基于气隙磁场定向的无传感器交流跟踪励磁控制

Sensorless AC tracking excitation control based on air-gap field oriention

为提高电站输出电压的瞬态、稳态性能指标和供电系统的安全及整体性能,采用气隙磁链分析的方法,分析了电压瞬间跌落的成因和大小,结合扩展卡尔曼滤波(EKF)、磁链观测技术和交流跟踪励磁控制技术,对同步发电机非线性状态模型的参数观测、无传感器气隙磁场定位和交流跟踪励磁控制,进行了详细的理论分析。根据具体电站供电系统参数,经过仿真分析和验证,并与传统励磁控制效果比较,发现建压时间缩短至原来的1/2,电压稳定时间缩短至原来的2/3,功角变化迅速,机械冲击小。

To improve the transient and static properties of power station output voltage and the safety and overall performance of power supply system,the air-gap flux analysis is used to analyze the causes and amplitude of voltage drop. Combined with the EKF（Extended Kalman Filters）,flux observation technology and AC tracking excitation technology ,the parameter estimation of synchronous generator nonlinear state model ,the sensorless field-orientation and the AC tracking excitation control are analyzed theoretically. Simulation is carried out according to piratical parameters of power supply system and results show that, compared with the traditional excitation control,the output voltage settling time is half of the original,the voltage stabilizing time is two thirds ,the power angle changes faster and the mechanical shock is smaller.