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Method for charging high-capacity voltage type frequency converter

A charging method and voltage-type technology, applied in electrical components, output power conversion devices, AC power input conversion to AC power output, etc., can solve problems such as explosion, damage to electrolytic capacitors in the intermediate circuit, and influence on normal production.

Active Publication Date: 2013-11-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the large-scale application of voltage-type inverters in factories, the task of replacing and repairing voltage-type inverters after damage has increased significantly. Since the spare parts of voltage-type inverters are generally stored in the warehouse for at least one year, it is necessary to The inverter is charged. The existing charging method is direct charging, which is easy to cause damage to the electrolytic capacitor in the intermediate circuit, or even the possibility of explosion, which seriously affects normal production.

Method used

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  • Method for charging high-capacity voltage type frequency converter
  • Method for charging high-capacity voltage type frequency converter
  • Method for charging high-capacity voltage type frequency converter

Examples

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Embodiment 1

[0035] This embodiment is suitable for voltage-type frequency converters with a capacity of 45-250KW. This implementation example charges Siemens 75KW voltage-type frequency converters of the Siemens series, the model of which is 6SE7031-5EF60. The voltage-type inverter has been placed in the warehouse for 2 years, such as figure 2The voltage-type inverter described is mainly composed of rectification part 1, intermediate DC link 2 and inverter part 3, and relay contact KM1 and resistor R1 are part of the pre-charging circuit. The three-phase bridge rectifier circuit as the rectification part 1 has six thyristors VD1 - VD6 and has three input terminals U1 / L1, V1 / L2 and W1 / L3. The intermediate DC link 2 is mainly composed of electrolytic capacitor C1, and the inverter part 3 is composed of 6 fully-controlled power IGBT modules IGBT1-IGBT6, which realize frequency conversion and speed regulation through PWM pulse width modulation, and the three output terminals are U2 / T1, V2 / ...

Embodiment 2

[0043] This embodiment is suitable for voltage-type frequency converters with a capacity of 45-250KW. This implementation example charges a 90KW Fuji series voltage-type frequency converter in Japan, whose model is FRN90G11S. The voltage-type inverter is placed in the warehouse for 1 year, such as Figure 4 The voltage-type inverter described is mainly composed of a rectification part 5, an intermediate DC link 6 and an inverter part 7. The contactor KM4 and the resistor R8 are part of the pre-charging circuit. The three-phase bridge rectifier circuit as the rectifier part 5 has six thyristors VD7 - VD12 and three input terminals R, S, T. The intermediate DC link 6 is mainly composed of an electrolytic electrolytic capacitor C2, and the inverter part 7 is composed of 6 fully-controlled power IGBT modules IGBT7-IGBT12, which realize frequency conversion and speed regulation through PWM pulse width modulation, and the output terminals are U, V and W.

[0044] This embodiment is...

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Abstract

The invention relates to a method for charging a high-capacity voltage type frequency converter, which is characterized by charging the frequency converter through two stages of current-limiting circuits (4), which mainly comprises three sets of series resistors. The charging method comprises the following steps: firstly, the output ends of the current-limiting circuits (4) are connected with the input end of the voltage type frequency converter through two-stage current-limiting charging; the input ends of the current-limiting circuits (4) are connected with three-phase alternating current 380V; each phase of 380V is used for charging three input ends of the voltage type frequency converter through two series resistors; a rectification circuit is used for pre-charging an electrolytic capacitor (C1) through a pre-charged resistor (R1); and secondarily, a main contact of a first-stage current-limiting charging contactor (KM3) is used for connecting the other end of the resistor connected with a main contact of a contactor (KM3) to the three input ends of the frequency converter; each phase of 380V is used for charging the three input ends of the voltage type frequency converter through a resistor; and a rectification part (1) of the frequency converter is used for outputting positive voltage and directly pre-charging the electrolytic capacitor (C1). When the high-capacity voltage type frequency converter is charged by using the method, electronic elements can be prevented from being damaged.

Description

technical field [0001] The invention relates to a charging method for a large-capacity voltage-type frequency converter, specifically a charging method for a voltage-type frequency converter with a capacity of 45KW-250KW stored for more than one year. Background technique [0002] With the large-scale application of voltage-type inverters in factories, the task of replacing and repairing voltage-type inverters after damage has increased significantly. Since the spare parts of voltage-type inverters are generally stored in the warehouse for at least one year, it is necessary to The inverter is used for charging. The existing charging method is direct charging, which may easily cause damage to the electrolytic capacitor in the intermediate circuit, or even cause an explosion, seriously affecting normal production. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of direct charging of the existing large-capacity voltage-type inverter, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/46
Inventor 石磊韩向东乔聪明陈戈
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD