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A mmc circulating current suppression technology based on complementary coupling resonance

A complementary coupling and circulating current suppression technology, applied in the direction of output power conversion devices, electrical components, etc.

Inactive Publication Date: 2016-02-03
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • A mmc circulating current suppression technology based on complementary coupling resonance
  • A mmc circulating current suppression technology based on complementary coupling resonance
  • A mmc circulating current suppression technology based on complementary coupling resonance

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[0018] specific implementation plan

[0019] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] The MMC circuit structure after using the circulation suppression method introduced by the scheme in the present invention is as follows figure 2 shown. and figure 1 Compared with the original MMC circuit shown, it can be found that the modification of the circuit topology of this scheme is mainly to replace the original current-limiting inductance L0 on the bridge arm of the traditional MMC converter circuit with image 3 The complementary coupled resonant circuit shown. Since the main component of the circulating current is the second harmonic component, by adjusting the LC circuit on the secondary side of the coupled inductor, parallel resonance occurs when the second harmonic flows through, thereby effectively suppressing the second harmonic flowing on the bridge arm Wave. At the...

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Abstract

The invention discloses an MMC (modular multilevel converter) bridge arm circulating current suppression technology based on complemented coupling resonance. According to the characteristic that the key component in an MMC bridge arm circulating current is secondary harmonics, upper and lower bridge arms respectively utilize a coupling inductor to replace an original current-limiting inductor, the secondary sides of the coupling inductors of the upper and lower bridge arms are connected in parallel and then are connected in series with a capacitor, therefore, an LC resonance circuit of which the resonant frequency is a secondary fundamental frequency is formed, secondary harmonic components in the bridge arm current cannot normally circulate, and a suppression effect on the secondary circulating current on the bridge arms is effectively realized.

Description

technical field [0001] The present invention designs a method for suppressing circulating current of a modularized multilevel converter. The method is based on a complementary coupled resonant circuit. By adjusting parameters, the resonant frequency of the circuit is twice the frequency of the fundamental wave, thereby effectively controlling the second harmonic. The suppression belongs to the application field of power electronics in power systems. Background technique [0002] Modular multilevel converter (MMC) is a new type of multilevel voltage conversion circuit, which can superimpose and output very high voltage by cascading multiple sub-modules. Compared with the traditional multi-level topology, the modified topology has the characteristics of less output harmonics and high modularity, so it has broad application prospects in power systems. [0003] Compared with previous multilevel converters, MMC has many advantages, but it also brings some new problems. One of t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
Inventor 梅军郑建勇杜晓舟吉宇韩少华
Owner SOUTHEAST UNIV