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DC superimposed ripple generating circuit for mmc sub-module capacitor test

A DC superimposition and generating circuit technology, applied to instruments, measuring electrical variables, measuring devices, etc., can solve the problems of large ripple voltage, high cost, difficult to produce, etc., and achieve a strong practical effect

Active Publication Date: 2021-04-13
XI AN JIAOTONG UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general method is to use a DC voltage source in series with an AC voltage source to charge the capacitor. However, this method requires two voltage sources, which is costly and difficult to generate a large ripple voltage.

Method used

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  • DC superimposed ripple generating circuit for mmc sub-module capacitor test
  • DC superimposed ripple generating circuit for mmc sub-module capacitor test
  • DC superimposed ripple generating circuit for mmc sub-module capacitor test

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Embodiment Construction

[0023] Attached below Figure 1-4 The present invention is described in detail with examples and examples, which belong to the explanation of the present invention rather than limitation.

[0024] figure 2 It is the most basic circuit structure of the DC superimposed ripple generating circuit used for the MMC submodule capacitor test in the present invention, and it includes the AC power supply AC, diode D, capacitor C, and resistor R of frequency f; wherein, capacitor C and resistor R is connected in parallel, and the RC parallel circuit section formed by the two is connected in series with AC power supply and diode D to form a circuit; in order to realize the voltage waveform of the MMC sub-module capacitor, half-wave rectification is performed on the AC power supply AC series diode D (silicon stack) , the voltage waveform under DC superimposed ripple condition is obtained by RC parallel oscillation.

[0025] exist figure 2 In the shown embodiment, since the capacitance...

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Abstract

The invention discloses a DC superimposed ripple generating circuit for performance testing of a sub-module capacitor of a modular multilevel converter (MMC). The circuit includes an AC power supply AC, a diode D, a capacitor C, and a resistor R; The diode D is connected in series with the AC power supply AC for half-wave rectification, and the DC superimposed ripple operating voltage is generated on the capacitor proportional unit through RC oscillation; it can also include an inductor L and a current limiting resistor R 1 , R 2 , the inrush current is limited by the inductance, and the current amplitude is limited by the current-limiting resistor. The DC superimposed ripple generating circuit only needs an AC power supply, a diode (silicon stack) and several RLC components, which effectively reduces the cost and can generate a large ripple voltage. It has strong practicability and can be used for capacitor temperature rise and aging test.

Description

technical field [0001] The invention belongs to the field of capacitor detection and voltage waveform generation, and in particular relates to a DC superimposed ripple voltage generation circuit used for performance testing of a modular multilevel converter (Modular Multilevel Convertor, MMC) sub-module capacitor and an application thereof. Background technique [0002] Compared with the traditional DC transmission technology, Voltage Source Converter High Voltage Direct Current (VSC-HVDC) technology has no reactive power compensation problem, no commutation failure problem, can supply power for passive systems and can The technical advantages of adjusting active power and reactive power at the same time are more and more widely used in power systems in the fields of island power supply, new energy grid connection, multi-terminal direct current transmission and urban distribution network capacity expansion. [0003] Modular Multilevel Converter (MMC) is an emerging voltage s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 高景晖姚睿丰曹均正黄金魁刘泳斌张社红张一恺钟力生
Owner XI AN JIAOTONG UNIV