Modular multilevel converter with cells organized into 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 difficulty in obtaining multiple input/output control structures, etc. Meet the requirements of small three-phase AC filters, speed up on-site work and debugging, and do not reduce the effect of voltage balance capability

Active Publication Date: 2020-05-15
HITACHI ENERGY SWITZERLAND AG
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  • 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 into clusters
  • Modular multilevel converter with cells organized into clusters
  • Modular multilevel converter with cells organized into 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 comprising phase legs with units organized into clusters and a converter control structure comprising control target control means (12), at least one cluster selection means (14A, 4B ) and cluster control means (16A, 16J), one cluster control unit per cluster, wherein the control target control means (12) determines the number of units of phase arms that need to be used in order to meet the control target and informs the cluster selection means (14A) , the cluster selection means (14A) acquires cluster voltage measurements from each cluster control means (16A, 16J) to select at least one first cluster (CL1) based on the acquired cluster voltage measurements using an inter-cluster priority scheme, and The first cluster control means (16A) is commanded to control the cells of the first cluster, which then selects the cells according to the intra-cluster cell priority scheme and controls them to change conduction states.

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 Patents(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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