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Control system and method for reducing MMC bridge arm current peak value

A current peak value, control system technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., to achieve the effect of reducing the peak value

Active Publication Date: 2022-07-29
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing research can reduce the peak value of the bridge arm current by controlling the double frequency circulating current and quadruple frequency circulating current of the MMC, but it is necessary to increase the capacitance of the sub-module capacitor to reduce the ripple of the sub-module capacitor voltage

Method used

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  • Control system and method for reducing MMC bridge arm current peak value
  • Control system and method for reducing MMC bridge arm current peak value
  • Control system and method for reducing MMC bridge arm current peak value

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Embodiment Construction

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. Of course, the examples described by referring to the accompanying drawings are only used to explain the present invention, and cannot be construed as a limitation of the present invention.

[0034] see attached image 3 , a control system for reducing the current peak value of the MMC bridge arm, comprising a voltage / power and current control module, a double-frequency circulating current control module and a quadrupling-frequency circulating current control module; the voltage / power and current control modules are used to generate three Phase modulation voltage reference value e aref , e bref , e cref ; The double-frequency circulating current control module is used to generate a three-phase double-frequency circulating current modulation voltage reference value e ci...

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Abstract

The invention relates to the technical field of electrical control, in particular to a control system and method for reducing an MMC bridge arm current peak value. The system comprises a voltage / power and current control module, a double-frequency circulation control module and a quadruplicated-frequency circulation control module. The voltage / power and current control module is used for generating three-phase modulation voltage reference values earef, ebref and ecref; the frequency doubling circulation control module is used for generating a three-phase frequency doubling circulation modulation voltage reference value eciraref2, a three-phase frequency doubling circulation modulation voltage reference value ecirref2 and a three-phase frequency doubling circulation modulation voltage reference value ecirref2; the quadruplicated frequency circulation control module is used for generating a three-phase quadruplicated frequency circulation modulation voltage reference value eciraref4, a three-phase quadruplicated frequency circulation modulation voltage reference value ecirref4 and a three-phase quadruplicated frequency circulation modulation voltage reference value ecirref4; and after the three-phase modulation voltage reference values (earef, ebref and ecref) are respectively superposed with frequency doubled circulation modulation voltage reference values (eciraref2, ecirbref2 and ecirref2) and frequency quadruplicated circulation modulation voltage reference values (eciraref4, ecirbref4 and ecirref4), pulse signals of each bridge arm sub-module of the MMC are generated through bridge arm voltage synthesis and a bottom layer modulation module.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a control system and method for reducing the current peak value of an MMC bridge arm. Background technique [0002] Modular multilevel converter (MMC), such as figure 1 As shown, with its structural modularity, low harmonics and low switching frequency, it has become one of the most attractive high-power high-voltage converter topologies. MMC based high voltage DC transmission (MMC-HVDC) is an effective solution for large-scale new energy friendly grid connection and reliable transmission, and its development is in the ascendant. [0003] MMC converter station grid-connected system, such as figure 2 As shown, its steady-state operating range is mainly limited by the following factors: bridge arm current peak value, sub-module capacitor voltage ripple, modulation ratio and bridge arm voltage output capability. Among them, the peak current of the bridge arm limits th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/088H02M1/32H02J3/38
CPCH02M7/53871H02M1/088H02M1/32H02J3/38
Inventor 桑顺史先强张雷薛晓岑黄杰杰
Owner NANTONG UNIVERSITY
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