Active fault-tolerant control method for open-circuit fault of single switch tube of anpc three-level inverter

Abstract

The invention relates to an active fault-tolerant control method for an open-circuit fault of a single switching tube of an ANPC three-level inverter, comprising the following steps: 1) establishing a state space model of the ANPC three-level inverter; 2) according to the ANPC three-level inverter According to the topological structure of the power switch, the characteristic signal f of the three-phase fault after the open-circuit fault of the power switch tube is obtained; 3) Design the sliding mode controller according to the characteristic signal f of the three-phase fault after the open-circuit fault of the power switch tube; 4) Design the SVPWM fault-tolerant control module , and the active fault-tolerant control of the single-switch open-circuit fault of the ANPC three-level inverter. Compared with the prior art, the invention has the advantages of improved dynamic stability performance and robustness, fast and accurate fault-tolerant control, easy realization, convenient application, strong versatility and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an active fault-tolerant control method for an open-circuit fault of a single switching tube of an ANPC three-level inverter. Background technique [0002] With the rapid development of power electronics technology in my country's new energy power generation, high-speed electrified railway and other fields, multi-level inverters have been widely used, among which ANPC three-level inverters are more flexible due to their stable performance and balance control of losses And other advantages have gradually become the mainstream of multi-level inverters. However, compared with the two-level inverter, its topology and control methods are more complex, and the probability of internal device failure is greatly increased; especially for the power switch tube, which is most prone to open circuit failure, if a failure Failure to deal with it in time will affect the overall output...

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Problems solved by technology

[0003] At present, many scholars have conducted research on the fault-tolerant control of three-level inverters: Qiu Shiguang and Li Siguang have proposed a four-leg fault-tolerant three-level NPC inverter for the problem that inverter device faults are difficult to locate accurately. Topology; Zhou Pengfei, Chen Quan and other scholars took T-type three-level inverter as an object, and analyzed its fault-tolerant control strategy after an open circuit fault; Fu Wenxuan, Zhang Peng and other scholars analyzed the topology of ANPC three-level converter According to the characteristics of the structure, a fault-tolerant control strategy for power device open circuit is proposed

Most of the above methods are passive fault-tolerant control with a fixed structure or hardware redundant control that requires additional redundant equipment. , which further increases the volume and cost of the inverter, increases the complexity of the system, and reduces the reliability

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