Using data reconciliation to improve the reliability of the energy evaluation of a gas-and-steam CHP unit

• Autorzy: Szega M.
• Języki publikacji: EN

Abstrakty

EN

The development of distributed control systems and automatic storage of measuring data permits a better supervision of processes of energy conversion. In most cases the running energy evaluation of these processes based on the raw measuring data. The paper deals with the application of the data reconciliation method in order to improve the reliability of thermal measurements of a gas-and-steam CHP unit. Identification of the thermal system of an example gas-and-steam CHP unit and its measurements system have been carried out. A mathematical model of investigated CHP unit equipped with a gas turbine, heat recovery steam generator, extraction-condensing steam turbine and heat exchangers has been presented. In the case of energy evaluation mainly balance equations of mass and energy are taken into account. From the data reconciliation method point of view a surplus of measurements information in the distributed control system of analyzed CHP unit has been found. As a conditional equations in the data reconciliation algorithm, mass and energy balances formulated so far within the model of gas-and-steam CHP unit have been applied. Data reconciliation calculations for analyzed gas-and-steam CHP unit have been carried out. The statistical test of control of the assumed uncertainty of raw measurements using variance-covariance matrix of measurements corrections has been applied. For global assessment of results of data reconciliation calculations a relative information entropy has been applied. The relative entropy – Kullback-Leibler divergence, which is a non-symmetric measure of the difference between two probability distributions, has been used. The necessity of data reconciliation method to increase reliability and uncertainty of measurements data in calculations of parameters characterizing the process of energy conversion in gas-and-steam CHP unit has been demonstrated. Usefulness of application of an information entropy for global assessment of reliability improvement of measurements after data reconciliation calculations has been presented.

Słowa kluczowe

EN

gas-and-steam CHP unit; evaluation of operation; data reconciliation; information entropy

PL

elektrociepłownia gazowo-parowa; ocena operacji; uzgodnienie danych; entropia informacji

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2015
• Tom: Vol. 95, spec.
• Strony: 91--99
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Szega M.

• Institute of Thermal Technology, Silesian University of Technology, Konarskiego 22, 44-100 Gliwice, Poland

Bibliografia

• [1] J. Szargut, Reconciliation Calculus in Thermal Engineering (in Polish), Polish Academy of Sciences, Ossolineum Publisher, Wrocław, 1984.
• [2] J. Szargut, A. Ziębik, Basics of Thermal Power Engineering (in Polish), 2nd Edition, PWN Publisher, Warszawa, 2000.
• [3] M. Szega, Application of Data Reconciliation Method for Increase of Measurements Reliability in the Power Unit System of a Steam Power Plant (in Polish), Silesian University of Technology Publisher, 2009, monography No. 193.
• [4] VDI-Richtlinien: Messunsicherheiten bei Abnahmemessungen an Energie - und kraftwerkstechnischen Anlagen, Grundlagen, VDI 2048, Blatt 1. Oktober 1998.
• [5] M. Szega, Advantages of an application of the generalized method of data reconciliation in thermal technology, Archives of Thermodynamics 30 (4) (2009) 219–232.
• [6] M. Szega, Calculation of thermal power of a heat recovery steam generator with reliability increase of the measurements by applying the data reconciliation, Rynek Energii 93 (2) (2011) 157–162.
• [7] Guide to the Expression of Uncertainty in Measurement. International Organization for Standardization, 1995.
• [8] Polish Standard PN-EN 12952-15. Water-tube boilers and auxiliary installations – Part 15: Acceptance tests. (in Polish). PKN Warszawa, 2006.
• [9] VDI-Richtlinien.: Messunsicherheiten bei Abnahmemesungen an energie- und kraftwerkstechnischen Anlagen, Beispiele, VDI 2048, Blatt 2. Dezember 2001.
• [10] M. Szega, Application of the data reconciliation algorithm in optimization of measurements location for calculation of thermal capacity of a steam boiler (in polish), Rynek Energii 87 (2) (2010) 149–153.
• [11] M. Szega, Application of the entropy information for the optimization of an additional measurements location in thermal systems, Archives of Thermodynamics 32 (3) (2011) 215–229.
• [12] C. Shannon, A mathematical theory of communication, The Bell System Technical Journal 27 (1948) 379–423, 623–656.
• [13] S. Kullback, R. Leibler, On information and sufficiency, Annals of Mathematical Statistics 22 (1) (1951) 79–86.

Uwagi

PL

Tytuł numeru spec. "Polish Energy Mix 2014"