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Modular multi-level inverter sub-module capacitor voltage balance control method

A modular multi-level, multi-level converter technology, applied in the direction of converting AC power input to DC power output, irreversible DC power input into AC power output, electrical components, etc., can solve the burden on the controller , Difficult to implement, large amount of calculation for sorting, etc., to achieve the effect of reducing the amount of calculation and increasing the complexity

Inactive Publication Date: 2015-05-13
TSINGHUA UNIV +1
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  • Application Information

AI Technical Summary

Problems solved by technology

For this method, when the number of cascaded sub-modules in the bridge arm reaches hundreds, the amount of sorting calculation is very large, which will bring a great burden to the controller, and it will even be difficult to implement
This has also become one of the main constraints that limit MMC to achieve higher voltage levels

Method used

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  • Modular multi-level inverter sub-module capacitor voltage balance control method
  • Modular multi-level inverter sub-module capacitor voltage balance control method
  • Modular multi-level inverter sub-module capacitor voltage balance control method

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Embodiment Construction

[0023] The method for reducing the capacitance value of the modularized multilevel converter proposed by the present invention, wherein the structural diagram of the modularized multilevel converter involved is as follows figure 1 As shown, the method includes the following steps:

[0024] (1) Set the number of sub-modules cascaded in the bridge arm of the modular multilevel converter as N, and collect the capacitor voltage U of all N sub-modules in the same bridge arm c(i) , i=1,2,3...N, calculate the average value U of the bridge arm sub-module capacitor voltage c_avg , U c _ avg = Σ i = 1 N U c ( i ) ...

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Abstract

The invention relates to a modular multi-level inverter sub-module capacitor voltage balance control method and belongs to the technical fields of voltage source inverters and direct current transmission. The method includes the steps that each sub-module control pulse delay control quantity by tracking the average value of sub-module capacitor voltage of an arm as a target, the rising delay time and falling delay time of the control pulse of the sub-module are controlled according to the direct current voltage adjusting direction and the arm current direction, and the average direct current electric current of a sub-module capacitor within a period is changed to achieve balance control of the sub-module capacitor voltage. The modular multi-level inverter sub-module capacitor voltage balance control method does not need complex sorting calculation, thereby greatly reducing calculation amount. The method can be used for a control unit distributed in each sub-module. The complexity of the implementation of the method is not increased with the increasing of the number of arm sub-module cascading. The method is especially suitable for a modular multi-level inverter of great level number.

Description

technical field [0001] The invention relates to a method for equalizing the capacitor voltage of a modular multilevel converter sub-module, and belongs to the technical fields of voltage source converters and direct current transmission. Background technique [0002] Modular Multilevel Converter (MMC) is easy to achieve a large number of levels, and can provide a common DC side, which can be easily realized back-to-back connection, making it very suitable for DC transmission application. The emergence and development of MMC technology makes it possible to realize higher voltage, larger capacity and higher performance voltage source converters in the field of direct current transmission, which greatly promotes the development of voltage source direct current transmission technology. Since the emergence of MMC technology, most of the voltage source DC transmission projects have adopted the MMC topology or changes based on it. At present, the DC voltage level of voltage sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49H02M7/501
CPCH02M7/4835
Inventor 宋强朱喆李建国杨文博许树楷黎小林刘文华
Owner TSINGHUA UNIV
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