Middle-high voltage charging system control method based on series digital voltage stabilizer

A charging system and control method technology, applied in the direction of efficient vehicle charging, charging stations, control/regulation systems, etc., can solve the adverse effects of volume, cost and efficiency, reduce switching frequency and device withstand voltage level, reduce system volume, etc. question

Active Publication Date: 2020-10-23
QINGDAO TOPSCOMM COMM +1
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Problems solved by technology

[0002] The medium and high voltage charging system adopts the input series output parallel topology scheme, which reduces the switching frequency and device withstand voltage level of a single module on the AC side, so that the AC side can be directly integrated into the medium and high voltage power grid; the low voltage is obtained through the parallel connection of the output of the subsequent DC/DC stage. The DC bus provides charging loads, avoids the use of traditional power frequency transformers, increases the controllability of the system, reduces the system volume,...

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  • Middle-high voltage charging system control method based on series digital voltage stabilizer
  • Middle-high voltage charging system control method based on series digital voltage stabilizer
  • Middle-high voltage charging system control method based on series digital voltage stabilizer

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Embodiment Construction

[0030] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0031] The topological diagram of the middle and high voltage charging system based on series digital voltage stabilizer applied in the present invention is as follows figure 1 As shown, the AC side of the system uses N DC bus voltages U dc The H-bridge high-voltage module cascade structure is connected in series with the series digital voltage stabilizer and then directly merged into the medium and high-voltage AC power grid to realize AC / DC conversion; the topology of the series digital voltage stabilizer is as follows: figure 2 As shown, it is composed of M H bridges connected in series, and the DC bus voltage U of the H bridges n =U dc / 2 n , where n=1, 2, 3...M;

[0032] Each H-bridge structure is connected with a series resonant dual-active H-bridge isolation converter to realize DC / DC conversion and isolation, and 3N+3M DC / DC ...

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Abstract

The invention provides a middle-high voltage charging system control method based on a series digital voltage stabilizer, and belongs to the field of middle-high voltage electric vehicle charging stations. An output voltage of the series digital voltage stabilizer is controlled to be matched with a high-voltage cascade H-bridge module to form multi-level alternating current modulation voltage, theswitching frequency of the high-voltage cascaded H-bridge module is reduced, meanwhile, the size and inductance loss of a grid-side filter inductor are effectively reduced, and in cooperation with voltage stabilization control of a rear-stage DC/DC isolation stage of a digital series digital voltage stabilizer, voltage stabilization and balance of all modules of the system are guaranteed, so thesystem stably operates, and meanwhile system operation efficiency is improved.

Description

technical field [0001] The invention relates to the field of medium and high voltage charging systems, in particular to a control method for a medium and high voltage charging system based on series digital voltage stabilizers. Background technique [0002] The medium and high voltage charging system adopts the input series output parallel topology scheme, which reduces the switching frequency and device withstand voltage level of a single module on the AC side, so that the AC side can be directly integrated into the medium and high voltage power grid; the low voltage is obtained through the parallel connection of the output of the subsequent DC / DC stage. The DC bus provides charging loads, avoids the use of traditional power frequency transformers, increases the controllability of the system, reduces the system volume, and effectively improves the power density of the system. It is a favorable topology for low-voltage charging systems; Under the carrier phase-shift modulati...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02J7/04H02M3/335B60L53/22
CPCH02J7/02H02J7/04H02M3/33515H02M3/33523B60L53/22H02J2207/20Y02T10/70Y02T10/72Y02T10/92Y02T10/7072Y02T90/14
Inventor 王建华范建华徐鹏飞李健勋李鸿儒王庆园张建李伟吴雪梅卢峰林志超程艳艳叶齐
Owner QINGDAO TOPSCOMM COMM
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