Research on speed sensor-less vector control strategy of cascaded high-voltage inverter system
LIU Jianqiang
LI Guanghe
HUANG Xiaoguang
Abstract：To improve the reliability and robustness of high-voltage inverter system,a speed sensor-less vector control strategy for the cascade-type high voltage inverter system is proposed.Flux observation model,speed identification method and PWM pulses dead time compensation method are intensively optimized in the strategy.Voltage model in the flux observation is improved,MRAS speed identification method based on rotor flux linkage angle is used and dead time of PWM pulses is compensated.As a result,the system performance at low speed and control precision are enhanced.A simulation model in Matlab/Simulink platform is set up.The effectiveness of the proposed control strategy is demonstrated by the simulation results.High-power experimental platform is designed and built.The experiment results further verifies the correctness of the simulation results,proving that the strategy has a good speed identification precision and speed regulating performance.Dead time compensation can reduce the speed fluctuation and improve the speed identification accuracy in the low-speed area.
Keywords：cascaded high-voltage inverter systemspeed sensor-lessvector controlspeed identificationdead time compensation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 85-92 )