Direct torque control strategy for brushless doubly-fed machines based on popov hyperstability theory

作者：Yang, Jun-Hua^*; Lü, Hui-Zi; Wu, Jie; Yang, Jin-Ming

来源：Proceedings of the CSEE, 2009, 29(15): 107-113.

• Brushless doubly fed machines
• Direct torque control
• Model reference adaptive
• Popov hyperstability theory
• Speed-sensor less

The operation performance of machine may turn up unstable by the variation of parameters with time in direct torque control (DTC) system of brushless doubly-fed machines (BDFM). A novel speed and flux adaptive observers were designed based on model reference adaptive strategy. The stator currents and stator fluxes of BDFM were used as state variables to observe flux and identify speed at the meantime. The observing value of stator flux was directly applied to DTC algorithm to construct a speed sensorless DTC system of BDFM. The speed adaptive law was defined by Popov hyperstability theory to establish simulation model of DTC under Matlab/Simulink. The simulation results showed that this novel speed and flux adaptive observers can identify stator speed and flux accurately, the flux trajectory could be kept within the scope of tolerance. The influence of stator resistance variation on system performance can be effectively reduced by variation of stator resistance. The stability and robust performance of the system can be enhanced.

• 出版日期2009-5-25
• 单位华南理工大学