EPE Association: EPE 2007 - Subtopic 13-8 - DS: Power Factor Correctors (PFC); modelling, simulation and design methods

EPE 2007 - Subtopic 13-8 - DS: Power Factor Correctors (PFC); modelling, simulation and design methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 13: 'Electrical energy generating systems, renewable energy systems' > EPE 2007 - Subtopic 13-8 - DS: Power Factor Correctors (PFC); modelling, simulation and design methods

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   A new method to define power and energy share in a DC link Hybrid wind-diesel powered system by means of storage and dual time-frequency approach
By EL MOKADEM Mostafa; NICHITA Cristian; KOCZARA Wlodzimierz; DAKYO Brayima [View]
[Download]

Abstract: We show that frequency bands of interaction as well as dynamics of energy flow to the point of common coupling (PCC) lead to hybrid system design keys. Related to each power source and storage device, segmentation of frequency domain of the hybrid system is achieved by control strategy in time domain.

   A SIMPLE GENERIC WIND TURBINE MODEL FOR GRID STUDIES
By BECH John; ANDERSEN Gert K. ; SKAUG Kenneth; NIELSEN Peter; MADSEN Knud D. H. [View]
[Download]

Abstract: A generic model of a wind turbine with a double fed generator for grid stability studies is presented. The model takes-off in the required model performance rather than the physical structure and components of the wind turbine. Analysis shows that substantial reductions in model complexity can be achieved by extending some of the basic assumptions for a grid stability model into model simplifications. In spite of large variation in model complexity, a case study in PowerFactory reveals no significant performance variations when the performance oriented model is compared to a far more complex component-oriented model.

   A simple model of photovoltaic module electric characteristics
By BOEKE Ulrich [View]
[Download]

Abstract: Power electronics is used in an increasing number of applications as connecting element between photovoltaic modules and electric loads. The design of power converters for these applications needs to consider hereby the electrical characteristics of solar cells. To support this, a behavioural model has been developed to characterise current, voltage and power of photovoltaic modules as function of solar cell temperature and solar radiation. It has the advantage to use only parameters that are available from data sheets plus a single fit parameter. Calculated diagrams are compared with diagrams of two photovoltaic module data sheets.

   Modeling of Electrical Power Distribution Systems with a Dynamic-RMS Method
By MOHD Alaa; ORTJOHANN Egon; SCHMELTER Andreas; HAMSIC Nedzad ; SINSUKTHAVOR Worpong [View]
[Download]

Abstract: The abstract is not available.

   Novel 3-Phase Phase-Locked Loop Composed of Adaptive Linear Combiner
By HAN Byung [View]
[Download]

Abstract: This paper proposes a novel structure of 3-phase Phase-Locked Loop that is composed of Adaptive Linear Combiner and Proportional Integral control. The operational principle was investigated through theoretical approach. The performance was verified through computer simulations with MATLAB and experimental works with TMS320vc33 Digital Signal Processor board. The 3-phase Phase-Locked Loop shows accurate performance under the voltage disturbances such as sag, harmonics, and phase-angle jump.

   Optimal operation of a single phase converter by switching frequency changes
By GEORGAKAS Konstantinos; SAFACAS Athanasios [View]
[Download]

Abstract: The control of the power flow from an AC grid to a DC load leads to reactive power increase and affe-cts the efficiency. Especially when the converters operate by the power grid's frequency, the switching power losses of the semiconductor elements get minimal value but the power factor becomes poor. This happens because of the high order harmonics injection and the change of the phase angle between the first order harmonic of the grid current and the grid voltage when DC voltage control is necessary. The under consideration converter topology in this paper operates in such a way that the basic current harmonic is in phase with the grid sinusoidal voltage. So, for higher switching frequency values the power factor becomes higher while the power losses increase and consequently the efficiency becomes lower. In this case the power factor depends only on the grid current high order harmonics. These high order harmonics can be removed from the power grid by the use of a passive L - C filter, and so the power factor becomes high. It is obvious that the L-C filter value depends on the switching frequency. In the present work both the optimization of the power factor and efficiency by switching frequency changes is investigated, also an appropriate L-C filter is chosen.

