EPE Association: EPE-PEMC 2004 - Topic 12-3: Power conditioning, power factor correction

EPE-PEMC 2004 - Topic 12-3: Power conditioning, power factor correction
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE-PEMC 2004 - Topic 12-3: Power conditioning, power factor correction

   [return to parent folder]

   A Novel Hybrid Power Quality Conditionern With UPS Function
By Pukhraj Singh, M. Pacas, Rahul Verma, Dheerendra Singh, J. B. V. Reddy [View]
[Download]

Abstract: This paper presents a power quality conditioner with UPS function consisting of series, shunt and parallel hybrid active filter with common dc link. The proposed system can provide high quality voltage to its loads under normal or abnormal utility conditions and at the same time fully compensate load harmonic and reactive power. The active filters of the proposed system are controlled in such a manner that their power rating becomes less than the active filters in conventional UPQC with UPS capability. Simulation results obtained under various operating conditions have been presented and analysed.

   Advanced Control Methods For The 3-Phase Unified Power Quality Conditioner
By Yonghua Cheng, Philippe Lataire [View]
[Download]

Abstract: Power quality can be reduced by harmonics distortion or/and fast load current flow (e.g. motor starting) on the electrical power network. A 3-phase UPQC (Unified Power Quality Conditioner) has been developed to improve the power quality and to ensure the stability. In its control system, harmonics compensation was integrated into fundamental component control (e.g. power flow control, asymmetry correction); harmonics components were identified according to the differences between the instantaneous measurements and their fundamental components. In this case, our UPQC had a very quick response of harmonics compensation, magnitude correction and power flow control. High cost efficiency and high power quality can be achieved.

   Comparison Of Voltage And Current AC-DC Inverters Working In SMES Based PCs
By B. Grzesik, T. Biskup, C. Buehrer, J. Krijgsman, J. Michalak, S. Pasko, M. Stepien, M. A. Zygmanowski [View]
[Download]

Abstract: Current and Voltage Source Inverters/Converters, working in Power Conditioning System (PCS) with energy stored in the Superconducting Magnetic Energy Storage (SMES), are described in this paper. Both topologies are investigated in respect of total installed power, the parameter that gives information about costs of the power components.

   Control System Of Power Conditioning System With Superconducting Magnetic Energy Storage In Different Operation Conditions
By Tomasz Biskup, C. Buhrer, Boguslaw Grzesik, J. Krijgsman, Jaroslaw Michalak, Szymon Pasko, Mariusz Stepien, Marcin Zygmanowski [View]
[Download]

Abstract: Control system of a Power Conditioning System (PCS) with Superconducting Magnetic Energy Storage (SMES) is described and analyzed in the paper. By means of the PCS, a high power quality can be ensured. The PCS has variable control structure that changes control strategy in different operation conditions. Operation conditions depend on occurring disturbances at the mains or load side. Some simulation and experimental results, confirming proper operation of designed control system, are presented. Results described in the paper are part of CRAFT project –HIPOLITY (5th Frame Program).

   Dynamic Improving Analysis Of Source Current Reference Generator For Power Factor Corrector
By Seigo Sasaki [View]
[Download]

Abstract: Three types of source current reference generator of power factor corrector, which contain feedforward current loops, are systematically analyzed for dynamic improvement of the corrector. Those generators have different feedforward gains in the current loops respectively, which varies against variations of a source voltage and a load. The gains are systematically analyzed.

   E-Learning For Better Understanding Of Power Quality Problems And Compensators
By P. Bauer [View]
[Download]

Abstract: E-learning with pre-solved animations can provide a better understanding of the status and different network options, compared to complex simulation or a set of equations. In this paper, examples of such animations for e-learning of different network options in a centralized or distributed power system are presented. Power electronics based compensators are introduced in the form of a new web-based, software learning tool. Power flow congestion and the impact of power electronic compensators on the system, including detailed operations of power electronic based compensators are presented. These compensators include SVCs, Active Filters, DVRs and electronic tap changers. Using these animated tools, both system level and component level operation of these devices is clearly shown.

