Calculation of Boiler Heat Storage Coefficient for Thermal Power Units Based on Primary Frequency Regulation Disturbance

doi:10.11930/j.issn.1004-9649.2017.03.071.06

Abstract

Abstract: The heat storage coefficient of the boiler is a key dynamic parameter of the load-pressure controlled object for thermal power units, of which the precise estimation provides important support for optimizing the coordinated control system. According to the simplified nonlinear dynamic model of the load-pressure object, the coordinated control system in the boiler following mode is established to analyze its closed-loop response characteristics using the frequency domain and the time domain methods. The results show that there are big differences in the time and frequency responses of the throttle pressure and the generation load outputs to the governor valve opening and the fuel flow inputs. It can be considered that the throttle pressure and the generation load are only affected by the governor valve opening within a small time scale. Therefore, the data under primary frequency regulation disturbance conditions in a short cycle are used to identify the boiler heat storage coefficient, which accuracy is good as that of the governor valve opening disturbance experiment. In addition, the feasibility of the methods is proved through the data identification and the field experiments in a 330 MW unit.

Key words: thermal power plant, boiler, boiler heat storage coefficient, coordinated control, primary frequency regulation, object model

CLC Number:

TM621
TP273

WEI Danjing, TIAN Liang, QIAO Hong, LIU Jizhen. Calculation of Boiler Heat Storage Coefficient for Thermal Power Units Based on Primary Frequency Regulation Disturbance[J]. Electric Power, 2017, 50(3): 71-76.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.03.071.06

https://www.electricpower.com.cn/EN/Y2017/V50/I3/71

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