2008 Power Quality and Supply Reliability Conference, 2008
In this paper, analyzed hybrid UPQC systems consist of the series and parallel APF with added res... more In this paper, analyzed hybrid UPQC systems consist of the series and parallel APF with added resonance filter LC. The authors focus on analysis of the power flow between active filters at different configurations. This problem is significant, because it makes possible to find optimum configuration of the hybrid UPFC and power of the additional sources elements. Presented systems differ
Układy pomiaru i stabilizacji grubości folii wytwarzanej metodą wytłaczania z rozdmuchiwaniem SYS... more Układy pomiaru i stabilizacji grubości folii wytwarzanej metodą wytłaczania z rozdmuchiwaniem SYSTEMS FOR THE MEASUREMENT AND STABILIZATION OF FILM THICKNESS IN THE BLOWN-FILM EXTRUSION PROCESS Summary-The methods for measuring the film thickness used currently in the tubular polyethylene film blowing process were discussed. The capa citance, ultrasonic and isotopic methods and block diagrams of the measuring devices were presented. Typical systems used for stabilizing the film thickness were also discussed-they were subdivided into systems for stabilizing the average film thickness and those for stabilizing the film thickness along the tube perimeter. As particular examples served: setting of the average film thickness by a system stabilizing the raw material unit consumption (mass dosing) and two types of thermal tube centering systems (with a segmented heating and with a segmented cooling system).
Abstract-This paper presents an optimization possibility of the voltage-fed continuous input curr... more Abstract-This paper presents an optimization possibility of the voltage-fed continuous input current quasi-impedance source inverter (qZSI) by the introduction of the two-stage quasi-Z-source network (qZS-network). The two-stage qZS-network could be derived by the adding of ...
2008 International School on Nonsinusoidal Currents and Compensation, 2008
The paper presents the control system of shunt active power filter (APF) with predictive referenc... more The paper presents the control system of shunt active power filter (APF) with predictive reference current calculation and model based predictive current control. The novel estimator and predictor of grid EMF is proposed for AC voltage sensorless operation of APF. Proposed control system provides control of APF current with high precision and dynamics limited only by filter circuit parameters. There are presented experimental results achieved for 50 kVA APF and simulation results for design of the 2 MVA APF.
2008 International School on Nonsinusoidal Currents and Compensation, 2008
The paper introduces power quality conditioners with minimum number of current sensors. The power... more The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.
2007 9th International Conference on Electrical Power Quality and Utilisation, 2007
The paper presents the single phase uninterruptible power supply (UPS) system with galvanic separ... more The paper presents the single phase uninterruptible power supply (UPS) system with galvanic separated DC-AC-DC-AC converters operating in parallel. The CAN physical layer based system of communication between converters has been developed and applied, which allow to utilize a decentralized master-slave control providing high availability factor of the whole UPS system. The control system of particular converters has been developed
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 1997
Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a... more Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a non‐linear variable load occur. The operation of two hybrid filter systems, each equipped with an active power filter, working as: a) a controlled additional current source, b) a controlled additional voltage source, recognized by the authors in previous publications as the most advantageous solution has been examined. For both systems, vectorial equations in α,β co‐ordinates, describing their operation, have been presented. On the basis of these equations a common frequency model of three‐phase three‐wire hybrid filters has been elaborated. This model has been used for the evaluation of the filtration efficiency of line current harmonics, taking into consideration the applied methods and algorithms to separate filtered harmonics, above all at a pulsating load current. Some conclusions from the theoretical analysis have been verified by simulation of a line loaded by converter with an o...
Bulletin of the Polish Academy of Sciences: Technical Sciences, 2011
Power electronic systems as a crucial part of Smart Grid infrastructure - a surveyThis article gi... more Power electronic systems as a crucial part of Smart Grid infrastructure - a surveyThis article gives a tutorial overview of the most important issues related to the use of power electronic systems in power engineering, with respect to the urgent need for modernization of existing grids in the direction of intelligent networks. The main problems and conditions bound up with the construction of Smart Grids and the location, as well as functioning in them of the most important power electronic systems are presented here. Special attention is directed therein to the potential possibilities of so-called ‘smart’ transformers and V2G and V2H technologies.
