Modelling and transient simulation of a supercritical coal-fired power plant: Dynamic response to extended secondary control power output

Conventional generation units are subject to a changing economic environment and have to adjust their role for modern society's power generation. With substantial amounts of renewable energy production encountering the markets, thermal power plants are facing an increased need for flexible operation and decreasing revenues from selling electricity. Technical adaptations are necessary, though have to be redeemed within very short time spans to secure the plant's profitability. Dynamic simulation in this context serves as a helping tool to evaluate technical improvements and is an established tool in industry as well as in research institutes. This paper focuses on the detailed modelling of a hard coal-fired power plant using the thermohydraulic simulation code Apros. Characteristic of this model is the implementation of the major part of the control system together with the physical model. The comprehensive model enables detailed dynamic simulations with very small error values to process data, as to be seen in the validation. As an application example, the extension of a qualified load jump for secondary control power is realised. The dynamic simulation is thereby used to clarify necessary modifications in the control system and to assess the implications on plant operation.

[1]  Dražen Lončar,et al.  Increasing flexibility of coal power plant by control system modifications , 2016 .

[2]  Karl Strauß.  Kraftwerkstechnik : zur Nutzung fossiler, regenerativer und nuklearer Energiequellen , 1992 .

[3]  Timo Siikonen,et al.  Numerical method for one-dimensional two-phase flow , 1987 .

[4]  Mathias Jesper Dahl-Soerensen,et al.  Pulverized Fuel Control using Biased Flow Measurements , 2009 .

[5]  H. Spliethoff,et al.  A parametric approach for the valuation of power plant flexibility options , 2016 .

[6]  Hartmut Spliethoff,et al.  Coupled simulation of a tangentially hard coal fired 700 °C boiler , 2014 .

[7]  H. Walter,et al.  Simulation von Kraftwerken und Feuerungen , 2012 .

[8]  Klaus Görner,et al.  Flexibilization of Coal-fired Power Plants by Dynamic Simulation , 2015 .

[9]  Bernd Epple,et al.  Fast start-up analyses for Benson heat recovery steam generator , 2012 .

[10]  Bernd Epple,et al.  Comparative investigation of drum-type and once-through heat recovery steam generator during start-up , 2015 .

[11]  Bernd Epple,et al.  Numerical and experimental study of a heat recovery steam generator during start-up procedure , 2014 .

[12]  Harald Weber,et al.  Modelling a Lignite Power Plant in Modelica to Evaluate the Effects of Dynamic Operation and Offering Grid Services , 2014 .

[13]  G. Köhn.  Staudinger 5: Auslegung und Erfahrungen aus Inbetriebnahme und Erster Betriebszeit , 1993 .

[14]  Bernd Epple,et al.  A comparative study of different dynamic process simulation codes for combined cycle power plants – Part B: Start-up procedure , 2015 .

[15]  Bernd Epple,et al.  Dynamic simulation of a triple-pressure combined-cycle plant: Hot start-up and shutdown , 2016 .

[16]  Jan Dimon Bendtsen,et al.  Derivation and validation of a coal mill model for control , 2009 .

[17]  Jochen Ströhle,et al.  Modeling and investigation start-up procedures of a combined cycle power plant , 2008 .