Case Study on Load Rejection Caused by Configuration Problems of Primary Frequency Regulation

doi:10.11930/j.issn.1004-9649.2017.02.070.05

Abstract

Abstract: To analyze the load rejection accident happened in a 650-MW thermal generation unit, an accurate boiler-turbine model of the unit is built in the Digital Electronic Hydraulic (DEH, for short) system. By using the simulation function of DEH, the course of the accident is reproduced to find out the causes. The result indicates that the immediate cause of the load rejection during the control mode switchover lies in the irrational primary frequency regulation configuration, of which the superimposed effects make the valve position demand to be changed abnormally by a great margin. Furthermore, the influences of the related parameters on the load rejection are studied with real- time simulation. It is indicated that the DEH processing cycle, the turbine speed and the load condition are all related to the load rejection. At the end, the suggestions of normalizing the design and taking more simulative tests to verify the design rationality of primary frequency regulation are put forward.

Key words: thermal generation unit, load rejection, digital electronic hydraulic system, model, real-time simulation, primary frequency regulation

CLC Number:

TM621

SHENG Kai, CHEN Yanfeng, ZHOU Nianguang. Case Study on Load Rejection Caused by Configuration Problems of Primary Frequency Regulation[J]. Electric Power, 2017, 50(2): 70-74.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.02.070.05

https://www.electricpower.com.cn/EN/Y2017/V50/I2/70

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