Effect of Expanded Unit Connection for Units to Low Frequency Oscillation in the Hydropower Plants

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Effect of Expanded Unit Connection for Units to Low Frequency Oscillation in the Hydropower Plants

更新时间：2023-11-28

- Effect of Expanded Unit Connection for Units to Low Frequency Oscillation in the Hydropower Plants
- Advanced Engineering Sciences Vol. 40, Issue 6, Pages: 14-18(2008)
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- Published：2008，
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周建旭,索丽生.水电站机组扩大单元接线对低频振荡的影响[J].工程科学与技术,2008,40(6):14-18.

Effect of Expanded Unit Connection for Units to Low Frequency Oscillation in the Hydropower Plants. [J]. Advanced Engineering Sciences 40(6):14-18(2008)
周建旭,索丽生.水电站机组扩大单元接线对低频振荡的影响[J].工程科学与技术,2008,40(6):14-18. DOI：

Effect of Expanded Unit Connection for Units to Low Frequency Oscillation in the Hydropower Plants. [J]. Advanced Engineering Sciences 40(6):14-18(2008) DOI：

摘要

中文摘要: 研究机组之间存在水力联系的水电站中，两台机组采用扩大单元接线对系统低频振荡阻尼的影响。水力系统采用能准确反映系统各阶振动特性的数学模型，同时基于适用于水轮发电机的五阶综合稳定计算模型和机网接口模型等，建立双机扩大单元接线的数学模型，形成描述水力、机械和电力系统之间联系的整体状态方程组，分析扩大单元接线对系统低频振荡阻尼和稳定性的影响。分析结果表明：对于存在水力联系的两机系统，考虑扩大单元接线的影响，低频振荡阻尼明显增大，单机增加较大的阻尼或两机同时增加较小的阻尼可以达到类似的抑制低频振荡的效果，而水力联系对阻尼分配的影响很小。

Abstract

Abstract:According to two units with hydraulic coupling in hydropower plants

the effect of expanded unit connection to low frequency oscillation’s damping was studied in detail. With the mathematical model of hydraulic system which accurately reflectes each vibration mode of water flow

and the established mathematical model of expanded unit connection deduced from the five order integrative stability model of generator and the interface model between generator and electric power network

the whole state equations to describe the hydraulic、 mechanical and electrical system were derved

furthermore

the effect of expanded unit connection to low frequency oscillation’s damping and stability was analyzed with a given case. The results indicated that

for a system with two units having hydraulic coupling

low frequency oscillation’s damping was increased by the effect of expanded unit connection

and the effect to low frequency oscillation suppression was identical for larger increased damping on one unit and smaller increased damping on two units

while the hydraulic coupling had less effect to the distribution of damping.

关键词

水电站低频振荡扩大单元接线稳定性分析

Keywords

hydropower plantlow frequency oscillationexpanded unit connectionstability analysis

references

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周建旭,张健,刘德有,双机共变顶高尾水洞系统水力干扰计算研究,河海大学学报(自然科学版),2004(6).

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徐晶.陈明有调压室的水电站水力-调速系统的稳定性 [J].

周建旭,水电站水机电系统振动特性和稳定性研究,南京:河海大学,2006.

鞠平,电力系统非线性辨识,南京:河海大学出版社,1999.

Kundur P,Power system stability and control,Beijing:McGraw-Hill Education (Asia) Co;北京:法律出版社,2001.

Lima E E S,Fernandes L F J,Assessing eigenvalue sensitivities,IEEE Transactions on Power Systems,2000(1).

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河海大学水利水电工程学院江苏

Geotechnical & Structural Eng. Research Center,Shandong Univ.,Ji’nan

School of Civil Eng., Shandong Univ., Ji’nan

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