Improved Steam Turbine Power and Load Unbalance Protection and Parameter Setting

doi:10.11930/j.issn.1004-9649.2017.08.125.04

Electric Power ›› 2017, Vol. 50 ›› Issue (8): 125-128.DOI: 10.11930/j.issn.1004-9649.2017.08.125.04

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Improved Steam Turbine Power and Load Unbalance Protection and Parameter Setting

AI Dongping¹, LI Yingkai², YANG Xi², WANG Zhonghua³, TAO Xiangyu¹, CHEN Tao², WANG Liangyi²

1. China Electric Power Research Institute, Beijing100192, China;
2. State Grid Chongqing Electric Power Company, Chongqing 400015, China;
3. Chongqing Shendong Electric Power Wanzhou Power Plant Company, Chongqing 404000, China

Received:2016-09-12 Online:2017-08-25 Published:2017-08-25
Supported by:
This work is supported by the Science and Technology Project of SGCC (No.XT71-15-052)

Abstract

Abstract: An analysis of the malfunction of PLU protection of steam turbines in China shows that the PLU protection based on the mechanical power and the electric power imbalance has malfunction risks caused by grid faults. In order to solve this problem, a simulation model for stability analysis is established by introducing the speed constraint into the PLU protection, and the principles for setting the rotating speed constraints are proposed. Based on the regional power grids, the typical faults are used to configure the speed constraint parameter. The simulation result verifies that this method can effectively prevent the PLU malfunction and improve the reliability of PLU protection.

Key words: steam turbine, grid-related protection, power and load unbalance (PLU), modeling, simulation

CLC Number:

TM311

AI Dongping, LI Yingkai, YANG Xi, WANG Zhonghua, TAO Xiangyu, CHEN Tao, WANG Liangyi. Improved Steam Turbine Power and Load Unbalance Protection and Parameter Setting[J]. Electric Power, 2017, 50(8): 125-128.

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https://www.electricpower.com.cn/EN/Y2017/V50/I8/125

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Improved Steam Turbine Power and Load Unbalance Protection and Parameter Setting

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