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Modular multilevel converter over-modulation risk assessment method and system

A modular multi-level, 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 unreasonable simplification, inaccurate calculation of results, etc. problem, to achieve the effect of concise and clear judgment method

Pending Publication Date: 2022-04-05
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are defects in existing methods, such as the widely used overmodulation risk assessment method for modular multilevel converters from two-level converters; using the traditional overmodulation risk assessment method (Conventional Modulation Ratio, CMR) will introduce incorrect Reasonable simplification and thus inaccurate calculation of results

Method used

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  • Modular multilevel converter over-modulation risk assessment method and system
  • Modular multilevel converter over-modulation risk assessment method and system
  • Modular multilevel converter over-modulation risk assessment method and system

Examples

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Embodiment 1

[0035] Such as figure 1 As shown, this embodiment provides a modular multilevel converter overmodulation risk assessment method, including the following steps:

[0036] Define the dynamic modulation ratio;

[0037] According to the topology structure of the modular multilevel converter, the modulation signal of the modular multilevel converter is constructed, the amplitude of the corresponding harmonic component is obtained according to the modulation signal, and the amplitude of the corresponding harmonic component is obtained based on the amplitude of the corresponding harmonic component , to obtain the dynamic modulation ratio value of the modular multilevel converter;

[0038] Based on the value of the dynamic modulation ratio, it is evaluated whether there is an overmodulation risk in the modular multilevel converter.

[0039] In order to make the technical solution of this embodiment clearer, the overmodulation risk assessment method based on the dynamic modulation rat...

Embodiment 2

[0081] This embodiment provides a modular multilevel converter overmodulation risk assessment system.

[0082] A modular multilevel converter overmodulation risk assessment system, including:

[0083] a dynamic modulation ratio definition module configured to: define a dynamic modulation ratio;

[0084] The dynamic modulation ratio numerical calculation module is configured to: construct the modulation signal of the modular multilevel converter according to the topology structure of the modular multilevel converter, and obtain the amplitude of the corresponding harmonic component according to the modulation signal value, based on the amplitude of the corresponding harmonic component, the dynamic modulation ratio value of the modular multilevel converter is obtained;

[0085] An evaluation module configured to: evaluate whether there is an overmodulation risk in the modular multilevel converter based on the value of the dynamic modulation ratio.

[0086] It should be noted he...

Embodiment 3

[0088] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the overmodulation risk assessment method for a modular multilevel converter as described in the first embodiment above is implemented. A step of.

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Abstract

The invention belongs to the field of steady-state analysis and performance evaluation of AC / DC converters, and provides a modular multilevel converter over-modulation risk evaluation method and system. The method comprises the following steps: defining a dynamic modulation ratio; the method comprises the following steps: constructing a modulation signal of the modular multilevel converter according to a topological structure of the modular multilevel converter, obtaining an amplitude of a corresponding harmonic component according to the modulation signal, and obtaining a dynamic modulation ratio value of the modular multilevel converter based on the amplitude of the corresponding harmonic component; and evaluating whether the modular multilevel converter has an over-modulation risk based on the dynamic modulation ratio value.

Description

technical field [0001] The invention belongs to the field of steady-state analysis and performance evaluation of AC-DC converters, and in particular relates to a method and system for over-modulation risk assessment of modular multilevel converters. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Modular Multilevel Converter (MMC) has the advantages of modular structure, low switching loss, excellent harmonic performance, and direct series connection without semiconductors. With these advantages, it has been widely used in medium and high voltage DC. In the modular multilevel converter, the modulated signal is the bridge connecting the control unit and the main circuit of the AC-DC converter. According to the control target of the converter, the modulation signal is generated by the control unit and converted into the gate pulse of the I...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/088H02M1/12
Inventor 李可军刘智杰郭忠霖封璟
Owner SHANDONG UNIV
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