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15 achievement(s) found As part of the connection of a 63/20 kV transformer station supplying a gas compression plant, CAPSIM investigated the risk of ferroresonance on the site. [...]This project involved designing an islanded system supplied by a collection of multiple renewable electrical energy sources . The inhomogeneous character of the sources (wind turbines, fuel cells, diesel generators, etc.) required a suitable control system to be defined. [...]As part of the project for the realization of a second French aircraft carrier, PA2, in the "All Electrical Ship" version, it was necessary to validate the design choices for the electrical power grid of the ship and to verify that all the standard constraints could be met, particularly from the point of view of the dynamic stability of the power grid. [...]In order to accompany the nuclear fusion research activities of the ITER project, it has proved necessary to improve the Japanese JT60 fusion reactor (tokamak). Capsim has participated in the design of the project by modelling all of the electrical supply infrastructure and by simulating the current draw necessary for a plasma shot.
The objective was to evaluate the impact in terms of the active power, reactive power, frequency and voltage of the network, and to verify the correct sizing of the equipment that makes up the 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. [...]The MOSARE project was developed by CAPSIM in response to the following needs: - To have a tool available which can increase the technical expertise on new programmes,
- To study the impact of new technologies proposed by industrial companies,
- To produce expert reports on the fleet already in service.
[...]This study involved determining the influence of the tolerances applied to the various parameters of a motor driven pump and its power supply system, on its capacity to change from a low speed regime to a high-speed regime. This equipment delivers a cooling function for a nuclear application. [...]The industrial site studied was constructed in the 1950s and has been subject to many changes. The electricity distribution grid on the site contains several autonomous sources (turbine generators), distributed at various points on the HVA and HVB grids. The function of these generators is to supply the priority units in the event of a power grid problem (internal or external to the site).
The site was recently subject to two major incidents in less than six months on the main HVA distribution grid, incidents which resulted in the loss of supply to the priority units and the start-up of the autonomous sources supplying power to these units. Following these incidents, the operator undertook a campaign to modernize the excitation regulation for the turbine generators.
This involved allowing the customer to understand the dynamic behaviour of its autonomous sources in the event of a transient event on the grid. The initial objective was to analyze and validate the causes of the incident. The second objective was to analyze the influence of modifications made to the excitation regulation and to detect the operating limits to impose on the autonomous sources after modification. [...]Prior to the stability study described here, CAPSIM had produced power flow calculations and calculations of the short-circuit currents for the operator of an industrial electrical power grid. These calculations had been used to validate the sizing of equipment and to put in place a protection plan for the grid.
The turbine generators for that network could operate either independently or coupled to the public distribution grid and simulations were carried out for the two operating configurations. Events acting on the islanded configuration could more easily result in a grid instability because the short-circuit power of the sources was lower.
The objective of the study was to validate the protection plan put in place by CAPSIM as well as to perform a study of the dynamic behaviour of the turbine generators when subject to disruption events. The outdated nature of the generators and their excitation raised questions regarding their robustness and their effectiveness when faced with such events.
[...]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
[...]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.
[...]For the case of the connection of a power station to the French HV network (HTA RTE), the PV power generation company must prove that its infrastructure will not cause instability on the grid. For this situation, RTE (Réseau de Transport d’Electricité) defined the specifications regarding the constructive capacities to be respected. These specifications are adapted to this case in terms of the power station’s “size”, its location on the power grid and the type of electricity generation (wind turbines, photovoltaic cells).
The PV power generation company must submit a technical document consisting of simulation analysis files and test files in order to check the respect of the connection specifications.
The aim of the study was to simulate the connection of a 33MW photovoltaic power station to the 63kV HV grid.
Moreover, during this study, CAPSIM was asked to analyse the primary voltage regulation system which controls the active power of the solar park by acting on the photovoltaic inverters set point. [...]The breakthroughs in the field of power electronics regarding on one hand photovoltaic panels and on the other hand enable to consider higher levels of DC distribution voltage within PV power stations. Indeed, for a given photovoltaic power, the increase in distribution voltage allows decreasing the current to be delivered to the network, and therefore to limit the cable distances required and distribution losses. These advantages must however be compared to technical-economic issues that an increase in distribution voltage may represent: availability of equipment from manufacturers, higher purchase costs, technical uncertainties…).
Our client requested us for quantifying the technical-economic impact of increasing the DC voltage to 1500V, and then to 3000V (initially planned to be at 1000V) of their several MWs PV power station. [...]Following the commissioning of the all electric ship’s power station, a phenomenon active power “pumping” (of several MW) between 2 diesel generators has been observed. This phenomenon is characterised by active power transfer in both ways from one diesel generator to another; and is likely to cause a malfunction of the control system as well as an accelerated deterioration of the diesel generators themselves. The network operator wishes to identify the causes of this issue and to solve this problem. [...]Soon after the commissioning of a 3MVA diesel generator on a site, degradations and tears were noticed in the mechanical coupling between the diesel engine and the alternator. The expert checking on the mechanical coupling did not show any fault on the deteriorations.
The network manager therefore requested CAPSIM to do a diagnostic based on numerical simulations. [...] | 
