水轮机组与电网耦合对电网动态稳定的影响

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Abstract Low frequency ocillation phenomenon in which the hydraulic turbine sets participate occurred on power system many times. They have unknown mechanism, which has seriously affected the security and stability operation of power grid. In this paper, taking the Zhelin hydropower plant of Jiangxi Power Grid as the example, the states of water tail pressure pulsation and the influences for the output mechanical power are analyzed firstly. Then the hydraulic turbine set model considering the water tail pressure dynamic is established based on the physical characteristics of the draft tube hydraulic system. The effect of water tail pressure pulsation on the power grid dynamic security and stability is studied and the coupling between the hydraulic turbine set and power grid was investigated. The simulation results indicate that power oscillation in power grid might be caused by the water tail pressure pulsation because of resonance, when the water pressure pulse frequency is consistent with or close to power system natural oscillation frequency. Power oscillation causes the dynamic instability of power grid. The conclusion can provide reference to research into the causes of power system low frequency oscillations.

Key words： Power grid hydraulic turbine set draft tube pressure pulsation low frequency oscillation

Received: 08 July 2008 Published: 17 February 2014

PACS:

TM712

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	Han Zhiyong
	Xu Yanhui
	Xin Jianbo
	He Renmu
	Bo Bo

Cite this article:

Han Zhiyong,Xu Yanhui,Xin Jianbo等. Effect of the Coupling Between Hydraulic Turbine Set and Power Grid on Power Grid Dynamic Stability[J]. Transactions of China Electrotechnical Society, 2009, 24(9): 166-170.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2009/V24/I9/166

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