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

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...

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.

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