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Recap of Week 1


Welcome back to Week 2! Before we talk about what we are going to learn this week, it is good to take a moment to look back and remember what we learned last week. Here are my summary notes from the first week of the course:

  • V2G must be considered within the context of the energy system, in which supply and demand must match, and lines and transformers cannot be overloaded.
  • Conventional EV charging can be either AC or DC and ranges from powers of 7kW up to 450kW.
  • V2G was conceptualised in the 1990s, with the first field test in 2007.
  • V2G is important because it can assist users of the technology with backup power, energy autonomy and battery health management.
  • To charge an EV, AC electricity from the grid must go through rectification to DC. When discharging an EV to the grid, DC electricity from the EV must go through inversion to AC.
  • V2G can be implemented in two ways, with the energy transfer between the EVSE and EV either in DC or AC.
  • The three key sub-systems within the V2G eco-system are the vehicle, the chargepoint and the chargepoint operator (CPO).
  • ISO15118-20 is the key standard that will facilitate V2G for CCS charging.
  • The Open Chargepoint Protocol (OCPP) is the key standard that facilitates communication between the EVSE and the CPO.
  • V2G can be used for a range of applications such as: energy arbitrage, grid services (such as frequency response), peak shaving, self-consumption of local renewables, managing electricity import constraints, backup power or powering equipment in off-grid situations.

What Do You Think?

What else do you remember from the last week? Is there anything else that you learnt in Week 1 that stood out for you? Why not contribute your thoughts in the discussion below?

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Vehicle-to-Grid Charging for Electric Cars

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