永磁直驱风电变流器无传感器控制研究

Research on Sensorless Control for PMSG of Direct-drive Wind Power Converter

永磁直驱风力发电系统是一种新型的风力发电系统,具有广泛的应用前景。背靠背的全功率变流器是直驱型风力发电系统中的关键设备,既要实现对电网转换优质电能的功能,又要对永磁同步发电机(PMSG)进行控制。永磁同步发电机的无传感器控制技术具有重要的研究意义。根据永磁同步发电机的数学模型,利用其电磁、电气关系,提出了一种基于转子磁链闭环锁相环的永磁同步发电机位置的估算算法。通过仿真和实验结果表明,利用该估算方法能够准确计算出永磁同步发电机的位置,并可以利用其对永磁同步发电机实现有效的控制。

Permanent magnet direct drive type wind power generation system is a new type of wind power generation system, has a broad prospect of application. Backtoback full power converter is the key equipment of direct drive type wind power generation system, it realizes the function to convert high quality electrical energy to the grid and to control the permanent magnet synchronous generator （PMSG）.The sensorless control technology of PMSG has important research significance. Based on the mathematical model and the electromagnetic, electrical principle of PMSG, an estimation algorithm of the position based on rotor flux closedloop PLL was presented. The results of simulation and experiment prove that the estimation method can accurately calculate the position and make effective control of permanent magnet synchronous generator.