Medium voltage DC (MVDC) grids for an all-electric society

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The target voltage for future expansion ±10 higher. Pilot project black, target architecture for future expansion blue MVAC HVAC MVDC LVDC DCSST .4 Implementation The OPHELIA project demonstrator has been implemented with: § DC-AC converter station consisting a unidirectional multilevel 800 kVA converter. Future phases are planned to include plants some long with power outputs MW. estimated that the capacity for such linear deployments in France [51].1.1. The sections land question retain their original use while electricity production becomes complementary activity. Such plants may only a few meters wide but could reach length of many kilometres, and peak power over tens of megawatts (roughly MWp/km). The DC-AC converter station protected with circuit breaker; each MVDC feeder protected with a DC circuit breaker, and each DC-DC converter is protected with fuse. DC-DC converters ensure the maximum power point tracking strings, and they limit the active power requested the utility grid operator. The pilot project consists of three DC-DC converter stations, which are interconnected radial MVDC network operating DC.5% efficiency.1.3 Protection OPHELIA’S protection strategy multi-terminal radial MVDC electric network with bidirectional DC-AC converter must consider the high short- circuit current the entire MVDC network in case pole-to-pole faults [52].1.50 MVDC projects around the world roads, cycle paths, etc. The electrical architecture is based around one DC-AC converter station and several DC-DC converter stations, as shown Figure 6-1. The distance between the power plant and the available AC grid substation may tens kilometres.1.1.1. 6.1. The protection scheme consists and DC circuit breakers and fuses.2 Control OPHELIA’S MVDC network voltage controlled by the DC-AC converter. detect pole-to- ground faults the MVDC network which uses a high impedance earthing system the protection system also requires insulation monitoring device. This high short- circuit current due the converter and cable capacitive discharge and the grid short circuit contribution.1 OPHELIA architecture The pilot phase the OPHELIA project consists of 900-meter-long plant with capacity of approximately MWp. Network reconfiguration facilitated by disconnectors located all nodes. central controller implemented to manage start/stop sequencing and converter setpoints. § DC-DC converter stations with 2-stage 250 solid state transformers with 98.), leaving natural spaces as they are. The DC-AC converter also controls the reactive power the connection to the grid. Figure 6-1 Electrical architecture the OPHELIA project. 6. 6. 6