Thermo-economic Analysis on Four Regulation Schemes with Different Flexibilities for Primary Frequency Regulation Control in a Coal-Fired Power Plant

doi:10.11930/j.issn.1004-9649.201903017

Abstract

Abstract: Achieving high operational efficiency and flexibility of coal-fired power plants is an effective way to improve the security of power grids. In this study, the dynamic model of a 660 MW supercritical coal-fired power plant is developed via the GSE software, and then the dynamic characteristics of the main thermo-economic parameters and heat storage using four regulation schemes during the primary frequency regulation process are explored. After the thermo-economic index is defined for the primary frequency regulation, the deviations from average standard coal consumption rate with respect to different time durations of the four regulation schemes are analyzed. It turns out that during the primary frequency regulation load ramping up process, the output power of steam turbine and the total efficiency of power plant get boosted sharply with all the four regulation schemes, whereas the standard power generation coal consumption rate goes down in an opposite way. The basic reason for those four schemes eligible to participate in primary frequency regulation is explained as the heat storage reduction of both the boiler and steam turbine systems. The deviation from the average standard coal consumption rate hit the minimum value of -22.15 g/(kW·h), when the scheme of throttling extraction steam from high-pressure heaters is applied with the primary frequency regulation time duration set as 90 s.

Key words: coal-fired power generation unit, primary frequency regulation, operational flexibility, dynamic simulation, power generation standard coal consumption rate

CLC Number:

TM611.1

LUN Tao, E Zhijun, ZHANG Li, WANG Xin, ZHAO Yongliang, YAN Junjie. Thermo-economic Analysis on Four Regulation Schemes with Different Flexibilities for Primary Frequency Regulation Control in a Coal-Fired Power Plant[J]. Electric Power, 2019, 52(8): 164-172.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201903017

https://www.electricpower.com.cn/EN/Y2019/V52/I8/164

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