EPE Association: EPE 2011 - DS3b: Topic 03: Power System Integration

EPE 2011 - DS3b: Topic 03: Power System Integration
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 03: Power System Integration > EPE 2011 - DS3b: Topic 03: Power System Integration

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   A Review of Parallel Operation of Active Power Filters in the Distributed Generation System
By MD Shafiuzzaman Khan KHADEM, Malabika BASU, Michael CONLON [View]
[Download]

Abstract: In this paper a technical review of parallel operation of Active Power Filter (APF) for harmonic powercompensation in distributed generation (DG) network has been presented. Controlling methods andconnection topologies with their pros and cons are described. Recent improvements in controlling andfuture trends for the application of APFs in distributed mode are also identified.

   Control Scheme of Three-level H-bridge Converter for Interfacing Between Renewable Energy Resources and AC Grid
By Edris POURESMAEIL, Daniel MONTESINOS-MIRACLE, Oriol GOMIS-BELLMUNT [View]
[Download]

Abstract: This paper presents a control strategy of multilevel converters for integration of renewable energy resources into power grid. The proposed technique provides compensation for active, reactive, and harmonic current components of grid-connected loads. A three-level H-bridge converter is proposed as the interfacing system between renewable energy resources and utility grid. High performance of the proposed technique is indicated with injection of maximum available power from renewable energy resources to the power grid, increases power factor of the utility grid, and reduces the total harmonic distortion (THD) of grid current through Matlab/Simulink under proposed operating conditions.

   Electro-thermal modelling of three phase inverter
By Hui HUANG, Philip MAWBY, Angus BRYANT [View]
[Download]

Abstract: This paper introduces an electro-thermal model of an inverter implemented in PLECS. This model is ableto calculate IGBT junction temperature with a mission profile. Look up tables (LUT) of switching powerloss are generated by running physics-based IGBT and diode models under different operating conditions. The inverter model interpolates power dissipation from the LUTs to speed up the simulation rather than running the physics-based device model, which is relatively slow. The thermal network is extracted from the heating curves of IGBT junction and case temperature which are measured on a power cycling rig. Junction temperature under operating condition is obtained with the power dissipation and thermal network. Although the work presented here is general applicable to any converter applications, our particular emphasis in this paper is on renewable energy system such as wind power applications. This model extends the current available inverter model[1] which is fixed frequency and voltage to various frequency and voltage which is more closely aligned with the operation of wind turbine.

   FlePs: a power interface for Power Hardware In the Loop
By Andrea BENIGNI, Alexander HELMEDAG, Adil ABDALRAHMAN, Grzegorz PILATOWICZ, Antonello MONTI [View]
[Download]

Abstract: Power Hardware In the Loop (PHIL) is a recognized technique to extend Hardware In the Loop tests to power level by enforcing conservation of energy at the connection between real and virtual portions of the system under test. In this paper we present the design of a flexible hardware interface to perform PHIL testing: some experimental results are also presented

   Grid Impcat of Fast Charging of Electric Vehicles
By Hector ZELAYA-DE LA PARRA, Kalid YUNUS, Muhamad REZA, Kailash SRIVASTAVA [View]
[Download]

Abstract: Charging PEVs (Plug-In Electric Vehicles) at public fast charging station can improve the publicacceptance and increase their penetration level by solving problems related to vehicles’ battery.However, the price for the impact of fast charging stations on the distribution grid has to be dealt with.The main purpose of this paper is to investigate the impacts of fast charging stations on a distributiongrid using a stochastic fast charging model and to present the charging model with some of its results.The model is used to investigate the impacts on distribution transformer loading and system busvoltage profiles of the test distribution grid. Stochastic and deterministic modelling approaches arealso compared. It is concluded that fast charging stations affect transformer loading and system busvoltage profiles. Hence, necessary measures such as using local energy storage and voltageconditioning devices, such as SVC (Static Var Compensator), have to be used at the charging stationto handle the problems. It is also illustrated that stochastic modelling approach can produce a moresound and realistic results than deterministic approach.

