EPE Association: EPE 1999 - Topic 09: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION

EPE 1999 - Topic 09: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 09: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION

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   EPE 1999 - Topic 09a: Renewable Energy Systems

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Renewable Energy Systems"

   EPE 1999 - Topic 09b: HVDC

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "HVDC"

   EPE 1999 - Topic 09c: FACTS

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "FACTS"

   EPE 1999 - Topic 09d: Active Filters and Harmonics

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Active Filters and Harmonics"

   EPE 1999 - Topic 09e: Adjustable Speed Generation Systems

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Adjustable Speed Generation Systems"

   EPE 1999 - Topic 09f: Generator Excitation Systems

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Generator Excitation Systems"

   EPE 1999 - Topic 09g: Modelling and Simulation

In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Modelling and Simulation"

   Evaluation of a New Controller for a Shunt Active DC Power Filter in HVDC Systems
By H. N. Holtzhausen; J. H. R. Enslin [View]
[Download]

Abstract: The thyristor bridges of the HVDC system generate harmonics on the AC and DC side of the converter station. The DC-side voltage harmonics cause harmonic currents that couple with adjacent telephone lines and induce interference on them. Active DC-side filters are commonly used with the passive filters (in hybrid configurations) to improve the quality and flexibility of filtering. This paper introduces a new algorithm for the control of active DC-side filters and compares it with an existing feedback controller. Practical results of a scale model implementation of the new controller presented. To conclude, the findings of the paper are summarized and future work in the field of HVDC active filter control is discussed.

   Generation of Harmonics in Voltage- and Current-source-rectifiers
By A. Rafoth; D. Machost; J. Petzoldt; A. Schluss [View]
[Download]

Abstract: This paper will present a theoretical approach to describe the production of harmonics in voltage and current-source rectifiers/inverters (VSI, CSI). The used models describe ideal switching behavior, a switch-on or switch-off delay and a variety of control principles. The results are compared to practice. The experimental set-up is presented. For the postprocessing of the calculated and measured data the same algorithm is used. It is based on a Fourier-Transformation and a grouping procedure that summarises a number of spectrum lines. Special attention is payed to the comparison of simulated and experimental results.

   Hybrid Transformerless Reactive Series Compensators
By A. Beer; H. Stemmler; H. Okayama [View]
[Download]

Abstract: We propose a hybrid series compensator for power flow control with increased control range and reduced inverter capacity. For cost reduction the compensator is directly connected to the AC system without using costly and bulky transformers. Experimental results like start-up without DC-precharging and transition from capacitive to inductive compensation demonstrate the feasibility and functionality.

   Improving the Performance of a Rotating System Tie Frequency Converter Control
By M. Lampersberger; H. Weiss; P. Ebner; A. Schmidhofer [View]
[Download]

Abstract: The single phase 16.7 Hz railway supply network in central Europe has no fixed frequency ratio to the public 50 Hz three phase mains. For this 16.7 Hz mains a frequency deviation to the 50 Hz line of -3.5% to 2.5% is the design basis for the system tie frequency converters. System tie frequency converters take part in power delivering into railway mains, especially for the controlling power, in order to hold the single phase frequency at its setpoint value. In this network some static system tie converters (Giubiasco, Muldenstein/Gebersdorf, Jübek, Bremen) are already in operation for the last years. A major power contribution is given by the rotating system tie converters, consisting of a three-phase induction machine and a single phase synchronous machine in power ranges of approx. 7.5 MW to 70 MW per unit. State of the art systems with rotating machines are composed of a relative small power converterr with GTO-PWM inverter in the rotor circuit of the three phase induction machine. The dynamic performance of the rotor circuit can be improved by new control strategies. For such a supply system a stable, robust and fail-safe restectively failure-surviving system is essential. Especially the DC voltage control system shall guarantee a constant voltage without excessive oscillations during load variations and without deviation from the setpoint value during the change of non-internittent to intermittent condition of the DC link current.

   Non-linear Passivity Approach Applied to a Three Phase Active Shunt Power Filter
By V. Cardenas; M. oliver; N. Vasairo; S. Ramirez; C. Nunez; H. Sira-Ramirez [View]
[Download]

Abstract: This paper presents a three-phase shunt active power filter controlled by the non-linear passivity technique. the dissipative features in which the passivity technique is based on allow the development of a non-linear controller having a good dynamical response, robustness and stability. The control circuit is based on a DSP. Analysis and modeling are presented as well as simulation and experimental results, which verify the satisfactory of the proposed approach.