   Feasibility Of The Daugava Hydro Power Plants Participation In Frequency Control
By Vladimir Chuvychin, Nikolay Gurov, Andris Skutelis [View]
[Download]

Abstract: Problems of the Daugava Hydro Power Plants’ (HPP) hydro units participation in frequency control in electric power system Latvenergo are considered. Plavinas and Riga HPP are equipped with different types of turbines. It causes different approach to hydro units’ application for frequency control. Main operational characteristics of hydro units are considered. Possible frequency control modes are presented for each Hydro Power Plant as well as problem of coordination of operational characteristics for two power plants.

   FPGA PLL For High Power Factor And Low Harmonics Content Active Rectifier
By Henning Holmberg, Trond Ostrem, Waldemar Sulkowski [View]
[Download]

Abstract: A design of a circuit for synchronizing a three-phase pulse width modulated voltage source inverter (PWM-VSI) to the utility grid. The inverter is used as an active four quadrant rectifier with reactive power compensation. Today, when the difference between software and hardware is less and less clear, the solutions employing software phase-locked loop (PLL) in the hardware FPGA give us a new flexible tool. The synchronizing circuit works as a PLL based on a Field Programmable Gate Array (FPGA). The main purpose is to achieve a robust and reliable syncronization circuit. Another major task is to reduce the harmonic components of the currents, due to the IEC standards, and to maximize the power factor.

   Hysteresis Current Controlled DVR With Minimized Active Power Injection
By Krzysztof Piatek [View]
[Download]

Abstract: The new DVR structure is proposed in this paper. The proposed DVR is based on the voltage inverter with the hysteresis current controller. The injected voltage is produced as a voltage drop across a resistance. The presented simulation shows, that the DVR can minimise the amount of injected active power. The control unit is much simpler than in other structures, because only the amplitude of the reference voltage has to be computed.

   Investigation Of Soft Commutation Equipment For 33 VAR Shunt Reactors
By Ivars Rankis, Andris Vilks, Oskars Plataiskalns, Aigars Vitols [View]
[Download]

Abstract: In article a thyristor control of reactors for compensation of reactive power is described. Is given some evaluations of efficiency of realizing of reactors compensation of reactive power in Nordic part of Latvian Power System. The processes in thyristor circuits are analysed and examined.

   Modified Voltage Source Active Power Filter
By Ryszard Strzelecki, Marcin Jarnut, Grzegorz Benysek [View]
[Download]

Abstract: Paper proposes modified 1-phase Voltage Source Active Power Filter (V-APF), the multiple capabilities of which include current conditioning and voltage restoring mode. Modified V-APF besides parallel voltage source and series reactance possess additional current source, connected in parallel between supply source and series reactance. The effectiveness of this arrangement is carefully outlined, while the system general performance during steady and dynamic states is intensively investigated. Experimental results of a prototype are presented to validate proposed approach..

   Network Pollution Of Power Electronic Equipment And Possible Methods Of Its Elimination
By Jozsef Borka, Miklos Horvath [View]
[Download]

Abstract: Up to our days AC networks provide the energy distribution for industrial and public consumers. But electronic consumers of increasing number require DC voltage. The network pollution is considerably growing due to the significant number of line rectifier. The DC voltage energy distribution of public network can solve this problem in the long run.

   New Concepts Of Distributed Power Generator And Dynamic Voltage Restorer
By Yonghua Cheng, Philippe Lataire [View]
[Download]

Abstract: Due to the presences of big motor frequently starting or/and other renewable energy source disconnecting/connecting, AC voltage could be highly distorted in two dimensions (phase shift and magnitude change) on the electrical power distribution network. Reactive power compensation can not correctly compensate this distortion on AC voltage. Therefore, new concepts of distributed power generator have been presented in two modes. While the power dispatching mode is achieving a constant or maximum output power from renewable energy sources, the load following mode is fast controlling the AC voltage by injecting the active power. Also the harmonics are simultaneously identified by the measurements subtracting their fundamental components, and the control system is taking account of these harmonics. A distributed power generator was prototyped and tested under grid unconnected condition. The AC voltage was completely controlled by this system in case of load current being highly distorted. The result has shown high power quality can be achieved besides the power sharing on the weak distribution networks.