   Optimization of a Linear Induction Oscillatory Machine in a Stirling Cogeneration system
By BEN AHMED Amid; MULTON Bernard; GARCIA BURREL Isabel; MONMASSON Eric; PREVOND Laurent; LE BALLOIS Sandrine [View]
[Download]

Abstract: The simultaneous production of heat and power at a small-scale is already a well known technique. Cogeneration is one of the main ways to bring about decentralized, embedded, localized and/or autonomous power production. However, it is still a challenge to design cogenerators to be below 10 kW as required for the smallest applications such as providing heat and power to a single house. This paper specifically presents an automated procedure to optimize the generator performances of a microcogenerator. The procedure uses a steady-state analytical model of the generator to determine the parameters of its dynamical model. Then, the micro-cogenerator dynamics are simulated to calculate two accurate objective functions that are minimized by a genetic algorithm.

   Wind generation stabilization using a hydrogen buffer
By SANCHEZ Carlos; SEGURA Isidoro; PAYA Jorge; PEREZ-NAVARRO Angel; IBANEZ Fernando; BERNAL Eva [View]
[Download]

Abstract: Wind generation is increasing substantially its share in the electricity generation portfolio in many countries. In the case of Spain, it can be more than double in the next four years, reaching a 20 GW level. To become competitive in a liberalized market, wind energy reliability requirements should be guaranteed. Storage systems are being considered to avoid the impact on the electricity generation process of the lack of adequate winds. In this paper, a solution to wind generated electrical power availability is proposed. It is based on the use of the electricity surplus, during low demand hours, for hydrogen generation and storage. This hydrogen could be used later to feed fuel cells and compensate wind generator output during peak demand hours. Assuming different scenarios for the electricity markets and the wind farm operation, the minimum requirements on energy efficiency of a storage system based on the use of hydrogen as energy vector to become economical competitive for each of those scenarios are deduced.

EPE 2007 - Subtopic 13-8 - DS: Power Factor Correctors (PFC); modelling, simulation and design methods
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 13: 'Electrical energy generating systems, renewable energy systems' > EPE 2007 - Subtopic 13-8 - DS: Power Factor Correctors (PFC); modelling, simulation and design methods
	[return to parent folder]

	A new method to define power and energy share in a DC link Hybrid wind-diesel powered system by means of storage and dual time-frequency approach By EL MOKADEM Mostafa; NICHITA Cristian; KOCZARA Wlodzimierz; DAKYO Brayima	[View] [Download]
Abstract: We show that frequency bands of interaction as well as dynamics of energy flow to the point of common coupling (PCC) lead to hybrid system design keys. Related to each power source and storage device, segmentation of frequency domain of the hybrid system is achieved by control strategy in time domain.

	A SIMPLE GENERIC WIND TURBINE MODEL FOR GRID STUDIES By BECH John; ANDERSEN Gert K. ; SKAUG Kenneth; NIELSEN Peter; MADSEN Knud D. H.	[View] [Download]
Abstract: A generic model of a wind turbine with a double fed generator for grid stability studies is presented. The model takes-off in the required model performance rather than the physical structure and components of the wind turbine. Analysis shows that substantial reductions in model complexity can be achieved by extending some of the basic assumptions for a grid stability model into model simplifications. In spite of large variation in model complexity, a case study in PowerFactory reveals no significant performance variations when the performance oriented model is compared to a far more complex component-oriented model.

	A simple model of photovoltaic module electric characteristics By BOEKE Ulrich	[View] [Download]
Abstract: Power electronics is used in an increasing number of applications as connecting element between photovoltaic modules and electric loads. The design of power converters for these applications needs to consider hereby the electrical characteristics of solar cells. To support this, a behavioural model has been developed to characterise current, voltage and power of photovoltaic modules as function of solar cell temperature and solar radiation. It has the advantage to use only parameters that are available from data sheets plus a single fit parameter. Calculated diagrams are compared with diagrams of two photovoltaic module data sheets.

