Modular multilevel converter with cells organized in clusters

A modular multi-level converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as difficult to obtain multiple input/output control structures, Meet the requirements of small three-phase AC filters, reduce the possibility, and increase the number of units

Active Publication Date: 2019-06-11
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when doing so, additional problems may arise
[0006] May be difficult to modulate voltages combining multiple cells at reasonably low switching frequencies
May be difficult to achieve sufficient insertion time for each cell for proper switching action
Can be difficult to obtain a control structure capable of handling multiple input / output (I / O) signals

Method used

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  • Modular multilevel converter with cells organized in clusters
  • Modular multilevel converter with cells organized in clusters
  • Modular multilevel converter with cells organized in clusters

Examples

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Embodiment Construction

[0038] Hereinafter, a detailed description of preferred embodiments of the present invention will be given.

[0039] figure 1 A simplified variant of a multilevel converter in the form of a cell-based voltage source converter 10 or a modular multilevel converter (MMC) is shown. Converters are used to convert between alternating current (AC) and direct current (DC). figure 1 The converter 10 in includes a three-phase bridge composed of a plurality of phase legs. In this case there are three phase legs. However, it should be realized that as an alternative there may be eg only two phase legs. Thus, there is a first phase leg PL1 , a second phase leg PL2 and a third phase leg PL3 . The phase leg is more particularly connected between a first DC terminal DC1 and a second DC terminal DC2, wherein the first DC terminal may be connected to a first pole P1 of a DC power transmission system such as a high voltage direct current (HVDC) power transmission system, And the second DC t...

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Abstract

A modular multilevel converter comprises a phase arm with cells organized into clusters and a converter control structure comprising a control objective control unit (12), at least one cluster selecting unit (14A, 4B) and cluster control units (16A 16J), one for each cluster, where the control objective control unit (12) determines a number of cells (*np) of a phase arm needed to be used for meeting a control objective and informs the cluster selecting unit (14A), the cluster selecting unit (14A) obtains, from every cluster control unit (16A, 16J), a cluster voltage measure (vc1, vc10),selectsat least one first cluster (CL1) based on the obtained cluster voltage measures using an inter-cluster priority scheme and orders a first cluster control unit (16A) to control cells of the first cluster, which then selects cells and controls them to change conduction state according to an intra-cluster cell priority scheme.

Description

technical field [0001] The invention relates to a modular multilevel converter, as well as a method and a computer program product for controlling units in the modular multilevel converter. Background technique [0002] Modular multilevel converters make sense for use in many different power transmission environments. They can be used, for example, as voltage source converters in direct current (DC) power transmission systems such as high voltage direct current (HVDC) and alternating current (AC) power transmission systems such as flexible alternating current transmission systems (FACTS). [0003] In these converters there are multiple cascaded cells, each cascaded cell comprising multiple switches and energy storage elements providing the cell voltage, where the cells can be controlled to either Exit the cell voltage in the middle to help form the waveform in the phase leg. [0004] At the same time, the voltage levels to be supplied by these converters have increased, eg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/00H02M1/32
CPCH02M1/00H02M1/32H02M7/483H02M1/0003H02M7/4835
Inventor S·诺加A·纳米F·迪吉库伊曾K·伊尔维斯冈崎佑平
Owner HITACHI ENERGY SWITZERLAND AG
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