摘要
在分别计及和忽略电阻影响的两种情况下,推导了单机系统低频振荡原模型SM1+LM1与简化模型SM2+LM2(忽略电磁暂态模型)及SM3+LM3(忽略电磁暂态及转速变化模型)的复转矩系数。通过对比原模型SM1+LM1与简化模型SM2+LM2及SM3+LM3的复转矩系数,分析了忽略电磁暂态对低频振荡分析的影响。复转矩分析结果显示:电阻为零时,SM1+LM1和SM3+LM3有相同的低频振荡模式阻尼,而SM2+LM2的低频振荡模式具有较低的阻尼;电阻增加时,全阶模型SM1+LM1的低频振荡模式阻尼减小,而简化模型SM2+LM2及SM3+LM3的低频振荡模式阻尼增加。因此,实际工程应用简化低频振荡模型可能获得过于乐观的结果。最后,应用特征值分析方法验证了上述分析结果的正确性。
The complex torque coefficients for the three low-frequency oscillation models of one-machine system including SM1＋LM1（original）,SM2＋LM2（only neglecting electromagnetic transient） and SM3＋LM3（neglecting both electromagnetic transient and angular speed） are deduced with and without the considering of resistance effect in this paper.By comparing complex torque coefficients of SM1＋LM1 with SM2＋LM2 and SM3＋LM3,the effect of neglecting electromagnetic transient on low-frequency oscillation is analyzed.The study results show that,SM1＋LM1 and SM3＋LM3 have the same damping for their low frequency oscillation modes without considering of the resistance effect,while SM2＋LM2 has smaller damping for this case.On the other hand,the damping for the low frequency oscillation modes for SM1＋LM1 decreases with the resistance increasing,but the damping for SM2＋LM2 and SM3＋LM3 increase for this case.Thus,the simplified models can gain the optimized results for the industry applications.In the end,the above observations are validated by eigenvalue method.
出处
《现代电力》
北大核心
2012年第5期22-27,共6页
Modern Electric Power
基金
江苏省科技支撑计划(BE2011143)
江苏大学高级人才启动项目(11JDG027)
国家自然科学基金项目(51007032)
关键词
同步电机模型
电磁暂态
低频振荡
复转矩系数
阻尼
synchronous machine model
electromagnetic transient
low-frequency oscillation
complex torque coefficients
damping
