WO2014019755A1

WO2014019755A1 - Power station system and method for operating such a power station system

Info

Publication number: WO2014019755A1
Application number: PCT/EP2013/062241
Authority: WO
Inventors: Nicolas Vortmeyer; Uwe Lenk; Gerhard Zimmermann
Original assignee: Siemens Aktiengesellschaft
Priority date: 2012-08-01
Filing date: 2013-06-13
Publication date: 2014-02-06

Abstract

The invention relates to a method for operating a power station system and to such a power station system, comprising an electrochemical storage unit (2), which is operated, in a charging state, for storing electrical power of an installation (100) for regeneration of electrical energy and, in a discharge state, for outputting electrical power, and which is in thermal interaction via a thermal interface (5) of a heat conduction system (6) with heat transfer medium (10) in the heat conduction system (6), and which is also coupled to a heat pump (15), which, by utilizing waste heat transmitted to the heat transfer medium (10), can increase the temperature level of the heat transfer medium (10) in the heat conduction system (6).

Description

description

POWER PLANT SYSTEM AND METHOD FOR OPERATING SUCH A POWER PLANT SYSTEM

The present invention relates to a method of operating a power plant system, comprising an electrochemical storage unit and a plant for the regenerative production of electrical energy, as well as such a power plant system.

Electrochemical storage units can include in a state of charge electrical charge and this in a che ^¬ mixed form suitable buffers. When charging or discharging the electrochemical storage unit, a conversion of a chemical storage species for storage or for the production of electrical power takes place. Depending on the design, such electrochemical storage units can be designed to ^receive or deliver larger or smaller amounts of electrical power.

Especially in the storage of electrical power plant services, especially for intermediate storage of excess current of a plant for regenerative production of electrical energy, sometimes occur high charge current densities, which can produce noticeable thermal losses in electrochemical storage units. Depending on the charging or discharging operation, the power loss can sometimes amount to 10% or more and is typically released as waste heat. Depending on the achieved current storage densities during charging or

Discharge state, the power loss can sometimes be well above 10%.

Electrochemical storage units can be used advantageously in connection with plants for the regenerative production of electrical energy, since such plants have a strongly fluctuating energy production. The fluctuation of the power generation, however, makes it in the interest of a host ^{¬-scientific} operation sometimes requires that excess electricity at times of an oversized power supply in the electricity supply networks of a different use or storage is supplied. A storage can be achieved here by means of a suitable electrochemical storage unit.

To the thermal power loss during the charging or

Discharge state to keep as low as possible in an electrochemical storage unit, the charge ^¬ or discharge current densities are typically lowered so that high

Waste heat losses can be largely avoided. Although the electrical efficiency can be increased by means of such precautions ge ^¬ other essential physical operating parameters are changed adversely. For example, the time required to charge or discharge an electrochemical storage unit is significantly increased.

This in turn can affect the storable electric power and thus on the economy of Be ^¬ drive. Furthermore, it is found that electrochemical spoke pure ^¬ units must reach a predetermined temperature level to achieve efficient operation, so that the running therein electrochemical processes can take place with sufficient speed. However, if the operating temperature is increased beyond a critical temperature further, it may be used to reduce the charging efficiency or

Discharge or even destroy the electrochemical storage unit come. Consequently, when operating an electrochemical storage unit of a power plant system, it is necessary to set and maintain an appropriate operating temperature. In addition, the operating temperatures during the discharge or charge state are to be suitably adapted to the extent that the electrochemical processes in the storage unit can proceed sufficiently fast, but the thermal power losses are as low as possible. In addition, the state of charge should allow the resulting excess electrical energy the system encompassed by the power plant system for the regenerative production of electrical energy can be absorbed quickly enough without this uneconomic losses must be accepted by discarding the amount of energy generated.

It is therefore an object of the present invention to propose a method for operating a power plant system, which has, in addition to an electrochemical storage unit, a plant for the regenerative generation of electrical energy, as well as such a power plant system, which are capable of the disadvantages of the prior art ver ^¬ avoid. In particular, it is an object of the present invention to ensure an energy-efficient operation of such a power plant system.

