水火电机组调速器死区对超低频振荡的影响分析

Analysis of Governor Deadband Influence of Hydro-thermal Generation Unit on Ultra-low Frequency Oscillation

超低频振荡是近年来西南电网容易出现的频率稳定问题。现在的研究发现调速器系统是引起超低频的关键因素,通过优化调速器参数是抑制超低频振荡的有效手段。除此以外,调速器的死区作为非线性环节,对超低频振荡的影响很大,利用调速器死区实现抑制超低频振荡成为一种可能。基于此利用频率响应模型,分析水、火电机组的调速器死区对超低频振荡的影响,对如何利用死区配置在不损失调频能力的情况下实现超低频振荡抑制给出合理的建议。

Ultra-low frequency oscillation(ULFO)has been the most common problem of frequency stability in Southwest Power Grid in recent years.The existing researches point out that the governor system is the key factor to cause the UFLO.The optimization of governor parameters is an effective way to suppress the ULFO.Besides,the nonlinearity of governor deadband has a great influence on ULFO,and the appropriate setting of governor deadband contributes to the suppression of ULFO.The frequency response system is adopted to analyze the governor deadband of hydro-thermal generation unit,and its influence on ULFO is presented.Adjusting the deadband setting is suggested for purpose of suppressing ULFO while maintaining the system ability of frequency regulation.