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Pre-charging apparatus used for voltage source converter and with line fault detection function

A technology for voltage source converters and line faults, applied in emergency protection circuit devices, output power conversion devices, measurement devices, etc. Compact structure, clever overall design, avoid short circuit effect

Pending Publication Date: 2017-05-10
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the presence of supporting capacitors in voltage source converters, the capacitors are equivalent to short-circuiting the main circuit at the moment when the main power supply is switched on, so a pre-charging device is required to limit the charging current of the capacitor when the main circuit is powered on; at the same time, some use The special occasion of the voltage source converter has higher requirements for continuous power supply. When the load of the converter fails, the converter is allowed to be protected, but when the load fault is removed, the converter is required to be automatically and quickly put into operation, so it is necessary to convert the current The device has a main circuit fault detection device. The existing pre-charging method mainly adopts an open-loop current-limiting pre-charging method. In the process of pre-charging, if the main circuit fails, it is impossible to make a quick judgment and protection.
Based on the above problems, those skilled in the art constantly try new solutions, but this problem has not been well resolved

Method used

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  • Pre-charging apparatus used for voltage source converter and with line fault detection function
  • Pre-charging apparatus used for voltage source converter and with line fault detection function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: see figure 1 , a pre-charging device for voltage source converter with its own line fault detection function, the pre-charging device includes a pre-charging contactor K, a step-up transformer T, a current limiting resistor R, 1 A high withstand voltage rectifier bridge D, a DC voltage sensor LEMU and a main control board CPU, one end of the precharge contactor K is connected to the primary side of the step-up transformer T, and the other end is connected to the precharge source AC; One end of the secondary side of the voltage transformer T is connected to the current limiting resistor R, and the other end is connected to the incoming end of the high withstand voltage rectifier bridge; the primary side of the step-up transformer T is connected to the precharge contactor K; the current limiting resistor R is set between the secondary side of the boost transformer and the high withstand voltage rectifier bridge D. One end of the AC incoming line side of the hig...

Embodiment 2

[0022] Example 2: see figure 2 , is provided with a line fault detection device with a precharge device, the fault detection device includes a precharge device, a main power supply, a main switch S, a voltage source converter and a support capacitor C, and the input end of the precharge device is connected to the precharge auxiliary power supply , the output end and the two ends of the supporting capacitor C; the main power supply is connected to the input end of the main switch S; the output end of the main switch S is connected to the voltage source converter.

Embodiment 3

[0023] Example 3: see figure 1 , figure 2 , a pre-charging control method for a pre-charging device with a self-contained line fault detection function of a voltage source converter, characterized in that the method is as follows:

[0024] Step 1: Turn off the main switch S, the main control board CPU controls the precharge contactor K to close, the power supply AC flows through the precharge contactor K and the current limiting resistor R, and after being rectified by the high withstand voltage rectifier bridge D, the support The capacitor C is charged until the main control board CPU detects that the voltage value of the support capacitor C reaches the preset value;

[0025] Step 2, disconnect the main switch S and the precharge contactor K, and cut off the precharge device;

[0026] In step 3, the main switch S is closed, the precharge contactor K is disconnected, the voltage source converter is connected to the power grid, and the voltage source converter is put into op...

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Abstract

The invention relates to a pre-charging apparatus used for a voltage source converter and with a line fault detection function. The pre-charging apparatus is characterized by comprising a pre-charging contactor K, a voltage-boosting transformer T, a current-limiting resistor R, a high-voltage-resistant rectifying bridge D, a direct current voltage sensor LEMU and a main control panel CPU. By integrating the pre-charging function and the line fault detection function of the voltage source converter, the pre-charging function and the line fault detection function can be obtained at the same time.

Description

technical field [0001] The invention relates to a precharging device, in particular to a precharging device and a line detection device used for a voltage source converter with a line fault detection function, belonging to the technical field of voltage source converters. Background technique [0002] Due to the existence of supporting capacitors in the voltage source converter, the capacitor is equivalent to a short circuit to the main circuit at the moment when the main power is closed. Therefore, a pre-charging device should be set up to limit the charging current of the capacitor when the main circuit is powered on; at the same time, some use The special occasions of the voltage source converter have higher requirements for continuous power supply. When the converter load fails, the converter is allowed to protect, but when the load fault is removed, the converter is required to be automatically and quickly put into operation. Therefore, a converter is required. The devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02H7/12G01R31/02
CPCH02H7/12H02M1/36G01R31/50
Inventor 谭国俊李辉郑旺刘战杨波冯维
Owner CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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