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Modeling control method of modular multilevel converter based on singular perturbation

A modular multi-level, singular perturbation technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. problems, to achieve the effect of promoting rapid development, reducing difficulty and complexity, and simplifying governing equations

Active Publication Date: 2020-06-09
安可达技术(苏州)有限公司
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Problems solved by technology

[0005] The purpose of the invention is to overcome the shortcomings of existing large-scale power system modeling methods and complicated controller design

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  • Modeling control method of modular multilevel converter based on singular perturbation
  • Modeling control method of modular multilevel converter based on singular perturbation
  • Modeling control method of modular multilevel converter based on singular perturbation

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings.

[0050] Such as figure 1 As shown, the modeling control method of the modular multilevel converter based on the singular perturbation of the present invention includes the following steps,

[0051] Step (A), constructing the time-domain nonlinear state average model represented by the switching function used by the single-phase modular multi-level converter, the number of upper and lower bridge arm sub-modules of the single-phase modular multi-level converter topology Defined as 1, the operating characteristics of semiconductor switching components are represented by ideal switch discrete functions, and the upper and lower bridge arm sub-modules are represented by ideal switch and capacitor series circuits, where the voltage of the upper and lower bridge arm sub-modules is represented by capacitor C, and the single The equivalent inductance of the bridge arm is represe...

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Abstract

The invention discloses a modeling control method of a modular multilevel converter based on singular perturbation. Fast and slow subsystems are respectively analyzed according to different time scales for a system equation, variable type conversion is carried out by using a linear matrix and a nonlinear matrix, an equation set of which the system conforms to a singular perturbation system expression is deduced, order reduction processing is conducted on the system on the premise that perturbation parameters are sufficiently small, a simplified equation is obtained, and a modular multi-level converter controller is designed for the simplified equation, so that the control equation is simplified, the difficulty and complexity of controller design are reduced, and rapid development of a large-scale power system is greatly promoted.

Description

technical field [0001] The invention relates to the technical field of power system converters, in particular to a modeling control method for a modular multilevel converter based on singular perturbation. Background technique [0002] With the development of large-scale power systems and the continuous improvement of the country's demand for new energy power systems, modular multilevel converter topologies are widely used. Furthermore, it is particularly important for the control method of complex systems and the stability of feedback control. [0003] For general nonlinear systems, the classical control method is to design a classical current-loop and voltage-loop controller based on the system average equation, but for nonlinear multi-time-scale complex systems like modular multilevel converters, the full-order model is often variable The research on the stability of its dynamic equations and various dynamic characteristics requires a large amount of calculation, and it ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 顾晨杰
Owner 安可达技术(苏州)有限公司
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