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Task separation for real-time simulation of the CIGRE DC grid benchmark

Meshed HVDC grids have been gaining a strong interest for a few years now. As DC grids consist of multiple technologies from multiple vendors, the requirements for Factory Acceptance Tests will likely include real-time simulation with physical controls of each converters connected to the same grid. These tests will ensure that each facility's control, protection and communication do not degrade the performances of the existing DC and AC grids. But running DC grids models in real-time is a technical challenge due to the size of the system, number of signals to be exchanged with the physical controls and the relatively small time steps required by the VSC technology.
This paper illustrates this topic by using the DC grid test system proposed by CIGRE. The test system model is described with the optimizations required to meet the real-time constraints. Task separation to solve this complex system on multiple CPU is presented. It is usually quite complex to achieve an efficient task separation with a reasonable number of CPU. So that different task grouping algorithms are discussed. Automatic and manual tasks separation is applied to find the optimum solution. Finally real-time simulation results are validated against EMT offline simulation.

Author(s):

Sébastien Dennetière    
RTE
France

Boris Bruned    
RTE
France

Hani Saad    
RTE
France

Eric Lemieux    
Hydro-Québec
Canada

 

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