Study and Application on Primary Frequency Modulation Capability by Using Comprehensive Energy Storage of a 660 MW Water Heat and Power Cogeneration Supercritical Unit

doi:10.11930/j.issn.1004-9649.201904094

Abstract

Abstract: In this paper, the design parameters such as the heat balance diagram of a 660 MW water heat and power cogeneration supercritical unit are used to conduct the theoretical study based on the quantitative analysis of the primary frequency modulation capacity of condensate throttling and heat extraction throttling of the unit. Then the theoretical gain and rule of each throttling change corresponding to the unit power change are obtained respectively under the working conditions of 100%, 75% and 50% THA. Within the scope of safety control, the experimental study on primary frequency modulation capability in terms of comprehensive energy storage of the unit is carried out, hence the actual gain and rule of each throttling change corresponding to the unit power change as well as the actual capacity of primary frequency modulation in terms of comprehensive energy storage are calculated under the working conditions of 350 MW, 450 MW and 600 MW respectively. Based on the original primary frequency modulation control logic of the unit and in combination with the experimental results, a comprehensive energy storage module is developed for the primary frequency modulation of the unit. The simulation application demonstrates satisfactory results. The primary frequency modulation capability has met the related requirements and therefore indirectly improved the economic efficiency of the unit.

Key words: water heat and power cogeneration, supercritical unit, comprehensive energy storage, primary frequency modulation capacity, theoretical study, experimental study, application

CHEN Shunqing, YAN Jianping, ZHANG Yusheng. Study and Application on Primary Frequency Modulation Capability by Using Comprehensive Energy Storage of a 660 MW Water Heat and Power Cogeneration Supercritical Unit[J]. Electric Power, 2020, 53(1): 177-184.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201904094

https://www.electricpower.com.cn/EN/Y2020/V53/I1/177

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