Research On Control System Of Five Phase Fault-Tolerant Permanent-magnet Vernier Machine

Advances in power electronics technology have promoted innovation of fault-tolerant permanent magnet motor control system. Continuity and reliability become the most important performance indicators of the control system. Fault-tolerant multiphase permanent magnet machine with fault-tolerant performance itself has received widespread attention. Progress of machine and drive control system has also increased requirements for control algorithm. This paper proposes a new fault tolerant control algorithm of five-phase fault-tolerant permanent-magnet vernier(FT-PMV) machine and verify the correctness of the algorithm based on simulations and experiments. FT-PMV machine comprises features of high efficiency of permanent magnet machine, high torque of vernier machine and high reliability of fault-tolerant machine. When open-circuit failure occurs, normal phases have been used to compensate torque of the open-circuit fault phase based on different constraints. When short-circuit failure occurs, remedial currents of healthy phases are used to compensate the ripple caused by the short-circuit current and the algorithm is used to compensate the lack of the normal torque of fault phase. The main contents of this paper are as follows:1. By analyzing the FT-PMV machine structure and working principle, electromagnetic machine performance can be studied based on the use of finite element analysis software Maxwell. Respectively, FT-PMV machine mathematical model is established in five-phase natural coordinate system and the rotating coordinate system. It is conducive to the simulation analysis later.2. Fault-tolerant control algorithm is derived after analyzing fault type of FT-PMV machine. When open-circuit failure occurs in one or more phases, the lack of torque can be compensated by other normal phases and magnetic motive force(MMF) can be kept unchanged. Torque of the machine can be kept stable and the system operates normally. When short circuit failure occurs in one phase, the proposed remedial control algorithm contains two parts. Firstly, remedial currents of healthy phases are used to compensate the ripple of MMF caused by the short-circuit current. Secondly, an open-circuit fault-tolerant control algorithm is used to compensate the lack of the normal torque of fault phase.3. Matlab and Maxwell/Simplorer co-simulation are used to analyze the machine in normal and fault-tolerant operation. Reliability of proposed fault-tolerant control algorithm is verified based on comparison of the simulation results and theoretical analysis.4. Construction of hardware and software platform guarantees the realization of motor control drive platform and improves the availability, reliability of system. Experimental platform is established to verify correctness and rationality of the control algorithm.