EPE Association: EPE 2017 - DS3j: Wind Energy Systems

EPE 2017 - DS3j: Wind Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - DS3j: Wind Energy Systems

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   Active Power Support of a Full-Scale Converter-based WECS Through Modular Flywheel Storage System with DC Bus Signaling
By SANTIAGO VERNE [View]
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Abstract: The following paper presents a modular system for active power support in wind generators. It works onthe base of a Flywheel Energy Storage System (FESS) coupled to the DC link of a medium voltage backto-back multilevel converter. Two ANPC-5L compose a full-scale converter interface and a thirdconverter tied to the DC link drives a flywheel through an induction machine. All converters havepredictive controllers (FCS-MPC) and the charge-discharge management is decoupled from the windconversion system. It is fully decentralized and does not need any communication with the rest of thesystem, which provides modular storage capability.

   Direct Voltage and Frequency Control of an Offshore Wind Farm connected through LCC-HVDC Link
By JOSE LUIS RODRIGUEZ-AMENEDO [View]
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Abstract: This paper addresses the proposal and simulation of a direct voltage and frequency control (DVFC) ofan offshore wind farm (OWF) with LCC-HVDC connection. The proposed control system allows theconnection of the OWF to the LCC rectifier by generating a controlled voltage and frequency in acapacitor bank. The decoupled control of the d-q component of the voltage at the capacitor bank,connected to the ac side of LCC rectifier, allows achieving the direct control of voltage and frequency.The DVFC is implemented by orienting the capacitor voltage toward a synchronous axis that isgenerated within the controller and therefore is not subjected to any grid disturbance. The validation ofthis approach is done by simulation and the results demonstrate that the proposed DVFC is able tomaintain voltage and frequency within the OWF even during transient disturbances.

   High Voltage Cascaded Step-Up DC-DC Marx Converter for Offshore Wind Energy Systems
By SAMIR ALAGAB [View]
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Abstract: This paper presents an improved cascaded DC-DC resonant converter for offshore windfarms. The improvements are reduced losses and the number of components. The topology is based on the Marx principle where charged capacitors are charged in parallel and discharged in series to achieve the voltagetransformation. The four inductors of the converter are designed to resonate with the capacitors to createresonance forcing current zeros to enable zero current switching thereby reducing switching losses. Theoperating principles and design considerations of the proposed converter are discussed and the designequations are presented. In order to evaluate the operation of 50 MW converter aimed at connecting a30 kV DC Busbar in a wind power collection system to a 360 kV high voltage DC bus for transmissionto the onshore grid was simulated and the results are presented.

   Real Time Simulation of a Wind Turbine Driven Doubly Fed Induction Generator
By MOHAMED M. ZAKARIA MOUSTAFA [View]
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Abstract: This paper presents the modeling and control of a doubly-fed induction generator (DFIG) driven by awind turbine on a real time digital simulator. Real time digital simulators are widely used in the electricpower industry by utilities, equipment manufacturers and research organizations. In this paper, twoscenarios are considered, the first with a detailed switching model of the back-to-back Voltage SourceConverter (VSC) controlling the DFIG and the second with a simplified model of the VSC based on theconcept of dynamic average-value modeling. The hardware and software tools used for the real timesimulation are developed by RTDS Technologies Inc.

   Selection of DC/DC converter for offshore wind farms with MVDC power collection
By Catalin DINCAN [View]
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Abstract: Four DC/DC converters are analyzed and compared with respects to availability, efficiency, ratings, repair costs and power density. Intended application is offshore wind farms with MVDC power collection. The selected topology is a new series resonant converter, which offers 99\% efficiency across the entire operational range, but needs components designed for high voltage stress.

EPE 2017 - DS3j: Wind Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - DS3j: Wind Energy Systems
	[return to parent folder]

	Active Power Support of a Full-Scale Converter-based WECS Through Modular Flywheel Storage System with DC Bus Signaling By SANTIAGO VERNE	[View] [Download]
Abstract: The following paper presents a modular system for active power support in wind generators. It works onthe base of a Flywheel Energy Storage System (FESS) coupled to the DC link of a medium voltage backto-back multilevel converter. Two ANPC-5L compose a full-scale converter interface and a thirdconverter tied to the DC link drives a flywheel through an induction machine. All converters havepredictive controllers (FCS-MPC) and the charge-discharge management is decoupled from the windconversion system. It is fully decentralized and does not need any communication with the rest of thesystem, which provides modular storage capability.

	Direct Voltage and Frequency Control of an Offshore Wind Farm connected through LCC-HVDC Link By JOSE LUIS RODRIGUEZ-AMENEDO	[View] [Download]
Abstract: This paper addresses the proposal and simulation of a direct voltage and frequency control (DVFC) ofan offshore wind farm (OWF) with LCC-HVDC connection. The proposed control system allows theconnection of the OWF to the LCC rectifier by generating a controlled voltage and frequency in acapacitor bank. The decoupled control of the d-q component of the voltage at the capacitor bank,connected to the ac side of LCC rectifier, allows achieving the direct control of voltage and frequency.The DVFC is implemented by orienting the capacitor voltage toward a synchronous axis that isgenerated within the controller and therefore is not subjected to any grid disturbance. The validation ofthis approach is done by simulation and the results demonstrate that the proposed DVFC is able tomaintain voltage and frequency within the OWF even during transient disturbances.

	High Voltage Cascaded Step-Up DC-DC Marx Converter for Offshore Wind Energy Systems By SAMIR ALAGAB	[View] [Download]
Abstract: This paper presents an improved cascaded DC-DC resonant converter for offshore windfarms. The improvements are reduced losses and the number of components. The topology is based on the Marx principle where charged capacitors are charged in parallel and discharged in series to achieve the voltagetransformation. The four inductors of the converter are designed to resonate with the capacitors to createresonance forcing current zeros to enable zero current switching thereby reducing switching losses. Theoperating principles and design considerations of the proposed converter are discussed and the designequations are presented. In order to evaluate the operation of 50 MW converter aimed at connecting a30 kV DC Busbar in a wind power collection system to a 360 kV high voltage DC bus for transmissionto the onshore grid was simulated and the results are presented.

	Real Time Simulation of a Wind Turbine Driven Doubly Fed Induction Generator By MOHAMED M. ZAKARIA MOUSTAFA	[View] [Download]
Abstract: This paper presents the modeling and control of a doubly-fed induction generator (DFIG) driven by awind turbine on a real time digital simulator. Real time digital simulators are widely used in the electricpower industry by utilities, equipment manufacturers and research organizations. In this paper, twoscenarios are considered, the first with a detailed switching model of the back-to-back Voltage SourceConverter (VSC) controlling the DFIG and the second with a simplified model of the VSC based on theconcept of dynamic average-value modeling. The hardware and software tools used for the real timesimulation are developed by RTDS Technologies Inc.

	Selection of DC/DC converter for offshore wind farms with MVDC power collection By Catalin DINCAN	[View] [Download]
Abstract: Four DC/DC converters are analyzed and compared with respects to availability, efficiency, ratings, repair costs and power density. Intended application is offshore wind farms with MVDC power collection. The selected topology is a new series resonant converter, which offers 99\% efficiency across the entire operational range, but needs components designed for high voltage stress.