ANALYSIS OF ABNORMAL POWER FLUCTUATION RESULTED FROM LOW EXCITION LIMIT IN EXCITATION OF 300MW UNIT

WANG Qing-ming Bashu Jiangyou Power Plant

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ANALYSIS OF ABNORMAL POWER FLUCTUATION RESULTED FROM LOW EXCITION LIMIT IN EXCITATION OF 300MW UNIT

更新时间：2025-09-28

- ANALYSIS OF ABNORMAL POWER FLUCTUATION RESULTED FROM LOW EXCITION LIMIT IN EXCITATION OF 300MW UNIT
- Thermal Power Generation Vol. 38, Issue 12, Pages: 75-77(2009)
- 作者机构：
  
  巴蜀江油发电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2009
- 稿件说明：
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WANG Qing-ming Bashu Jiangyou Power Plant. ANALYSIS OF ABNORMAL POWER FLUCTUATION RESULTED FROM LOW EXCITION LIMIT IN EXCITATION OF 300MW UNIT[J]. Thermal power generation, 2009, 38(12): 75-77.
DOI：

WANG Qing-ming Bashu Jiangyou Power Plant. ANALYSIS OF ABNORMAL POWER FLUCTUATION RESULTED FROM LOW EXCITION LIMIT IN EXCITATION OF 300MW UNIT[J]. Thermal power generation, 2009, 38(12): 75-77. DOI：

摘要

巴蜀江油发电厂二期2×300MW机组的2号机组在168h试运行过程中发生功率振荡

引发四川500kV电网较大范围内功率、电压异常波动。经分析导致电网功率、电压异常波动的原因为:(1)机组在起动滑参数运行阶段

负荷目标值设定过高;(2)原低励限制线的斜率过大;(3)波动发生后

无功负荷未及时增加

而机组有功负荷仍继续增加。对此

将低励限制曲线修改后

机组运行稳定。

Abstract

In debugging process of 168 h trial operation for unit no.2 in second-phase project of Bashu Jiangyou Power Plant(2×300 MW units)

power oscillation had appeared

resulting in abnormal fluctuation of power and voltage in a large region of 500 kV power grid in Sichuan Province.Through analysis

it is believed that the causes leading to above-mentioned abnormal fluctuation of power and voltage are as follows:(1)in the stage of sliding parameter operation for starting up the unit

the valve-position control mode was used

and the governing valve being put into the "whole open"position

the target value of load being too high;(2)the slope of original low excitation limit curve was too large;(3)after occurrence of fluctuation

the reactive load hadn't timely increased

on the contrary

the active load of the unit was still increasing.Regarding to this

the curve of low excitation limit has been modified

and now the unit can keep in stable operation.

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