   Power Flow in Typical Topologies of the Series-Parallel Hybrid Filters
By R. Strzelecki; L. Frackowiak; G. Benysek; J. Rusinski [View]
[Download]

Abstract: In this paper hybrid UPQc systems are anlyzed, which consists from the series and parallel APF with added resonance filter LC. Authors of this paper in peculiarities occupy oneself with analysis power flow between both active filters at different configurations. This problem is according to the authors very important, because it makes possible to find optimum configuration of the hybrid UPFC and power of the additional sources elements. Presented systems are different between oneself in respect of flow and values of the additional sources power.

   Protection of the Modified HVDC Converters Using an Ultra Fast Hybrid Circuit Breaker
By S. Hasan; M. M. Atout; S. M. S. Al-Dhalan [View]
[Download]

Abstract: Mechanical fast-acting current limiting DC circuit breakers are generally used to protect converters and DC power supply systems from short circuit conditions. However, the outstanding properties of modern hybrid current limiting and interrupting circuit breaker (HCB) have been designed to protect many variety of shorted circuits. One of the most interesting applications of the HCB is the fast interruption of the short-circuit currents throughout the modified high voltage DC converters (HVDCC). The principles of the short-circuit current limiting features inside the modified HVDCC using an ultra fast HCB are described. It has been shown in the paper that a new approach for the short-circuit protection of HVDCC would be possible and some of the mechanical circuit breaker shortcomings have been solved. operation of the HCB protection at fault current interruption in the modified HVDCC is illustrated by voltage and current wave forms, obtained from computer simulations.

   Sliding Mode Control for Active Filtering with Improvement of the High Frequency Range Spectrum
By S. Guffon; A. Sariñana; S. Bacha; J. Davoine [View]
[Download]

Abstract: This paper deals with sliding mode control of a three-phase voltage source inverter working as an active filter. Several methods are proposed to improve the high frequency range spectrum of the current after compensation. The performance of the proposed sliding mode controller operating at limited and fixed switching frequency is compared with PWM technique.

   The Use of UPFC for Unbalance Compensation of Electrical System
By K. Belacheheb; S. Saadate [View]
[Download]

Abstract: Voltage unbalance typically present in three phase alternative current supply adversely affects power system components connected to the system. This voltage unbalance is generally corrected indirectly by using a shunt compensator. This paper proposes a new method to compensate this unbalance by means of a UPFC series device which is connected to the power supply through transformers. Besides, the harmonic pollution generated by the device will also be filtered. This unbalance compensation is achieved by canceling the zero and negative sequence component of the line voltage. A comparison, in term of power rating, with the shunt compensator is also performed.

EPE 1999 - Topic 09: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1999 - Conference > EPE 1999 - Topic 09: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION
	[return to parent folder]

	EPE 1999 - Topic 09a: Renewable Energy Systems
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Renewable Energy Systems"
	EPE 1999 - Topic 09b: HVDC
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "HVDC"
	EPE 1999 - Topic 09c: FACTS
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "FACTS"
	EPE 1999 - Topic 09d: Active Filters and Harmonics
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Active Filters and Harmonics"
	EPE 1999 - Topic 09e: Adjustable Speed Generation Systems
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Adjustable Speed Generation Systems"
	EPE 1999 - Topic 09f: Generator Excitation Systems
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Generator Excitation Systems"
	EPE 1999 - Topic 09g: Modelling and Simulation
In this category, the user will find the papers which were presented during the EPE 1999 Conference, related to "Modelling and Simulation"

	Evaluation of a New Controller for a Shunt Active DC Power Filter in HVDC Systems By H. N. Holtzhausen; J. H. R. Enslin	[View] [Download]
Abstract: The thyristor bridges of the HVDC system generate harmonics on the AC and DC side of the converter station. The DC-side voltage harmonics cause harmonic currents that couple with adjacent telephone lines and induce interference on them. Active DC-side filters are commonly used with the passive filters (in hybrid configurations) to improve the quality and flexibility of filtering. This paper introduces a new algorithm for the control of active DC-side filters and compares it with an existing feedback controller. Practical results of a scale model implementation of the new controller presented. To conclude, the findings of the paper are summarized and future work in the field of HVDC active filter control is discussed.

	Generation of Harmonics in Voltage- and Current-source-rectifiers By A. Rafoth; D. Machost; J. Petzoldt; A. Schluss	[View] [Download]
Abstract: This paper will present a theoretical approach to describe the production of harmonics in voltage and current-source rectifiers/inverters (VSI, CSI). The used models describe ideal switching behavior, a switch-on or switch-off delay and a variety of control principles. The results are compared to practice. The experimental set-up is presented. For the postprocessing of the calculated and measured data the same algorithm is used. It is based on a Fourier-Transformation and a grouping procedure that summarises a number of spectrum lines. Special attention is payed to the comparison of simulated and experimental results.

