Comment How do power grids handle 1MW load swings? (Score 1) 178
Power grids are interesting in that at any given moment the power being consumed needs to match the power being generated; in theory every time you or someone else turns on or off a light, a generator somewhere needs to spin a little faster or slower. In the time lag between the light turning on and the corresponding generator speeding up, the frequency of the grid slows a bit until the corresponding generator speeds up. Realistically no single light (or small load) being turned on or off has impact because there are lots of lights being turned on and off and it all averages out. There are also things like the inertia of spinning mass and banks of capacitors and batteries that smooth the balance of grid consumption and generation. Power grids are engineered and tuned to handle a certain level of consumption swing.
Anyone here a grid engineer that has a real understanding (beyond my vague conceptual understanding) that can comment what a lot of 1MW swings (anytime someone plugs in or unplugs one of these truck chargers) does to a grid or grid design? Are 1MW "lights" being randomly turned on and off a challenge for our grids, or are or grids so large that even 1MW swings are just noise?