Method of controlling running of modularized multi-level converter in low frequency model

A modular multi-level, operation control technology, applied in the conversion of AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as large fluctuations in capacitor voltage

Inactive Publication Date: 2013-10-02
SOUTHEAST UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose an easy-to-implement low-frequency mode operation control method of a modular multilevel converter, in which a certain high-frequency common-mode voltage is superimposed in the output voltage command of the modular multilevel converter, and the bridge arm A certain high-frequency circulating current is superimposed in the circulating current command. By co

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  • Method of controlling running of modularized multi-level converter in low frequency model
  • Method of controlling running of modularized multi-level converter in low frequency model
  • Method of controlling running of modularized multi-level converter in low frequency model

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings. A low-frequency mode operation control method for a modular multilevel converter includes the following steps:

[0057] Step 1: Deduce the expressions of the high-frequency common-mode voltage u0 and high-frequency circulating current ipc2x that need to be superimposed when the modular multilevel converter operates in low-frequency mode.

[0058] attached figure 1 It is a circuit structure diagram of a modular multilevel converter containing 3 phase units (x represents the phase unit label, x=u, v, w), attached figure 2 It is a circuit structure diagram of a modular multilevel converter with 2 phase units (use x to represent the phase unit label, x=p, n). Each phase is divided into upper and lower bridge arms, and each bridge arm is formed by cascading n sub-modules, Udc is the DC component of the DC side voltage udc, ux and ix are the outputs of the modular multilevel...

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Abstract

The invention relates to a method of controlling running of a modularized multi-level converter in a low frequency model, which belongs to the technical field of controlling multi-level power electronic converters. The method comprises the following steps: setting high frequency common mode voltage and high frequency ring current both required to be superimposed, revising a switching function of a submodule and bridge arm current, obtaining an expression of capacitance voltage differential coefficient of the submodule according to volt-ampere characteristics of capacitance of the submodule, and in order to allow the capacitance voltage of the submodule to only have high-frequency component, assuming high frequency common mode voltage is known to obtain a expression of the high frequency circular current; comparing a running frequency with a critical frequency to obtain frequency model selection signals, combining an energy control and a circular current control of a phase unit of the modularized multi-level converter, determining whether the high frequency common mode voltage and the high frequency circular current are required to be superimposed to an original instruction or not according to the frequency model selection signals, and generating voltage required to be superimposed in the bridge arm of the phase unit of the high frequency circular current by controlling. The method is easy to realize and strong in universality, and provides reference for low frequency application of the modularized multi-level converter.

Description

technical field [0001] The invention relates to a control method of a modular multilevel converter, in particular to an operation control method of a modular multilevel converter in a low-frequency mode, and belongs to the technical field of control of multilevel power electronic converters. Background technique [0002] The modular multilevel converter is a multilevel power electronic converter topology proposed in 2001. It realizes high voltage and multilevel output through the cascading of sub-modules, and has very good scalability. The modular multilevel converters are connected back to back to form a common DC bus, which is suitable for the field of "AC-DC-AC" power conversion, such as high-voltage frequency conversion speed regulation and electric locomotive traction. When a modular multilevel converter is used as a variable frequency speed control drive for a high-voltage motor, the motor side converter usually uses a modular multilevel converter with three phase unit...

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Application Information

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IPC IPC(8): H02M7/483
Inventor 王宝安商姣钱长远
Owner SOUTHEAST UNIV
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