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Mean value model in modular multilevel converter, and simulation method of the same

A modular multi-level, average value model technology, applied in the field of power electronics and flexible power transmission, can solve the problems of not reflecting the characteristics of MMC neutron module capacitor energy storage and speeding up the simulation speed, so as to improve the dynamic response and dynamic response Fast, Applicable Results

Active Publication Date: 2017-04-19
HARBIN INST OF TECH
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Problems solved by technology

The last one only retains the external characteristics of the converter, and the simulation speed is further accelerated. It is suitable for the research of the large-scale DC transmission network based on MMC at the system level, but this model is based on the control of the traditional two-level converter. Based on the method, it does not reflect the energy storage characteristics of the MMC neutron module capacitor

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  • Mean value model in modular multilevel converter, and simulation method of the same
  • Mean value model in modular multilevel converter, and simulation method of the same
  • Mean value model in modular multilevel converter, and simulation method of the same

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Embodiment Construction

[0025] The specific embodiments of the present invention will be described in detail below in conjunction with the drawings and examples, but the present invention is not limited by the specific examples.

[0026] The topology of the existing three-phase modular multilevel converter is as follows: figure 1 shown. Each phase is composed of upper and lower bridge arms, and each bridge arm is formed by cascading a resistor, an inductor, and N sub-modules with the same structure, and each sub-module is a half-bridge structure or other similar power sub-modules. The structure of the submodule is as follows figure 2 shown.

[0027] Such as image 3 As shown, this embodiment is figure 1 The average value model of the modular multilevel converter includes an equivalent model 1 on the AC side, an equivalent model 2 on the DC side, and an equivalent model 3 on the capacitor;

[0028] The equivalent model 1 on the AC side includes a three-phase circuit, and each phase circuit consi...

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Abstract

The invention relates to a mean value model in a modular multilevel converter (MMC), and a simulation method of the same, and belongs to the field of flexible power transmission, and power electronics. The mean value model in a modular multilevel converter, and the simulation method of the same aim at improving the accuracy of a mean value simulation model in a modular multilevel converter and accelerating dynamic response. The mean value model in a modular multilevel converter includes an alternating current side equivalent model, a direct current side equivalent model and a capacitor equivalent model. The mean value model in a modular multilevel converter, and the simulation method of the same can improve the dynamic response speed of the system by means of a method of extracting the equivalent capacitors individually from sub modules and utilizing the controlled voltage source to control the direct current side. The mean value model in a modular multilevel converter, and the simulation method of the same can control the switches of the alternating current side equivalent model and the direct current side equivalent model, and the equivalent capacitors and equivalent voltage of sub modules at the same time to control the simulation model to realize simulation of stable operation of the MMC, operation in fault, of the MMC, and starting of pre charging at the same time.

Description

technical field [0001] The invention relates to an average value model and a simulation method in a modular multilevel converter, belonging to the fields of flexible power transmission and power electronics. Background technique [0002] In recent years, Modular Multilevel Converter (MMC), as an emerging high-voltage and high-power AC-DC conversion technology, has attracted widespread attention. Its topology is formed by stacking multiple sub-modules with the same structure, and each sub-module is composed of a half-bridge topology and a set of capacitors. Compared with traditional two-level and three-level converters, MMC increases the number of sub-modules It can be flexibly extended to high voltage and high power, can work at a lower switching frequency, has the advantages of high conversion efficiency, small voltage and current peaks, and very low output voltage harmonic content, making it very suitable for The occasions of high-voltage and high-power electric energy co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02M7/483
CPCG06F30/20H02M7/483
Inventor 徐殿国李彬彬石绍磊徐梓高
Owner HARBIN INST OF TECH
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