-plug capability.

	Design guidelines for HF interactions reduction within distributed power systems By M. Fisal Alkayal; J.-C. Crebier	[View] [Download]
Abstract: Guidelines for HF interactions reduction within Distributed Power Systems or cascaded converters are developed in this paper. The aim of this study is not only to avoid the destabilization or functionality disturbance of converters because of HF interactions between converters, but also to decrease, under specific operating conditions, the EMI filters size used between converters. Firstly the problematic of HF interactions between cascaded converters will be recalled. A model considering the HF interactions in closed-loop system and showing the influence of the control-loop is reminded. Using the proposed model, effects of the control loop are shown. Results of practical validation showing the influence of control loop absence on converter characteristics under HF interactions are studied. Guidelines are presented in order to limit the influence of HF interactions and to decrease filter size in open and closed-loop. A practical application validates the demonstrated approach of the converter filter size decrease.

	Power conversion system autonomous power conditioning method for grid frequency stability By J. Baba	[View] [Download]
Abstract: To stabilize grid frequency and voltage for distribution system, the autonomous power conditioning method for power conversion system that has no physical power balancing dynamics, is proposed. Simulation results show that the converter can contribute to the stabilization of grid frequency by absorbing the rapid demand fluctuation. Even-though the frequency dumping coe±cient is small, the converter with the proposed controller can suppress the grid frequency oscillation.

	A non-linear current-sharing control of a parallel half-bridge complementary-control converter system By J. Matas; L. G. de Vicuña; J. M. Guerrero; J. Miret; O. López	[View] [Download]
Abstract: This paper deals with the non-linear control of paralleled Half-Bridge with Complementary-Control (HBCC) converters. The converters are connected in parallel using a master-slave current-sharing scheme. A large-signal model of a single HBCC converter is presented in order to deduce the nonlinear control structure that is applied to the HBCC master converter. The control behavior of the system has been tested with proper simulations.

	Contribution to the study of distributed power systems By I. Sadli; S. Pierfederici; F. Meibody--Tabar; B. Davat	[View] [Download]
Abstract: In this paper we study the control of a distributed power system constituted by a 3- phases controlled rectifier which represents the line conditioner and a set of loads all constituted by inverters and Permanent Magnet Synchronous Motors connected to the same DC link. To prove the stability of the whole system and to improve the dynamic behavior of all the elements, a generalized uncoupled structure is defined. This structure allows an easy dimensioning of controller parameters, improves dynamic behavior of the line conditioner and decreases the effects of perturbations generated by the loads variations. Moreover the size of passive elements can be significantly decreased.