RADEN LONDON LTD
Co. n. 14887434
124 City Road, London, EC1V 2NX



Microgrids are local electrical grids with defined electrical boudaries acting as a single and controllable entity.
They are usually able to operate both in grid-connected and islanded mode but totally stand-alone microgrids exist and are used to feed loads in remote areas where connection to the national grid is not feasible.

Microgrids have their own Distributed Energy Resources (DER) and Energy Storage Systems (ESS).
Switching from grid-connected to islanded mode and vice versa is dictated by technical or economic conditions. In this way microgids improve the security of supply (energy security) within the microgrid cell and can supply emergency power. In the same way they can be beneficial to the distribution grid providing ancillary services.






Advantages of microgrids are:
  • Provision of ancillary services through trading activity between the microgrid and the main grid.
  • Participation in the energy market.
  • Combination of grid-connected operation and storage allows to reduce the volatility of renewable energy sources.
  • Reduction of carbon emissions.
  • Hardened from severe weather and natural disasters by not having large assets and miles of above-ground wires.
  • High efficiency and resiliency made by modern optimization methods.

Challenges of microgrids are:
  • Bidirectional power flows may lead to complications in protection coordination, power flow patterns, fault current distribution and voltage control.
  • Stability issues: interactions between control system of DER units may create local oscillations. Moreover, the transition from grid-connected to islanded mode can create transient instability.
  • Modeling: standard models used for traditional distribution grid may not be valid for microgrids.
  • Low inertia due to power electronics which can lede to severe frequency deviations.
  • Uncertainty due to load profile and weather.

These challenges make the design of microgrids a high precision work. In order to design a microgrid a deep knowledge of electrical engineering and system theory is a fundamental requirement.
We provide our customers with high quality designs to make their microgrids cost-effective and meet their requirements.

If microgrids are too much for your needs, maybe you are looking for hybrid power systems.