Active Disturbance Rejection Control Research For The Permanent Magnet Starter-generator

As a class of newly developed aerodynamic equipment,the permanent magnet starter-generator(PMSG)is widely applied to the starter/generator system of the aero engine.Due to the complexity of the working environment and the diversity of perturbations,disturbance rejection controllers design serves as the basic protection for the normal work of the PMSG.The active disturbance rejection controller(ADRC)is in possession of the ability to actively reject perturbations,which yield much application in practice.Aiming at the PMSG system,this thesis investigates the application and improvement on the ADRC.It mainly includes the following contents.The working principle of the PMSG is stated from the perspective of the magnetomotive force.With the method of space coordinate transformation,the PMSG system is modeled in the d-q coordinates.The active control approach,hardware drive principle and PWM signal modulation mechanism is introduced.Based on the mathematical model,the cascade multiple-loop-control system scheme is provided.The 5.5-k W PMSG experimental platform is designed.The components of the experimental platform and the functions of each part are analyzed.The designing scheme of the hardware drive based on the IGBT module,and the control programming process based on the TMS320F28335DSP is given.Meanwhile,the data acquisition software is developed based on the Labview programming and RS-485 communication.Aiming at the PMSG system in the starting condition,an improved q-axis current ADRC is designed.By means of the known model information and combining with the recursive least-squares method,a part of the disturbance in the q-axis current loop is modeled and compensated,which effectively reduces the workload of the extended state observer(ESO).The BIBO stability of the observed error system is analyzed.Finally,the effectiveness of the proposed method is verified by numerical simulation results.Aiming at the speed loop and the DC-link voltage loop,a class of linear switching ADR-C(LSADRC)is designed.By analyzing the influence of the observer gains’change on the controller and the closed-loop system,the system-state-dependent switching rules are designed.The stability and H_∞performance conditions are analyzed for the switched error system.The superiorities of the proposed method are verified in the experimental platform.