Three-phase fault-tolerant inverter circuit and control method thereof

Abstract

The invention discloses a three-phase fault-tolerant inverter circuit and a control method thereof. The three-phase fault-tolerant inverter circuit comprises a direct current power supply and an inverter bridge, the upper bridge arm of a first inverter bridge arm is connected with a high-speed fuse F1 while the lower bridge arm is connected with a high-speed fuse F4, the upper bridge arm of a second inverter bridge arm is connected with a high-speed fuse F3 while the lower bridge arm is connected with a high-speed fuse F6, and the upper bridge arm of a third inverter bridge arm is connected with a high-speed fuse F5 while the lower bridge arm is connected with a high-speed fuse F2; an auxiliary inverter circuit is connected between the direct current power supply and the inverter bridge and is composed of an auxiliary upper bridge arm insulated gate bipolar transistor Q7, an auxiliary lower bridge arm insulated gate bipolar transistor A8, an auxiliary first inverter bridge arm insulated gate bipolar transistor S1, an auxiliary second inverter bridge arm insulated gate bipolar transistor S2, an auxiliary third inverter bridge arm insulated gate bipolar transistor S3 and single-phase bridge rectifiers Z1, Z2 and Z3. The three-phase fault-tolerant inverter circuit and the control method thereof realize to isolate the fault of the bridge arm with short circuit or open circuit fault and have good fault-tolerant running function.

Description

technical field [0001] The invention belongs to the technical field of inverters, and in particular relates to a three-phase fault-tolerant inverter circuit and a control method thereof. Background technique [0002] Inverters are used to convert DC power into AC power. According to the nature of the DC side power supply, inverters are divided into current source inverters and voltage source inverters. The voltage source inverter has been widely used due to its simple structure, flexible control and many other advantages. However, the power electronic device is the weak link most prone to failure, and its reliability problem has not been effectively solved. The three-phase inverter usually adopts the standard three-phase bridge inverter structure, which does not have fault tolerance. In order to improve the reliability of the inverter, people usually design the inverter by derating the components or connecting redundant components in parallel. Inverter, but these two design...

AI Technical Summary

Problems solved by technology

The voltage source inverter has been widely used due to its simple structure, flexible control and many other advantages. However, the power electronic device is the weak link most prone to failure, and its reliability problem has not been effectively solved.

The three-phase inverter usually adopts the standard three-phase bridge inverter structure, which does not have fault tolerance. In order to improve the reliability of the inverter, people usually design the inverter by derating the components or connecting redundant components in parallel. However, these two design methods will make the system cost too high and increase the volume and weight. In the application where the pursuit of low cost and the installation space are limited, the reliability of the inverter is still very prominent.

Images