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A Passive Consistency Control Method for Suppressing Circulating Current in Modular Multilevel Converters

A modular multi-level, control method technology, applied in the conversion of AC power input to DC power output, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of slow dynamic response, poor transient performance, long adjustment time, etc. question

Active Publication Date: 2021-01-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is that although the existing nonlinear control method solves the problem of nonlinear control to a certain extent, there are deficiencies in energy optimization, the energy loss of the system is too large, and its transient performance Poor, the adjustment time is too long, and the dynamic response speed is slow

Method used

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  • A Passive Consistency Control Method for Suppressing Circulating Current in Modular Multilevel Converters
  • A Passive Consistency Control Method for Suppressing Circulating Current in Modular Multilevel Converters
  • A Passive Consistency Control Method for Suppressing Circulating Current in Modular Multilevel Converters

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Embodiment 1

[0075] refer to figure 1 and figure 2 , the present embodiment provides a passive coherence control method for suppressing the circulation of a modular multilevel converter (modularmultilevelconverter, MMC), including the following steps:

[0076] S1, for each phase upper and lower bridge arm current i pj , i nj Sampling is performed, where j=a, b, c, represents the three phases a, b, and c; p, n represent the upper and lower bridge arms respectively. use the formula Calculates the three-phase internal unbalanced current. in is the DC component of the internal unbalanced current, i cirj It is the AC component of the internal unbalanced current, that is, the circulating current component. According to the unbalanced current equation inside the three-phase MMC, the circulation dynamic equation in the dq rotating coordinate system is obtained.

[0077] S2. According to the MMC three-phase internal unbalanced current equation, the circulation dynamic equation in the d...

Embodiment 2

[0123] refer to Figure 3-6 , A simulation model of a modular multilevel converter and circulation suppression is built in MATLAB / Simulink to verify the effectiveness of the circulation suppression of the present invention. The simulation parameters of this embodiment are shown in Table 1.

[0124] Table 1 Simulation parameters

[0125]

[0126]

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Abstract

The invention discloses a passive consistent control method for suppressing the circulating current of a modularized multilevel converter, which comprises the following steps of detecting the currents of the upper and lower bridge arms of each phase, and establishing a three-phase internal unbalanced current equation; According to the MMC three-phase internal unbalanced current equation, the circulation dynamic equation in the dq rotating coordinate system is obtained, and the MMC circulation PCHD model is obtained; the MMC circulation suppression passive consistency controller based on the PCHD model is constructed; the double frequency actual value of the circulation is compared with The reference value is input to the MMC circulating current suppression passive consistency controller to output the circulating current voltage compensation amount; the carrier phase shift modulation is performed on the circulating current voltage compensation amount to generate a modulation wave, and the switching tubes in the bridge arm sub-modules of each phase of the MMC are controlled by the modulation wave The working state of the invention achieves the purpose of suppressing the circulating current. The invention adopts the passive control theory, and through the shaping of the expected energy function, the energy function obtains the minimum value at the expected balance point, ensuring the gradual stability of the control.

Description

technical field [0001] The invention relates to the control field of modular multilevel converters, in particular to a passive consistency control method for suppressing the circulation of modular multilevel converters. Background technique [0002] At present, the modular multilevel converter (MMC) is widely used in the grid-connected system of the distributed power supply. The mathematical model of the MMC is simple. The switching of the output voltage can be realized, but since the MMC contains multiple sub-modules, with the switching in and out of each sub-module, it is difficult to achieve a complete balance of the capacitor voltage in the sub-module, causing the voltage imbalance between the bridge arms, and then forming a circulating current. [0003] In order to suppress the circulation generated during the operation of the MMC, the traditional vector control method does not start from the energy point of view, and cannot effectively control the nonlinear nature of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02J3/38
CPCH02J3/381H02M7/483H02M1/0048Y02B70/10
Inventor 薛花王育飞潘哲晓张宇华田广平扈曾辉杨兴武
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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