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汽轮机调速系统参数对电力系统阻尼特性的影响
王官宏, 黄 兴
中国电力科学研究院,北京 100192
摘要:
建立了电力系统稳定计算用汽轮机及调速系统的数学模型并对其进行了适当的简化。频域分析和时域仿真表明,不同参数配置下的汽轮机调速系统对电力系统的影响不一样,它可能增加系统的阻尼,也可能减小系统阻尼。放大倍数不改变系统的分界频率,但阻尼大小、时间常数和纯延时等非线性环节是影响分界频率的主要因素。汽轮机调速系统对电力系统阻尼特性的影响可以通过其提供的附加阻尼系数的符号和大小来确定。分界频率是判断调速系统阻尼特性的重要依据,当振荡频率在分界频率附近时,附加阻尼系数很小,此时调速系统提供的附加阻尼接近于0,对系统的影响可忽略;当振荡频率远离分界频率时,需要考虑调速系统对电力系统阻尼的影响。对3机9节点系统进行小干扰分析和时域仿真,结果验证了理论分析的正确性。
关键词:  汽轮机调速系统  分界频率  阻尼特性  电力系统
DOI:
分类号:
基金项目:
Influence of turbine governor parameters on power system damping
WANG Guanhong, HUANG Xing
China Electric Power Research Institute,Beijing 100192,China
Abstract:
The mathematical models of turbine governor are established and simplified for the stability calculation of power system. The frequency domain analysis and time domain simulation indicate that different parameter configurations of turbine governor have different influences on power system,increasing or decreasing its damping. The magnification change has no influence on boundary frequency while the nonlinearity of damping,time constant and pure time delay are its main influencing factors. The impact of turbine governor on the damping characteristic of power system can be determined by the sign and magnitude of the added damping coefficient. The boundary frequency is the main criterion to evaluate the damping characteristic of governor. When the oscillation frequency is close to the boundary frequency,the added damping coefficient is nearly 0 and the impact of turbine governor on system can be ignored,otherwise,it should be considered. The results of slight disturbance analysis and time-domain simulation for three-machine nine-bus system verify the correctness of theoretical analysis.
Key words:  turbine governor  boundary frequency  damping characteristic  power system

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