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A fault diagnosis method for cascaded h-bridge converter based on voltage residual

A technology for converter faults and diagnosis methods, which is applied in the measurement of electrical variables, circuit breaker testing, instruments, etc., can solve problems such as difficulty in fault detection and positioning, and few diagnostic algorithms, and achieve the effect of online real-time monitoring.

Active Publication Date: 2020-08-07
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Fault diagnosis methods for single-phase pulse width modulation converters in railway traction systems have been proposed in related technologies. As far as single-phase cascaded H-bridge converters are concerned, due to the existence of more fault modes, fault detection and location are more difficult. At present, There are also fewer diagnostic algorithms proposed

Method used

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  • A fault diagnosis method for cascaded h-bridge converter based on voltage residual
  • A fault diagnosis method for cascaded h-bridge converter based on voltage residual
  • A fault diagnosis method for cascaded h-bridge converter based on voltage residual

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Embodiment

[0134] In order to verify the method of the present invention, the hardware structure is RT-LAB hardware-in-the-loop testing platform, and the model is a DSP controller of TMS320F28335.

[0135] Proceed as follows:

[0136] Step 1: Build a normal working model of a single-phase 3-cascade H-bridge converter on the RT-LAB platform, set the PWM switching frequency to 500Hz, the effective value of the grid side voltage to 4500V, and the DC side reference voltage to 3000V. Write the single-phase cascaded H-bridge converter control and fault monitoring program on the DSP to realize the normal operation of the single-phase cascaded H-bridge rectifier and carry out online fault monitoring.

[0137] Step 2: By controlling the loss of the control signal sent by the DSP, simulate the effect of the open circuit failure of the switch tube.

[0138] Step 3: Sampling at every other sampling interval to obtain the grid-side voltage u N , grid side current i N , DC side voltage u i real-ti...

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Abstract

The invention discloses a cascaded H-bridge converter fault diagnosis method based on voltage residual, which comprises the following steps: Step 1: According to the system switch control signal and the current polarity of the AC side, obtain the switch under normal conditions and different switch tube faults Function; Step 2: Obtain the input voltage calculation model of the single-phase cascaded H-bridge converter and the state estimation model of the corresponding module; Step 3: Obtain the theoretical analysis value of the voltage residual under different faults; Step 4: According to the voltage residual Design two types of counters to obtain the maximum value of the theoretical analysis value to locate the fault module, and further combine the switch signal to determine the fault switch tube; the present invention can be integrated into the controller, with good real-time performance, and realizes the single-phase cascaded H-bridge converter fault module and its Real-time diagnostics for open fault switches.

Description

technical field [0001] The invention relates to the technical field of electric traction AC drive, in particular to a fault diagnosis method for cascaded H-bridge converters based on voltage residuals. Background technique [0002] During the development of high-speed railway technology, traditional industrial inverters have the disadvantages of large size and low efficiency, which seriously hinder the improvement of the power and speed of high-speed trains. Traction drive technology based on power electronic traction transformer (PETT) is a typical solution at present. As far as the typical PETT topology is concerned, the single-phase cascaded H-bridge converter has the advantages of modularization, easy maintenance, and easy voltage balance as the front-end input. Its good control performance has a huge impact on the back-stage full-bridge isolated converter and even the entire load system. Therefore, a large number of control algorithms have been developed to improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/327
CPCG01R31/00G01R31/327
Inventor 葛兴来谢东
Owner SOUTHWEST JIAOTONG UNIV
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