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Multilevel converter vector modulation method and device based on model prediction

A technology of vector modulation and model prediction, which is applied in the field of vector modulation, can solve the problems of large amount of calculation, does not consider the current tracking error, is not suitable for multi-level converters, etc., and achieves the effect of small amount of calculation

Active Publication Date: 2021-04-30
HEFEI KEWELL POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the vector modulation method and device of the level converter in the prior art does not consider the problem of current tracking error and has a large amount of calculation, so it is not suitable for multi-level converters with more than three levels

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  • Multilevel converter vector modulation method and device based on model prediction
  • Multilevel converter vector modulation method and device based on model prediction
  • Multilevel converter vector modulation method and device based on model prediction

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Embodiment 1

[0054] A vector modulation method for multilevel converters based on model prediction, applied to multilevel converters, such as figure 1 Shown is a schematic diagram of a multi-level converter, each phase of the multi-level converter is composed of a phase bridge arm of the neutral point clamp converter NPC and an H-bridge converter cascaded, and the multi-level converter The output terminals of the H-bridge converter in each phase are serially connected with a filter inductor and a resistive load, and the non-serial terminals of the resistive loads of each phase of the multilevel converter are connected together. udc_1 and udc_2 are NPC DC side voltages, udc_a1, udc_b1, udc_c1 are three-phase H-bridge DC side voltages, ioa, iob, ioc are NPC neutral point currents, ia, ib, ic are converter three-phase output currents. When the H-bridge DC side voltage is set to half of the rated voltage of the NPC DC side capacitor, the system output is 7 levels. It should be noted that the ...

Embodiment 2

[0078] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention also provides a vector modulation device for a multilevel converter based on model prediction, which is applied to a multilevel converter, and the device includes:

[0079] The adjacent voltage vector acquisition module is used to calculate the reference voltage through the system reference current command, characterize the voltage vector through the gh coordinate system, judge the area to which the vector belongs through the coordinate relationship, and obtain the coordinates of the three adjacent voltage vectors used to synthesize the reference voltage;

[0080] The optimal duty cycle acquisition module is used to obtain the optimal duty cycle of the three adjacent voltage vectors satisfying the minimum current tracking error by calculating the error of the current tracking;

[0081] The vector modulation module is used to modulate the three adjacent voltage vectors and their ...

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Abstract

The invention discloses a multilevel converter vector modulation method and device based on model prediction, and the method is applied to a multilevel converter, and comprises the steps: calculating a reference voltage through a system reference current instruction, representing a voltage vector through a gh coordinate system, and judging an area to which the vector belongs through a coordinate relation; obtaining coordinates of three adjacent voltage vectors used for synthesizing the reference voltage; calculating the optimal duty ratios of the three adjacent voltage vectors meeting the minimum current tracking error through the current tracking error; modulating the three adjacent voltage vectors and the duty ratios corresponding to the three adjacent voltage vectors into driving signals, and controlling a switch to be switched on, so that the multilevel converter achieves the optimal current tracking performance; the method has the advantages that the multi-level converter achieves the optimal current tracking performance, the calculated amount is small, and the method is suitable for being applied to the multi-level converter with more than three levels.

Description

technical field [0001] The invention relates to the technical field of vector modulation, in particular to a method and device for vector modulation of a multilevel converter based on model prediction. Background technique [0002] Space Vector Modulation (SVM) is widely used in inverter modulation due to its high voltage utilization. When the output level of the circuit is large, the traditional SVM has a large amount of calculation and is not suitable for multi-level converters with more than three levels. The open-loop SVM also has the disadvantage of large current tracking errors in high-level circuits. [0003] Chinese patent application number CN201910902952.5 discloses a space vector modulation method based on the nearest level equivalent, which belongs to the field of power electronics technology. Firstly, the nearest level modulation principle is used to directly calculate the vector point closest to the origin among the three modulation points, and directly obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/487H02M1/08H02M1/088
CPCH02M7/483H02M7/487H02M1/08H02M1/088
Inventor 蔡振鸿谭卫花唐德平
Owner HEFEI KEWELL POWER SYST CO LTD