Multiphase motor channel fault ride-through operation control method

A multi-phase motor and fault ride-through technology, applied in the field of communication, can solve problems such as overcurrent or overvoltage, fault shutdown, inrush current, etc.

Active Publication Date: 2019-05-24
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to give full play to the advantages of high reliability of the multi-phase system, the system is required to be able to run through the online switching channel without stopping when one or several channels fail. However, the motor is an electromagnetically coupled whole. , due to the sudden change of the voltage and current of the stator winding of the motor, the transient flux linkage of the stator winding changes, and inrush current and bus overvoltage are generated in the remaining operating channels, causing a fault shutdown and making the online switching channel fail
For example, a single phase-to-ground or phase-to-phase short circuit of a stator winding in a certain

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0057] figure 1 Shown is a general diagram of the control method of a basic embodiment of the present invention.

[0058] A multi-phase motor channel fault ride-through operation control method, based on multiple converter channels connected to the bridge arms and windings of the multi-phase motor, including overcurrent protection for the AC side of the remaining channel inverter (ie, the motor winding side), The voltage stabilization control of the DC side of the remaining channel inverter, and the implementation of magnetic field compensation control of the multiphase motor by the remaining channel inverter during the fault ride-through transition process.

[0059] The overcurrent protection on the AC side of the inverter (that is, the motor winding side) uses an active shunt circuit to provide a path for the transient impact surge current, so that the impact surge current flowing through the stator winding of the remaining non-fault channel is transferred from the inverter ...

Embodiment 2

[0064] figure 2 A further example of Example 1 is shown. The difference with embodiment 1 is:

[0065] The shunt circuit is an active topology composed of multi-phase (the number of phases is the number of phases of one channel) fully-controlled power switching devices and current limiting resistors. This topology can be a multi-phase power switching tube such as a bidirectional insulated gate bipolar type Transistor (IGBT) anti-parallel bidirectional switch structure. The controller of the shunt circuit of each channel uses the stator winding current i of the channel ac As an input, if the winding current is lower than the inverter capacity safety lower limit threshold current I ac_L , the switch tube of the shunt circuit is blocked, the shunt circuit is closed, and the inverter works, if the winding current is higher than or equal to the safety upper limit threshold current I of the inverter capacity ac_H , the switch tube of the shunt circuit is triggered, the shunt ci...

Embodiment 3

[0068] Embodiment 3 is a further embodiment of Embodiment 1. The difference with embodiment 1 is:

[0069] The energy storage circuit is provided with a voltage-type energy storage medium (supercapacitor or chemical battery, etc.), and uses a three-level multiple phase-shifting DC bidirectional voltage source converter as the energy conversion control interface between the DC bus and the energy storage medium, reducing Switching device voltage and current stress, improved ripple filtering quality, smaller filters, and fault tolerant operation.

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Abstract

The invention discloses a multiphase motor channel fault ride-through operation control method. With the multiphase motor channel fault ride-through operation control method adopted, when a certain orseveral channels fail, fault-tolerant on-line channel switching non-stop ride-through operation is realized; and during a process in which the channel fails or the failed channel is removed, the over-current protection of the inverter alternating-current side (motor winding side) of the remaining operating channels, the voltage stabilization control of the inverter direct-current bus-bar side ofthe remaining operating channels and inverter magnetic field compensation integrated coordination control are implemented. With the method adopted, fast, stable and safe fault-tolerant on-line channelswitching non-stop ride-through operation of a multiphase motor is realized. The method can be used for high-power electromechanical energy conversion occasions such as ship propulsion, track traction and wind power generation.

Description

technical field [0001] The invention belongs to the technical field of AC motor control, and in particular relates to a multi-phase motor multi-channel running channel failure online cut-off non-stop through operation control method, so as to realize the motor multi-channel fast, stable and safe online cut-off non-stop through operation, application It is used in high-power electromechanical energy conversion occasions such as ship propulsion, rail traction, mining machinery transmission, metallurgical steel rolling, speed regulation of fan pumps, and wind power generation. Background technique [0002] With the development of power electronic devices and technologies, power converters can break through the traditional three-phase mode and adopt multi-phase mode, so that the motor can get rid of the limitation of the phase number of the grid. [0003] Compared with three-phase motors, the significant advantages of multi-phase motors (number of phases m>3) are as follows: ...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02P21/05H02P21/28H02P29/024
CPCY02B10/70
Inventor 姬凯许晓晖何金平林德荣夏焕锦
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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