基于滑模观测器的直驱PMSG机侧控制算法研究与应用

Research and Application of Generator-Side Control Algorithm for Direct-Drive PMSG Based on Sliding Mode Observer

为适应平流水发电水流变化、转速不稳定等外部环境的变化,提高发电站的发电效率,在直驱式永磁同步发电机(PMSG)机侧控制算法的基础上,设计一种带反馈增益自调整算法的滑模观测器(SMO),对PMSG的转子位置进行估算,从而改善低速的估计误差。通过设计一套37 kW的PMSG发电机组,并在现场进行了试验测试,验证了算法可以有效控制直驱PMSG在低速运行时的转子位置估算误差,在高速运行时算法能够快速收敛,满足PMSG控制要求。

For small hydropower stations using direct-drive permanent magnet synchronous generators(PMSGs),there exist the needs of adapting to the changes of the external environment such as the change of flow water and the unstable speed of rotation,and improving the efficiency of the power generation.Based on the control algorithm of the direct-drive PMSG on the generator side,a sliding mode observer(SMO)with feedback automatic gain control algorithm is designed to estimate the rotor position of PMSG,so as to improve the estimation error at low speed.We design a set of 37 kW PMSG generator and carry out experiment tests.The results verify that the algorithm can effectively control the rotor position estimation error of the direct-drive PMSG at low speed,and quickly converge at high speed,meeting the control requirements of PMSG.