	Modeling of Electrical Power Distribution Systems with a Dynamic-RMS Method By MOHD Alaa; ORTJOHANN Egon; SCHMELTER Andreas; HAMSIC Nedzad ; SINSUKTHAVOR Worpong	[View] [Download]
Abstract: The abstract is not available.

	Novel 3-Phase Phase-Locked Loop Composed of Adaptive Linear Combiner By HAN Byung	[View] [Download]
Abstract: This paper proposes a novel structure of 3-phase Phase-Locked Loop that is composed of Adaptive Linear Combiner and Proportional Integral control. The operational principle was investigated through theoretical approach. The performance was verified through computer simulations with MATLAB and experimental works with TMS320vc33 Digital Signal Processor board. The 3-phase Phase-Locked Loop shows accurate performance under the voltage disturbances such as sag, harmonics, and phase-angle jump.

	Optimal operation of a single phase converter by switching frequency changes By GEORGAKAS Konstantinos; SAFACAS Athanasios	[View] [Download]
Abstract: The control of the power flow from an AC grid to a DC load leads to reactive power increase and affe-cts the efficiency. Especially when the converters operate by the power grid's frequency, the switching power losses of the semiconductor elements get minimal value but the power factor becomes poor. This happens because of the high order harmonics injection and the change of the phase angle between the first order harmonic of the grid current and the grid voltage when DC voltage control is necessary. The under consideration converter topology in this paper operates in such a way that the basic current harmonic is in phase with the grid sinusoidal voltage. So, for higher switching frequency values the power factor becomes higher while the power losses increase and consequently the efficiency becomes lower. In this case the power factor depends only on the grid current high order harmonics. These high order harmonics can be removed from the power grid by the use of a passive L - C filter, and so the power factor becomes high. It is obvious that the L-C filter value depends on the switching frequency. In the present work both the optimization of the power factor and efficiency by switching frequency changes is investigated, also an appropriate L-C filter is chosen.

	Optimization of a Linear Induction Oscillatory Machine in a Stirling Cogeneration system By BEN AHMED Amid; MULTON Bernard; GARCIA BURREL Isabel; MONMASSON Eric; PREVOND Laurent; LE BALLOIS Sandrine	[View] [Download]
Abstract: The simultaneous production of heat and power at a small-scale is already a well known technique. Cogeneration is one of the main ways to bring about decentralized, embedded, localized and/or autonomous power production. However, it is still a challenge to design cogenerators to be below 10 kW as required for the smallest applications such as providing heat and power to a single house. This paper specifically presents an automated procedure to optimize the generator performances of a microcogenerator. The procedure uses a steady-state analytical model of the generator to determine the parameters of its dynamical model. Then, the micro-cogenerator dynamics are simulated to calculate two accurate objective functions that are minimized by a genetic algorithm.

	Wind generation stabilization using a hydrogen buffer By SANCHEZ Carlos; SEGURA Isidoro; PAYA Jorge; PEREZ-NAVARRO Angel; IBANEZ Fernando; BERNAL Eva	[View] [Download]
Abstract: Wind generation is increasing substantially its share in the electricity generation portfolio in many countries. In the case of Spain, it can be more than double in the next four years, reaching a 20 GW level. To become competitive in a liberalized market, wind energy reliability requirements should be guaranteed. Storage systems are being considered to avoid the impact on the electricity generation process of the lack of adequate winds. In this paper, a solution to wind generated electrical power availability is proposed. It is based on the use of the electricity surplus, during low demand hours, for hydrogen generation and storage. This hydrogen could be used later to feed fuel cells and compensate wind generator output during peak demand hours. Assuming different scenarios for the electricity markets and the wind farm operation, the minimum requirements on energy efficiency of a storage system based on the use of hydrogen as energy vector to become economical competitive for each of those scenarios are deduced.