A major player in the EVSE market has kindly consented to provide some technical training for the electrical installation tutors at a training centre where I often tutor part-time. I imagine it is not entirely motivated by altruistic considerations but at least it gives an opportunity for the tutors and myself to get some kind of grasp on the various products on offer and where this particular manufacturer sees the direction of travel for EVSE. I am already aware that the company is moving away from products that rely on the installation of earth electrodes in PME situations and are placing considerable focus on load management. Is there any particular question that you would ask them given the opportunity?
I think that neither of you has analysed the problem properly. I am not talking about that kind of management. I have a 1 MVA supply, Clearly, I would not add enough chargers to exceed my supply. The kind of demand management I am talking about is to match the car charging to the wind and solar supply limits of the entire grid. There is no point whatever in running an electric car unless it is solely charged from "renewables", because the car/charging system is less efficient than a fossil-fueled car by itself, and miles more expensive to make and provide infrastructure to run it.
There are many reasons why the supply frequency is controlled within fairly narrow limits, and it is important that doesn't change. Using frequency as a demand signalling device wouldn't work. It is already being made less stable because of reduced mechanical inertia, and there is no instant control mechanism available to stabilise it or control it anyway.
All of this assumes that EV drivers would be happy that they had no control of the charge in their car. Someone planning a long trip would be at the mercy of the wind or light as to the length of stops for charging. Imagine 5 days with no wind in winter. A car could take days to charge as almost no renewable power would be available, that really is rather a long stop at the Motorway services. The whole plan with electric vehicles assumes, in my view falsely, that they will be used for short trips locally, and that Holidays will be taken by bicycle (or very locally). It also assumes that vehicle charging will be provided by someone else at zero cost to the EV owner and that fossil fuel-derived electricity may be used to power the car most of the time. In fact, the whole renewables "free electricity" plan is so flawed that it must have been dreamed up by an Oxbridge graduate in medieval architecture. No Engineer of any ability would contemplate such a system if they had to be responsible for the result and cost. The whole lot seems to mimic Crossrail and HS2, astronomical cost overruns, extreme lateness, and probably non-functionality when completed because the capacity planned is no longer correct. It sounds awfully like the Electricity system at the moment.
I think that neither of you has analysed the problem properly. I am not talking about that kind of management. I have a 1 MVA supply, Clearly, I would not add enough chargers to exceed my supply. The kind of demand management I am talking about is to match the car charging to the wind and solar supply limits of the entire grid. There is no point whatever in running an electric car unless it is solely charged from "renewables", because the car/charging system is less efficient than a fossil-fueled car by itself, and miles more expensive to make and provide infrastructure to run it.
There are many reasons why the supply frequency is controlled within fairly narrow limits, and it is important that doesn't change. Using frequency as a demand signalling device wouldn't work. It is already being made less stable because of reduced mechanical inertia, and there is no instant control mechanism available to stabilise it or control it anyway.
All of this assumes that EV drivers would be happy that they had no control of the charge in their car. Someone planning a long trip would be at the mercy of the wind or light as to the length of stops for charging. Imagine 5 days with no wind in winter. A car could take days to charge as almost no renewable power would be available, that really is rather a long stop at the Motorway services. The whole plan with electric vehicles assumes, in my view falsely, that they will be used for short trips locally, and that Holidays will be taken by bicycle (or very locally). It also assumes that vehicle charging will be provided by someone else at zero cost to the EV owner and that fossil fuel-derived electricity may be used to power the car most of the time. In fact, the whole renewables "free electricity" plan is so flawed that it must have been dreamed up by an Oxbridge graduate in medieval architecture. No Engineer of any ability would contemplate such a system if they had to be responsible for the result and cost. The whole lot seems to mimic Crossrail and HS2, astronomical cost overruns, extreme lateness, and probably non-functionality when completed because the capacity planned is no longer correct. It sounds awfully like the Electricity system at the moment.