Here it should be noted that the present OF INVENTION ^¬-making should be limited only to the operation of power plant technology electrochemical storage units. Such electrochemical storage units are able to cache power plant services in combination or in combination with a power plant, in order to provide these at a later date an electrical supply network available. In particular, the present invention does not relate to batteries which are suitable for the intermediate storage of electrical services, as are required, for example, in the domestic or automotive field of application. Furthermore, the plants covered by the power plant system for the production of electrical energy should enable a regenerative power generation. Among other things, such regenerative energy sources are characterized by a high temporal variability of the generated electric power quantities. However, the caching of the variable amounts of energy requires not only a suitable circuitry for common use with an electrochemical storage unit, but also a storage technique which minimizes rich, sometimes time-varying charging and

Can support discharge cycles. At the same time, the high demands on the charge and discharge current densities must be met. Consequently, a common use of electrochemical storage units in connection with plants for regenerative energy production has different requirements to meet than about a common use of a elekt ^¬ rochemischen storage unit with a conventional power plant.

According to the invention, the ^{object of} the invention is achieved by a method for operating a power plant system according to claim 1 and by such a power plant system according to claim 9.

In particular, the the object underlying the invention by a method for operating a power plant system is ge ^¬ dissolves, which comprises an electrochemical storage device, the electrical in a charging state for storing electric power of a plant for the regenerative generation of electrical energy and in a discharge for discharging Power is operated, and which is in thermal interaction via a thermal interface of a heat conduction system with heat transfer ^medium in the heat conduction system, and which is further coupled to a heat pump, which method comprises the following steps:

Charging or discharging the electrochemical storage unit to generate waste heat by charging or discharging;

Transferring at least a portion of this waste heat to heat transfer medium in the heat pipe system;

Increasing the temperature level of heat transfer medium in the heat pipe system by operating the heat pump utilizing the transferred waste heat. Further, the object underlying the invention is achieved by a power plant system, comprising an electrochemical storage unit which is ^adapted to store in a charging ^¬ state electric power of a plant for regenerative production of electrical energy and emit electrical power in a discharging over a thermal interface of a heat pipe system with Wär ^¬ metransfermedium is in the thermal management system in thermal interaction, and which is further coupled to a heat pump that can increase with the use of transmitted to the Wärmetransferme ^¬ dium waste heat, the temperature level of heat Trans ^¬ fermedium in the heat pipe system.

According to the invention, the electrochemical storage unit is coupled to the heat pump for thermal conditioning of the heat transfer medium.

According to the invention, the waste heat generated during charging or discharging of the force ^¬ technical, electrochemical storage unit is transferred to heat transfer medium in a heat conduction system. The heat transfer medium is thermally conditioned as a result of this process, which sets a predetermined temperature level. However, in order to make heat transfer medium usable for further applications at a higher temperature level, heat energy is further supplied to the heat transfer medium by means of a heat pump. This additional thermal conditioning the Tempe ^¬ raturniveau can in particular be raised to the extent that process-technical applications such as in the low heat area (about 65 ° C to about 130 ° C) can be supplied with an appropriate amount of thermal energy.

The increase in the temperature level of heat transfer medium in the heat conduction system is achieved by operating the heat pump. pe using the transferred waste heat. It should be noted that the heat pipe system includes all those line sections, which thermally connect the electro ^¬ chemical storage unit to the heat pump, as well as those that are thermally coupled with the heat pump itself. The individual parts of the heat conduction system ^¬ therefore do not necessarily fluidly miteinan ^¬ the be connected, but may also include parts that are only thermally connected. Consequently, it is also not necessary that the heat transfer medium in the Wärmelei ^¬ processing system is uniform. Instead, different types of heat transfer ^{medium can} be provided in different parts of the heat conduction system that are not fluidly connected to one another.

In addition to increasing the temperature level of Wärmeübertragme ^¬ dium, the heat removal from the electrochemical storage unit allows the setting of a suitable

Operating temperature, but without having to discard the heat loss ^¬ occurring. Rather, the resulting heat is made available so far on the heat transfer medium, that sometimes can be supplied with heat at a later date, processes. This combination of available-made heat, setting a suitable operating temperature and suitable adjustment of the temperature level of heat transfer medium for further supplied with thermal processes - especially in the low-heat area - allowing the overall efficiency of the operation of the power system to raised stabili ^¬ hen.

By making use of the waste heat of the electrochemical storage unit can thus the overall efficiency of a power plant system consisting of a power plant electrochemical storage unit, the plant for regenerative The generation of electrical energy and a heat pump for the advantageous thermal conditioning of the heat transfer medium comprised of the heat transfer medium can be significantly increased.

