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Modularization multi-level converter submodule grouping stair wave modulation method

A modular multi-level, modulation method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of infeasibility, difficulty in triggering pulse distribution, and difficulty in realizing secondary systems and other problems to achieve the effect of reducing requirements

Active Publication Date: 2013-07-10
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, when this kind of converter is applied to high-voltage and large-capacity occasions, a large number of sub-modules need to be connected in series, which makes the distribution of trigger pulses difficult, and the realization of the secondary system also becomes difficult or even unfeasible. Therefore, when the modular multilevel converter is applied to high-voltage and large-capacity occasions, it is necessary to reconsider the group control of many sub-modules to reduce the difficulty of trigger pulse distribution and make the secondary system easier to implement

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  • Modularization multi-level converter submodule grouping stair wave modulation method
  • Modularization multi-level converter submodule grouping stair wave modulation method
  • Modularization multi-level converter submodule grouping stair wave modulation method

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] A step wave modulation method for grouping sub-modules of a modular multilevel converter is provided, and the method includes the following steps:

[0038] Step 1: Divide the sub-modules in the commutation chain into N sub-module groups;

[0039] Step 2: Round the reference voltage of the sub-module group to obtain the rounded reference ladder wave voltage V stair_wave ;

[0040] Step 3: Assign trigger pulses to the sub-modules inside the sub-module group;

[0041] Step 4: Perform pressure equalization among sub-module groups.

[0042] In the step 1, the submodule group is a controllable voltage source, and the control signal of the controllable voltage source is the reference voltage V of the submodule group ref .

[0043] In said step 2, the reference ladder wave voltage after rounding Vstair_wave Expressed as

[0044] V ...

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Abstract

The invention provides a modularization multi-level converter submodule grouping stair wave modulation method. The method comprises the steps of dividing submodules in a commutation chain into N submodule groups, rounding reference voltages of the submodule groups to obtain rounded reference stair wave voltages Vstair_wave, distributing trigger pulses to submodules inside the submodule groups, and carrying out voltage-sharing among the submodule groups. According to the modularization multi-level converter submodule grouping step wave modulation method, the submodules are divided into the N submodule groups, each submodule group is taken as a controllable voltage source, stair wave modulation is adopted in the submodule groups, the N submodule groups adopt rounding correction, and therefore a purpose similar to carrier phase-shifting is achieved; and due to the fact that voltage stability control is carried out among the submodule groups by means of a proper voltage-sharing control method, difficulty of the stair wave modulation is reduced, and requirements of the modulation algorithm and the voltage-sharing control algorithm for software and hardware are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a step wave modulation method for sub-module grouping of a modular multilevel converter. Background technique [0002] The traditional thyristor-based DC transmission system uses phase-controlled rectification to convert three-phase AC power into six-pulse or twelve-pulse DC power, but this DC power transmission system needs to absorb a large amount of reactive power, especially when the AC side is faulty case. The DC transmission system based on the voltage source converter (VSC-HVDC) is equivalent to a controllable voltage source, which can operate in four quadrants and realize the independent adjustment of active and reactive power on the AC side, which is of great significance for the formation of DC power grids. Since the modular multilevel converter adopts a modular design, each sub-module contains a large capacitor to clamp the voltage, and its volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCH02M7/483H02M7/4835
Inventor 郭高朋温家良杨杰药韬尤夏吴婧王宇
Owner STATE GRID CORP OF CHINA
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