Research On Drive Control Technology Of Permanent Magnet Synchronous /Doubly Salient Electro-magnet Parallel Hybrid Excitation Machine

Combining PMSM with stator excitation variable reluctance machine, permanent magnet synchronous /doubly salient electro-magnet parallel hybrid synchronous machine having the advantages of high efficiency, high power density, adjustable air-gap magnetic field and brushless excitation has a significant application prospect in the fields of aircraft starter/generator system and electric vehicles. And drive control technology of PMSM/DSEM PHEM is investigated in this paper.The structure principle and mathmatical model of PHEM is illustrated firstly, whose electromagnetic characteristics such as magnetic field, back electromotive force, and inductance are analyzed in detail. And the simulation analysis focusing on the armature reaction and operation modes of the PMSM part and DSEM part is done respectively. Then five kinds of new parallel hybrid excitation topologies are proposed, and the PMSM/VFRM topology is analyzed in brief.The electromagnetic torque and torque ripple of PHEM operating in BLAC and BLDC under the condition of equal copper loss are compared, respectively. Furthermore the torque-current and torqueangle characteristics of PHEM are analyzed. And BLAC operation is slightly better than BLDC operation, and the field current has few effects on torque-angle characteristics. What's more, two control methods, namely vector control and expected voltage based direct torque control are discussed in BLAC Operation range is divided into four parts: simplified MTPA control—constant torque operation, field weakening control by positive field current—constant power operation, field weakening control by negative field current—motoring/generating operation and field weakening control by armature current—motoring/generating generation. The field-circuit coupled co-simulation model of control system is built based on Maxwell-Simplorer-Simulink, where vector control, expected voltage direct torque control and PWM current chopping control are analyzed and verified.The drive system of PMSM/DSEM PHEM is implemented, including 270 kW ATRU and 250 kW motor controller. The hardware and software are completed respectively, and the whole drive system is jointly debugged. Furthermore, the test bed of PHEM is set up, in which, ATRU and vector control of PHEM is tested. THD of grid side current is lesser than 7% and the efficiency of rectifier system is 97%. Finally, PHEM motoring experiments show that the PMSM/DSEM PHEM can be controlled effectively employing vector control. And air-gap magnetic field is regulated by field current, field weakening speed expansion by field current is achieved also.