High-power four-quadrant converter fault-tolerant control method based on predictive control

A four-quadrant converter and fault-tolerant control technology, which is applied in the direction of converting AC power input to DC power output, converting AC power input to AC power output, and controlling electromechanical brakes, etc. It can solve the problem of decreased control accuracy and aggravated capacitor voltage imbalance To avoid personal safety accidents and huge economic losses, improve reliability and stability, avoid secondary failures and reduce control accuracy

Active Publication Date: 2021-07-30
SUZHOU RES INST SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the deficiencies of the prior art, the present disclosure provides a fault-tolerant control method for high-power four-quadrant converters based on predictive control, which effectively overcomes the aggravated phenomenon of capacitor voltage imbalance in traditional solutions and avoids the resulting In order to solve the problems of secondary faults and control accuracy drop, a new

Method used

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  • High-power four-quadrant converter fault-tolerant control method based on predictive control
  • High-power four-quadrant converter fault-tolerant control method based on predictive control
  • High-power four-quadrant converter fault-tolerant control method based on predictive control

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Experimental program
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Example Embodiment

[0044] Example 1:

[0045] This embodiment is proposed for the three-level midpoint clamp (3L NPC) back to back converter system, a bridge arm multiplex fault-tolerant control circuit is applied to three-level midpoint clamping back to back converter, and three Level midpoint clamp type back to back converter faulty bridge arm and multiplex bridge are connected by a bidirectional thyristor.

[0046] 3L NPC back to back converter model figure 1 As shown, it consists of a hexagonal arm, a DC bus, and a filter, each phase bridge arm is composed of four switch tubes and two reverse parallel diodes, and three levels can be output by administering different gate signals, and the DC bus line is The same capacitance as two capacitors. The back-to-back converter can be divided into the grid side and the motor side, and the grid side structure is connected to the three-phase power supply, and the motor side structure is driven by a three-phase inverter. Motor.

[0047]The advantage of the m...

Example Embodiment

[0057] Example 2:

[0058] The present disclosure provides a high-power four-state converter fault tolerance control method based on predictive control, and is applied to the three-level midpoint clamp type back to back converter, including the following process:

[0059] Get the fault bridge arm and the reuse of the converter parameter data after connecting the two-way thyristor;

[0060] The switch signal of the blocking faulty bridge arm is reorganized according to the acquired parameter data;

[0061] Traverse all combined switching status, predict the system status amount of the future at a certain moment;

[0062] The optimal combination switch state is obtained by the weighted and minimum of the network side cost function and the machine side price function.

[0063] The converter control is performed according to the optimal combined switching state.

[0064] The detailed control process refers to the control method provided in Example 1, and details are not described here...

Example Embodiment

[0065] Example 3:

[0066] The present disclosure provides a high-power four-like substanture fault tolerance control system based on predictive control, and is applied to the three-level midpoint clamping back to back converter, including:

[0067] The data acquisition module is configured to obtain converter parameter data that is connected to the fault bridge arm and the multiplex bridge by the two-way thyristor;

[0068] The switch status restructuring module is configured to block the switching signal of the fault bridge arm, and recombine the switching state of the converter according to the acquired parameter data;

[0069] The status quantity prediction module is configured to traverse all combined switching status, predict the system status amount of the future at a certain moment;

[0070] The optimal switching state acquisition module is configured to obtain the optimal combined switch state in the weighted and minimum of the network side cost function and the machine s...

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Abstract

The invention provides a high-power four-quadrant converter fault-tolerant control method based on predictive control. The method comprises the following steps: acquiring converter parameter data after a fault bridge arm and a multiplexing bridge arm are connected through a bidirectional thyristor; blocking the switching signal of the fault bridge arm, and recombining the switching state of the converter according to the obtained parameter data; traversing all combined switch states, and predicting a system state quantity at a certain moment in the future; taking the minimum weighted sum of the network side cost function and the machine side cost function as a target to obtain an optimal combined switch state; performing converter control according to the optimal combined switch state. According to the method, the phenomenon of capacitor voltage unbalance aggravation in a traditional solution is overcome, the problems of secondary faults and control precision reduction caused by the phenomenon are avoided, continuous operation of a converter system under the fault condition is fully guaranteed under the condition that the degree of freedom of the switching state is not limited, and the reliability and the stability of the electric drive system are better improved.

Description

technical field [0001] The present disclosure relates to the technical field of converter fault-tolerant control, in particular to a predictive control-based fault-tolerant control method for a high-power four-quadrant converter. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The three-level neutral-point-clamped (3L NPC) back-to-back converter has the advantages of small grid-side voltage / current harmonic distortion, low dv / dt value, and small grid-side filter size. , Widely used in industrial motor drive systems. However, the converter system in applications such as high-performance electric drive works for a long time under harsh working conditions such as high voltage, high current, strong electromagnetic interference, time-varying load, and limited heat dissipation, often due to power switching caused by semiconductor devices and ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M1/32H02M7/487H02P21/14H02P25/022H02P27/06
CPCH02M5/4585H02M1/32H02M7/487H02P21/14H02P25/022H02P27/06
Inventor 张祯滨张明远张振坤李真陈昊宇
Owner SUZHOU RES INST SHANDONG UNIV
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