电力系统一次调频过程的超低频振荡分析

LU Xiaomin

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电力系统一次调频过程的超低频振荡分析

更新时间：2025-08-13

- 电力系统一次调频过程的超低频振荡分析
- Automation of Electric Power Systems Vol. 41, Issue 16, Pages: 64-70(2017)
- 作者机构：
  
  清华大学电机工程与应用电子技术系,北京市,100084
- 作者简介：
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- Published：2017
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LU Xiaomin. [J]. Automation of electric power systems, 2017, 41(16): 64-70.
DOI：

LU Xiaomin. [J]. Automation of electric power systems, 2017, 41(16): 64-70. DOI：

摘要

实际系统中多次发生一次调频过程不稳定导致的超低频频率振荡事件

在机理和表现上与传统的低频振荡存在显著区别。超低频频率振荡属于频率稳定的范畴

单机单负荷系统是研究该问题的最简系统。基于单机单负荷系统研究了超低频频率振荡的振荡频率、阻尼、振荡表现等关键特征。解析推导了简化模型下的振荡频率和阻尼并分析其影响因素。引入伯德图方法分析详细模型下的振荡频率和阻尼

幅值交接频率、相角裕度分别与振荡频率、阻尼比对应。证明了阻尼转矩法在分析原动系统阻尼特性时的适用性。采用相量图方法说明超低频频率振荡中机械功率的振荡幅度大于电磁功率。

Abstract

In the actual system

the ultra-low-frequency frequency oscillation(ULFFO)event caused by instability of the primary frequency regulation process is different from the traditional low-frequency oscillation in both mechanism and performance. ULFFO belongs in the category of frequency stability. The single-machine single-load system is the simplest system to study this problem. Such key characteristics of ULFFO as oscillation frequency

damping and oscillation performance are tackled based on the single-machine single-load system. The oscillation frequency and damping as well as their influencing factors are derived and analyzed in the simplified model. The Bode plot method

whose crossover frequency and phase margin corresponds to the oscillation frequency and damping ratio respectively

is used to investigate the oscillation frequency and damping in the detailed model. The applicability of the damping torque method in treating the damping of the prime mover system is confirmed. The amplitude of mechanical power is larger than that of electromagnetic power in ULFFO. This work is supported by National Natural Science Foundation of China(No. 51377002)and China Southern Power Grid Company Limited.

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