16 achievement(s) found
As part of the construction of the Severstal industrial site in Russia, Capsim carried out a study of the protection plan of all the HV and LV electrical grids. [...]
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.
ITER is a very large-scale international scientific experiment for demonstrating the scientific and technological feasibility of electricity production using energy from nuclear fusion and leading to its industrial and commercial production.
CAPSIM is undertaking a project to assist its customer, ITER ORGANIZATION, in the selection of architecture and in sizing the HVA and HVB electrical power grids.
The study includes performing the initial sizing of electrical equipment that will in future be used for the grid to auxiliary systems of the ITER facility.
This grid, known as the Steady State Electrical Power Network (SSEPN), is connected to a double circuit 400 kV line. It is able to supply the ITER auxiliary systems, i.e. cooling, cryogenics and pumping systems, etc.
The total power of the installed loads is 160 MW and 80% have medium voltage induction motors.
The network contains high/medium voltage transformers supplying the principal busbars. At each start up, the required electrical power is distributed to the various production and generation sectors via the circuit breakers, cables and step-down transformers. [...]
Because of changes in power consumption and the need for redundant power supply to FPSO (Floating Production Storage and Offloading Unit), it is strongly of interest to electrically interconnect units present in the same area using undersea cables. However, the impact on electrical plant in terms of dynamic stability, short circuit currents and harmonics must be analyzed in detail. [...]
The site studied was a very large facility undergoing reconversion that would result in it accommodating new consumption units and new generators (biomass plant) using the existing electrical grid. In this configuration, the operator, via a suitable structure, must ensure the supply of utilities (steam, electricity, etc.) for all of the industrial units present on the site. The realization of this service relies directly on the concepts of availability and reliability of the grids and the generators.
In this context, the project involved producing:
- An audit of the electrical grid consisting of identification of the strong and weak points of the HVA distribution network, in order to make the HVA grid reliable,
- A complete review of the protection plan in light of the results from the dynamic study and the replacement of analogue protection relays by a new generation digital relays.
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.
On an existing oil installation consisting of several platforms, the production of electricity and the power supply for water injection pumps on the platforms was being directly realized by ageing turbine generators. The obsolescence of this equipment led the operator to develop an electricity power grid using a shore-based electricity plant and an underwater connecting cable (between 20 and 30 km long at a depth of 30 m) linking the plant to the various platforms.
As part of this renovation project, it was necessary to evaluate the impact of normal transient events (load connection, load shedding, connection of the generator to the grid) and incidental events (short-circuit, loss of the generator, etc.) on the electrical power supply to the platforms. [...]
As part of the electrical connection of a wind farm, the future producer needed to comply with the latest regulations, in particular the French law of 23 April 2008. This law relates to the technical requirements of the design and operation of an electricity producing facility for connection to the public electricity distribution grid at low or medium voltage and imposes certain constraints in terms of the voltage plan to be observed at the common coupling point (point of delivery).
The producer must then study the adjustments and set points on the machines to satisfy the voltage plan at the common coupling point imposed by the distributor (contractual voltage and reactive production and absorption). [...]
The customer wished to understand the causes of a fault observed on the output of a 15 kV capacitor bank which had caused its removal from service. It also wanted CAPSIM to carry out a reactive compensation study to avoid additional invoicing from its energy supplier. [...]
The distribution grid of the Arsenal de Toulon is one of the largest private grids in France with more than 150 transformer stations.
Because of the obsolescence of certain protection devices and the limitations of the current protection plan, the management sought assistance to successfully complete the work with a view to updating the protection plan for the 10 kV - 50 Hz high voltage grid supplying its site. Moreover, it wished to improve the reactive energy compensation of the network in order to reduce its energy bill. [...]
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. [...]
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 (RÚseau de Transport dĺElectricitÚ) defined the specifications regarding the constructive capacities to be respected. These specifications are adapted to this case in terms of the power stationĺs ôsizeö, 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. [...]
For the construction project of the first ever wind farm in West Africa, Capsim was chosen to perform a study regarding the impact and the compatibility of a 25MW wind farm on the national power grid of Togo.
The main aim was to check whether the integration of the wind farm on the electrical grid was possible or not and also to define the necessary conditions for stability when the farm is connected. The substation to which the installation will be connected is managed by the national electrical grid company. This substation is also connected to the public electrical transmission grid managed by a neighbouring country operator. [...]
For the case of energetic development in sub-Saharan Africa, the construction of a 33MWp photovoltaic power station is planned. This future power station will be connected to the national electricity transmission grid of the country. This electrical grid can be interconnected with those of 2 neighbouring countries. This grid possesses several electrical thermal and hydraulic generation power units across the country.
In this context, Capsim was sought by investors and the network operator for the following:
- Analysis of the grid stability during power injection by the future power station on the interconnected national grid. In this particular case, the intermittence of the photovoltaic power station and the weaknesses already present in the current network (low production capacity, regular power cuts and black outs) are to be considered,
- Assistance in technical specification precisions to include in the tender files of the key-in-hand construction contract,
- Analysis of issues regarding the extension of the power station or the integration of additional power stations into the grid.
The customer wished to be able to create and exploit an ETAP model of his LV (28V) DC network so as to study the electrical behavior in steady network conditions as well as during short-circuits.
CAPSIM was therefore requested for this mission for its expertise and knowledge of networks under strong technical and regulatory constraints (civilian and military nuclear, offshore rigs, complex scientific equipment, etc...) and its knowledge regarding electrical calculation tools. [...]
For the extension of the EDF Saint Raphael source substation, EDF wished to validate the sizing of the earthing system of the substation. [...]