Online Sliding Pressure Optimization of 1 000-MW Ultra Supercritical Unit Based on Valve Point Control

doi:10.11930/j.issn.10.11930.2015.11.1

Abstract

Abstract: Aiming at the existing problem in the optimization of sliding pressure, the effects of back-pressure vacuum and extraction volume on optimal sliding curve are analyzed for the condensing turbine. The online energy-saving control strategy targeting at valve point optimization is proposed, which can improve the response of main steam pressure and unit load in combination with CCS optimization. Thus the CCS control quality is enhanced and the main steam pressure can change along the optimal sliding curve quickly and smoothly. In this way the CCS control problem caused by sliding pressure optimization is resolved. Through the applications on two 1 000-MW ultra supercritical units, it is shown that the units are able to operate always along the optimal sliding pressure curve no matter how the ambient temperature or the extraction volume changes. Therefore, the objective of economic operation is achieved.

Key words: ultra super critical pressure unit, sliding pressure optimization, value point optimization, coordination control, energy saving

CLC Number:

TM621
TK37

ZHU Yaqing, ZHANG Xi. Online Sliding Pressure Optimization of 1 000-MW Ultra Supercritical Unit Based on Valve Point Control[J]. journal1, 2015, 48(11): 1-6.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.11.1

https://www.electricpower.com.cn/EN/Y2015/V48/I11/1

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