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Novel cascade power electronic device pre-charging active voltage-sharing method

A power electronic device and pre-charging technology, which is applied in the direction of circuit devices, power transmission AC networks, electrical components, etc., can solve the problem of uneven charging levels of each unit, so as to avoid uneven charging levels of units, low cost, and uniform charging. good pressure effect

Inactive Publication Date: 2021-07-06
SHANGHAI ELECTRICGROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the pre-charging process of the existing cascaded power electronic devices is prone to uneven charging levels of each unit

Method used

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  • Novel cascade power electronic device pre-charging active voltage-sharing method
  • Novel cascade power electronic device pre-charging active voltage-sharing method

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Embodiment Construction

[0021] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0022] Such as figure 1 As shown, taking the cascaded STATCOM main circuit as an example, the implementation scheme of a new type of cascaded power electronic device pre-charging active voltage equalization method in the present invention is as follows:

[0023] 1) Set the pre-charging resistor and bypass contactor in the main circuit of the STATCOM main circuit.

[0024] 2) After the pre-charging starts, the drive control system of the cascaded power units of each phase is powered on. The drive control system generally adopts a DC power supply method and detects the DC voltage of each phase cascaded power unit itself.

[0025] 3) The upper control system obtains the DC voltages of all cascaded power units of each phase, and calculates the average value of all unit voltages in real time.

[0026] 4) For a cascaded power unit wit...

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Abstract

The invention discloses a novel cascade power electronic device pre-charging active voltage-sharing method, which is characterized by comprising the following steps that a pre-charging resistor and a bypass contactor are arranged in a main loop; after the pre-charging is started, the driving control system of each phase cascade power unit is electrified; an upper-layer control system obtains the voltage of each phase of cascade power unit and calculates the average value of the voltage of all cascade power units in real time; for the cascade power unit with the voltage higher than the average value, the direct current side of the cascade power unit is bypassed, and charging of cascade power unit is stopped; and when the voltage of the cascade power unit in the step 4 drops to a set threshold range, normal charging of the cascade power unit is recovered. After pre-charging is started, the active voltage-sharing function in the pre-charging stage is achieved through control of the upper-layer control system, the voltage-sharing effect is good, the requirement for consistency of parameters and static losses of all unit devices is low, and meanwhile hardware cost is not additionally increased.

Description

technical field [0001] The invention relates to a novel cascaded power electronic device precharging active voltage equalization method, mainly aimed at medium and high voltage cascaded power electronic devices, such as medium and high voltage STATCOM, high voltage direct current transmission converter HVDC, etc., and belongs to the field of power electronics. Background technique [0002] In medium and high voltage power electronic devices, the cascaded topology is more commonly used. Before the operation of this type of device, in order to avoid the large current impact caused by direct closing and grid connection, it is generally equipped with a pre-charging link, which can effectively limit The inrush current when switching on, simultaneously charges the DC capacitors of each cascaded unit. [0003] At present, the following two schemes are mostly used in the pre-charging link of cascaded power electronic devices: [0004] 1) An additional pre-charging circuit is added ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02J3/18H02J3/36
CPCH02M7/48H02J3/1842H02J3/36Y02E60/60Y02E40/30
Inventor 王江涛叶傅华陈国栋吴鹏朱沁王山山黄国强
Owner SHANGHAI ELECTRICGROUP CORP
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