   Influence and benefits of stray magnetic couplings in EMC filtering
By Thomas DE OLIVEIRA, Jean-luc SCHANEN, Jean-Michel GUICHON [View]
[Download]

Abstract: The transfer function of an EMC (Electo-Magnetic Compatibility) filter can be strongly disturbed in high frequency (HF) due to all the magnetic and electrostatic imperfections. Some of them are specific to the discrete component geometry, and the others comes from stray couplings between every element of the system (as tracks well as components themselves). Theirs influences on an EMC filter response will be pointed out at first. Given that these phenomena have been commonly neglected so that to be able to easily describe the behaviour of a system, it was essential to have them as low as possible in order to have the real filter response the closest to the theoretical one. It is however possible to use them in order to improve the behaviour of the system instead of deteriorate it in high frequency. But this necessitates defining a complete analytical model where all the components appear, no one neglected. With this new modelling, other building guidelines could be given so that to have the best filter response that it is possible to have. This paper will then propose this analytical model.

   Minimizing temporal simulation time to estimate common mode disturbances
By Denis LABROUSSE, Bertrand REVOL, François COSTA, Cyrille GAUTIER [View]
[Download]

Abstract: This paper highlights the fact that the minimal time interval to compute the spectrum of a commonmode current is not more than a switching duration. From the acquisition of the common mode currentgenerated by a buck converter, two relevant pulses are extracted as well as the switching instants. Theconvolution of both allows to compute a estimated common mode current that has a spectralrepresentation very close to the real one. This technique can be easily applied from data extracted froma time domain simulation and seems to be very interesting in the perspective of reducing computationdurations.

   Motor Drive Common-Mode EMI Reduction by Passive Noise Cancellation
By Jian SUN [View]
[Download]

Abstract: A new method to reduce common-mode (CM) EMI emission at the dc input of variable-speed motor drives is presented. Unlike conventional passive or active filtering techniques that rely on impedance mismatch or active noise cancellation, the proposed method uses a passive circuit to cancel the CM current produced by the motor drive. In the proposed approach, a start-connected three-phase RC circuit is placed at the output of the inverter to extract the CM voltage. An inductor is connected between the star point of the RC circuit and the middle of the dc bus capacitor to inject a CM current into the dc input that cancels with the CM current produced by the inverter. Furthermore, a Wheatstone impedance bridge is identified in the CM equivalent circuit of the system after these passive components are added. By properly selecting the added passive components, the Wheatstone bridge can be balanced, resulting in near-ideal cancellation of the input CM current. The development of this impedance balancing method is presented in this paper and an experimental setup is used to demonstrate the effects of the proposed method. A comparison with conventional EMI filtering methods in terms of overall filter volume and effectiveness is also presented.

   Optimum Input-Filter-Capacitor Sizing for Fuel-Cell Based Single-Phase Inverter for Current-Ripple Mitigation
By Sudip MAZUMDER [View]
[Download]

Abstract: Most single-phase inverters, being sourced by fuel-cell stacks (FCSs), subject the stacks to reflected low-frequency (120 Hz) current ripples that ride on average dc currents. The ripple current impacts the sizing and efficiency of the FCS. As such and typically, a passive or active filter is required at the input of the inverter (or output of the FCS) to mitigate the ripple current. Towards that end, this paper outlines a guideline to choose the optimum size of a passive input-filter capacitor for a fuel-cell-based power system from the standpoints of the overall system energy density and cost. Detailed case-specific simulation results, based on an analytical approach, are provided to illustrate key issues for both unity-power-factor as well as harmonic loads.

   Reliability Models Applied to a System of Power Converters in Particle Accelerators
By Daniel SIEMASZKO, Michel SPEISER, Serge PITTET [View]
[Download]

Abstract: Several reliability models are studied when applied to a power system containing a large number ofpower converters. A methodology is proposed and illustrated in the case study of a novel linear particleaccelerator designed for reaching high energies. The proposed methods result in the prediction of bothreliability and availability of the considered system for optimisation purposes.

   System Integration Of A Variable Speed Generator Set: Challenges And System Design
By Juan Marcelo GUTIERREZ ALCARAZ, S.W.H. DE HAAN, J.A. FERREIRA [View]
[Download]

Abstract: Complex systems where multiple physical phenomena occur in the transformation of energy from one source to another are hard to design and model, such as in the generation of electrical energy from combustible fuel. Even when the principles of the system are clear several questions arise at the time to integrate such system; the designer has multiple design choices and most usually the performance of a newly integrated system will vary greatly from the performance of its individual components. This paper deals with the system integration challenges in the design of a Variable Speed Generator Set. In particular it shows how a novel formal methodology of system integration can help the designer to analyze the integration of such complex system from all different perspectives. We call these perspectives design domains, which are pertinent to the system, namely the thermal, electrical, volumetric and mechanical design domains.