Through the utilization of the waste heat of the electrochemical storage unit, the electro ^¬ chemical storage unit should also be ensured, Floating at a temperature level to be ^¬ which allows to transmit only fermedium much waste heat to the heat Trans, that this is not heated to a temperature level over a Work area of the heat pump is located. The heat transfer medium should therefore not be raised beyond the temperature level after interaction with the electrochemical storage unit, which should have it after the additional interaction with the heat pump. It should be noted that conventional, industrially used heat pumps typi ^¬ cally allow only an increase in the temperature level to 65 ° C to 130 ° C. However, an increase beyond that is entirely possible with corresponding parallel connections of several heat pumps or with heat pumps operating with a specially adapted heat fluid.

According to a first preferred embodiment of the inventive method that the heat Trans ^¬ fermedium is stored in a thermal storage according to a further step. Storage allows the utilization of the thermally conditioned Wärmeübertragme medium at a later date. Here, the information stored in the heat transfer medium heat either the power plant process, the storage process, or can be supplied to independent he ^¬ gen processes. Likewise, a backward swirling at a later time using the heat stored in the heat transfer medium is conceivable. A return Guidance in a power plant process can be done, for example, by preheating fuel from a gas turbine process or from intake air of a gas turbine process. More inde ^¬ pendent processes can relate, for example, the use of district heating.

According to an alternative embodiment of the invention it can be provided that heat of the heat transfer medium is transferred to a storage medium in a thermal store according to a further step. The storage medium allows about a suitable adaptation to the amount of heat to be stored between. Likewise, the storage medium can be chosen so that it is technically suitable for the temperature range which the storage medium should pass through during operation.

According to another embodiment of the erfindungsge ^¬ MAESSEN method it is provided that the step of ^¬ transmitting is performed at least a portion of the waste heat of the elektrochemi ^¬ rule storage unit on the heat transfer medium in a first part of the heat pipe system, and the step of increasing the temperature level of the heat transfer medium by operating , the heat pump in a second part of the Wärmelei ^¬ processing system which is not fluidly connected to the first part of the heat pipe system. Consequently, between the two parts of the heat conduction system, only a heat exchange, but no fluid exchange. The heat exchange can in turn be mediated by further heat processes of the heat pump.

According to a further development of this embodiment is that the heat transfer medium is different in the first part of the heat pipe system may be provided to the Wär ^¬ metransfermedium in the second part of Wärmeleitungssys- tems. By a suitable choice of heat transfer medium m the individual parts of the heat conduction system can thus be adapted to the technical requirements suitable. Above all, the embodiment allows a heat transfer adapted to the transfer of heat between the parts within the heat pump.

According to a further embodiment, it is also provided that the heat transfer medium and / or the storage medium in a further step with a heat exchanger of a water-steam cycle thermally interacts to thermally condition water in the water-steam cycle. This thermal conditioning step particularly follows the thermal treatment step of heat transfer medium by means of the heat pump. The conditioning can take place at different temperature levels. So it is ei ^¬ nerseits possible to heat water in the water-steam cycle to a temperature level which is below the Pha ^¬ senübergangsgrenze. Likewise, it is also possible by means of the heat transfer medium to transfer so much heat to the water in the water-steam cycle that a phase transition occurs. The water-steam cycle in turn is preferably suitable for converting the thermal energy into electrical energy in a steam process. This happens, for example, by means of a steam turbine process.

According to a further embodiment of the method according to the invention it is provided that the heat transfer medium and / or the storage medium thermally interacts in a further step with egg ner heating device, which is designed for the use of low-temperature heat. ^¬ low temperature heat to be heat at a temperature level of 65 ° C to at most 130 ° C in this case. According to the execution Heizvor ^¬ direction can be about a heater in the home as well as in be industrial area. Alternatively to this embodiment, it is also conceivable that the heat of the thermally kondi ^¬ tionierten heat transfer medium and / or the storage medium is dissipated in the thermal storage by means of a heat exchanger coupled to the heat exchanger. Consequently, the heat stored in the thermal store heat can be realized both by an outflow of heat transfer medium and / or storage medium or by an exclusive heat flow without fluid drain.

