Prospective Integration of Renewable Energies with High Capacities Using Combined Heat and Power Plants (CHP) with Thermal Storages

Schmidla, Tim; Stadler, Ingo

doi:10.1016/j.egypro.2016.10.119

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…TES stores either warm or hot water as well as steam. Hot water tank sizes range from some 100 dm 3 for single buildings to 50,000 m 3 for large DH networks. The corresponding capacities in MWh depend on the temperature differences and on the temperature levels of the entire heating system [42].…”

Section: Supporting Technologies 241 Heat Storagementioning

confidence: 99%

Role of thermal technologies for enhancing flexibility in multi‐energy systems through sector coupling: technical suitability and expected developments

Witkowski

Paul

Seidelt

et al. 2020

IET Energy Systems Integration

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Thermal power generation technologies are widely used for electricity production, for heat provision in district or process heating systems, and for combined heat and power generation. In most cases, thermal technologies are heat driven and electricity is produced as a by-product, thus resulting in a non-flexible behaviour of the electricity production. Modern power grids are characterised by an increasing share of renewable leading to a need for enhanced and flexible ways of controlling the power flow. To provide services to the power grid, thermal generating technologies may be used in a more efficient way, coupled to gas and heat storage systems or aggregated in virtual power plants. Several technical factors determine which technologies are suitable for flexibility provision, including power ranges, start up times and ramp rates. In this work, carried out in the frame of the MAGNITUDE H2020 project, the technical characteristics of thermal sector-coupling technologies were analysed using data from the seven real-life project's case studies. The technical suitability was determined based on the product requirements in selected European power markets for the provision of identified system services. Expected future developments and trends were highlighted well.

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Section: Supporting Technologies 241 Heat Storagementioning

confidence: 99%

Role of thermal technologies for enhancing flexibility in multi‐energy systems through sector coupling: technical suitability and expected developments

Witkowski

Paul

Seidelt

et al. 2020

IET Energy Systems Integration

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“…However, the technology risk, long construction times, and still inefficient energy storage solutions continue to curb the development of this technology. Generally, even with increasing the number of variable renewable energy plants, there will be the same period during the day in which the energy produced exceeds power demand …”

Section: Introductionmentioning

confidence: 99%

“…Generally, even with increasing the number of variable renewable energy plants, there will be the same period during the day in which the energy produced exceeds power demand. 4 Concentrated solar power depends on the availability of direct sunlight. Hence, energy storage systems and more flexibility are highly needed 5 to increase the capacity factors of solar-powered plants and to correct the mismatch between the discontinuous renewable energy supply and demand.…”

Section: Introductionmentioning

confidence: 99%

Solar-Powered Rankine Cycle Assisted by an Innovative Calcium Looping Process as an Energy Storage System

Cannone

Stendardo

Lanzini

2020

Ind. Eng. Chem. Res.

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Solar energy is an intermittent resource, and thus an energy storage system is required for practical applications of the collected solar irradiance. This work deals with the integration of a thermo-chemical energy storage (TCES) system based on the calcium looping (CaL) process with a concentrated solar tower power (CSP) plant. The objective of this work is the integration of a conventional 320 MWe Rankine cycle with a direct calcination for energy harvesting. Particularly, this work addresses the use of CO 2 as the working fluid of a compressed-gas energy storage (CGES) system for hybrid energy storage with the CaL process. The hybrid TC/CG-ES (thermo-chemical/compressed-gas energy storage) system can increase the competitiveness of the CSP with respect to conventional fossil-based power plants leading to a reduction in CO 2 emissions. The thermal integration with the calcium looping (CaL) system is optimized by means of the pinch analysis methodology. The obtained results show a reduction in the electrical efficiency of about four percentage points with respect to the conventional Rankine power cycle without the CSP unit: the net electrical efficiency reduces from 43.7% to 39.5% while the global (thermal and electrical) efficiency of the plant reaches the peak value of 51.5% when low enthalpy energy is recovered (e.g., district heating network, district cooling network). This paper highlights the importance of the thermochemical CaO based material. With a conversion of CaO to CaCO 3 of 80% the storage efficiency is defined as the ratio of the energy released during the carbonation and the CO 2 expansion to the energy collected by the solar field and required during the CO 2 compression, which is 87.3%.

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“…In 2015 11 % of the gross electricity consumption in Germany was due to general CHP-systems [4]. It has been shown that CHP system with an intelligent controller can lead to a better grid integration, provide grid services or can be part of a virtual power plants (VPP) [5], [6], [7]. The combination of both systems seems to be a promising step towards a combined electrical and thermal power supply.…”

Section: Introductionmentioning

confidence: 99%

Flexibility potentials of a combined use of heat storages and batteries in PV-CHP hybrid systems

Kneiske

Braun

2017

Energy Procedia

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Due to the 2012 change in the renewable energy act the feed-in tariffs and as result the number of newly installed photovoltaic systems decreased dramatically in Germany. Therefore, there was the need, particularly, in the residential sector to develop new business ideas for photovoltaic systems. In context of this development, combined photovoltaic and heat-power systems were analyzed, which provide not only electricity but also heat throughout one entire year. Flexibilities are provided in form of thermal and electrical storage systems leading to many possible setting options requiring an elaborated control management. In this paper, a new optimized control algorithm is proposed that in contrast to standard strategies can operate optimal even under incorrect weather and load forecasts. A predictive controller based on a mixed integer optimization problem and an additional so called secondary, rule-based controller is combined. The controller is based on several input data. Depending on the choice of these data the PV-CHP hybrid system can be used for different control strategies, like maximum selfconsumption, minimum CO 2 emission or minimum operational costs. The main focus in this paper is to study if the flexibility potentials of the combined thermal and electrical storage systems can ensure a market oriented or a grid-friendly behavior. This is studied in five control options. As a result we found that the control algorithm is stable and able to adapt to the different conditions. In conclusion, it was discovered that the storage systems play a crucial role in terms of forecast differences and parameter changes. Storage systems are as expected the key-element for the flexibility of PV-CHP hybrid systems.

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Prospective Integration of Renewable Energies with High Capacities Using Combined Heat and Power Plants (CHP) with Thermal Storages

Cited by 7 publications

References 1 publication

Role of thermal technologies for enhancing flexibility in multi‐energy systems through sector coupling: technical suitability and expected developments

Role of thermal technologies for enhancing flexibility in multi‐energy systems through sector coupling: technical suitability and expected developments

Solar-Powered Rankine Cycle Assisted by an Innovative Calcium Looping Process as an Energy Storage System

Flexibility potentials of a combined use of heat storages and batteries in PV-CHP hybrid systems

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