   Operational Control Of Power Converter Based Distributed Generation In Local Power Supply Network
By Tetsuya Kobayashi, Jumpei Baba, Katsuhiko Shutoh, Masaaki Ohshima, Eisuke Masada [View]
[Download]

Abstract: A basic study is carried out for realizing the power conversion system control method based on automatic voltage regulation scheme to supply the ancillary services in local power supply network. Efficiency and feasibility of the proposed method are discussed by use of simulations.

   PFC Strategies In Light Of EN 61000-3-2
By Supratim Basu, M. H. J. Bollen, Tore M. Undeland [View]
[Download]

Abstract: This paper discusses the causes of input current distortion in ac-dc single-phase rectifier-capacitor filter circuits. The paper also explains the mandatory low-frequency harmonic limits of the European standard EN-61000-3-2 and the way in which these are applied to these circuits. Different power-factor correction (PFC) techniques and strategies useful for meeting this standard are explored in this paper. Simulations and measurement results are provided for some of the techniques. After providing an understanding of the Class A/D limits of the standard, the transition boundary between them is defined. The practical differences between the Class A/D limits and why it is easier to meet the Class A limits, is clearly explained. Three practical and popular power factor correction strategies are discussed. The passive PFC approach with its various advantages and disadvantages is explained. A solution to the requirement of having a variable inductance for rectifier circuits that have a variable load, towards meeting the Class A limits, is proposed. After this the low frequency active PFC is described. Lastly the popular high frequency active PFC scheme is discussed explaining its clear advantages of being able to simulate a unity power factor resistive load. This paper will add to the discussion concerning the harmonic limits by providing a number of feasible methods for limiting the harmonic distortion and complying with EN/IEC 61000-3-2 and other (future) standards.

   Power Factor Correction Of Three-Phase Diode Rectifiers Using Optimum Ripple-Power Control
By Tiiu Sakkos, Vello Sarv [View]
[Download]

Abstract: Two new efficient schemes of low-distorting threephase diode rectifiers are proposed, analyzed, and verified. The harmonic distortion reduction technique proposed is based on optimum control of the third-, sixth-, and ninth-harmonic ripple power. To improve the efficiency, the third-harmonic ripple power is re-rectified.

   Problems Of Power System Frequency Control During Emergency Condition
By Vladimir Chuvychin, Nikolay Gurov, Sergey Rubcov, Vadims Strelkovs [View]
[Download]

Abstract: Paper considers problems of frequency control during underfrequency situation in a power system. Mathematical simulation of emergency situation in the power system was performed. Analysis of frequency deviation dynamic during emergency situation showed possibility of improper operation of existing load shedding system. New suggested control method for underfrequency situation can provide tripping of the load with lower frequency decline and return the frequency to its rated value.

   Sensorless Sinusoidal Current Rectifier Supplied From Variable Frequency And Amplitude Power Source
By Krzysztof Wejrzanowski, Wlodzimierz Koczara [View]
[Download]

Abstract: Paper presents theory and test results of sensorless sinusoidal current active rectifier with controllable waveform of ac supply current. The rectifier is a source of two dc symmetrical voltages. The control system operates without ac voltage sensor and assures stable operation for a case of symmetrical and asymmetrical dc loads in wide range of the ac voltage frequency and amplitude. Simulation results and oscillograms, obtained during laboratory tests, using variable speed permanent magnet generator, confirm ability of the simple three bidirectional active switches rectifier, to control of the current that is not displaced against supplying emf.

