SPWM-based (sinusoidal pulse width modulation) fault-tolerance control method of three-phase open-winding PMSM (permanent magnet synchronous motor) drive system

Abstract

The invention discloses an SPWM-based (sinusoidal pulse width modulation) fault-tolerance control method of a three-phase open-winding PMSM (permanent magnet synchronous motor) drive system. After switch tubes on one leg of double inverters of a double-inverter drive system experience a single-switch open-circuit fault or a short circuit fault, control signals of symmetric normal switch tubes are set to 1 or 0 so as to reconstruct a single-switch fault topological structure; according to a post-fault reconstructed mathematical model of the double-inverter drive system, zero-sequence reference voltage of the double inverters faulted is calculated; finally, according to the calculated zero-sequence reference voltage, switching from normal operation to post-fault fault-tolerant operation is achieved on basis of an SPWM algorithm. The method has the advantages that the problem that effective voltage vector drop occurs after a single-switch fault occurs to the traditional single inverter is solved, the single-switch fault tolerance algorithm of the double inverters is greatly simplified, complexity of the drive system is reduced, post-fault fault-tolerant operation is effectively achieved, and system reliability is improved.

Description

technical field [0001] The invention relates to a fault-tolerant control after a single switching tube of a three-phase open-winding PMSM (permanent magnet synchronous motor) double inverter drive system fails (open circuit fault, short circuit fault), and belongs to the permanent magnet synchronous motor control technology. Background technique [0002] Compared with other three-level topologies (NPC inverter, leap capacitor inverter topology), the dual-inverter topology reduces the number of switching devices, and at the same time due to its own Compared with the traditional single-inverter structure, the redundancy of switching devices is greatly improved, and the reliability of the drive system is greatly improved. Due to its own characteristics, the dual-inverter topology is very suitable for high-power drive systems such as electric vehicles and aerospace. Therefore, the research on fault-tolerant control of dual inverters can greatly improve the reliable operation of...

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Problems solved by technology

However, this method needs to readjust the space vector modulation method, which greatly increases the complexity of the fault-tolerant control algorithm and greatly reduces the algorithm compatibility of the overall drive system.

[0004] Therefore, in the prior art, for the three-phase open-winding PMSM drive system, the fault tolerance of self-reconfiguration can be performed after the single-switch open-circuit fault occurs, and the problem of the effective output voltage reduction of the single inverter can also be solved. However, the existing The method is based on the SVPWM modulation method, which will make the space vector modulation part of the fault-tolerant program need to be re-modulated, and the switching program after a fault is complicated, which will make the overall drive system control algorithm more complicated; at the same time, the existing method is also for single switch There is no good explanation for the short-circuit fault tolerance of a single switch tube.

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