   Three-dimensional Parasitics Cancellation in EMI Filters with Power Sandwich Construction
By Xun GONG, J.A FERREIRA [View]
[Download]

Abstract: This paper exploits the three-dimensional (3D) parasitics cancellation techniques for EMI filters in Power Sandwich integrated construction. A Power Sandwich filter employs surface mount technology (SMT) compatible x-dimensional (x-dim) components which have the same height and double sided SMT electrical terminations. Thereby a 3D spatial components placement platform is provided. The 3D techniques which aim to canceling/reducing both mutual and self parasitics of the filter are proposed and followed by the experimental verifications. A cancellation turn is designed to reduce the self ESL of the x-dim SMT capacitors. The proposed techniques are applied to a LC CM filter for a motor drive. The filter equivalent circuit model that only includes the extracted components self parasitics is built, where the parasitics and mutual couplings effects are analyzed, the crucial couplings are identified. The techniques are verified through a variety of performed measurements which include both the insertion loss experiments from a network analyzer and spectrum measurements from a LISN in the operating motor drive system. The experimental results show that the proposed techniques significantly improve the filter performance in the high conducted frequency range.

   Transient Stability Analysis of Inverter-Interfaced Distributed Generators in a Microgrid System
By Fabio ANDRADE, Luis ROMERAL, Jordi CUSIDÓ [View]
[Download]

Abstract: In this paper works with no-lineal tool and computer simulations, phase-plane trajectory analysis and method of Lyapunov for evaluate the limits of the small signal models and suggest to utilize models that can permit the analysis of the system when subjected to a severe transient disturbance.

   Voltage sag ridethrough of PMSG wind turbines using droop control stabilization
By Adria JUNYENT-FERRE, Oriol GOMIS-BELLMUNT, Eduardo PRIETO-ARAUJO, Fernando BIANCHI [View]
[Download]

Abstract: This paper presents a voltage sag ride-through strategy based on droop control for permanent-magnet synchronous machine (PMSM) wind turbines which allows independent control of the machine rectifier and the grid side inverter without communication. The formulation of the control algorithm is presented along with the analysis of the behavior of the system. The strategy is tested by means of simulation and real implementation on a scale platform.

EPE 2011 - DS3b: Topic 03: Power System Integration
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 03: Power System Integration > EPE 2011 - DS3b: Topic 03: Power System Integration
	[return to parent folder]

	A Review of Parallel Operation of Active Power Filters in the Distributed Generation System By MD Shafiuzzaman Khan KHADEM, Malabika BASU, Michael CONLON	[View] [Download]
Abstract: In this paper a technical review of parallel operation of Active Power Filter (APF) for harmonic powercompensation in distributed generation (DG) network has been presented. Controlling methods andconnection topologies with their pros and cons are described. Recent improvements in controlling andfuture trends for the application of APFs in distributed mode are also identified.

	Control Scheme of Three-level H-bridge Converter for Interfacing Between Renewable Energy Resources and AC Grid By Edris POURESMAEIL, Daniel MONTESINOS-MIRACLE, Oriol GOMIS-BELLMUNT	[View] [Download]
Abstract: This paper presents a control strategy of multilevel converters for integration of renewable energy resources into power grid. The proposed technique provides compensation for active, reactive, and harmonic current components of grid-connected loads. A three-level H-bridge converter is proposed as the interfacing system between renewable energy resources and utility grid. High performance of the proposed technique is indicated with injection of maximum available power from renewable energy resources to the power grid, increases power factor of the utility grid, and reduces the total harmonic distortion (THD) of grid current through Matlab/Simulink under proposed operating conditions.

	Electro-thermal modelling of three phase inverter By Hui HUANG, Philip MAWBY, Angus BRYANT	[View] [Download]
Abstract: This paper introduces an electro-thermal model of an inverter implemented in PLECS. This model is ableto calculate IGBT junction temperature with a mission profile. Look up tables (LUT) of switching powerloss are generated by running physics-based IGBT and diode models under different operating conditions. The inverter model interpolates power dissipation from the LUTs to speed up the simulation rather than running the physics-based device model, which is relatively slow. The thermal network is extracted from the heating curves of IGBT junction and case temperature which are measured on a power cycling rig. Junction temperature under operating condition is obtained with the power dissipation and thermal network. Although the work presented here is general applicable to any converter applications, our particular emphasis in this paper is on renewable energy system such as wind power applications. This model extends the current available inverter model[1] which is fixed frequency and voltage to various frequency and voltage which is more closely aligned with the operation of wind turbine.

