电力系统共振机理低频振荡扰动源分析  

The Cause Analysis of Turbine Power Disturbance Inducing Power System Low Frequency Oscillation of Resonance Mechanism

作　　者：徐衍会[1] 贺仁睦[1] 韩志勇[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2007年第17期83-87,共5页Proceedings of the CSEE

基　　金：国家重点基础研究专项经费项目(2004CB217901);教育部长江学者和创新团队项目(IRT0515);华北电力大学校内重大项目预研基金项目(2004);华北电力大学校内青年基金项目(2004-2)。~~

摘　　要：共振机理是解释电力系统发生低频振荡的理论之一。文中根据汽轮机功率扰动引起电力系统低频振荡的共振机理,研究了汽轮机功率变化的原因。应用MATLAB建立了火力发电厂动力系统和电力系统相互作用的机网耦合模型。详细分析了锅炉燃烧率扰动和汽轮机调节汽门扰动能否引起汽轮机功率变化。仿真分析表明,调节汽门扰动频率与电力系统自然振荡频率一致或接近时,均可能引起电力系统发生共振机理的低频振荡。由于锅炉具有很大的惯性,锅炉燃烧率扰动很难引起电力系统发生共振机理的低频振荡。Resonance mechanism is one of the theories that interpret power system low frequency oscillation. According to the resonance mechanism, power disturbance of prime mover can arouse power system forced low frequency oscillations. Therefore, the causes of turbine power disturbance were analyzed. The coupling model between thermodynamic system of plant and power system was set up by MATLAB. The possibility of combustion ratio of boiler and control valve of governing system disturbance inducing the variation of turbine power was researched in detail. The simulation results indicate that power system low frequency oscillations of resonance mechanism might be caused by the disturbance of control valve, when it＇s frequency is consistent with or close to power system natural oscillations frequency. Because of the biggish inertia of boiler, the disturbance of combustion ratio cannot invoke power system low frequency oscillation of resonance mechanism.

关 键 词：电力系统 低频振荡 燃烧率 调节汽门 共振机理 

分 类 号：TM712[电气工程—电力系统及自动化]