In order to improve the flexibility of thermal power units

enhance the peak shaving capability of thermal power units coupled with molten salt heat storage system

and reduce project investment

a variety of electric heating molten salt energy storage systems coupled with thermal power plant were proposed. The thermal performance

peak shaving capacity and molten salt consumption of a 350 MW unit were analyzed with EBSILON software. An optimal system for deep peak shaving was proposed. The results show that

during the heat charging process

the electric heating system demonstrates a higher cycling efficiency as 33.2%

which enables the lowest power generation load to be reduced to below 25%. The flow rate of molten salt in this system is only 6.6%～31.2% to that of a steam heating system. During the heat discharging process

the water is drawn from the inlets of No.1 and No.2 high pressure heater. The water temperature is 182.4～242.7 ℃. The molten salt-condensed water heat exchanger is self-anti-condensation. The cycling efficiency during the heat discharging process is 32.7%～33.9% at different unit loads

indicating unit load has little effect on the cycling efficiency of the peaking shaving system. The research results can guide the engineering application of the deep peak shaving technology of thermal power units coupled with molten salt heat storage.