Learn more about the possibilities of ClaRa+:
Create a digital twin of your power plant, investigate transient behavior and gain greater understanding to optimize your processes for use in the future energy market. Use ClaRa+ to support all project phases - from evaluation of concept variants to component design, optimization of control technology, virtual commissioning and optimization during operation.
Optimization of steam generators
- ClaRa+ enables you to analyze natural and forced circulation boilers as well as once-through boilers.
- Improve your control design by implementing in-depth, simulation-supported knowledge of fuel preparation, combustion and fault propagation.
Optimization of water-steam cycles
- ClaRa+ allows you to design and analyze extensive preheating sections and to consider all relevant storage tanks (condenser, feed water tank, atmospheric storage).
- ClaRa+ allows you to analyze process efficiencies under transient conditions and partial loads.
Optimization of process transients
- The models provided by ClaRa+ allow for detailed and precise analysis of process transients.
- ClaRa+ supports you with prequalification for primary and secondary control services. ClaRa+ helps you safely control failures of aggregates such as pumps, fans, turbines and mills.
Design of components
- ClaRa+ helps you design tanks (drum, storage tank, feed water tank) and quick-closing valves while taking into account extremely dynamic operating conditions.
Development of process controllers
- ClaRa+ enables stability analyses and optimization of control systems.
- ClaRa+ allows for safety-related evaluations of step sequences in the event of a malfunction.
Prevention of critical system states
- ClaRa+ allows for safe analysis of potentially dangerous or component-damaging operating conditions.
- ClaRa+ helps you avoid cavitation in pumps and evaporation in liquid lines—by constructive means or intelligent control.
Analysis of cogeneration power plants
- ClaRa+ makes it possible to consider all relevant process limits as well as the operating limits of components and aggregates in interaction.
- Improve the reliability and efficiency of your production site.
Meeting grid requirments
- ClaRa+ enables global performance analysis of transmission networks.
- Optimize your site's power consumption and energy costs.
Analysis of combined cycle power plants
- ClaRa+ supports the analysis of power plants under consideration of connected electric grids and district heating.
- Optimize your power plant site with focus on changed market situations.
Validation and qualification
- The models are qualified and validated using both isolated component testers and using connected overall models. The developers work closely together with users from the industry and scientists.
- Source: University of Duisburg-Essen, Chair of Environmental Process Engineering and Plant Design, diagram accepted for publishing at the Modelica Conference 2015, Paris.
ClaRa+ is a library of power plant components programmed in the Modelica model description language. It enables users to dynamically simulate power plants and answer current questions concerning power plant operation. Dymola software is used for translation and simulation and as the main development environment.
Are you interested in our product? Write us an e-mail. We would be happy to provide you with information.E-Mail
Would you like to test our product? You can download a demo version of ClaRa+ that has a reduced scope.
As experts in modeling and simulating power plants and complex energy systems, we would be pleased to help you answer your questions.
Entrust us with your problems, we will find a solution. You will save license fees and we can start solving your problem directly and competently.
- Concept studies and concept evaluations.
- Evaluation of dimensioning.
- Design and optimization of control systems.
- Virtual commissioning.
We support you in building up know-how:
- Become an expert in power plant simulation with a three-day course.
- Get to know the scope of ClaRa+.
- Create a dynamic power plant model as an example.
- On request, we can adapt course content to your needs and train you at your premises.
We support your simulation team flexibly and competently:
- We model and implement the steam generators, heat exchangers, pumps, valves and controllers installed at your site.
- We calibrate and parameterize models according to data sheets or measurements.
- Get help at short notice.
- Benefit from our further developments.
- We assist you with your projects in an advisory capacity.
Are you interested in our services? Write us an e-mail. We would be pleased to provide you with information.
Training & Support
XRG Simulation GmbH and TLK-Thermo GmbH offer training and support packages that enable you to start modeling power plant processes with ClaRa/ClaRa+.
ClaRa+ and demo version ClaRa, available under Modelica license version 2.0, are used by more than 50 users worldwide. Learn more about some selected success stories below:
Optimization of the control and process technology of the 'Schwarze Pumpe' lignite-fired power plant
- In this project a detailed model of the 'Schwarze Pumpe' power plant was created with ClaRa. This model included the
entire water-steam cycle, the flue gas and air path, the coal mills and a digital image of the control technology.
It enabled the rapid analysis and evaluation of control and process engineering changes, such as increased load
change gradients, optimized controller parameterization in partial load or increased provision of control power.
Project manager Sebastian Meinke says, "ClaRa is ideal for creating a digital twin of the power plant and quickly identifying optimization potential. The possible savings exceed the costs many times over." (translated)
Design and transient analysis of a supercritical CO2 Brayton cycle
- The ClaRa software was successfully deployed in the Horizon 2020 project sCO2-HeRo for component design and transient system analysis.
The objective of the project was to develop a technology based on a sCO2 simple Brayton cycle that safely, reliably and efficiently
removes residual heat from nuclear fuel without the requirement of external power sources, making it an excellent backup cooling system
for the reactor core in the case of a station blackout and loss of ultimate heat sink.
Ales Vojacek, CVR: "With the ClaRa I have designed a finned-tube air-CO2 heat exchanger fast and efficiently and could right afterwards evaluate its transient behaviour in the total system."
Research project DYNSTART
- In this ongoing research project, ClaRa is used to simulate the dynamic behavior of coal-fired power plants with carbon dioxide capture. The main focus of the research project is the development, optimization and testing of new control concepts for a low load range, start-up and shutdown. For this purpose, models of existing power plants are created and validated with measured data. Due to the multi-domain capability of the software, the power plant, the carbon dioxide capture plant and the control system are modelled with the help of ClaRa and tested in interaction.
