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A mid-point potential balance control method and system based on anpc full-bridge three-level dab

A three-level, mid-point technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as mid-point potential imbalance, achieve fast dynamic response, strong anti-interference ability, and simple calculation process Effect

Active Publication Date: 2022-05-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a midpoint potential balance control method and system of a full-bridge three-level DAB, aiming at solving the problem of unbalanced midpoint potential in the full-bridge three-level circuit

Method used

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  • A mid-point potential balance control method and system based on anpc full-bridge three-level dab
  • A mid-point potential balance control method and system based on anpc full-bridge three-level dab
  • A mid-point potential balance control method and system based on anpc full-bridge three-level dab

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Embodiment

[0044] exist figure 2 In the shown three-level full-bridge DAB converter based on ANPC, the two half-bridge circuits are named HBA and HBB respectively. In HBA, the output of the bridge arm output point A relative to the midpoint O of the DC bus is V. A , in HBB, the output of the bridge arm output point B relative to the midpoint O of the DC bus is V B .

[0045] for image 3 The ANPC half-bridge circuit shown, which can output three levels {V dc1 / 2, 0, -V dc1 / 2}. The output level V of the full-bridge three-level circuit AB It is the difference between the output levels of the two half-bridge three-level circuits. When the capacitor voltage is balanced, the full-bridge three-level circuit can output five levels {V dc1 / 2, V dc1 / 2, 0, -V dc1 / 2, -V dc1 / 2}, when two half-bridge three-level circuits combine to output five levels, there are 9 switch states, as shown in Table 1.

[0046] Table 1

[0047]

[0048] In the above 9 combinations, the full-bridge out...

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Abstract

The invention discloses a mid-point potential balance control method and system based on ANPC full-bridge three-level DAB, and belongs to the technical field of multi-level converters. First of all, for the ANPC full-bridge three-level circuit, determine the switching mode to realize the step-up and step-down of the midpoint voltage, and realize the control of the midpoint voltage by selecting the step-up and step-down switching modes. Secondly, sample the DC side voltage and its midpoint voltage, and compare the sampled midpoint voltage with the upper and lower limits. When the midpoint voltage is higher than the upper limit, the step-down switching mode is adopted, and the midpoint voltage is lower than the lower limit. value, the boost switching mode is used. Otherwise, the switch mode remains the same. The modulation method provided by the invention is simple in calculation, can limit the ripple of the mid-point voltage to a set value, is compatible with various modulation strategies, has rapid dynamic response, and finally can significantly improve the anti-interference ability of the system.

Description

technical field [0001] The invention belongs to the technical field of multi-level DC / DC converters, and more particularly, relates to a mid-point potential balance control method and system based on ANPC full-bridge three-level DAB. Background technique [0002] Three-level topology has been used more and more because of its excellent performance. Among them, the widely used three-level circuit is the neutral point clamped three-level topology, mainly including: diode clamped (Neutral Point Clamped, NPC) three-level topology, T-type (T-type) three-level topology topology and Active Neutral Point Clamped three-level topology (Active Neutral Point Clamped, ANPC). All of the above three-level topologies can be extended to a full-bridge topology. The full-bridge topology can improve the capacity and voltage level of the system, and has great application prospects in high-voltage and high-power applications. [0003] Due to the parameter dispersion of switching devices and DC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/487
CPCH02M3/33576H02M7/487
Inventor 张宇曹清泉
Owner HUAZHONG UNIV OF SCI & TECH