EPE Association: EPE 2014 - LS1d: Wind Energy Systems

EPE 2014 - LS1d: Wind Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 05: Renewable Energy Power Systems > EPE 2014 - LS1d: Wind Energy Systems

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   Analysis and Optimization of TEG-Heatsink Waste Energy Harvesting System for Low Temperature Gradients
By Simon LINEYKIN, Igor RUCHAEVSKI, Alon KUPERMAN [View]
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Abstract: Abstract: Both full and simplified analysis of the electrical generating system consisting of a TEG, a heat source and a heat sink is presented. For ease of use the system is represented as an active two-terminal, which includes a voltage source and a non-linear temperature dependent resistor. The key role of the heat removal in the system and its influence on the values of the output parameters is shown.

   Analysis of Wind Turbines Connected to Medium-Voltage DC Grids
By Marco STIENEKER, Nurhan Rizqy AVEROUS, Nils SOLTAU, Hanno STAGGE, Rik DE DONCKER [View]
[Download]

Abstract: The transmission and distribution of electrical energy with direct current (dc) is a promising alternativeto established alternating-current (ac) systems. Higher efficiencies, fewer lossy pulse-width modulatedconverters and smaller transformers reduce operation and investment costs. Moreover, dc collector gridswithin wind parks leads to benefits for harvesting electrical energy. In this paper, a modular dual-activebridge (DAB) dc-dc converter system for integrating renewable energy sources, especially wind turbines(WT), into medium-voltage dc (MVDC) grids is presented and analyzed. Also, the design and efficiencyof the machine-side power converter of the WT for dc grids are discussed.

   Comparison and Evaluation of different three-level inverter topologies for PV systems
By Christian SCHOENER, David DERIX, Andreas HENSEL [View]
[Download]

Abstract: In this work different three-level topologies suitable for PV systems are analyzed. First the basic operation principles of the Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Mixed Voltage Neutral Point Clamped (MNPC) topologies are explained and the used PWM strategies are presented. All three topologies are realized in hardware on a modular test setup, so that it is possible to operate them under the same conditions. Efficiency measurements under different conditions (switching frequency f\_PWM = {16; 48; 90} kHz, output power, silicon carbide (SiC) semiconductors, driving circuits) are shown. Exceptional efficiencies of eta\_16kHz = 99.1 \% and eta\_90kHz = 98.6 \% are obtained.

   Power hardware in-the-loop laboratory test environment for small scale wind turbine prototype
By Anssi MÄKINEN, Tuomas MESSO, Heikki TUUSA [View]
[Download]

Abstract: This paper presents power hardware-in-the-loop (PHIL) laboratory test environment for wind turbine(WT) prototype. The environment utilizes dSPACE and RTDS real time simulators, convertercontrolled grid emulator (GE) and the prototype. The analysis is carried out using frequency responsemeasurements. The main contribution is the detailed analysis of the grid emulator performance. Themain performance limitations are revealed and it is shown that the performance of the GE is dependenton the hardware of the WT prototype in addition to the design of the emulator itself. The comparisonof the operation of the GE with open loop and closed loop control modes is carried out. It is shownthat the accuracy of the environment is clearly sufficient for symmetrical voltage dips when closedloop control system is used. However, the open loop controlled GE cannot execute correct point ofcommon coupling voltages independent on the operation point of the WT which is relative to the windconditions. If the GE is controlled at open loop or at closed loop, the network asymmetrical voltagedips are not generated accurately. The reason is that the system bandwidth is not wide enough toexecute negative sequence 50Hz component without gain and phase error. However, the accuracy ofthe PHIL environment is clearly enough for testing the operation of WT control functionalities underasymmetrical network voltages. These functionalities may include PCC voltage balancing or positivesequence reactive power injection.

EPE 2014 - LS1d: Wind Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 05: Renewable Energy Power Systems > EPE 2014 - LS1d: Wind Energy Systems
	[return to parent folder]

	Analysis and Optimization of TEG-Heatsink Waste Energy Harvesting System for Low Temperature Gradients By Simon LINEYKIN, Igor RUCHAEVSKI, Alon KUPERMAN	[View] [Download]
Abstract: Abstract: Both full and simplified analysis of the electrical generating system consisting of a TEG, a heat source and a heat sink is presented. For ease of use the system is represented as an active two-terminal, which includes a voltage source and a non-linear temperature dependent resistor. The key role of the heat removal in the system and its influence on the values of the output parameters is shown.

	Analysis of Wind Turbines Connected to Medium-Voltage DC Grids By Marco STIENEKER, Nurhan Rizqy AVEROUS, Nils SOLTAU, Hanno STAGGE, Rik DE DONCKER	[View] [Download]
Abstract: The transmission and distribution of electrical energy with direct current (dc) is a promising alternativeto established alternating-current (ac) systems. Higher efficiencies, fewer lossy pulse-width modulatedconverters and smaller transformers reduce operation and investment costs. Moreover, dc collector gridswithin wind parks leads to benefits for harvesting electrical energy. In this paper, a modular dual-activebridge (DAB) dc-dc converter system for integrating renewable energy sources, especially wind turbines(WT), into medium-voltage dc (MVDC) grids is presented and analyzed. Also, the design and efficiencyof the machine-side power converter of the WT for dc grids are discussed.

	Comparison and Evaluation of different three-level inverter topologies for PV systems By Christian SCHOENER, David DERIX, Andreas HENSEL	[View] [Download]
Abstract: In this work different three-level topologies suitable for PV systems are analyzed. First the basic operation principles of the Neutral Point Clamped (NPC), Active Neutral Point Clamped (ANPC) and Mixed Voltage Neutral Point Clamped (MNPC) topologies are explained and the used PWM strategies are presented. All three topologies are realized in hardware on a modular test setup, so that it is possible to operate them under the same conditions. Efficiency measurements under different conditions (switching frequency f\_PWM = {16; 48; 90} kHz, output power, silicon carbide (SiC) semiconductors, driving circuits) are shown. Exceptional efficiencies of eta\_16kHz = 99.1 \% and eta\_90kHz = 98.6 \% are obtained.

	Power hardware in-the-loop laboratory test environment for small scale wind turbine prototype By Anssi MÄKINEN, Tuomas MESSO, Heikki TUUSA	[View] [Download]
Abstract: This paper presents power hardware-in-the-loop (PHIL) laboratory test environment for wind turbine(WT) prototype. The environment utilizes dSPACE and RTDS real time simulators, convertercontrolled grid emulator (GE) and the prototype. The analysis is carried out using frequency responsemeasurements. The main contribution is the detailed analysis of the grid emulator performance. Themain performance limitations are revealed and it is shown that the performance of the GE is dependenton the hardware of the WT prototype in addition to the design of the emulator itself. The comparisonof the operation of the GE with open loop and closed loop control modes is carried out. It is shownthat the accuracy of the environment is clearly sufficient for symmetrical voltage dips when closedloop control system is used. However, the open loop controlled GE cannot execute correct point ofcommon coupling voltages independent on the operation point of the WT which is relative to the windconditions. If the GE is controlled at open loop or at closed loop, the network asymmetrical voltagedips are not generated accurately. The reason is that the system bandwidth is not wide enough toexecute negative sequence 50Hz component without gain and phase error. However, the accuracy ofthe PHIL environment is clearly enough for testing the operation of WT control functionalities underasymmetrical network voltages. These functionalities may include PCC voltage balancing or positivesequence reactive power injection.