Study on the Simulation of Rotor Life Loss after Unit Load Shedding

doi:10.11930/j.issn.1004-9649.201711245

Abstract

Abstract: Due to the influence of the external power grid or the fault of the unit itself, the units in a power plant may suffer from severe operating conditions such as load shedding. To solve this problem, in this paper, a real-time evaluation method for rotor's life loss is proposed by analyzing the unit load shedding process. First, the dynamic model of steam turbine is established to simulate the load shedding process; then the rotor life loss is estimated by the established rotor life loss analysis module, and is applied to analyze the load shedding of a 1 000 MW ultra supercritical unit. When the unit sheds a load, its speed increases rapidly, and the loss of the rotor life increases with the increase of the speed. The analysis results show that the load shedding will inevitably lead to the life loss of the turbine rotor. Although the life loss caused by a single load shedding is small, the cumulative damage to the rotor life of the large capacity regulation units which shed load frequently is significant. Therefore, the turbine's rotor can be monitored in real time by this method to ensure its stable and secure operation.

Key words: thermal power generation, steam turbine load shedding, rotor's life loss, dynamic model, evaluation method

CLC Number:

TK263.7

WANG Lijian, HE Qing, LI Guoqing. Study on the Simulation of Rotor Life Loss after Unit Load Shedding[J]. Electric Power, 2018, 51(10): 150-155.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201711245

https://www.electricpower.com.cn/EN/Y2018/V51/I10/150

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