A Modular Multilevel Converter and Its Submodule Topology
A modular multi-level, topology technology, applied in the direction of high-efficiency power electronic conversion, AC power input conversion to DC power output, electrical components, etc., can solve the problem of high loss of sub-modules, reduce conduction loss, shorten switching Transient process, the effect of reducing switching losses
Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH
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[0007] In view of the above defects or improvement needs of the prior art, the present invention provides a modular multilevel converter and its sub-module topology, thereby solving the existing technical problem of high loss of sub-modules based on Si switching devices
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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0033] Such as figure 2 Shown is a sub-module topology of a modular multilevel converter provided by an embodiment of the present invention, including: a left half-bridge module, a right half-bridge module, and a connecting circuit;
[0034]Among them, the left half-bridge module includes: a first Si IGBT T1, a second Si IGBT T2, a first Si diode D1, a second Si diode D2, a first SiC MOSFET M1...
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The invention discloses a modular multilevel converter and its sub-module topology, including left and right half-bridges connected to circuits, wherein the left half-bridge includes T1, T2, D1, D2, M1, DM1 and C1, T1, T2, and M1 are connected in antiparallel with D1, D2, and DM1 respectively, M1 is connected in series with the capacitor and the positive electrode of the capacitor is connected to the drain of M1, the collector of T1 is connected to the source of M1, and the emitter of T2 is connected to the negative electrode of the capacitor. The right half bridge includes T3, T4, D3, D4, DM2, M2, and C2. T3, T4, and M2 are connected in antiparallel with D3, D4, and DM2 respectively. M2 is connected in series with the capacitor and the positive pole of the capacitor is connected to the drain of M2. The collector of T3 is connected to M2. Source, T4 emitter is connected with capacitor negative. The left half-bridge is connected to the right half-bridge through a connecting circuit. The topological structure of the present invention has the ability to actively output four levels, and the MMC system based on the topological structure can realize DC fault ride-through and voltage boosting operation.
Description
technical field [0001] The invention belongs to the field of modular multilevel converter topology, more specifically, relates to a new high-efficiency modular multilevel converter based on SiCMOSFET and Si IGBT with output negative level and DC fault ride-through capability and its submodules Topology. Background technique [0002] The Voltage Source Converter High Voltage Direct Current (VSC-HVDC) system based on Voltage Source Converter is compared with the traditional Line Commutated Converter High Voltage Direct Current (LCC- HVDC) has many advantages, such as: the active and reactive power of the converter can be independently controlled; the damping and stability of the AC transmission system are improved, it can be used as a black start power supply, the output voltage has less harmonic content, and the filter volume is smaller. Small. Compared with traditional two-level and three-level converters, Modular Multilevel Converter (MMC) has low switching loss, modular ...
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IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0054H02M1/007Y02B70/10
Inventor 徐晨林磊胡凯何佳璐
Owner HUAZHONG UNIV OF SCI & TECH