EPE Association: EPE 2001 - Topic 10g: Modelling and Simulation

EPE 2001 - Topic 10g: Modelling and Simulation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 10: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2001 - Topic 10g: Modelling and Simulation

   [return to parent folder]

   Background of Active Power Filter Control for Flicker Suppression
By J. Doležal; J. Tlustý; V. Valouch [View]
[Download]

Abstract: The paper analyses the basic input data for the design of control strategies of active filters (AF) for a flicker compensation. The basic operational characteristics for the parameters of a real distribution power system with an arc furnace and a static var compensator (SVC) have been calculated to promote the installation of an active filter for the mitigation of the voltage fluctuation. The combined application of the current SVC and the AF is a beneficial solution from the economical point of view.

   Dynamic Modeling of HVDC Converters
By W. Hammer [View]
[Download]

Abstract: A dynamic modeling approach for HVDC converters is described based on the assumption of a ripple free but varying dc current. The derived model is shown to be an extension of the conventional quasistatic model. Both models are evaluated via simulations and compared with a detailed three-phase simulation. Especially if the commutation reactance of the converter is large in relation to the dc reactance, the dynamic response of the quasi-static model significantly differs from the detailed simulation, whereas the extended model captures the converter dynamics much better.

   Harmonic Transfer Through Converters
By B. Strobl [View]
[Download]

Abstract: Using the Symmetrical Space Phasor Components, the harmonics of a periodical signal are decomposed into several groups (components). Within each group the harmonics show a similar behavior. The advantages of the Symmetrical Space Phasor Components become apparent in describing networks with time variant elements with a cyclic behavior like converters. In this case equivalent networks can be derived which show certain relationships between the components. Because of the fact that these components are sets of certain harmonics, the relationships between these groups correspond to a relationship between the harmonics in these groups. This allows for general conclusions without any assumption concerning the switching behavior or the time function of the voltage or the current. Generalized formulas describing the harmonic transfer in a converter are derived analytically. Hereby the behavior of the harmonics under special conditions is also included.

   Modelling of a DFIG Feeding a DC Load
By F.N. Okafor; W. Hofmann; B. Rabelo. [View]
[Download]

Abstract: Wind energy conversion is a fast growing technology with expanding possibilities of application. The usual problems are the stringent control specifications due to variable speed operation and the need for optimal wind speed tracking for improved efficiency. These have made the use of doubly-fed induction generators very attractive. In this paper therefore, a wind powered DFIG which feeds a DC load is investigated. It is shown that the inherent high control flexibility of the system results in optimised power flow. Electrical losses can then be minimised and system efficiency improved. Simulation studies of a prototype wind powered generator system employing a thyristor-bridge controlled DC motor, which simulates a wind turbine, as prime mover, will be presented.

   Multilevel, Multi-Cellular Structures for High-Voltage Power Conversio
By D. Gerry; P. Wheeler; J. Clare; R.J. Bassett; C. D. M. Oates; R. W. Crookes [View]
[Download]

Abstract: This paper presents an overview of multi-level, multi-cellular power-converters with emphasis on applications in the field of Transmission and Distribution. A classification system for such converter structures is proposed allowing the many topological variations to be individually identified. Converter structures are discussed with reference to this classification and their basic operating properties are identified. Converter power-flow and energy balance characteristics are discussed and the implications for different converter structures are considered.

   Study of Three-Single Phase System...
By D. Telteu; D. Grenier; F. Labrique; P. Fisette; J. Bonal [View]
[Download]

Abstract: This paper deals with the simulation of a system designed to feed a single-phase load from a threephase one without generating any unbalance. It is shown that for simulating this system, the classical method based on fixed topology fails due to simultaneous commutations in the resonant inverter. We propose therefore a new method, we call the pseudo-variable topology method, using the same ideal switch characteristic as the variable topology method but with a fixed topology.

EPE 2001 - Topic 10g: Modelling and Simulation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 10: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2001 - Topic 10g: Modelling and Simulation
	[return to parent folder]

	Background of Active Power Filter Control for Flicker Suppression By J. Doležal; J. Tlustý; V. Valouch	[View] [Download]
Abstract: The paper analyses the basic input data for the design of control strategies of active filters (AF) for a flicker compensation. The basic operational characteristics for the parameters of a real distribution power system with an arc furnace and a static var compensator (SVC) have been calculated to promote the installation of an active filter for the mitigation of the voltage fluctuation. The combined application of the current SVC and the AF is a beneficial solution from the economical point of view.

	Dynamic Modeling of HVDC Converters By W. Hammer	[View] [Download]
Abstract: A dynamic modeling approach for HVDC converters is described based on the assumption of a ripple free but varying dc current. The derived model is shown to be an extension of the conventional quasistatic model. Both models are evaluated via simulations and compared with a detailed three-phase simulation. Especially if the commutation reactance of the converter is large in relation to the dc reactance, the dynamic response of the quasi-static model significantly differs from the detailed simulation, whereas the extended model captures the converter dynamics much better.

	Harmonic Transfer Through Converters By B. Strobl	[View] [Download]
Abstract: Using the Symmetrical Space Phasor Components, the harmonics of a periodical signal are decomposed into several groups (components). Within each group the harmonics show a similar behavior. The advantages of the Symmetrical Space Phasor Components become apparent in describing networks with time variant elements with a cyclic behavior like converters. In this case equivalent networks can be derived which show certain relationships between the components. Because of the fact that these components are sets of certain harmonics, the relationships between these groups correspond to a relationship between the harmonics in these groups. This allows for general conclusions without any assumption concerning the switching behavior or the time function of the voltage or the current. Generalized formulas describing the harmonic transfer in a converter are derived analytically. Hereby the behavior of the harmonics under special conditions is also included.

	Modelling of a DFIG Feeding a DC Load By F.N. Okafor; W. Hofmann; B. Rabelo.	[View] [Download]
Abstract: Wind energy conversion is a fast growing technology with expanding possibilities of application. The usual problems are the stringent control specifications due to variable speed operation and the need for optimal wind speed tracking for improved efficiency. These have made the use of doubly-fed induction generators very attractive. In this paper therefore, a wind powered DFIG which feeds a DC load is investigated. It is shown that the inherent high control flexibility of the system results in optimised power flow. Electrical losses can then be minimised and system efficiency improved. Simulation studies of a prototype wind powered generator system employing a thyristor-bridge controlled DC motor, which simulates a wind turbine, as prime mover, will be presented.

	Multilevel, Multi-Cellular Structures for High-Voltage Power Conversio By D. Gerry; P. Wheeler; J. Clare; R.J. Bassett; C. D. M. Oates; R. W. Crookes	[View] [Download]
Abstract: This paper presents an overview of multi-level, multi-cellular power-converters with emphasis on applications in the field of Transmission and Distribution. A classification system for such converter structures is proposed allowing the many topological variations to be individually identified. Converter structures are discussed with reference to this classification and their basic operating properties are identified. Converter power-flow and energy balance characteristics are discussed and the implications for different converter structures are considered.

	Study of Three-Single Phase System... By D. Telteu; D. Grenier; F. Labrique; P. Fisette; J. Bonal	[View] [Download]
Abstract: This paper deals with the simulation of a system designed to feed a single-phase load from a threephase one without generating any unbalance. It is shown that for simulating this system, the classical method based on fixed topology fails due to simultaneous commutations in the resonant inverter. We propose therefore a new method, we call the pseudo-variable topology method, using the same ideal switch characteristic as the variable topology method but with a fixed topology.