2008 Power Quality and Supply Reliability Conference, 2008
In this paper, analyzed hybrid UPQC systems consist of the series and parallel APF with added res... more In this paper, analyzed hybrid UPQC systems consist of the series and parallel APF with added resonance filter LC. The authors focus on analysis of the power flow between active filters at different configurations. This problem is significant, because it makes possible to find optimum configuration of the hybrid UPFC and power of the additional sources elements. Presented systems differ
Układy pomiaru i stabilizacji grubości folii wytwarzanej metodą wytłaczania z rozdmuchiwaniem SYS... more Układy pomiaru i stabilizacji grubości folii wytwarzanej metodą wytłaczania z rozdmuchiwaniem SYSTEMS FOR THE MEASUREMENT AND STABILIZATION OF FILM THICKNESS IN THE BLOWN-FILM EXTRUSION PROCESS Summary-The methods for measuring the film thickness used currently in the tubular polyethylene film blowing process were discussed. The capa citance, ultrasonic and isotopic methods and block diagrams of the measuring devices were presented. Typical systems used for stabilizing the film thickness were also discussed-they were subdivided into systems for stabilizing the average film thickness and those for stabilizing the film thickness along the tube perimeter. As particular examples served: setting of the average film thickness by a system stabilizing the raw material unit consumption (mass dosing) and two types of thermal tube centering systems (with a segmented heating and with a segmented cooling system).
Abstract-This paper presents an optimization possibility of the voltage-fed continuous input curr... more Abstract-This paper presents an optimization possibility of the voltage-fed continuous input current quasi-impedance source inverter (qZSI) by the introduction of the two-stage quasi-Z-source network (qZS-network). The two-stage qZS-network could be derived by the adding of ...
2008 International School on Nonsinusoidal Currents and Compensation, 2008
The paper presents the control system of shunt active power filter (APF) with predictive referenc... more The paper presents the control system of shunt active power filter (APF) with predictive reference current calculation and model based predictive current control. The novel estimator and predictor of grid EMF is proposed for AC voltage sensorless operation of APF. Proposed control system provides control of APF current with high precision and dynamics limited only by filter circuit parameters. There are presented experimental results achieved for 50 kVA APF and simulation results for design of the 2 MVA APF.
2008 International School on Nonsinusoidal Currents and Compensation, 2008
The paper introduces power quality conditioners with minimum number of current sensors. The power... more The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.
2007 9th International Conference on Electrical Power Quality and Utilisation, 2007
The paper presents the single phase uninterruptible power supply (UPS) system with galvanic separ... more The paper presents the single phase uninterruptible power supply (UPS) system with galvanic separated DC-AC-DC-AC converters operating in parallel. The CAN physical layer based system of communication between converters has been developed and applied, which allow to utilize a decentralized master-slave control providing high availability factor of the whole UPS system. The control system of particular converters has been developed
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 1997
Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a... more Examines some basic aspects of hybrid filters, operating effectively when current pulsations of a non‐linear variable load occur. The operation of two hybrid filter systems, each equipped with an active power filter, working as: a) a controlled additional current source, b) a controlled additional voltage source, recognized by the authors in previous publications as the most advantageous solution has been examined. For both systems, vectorial equations in α,β co‐ordinates, describing their operation, have been presented. On the basis of these equations a common frequency model of three‐phase three‐wire hybrid filters has been elaborated. This model has been used for the evaluation of the filtration efficiency of line current harmonics, taking into consideration the applied methods and algorithms to separate filtered harmonics, above all at a pulsating load current. Some conclusions from the theoretical analysis have been verified by simulation of a line loaded by converter with an o...
Bulletin of the Polish Academy of Sciences: Technical Sciences, 2011
Power electronic systems as a crucial part of Smart Grid infrastructure - a surveyThis article gi... more Power electronic systems as a crucial part of Smart Grid infrastructure - a surveyThis article gives a tutorial overview of the most important issues related to the use of power electronic systems in power engineering, with respect to the urgent need for modernization of existing grids in the direction of intelligent networks. The main problems and conditions bound up with the construction of Smart Grids and the location, as well as functioning in them of the most important power electronic systems are presented here. Special attention is directed therein to the potential possibilities of so-called ‘smart’ transformers and V2G and V2H technologies.
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Papers by R. Strzelecki