直驱风电系统PMSG有无速度传感器控制的比较

Comparison between Encoder and Sensorless Control of PMSG for Direct-driven WECS

为了研究直驱型变速恒频风电系统永磁同步发电机(PMSG)的控制特性,在分析背靠背变流器工作原理的基础上,详细讨论了有无速度传感器控制的工作原理,有传感器控制采用高精度增量式编码器,无传感器控制采用基于锁相环的控制策略对PMSG的转速和相位进行观测。通过仿真和实验验证了高精度增量式编码器及无速度传感器控制在直驱型风电系统中应用的有效性。表明在直驱风电系统(WECS)中无速度传感器控制可以获得良好的控制效果,通过进一步优化能够替代高精度编码器参与控制。

To research control characteristics of permanent magnet synchronous generator（PMSG） for direct-driven variable-speed constant-frequency（VSCF） wind energy conversion system（WECS）, the principle of hack-to-back con- verters was discussed, then the work principles of encoder and sensorless control were analyzed. The high-precision incremental encoder was used for encoder control and the PLL based strategy was adopted for sensorless control to determine the speed and phase of the PMSG. Moreover, the validity of the applications of high-precision incremental encoder and sensorless control in direct-driven WECS was verified by simulation and experiment. Results show that the sensorless control can achieve good performance, may substitute the encoder by further optimization for direct-driven WECS.