	FlePs: a power interface for Power Hardware In the Loop By Andrea BENIGNI, Alexander HELMEDAG, Adil ABDALRAHMAN, Grzegorz PILATOWICZ, Antonello MONTI	[View] [Download]
Abstract: Power Hardware In the Loop (PHIL) is a recognized technique to extend Hardware In the Loop tests to power level by enforcing conservation of energy at the connection between real and virtual portions of the system under test. In this paper we present the design of a flexible hardware interface to perform PHIL testing: some experimental results are also presented

	Grid Impcat of Fast Charging of Electric Vehicles By Hector ZELAYA-DE LA PARRA, Kalid YUNUS, Muhamad REZA, Kailash SRIVASTAVA	[View] [Download]
Abstract: Charging PEVs (Plug-In Electric Vehicles) at public fast charging station can improve the publicacceptance and increase their penetration level by solving problems related to vehicles’ battery.However, the price for the impact of fast charging stations on the distribution grid has to be dealt with.The main purpose of this paper is to investigate the impacts of fast charging stations on a distributiongrid using a stochastic fast charging model and to present the charging model with some of its results.The model is used to investigate the impacts on distribution transformer loading and system busvoltage profiles of the test distribution grid. Stochastic and deterministic modelling approaches arealso compared. It is concluded that fast charging stations affect transformer loading and system busvoltage profiles. Hence, necessary measures such as using local energy storage and voltageconditioning devices, such as SVC (Static Var Compensator), have to be used at the charging stationto handle the problems. It is also illustrated that stochastic modelling approach can produce a moresound and realistic results than deterministic approach.

	Influence and benefits of stray magnetic couplings in EMC filtering By Thomas DE OLIVEIRA, Jean-luc SCHANEN, Jean-Michel GUICHON	[View] [Download]
Abstract: The transfer function of an EMC (Electo-Magnetic Compatibility) filter can be strongly disturbed in high frequency (HF) due to all the magnetic and electrostatic imperfections. Some of them are specific to the discrete component geometry, and the others comes from stray couplings between every element of the system (as tracks well as components themselves). Theirs influences on an EMC filter response will be pointed out at first. Given that these phenomena have been commonly neglected so that to be able to easily describe the behaviour of a system, it was essential to have them as low as possible in order to have the real filter response the closest to the theoretical one. It is however possible to use them in order to improve the behaviour of the system instead of deteriorate it in high frequency. But this necessitates defining a complete analytical model where all the components appear, no one neglected. With this new modelling, other building guidelines could be given so that to have the best filter response that it is possible to have. This paper will then propose this analytical model.

	Minimizing temporal simulation time to estimate common mode disturbances By Denis LABROUSSE, Bertrand REVOL, François COSTA, Cyrille GAUTIER	[View] [Download]
Abstract: This paper highlights the fact that the minimal time interval to compute the spectrum of a commonmode current is not more than a switching duration. From the acquisition of the common mode currentgenerated by a buck converter, two relevant pulses are extracted as well as the switching instants. Theconvolution of both allows to compute a estimated common mode current that has a spectralrepresentation very close to the real one. This technique can be easily applied from data extracted froma time domain simulation and seems to be very interesting in the perspective of reducing computationdurations.

	Motor Drive Common-Mode EMI Reduction by Passive Noise Cancellation By Jian SUN	[View] [Download]
Abstract: A new method to reduce common-mode (CM) EMI emission at the dc input of variable-speed motor drives is presented. Unlike conventional passive or active filtering techniques that rely on impedance mismatch or active noise cancellation, the proposed method uses a passive circuit to cancel the CM current produced by the motor drive. In the proposed approach, a start-connected three-phase RC circuit is placed at the output of the inverter to extract the CM voltage. An inductor is connected between the star point of the RC circuit and the middle of the dc bus capacitor to inject a CM current into the dc input that cancels with the CM current produced by the inverter. Furthermore, a Wheatstone impedance bridge is identified in the CM equivalent circuit of the system after these passive components are added. By properly selecting the added passive components, the Wheatstone bridge can be balanced, resulting in near-ideal cancellation of the input CM current. The development of this impedance balancing method is presented in this paper and an experimental setup is used to demonstrate the effects of the proposed method. A comparison with conventional EMI filtering methods in terms of overall filter volume and effectiveness is also presented.