According to another preferred embodiment of the method it is provided that the electrochemical ^¬ mix storage unit in such a way in the state of charge or

Unloading is operated that an electrical efficiency of at most 90%, in particular of at most 70% is achieved, the power loss is the majority in waste heat transferred. The electrical efficiency is to be understood at ^¬ as electrical storage efficiency, that is the ratio of emitted upon full discharge amount of electric power and the amount recorded in the complete charging of electric power during a charge and discharge cycle ^¬ closing the storage unit here. Due to the operation of the electrochemical storage unit at a lower electrical efficiency higher thermal losses are generated in the form of waste heat. Operation under these conditions sometimes allows high current storage densities or discharge densities, which enable faster charging or discharging of the electrochemical storage unit. The simultaneously associated thermal losses are in accordance with execution of the overall efficiency of the method less significant, since the resulting waste heat can be transferred to the heat transfer medium in the heat conduction system suitable. According to a further advantageous embodiment of the method, it is provided that the electrochemical storage ^¬ unit during the state of charge and / or during the

Discharge state at a temperature level of at most 55 ° C, in particular of at most 45 ° C is operated. In particular, this temperature level allows the use of power plant compatible accumulators as electrochemical storage units, such as Li-ion batteries, commonly referred to as Li-ion batteries, that can be operated at room temperature.

According to the embodiment, it is also provided that the elevated temperature level of the heat transfer medium after operation of the heat pump at least 75 ° C, in particular at least 95 ° C be ^¬ contributes. This allows the supply of low-temperature industrial processes as well as the supply of heating devices in a domestic environment. Thus, a temperature limit of 75 ° C is desirable in a heating of household water used in the home, since at this temperature level ^¬ rich bacteria, such as Legionella, in the water can be easily abgeschgetö ^¬ tet.

According to a particularly preferred embodiment of the power plant system is provided that a thermal Spei ^¬ cher is included, which is thermally and / or fluidly connected to the heat conduction system and is designed for storage of heat transfer medium and / or storage of storage medium. The storage of thermally conditioned heat transfer medium and / or storage medium allows, as already stated above, a time nachge ^¬ stored use of the heat transfer medium and / or the storage medium for thermal utilization. In order to adapt the temperature level of the war metransfermediums taken from the memory or the storage medium suitable to the subsequent use, can also be provided that the thermal storage is heated by a heater.

It is also conceivable that the thermal storage is coupled via ei ^¬ nen heat exchanger with a water-steam cycle. As a result, the thermal storage directly thermal energy for use in a water-steam cycle can be taken ent ^¬ without heat loss due to transport of the heat transfer medium to another location must be taken into account. For example, a steam turbine process for Rückverstro determination can be supplied via the water-steam cycle.

As stated above in regard to the method, can also be provided in a power plant system in that the electrochemical storage unit comprises an electrical ^¬ rule efficiency of at most 90%, particularly from Hoechsmann least 70% during operation, the power loss is mostly converted into heat ,

According to a further preferred embodiment of the power plant system, the heat transfer medium and / or the storage medium is air. The heat transfer medium and / or storage medium according to the invention is particularly suitable, for example, for operating as well as for dissipating heat in the case of metal-air batteries which are supplied with air as the process gas. At the same time, air is also suitable as a cost-effective and un dangerous heat transfer medium or storage medium. Alternatively, the heat transfer medium and / or the storage medium may also be water. Water also allows a safe and cost-effective provision of a Wär ^¬ metransfermediums or a storage medium.

In order to transport larger amounts of thermal heat compared to the previous heat transfer media or storage media, thermal oil may be suitable. Consequently, the heat transfer medium or the storage medium may also be thermal oil.

It is also preferred ^{according to the} invention that the electrochemical storage unit comprises or is a lithium-ion battery. Lithium-ion batteries have an operating temperature of about 35 ° C to 45 ° C and thus allow the thermal ^¬ cal conditioning of the heat transfer medium to a Tempe ^¬ raturniveau above the ambient temperature level, but still well below the low temperature range of about 65 ° C to 130 ° C, on which it is only able to raise a thermal interaction with a heat pump.

In order to achieve an even higher level of heat, it is also conceivable that the power plant system further comprises a second heat pump, which is adapted to transfer heat ^¬ me from another heat reservoir to the heat transfer medium in the heat conduction system. Such a heat reservoir can, for example, through the groundwater, the district heating return, cooling water, exhaust air or exhaust gases or other Wär ^¬ mequellen be given. The second heat pump can also be controlled together with the heat pump according to the invention also.

The present invention will be explained in more detail below with reference to schematic figures. Here are the schematic representations represent no limitation with respect to a specific embodiment of the invention. It should also be noted that all the components shown in the following figure should be claimed alone as well as in its entirety.

Hereby show:

1 is a schematic representation of a first embodiment of a power plant system according to the invention;

2 shows a schematic representation of a second embodiment of a power plant system according to the invention.

