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CFD Investigation of Complex Phenomena in S-Shape Region of Reversible Pump-Turbine

Communications2018-08-09T17:46:33+02:00October 19th, 2016|Publications, Stabilisation & stockage|

Pumped Storage Plants (PSP) using reversible pump-turbines offer the possibility to store large amounts of energy with high efficiency and at reasonable cost. For reversible high head pump-turbines, the characteristic curves exhibit an S-shape in the turbine, turbine break and reverse pump quadrants. This S-shape leads to unstable behavior of the turbine when coupling to the grid (for small guide vane opening) or to surge transient phenomena in case of emergency shutdown (for large guide vane opening).

CFD Investigation of Complex Phenomena in S-Shape Region of Reversible Pump-Turbine

Communications2021-08-11T17:17:17+02:00October 19th, 2016|Publications, Stabilisation & stockage|

Pumped Storage Plants (PSP) using reversible pump-turbines offer the possibility to store large amounts of energy with high efficiency and at reasonable cost. For reversible high head pump-turbines, the characteristic curves exhibit an S-shape in the turbine, turbine break and reverse pump quadrants. This S-shape leads to unstable behavior of the turbine when coupling to the grid (for small guide vane opening) or to surge transient phenomena in case of emergency shutdown (for large guide vane opening).

The rise of variable speed Pump Storage Plant (PSP)
Gallery
The rise of variable speed Pump Storage Plant (PSP)

Stabilisation & stockage

The rise of variable speed Pump Storage Plant (PSP)

Communications2023-01-31T13:11:18+01:00September 14th, 2016|Stabilisation & stockage|

Pumped Storage Plants (PSP) are the most reliable and well-known energy storage technology for high power applications. The needs of the future power network including DC transmission and intermittent power sources demand for fast responses from those storage plants. In order to face this new environment, the Variable Speed PSP (VarSpeed PSP) allows a faster response to the power grid.

The rise of variable speed Pump Storage Plant (PSP)
Gallery
The rise of variable speed Pump Storage Plant (PSP)

Stabilisation & stockage

The rise of variable speed Pump Storage Plant (PSP)

Communications2021-08-11T18:11:15+02:00September 14th, 2016|Stabilisation & stockage|

Pumped Storage Plants (PSP) are the most reliable and well-known energy storage technology for high power applications. The needs of the future power network including DC transmission and intermittent power sources demand for fast responses from those storage plants. In order to face this new environment, the Variable Speed PSP (VarSpeed PSP) allows a faster response to the power grid.

Leakage Current Measurements in Direct Current Gas Insulated Substations Equipment

Communications2021-08-11T17:17:21+02:00August 5th, 2016|Appareillage électrique haute tension, Publications|

Charge accumulation on solid insulator in Gas Insulated Substation (GIS) is one of the major issues under Direct Current (DC). A specific device has been developed in order to assess the origin of such charges within SF6, in a coaxial geometry.

DC-DC Converters for HVDC Grids: A Survey

Communications2021-08-11T17:17:26+02:00June 14th, 2016|Electronique de puissance & convertisseurs, Publications|

The recent interest in renewable energies has encouraged the research on a new concept of electrical grid - the Supergrid based on HVDC meshed grids. To be implemented, this new system requires the development of new technologies. One key-enabling technology is the high power DC-DC converter, a topic that is increasingly gaining more attention from both academia and industry.

A Preliminary Loss Comparison of Solid-State Transformers in a Rail Application Employing Silicon Carbide (SiC) MOSFET Switches

Communications2021-08-11T17:17:31+02:00April 21st, 2016|Electronique de puissance & convertisseurs, Publications|

The silicon carbide (SiC) power semiconductor and the medium frequency transformer (MFT) are two enabling technologies that are allowing the efficiencies and power densities of power electronic converters to be pushed beyond the limits of those that have previously been possible...

Barrier effect on Surface Breakdown of Epoxy Solid Dielectric in SF6 with Various Pressures

Communications2021-08-11T17:17:37+02:00January 12th, 2016|Appareillage électrique haute tension, Publications|

This paper is aimed at the experimental study of creeping discharges and flashover of cylindrical epoxy solid insulators with and without barrier.

Time constant evaluation of transient AC – DC field distribution

Communications2021-08-11T17:17:42+02:00November 18th, 2015|Appareillage électrique haute tension, Publications|

HVDC (High Voltage Direct Current) technology is particularly suitable for the transmission of high-power energy over long distances. However, some technical/technological problems have to be addressed/managed when passing from HVAC to HVDC due among others to the fact that the electric field distribution in gas insulated systems (GIS) operating under DC stress is very different from AC conditions.

Surface Flashover of Solid Insulator in Air

Communications2021-08-11T17:17:46+02:00November 18th, 2015|Appareillage électrique haute tension, Publications|

This paper is aimed at the propagation of discharges over a surface of insulator and the development of an analytical flashover model in air at atmospheric pressure. The experimental results show that the critical conditions of flashover are over the half of creeping distance.