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1.清华大学电机工程与应用电子技术系,北京市 100084
2.电力系统及大型发电设备安全控制和仿真国家重点实验室,清华大学,北京市 100084
3.云南电网有限责任公司电力科学研究院,云南省昆明市 650217
4.云南电力调度控制中心,云南省昆明市 650011
李凯斌(1996—),男,硕士研究生,主要研究方向:电力系统有功频率控制过程的稳定性分析。E-mail:likb19@mails.tsinghua.edu.cn
陈磊(1982—),男,通信作者,博士,副研究员,主要研究方向:电力系统动态分析与控制。E-mail:chenlei08@tsinghua.edu.cn
何廷一(1987—),男,硕士,高级工程师,主要研究方向:系统分析机网协调。E-mail:584786940@qq.com
收稿:2021-07-08,
修回:2021-10-20,
网络出版:2021-12-21,
纸质出版:2022-02-25
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李凯斌,陈磊,何廷一等.自动发电控制振荡中元件与控制环节的阻尼特性分析[J].电力系统自动化,2022,46(4):170-179.
LI Kaibin,CHEN Lei,HE Tingyi,et al.Analysis on Damping Characteristics of Elements and Control Links in Oscillation of Automatic Generation Control[J].Automation of Electric Power Systems,2022,46(4):170-179.
李凯斌,陈磊,何廷一等.自动发电控制振荡中元件与控制环节的阻尼特性分析[J].电力系统自动化,2022,46(4):170-179. DOI: 10.7500/AEPS20210708004.
LI Kaibin,CHEN Lei,HE Tingyi,et al.Analysis on Damping Characteristics of Elements and Control Links in Oscillation of Automatic Generation Control[J].Automation of Electric Power Systems,2022,46(4):170-179. DOI: 10.7500/AEPS20210708004.
电力系统中的有功频率控制过程包含一次调频环节和自动发电控制(AGC)环节,频率振荡中与AGC环节强相关的振荡被称为AGC振荡。为研究不同的有功频率控制过程对于AGC振荡的阻尼贡献,将阻尼转矩法应用到AGC振荡分析中,提出AGC振荡中的机械功率阻尼转矩系数的计算方法,在单机单负荷系统中阻尼转矩系数可通过传统的将特征值代入传递函数的方式得到,但传统方法在多区多机系统中不适用。为此,提出了利用模态计算阻尼转矩系数的方法,推导了阻尼转矩系数与AGC模式稳定性的关系。结果表明,阻尼转矩系数为正时,机械功率为系统提供正阻尼,相反则提供负阻尼,且验证了阻尼转矩法在AGC振荡中的适用性。将阻尼转矩系数分解到各有功频率调节过程中,结果显示在AGC振荡中,由于AGC环节的相位滞后较大,而一次调频环节的相位滞后较小,故AGC环节整体上提供的阻尼转矩系数容易为负,而一次调频环节整体上提供的阻尼转矩系数容易为正。但具体到单台机组中,AGC环节和一次调频环节提供的阻尼转矩系数皆既可能为正,也可能为负。最后,利用阻尼转矩法分析了部分参数对于AGC振荡的影响。
Active power and frequency control process in the power system consists of primary frequency regulation and automatic generation control (AGC). In the category of frequency oscillation
the oscillation strongly related to AGC is called AGC oscillation. To study the damping contribution of different kinds of active power and frequency control to AGC oscillation
the damping torque method is applied to the analysis of AGC oscillation. The calculation method for mechanical power damping torque coefficient in AGC oscillation is proposed. In a single-machine single-load system
the damping torque coefficient can be obtained by traditional method of substituting the eigenvalue into the transfer function
which is not applicable in multi-area multi-machine systems. Therefore
a method for calculating the damping torque coefficient using the mode shape is proposed
and the relationship between the damping torque coefficient and the stability of AGC mode is derived. The results show that if the damping torque coefficient is positive
the mechanical power will provide positive damping for the power system
conversely
the mechanical power will provide negative damping. The applicability of the damping torque method in AGC oscillation is verified. The damping torque coefficient is decomposed into each active power and frequency regulation process. The results show that in AGC oscillation
because the phase lag of AGC is too large while that of primary frequency regulation is small
the damping torque coefficient provided by AGC tends to be negative on the whole while that provided by primary frequency regulation tends to be positive on the whole. However
for each single unit specifically
the damping torque coefficient provided by AGC and primary frequency regulation may be either positive or negative. Finally
the influence of some parameters on AGC oscillation is analyzed based on the damping torque method.
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