Electricity from power plants cannot be stored. In the power system , electrical energy is not stored, and the production, transmission, distribution and use of electrical energy are always in a state of dynamic balance. If the power supply and demand are not balanced, it will cause the power frequency deviation, then the power generation control device will dynamically adjust the output of the generator to maintain the balance of power supply and demand. When the system output is seriously insufficient or the frequency deviation is large, the low-frequency automatic load shedding device will automatically reduce the load to maintain the stability of the power system operation.
At present, the power grid load prediction accuracy is very high, and generally there is no large prediction error, that is, how much power is used to generate as much power, and there is no situation of excessive power generation.