A Modular Multilevel Converter Multiple-Input Multiple-Output Frequency-Domain Impedance Modeling Method

A modular multi-level, frequency domain impedance technology, applied in design optimization/simulation, CAD circuit design, etc., can solve the problem of insufficient consideration of all coupling of phase sequence, and achieve the effect of improving accuracy

Active Publication Date: 2021-06-29
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In the past research, most researchers simplified the three-phase model of the modular multilevel converter into a single-phase model in order to simplify the model, which is not enough to consider all the coupling between phase sequences

Method used

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  • A Modular Multilevel Converter Multiple-Input Multiple-Output Frequency-Domain Impedance Modeling Method
  • A Modular Multilevel Converter Multiple-Input Multiple-Output Frequency-Domain Impedance Modeling Method
  • A Modular Multilevel Converter Multiple-Input Multiple-Output Frequency-Domain Impedance Modeling Method

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Embodiment Construction

[0078] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0079] figure 1 Shown is a schematic structural diagram of a modular multilevel converter topology according to an embodiment of the present invention, figure 2 Shown is a schematic flow chart of the MIMO impedance modeling method in the frequency domain of a modular multilevel converter according to an embodiment of the present invention.

[0080] Please refer to figure 1 , figure 2 , the multi-input multi-output frequency-domain impedance modeling method of the modular multilevel converter of this embodiment includes the following steps:

[0081] S11: Establish a time-domain nonlinear three-phase model of t...

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Abstract

The invention discloses a multi-input multi-output frequency-domain impedance modeling method for a modular multi-level converter, comprising: establishing a time-domain nonlinear three-phase model of the modular multi-level converter; Linearize the three-phase model to obtain a linear three-phase model in the time domain; calculate the harmonic values ​​corresponding to the steady-state operating point in the time domain in the frequency domain; based on the harmonic state space, perform a linear three-phase model in the frequency domain Harmonic expansion is carried out to obtain a linear three-phase harmonic state space model; the symmetrical transformation is expanded in the harmonic space, and the linear three-phase harmonic state space model is transformed into a positive and negative sequence harmonic state space model; the strong coupling frequency is determined from In the positive and negative sequence harmonic state space model, the positive and negative sequence components of the voltage and current at the AC port are extracted; based on the positive and negative sequence components corresponding to the outlet voltage and current, a frequency-domain impedance model with multiple inputs and multiple outputs is obtained by linear solution. Through the present invention, internal harmonic coupling and positive and negative sequence coupling are taken into consideration, which is more accurate.

Description

technical field [0001] The invention relates to the technical field of modular multilevel converters, in particular to a multi-input and multi-output frequency domain impedance modeling method for modular multilevel converters. Background technique [0002] With the rapid development of large wind farms, the demand for modular multilevel converter high-voltage direct current transmission (MMC-HVDC) solutions has increased significantly in recent years. Compared with traditional two-level voltage source converter-based direct current transmission (VSC-HVDC), MMC-HVDC has many advantages, such as modularity, high efficiency and lower loss, etc. However, the unique multi-frequency response characteristics of modular multilevel converters will lead to multiple harmonic couplings in a wide frequency range, which can easily lead to instability between wind farms and MMC-HVDC such as Oscillation etc. Therefore, it is very important to establish an accurate modular multilevel conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/30
Inventor 吕敬宗皓翔蔡旭
Owner SHANGHAI JIAO TONG UNIV
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