Speed Sensorless Starting Control Of A Dual Stator-winding Induction Generator

Variable Frequency(VF)AC power system has been the main power system for the civil aircraft with the advantages of high power supply quality,high reliability,small volume and low weight.In order to further reduce the weight of the aircraft and to enhance the reliability of the power system,the integrated starter/generator and the speed sensorless control have been the key technologies of VF AC power system.This paper researches the speed sensorless control of dual stator-winding induction generator(DWIG)working as the integrated starter/generator in the variable frequency ac(VFAC)aircraft power system.The systematic block diagram of DWIG and its mathematical models are described firstly.In order to accelerate the starting process with less time,this paper proposes the starting rotor field oriented vector control strategy of DWIG based on the theoretical analysis and equational results of its starting characteristics.The simulation model of the DWIG starting system is constructed in MATLAB/SIMULINK to verify the performance of the starting control strategy.The speed sensor is easy influenced by the working conditions,such as the temperature and the humidity.Therefore,to enhance the reliability of the power system and to reduce the weight of the aircraft,it is necessary to study the speed sensorless vector control of DWIG starting system.This paper chooses the extended Kalman filter(EKF)to realize the speed estimation and the rotor flux observation considering the low speed in the starting situation.The paper firstly introduces the principle of the EKF in detail and proposes a novel reduced-order EKF according to the characteristics of DWIG after analyzing the shortcomes of the common reduced-order EKF.The result of simulation prove that the novel reduced-order extended Kalman filter proposed in this paper can real-time estimate rotor speed and rotor flux very accurately,and based on which the speed sensorless drive system has good static and dynamic performance.Moreover,a digital experimental test-bed on DSP28335 and CPLD for the 15 kW DWIG VFAC power system is built to verify the theory and simulation analysis.The hardware composing of the sensorless DWIG starting system and software flowchart are introduced in detail.The experiments are conducted to prove the performances of the starting vector control strategy of DWIG and the novel reduced-order extended Kalman filter proposed in this paper.The experimental results show that both the control strategy and the observational method have good static and dynamic performance.