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Low-voltage pre-charging system for high-voltage frequency conversion system and its control method

A high-voltage frequency conversion and control method technology, applied in electrical components, output power conversion devices, etc., can solve problems such as high cost and large space volume, and achieve the effects of limiting impact, reducing space volume, and reducing product cost.

Active Publication Date: 2018-01-05
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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Problems solved by technology

[0005] However, the cost of the high-voltage contactor (high-voltage switch) and high-voltage pre-charging resistor used in the prior art is relatively high, and the space occupied by it is relatively large. Therefore, this pre-charging scheme has become the key to restricting the effective cost control of high-voltage frequency conversion products. one of the factors

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  • Low-voltage pre-charging system for high-voltage frequency conversion system and its control method
  • Low-voltage pre-charging system for high-voltage frequency conversion system and its control method

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] figure 2 It is a schematic diagram of a low-voltage pre-charging system for a high-voltage frequency conversion system according to an embodiment of the present invention. Refer below figure 2 To describe the structure and function of the system in detail.

[0020] Such as figure 2 As shown, the low-voltage pre-charging system mainly includes: a high-voltage power supply, a low-voltage power supply, a high-voltage switch 21 , a transformer 22 and a low-voltage pre-charging circuit 23 . The input end of the high voltage switch 21 receives a high voltage power supply, and the output end thereof is connected to the primary side of the transformer 22 . The secondary side of the transformer 22 is connected to the high-voltage frequency conversion system. ...

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Abstract

The invention discloses a low-voltage pre-charging system for a high-voltage frequency conversion system and a control method thereof. The low-voltage pre-charging system includes: a high-voltage power supply; a high-voltage switch whose input terminal receives the high-voltage power supply; a transformer whose primary side is connected to the The output terminal of the high-voltage switch, its secondary side is connected to the high-voltage frequency conversion system; the low-voltage power supply; the low-voltage pre-charging circuit, its input terminal receives the low-voltage power supply, its output terminal is connected with the low-voltage winding of the transformer, and the low-voltage pre-charging circuit The charging circuit includes a precharge switch, a precharge resistor connected in series with the precharge switch, a sustain resistor connected in series with the precharge resistor, and a bypass switch connected in parallel with the sustain resistor. Compared with the high-voltage pre-charging circuit, the low-voltage pre-charging system of the present invention can greatly reduce the product cost, effectively reduce the space volume of the system, limit the impact of short-circuit current on the power system, and effectively reduce the power consumption of the pre-charging resistor.

Description

technical field [0001] The invention relates to the technical field of power electronics and high-voltage frequency conversion, in particular to a low-voltage pre-charging system used in a high-voltage frequency conversion system and a control method thereof. Background technique [0002] With the development of power electronics technology and the in-depth research on high-voltage inverter technology, high-voltage inverters are widely used in the drive systems of high-power mechanical equipment such as fans, water pumps, and compressors. [0003] There are energy storage elements such as capacitors in the high-voltage frequency conversion system. When the high-voltage switch is closed, an excitation surge current several times the rated current of the frequency conversion system will be generated. This excitation surge current will have a huge impact on the power frequency grid and the high-voltage frequency conversion system. , In serious cases, it will affect the normal s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
Inventor 何伯钧罗仁俊黄欢邓飞邓霆彭勃肖伟钟强陈志新王世平王博王飞鹏何健明雷立熊强汪小梅王龙陈孟君李萍
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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