Research On Current Control Strategy Of Hybrid Excitation Synchronous Machine With Magnetic Shunt Rotor

Hybrid excitation synchronous machine (HESM) with the magnetic shunt rotor is a novel HESMderiving from circumferentially-magnetized permanent magnet synchronous machine (PMSM), whichsimultaneously inherits the distinct merits of high air-gap flux density and offers brushless flexibleair-gap flux control. Therefore, HESM is of significantly progressive potentiality invariable-frequency adjustable-speed domain, and the research on current control technique is the keyfoundation for the achievement of the HESM drive system.The dissertation constructs the mathematical model of HESM in the stator/rotor coordinate basedon the structural features and operating principle of HESM. Then the drive system and current controltechnique are investigated, and a region-separated optimal control regime is proposed on the basis ofconventional vector control, namely in the low-speed region, the efficiency-optimized control isadopted in order to enhance the operating efficiency; whilst the two flux-weakening control methodsare employed, viz., field current and d-axis current control, where the former utilizes amaximum-torque-control method to guarantee the dynamic responsive performance. Furthermore, theMatlab/Simulink tool-kit is involved to simulate the fundamental characteristics and current controlmethod, verifying the correctness of simulation model and control strategy.The test platform and software system of132kW HESM drive are experimentally researched.The inductance parameters are measured by the experimental verification, in which the variation lawof inductance parameters is obtained. The operating stability and transient performance of HESM atdifferent working status are augmented by implementing the current control regime in thespeed-adjustable drive experiment, hence the overall operating efficiency is maximum upgraded， theefficiency of most operation region exceed80%. Finally, it can be validated that the HESM possessesbroad variable-speed operation during the flux-weakening coordinated control of field current andd-axis current.