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Double-end cascaded five-level inverter fault tolerance modulation method for open winding motor

A modulation method and inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of complicated switching at the same time and the inability to realize fault-tolerant operation of two inverters, etc. problem, to achieve the effect of saving the switch

Inactive Publication Date: 2015-04-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The existing open-winding motor independent busbar structure double-ended cascaded five-level inverter fault-tolerant modulation method can only simply cut off one side of the inverter, and cannot realize fault-tolerant operation when two inverters fail at the same time, and the switching at the same time is complicated

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  • Double-end cascaded five-level inverter fault tolerance modulation method for open winding motor
  • Double-end cascaded five-level inverter fault tolerance modulation method for open winding motor

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Embodiment Construction

[0008] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0009] like figure 2 As shown, the reference voltage vector T is decomposed into two equivalent vectors T1 and T2, which are independently generated by inverter 1 and inverter 2 respectively. Taking the A-phase fault as an example, when at most four switching devices of the A-phase upper bridge arm of inverter 1 and the A-phase lower bridge arm of inverter 2 fail, the A(onn ), B(oon), C(opo, non), D(opp, noo), E(oop, nno), F(ono), O(ooo) seven voltage vectors can still be used normally, inverter 2 The seven voltage vectors A(onn, poo), B(oon, ppo), C(opo), D(opp), E(oop), F(ono, pop) and O(ooo) in the space vector diagram are still It can be used normally, combined with the space voltage vector modulation algorithm, using the above vector to synthesize the reference voltage vector, to realize the fault-tolerant operation of the sys...

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Abstract

The invention relates to a double-end cascaded five-level inverter fault tolerance modulation method for open winding motor. The method includes that a reference voltage vector T is resolved into two equivalent vectors T1 and T2 which are independently generated by an inverter 1 and an inverter 2 respectively; when at most four switching devices of any upper bridge arm of one inverter and a corresponding lower bridge arm of the other inverter are in fault, five voltage vectors A, B, C, D, E, F and O in space vector diagrams of the inverter 1 and the inverter 2 are still in normal use, the reference voltage vector is synthesized by the vectors, and fault tolerance operation of a system under the condition that a maximum output voltage is lowered by a half and a maximum output current is kept unchanged. The double-end cascaded five-level inverter fault tolerance modulation method for the open winding motor has the advantages that 1, fault tolerance operation under the condition that at most four switching devices of any upper bridge arm of one inverter and the corresponding lower bridge arm of the other inverter are in fault can be realized; 2, complex switches are omitted.

Description

technical field [0001] The invention relates to a fault-tolerant modulation method of an inverter, in particular to a fault-tolerant modulation method of a double-end cascaded five-level inverter with an independent busbar structure of an open-winding motor. Background technique [0002] The double-terminal three-phase open-winding motor has the advantages of high output voltage level, large number of output levels, and high fault tolerance. Key transmission occasions are becoming more and more important. The existing open-winding motor independent busbar structure double-ended cascaded five-level inverter fault-tolerant modulation method can only simply cut off one side of the inverter, and cannot realize fault-tolerant operation when two inverters fail at the same time, and the switchover is complicated at the same time . Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a fault-tolerant modulation method for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M1/32H02M7/483H02M1/325
Inventor 杜朋钟志祥童为为邵祥
Owner CHINA UNIV OF MINING & TECH
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