水轮发电机组抑制超低频振荡的阻尼控制参数优化研究  

Research on Optimization of Damping Control Parameters for Suppressing Ultra-low Frequency Oscillation of Hydro-Generator Units

作　　者：周鑫 和鹏 何鑫 ZhouXin;Hepeng;Hexin(Yunnan Electric Power Research Institute,Kunming 650217)

机构地区：[1]云南电网有限责任公司电力科学研究院

出　　处：《云南电力技术》2019年第6期107-113,共7页Yunnan Electric Power

摘　　要：异步联网后云南电网的某直流孤岛中,出现了长时间的超低频振荡现象,严重影响了孤岛系统的安全稳定运行。电网中水轮机的水锤效应时间常数变大,阻尼比会随之减小,导致系统的稳定性恶化。本文利用等值的单机系统模型,基于频域响应法分析了水锤效应与系统稳定性的关系。根据调速系统的阻尼特性,在实际孤岛中进行了PID参数优化仿真试验,比较了不同PID参数下的频率稳定性,给出了调速系统与直流频率控制器的协调控制方法。最后,运用云南电网的某实际直流孤岛作为算例,验证了本文提出的控制方法对抑制超低频振荡的有效性。After asynchronous interconnection,a long-time ultra-low-frequency oscillation occurred in some DC isolated islands in Yunnan Power Grid,which seriously a ected the safe and stable operation of the island system.The time constant of the water hammer e ect of the hydraulic turbine in the power grid becomes larger,the damping ratio will decrease,and the stability of the system will deteriorate.In this paper,the equivalent single-machine system model is utilized to analyze the relationship between the water hammer e ect and the system stability based on the frequency domain response.According to the damping characteristics of the governor system,The PID parameters optimization simulation experiment was performed in the actual island,and the frequency stability was compared under di erent PID parameters.The coordinated control method between the speed control system and the DC frequency controller was given.Finally,an actual DC island in Yunnan Power Grid is used as an example to verify the e ectiveness of the control method proposed in this paper for suppressing ultra-low frequency oscillations is discussed.

关 键 词：超低频振荡 水锤效应 调速系统 阻尼特性 直流频率控制器 

分 类 号：TM712[电气工程—电力系统及自动化]