EPE Association: EPE-PEMC 2008 - Topic: Energy Management of Hybrid Power System : Design of the Control System

EPE-PEMC 2008 - Topic: Energy Management of Hybrid Power System : Design of the Control System
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Energy Management of Hybrid Power System : Design of the Control System

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   Design of a Power Management System for an Active PV Station Including Various Storage Technologies
By Di Lu [View]
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Abstract: A hybrid power system with a PV energy conversion system is proposed with lead-acid batteries based long-term storage units and ultracapacitors based fastdynamic storage units in a DC-coupled structure. It is necessary and important to manage the powers among those different power sources. A power management algorithm is proposed for this hybrid power system by taking into account the characteristics of each power source. It carries out the calculation and the power distribution of an adjustable power margin for the power sources. As results, the lead-acid batteries can smooth the generated fluctuating photovoltaic power in a long time range (from minutes to hours), and the ultracapacitors can smooth the photovoltaic power in a short time range (from seconds to minutes).

   Energy Management and Power Flow of Decoupled Generation System for Power Conditioning of Renewable Energy Sources
By Włodzimierz Koczara [View]
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Abstract: Paper presents decoupled variable (adjustable) speed generation system and its application in renewable energy generation. The decoupled generation system consists of internal combustion engine, permanent magnet generator and AC/AC converter. Performance of single decoupled generation set are discussed supported by results of laboratory tests. The variable speed system provides high quality voltage in wide speed range when the step of load is low. However, when the step load is significant the voltage drop is not acceptable. Therefore to provide high quality produced voltage an additional energy storage, made from supercapacitor and bidirectional DC/DC converter, is applied. Such system performs very stiff voltage in any load condition. Integration of renewable wind energy system is provided via DC link of the variable speed decoupled autonomous generation system. The priority of the power draw is from the wind source. This is assured by a method of three reference signals for the DC link voltage. Speed control of the driving engine in region of low specific fuel consumption results in high efficiency conditioning of the unstable (wild) variable renewable energy source.

   Inversion Based Control of a Diesel Fed Low Temperature Fuel Cell System
By Daniela Chrenko, Marie-Cécile Péra and Daniel Hissel [View]
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Abstract: This document introduces the control structure development for the fuel processing unit of a pressurized, low temperature fuel cell system fed by commercial diesel. The control structure is developed using an inversion based method derived from the causal, graphic modeling approach called Energetic Macroscopic Representation. Its inversion leads to the maximum control structure. It has been applied to the fuel processing unit which transforms diesel into hydrogen rich gas. The approach contains mass flow and temperature control.

   Modular Architecture for Decentralized Hybrid Power Systems
By E. Ortjohann [View]
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Abstract: Modularity offers large potentials to the rising demands of modern power supply systems. It ensures an advanced level of flexibility and adaptability required by expanding grids. In this paper an introduction to modular design strategies in combination with standardized interfaces is given. Differences in application of modular design strategies to Hybrid Power System (HPS) hardware and software are discussed. An intensified application of decentralized energy converters is expected in future. By modular design this leads to the availability of new production techniques. Wide product and various application ranges in combination with large production quantities require design strategies adjusted to this circumstances. The modular design approach support this by offering flexibility also during the entire product lifecycle. As further effect, the reliability of decentralized HPS can be improved significantly. The introduced modular design strategy was successfully applied to an exemplary PV-battery HPS. The implemented pilot system proved the practicability, efficiency and reliability of modular designed HPS for modern expanding power supply systems.

   Power Management in an Autonomous Adjustable Speed Large Power Diesel Gensets
By Grzegorz Iwanski [View]
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Abstract: The autonomous power generation system with DFIG dedicated for diesel driven gensets is presented. Characteristics of torque and power versus speed of internal combustion engine ICE are analyzed at an angle of application in electrical power generation. Features and advantages of variable speed operation versus fixed speed operation of internal combustion engine are described. The vector control method for generation of fixed amplitude and frequency output voltage is presented. The PLL vectorial synchronization of the actual stator voltage with the reference vector allow the rotor speed and position sensorless operation. Variable speed operation of the ICE engine reduces fuel consumption what is important in continuously operated diesel and hybrid systems with renewable sources. Results of standalone operation of 2.2 kW doubly fed induction generator supplying nonlinear load are presented.

