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Simulations modeling a five-terminal meshed DC grid and a fast DC breaker were carried out with PSCAD/EMTDC using this design method.The results from the simulations confirmed the validity of the design method.], the flexible HVDC technology (VSC-HVDC), based on voltage source converters (VSC) has many advantages.
One advantage is that it highlights the independent control of the active and reactive power and has little demand for filtering and reactive power compensation devices, and the unchangeable voltage polarity when the power flow is reversed .
However, this situation is more difficult to handle for VSC-HVDCs.
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MT - Din it-traduzzjoni ġiet ipprovduta miċ-Ċentru tat-Traduzzjoni għall-Korpi tal-Unjoni Ewropea.
At this point, by coordinating the AC breakers near the rectifier, the DC breaker could reliably cut off the DC fault current and protect the system.
A detailed model for this fast solid state DC breaker and its operation sequence are studied, based on this design method.
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However, there is more than one transmission line between the converters in the multi-terminal HVDC systems and the DC grids.
This may cause a large power loss and a disturbance to the power system by shutting off the entire MTDC system.