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Multi-objective optimization-based design method for converter for electric automobile

A multi-objective optimization and electric vehicle technology, applied in the design field of electric vehicle converters, can solve problems such as insufficient performance indicators, less reliability involved, no attention to electric vehicle converters, etc., to improve product competition force effect

Inactive Publication Date: 2019-02-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0003] At present, the multi-objective optimization research of power electronics has not paid attention to the electric vehicle converter and most of them only consider the optimization of a single or two objective functions, and are mainly aimed at the optimization of efficiency, power density or cost. and less about its reliability
In addition, for EV converters, it is not sufficient to optimize the performance indicators of the converter only under the rated load or several specific load conditions

Method used

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  • Multi-objective optimization-based design method for converter for electric automobile
  • Multi-objective optimization-based design method for converter for electric automobile
  • Multi-objective optimization-based design method for converter for electric automobile

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Embodiment

[0106] Taking an electric vehicle as an example, the original parameters of the electric vehicle and motor in step 2 are shown in Table 1 and Table 2. The test conditions of the electric vehicle are the standard (UDDS) cycle conditions. Substitute the original parameters of the electric vehicle and motor into the loss model and thermal model of the converter, and select a set of design variables (f sw , A chip ) = (10kHz, 70mm 2 ), according to step 1 to step 4, the junction temperature variation curve of the IGBT chip can be obtained, such as Figure 5 shown; from Figure 5 It can be seen that in the acceleration phase of the car, the IGBT junction temperature rises sharply, and in the deceleration phase, the junction temperature drops rapidly, while the junction temperature fluctuates slowly in the constant speed phase. Figure 6is the relationship between the specific energy consumption ε, the first fault mileage γ and the specific cost σ of the electric vehicle converte...

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Abstract

The invention discloses a multi-objective optimization-based design method for a converter for an electric automobile. Mainly from the specific cost of the converter, the first fault mileage and the specific energy consumption of the converter, a multi-objective optimization function is built, and an optimal solution set of design variables meeting constraint conditions is solved. The method comprises the following steps of determining an automobile driving condition; determining an automobile mathematical model and a motor mathematical model and assigning values to original electric automobile parameters; constructing the design variables, such as the chip area and the switching frequency, of the system performance optimization of the converter; building a loss model, a thermal model, a life model and a cost model of the converter; building a multi-objective function of the converter and equation or inequality constraint conditions; performing multi-objective optimization; and endingthe optimization process, and outputting an optimization result. According to the method, on the premise of meeting system design indexes, the cost and the loss can be reduced and the reliability is improved, so that the product competitiveness is improved.

Description

technical field [0001] The invention relates to the technical field of design power electronics, in particular to a design method for a converter for electric vehicles based on multi-objective optimization. Background technique [0002] Due to environmental protection and the global energy crisis, the development of electric vehicles has attracted the attention of more and more countries in recent years and has developed very rapidly. Electric vehicle converter is the heart of electric vehicles, which plays a vital role in the performance, safe operation and even market competition of electric vehicles. In order to improve the market competitiveness of enterprises, it is the common goal of electric vehicle manufacturers and developers to design electric vehicle converters that not only meet the high reliability of the system, but also have high power density and low operating costs. However, with the continuous improvement of loss, power density and reliability requirements...

Claims

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Application Information

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IPC IPC(8): H02M7/48B60L15/00
CPCB60L15/007H02M7/48
Inventor 王学梅罗旭张波
Owner SOUTH CHINA UNIV OF TECH
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