Control method for reducing high-frequency pulsating current on direct current side of modular multilevel converter
A modular multi-level, high-frequency pulsating technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the maximum active power and reactive power drop of MMC, limit the application problems such as occasions, to achieve the effect of high practical value, wide application occasions, and improvement of current and power quality
Active Publication Date: 2021-05-14
LIYANG RES INST OF SOUTHEAST UNIV +1
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Problems solved by technology
Although this method can suppress the DC pulsating current, the setting of the carrier and the modulation process lead to the problem that the maximum active power and reactive power that the MMC can transmit are significantly reduced, which greatly limits its application
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[0044] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0045] A kind of control method for reducing the high-frequency pulsating current on the DC side of the MMC proposed by the present invention sets two sets of different triangular carrier waves for each bridge arm of the three-phase MMC, which are used to modulate the fundamental frequency reference wave and the double frequency reference wave respectively, The number of each group of carriers and the overall modulation method are given, and the phase of each carrier is adjusted according to the result of the control algorithm in each carrier period, so that the sum of the voltage pulses on the bridge arm inductance is always equal to zero, thereby eliminating the bridge ...
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The invention discloses a control method for reducing high-frequency pulsating current on a direct-current side of a modular multilevel converter (MMC), which comprises the following steps of: arranging two groups of phase-adjustable triangular carriers on each bridge arm of a three-phase MMC, respectively modulating a fundamental component and a double frequency component of a reference wave, summing the two groups of modulation results, and subtracting M / 2 to obtain the number of modules needing to be input by the bridge arm; and finally, obtaining a driving signal of each module through a sorting and voltage-sharing method; in each carrier period, adjusting the carrier phase of each phase, so that voltage pulses on the three-phase bridge arm inductors are mutually counteracted, and corresponding current zero-sequence components are eliminated and do not flow into the direct-current bus, thereby reducing high-frequency current harmonics on the direct-current bus. According to the invention, the problem of high-frequency pulsating current at the DC side of the MMC caused by frequency doubling circulation control is improved, and the current and power quality at the DC side of the MMC are improved.
Description
technical field [0001] The invention relates to a control method for reducing the high-frequency pulsating current at the DC side of a modularized multilevel converter, and belongs to the technical field of high-power multilevel power electronic converters. Background technique [0002] Modular multilevel converter (MMC) adopts a multi-module cascaded structure. Compared with traditional two-level and three-level converters, MMC is easier to expand, and has higher efficiency and smaller output harmonics, so it is very It is suitable for medium-voltage and large-capacity power electronic conversion applications, and has great application prospects in the fields of medium-voltage motor drives, medium-voltage distribution networks, static synchronous compensators, and unified power flow controllers. [0003] Double frequency circulation is an important operating feature inside the MMC. In order to reduce the internal loss or optimize the loss distribution and other purposes, t...
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Login to View More IPC IPC(8): H02M7/483H02M1/088
CPCH02M7/483H02M1/088
Inventor 邓富金喻强
Owner LIYANG RES INST OF SOUTHEAST UNIV