The power plant system 1 shown in FIG. 1 comprises a power plant-specific electrochemical storage unit 2 which is fluidly connected to a thermal store 20 via a heat conduction system 6. Between electrochemical

Storage unit 2 and thermal storage 20 is a heat pump connected ^¬ 15, which allows the use of the discharged from the electrochemical ^¬ mix storage unit 2 waste heat to condition the heat transfer medium 10 suitable thermally in the heat pipe system. 6 Here, the heat conduction ^¬ system 6 comprises a first part 7, which is connected to the electrochemical ^¬ mix storage unit 2 and the heat pump 15, and a second part 7, which is connected to the heat pump 15 and the thermal storage 20th

In operation of the electrochemical storage device 2 in a charging state or in a discharge thermal From ^¬ heat is generated, which through a thermal interface 5 of the heat pipe system 6 to the thermal conduction in the system 6 located heat transfer medium 10 is transmitted. Here, the temperature level of the heat transfer medium 10 is, for example, raised from about 15 ° C to about 40 ° C. After the thermal interaction, the heat transfer medium 10 of the heat pump 15 is supplied, which transfers a portion of the waste heat from the heat transfer medium 10 to heat transfer medium 10 in the second part 8 of the heat conduction system 6. In this case, the temperature of the heat transfer medium 10 decreases after Wech ^¬ selwirkung with the heat pump back to eg. 25 ° C from. Subsequently, heat transfer medium 10 is in the second part 8 of the heat conduction system 6 to a thermal storage 20 to ^¬ out, in which it can be ^cached . By the operation of the heat pump 15, the heat transfer medium 10 in the second part 8 of the heat conduction system 6 is raised to, for example, 130 ° C. This temperature is consequently also present in the thermal store 20.

As an alternative to the described embodiment, it is also possible for the thermal store 20 to store a storage medium 11, to which the heat of the heat transfer medium 10 is transferred.

From the thermal store 20, the heat transfer medium 10 or the storage medium 11 can be removed for suitable heat utilization at a later time according to an embodiment. Example, it is. Possible, the heat transfer Medi ^¬ to 10 or the storage medium 11 to a not shown water-steam circuit 40 and a heater lead 50 zuzu ^¬.

The electrochemical storage unit 2 is supplied with electrical energy from a system 100 for rege ^¬ nerative generation of electrical energy at a Ladezu ^¬ . This system is preferably a photovoltaic system, but can be ausgebil ^¬ det as biogas, geothermal or wind power plant. The storage of electrical energy during the charge state is symbolically veran by an arrow 110 illustrates ^¬. Likewise, during a discharge state, the electrochemical storage unit 2 can emit electrical energy as needed. This is exemplified by the arrow with the reference numeral 120.

In order to suitably adjust the temperature level of the heat transfer medium 10 or the storage medium 11 in the thermal store 20, is execution according to henceforth provided that a heating device 35 allows a further thermal Konditionie ^¬ tion of the heat transfer medium 10th The Heizeinrich ^¬ tung 35 may be formed as a resistance heater and allowed to deliver the heat generated directly in the thermal storage 20th

According to another embodiment, the present in the thermal store 20, thermal energy can be removed with ^¬ means of a heat exchanger 30 therefrom. The so extracted heat can then, for example. A not ge ^¬ showed Effective cycle, eg. A water-steam cycle are led to ^¬ acting together as a not shown steam turbine, and uses the extracted heat for reconversion.

The heat pump 15 allows heat of the heat present Trans ^¬ fermediums 10 in the first part 7 of the heat pipe system 6 to the heat transfer medium 10 in the second part 8 of the heat transfer system to transfer. 6 For this purpose, the heat pump can sometimes have an electrically driven compressor which compresses a compression fluid and thus gleichzei ^¬ tig raises to a higher temperature level. According to the embodiment, the compression fluid also has heat, which is the heat Heat transfer medium 10 was removed in the first part 7 of the heat conduction system 6. The compressed compres- onsfluid are, in turn, this heat back to the heat Trans ^¬ fermedium 10 in the second part 8 of the heat pipe system 6, so that the temperature level of this heat transfer medium can be increased in accordance with the tenth Subsequently, the compressed compression ^fluid is typically ^un- tensioned again, wherein the temperature level of the compression fluid is lowered again.

2 shows a further embodiment of the invention, which differs from the embodiment of FIG. 1 essentially only in that the thermal reservoir 20 only has a heat exchanger 30 (shown in dashed lines), the heat exchange, but no fluid exchange with a water-steam cycle 40 allows. The water-steam circuit 40 is also connected to the thermal storage 20. The water-steam circuit 40 may also be replaced by a district heating supply circuit.

