Simulation On Fault Tolerant Topologies For PMSM Based On Three-phase Four-legged Power Converter

The Permanent Magnet Synchronous motor is a representative of Permanent Magnet motor, which has some characteristics, such as small, power density, high efficiency and power factor higher distinct. Because of these superior performances and with the development of the national economy, its application is constantly expanded.But in some strict occasions, if the failures of PMSM appear, the disastrous influence on security and stability of the system will occur, so fault tolerance become a vital requirement. Therefore stable performance of the PMSM topological structure in fault tolerance is required.The topic of this paper is based on this kind of important realistic significance. First, by the analysis of the results of domestic and international researches, the appropriate control method and the fault detection means are selected. Then in the light of the fault-tolerant structure on the appropriate improvement, this paper gives the topological structure of three phases four bridges fault tolerance. Secondly, the existing model of PMSM is transformed to the suitable model of PMSM. Finally, using the Simulink of MATLAB, the fault-tolerant theory and the model of PMSM are tested. The open loop control of fault-tolerant control system is simulated, and the improved, system is carried, which is a double loop fault-tolerant control system with torque compensation devices. And the results of simulation illustrate that the topological structure of three phases four bridges fault tolerance has a very good feasibility, and shows good performance. After completing the above work, the hardware-in-the-loop simulation of the topological structure of three phases four bridges fault tolerance is realized by using DSP and Simulink and the feasibility of topological structure is verified.