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4 achievement(s) found

Modelling an electromagnetic lifting system

The system studied is composed of vertical rods whose lower ends are immersed in a liquid under pressure. Vertical displacement of the rods is achieved using grippers activated by induction coils.
In order to identify the failure risks of the system as part of the modification of its control system, it was necessary to evaluate the influence of the various parameters on the displacement controls for these rods. To achieve this, a model was produced using PSIM software. [...]

Electrical specifications for constructive capacities for cogeneration power plants

In order to be able to connect a cogeneration power plant to the public HVB grid, our customer needed to be able to demonstrate to its energy supplier that its installation complied with their defined specifications. In particular, they needed to provide the following simulations:
  • Constructive reactance capacity
  • Dynamic behaviour of the voltage regulation and stability under small movements
  • Stability under load transfer
  • Stability under short-circuit
  • Behaviour of the facility following a dip in voltage
  • Behaviour of the voltage under variation in frequency

Stability study of turbine generators during a dip in voltage

The French law of 23 April 2008, which specifies the conditions for connecting generating units to the public distribution grid, changed the requirements relating to disrupted voltage regimes on public grids.

Under certain conditions, the electricity producer must now leave its generating unit connected during fluctuations in frequency and voltage on the grid, where as previously it had been requested to uncouple the generator in such situations.

This part of the law applies to all generating units greater than 5 MW and may also apply to new installations with a modified existing installation or with installations for which the energy repurchasing contract comes to an end.

Article 14 sets a voltage dip profile at the point of delivery which must be tolerated without decoupling by the generating unit (see figure below).

Our client wished to study the possible impact of this voltage dip on its equipment and, in particular, the risk of instability and loss of synchronization on the generator.

Modelling of an electricity supply grid for a nuclear power station

The operator of the nuclear power station wanted to be able to predict the impact, from an electrical point of view, of particular configurations of the grid, while avoiding the need to perform on-site tests which are costly and complex to set up. [...]

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