- Project partners: Technical University Hamburg-Harburg, Vattenfall AB, EnBW Kraftwerke AG, Uniper, TLK-Thermo, XRG-Simulation.
Research project DYNCAP
- The aim of this research project was to investigate the dynamic behavior of coal-fired power plants with carbon dioxide
capture and to identify the potential for providing control energy.
Power plant models were built within the ClaRa environment, validated with measured data and coupled with a post-combustion plant model. These models were used to optimize operation, identify critical interfaces and develop concepts for the supply of control energy through the utilization of process memories.
- Project partners: Technical University Hamburg-Harburg, Vattenfall AB, EnBW Kraftwerke AG, E.On Energie AG, TLK-Thermo, XRG-Simulation.
Download ClaRa now!
The free demo version ClaRa gives a good overview of the possibilities of power plant simulation and enables conceptional studies. The commercial version ClaRa+ offers extra content, is more user-friendly and supports the component design due to precise detail models. For translation, simulation and as a main development environment, we recommend commercial software Dymola.Download ClaRa
- Flyer Software // Download (pdf)
- Flyer Services // Download (pdf)
- Training description // Download (pdf)
- „ClaRa+ Quality Management: On Validation of Implemented Physics“ // Download (pdf)
- „ClaRa+ Quality Management: Efforts for Certification According to ISO 9001:2008“ // Download (pdf)
- Presentations ClaRa User Meeting from June 4th, 2019 // Download (zip)
-  Johannes Brunnemann , Friedrich Gottelt, Kai Wellner, Ala Renz, André Thüring, Volker Röder, Christoph Hasenbein, Christian Schulze, Gerhard Schmitz, Jörg Eiden: „Status of ClaRaCCS: Modelling and Simulation of Coal-Fired Power Plants with CO2 capture“, 9th Modelica Conference, München, 2012 // Download (pdf)
-  Volker Roeder, Christoph Hasenbein, Alfons Kather, Kai Wellner, Gerhard Schmitz, Johannes Brunnemann, Friedrich Gottelt, Ala Renz, Christian Schulze, André Thüring: „Das Projekt DYNCAP: Untersuchung des dynamischen Verhaltens von Dampfkraftprozessen mit CO2-Abtrennung zur Bereitstellung von Regelenergie“, Proceedings of the 44th Conference on Power Plant Technology, Dresden, Oktober, 23–24, 2012
-  Alfons Kather, Volker Roeder, Christoph Hasenbein, Gerhard Schmitz, Kai Wellner, Friedrich Gottelt, Lasse Nielsen: „DYNCAP Dynamische Untersuchung von Dampfkraftprozessen mit CO2-Abtrennung zur Bereitstellung von Regelenergie“, Abschlussbericht, Technische Universität Hamburg-Harburg, TLK-Thermo GmbH, XRG Simulation GmbH, 2015 // Download
-  Friedrich Gottelt, Kai Wellner, Volker Roeder, Johannes Brunnemann, Gerhard Schmitz, Alfons Kather: „A Unified Control Scheme for Coal-Fired Power Plants with Integrated Post Combustion CO2 Capture“ Proceedings of the In 8th IFAC Conference on Power Plant Power System Control, Toulouse, Frankreich, 2012 // Download
-  Marcel Richter, Florian Möllenbruck, Andreas Starinski, Gerd Oeljeklaus, Klaus Görner: „Flexibilization of coal-fired power plants by Dynamic Simulation“ Proceedings of the 11th Modelica Conference, Paris, 2015 // Download (pdf)
-  C. Gierow, M. Hübel, J. Nocke, E. Hassel: „Mathematical Model of Soot Blowing Influences in Dynamic Power Plant Modelling“ Proceedings of the 11th Modelica Conference, Paris, 2015 // Download (pdf)
-  K. Wellner, T. Marx-Schubach, G. Schmitz: „Dynamic Behavior of Coal-Fired Power Plants with Postcombustion CO2 Capture“ Industrial & Engineering Chemistry Research, 2016 // Download (pdf)
-  Friedrich Gottelt, Timm Hoppe, Lasse Nielsen: „Applying the Power Plant Library ClaRa for Control Optimisation“ Proceedings of the 12th Modelica Conference, Prag, 2017 // Download (pdf)
-  J. Prause, M. Hübel, D. Holtz, J. Nocke, E. Hassel: „Local steam temperature imbalances of coal-fired boilers at very low load“ Energy Procedia 120, 2017 // Download
-  Marcel Richter, Gerd Oeljeklaus, Klaus Görner: „Improving the load flexibility of coal-fired power plants by the integration of a thermal energy storage“, Applied Energy, Volume 236, 15 February 2019, Pages 607-621
-  Vojacek, A., Dostal, V., Goettelt, F., Rohde, M., Melichar, T. (February 11, 2019) „Performance Test of the Air-Cooled Finned-Tube Supercritical CO2 Sink Heat Exchanger.“ ASME. J. Thermal Sci. Eng. Appl. June 2019; 11(3): 031014 // https://doi.org/10.1115/1.4041686
-  Vojacek, Ales / Melichar, Tomas / Hájek, Petr / et al: „Experimental investigations and simulations of the control system in supercritical CO2 loop“, 3rd European Conference on Supercritical CO2 (sCO2) Power Systems, Paris, France, (02.10.2019), p. 89-104 // https://doi.org/10.17185/duepublico/48916
-  T. Hoppe, J. Braune, L. Nielsen: „Dynamic System Simulation for New Energy Markets - Optimization of a Coal Fired Power Plant Startup Procedure“ VGB PowerTech 9|2019 // Download (pdf)
-  Marcel Richter, Gerd Oeljeklaus, Klaus Görner: „Dynamic simulation of flexibility measures for coal-fired power plants”, VGB PowerTech 4|2020 // Download (pdf)