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Dynamic optimization control method and system for thermal performance of traction converter

A technology for traction converters and control methods, applied in the direction of conversion of AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of neglecting the thermal stress of traction converters, unbalanced thermal stress, Problems such as the loss of symmetry in the topology of the converter

Pending Publication Date: 2021-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, because the thermal stress of the power module is difficult to simply add to the traditional closed-loop control strategy, the thermal stress of the traction converter is ignored, especially in the application of multi-level traction converters. The problem of thermal stress imbalance between power devices in the medium power module is more prominent
At present, the reliability improvement technology of traction converters based on active temperature management has attracted widespread attention, but the related research is still in its infancy. The improvement of the electrothermal performance of the converter does not involve the complex situation that the fault of the system causes the loss of symmetry of the converter topology, and the phase current of the converter is no longer symmetrical and balanced.

Method used

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  • Dynamic optimization control method and system for thermal performance of traction converter
  • Dynamic optimization control method and system for thermal performance of traction converter
  • Dynamic optimization control method and system for thermal performance of traction converter

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Embodiment 1

[0036] This embodiment refers to a three-level traction converter system for a permanent magnet high-speed train. The traction converter can be further divided into a single-phase three-level rectifier and a three-phase three-level inverter. The specific topology is as follows figure 1shown. This embodiment will take the thermal performance dynamic optimization control of a three-phase three-level traction inverter as an example for illustration. The traction three-level inverter system adopts a speed-current double closed-loop control structure, and the outer control loop is a speed loop. According to The given value of the electromagnetic torque of the system can be obtained through the look-up table of the speed feedback; then, the maximum torque-to-current ratio (MTPA) and the full-speed embedded permanent magnet synchronous The motor control strategy obtains the given values ​​of the motor stator d-axis current and stator q-axis current, and uses this as the given input o...

Embodiment 2

[0129] Corresponding to the above method embodiments, this embodiment provides a traction converter thermal performance dynamic optimization control system, including a memory, a processor, and a computer program stored in the memory and operable on the processor, the processor executes The computer program realizes the steps of the above method.

[0130] To sum up, the methods and systems respectively disclosed in the above two embodiments of the present invention realize the traction transformer under normal operation of the integrated system by intelligently regulating the heat generated by the power module in the traction converter and the current path and voltage in the traction converter. The dynamic optimization control of the thermal performance of the traction converter integrates the enhancement of the thermal performance of the traction converter and the improvement of the thermal performance of the traction converter under system fault operation. The method is easy...

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Abstract

The invention relates to the technical field of power electronics, and discloses a dynamic optimization control method and system for thermal performance of a traction converter so as to realize dynamic optimization control of the thermal performance of the traction converter under the normal operation condition and the fault operation condition. The method comprises the following steps: constructing a prediction model of an electrical performance control quantity and a prediction model of a thermal performance control quantity of a to-be-tested traction converter; constructing an electrical performance control objective function according to the prediction model of the electrical performance control quantity, and constructing a thermal performance control objective function based on standard deviation coefficient dynamic weighting according to the prediction model of the thermal performance control quantity; based on the electrical performance control objective function and the thermal performance control objective function, constructing a reward function for representing performance normalization; determining a system level state combination set according with a preset condition according to the operation state of the system; and adjusting the electrothermal performance of the to-be-tested traction converter according to the target system level state combination.

Description

technical field [0001] The invention relates to the technical field of rail transit electric power, in particular to a dynamic optimization control method and system for thermal performance of a traction converter. Background technique [0002] As the core component system of high-speed trains, the traction drive system is mainly responsible for the task of traction driving the train to run at high speed and smoothly. The traction drive system is mainly composed of key equipment such as traction converters and traction motors. At present, the control strategies adopted by the traction drive system of high-speed trains in my country are based on the normal operation of the system to control the system, ignoring the difference in the actual implementation effect of the equipment on the control target, especially in the case of a system failure. , the differences caused by different devices, different types, and different positions are not only obvious, but also more diverse; in...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/088H02M1/32H02H7/122
CPCH02M7/53871H02M1/088H02M1/32H02H7/122
Inventor 杨超彭涛黄啸林高锦秋陶宏伟阳春华桂卫华陈志文樊欣宇
Owner CENT SOUTH UNIV
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