   Sliding Mode Control And Robust Analysis Of Parallel Hybrid Filters
By S. Tnani, J. Bosche, O. Bachelier, J. P. Gaubert [View]
[Download]

Abstract: In this paper, the authors propose a novel control strategy of active hybrid filters. Sliding mode control is introduced to allow active filtering of load harmonics and active damping of passive filter connected in parallel with the active filter. When connected in power grid, the complete system is adjusted to prevent the risk of resonance as well as harmonic filtering. A complete modelling of the system is achieved and robustness of the control law is analysed. Complete simulation of the system validates efficiency of the control law.

   SVC Light: Voltage Source Converter Based Technology For Flicker Mitigation In Steel Manufacturing.
By R. Gruenbaum [View]
[Download]

Abstract: SVC Light is a new concept for efficient flicker mitigation. It comprises a fast controllable voltage source converter and a filter bank. The paper is highlighting its technology as well as its application for flicker abatement in steel plants based on electric arc furnace metallurgy. Results from flicker investigations and mitigation are shown in a recent case.

   The Influence Of Power Mains Unbalance On Parameters Of Three-Phase Bridge Rectifier With Capacitive Filter
By Martin Draessler, Jan Jirsa, Jaroslav Zacek [View]
[Download]

Abstract: This paper deals with experimental validation of the influence of power mains unbalance on properties of threephase rectifier with capacitive filter and load as one of possible reasons, which causes qualitative changes in power system. The work was made in accordance with IEC 61000-4-27:2000. The results of experimental part were compared with simulation in the second part.

   The Prototype Of A Single-Phase Dynamic Voltage Restorer
By Ondrej Viktorin, Johan Driesen, Ronnie Belmans [View]
[Download]

Abstract: This paper reports on the development and the prototyping of a single-phase dynamic voltage restorer (DVR). The primary task of this device is to keep the voltage level sufficiently high during voltage dips. The single-phase configuration requiring a minimal hardware configuration was chosen. The measurements done on the prototype confirmed proposed driving algorithms.

EPE-PEMC 2004 - Topic 12-3: Power conditioning, power factor correction
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE-PEMC 2004 - Topic 12-3: Power conditioning, power factor correction
	[return to parent folder]

	A Novel Hybrid Power Quality Conditionern With UPS Function By Pukhraj Singh, M. Pacas, Rahul Verma, Dheerendra Singh, J. B. V. Reddy	[View] [Download]
Abstract: This paper presents a power quality conditioner with UPS function consisting of series, shunt and parallel hybrid active filter with common dc link. The proposed system can provide high quality voltage to its loads under normal or abnormal utility conditions and at the same time fully compensate load harmonic and reactive power. The active filters of the proposed system are controlled in such a manner that their power rating becomes less than the active filters in conventional UPQC with UPS capability. Simulation results obtained under various operating conditions have been presented and analysed.

	Advanced Control Methods For The 3-Phase Unified Power Quality Conditioner By Yonghua Cheng, Philippe Lataire	[View] [Download]
Abstract: Power quality can be reduced by harmonics distortion or/and fast load current flow (e.g. motor starting) on the electrical power network. A 3-phase UPQC (Unified Power Quality Conditioner) has been developed to improve the power quality and to ensure the stability. In its control system, harmonics compensation was integrated into fundamental component control (e.g. power flow control, asymmetry correction); harmonics components were identified according to the differences between the instantaneous measurements and their fundamental components. In this case, our UPQC had a very quick response of harmonics compensation, magnitude correction and power flow control. High cost efficiency and high power quality can be achieved.

	Comparison Of Voltage And Current AC-DC Inverters Working In SMES Based PCs By B. Grzesik, T. Biskup, C. Buehrer, J. Krijgsman, J. Michalak, S. Pasko, M. Stepien, M. A. Zygmanowski	[View] [Download]
Abstract: Current and Voltage Source Inverters/Converters, working in Power Conditioning System (PCS) with energy stored in the Superconducting Magnetic Energy Storage (SMES), are described in this paper. Both topologies are investigated in respect of total installed power, the parameter that gives information about costs of the power components.

