Current control system applicable to bifurcate modular multilevel converters

A modular multi-level, current control technology, applied in the conversion of AC power input to AC power output, conversion of AC power input to DC power output, electrical components, etc., can solve the problems of converter loss of stability and control variables , to achieve stable energy, controllable three-phase current, and good steady-state control effect

Active Publication Date: 2015-12-02
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

As an improved topology of conventional MMC, bifurcated structure MMC is suitable for low modulation ratio applications. Due to its complex structure, bifurcated structur

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  • Current control system applicable to bifurcate modular multilevel converters
  • Current control system applicable to bifurcate modular multilevel converters
  • Current control system applicable to bifurcate modular multilevel converters

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0020] Such as figure 1 As shown, it is a schematic diagram of a bifurcated structure MMC. The bifurcated structure MMC has six bridge arm groups, and the six bridge arm groups are respectively the first upper bridge arm group 1, the first lower bridge arm group 1, and the second upper bridge arm group 2. The second lower bridge arm group 2, the third upper bridge arm group 3, and the third lower bridge arm group 3. Each upper bridge arm group and the corresponding lower bridge arm group are conne...

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Abstract

The invention provides a current control method applicable to bifurcate modular multilevel converters. A first alternating-current port current control module uses two PIs to control the current under a synchronous rotating coordinate system, and outputs a d-q coordinate system component of the reference voltage at a first alternating-current port; a second alternating-current port current control module uses two PIs to control the current under a synchronous rotating coordinate system, and outputs a d-q coordinate system component of the reference voltage at a second alternating-current port; an alternating-current reference voltage decomposition module decomposes the reference voltages of the first and second alternating-current ports, and outputs the alternating-current reference voltage of each branch bridge arm; and a branch reference voltage generation module synthesizes the alternating-current reference voltage of each branch bridge arm and a corresponding direct-current reference voltage, and outputs a reference voltage of each branch bridge arm for modulation. A good steady-state control effect is achieved for bifurcate MMCs, the three-phase current is controllable, and the energy stability of each branch bridge arm is ensured.

Description

technical field [0001] The invention relates to the technical fields of flexible direct current transmission and power electronics in a power system, and in particular relates to a current control system suitable for a modular multilevel converter with a bifurcated structure. Background technique [0002] Modular multilevel converter (MMC) is widely used in the field of flexible DC transmission. It is a power electronic converter suitable for high-voltage and high-power applications. It has a modular structure, and the voltage stress of the power switch in the sub-module is small. Good harmonic performance and low loss. [0003] After searching, "Research Review of Module Combination Multilevel Converter" (Proceedings of the Chinese Society for Electrical Engineering, Vol. 33, No. 6, 2013), this document summarizes the control and application of conventional MMC. As an improved topology of conventional MMC, bifurcated structure MMC is suitable for low modulation ratio appli...

Claims

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Application Information

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IPC IPC(8): H02M5/293
CPCH02M7/493H02M7/4835
Inventor 张建文常怡然蔡旭
Owner SHANGHAI JIAO TONG UNIV
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