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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

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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 fault-tolerant control method for bridge arm multiplexing was established without limiting the degree of freedom of the switch state, which fully guaranteed the continuous operation of the converter system under fault conditions and better improved the The reliability and stability of the electric drive system avoids huge economic losses caused by converter failures in applications such as electric vehicles

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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Embodiment 1

[0045] This embodiment proposes a bridge arm multiplexing fault-tolerant control circuit for a three-level neutral point clamped (3L NPC) back-to-back converter system, which is applied to a three-level neutral point clamped back-to-back converter, and the three The faulty bridge arm of the level midpoint clamped back-to-back converter is connected to the multiplexed bridge arm through a bidirectional thyristor.

[0046] 3L NPC back-to-back converter model such as figure 1 As shown, it is composed of six-phase bridge arms, DC bus and filter. Each phase bridge arm is composed of four switching tubes and two anti-parallel diodes. Three levels can be output by giving different gate signals, and the DC bus is Consists of two capacitors with the same capacitance. The back-to-back converter can be divided into the grid side and the motor side as a whole. The structure of the grid side is that the DC bus is connected to the three-phase power supply through the active front-end recti...

Embodiment 2

[0058] Embodiment 2 of the present disclosure provides a predictive control-based fault-tolerant control method for a high-power four-quadrant converter, which is applied to a three-level neutral-point clamped back-to-back converter, including the following process:

[0059] Obtain the parameter data of the converter after the faulty bridge arm and the multiplexed bridge arm are connected through the bidirectional thyristor;

[0060] Block the switching signal of the faulty bridge arm, and reorganize the switching state of the converter according to the obtained parameter data;

[0061] Traversing all combined switch states, predicting the system state at a certain moment in the future;

[0062] The optimal combined switch state is obtained with the goal of minimizing the weighted sum of the network-side cost function and the machine-side cost function;

[0063] Converter control is performed according to the optimal combination of switching states.

[0064] For the detailed...

Embodiment 3

[0066] Embodiment 3 of the present disclosure provides a predictive control-based high-power four-quadrant converter fault-tolerant control system, which is applied to a three-level neutral-point clamped back-to-back converter, including:

[0067] The data acquisition module is configured to: acquire the parameter data of the converter after the faulty bridge arm and the multiplexed bridge arm are connected through the bidirectional thyristor;

[0068] The switching state reorganization module is configured to: block the switching signal of the faulty bridge arm, and reorganize the switching state of the converter according to the obtained parameter data;

[0069] The state quantity prediction module is configured to: traverse all combined switch states, and predict the system state quantity at a certain moment in the future;

[0070] The optimal switch state acquisition module is configured to: take the minimum weighted sum of the network-side cost function and the machine-si...

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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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