Inductive modular multilevel converter of bridge arm reactors

A modular multi-level, inverter technology, applied in high-efficiency power electronic conversion, output power conversion devices, conversion of AC power input to DC power output, etc., can solve the problem of consuming large reactive power and modularizing more. Level converter capacity reduction and other issues, to achieve the effects of volume reduction, loss reduction, and volume reduction

Inactive Publication Date: 2017-05-31
TSINGHUA UNIV
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Problems solved by technology

[0003] However, when the modular multilevel converter supplies power to the passive system, its equivalent reactance on the AC side is equivalent to the internal reactance of the power supply. During operation, it will consume a large amount of reactive power. Therefore, if it can be reduced If the equivalent reactance of the AC side is used, the capacity of the modular multilevel converter will be reduced when the same power load is supplied.

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  • Inductive modular multilevel converter of bridge arm reactors
  • Inductive modular multilevel converter of bridge arm reactors
  • Inductive modular multilevel converter of bridge arm reactors

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Embodiment Construction

[0018] The modularized multilevel converter with bridge arm reactance and mutual inductance proposed by the present invention has a schematic circuit diagram as figure 1 As shown, it includes the first commutation arm, the second commutation arm, the third commutation arm, the fourth commutation arm, the fifth commutation arm, the sixth commutation arm, the first inductance, the first inductance, the second Inductance, third inductance, fourth inductance, fifth inductance and sixth inductance; the positive terminals of the first, third and fifth commutation arms are connected together as bridge arm reactance band The DC positive terminal of the modular multilevel converter with mutual inductance; the negative terminals of the second, fourth and sixth commutation arms are connected together as a bridge arm reactance modular multi-level converter with mutual inductance The DC negative terminal of the flat converter; the negative terminal of the first commutation arm and the firs...

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Abstract

The invention relates to an inductive modular multilevel converter of bridge arm reactors and belongs to the field of power conversion. The modular multilevel converter comprises three phase units, and each phase unit comprises a sub-module set (SMs) and one bridge arm reactor (L); each sub-module set is formed by serially connecting multiple sub-modules, one end of each sub-module set is connected with the corresponding bridge arm reactor, the other end of each sub-module set is connected with a direct-current side positive pole or negative pole of an MMC, magnetic fluxes generated by common-mode components in upper and lower bridge arm currents in an iron core are superposed, differential-mode components in the upper and lower bridge arm currents are manually offset, accordingly upper bridge reactance and lower bridge reactance are superposed in the direct-current side, and the upper bridge reactance and the lower bridge reactance are mutually offset in the alternating-current side. Therefore, when the alternating-current side of the MMC is connected with a passive load, internal reactance of the MMC is reduced, and reactive power provided by the MCM is reduced.

Description

technical field [0001] The invention relates to a modular multilevel converter with bridge arm reactance and mutual inductance, belonging to the technical field of power conversion. Background technique [0002] Since the topology of the modular multilevel converter was proposed, it has received widespread attention. It adopts a modular design, which is less difficult in engineering technology, and the voltage level is easy to expand. Using multilevel technology, its AC side voltage The distortion is small, so that the AC filter can be omitted. Therefore, the modular multilevel converter has been widely used in flexible DC transmission. When the modular multilevel converter is connected to the power grid, its bridge arm reactor has three functions: 1. For the DC side, the reactors of the upper and lower bridge arms are connected in series to limit the The rising rate of the fault current; 2. For the AC side, the reactors of the upper and lower bridge arms are connected in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00
CPCH02M7/00H02M1/0048H02M1/0067Y02B70/10
Inventor 郭高朋宋强刘文华
Owner TSINGHUA UNIV
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