	Optimum Input-Filter-Capacitor Sizing for Fuel-Cell Based Single-Phase Inverter for Current-Ripple Mitigation By Sudip MAZUMDER	[View] [Download]
Abstract: Most single-phase inverters, being sourced by fuel-cell stacks (FCSs), subject the stacks to reflected low-frequency (120 Hz) current ripples that ride on average dc currents. The ripple current impacts the sizing and efficiency of the FCS. As such and typically, a passive or active filter is required at the input of the inverter (or output of the FCS) to mitigate the ripple current. Towards that end, this paper outlines a guideline to choose the optimum size of a passive input-filter capacitor for a fuel-cell-based power system from the standpoints of the overall system energy density and cost. Detailed case-specific simulation results, based on an analytical approach, are provided to illustrate key issues for both unity-power-factor as well as harmonic loads.

	Reliability Models Applied to a System of Power Converters in Particle Accelerators By Daniel SIEMASZKO, Michel SPEISER, Serge PITTET	[View] [Download]
Abstract: Several reliability models are studied when applied to a power system containing a large number ofpower converters. A methodology is proposed and illustrated in the case study of a novel linear particleaccelerator designed for reaching high energies. The proposed methods result in the prediction of bothreliability and availability of the considered system for optimisation purposes.

	System Integration Of A Variable Speed Generator Set: Challenges And System Design By Juan Marcelo GUTIERREZ ALCARAZ, S.W.H. DE HAAN, J.A. FERREIRA	[View] [Download]
Abstract: Complex systems where multiple physical phenomena occur in the transformation of energy from one source to another are hard to design and model, such as in the generation of electrical energy from combustible fuel. Even when the principles of the system are clear several questions arise at the time to integrate such system; the designer has multiple design choices and most usually the performance of a newly integrated system will vary greatly from the performance of its individual components. This paper deals with the system integration challenges in the design of a Variable Speed Generator Set. In particular it shows how a novel formal methodology of system integration can help the designer to analyze the integration of such complex system from all different perspectives. We call these perspectives design domains, which are pertinent to the system, namely the thermal, electrical, volumetric and mechanical design domains.

	Three-dimensional Parasitics Cancellation in EMI Filters with Power Sandwich Construction By Xun GONG, J.A FERREIRA	[View] [Download]
Abstract: This paper exploits the three-dimensional (3D) parasitics cancellation techniques for EMI filters in Power Sandwich integrated construction. A Power Sandwich filter employs surface mount technology (SMT) compatible x-dimensional (x-dim) components which have the same height and double sided SMT electrical terminations. Thereby a 3D spatial components placement platform is provided. The 3D techniques which aim to canceling/reducing both mutual and self parasitics of the filter are proposed and followed by the experimental verifications. A cancellation turn is designed to reduce the self ESL of the x-dim SMT capacitors. The proposed techniques are applied to a LC CM filter for a motor drive. The filter equivalent circuit model that only includes the extracted components self parasitics is built, where the parasitics and mutual couplings effects are analyzed, the crucial couplings are identified. The techniques are verified through a variety of performed measurements which include both the insertion loss experiments from a network analyzer and spectrum measurements from a LISN in the operating motor drive system. The experimental results show that the proposed techniques significantly improve the filter performance in the high conducted frequency range.

	Transient Stability Analysis of Inverter-Interfaced Distributed Generators in a Microgrid System By Fabio ANDRADE, Luis ROMERAL, Jordi CUSIDÓ	[View] [Download]
Abstract: In this paper works with no-lineal tool and computer simulations, phase-plane trajectory analysis and method of Lyapunov for evaluate the limits of the small signal models and suggest to utilize models that can permit the analysis of the system when subjected to a severe transient disturbance.

	Voltage sag ridethrough of PMSG wind turbines using droop control stabilization By Adria JUNYENT-FERRE, Oriol GOMIS-BELLMUNT, Eduardo PRIETO-ARAUJO, Fernando BIANCHI	[View] [Download]
Abstract: This paper presents a voltage sag ride-through strategy based on droop control for permanent-magnet synchronous machine (PMSM) wind turbines which allows independent control of the machine rectifier and the grid side inverter without communication. The formulation of the control algorithm is presented along with the analysis of the behavior of the system. The strategy is tested by means of simulation and real implementation on a scale platform.