Variable-Speed Hydro Generation: Operational Aspects and Control

Fraile-Ardanuy, Jesús; Wilhelmi, J.R.; Fraile-Mora, J.; Pérez, Juan Ignacio Asensio

doi:10.1109/tec.2005.858084

Cited by 89 publications

(27 citation statements)

References 6 publications

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“…Wind Turbine Rotor mechanical converters such as Francis or Kaplan turbines [12], and they are not within the scope of the present work. The aim of the variable area controller is to regulate to flow emanating from the nozzle, in conventional hydroelectric power plants, this depends on the power demand from the turbine.…”

Section: Pelton Turbine Controlmentioning

confidence: 99%

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Buhagiar

Sant

Bugeja

2015

Volume 9: Ocean Renewable Energy

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The viability of offshore wind turbines is presently affected by a number of technical issues pertaining to the gearbox and power electronic components. Current work is considering the possibility of replacing the generator, gearbox and electrical transmission with a hydraulic system. Efficiency of the hydraulic transmission is around 90% for the selected geometries, which is comparable to the 94% expected for conventional wind turbines. A rotor-driven pump pressurises seawater that is transmitted across a large pipeline to a centralised generator platform. Hydroelectric energy conversion takes place in Pelton turbine. However, unlike conventional hydro-energy plants, the head available at the nozzle entry is highly unsteady. Adequate active control at the nozzle is therefore crucial in maintaining a fixed line pressure and an optimum Pelton turbine operation at synchronous speed. This paper presents a novel control scheme that is based on the combination of proportional feedback control and feed forward compensation on a variable area nozzle. Transient domain simulation results are presented for a Pelton wheel supplied by sea water from an offshore wind turbine-driven pump across a 10 km pipeline. NOMENCLATURE

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Section: Pelton Turbine Controlmentioning

confidence: 99%

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Buhagiar

Sant

Bugeja

2015

Volume 9: Ocean Renewable Energy

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“…3 are the basic schemes that are currently used for variable speed pumped storage systems, and such systems can of course also be www.intechopen.com considered for normal hydropower plants at sights were variable speed operation is considered to be beneficial (Ansel 2006;Arrilaga et al, 1992;Gjengedal 2001, Naidu & Mathur 1989Sporild et al, 2000). The alternative solution of using a full scale voltage source converter to drive the machine has not yet been used for commercial applications although it has been suggested as relevant for small scale hydropower stations (Abbey & Joos 2005;European Commission 2000;Fraile-Ardanuy et al, 2006). This topology can be applied both for cage induction machine and for synchronous machined, but except for the lowest power ratings, the synchronous machine might be the most relevant.…”

Section: Power Electronic Solutions To Obtain Variable Speed Operationmentioning

confidence: 99%

Variable Speed Pumped Storage Hydropower Plants for Integration of Wind Power in Isolated Power Systems

Suul¹

2009

Renewable Energy

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“…However, their efficiency depends considerably on the hydrological conditions (water head H and flow Q) during the constant speed operation. The effective range of the energy conversion system under the hydrological fluctuations can be widen by implementing the variable speed operation of the turbine [3]. This technique may be obtained by using the power electronic converter (PEC) that match the electrical energy taken from the generator to the power system requirements [4].…”

Section: Introductionmentioning

confidence: 99%

Efficiency analysis of an energy conversion system for a variable speed small hydropower plant

Węgiel

Borkowski

Liszka³

2016

E3S Web Conf.

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Abstract. Present-day Small Hydropower Plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation. However, the variable hydrological conditions that are found in the run-of-the-river projects require operations over a wide range of water flow and head variations. Special control methods and system topologies are needed to maintain the high efficiency of energy conversion systems. The synchronous generator excited by permanent magnets (PMSG) characterizes higher and more stable efficiency characteristic, in relation to the generated power, then mostly used in SHPs asynchronous machine. This paper investigates the efficiency of an example SHP solution. The researched system is based on an innovative generation unit (hydro-set) containing a propeller turbine integrated with the PMSG. In order to obtain the high efficiency in a wide range of water flow the variable speed operation method has been used. This solution requires a Power Electronic Unit in the energy conversion system to match the load and control the power flow from the generator to the grid. Efficiency analysis concerns all elements of the energy conversion system. Presented results comes from the real SHP of 150kW nominal power.

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Variable-Speed Hydro Generation: Operational Aspects and Control

Cited by 89 publications

References 6 publications

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice

Variable Speed Pumped Storage Hydropower Plants for Integration of Wind Power in Isolated Power Systems

Efficiency analysis of an energy conversion system for a variable speed small hydropower plant

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