EPE-PEMC 2008 - Topic: Energy Management of Hybrid Power System : Design of the Control System
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Energy Management of Hybrid Power System : Design of the Control System
	[return to parent folder]

	Design of a Power Management System for an Active PV Station Including Various Storage Technologies By Di Lu	[View] [Download]
Abstract: A hybrid power system with a PV energy conversion system is proposed with lead-acid batteries based long-term storage units and ultracapacitors based fastdynamic storage units in a DC-coupled structure. It is necessary and important to manage the powers among those different power sources. A power management algorithm is proposed for this hybrid power system by taking into account the characteristics of each power source. It carries out the calculation and the power distribution of an adjustable power margin for the power sources. As results, the lead-acid batteries can smooth the generated fluctuating photovoltaic power in a long time range (from minutes to hours), and the ultracapacitors can smooth the photovoltaic power in a short time range (from seconds to minutes).

	Energy Management and Power Flow of Decoupled Generation System for Power Conditioning of Renewable Energy Sources By Włodzimierz Koczara	[View] [Download]
Abstract: Paper presents decoupled variable (adjustable) speed generation system and its application in renewable energy generation. The decoupled generation system consists of internal combustion engine, permanent magnet generator and AC/AC converter. Performance of single decoupled generation set are discussed supported by results of laboratory tests. The variable speed system provides high quality voltage in wide speed range when the step of load is low. However, when the step load is significant the voltage drop is not acceptable. Therefore to provide high quality produced voltage an additional energy storage, made from supercapacitor and bidirectional DC/DC converter, is applied. Such system performs very stiff voltage in any load condition. Integration of renewable wind energy system is provided via DC link of the variable speed decoupled autonomous generation system. The priority of the power draw is from the wind source. This is assured by a method of three reference signals for the DC link voltage. Speed control of the driving engine in region of low specific fuel consumption results in high efficiency conditioning of the unstable (wild) variable renewable energy source.

	Inversion Based Control of a Diesel Fed Low Temperature Fuel Cell System By Daniela Chrenko, Marie-Cécile Péra and Daniel Hissel	[View] [Download]
Abstract: This document introduces the control structure development for the fuel processing unit of a pressurized, low temperature fuel cell system fed by commercial diesel. The control structure is developed using an inversion based method derived from the causal, graphic modeling approach called Energetic Macroscopic Representation. Its inversion leads to the maximum control structure. It has been applied to the fuel processing unit which transforms diesel into hydrogen rich gas. The approach contains mass flow and temperature control.

	Modular Architecture for Decentralized Hybrid Power Systems By E. Ortjohann	[View] [Download]
Abstract: Modularity offers large potentials to the rising demands of modern power supply systems. It ensures an advanced level of flexibility and adaptability required by expanding grids. In this paper an introduction to modular design strategies in combination with standardized interfaces is given. Differences in application of modular design strategies to Hybrid Power System (HPS) hardware and software are discussed. An intensified application of decentralized energy converters is expected in future. By modular design this leads to the availability of new production techniques. Wide product and various application ranges in combination with large production quantities require design strategies adjusted to this circumstances. The modular design approach support this by offering flexibility also during the entire product lifecycle. As further effect, the reliability of decentralized HPS can be improved significantly. The introduced modular design strategy was successfully applied to an exemplary PV-battery HPS. The implemented pilot system proved the practicability, efficiency and reliability of modular designed HPS for modern expanding power supply systems.

	Power Management in an Autonomous Adjustable Speed Large Power Diesel Gensets By Grzegorz Iwanski	[View] [Download]
Abstract: The autonomous power generation system with DFIG dedicated for diesel driven gensets is presented. Characteristics of torque and power versus speed of internal combustion engine ICE are analyzed at an angle of application in electrical power generation. Features and advantages of variable speed operation versus fixed speed operation of internal combustion engine are described. The vector control method for generation of fixed amplitude and frequency output voltage is presented. The PLL vectorial synchronization of the actual stator voltage with the reference vector allow the rotor speed and position sensorless operation. Variable speed operation of the ICE engine reduces fuel consumption what is important in continuously operated diesel and hybrid systems with renewable sources. Results of standalone operation of 2.2 kW doubly fed induction generator supplying nonlinear load are presented.