Fault tolerant control method for open circuit faults of three-phase bridge PWM rectifier switching tube

A rectifier switching tube and open-circuit fault technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as insufficient fault conditions, and achieve improved three-phase current balance. Effect of reducing voltage ripple, improving system performance and reliability

Inactive Publication Date: 2015-08-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

From the perspective of reliability, it is not comprehensive enough to study only single-tube faults, and it is necessary to study the fault-tolerant method under simultaneous open-circuit faults of multiple tubes
[0004] In summary, the fault-tolerant control me

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  • Fault tolerant control method for open circuit faults of three-phase bridge PWM rectifier switching tube
  • Fault tolerant control method for open circuit faults of three-phase bridge PWM rectifier switching tube
  • Fault tolerant control method for open circuit faults of three-phase bridge PWM rectifier switching tube

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0036] figure 1 It is a schematic diagram of the main circuit topology of the three-phase bridge PWM rectifier of the present invention. The first to sixth switching tubes S 1 ~S 6 is a, b, c three-phase bridge arm power tube, D 1 ~D 6 are the first to sixth freewheeling diodes, L is the three-phase filter inductor, C f is the DC side filter capacitor, R L is the DC load, e a 、e b 、e c is the three-phase grid voltage, i a i b i c is the three-phase grid side current, the reference direction is as shown in the figure, U dc is the output voltage of the DC side, O is the midpoint of the AC side, and N is the negative pole of the DC side.

[0037] figure 2It is a control block diagram of the three-phase bridge PWM rectifier system and its fault-tolerant control method according to the present invention. The based system includes a three-phase PWM recti...

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Abstract

The invention discloses a fault tolerant control method for open circuit faults of a three-phase bridge PWM rectifier switching tube and belongs to the field of three-phase AC-DC (Alternating Current-Direct Current) conversion. The invention solves problems that multi-tube fault tolerant control is imperfect, the hardware cost is high and the like of the conventional fault tolerant scheme. According to the method, the characteristic that a local space voltage vector changes when a fault occurs to any switching tube of a three-phase bridge PWM rectifier is utilized; a PWM switching mode is corrected, i.e., a fundamental voltage vector is selected again and the action sequence and time is adjusted; and composition is conducted again to recover or approach an original rotary reference voltage vector, so that the normal operation of a system is maintained, and the fault tolerant control operation is achieved. According to the method disclosed by the invention, the effective fault tolerant control operation can be achieved when an open circuit fault occurs to a single switching tube and multiple switching tubes in the three-phase bridge PWM rectifier, and only a software algorithm is required. The method is simple and easy to achieve while no additional hardware cost is required.

Description

technical field [0001] The invention discloses a switch tube open-circuit fault fault-tolerant control method for a three-phase bridge PWM rectifier, belonging to the field of three-phase AC-DC conversion. Background technique [0002] Compared with the traditional uncontrolled rectification or phase-controlled rectification scheme, the three-phase bridge PWM rectifier has the advantages of controllable DC voltage, unit power factor, small grid-side current harmonics, and bidirectional flow of energy. Power occasions have been widely used. In PWM rectifiers, faults occur frequently due to the limitations of power switching devices' withstand voltage, current and impact resistance, or improper control, which seriously affects the operational reliability of the system. The survey shows that about 38% of the power conversion system failures are caused by the failure of power switching devices, mainly including short-circuit faults and open-circuit faults. The former will caus...

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Application Information

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IPC IPC(8): H02M7/219
Inventor 许政肖岚宋佩云
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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