Novel modularized multilevel converter for inhibiting capacitor voltage fluctuation and control method thereof
A modular multi-level, capacitive voltage technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems of high replacement, inconvenient cost, etc., to reduce the capacitance capacity, Increased Utilization Rate, Ease of Understanding and Implementation
Active Publication Date: 2019-06-07
LIYANG RES INST OF SOUTHEAST UNIV +1
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This brings higher cost and inconvenience to the maintenance and replacement of the diverter valve
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Embodiment 1
[0035] Embodiment 1: as figure 1 As shown, a modular multilevel converter that suppresses capacitor voltage fluctuations, the multilevel converter includes the same independent DC-side power supply 1.1 and 1.2 for each phase, a new sub-module 1.4, and a bridge arm inductor 1.6, 1.7 and energy storage capacitor 1.5; each phase is connected with the same load resistance 1.8 and load inductance 1.9 at the output of the AC side and the midpoint of the DC side; the converter includes two identical upper and lower bridge arms 1.10 and 1.11, each The bridge arm is composed of N identical new-type sub-modules 1.4 in series, where the number of N is determined by design indicators such as the number of output levels, and the upper and lower bridge arms are connected by the same two bridge arm inductances 1.6 and 1.7 in each phase. Each new sub-module has the same topology in each phase, and the three phases are connected through a shared energy storage capacitor 1.5. The topology stru...
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The invention relates to a novel modularized multilevel converter for inhibiting capacitor voltage fluctuation and a control method thereof. The scheme of the novel modularized multilevel converter for inhibiting capacitor voltage fluctuation has the advantages of high efficiency, small output alternating voltage harmonic wave, high modularization and the like, shows an important engineering application prospect in high-voltage high-power systems, and is gradually popularized and applied to the fields of renewable energy grid connection, motor drive, rail transportation and the like. Accordingto novel modularized multilevel converter (MMC) for inhibiting the capacitor voltage fluctuation and the control method, the same output voltage characteristic as a traditional three-phase modularized multilevel converter (MMC) can be obtained, the low-frequency voltage fluctuation of an energy storage capacitor of a submodule under different output frequencies and output currents can be eliminated, the capacity and spare quantity of the energy storage capacitor is reduced, and further the volume occupied by a converter valve and the converter is effectively reduced. The capacitor voltage fluctuation characteristic of the submodule without the low-frequency pulse component cannot be realized by an existing three-phase modularized multilevel converter (MMC).
Description
technical field [0001] The invention relates to a new topology of a three-phase modular multilevel converter and its sub-modules and a control method thereof, and belongs to the technical field of multilevel power electronic converters. Background technique [0002] Compared with the traditional two-level and three-level converters, the modular multilevel converter (MMC) has the characteristics of high efficiency, small output AC voltage harmonics, and high modularity. It has been demonstrated in high-voltage and high-power systems With its important engineering application prospects, it is being gradually promoted and applied in renewable energy grid connection, motor drive, rail transit and other fields. [0003] The sub-modules of each phase of the traditional three-phase MMC bridge arm operate independently, ignoring the influence of circulating currents. The upper bridge arm (lower bridge arm) of each phase needs to bear the DC current of the phase and half of the outpu...
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Inventor 邓富金吕泳庆王青松程明
Owner LIYANG RES INST OF SOUTHEAST UNIV