Heat storage type steam heat supply network heat supply system with large load fluctuation and method

The invention discloses a heat storage type steam heat supply network heat supply system with large load fluctuation. The heat storage type steam heat supply network heat supply system comprises a heat supply heat source, a steam heat supply network module, a heat storage heat supply system module and an electric heating system module. On one hand, the high-temperature heat storage and energy storage system is used for achieving storage and release of surplus heat supply network steam, efficient utilization of heat energy of the heat supply network steam is achieved, meanwhile, an electric heat storage superheater is used as a secondary heat source, the problem that the steam temperature is reduced in the heat storage and release process is solved, and the heat supply steam grade is guaranteed; on the other hand, the method for achieving local heat supply through the heat storage technology is provided, the problem that the economical efficiency of a steam heat supply network is poor under the low-load condit