	Control System Of Power Conditioning System With Superconducting Magnetic Energy Storage In Different Operation Conditions By Tomasz Biskup, C. Buhrer, Boguslaw Grzesik, J. Krijgsman, Jaroslaw Michalak, Szymon Pasko, Mariusz Stepien, Marcin Zygmanowski	[View] [Download]
Abstract: Control system of a Power Conditioning System (PCS) with Superconducting Magnetic Energy Storage (SMES) is described and analyzed in the paper. By means of the PCS, a high power quality can be ensured. The PCS has variable control structure that changes control strategy in different operation conditions. Operation conditions depend on occurring disturbances at the mains or load side. Some simulation and experimental results, confirming proper operation of designed control system, are presented. Results described in the paper are part of CRAFT project –HIPOLITY (5th Frame Program).

	Dynamic Improving Analysis Of Source Current Reference Generator For Power Factor Corrector By Seigo Sasaki	[View] [Download]
Abstract: Three types of source current reference generator of power factor corrector, which contain feedforward current loops, are systematically analyzed for dynamic improvement of the corrector. Those generators have different feedforward gains in the current loops respectively, which varies against variations of a source voltage and a load. The gains are systematically analyzed.

	E-Learning For Better Understanding Of Power Quality Problems And Compensators By P. Bauer	[View] [Download]
Abstract: E-learning with pre-solved animations can provide a better understanding of the status and different network options, compared to complex simulation or a set of equations. In this paper, examples of such animations for e-learning of different network options in a centralized or distributed power system are presented. Power electronics based compensators are introduced in the form of a new web-based, software learning tool. Power flow congestion and the impact of power electronic compensators on the system, including detailed operations of power electronic based compensators are presented. These compensators include SVCs, Active Filters, DVRs and electronic tap changers. Using these animated tools, both system level and component level operation of these devices is clearly shown.

	Feasibility Of The Daugava Hydro Power Plants Participation In Frequency Control By Vladimir Chuvychin, Nikolay Gurov, Andris Skutelis	[View] [Download]
Abstract: Problems of the Daugava Hydro Power Plants’ (HPP) hydro units participation in frequency control in electric power system Latvenergo are considered. Plavinas and Riga HPP are equipped with different types of turbines. It causes different approach to hydro units’ application for frequency control. Main operational characteristics of hydro units are considered. Possible frequency control modes are presented for each Hydro Power Plant as well as problem of coordination of operational characteristics for two power plants.

	FPGA PLL For High Power Factor And Low Harmonics Content Active Rectifier By Henning Holmberg, Trond Ostrem, Waldemar Sulkowski	[View] [Download]
Abstract: A design of a circuit for synchronizing a three-phase pulse width modulated voltage source inverter (PWM-VSI) to the utility grid. The inverter is used as an active four quadrant rectifier with reactive power compensation. Today, when the difference between software and hardware is less and less clear, the solutions employing software phase-locked loop (PLL) in the hardware FPGA give us a new flexible tool. The synchronizing circuit works as a PLL based on a Field Programmable Gate Array (FPGA). The main purpose is to achieve a robust and reliable syncronization circuit. Another major task is to reduce the harmonic components of the currents, due to the IEC standards, and to maximize the power factor.

	Hysteresis Current Controlled DVR With Minimized Active Power Injection By Krzysztof Piatek	[View] [Download]
Abstract: The new DVR structure is proposed in this paper. The proposed DVR is based on the voltage inverter with the hysteresis current controller. The injected voltage is produced as a voltage drop across a resistance. The presented simulation shows, that the DVR can minimise the amount of injected active power. The control unit is much simpler than in other structures, because only the amplitude of the reference voltage has to be computed.

