Passive consistency control method for suppressing circulating current of modular multilevel converter

A modular multi-level, control method technology, applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of large system energy loss, slow dynamic response speed, long adjustment time, etc. question

Active Publication Date: 2020-06-23
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Passive consistency control method for suppressing circulating current of modular multilevel converter
  • Passive consistency control method for suppressing circulating current of modular multilevel converter
  • Passive consistency control method for suppressing circulating current of modular multilevel converter

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Embodiment 1

[0075] refer to figure 1 with 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 ...

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 consistency control method for suppressing the circulating current of a modular multilevel converter. The method comprises the steps of detecting upper and lower bridge arm currents of each phase, and building a three-phase internal unbalanced current equation; obtaining a circulating current dynamic equation under a dq rotating coordinate system according to theMMC three-phase internal unbalanced current equation, and obtaining an MMC circulating current PCHD model; constructing an MMC circulating current suppression passive consistency controller based on the PCHD model; inputting the second harmonic generation actual value and the reference value of the circulating current into an MMC circulating current suppression passive consistency controller so asto output a circulating current voltage compensation amount; carrying out carrier phase shift modulation on the circulating current voltage compensation amount so as to generate modulating waves, andcontrolling the working state of a switching tube in each phase bridge arm submodule of the MMC through the modulating wave so as to achieve the purpose of circulating current suppression. Accordingto the invention, the passive control theory is adopted, shaping is carried out through an expected energy function, so that the energy function is enabled to obtain the minimum value at the expectedbalance point, and the asymptotic stability of control is ensured.

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 Applications(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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