EPE Association: EPE-PEMC 2002: Special Session: Multilevel Converters

EPE-PEMC 2002: Special Session: Multilevel Converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2002 - Conference > EPE-PEMC 2002: Special Session: Multilevel Converters

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   Control of Three-Level VSI using LQR-based Gain-Scheduling Technique for the Regulation of the DC-Link and the Output Voltages
By A. Gilabert; J. Bordonau; J. Salct; S. Alepuz; J. Peracaula [View]
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Abstract: An approach for the large-signal and complete control of the Neutral-Point-Clamped VSI is presented. A comprehensive mathematical multivariable model is used in this work. The model is general and can be applied to generic types of sources, filters and loads. No information about the system is lost with this model. A simple and effective method to design the control strategy for a Three-Level VSI is introduced. Linear Quadratic Regulator (LQR) and Gain-Scheduling techniques work concurrently in the regulator. With the model and regulator presented, DC-link unbalance regulation is also achieved by means of the controller action. Then, a switching strategy to control DC-link neutral point voltage is not required. Simulation results verify the validity of the proposed model and controller.

   Generalized, Versatile Sine Triangle Comparison PWM Scheme Based upon A Space Vector Scheme for Three-Level Topology
By J. Bordonau; D. Zhou; V. Blasko [View]
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Abstract: In this paper three variables are introduced to derive a generalized sine triangle comparison method for three-level topology. With the help of these variables along with different triangle carrier waveforms, it is shown that traditional space vector as well as other PWM generation methods can be reproduced by the resultant scheme. The scheme possesses faster implementation from triangle comparison while its correspondence to space vector easily provides intuitive insights to its effectiveness on issues specific to three-level topology, such as guaranteeing minimum on/off time and balancing neutral point voltage. Effect of these variables on PWM quality is studied.

   Medium Voltage Converters, A Cost Effective Solution for
By P. K. Steimer; J. K. Steinke; O. Apeldoorn; N. Celanovic [View]
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Abstract: Recent developments in wind industry show a clear trend toward the ever-higher power machines. One driver behind this development is the trend to move wind power plants offshore. To be successful offshore a reliable and robust concept is required in the 2 to 5MW power range. In this paper we present the technical characteristics and performance features of the four quadrant, neutral point clamped, medium voltage converter optimized for the application in multi megawatt wind power plants.

   Three-Level Front-End Converters for Distributed Power Systems
By F. C. Lee; S.-J. Jeon; F. Canales; P. Barbosa [View]
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Abstract: This paper presents three-level converters used in distributed power systems (DPS) applications. Three categories of converters are addressed in the paper: (1) two-stage approach, (2) quasi-single-stage solution and (3) single-stage converter. The two-stage approach is deemed the most advantageous in achieving high efficiency, while the simplicity of the single-stage topologies can reduce the cost of the DPS front-end converter. The quasi-integrated front-end converter discussed in the paper represents a tradeoff between performance and cost, since it needs the same number of switches as compared to the single-stage approach but eliminates the fluctuation of the intermediate bus voltage. The paper compares all solutions in terms of overall efficiency, harmonic distortion, intermediate bus voltage stress and size of the input filter under interleaved operation. The power level application target addressed in the paper is 3kW for single converter or 6kW when two converters are interleaved to provide input current ripple cancellation.

EPE-PEMC 2002: Special Session: Multilevel Converters
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2002 - Conference > EPE-PEMC 2002: Special Session: Multilevel Converters
	[return to parent folder]

	Control of Three-Level VSI using LQR-based Gain-Scheduling Technique for the Regulation of the DC-Link and the Output Voltages By A. Gilabert; J. Bordonau; J. Salct; S. Alepuz; J. Peracaula	[View] [Download]
Abstract: An approach for the large-signal and complete control of the Neutral-Point-Clamped VSI is presented. A comprehensive mathematical multivariable model is used in this work. The model is general and can be applied to generic types of sources, filters and loads. No information about the system is lost with this model. A simple and effective method to design the control strategy for a Three-Level VSI is introduced. Linear Quadratic Regulator (LQR) and Gain-Scheduling techniques work concurrently in the regulator. With the model and regulator presented, DC-link unbalance regulation is also achieved by means of the controller action. Then, a switching strategy to control DC-link neutral point voltage is not required. Simulation results verify the validity of the proposed model and controller.

	Generalized, Versatile Sine Triangle Comparison PWM Scheme Based upon A Space Vector Scheme for Three-Level Topology By J. Bordonau; D. Zhou; V. Blasko	[View] [Download]
Abstract: In this paper three variables are introduced to derive a generalized sine triangle comparison method for three-level topology. With the help of these variables along with different triangle carrier waveforms, it is shown that traditional space vector as well as other PWM generation methods can be reproduced by the resultant scheme. The scheme possesses faster implementation from triangle comparison while its correspondence to space vector easily provides intuitive insights to its effectiveness on issues specific to three-level topology, such as guaranteeing minimum on/off time and balancing neutral point voltage. Effect of these variables on PWM quality is studied.

	Medium Voltage Converters, A Cost Effective Solution for By P. K. Steimer; J. K. Steinke; O. Apeldoorn; N. Celanovic	[View] [Download]
Abstract: Recent developments in wind industry show a clear trend toward the ever-higher power machines. One driver behind this development is the trend to move wind power plants offshore. To be successful offshore a reliable and robust concept is required in the 2 to 5MW power range. In this paper we present the technical characteristics and performance features of the four quadrant, neutral point clamped, medium voltage converter optimized for the application in multi megawatt wind power plants.

	Three-Level Front-End Converters for Distributed Power Systems By F. C. Lee; S.-J. Jeon; F. Canales; P. Barbosa	[View] [Download]
Abstract: This paper presents three-level converters used in distributed power systems (DPS) applications. Three categories of converters are addressed in the paper: (1) two-stage approach, (2) quasi-single-stage solution and (3) single-stage converter. The two-stage approach is deemed the most advantageous in achieving high efficiency, while the simplicity of the single-stage topologies can reduce the cost of the DPS front-end converter. The quasi-integrated front-end converter discussed in the paper represents a tradeoff between performance and cost, since it needs the same number of switches as compared to the single-stage approach but eliminates the fluctuation of the intermediate bus voltage. The paper compares all solutions in terms of overall efficiency, harmonic distortion, intermediate bus voltage stress and size of the input filter under interleaved operation. The power level application target addressed in the paper is 3kW for single converter or 6kW when two converters are interleaved to provide input current ripple cancellation.