	Investigation Of Soft Commutation Equipment For 33 VAR Shunt Reactors By Ivars Rankis, Andris Vilks, Oskars Plataiskalns, Aigars Vitols	[View] [Download]
Abstract: In article a thyristor control of reactors for compensation of reactive power is described. Is given some evaluations of efficiency of realizing of reactors compensation of reactive power in Nordic part of Latvian Power System. The processes in thyristor circuits are analysed and examined.

	Modified Voltage Source Active Power Filter By Ryszard Strzelecki, Marcin Jarnut, Grzegorz Benysek	[View] [Download]
Abstract: Paper proposes modified 1-phase Voltage Source Active Power Filter (V-APF), the multiple capabilities of which include current conditioning and voltage restoring mode. Modified V-APF besides parallel voltage source and series reactance possess additional current source, connected in parallel between supply source and series reactance. The effectiveness of this arrangement is carefully outlined, while the system general performance during steady and dynamic states is intensively investigated. Experimental results of a prototype are presented to validate proposed approach..

	Network Pollution Of Power Electronic Equipment And Possible Methods Of Its Elimination By Jozsef Borka, Miklos Horvath	[View] [Download]
Abstract: Up to our days AC networks provide the energy distribution for industrial and public consumers. But electronic consumers of increasing number require DC voltage. The network pollution is considerably growing due to the significant number of line rectifier. The DC voltage energy distribution of public network can solve this problem in the long run.

	New Concepts Of Distributed Power Generator And Dynamic Voltage Restorer By Yonghua Cheng, Philippe Lataire	[View] [Download]
Abstract: Due to the presences of big motor frequently starting or/and other renewable energy source disconnecting/connecting, AC voltage could be highly distorted in two dimensions (phase shift and magnitude change) on the electrical power distribution network. Reactive power compensation can not correctly compensate this distortion on AC voltage. Therefore, new concepts of distributed power generator have been presented in two modes. While the power dispatching mode is achieving a constant or maximum output power from renewable energy sources, the load following mode is fast controlling the AC voltage by injecting the active power. Also the harmonics are simultaneously identified by the measurements subtracting their fundamental components, and the control system is taking account of these harmonics. A distributed power generator was prototyped and tested under grid unconnected condition. The AC voltage was completely controlled by this system in case of load current being highly distorted. The result has shown high power quality can be achieved besides the power sharing on the weak distribution networks.

	Operational Control Of Power Converter Based Distributed Generation In Local Power Supply Network By Tetsuya Kobayashi, Jumpei Baba, Katsuhiko Shutoh, Masaaki Ohshima, Eisuke Masada	[View] [Download]
Abstract: A basic study is carried out for realizing the power conversion system control method based on automatic voltage regulation scheme to supply the ancillary services in local power supply network. Efficiency and feasibility of the proposed method are discussed by use of simulations.

	PFC Strategies In Light Of EN 61000-3-2 By Supratim Basu, M. H. J. Bollen, Tore M. Undeland	[View] [Download]
Abstract: This paper discusses the causes of input current distortion in ac-dc single-phase rectifier-capacitor filter circuits. The paper also explains the mandatory low-frequency harmonic limits of the European standard EN-61000-3-2 and the way in which these are applied to these circuits. Different power-factor correction (PFC) techniques and strategies useful for meeting this standard are explored in this paper. Simulations and measurement results are provided for some of the techniques. After providing an understanding of the Class A/D limits of the standard, the transition boundary between them is defined. The practical differences between the Class A/D limits and why it is easier to meet the Class A limits, is clearly explained. Three practical and popular power factor correction strategies are discussed. The passive PFC approach with its various advantages and disadvantages is explained. A solution to the requirement of having a variable inductance for rectifier circuits that have a variable load, towards meeting the Class A limits, is proposed. After this the low frequency active PFC is described. Lastly the popular high frequency active PFC scheme is discussed explaining its clear advantages of being able to simulate a unity power factor resistive load. This paper will add to the discussion concerning the harmonic limits by providing a number of feasible methods for limiting the harmonic distortion and complying with EN/IEC 61000-3-2 and other (future) standards.

