Background
An electricity grid may sometimes be subject to abrupt changes in its operating conditions, either in normal operation or due to an incident :
- Coupling or loss of a generator
- Load variation on the grid
- Start-up of a motor, reacceleration of a group of several motors
- Islanding operating mdoe of a power plant, load shedding
- Short-circuits, voltage dips, etc.
Requirement
The evolution from the initial conditions to the final conditions, called the transient phase, may involve disturbances on the grid or even degradation of its operation :
- Exceeding the limits defined by the grid standards (frequency and/or voltage range)
- Risk of dynamic and static instability (droop loss between the generators)
- Poorly damped oscillations of the regulation system, etc.
- Resonance and/or ferroresonance
For so many risks, this involves anticipation and control through the choice of equipment and suitable sizing, through optimum regulation of the regulating mechanisms and through instrumentation and control strategies, allowing the system to remain in a stable state (Power Management System).
Service principle
It is in this context that Capsim carries out dynamic studies and transient stability studies of the grid. These studies begin by considering the transient behaviour characteristics of the equipment (machines, regulation systems, etc.) and then modelling the grid using dynamic simulation software.
CAPSIM performs dynamic stability studies of electrical grids via tools such as ETAP, Eurostag, PowerFactory, Cyme, PSS-E, EDSA, PSIM, EMTP, PSCAD, Matlab-Simulink, etc... spending on the context and client requirements.
Results
These studies enable the analysis of various identified transient phases, the qualification and quantification of the disturbances which may appear, evaluation of the stability margins and proposal of remedial solutions in the event of a problem. They can also be used to evaluate instrumentation and control strategies (load shedding, power balance between generators, reconfiguration, etc.).
Our associated achievements
Changes in the value of the electrical parameters of two generators following the appearance of a fault
