| 摘要 |
The invention relates to a storage device for the temporary storage of electrical energy in the form of heat energy, with electrical network connection means for establishing an electrical connection to an external power network, with a first heat storage group having at least one first heat storage unit, comprising first electrical heating means for generating heat energy from electrical energy, wherein the first electrical heating means are connected to the electrical network connection means, a first heat storage medium, which is a metal, a first heat exchanger for transferring stored heat energy from the first heat storage medium to a working fluid, with a heat engine-generator unit for converting heat energy into electrical energy, wherein the heat engine-generator unit is connected to the electrical network connection means for emitting generated electrical energy via the electrical network connection means, and with a line system for supplying a working fluid from the first heat storage group in the direction of the heat engine-generator unit. According to the invention, a second heat storage group is provided having at least one second heat storage unit. Same comprises second electrical heating means, a second heat storage medium, which is a metal, and a second heat exchanger. The line system is configured in such a way that a working fluid can be conducted from the first heat storage group to the second heat storage group and onwards to the heat engine-generator unit. The invention also relates to a corresponding method for operating a storage device for the temporary storage of electrical energy in the form of heat energy. |
