Extreme Scenarios of High Percentage of Renewable Energy Connected to Power System: A Review on System Power and Electricity Balance Aspect

The intensification of global climate change has brought about more and more extreme weather events, which, combined with the stochastic and volatile nature of renewable energy sources, have caused serious impacts on the power system, and consequently, preserving the supply and promoting the consumption have become two major problems in the power system in terms of the balance of power. Based on this, the extreme scenarios in the high proportion of renewable energy connected to the power system are studied. Firstly, the difference and connection between extreme scenarios and extreme events and the worst scenarios are clarified, the definition and characteristics of extreme scenarios are given, classification methods and identification methods of extreme scenarios are analyzed; subsequently, the generation methods of extreme scenarios are studied for the small-sample characteristics of extreme scenarios; furthermore, the application of extreme scenarios in the scheduling of the power system, flow analysis, and planning is summarized; Finally, countermeasures for extreme scenarios are proposed, and the direction of subsequent research on extreme scenarios is pointed out, which provides ideas for the subsequent construction of a flexible and reliable power system with balanced supply and demand.