	Power Factor Correction Of Three-Phase Diode Rectifiers Using Optimum Ripple-Power Control By Tiiu Sakkos, Vello Sarv	[View] [Download]
Abstract: Two new efficient schemes of low-distorting threephase diode rectifiers are proposed, analyzed, and verified. The harmonic distortion reduction technique proposed is based on optimum control of the third-, sixth-, and ninth-harmonic ripple power. To improve the efficiency, the third-harmonic ripple power is re-rectified.

	Problems Of Power System Frequency Control During Emergency Condition By Vladimir Chuvychin, Nikolay Gurov, Sergey Rubcov, Vadims Strelkovs	[View] [Download]
Abstract: Paper considers problems of frequency control during underfrequency situation in a power system. Mathematical simulation of emergency situation in the power system was performed. Analysis of frequency deviation dynamic during emergency situation showed possibility of improper operation of existing load shedding system. New suggested control method for underfrequency situation can provide tripping of the load with lower frequency decline and return the frequency to its rated value.

	Sensorless Sinusoidal Current Rectifier Supplied From Variable Frequency And Amplitude Power Source By Krzysztof Wejrzanowski, Wlodzimierz Koczara	[View] [Download]
Abstract: Paper presents theory and test results of sensorless sinusoidal current active rectifier with controllable waveform of ac supply current. The rectifier is a source of two dc symmetrical voltages. The control system operates without ac voltage sensor and assures stable operation for a case of symmetrical and asymmetrical dc loads in wide range of the ac voltage frequency and amplitude. Simulation results and oscillograms, obtained during laboratory tests, using variable speed permanent magnet generator, confirm ability of the simple three bidirectional active switches rectifier, to control of the current that is not displaced against supplying emf.

	Sliding Mode Control And Robust Analysis Of Parallel Hybrid Filters By S. Tnani, J. Bosche, O. Bachelier, J. P. Gaubert	[View] [Download]
Abstract: In this paper, the authors propose a novel control strategy of active hybrid filters. Sliding mode control is introduced to allow active filtering of load harmonics and active damping of passive filter connected in parallel with the active filter. When connected in power grid, the complete system is adjusted to prevent the risk of resonance as well as harmonic filtering. A complete modelling of the system is achieved and robustness of the control law is analysed. Complete simulation of the system validates efficiency of the control law.

	SVC Light: Voltage Source Converter Based Technology For Flicker Mitigation In Steel Manufacturing. By R. Gruenbaum	[View] [Download]
Abstract: SVC Light is a new concept for efficient flicker mitigation. It comprises a fast controllable voltage source converter and a filter bank. The paper is highlighting its technology as well as its application for flicker abatement in steel plants based on electric arc furnace metallurgy. Results from flicker investigations and mitigation are shown in a recent case.

	The Influence Of Power Mains Unbalance On Parameters Of Three-Phase Bridge Rectifier With Capacitive Filter By Martin Draessler, Jan Jirsa, Jaroslav Zacek	[View] [Download]
Abstract: This paper deals with experimental validation of the influence of power mains unbalance on properties of threephase rectifier with capacitive filter and load as one of possible reasons, which causes qualitative changes in power system. The work was made in accordance with IEC 61000-4-27:2000. The results of experimental part were compared with simulation in the second part.

	The Prototype Of A Single-Phase Dynamic Voltage Restorer By Ondrej Viktorin, Johan Driesen, Ronnie Belmans	[View] [Download]
Abstract: This paper reports on the development and the prototyping of a single-phase dynamic voltage restorer (DVR). The primary task of this device is to keep the voltage level sufficiently high during voltage dips. The single-phase configuration requiring a minimal hardware configuration was chosen. The measurements done on the prototype confirmed proposed driving algorithms.