针对某电厂#1燃气机组发生的低频功率振荡事件,分析振荡产生的原因。研究单轴带同步离合器燃气机组停机过程中轴系转动惯量发生变化的情况,论证机组电力系统稳定器(power system stabilizer,PSS)模型参数选择的合理性,以及PSS造成加剧...针对某电厂#1燃气机组发生的低频功率振荡事件,分析振荡产生的原因。研究单轴带同步离合器燃气机组停机过程中轴系转动惯量发生变化的情况,论证机组电力系统稳定器(power system stabilizer,PSS)模型参数选择的合理性,以及PSS造成加剧振荡的原因和过程。在上述分析的基础上,提出防止故障再次发生的方案。进行机组PSS优化试验修改定值,并通过模拟之前的故障状态,验证修改定值后的PSS对发电机低频振荡取得良好的抑制效果,同时避免转动惯量发生变化加剧振荡的情况。问题的解决也充分说明PSS现场参数整定的重要性,为解决同类型机组可能发生的功率振荡隐患提供参考。展开更多
An effective and flexible rotation and compensation scheme is designed to improve the accuracy of rotating inertial navigation system （RINS）. The accuracy of single-axial R1NS is limited by the errors on the rotatin...An effective and flexible rotation and compensation scheme is designed to improve the accuracy of rotating inertial navigation system （RINS）. The accuracy of single-axial R1NS is limited by the errors on the rotating axis. A novel inertial measurement unit （IMU） scheme with error compensation for the rotating axis of fiber optic gyros （FOG） RINS is presented. In the scheme, two couples of inertial sensors with similar error characteristics are mounted oppositely on the rotating axes to compensate the sensors error. Without any change for the rotation cycle, this scheme improves the system＇s precision and reliability, and also offers the redundancy for the system. The results of 36 h navigation simulation prove that the accuracy of the system is improved notably compared with normal strapdown INS, besides the heading accuracy is increased by 3 times compared with single-axial RINS, and the position accuracy is improved by 1 order of magnitude.展开更多
文摘针对某电厂#1燃气机组发生的低频功率振荡事件,分析振荡产生的原因。研究单轴带同步离合器燃气机组停机过程中轴系转动惯量发生变化的情况,论证机组电力系统稳定器(power system stabilizer,PSS)模型参数选择的合理性,以及PSS造成加剧振荡的原因和过程。在上述分析的基础上,提出防止故障再次发生的方案。进行机组PSS优化试验修改定值,并通过模拟之前的故障状态,验证修改定值后的PSS对发电机低频振荡取得良好的抑制效果,同时避免转动惯量发生变化加剧振荡的情况。问题的解决也充分说明PSS现场参数整定的重要性,为解决同类型机组可能发生的功率振荡隐患提供参考。
基金supported by the National Natural Science Foundation of China (No.40904018)the Key Laboratory Foundation of the Ministry of Education of China (No.201001)the Doctoral Innovation Foundation of Naval University of Engineering (No.BSJJ2011008)
文摘An effective and flexible rotation and compensation scheme is designed to improve the accuracy of rotating inertial navigation system （RINS）. The accuracy of single-axial R1NS is limited by the errors on the rotating axis. A novel inertial measurement unit （IMU） scheme with error compensation for the rotating axis of fiber optic gyros （FOG） RINS is presented. In the scheme, two couples of inertial sensors with similar error characteristics are mounted oppositely on the rotating axes to compensate the sensors error. Without any change for the rotation cycle, this scheme improves the system＇s precision and reliability, and also offers the redundancy for the system. The results of 36 h navigation simulation prove that the accuracy of the system is improved notably compared with normal strapdown INS, besides the heading accuracy is increased by 3 times compared with single-axial RINS, and the position accuracy is improved by 1 order of magnitude.
