Pilot Microgrids
F3. EDP's Microgeneration facility
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EDP will make available for field trials a LV Microgrid that integrates a micro-cogeneration of a Natural Gas Station (NGS). The micro-cogeneration system is characterized by a complete cogeneration module, supported by a MicroTurbine with an electric power of 80kW. The electric power is generated in LV (400V) and supplies the NGS and it is exported to the MV public grid. After some electrical reconfigurations it will be possible to supply a small LV rural public grid with this micro-source, in interconnected and islanded modes.
The NGS recovery the thermal power from the MicroTurbine and demands more or less 5kW (the contracted power is 20.7kVA), in normal operation. The remaining power is exported to the MV grid or possibly to the LV grid.
Figure 6.8 shows a simplified diagram of EDP's Microgrid.
Figure 6.8 - EDP's Microgrid
The Micro Turbine presents the following main characteristics:
- Micro-turbine BOWMAN with 80kWe;
- Fuel: Natural gas;
- Operating information (from 17/Dez/2003 until 28/May/2004)
- Time of operation: 2.184h
- Energy produced: Electric = 170.168kWh; Heat = 379.580kWh
- Average power: Electric = 77,9kW; Heat = 173,8kW
- Average gas demand: 297,3kW
- Electrical efficiency: 26,2%
- Thermal efficiency: 58,5%
- Global efficiency: 84,7%
- Water temperature: 40oC up to 60oC
The main characteristics of the MV/LV Power Station on the above figure are:
- Apparent power: 160kVA
- Minimum short-circuit power on LV busbar: 3120kVA
- Maximum interconnection power: 100kW
- Protection fuse: 125A
- N.o of LV circuits: 4
- Earthing system: Dyn
The LV grid, which can be connected to the MicroTurbine, supplies few residential, commercial and industrial customers with contracted powers from 3.45 up to 41.5kVA.
Figure 6.9 - Installation overview (MicroTurbine on NG station)
The main characteristics of the MicroTurbine presented in figure 6.10 are:
Figure 6.10 - MicroTurbine and container overview
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