Control method for reducing high-frequency pulsating current on DC 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 occasions, etc., to achieve the effect of high practical value, wide application occasions, and reduction of high-frequency harmonic currents
Active Publication Date: 2022-04-08
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 the high-frequency pulsating current on the DC side of a modular multi-level converter. Each bridge arm of a three-phase MMC is provided with two sets of phase-adjustable triangular The frequency component and the double frequency component are modulated, and the results of the two sets of modulation are summed and then subtracted M / 2, to get the number of modules that need to be put into the bridge arm; and then through the sorting and equalizing method, the final driving signal of each module is obtained. In each carrier cycle, adjust the carrier phase of each phase, so that the voltage pulses on the three-phase bridge arm inductors cancel each other out, and the corresponding current zero-sequence components are eliminated, and will not flow into the DC bus, thereby reducing the high voltage on the DC bus. frequency current harmonics. The invention improves the problem of high-frequency pulsating current on the MMC direct current side caused by double frequency circulating current control, and improves the current and power quality of the MMC direct current side.
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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IPC IPC(8): H02M7/483H02M1/088
CPCH02M7/483H02M1/088
Inventor 邓富金喻强
Owner LIYANG RES INST OF SOUTHEAST UNIV