Control method of pure electric automobile modular multi-level converter
A modular multi-level, pure electric vehicle technology, applied in the field of control, can solve the problems of increasing computing burden, large computing burden, and large computing amount, and achieve the effect of reducing computing burden, reducing computing amount, and avoiding hardware requirements.
Active Publication Date: 2019-04-12
JILIN UNIV
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Problems solved by technology
[0003] 1. Traditional electric vehicles need a common three-phase two-level inverter with a battery management unit for motor drive and battery control, which requires a lot of hardware
[0004] 2. The existing predictive control of modular multilevel converters is usually only one-step prediction, which does not really reflect the optimal solution characteristics of predictive control
[0005] 3. The number of sub-modules of the modular multi-level converter is large, and the calculation burden is heavy. For example, for a five-level modular multi-level converter, there are 8 sub-modules on each bridge arm, and among the 8 sub-modules There must be 4 to maintain the "input" state to maintain the DC side voltage as a constant value
If it is a 13-level modular multilevel converter, it needs to calculate For 15 levels, 1550000000 cases need to be calculated. It can be seen that the calculation amount is particularly large. If multi-step prediction is performed, the calculation burden will be increased.
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[0059] The present invention mainly aims at the control problem of the special modular multilevel converter used for driving the pure electric vehicle, and designs a layered controller to control it. The upper layer is a multi-step finite set predictive control, and the number of sub-modules in the "input" state in the upper and lower bridge arms of the same phase is used as the control output of the layer algorithm and the input of the lower layer algorithm. The lower layer is the battery voltage sorting algorithm, and the final equalization sub-module battery voltage. The invention can perform multi-step predictive control of the modularized multi-level converter under the condition of less calculation amount, and finally balance the battery voltage value.
[0060] The present invention utilizes a layered control method to design a controller: the first layer uses finite set predictive control, and by minimizing the designed objective function, the number of sub-modules in t...
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The invention relates to a control method of a pure electric automobile modular multi-level converter, and belongs to the technical field of control. The invention aims to solve the problem in specialmodular multi-level converter control for pure electric vehicle driving, and the control method of the pure electric automobile modular multi-level converter by designing a layered controller is disclosed. The method comprises the following steps that (1) a modular multi-level converter mathematical model is established; (2) a finite set prediction controller control target function is designed;and (3) optimization and solving of a multi-step finite set prediction control screening algorithm is carried out. According to the method, the optimal and sub-optimal conditions are taken into consideration at the same time, and the situations are considered in some research, while all the switches are considered in the next time domain; and the method of the invention has the advantages that theoptimal and sub-optimal conditions and the left and right electric level numbers are used as alternative selection, so that the calculation burden is further reduced.
Description
technical field [0001] The invention belongs to the technical field of control. Background technique [0002] Electric vehicles (BEVs) have developed rapidly in recent years, but there are still many key issues to be solved that restrict them from replacing traditional vehicles, such as short battery life and long charging time. Because of this, research on improving battery performance is booming. The battery cells of BEVs usually need to meet the requirements of the converter to drive the motor. However, due to the differences in the chemical characteristics of the battery cells, the voltage imbalance will occur during charging and discharging, which will continuously bring damage to the battery and will Reduced battery life. For high-power electric transmission applications such as electric vehicle traction, the high-voltage power electronic converter can not only improve the speed regulation performance of the system, but also improve the efficiency of power conversion...
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Login to View More IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 许芳曲雅丽曲逸陈虹
Owner JILIN UNIV