Further embodiments emerge from the subclaims.

Claims

claims

A method for operating a power plant system (1), ^{comprising ¬} an electrochemical storage unit (2), which in a state of charge for storing electrical power of a plant (100) for the regenerative production of electrical energy and in a discharge state for the delivery of elektri ^¬ is operated by a thermal interface (5) of a heat conduction system (6) with heat transfer medium (10) in the heat conduction system (6) in thermal interaction, and which is further coupled to a heat pump (15) which Procedures following

Steps:

Charging or discharging the electrochemical storage unit (2) to generate waste heat by charging or discharging;

Transmitting at least a portion of said waste heat to Wär ^¬ metransfermedium (10) in the heat pipe system (6); Increasing the temperature level of heat transfer medium (10) in the heat pipe system (6) by operating the

Heat pump (15) using the transferred waste heat.

2. Method according to claim 1,

d a d u r c h e s e n c i n e s, d a s s

the heat transfer medium (10) is stored in a thermal store (20) according to a further step.

3. Method according to claim 1,

d a d u r c h e s e n c i n e s, d a s s

Heat of the heat transfer medium (10) on a storage medium

(11) is transferred in a thermal store (20) according to a further step.

4. Method according to one of the preceding claims, d a d u c h e c e n e c e s e s, d a s s

the step of transmitting at least a portion of the Abwär ^¬ me of the electrochemical storage unit (2) to heat Trans ^¬ fermedium (10) in a first part (7) of the Wärmeleitungssys- 6), and the step of increasing the tempera ^¬ turn level of heat transfer medium (10) by operating the heat pump (15) in a second part (8) of the heat conduction ^¬ system (6), which with the first part (7 ) of the heat conduction system (6) is not fluidly connected.

5. The method according to claim 4,

d a d u r c h e s e n c i n e s, d a s s

the heat transfer medium (10) in the first part (7) of the heat meleitungssystems (6) is different from the heat Trans ^¬ fermedium (10) in the second part (8) of the Wärmeleitungssys ^¬ tems (6).

6. Method according to one of the preceding claims, d a d u c h e c e n e c e s e s, d a s s

the electrochemical storage unit (2) is operated in such a manner in the loading ^¬ state or discharging state that an electrical ^¬ shear efficiency of at most 90%, particularly from Hoechsmann ^¬ least 70% is achieved, the power loss lent mehrheit- is converted to waste heat.

7. Method according to one of the preceding claims, d a d u c h e c e n e c e n e, d a s s

the electrochemical storage unit (2) during the charge status and / or during the discharge state in a tempering ^¬ raturniveau of at most 55 ° C, in particular at most 45 ° C is operated.

8. Method according to one of the preceding claims, d a d u c h e c e n e c e s e s, d a s s

the increased temperature level of the heat transfer medium (10) to operate the heat pump (15) is at least 75 ° C, insbeson ^¬ particular at least 95 ° C.

9. power plant system (1), comprising an electrochemical storage unit (2), which is adapted to store in a state of charge electrical power of a plant (100) for rege ^¬ nerative generation of electrical energy and dispense electric power in a state of unloading, which has a thermal interface (5) of a heat conduction ^¬ system (6) with heat transfer medium (10) in the Wärmelei ^¬ processing system (6) in thermal interaction, and WEL further che with a heat pump (15 coupled with the use of heat transferred to the heat transfer medium (10) waste heat, the temperature level of heat transfer medium (10) in the heat conduction system (6).

10. Power plant system according to claim 9,

d a d u r c h e s e n c i n e s, d a s s

a thermal store (20) is included which is thermally and / or fluidly connected to the heat conduction system (6) and is designed to store heat transfer medium (10) and / or to store storage medium (11).

11. Power plant system according to claim 10,

d a d u r c h e s e n c i n e s, d a s s

the thermal store (20) can be heated by means of a heating device (35).

12. Power plant system according to one of claims 9 to 11, d a d u c h e c e n e c e n e, d a s s

the electrochemical storage unit (2) comprises a lithium-ion battery or is.

13. Power plant system according to one of claims 9 to 12, d a d u c h e c e n e c e s e s, d a s s

The power plant system (1) further comprises a second heat pump, which is designed to transfer heat from a wide ^¬ ren heat reservoir to the heat transfer medium (10) in the heat pipe system (6).