Satisfaction optimization prediction fault-tolerant control method for double-three-level inverter

Abstract

The invention discloses a satisfaction optimization prediction fault-tolerant control method for a double-three-level inverter. A stator winding of the motor is opened; two ends of the stator windingare powered by two same inverters; the two inverters share the same set of direct-current bus to form a common-bus double-three-level topology; when an open-circuit fault occurs in a certain switchingdevice, the maximum output voltage of the inverter is reduced to half of the original output voltage; the voltage jump range is controlled to be set within Vdc / 2 through the inverter; a reference voltage vector is synthesized by using the available switching state of the inner hexagon of the common-bus double-three-level topology; the current following performance is taken as a main control target of the double-inverter system and a three-phase current satisfaction error function is established for optimizing the reference voltage vector; and the neutral point potential balance is taken as afinal control target, a neutral point potential satisfaction judgment function is established, and further the reference voltage vector is optimized through a comprehensive satisfaction error function.

Description

technical field [0001] The invention relates to the technical field of dual three-level inverters, in particular to a method for satisfying, optimizing, predicting, and fault-tolerant control of dual three-level inverters. Background technique [0002] The design of the fault-tolerant control method of the power converter in the prior art mainly includes parallel redundant phases, which usually adopts a cold standby mode, that is, during normal operation, the redundant bridge arm will not be switched to run, but in When an open-circuit fault occurs, the faulty bridge arm is replaced, and the fault-tolerant measures of parallel redundant phases increase the size of the equipment and increase additional costs. At the same time, it may be necessary to increase the external drive circuit, making the control more complicated; [0003] Another solution is to use the fault-tolerant capability of the topology itself. The modularity of the traditional topology H-bridge fully exerts i...

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Problems solved by technology

[0002] The design of the fault-tolerant control method of the power converter in the prior art mainly includes parallel redundant phases, which usually adopts a cold standby mode, that is, during normal operation, the redundant bridge arm will not be switched to run, but in When an open-circuit fault occurs, the faulty bridge arm is replaced, and the fault-tolerant measures of parallel redundant phases increase the size of the equipment and increase additional costs. At the same time, it may be necessary to increase the external drive circuit, making the control more complicated;

[0003] Another solution is to use the fault-tolerant capability of the topology itself. The modularity of the traditional topology H-bridge fully exerts its redundant fault-tolerant capability. It cuts off the full-bridge power units in the same position of the three phases at the same time when an open circuit fault occurs, so that 7 The phase voltage output level of the level H bridge cascaded topology will be reduced to 5 levels, but the traditional topology itself has weak fault tolerance, and the number of redundant switch states is small, and the health of the fault will be the same as the full bridge power at the same position Unnecessary overhead due to fault-tolerant approach to cell removal;

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