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Flatness control method for modular multilevel matrix converter

A modular multi-level, matrix converter technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. stability issues

Pending Publication Date: 2020-10-02
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the PI control method of the input side current has obvious deficiencies in both simulation and actual engineering use, mainly reflected in slow response speed, easy overshoot, poor dynamic performance, and poor robustness of the control system. When the parameters of the control system change or external perturbations occur, the global stability of the system cannot be achieved

Method used

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  • Flatness control method for modular multilevel matrix converter
  • Flatness control method for modular multilevel matrix converter
  • Flatness control method for modular multilevel matrix converter

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Embodiment

[0068] refer to Figure 1 to Figure 16 , as an embodiment of the present invention, a flat control method for a modular multilevel matrix converter is provided. In this embodiment, the circuit topology of M3C is as follows image 3 and Figure 4 As shown, it is composed of 9 bridge arms, and each bridge arm is composed of k series-connected H-bridge sub-modules (Sub-Modular, SM) and an inductor L in series, and each H-bridge sub-module is composed of an H-full The bridge and a DC capacitor C are connected in parallel, and each H full bridge is composed of 4 IGBT antiparallel diodes T 1 ~T 4 composition. The input side and output side of M3C are three-phase AC symmetrical systems. The input side is usually a three-phase symmetrical AC voltage source, and the output side is generally connected to motors, resistive loads, or power grids. The system can operate in four quadrants. image 3 in, u mx and i mx Respectively, the three-phase voltage and current of the power grid ...

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Abstract

The invention relates to a flatness control method for a modular multilevel matrix converter. The method comprises the following steps of 1) establishing a corresponding M3C mathematical model according to an M3C circuit topological structure; 2) performing double alpha beta 0 transformation on the mathematical model to obtain an M3C decoupling model comprising an input side decoupling model, an output side decoupling model, a bridge arm capacitor voltage and loop current decoupling model and a common mode voltage decoupling model; 3) performing dq conversion on the input side decoupling model, and constructing an input side flatness control strategy based on the feedforward reference control quantity and the error feedback compensation quantity; and 4) carrying out PI control on the output side decoupling model, the bridge arm capacitor voltage and the loop current decoupling model, and combining the input side flatness control strategy, the common-mode voltage control, the H-bridge sub-module voltage sharing control and the carrier phase shift modulation to jointly complete the flatness control of M3C. Compared with the prior art, the method has the advantages of quickening the global stabilization speed, having no static error in tracking, being high in dynamic performance and the like.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a flat control method for a modular multilevel matrix converter. Background technique [0002] M3C (modular multilevel matrix converter, MMMC, modular multilevel matrix converter) is a bidirectional switch composed of many H-bridge units connected in series. Unlike semiconductor switching devices in traditional matrix converters, M3C has a fully modular , Simple expansion to high voltage levels, flexible control, good harmonic quality, good redundancy, etc. These unique advantages make it very suitable for high-power wind energy conversion systems. [0003] Due to the nonlinear and strong coupling characteristics of M3C, the control of M3C is very complicated and its development is extremely slow. Until now, the control research of M3C is still in the initial theoretical research stage, and there is no mature application at home and abroad. The current research...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/007H02M7/4835
Inventor 程启明马信乔江畅赵淼圳程尹曼
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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