Holy Red Herrings, Batman! It's almost as if I wrote "If you have HVDC, and and solar power generation in a single geographic region suddenly become stable", rather than what I actually wrote:
Probably the best thing you can do is simply have a powerful HVDC grid so you can move power between different geographic regions and to use different types of renewables techs
Even in Germany, solar plus wind alone is much less random than purely solar or purely wind. But combined over a broad geographic region, the figures are surprisingly stable. HVDC lines also (their main purpose today) link you up with other regions so that you can use them as peaking when you need it and they don't (esp. regions with hydro, since hydro is much more total-energy-limited than power-limited, and nameplate power capacity can be uprated if necessary with little ecological impact and proportionally very small cost).
then your "high voltage DC net" myth will collapse.
Which is why Germany and Denmark are in a constant state of blackout?
Honest policy by a - say - PHD-in-physics politico would be to demand storage for at least 5 days for every Watt of "renewable" power installed.
That argument of yours makes no sense, since it doesn't account for capacity factor or generation profiles.
It would mean lifting up the entire lake constance by dozens of meters.
This claim is unevaluatable without knowing how much backup energy you're meaning to provide.
But if you are just a fucking liar with a physics PHD, you skip the storage.
Storage and peaking generation are 100% interchangeable. You can use any combination of either. And as stated, the need for either storage or peaking generation depends on the randomness of the supply, and 1) the more types of sources you use, and 2) the broader the geographic area you collect from, the less net randomness in the generation.
It should be noted that the power grid today is already highly random - not in terms of supply fluctuations, but demand fluctuations. Nighttime demand averages about a third of daytime generation, and there are sudden spikes and dropoffs at certain times of day. The current approach to the grid - peaking - deals with high levels of randomness just fine.
(it should also be noted that HVDC across time zones also helps you level out time-of-day demand spikes)