	Hybrid Transformerless Reactive Series Compensators By A. Beer; H. Stemmler; H. Okayama	[View] [Download]
Abstract: We propose a hybrid series compensator for power flow control with increased control range and reduced inverter capacity. For cost reduction the compensator is directly connected to the AC system without using costly and bulky transformers. Experimental results like start-up without DC-precharging and transition from capacitive to inductive compensation demonstrate the feasibility and functionality.

	Improving the Performance of a Rotating System Tie Frequency Converter Control By M. Lampersberger; H. Weiss; P. Ebner; A. Schmidhofer	[View] [Download]
Abstract: The single phase 16.7 Hz railway supply network in central Europe has no fixed frequency ratio to the public 50 Hz three phase mains. For this 16.7 Hz mains a frequency deviation to the 50 Hz line of -3.5% to 2.5% is the design basis for the system tie frequency converters. System tie frequency converters take part in power delivering into railway mains, especially for the controlling power, in order to hold the single phase frequency at its setpoint value. In this network some static system tie converters (Giubiasco, Muldenstein/Gebersdorf, Jübek, Bremen) are already in operation for the last years. A major power contribution is given by the rotating system tie converters, consisting of a three-phase induction machine and a single phase synchronous machine in power ranges of approx. 7.5 MW to 70 MW per unit. State of the art systems with rotating machines are composed of a relative small power converterr with GTO-PWM inverter in the rotor circuit of the three phase induction machine. The dynamic performance of the rotor circuit can be improved by new control strategies. For such a supply system a stable, robust and fail-safe restectively failure-surviving system is essential. Especially the DC voltage control system shall guarantee a constant voltage without excessive oscillations during load variations and without deviation from the setpoint value during the change of non-internittent to intermittent condition of the DC link current.

	Non-linear Passivity Approach Applied to a Three Phase Active Shunt Power Filter By V. Cardenas; M. oliver; N. Vasairo; S. Ramirez; C. Nunez; H. Sira-Ramirez	[View] [Download]
Abstract: This paper presents a three-phase shunt active power filter controlled by the non-linear passivity technique. the dissipative features in which the passivity technique is based on allow the development of a non-linear controller having a good dynamical response, robustness and stability. The control circuit is based on a DSP. Analysis and modeling are presented as well as simulation and experimental results, which verify the satisfactory of the proposed approach.

	Power Flow in Typical Topologies of the Series-Parallel Hybrid Filters By R. Strzelecki; L. Frackowiak; G. Benysek; J. Rusinski	[View] [Download]
Abstract: In this paper hybrid UPQc systems are anlyzed, which consists from the series and parallel APF with added resonance filter LC. Authors of this paper in peculiarities occupy oneself with analysis power flow between both active filters at different configurations. This problem is according to the authors very important, because it makes possible to find optimum configuration of the hybrid UPFC and power of the additional sources elements. Presented systems are different between oneself in respect of flow and values of the additional sources power.

	Protection of the Modified HVDC Converters Using an Ultra Fast Hybrid Circuit Breaker By S. Hasan; M. M. Atout; S. M. S. Al-Dhalan	[View] [Download]
Abstract: Mechanical fast-acting current limiting DC circuit breakers are generally used to protect converters and DC power supply systems from short circuit conditions. However, the outstanding properties of modern hybrid current limiting and interrupting circuit breaker (HCB) have been designed to protect many variety of shorted circuits. One of the most interesting applications of the HCB is the fast interruption of the short-circuit currents throughout the modified high voltage DC converters (HVDCC). The principles of the short-circuit current limiting features inside the modified HVDCC using an ultra fast HCB are described. It has been shown in the paper that a new approach for the short-circuit protection of HVDCC would be possible and some of the mechanical circuit breaker shortcomings have been solved. operation of the HCB protection at fault current interruption in the modified HVDCC is illustrated by voltage and current wave forms, obtained from computer simulations.

	Sliding Mode Control for Active Filtering with Improvement of the High Frequency Range Spectrum By S. Guffon; A. Sariñana; S. Bacha; J. Davoine	[View] [Download]
Abstract: This paper deals with sliding mode control of a three-phase voltage source inverter working as an active filter. Several methods are proposed to improve the high frequency range spectrum of the current after compensation. The performance of the proposed sliding mode controller operating at limited and fixed switching frequency is compared with PWM technique.

	The Use of UPFC for Unbalance Compensation of Electrical System By K. Belacheheb; S. Saadate	[View] [Download]
Abstract: Voltage unbalance typically present in three phase alternative current supply adversely affects power system components connected to the system. This voltage unbalance is generally corrected indirectly by using a shunt compensator. This paper proposes a new method to compensate this unbalance by means of a UPFC series device which is connected to the power supply through transformers. Besides, the harmonic pollution generated by the device will also be filtered. This unbalance compensation is achieved by canceling the zero and negative sequence component of the line voltage. A comparison, in term of power rating, with the shunt compensator is also performed.