Microgrids and the grid interaction. Microgrids could have a grid interconnection to Improve system economics Improve operation Improve availability With a suitable planning, grid planning can benefit from having microgrids by Reducing conductor’s size Improving availability
Transformers and conductors can now be oversized
(remember this aspect for PEV and PHEV integration)
CERTS microgrid (ac)
NTT Facilities Sendai project (ac and dc)
- “An electrical grid is a network of technologies that delivers electricity from power plants to consumers in their homes and offices.”
Maximum (delay) time
Predicted solar radiation on PV module
Ultracapacitors or flywheels (power buffer)
a grid’s problem transferred to the
Traditional Electricity Delivery Methods:Reliability
consumption is below 5 kW. An electric
vehicle may require 1 kW to be charged in 8
hrs. or up to 8 kW for shorter charging profiles.
Also, PEV and PHEV penetration is not uniform (higher for
neighborhoods with higher economical household income).
Hence, grid’s distribution transformers can be easily overloaded
PEV and PHEV even if charging is done during nighttime.