Working mode and control method for improving efficiency of charging station energy router system

A working mode and system efficiency technology, applied in charging stations, efficient vehicle charging, current collectors, etc., can solve problems affecting system response and reducing system efficiency, and reduce no-load loss and switching loss. The solution is simple and easy , The effect of low complexity of the control scheme

Pending Publication Date: 2020-09-01
QINGDAO TOPSCOMM COMM
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  • Application Information

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Problems solved by technology

[0003] In view of the above-mentioned defects and demands, the present invention proposes a working mode and a control method for improving the system efficiency of the energy router of the charging station. On the premise of ensuring the two-way flow function of the system energy, it solves the problems caused by the single working mode of the DC-DC converter of the system. The problem of reducing system efficiency caused by transformer loss and switching loss under load conditions, and it is simple and easy to implement without affecting system response

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  • Working mode and control method for improving efficiency of charging station energy router system
  • Working mode and control method for improving efficiency of charging station energy router system
  • Working mode and control method for improving efficiency of charging station energy router system

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Embodiment Construction

[0019] Hereinafter, specific embodiments of the present invention will be further described in conjunction with the accompanying drawings.

[0020] The topological diagram of the medium and high voltage electric vehicle charging station applied in the present invention is as follows figure 1 As shown, the front-end topology of the medium and high voltage charging station is a cascaded H-bridge structure to realize AC-DC conversion. Each H-bridge structure is connected with a series resonant isolated converter to realize DC / DC conversion. The outputs of all series resonant converters are connected in parallel to form a low-voltage DC bus for the use of low-voltage DC charging piles; the intermediate DC-DC link is a series resonant topology such as figure 2 As shown, S1, S4, S5, and S8 are the first group of IGBTs, and S2, S3, S6, and S7 are the second group of IGBTs. By adjusting the IGBT turn-on time and switching action duration, the output-input-output voltage ratio is gua...

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Abstract

The invention provides a working mode and a control method for improving the efficiency of an energy router system of a charging station, and belongs to the field of medium-high voltage electric vehicle charging stations. A synchronous continuous mode, a synchronous intermittent mode, a forward mode and a reverse mode are formed by controlling the switching-on moments and the switching action duration of all IGBTs (S1, S2, S3, S4, S5, S6, S7 and S8) of the series resonance type isolated DC-DC topology, and the DC-DC working mode state is determined and the working mode switching working stateis carried out by detecting the power of the whole charging station and comparing the power with the mode switching condition, so that the system can keep higher efficiency operation in a full-load range and has energy bidirectional flow capability and good dynamic characteristics.

Description

technical field [0001] The invention relates to the field of charging stations for medium and high voltage electric vehicles, in particular to a working mode and a control method for improving the system efficiency of an energy router of a charging station. Background technique [0002] The medium and high voltage electric vehicle charging station 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 subsequent stage often uses series resonance isolation Type DC-DC topology, the use of open-loop control can input and output voltage ratio relationship and can achieve soft switching in the full power range, improve efficiency, so it is widely used. However, the traditional open-loop solution does not consider the size of the load during the operation of the whole machine, a...

Claims

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Application Information

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IPC IPC(8): H02J7/02H02J7/00H02M3/335B60L53/60
CPCH02J7/0013H02M3/33584B60L53/60B60L2210/10H02M1/0048H02M1/0054Y02T10/70Y02T10/92Y02T10/7072Y02T90/12
Inventor徐鹏飞赵新举李鸿儒李健勋王庆园纪华丽金立亭
OwnerQINGDAO TOPSCOMM COMM