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MMC dual sub-module topology with DC-side fault self-clearing capability

A twin module, self-clearing technology, applied in the direction of converting AC power input to DC power output, power transmission AC network, output power conversion device, etc., can solve the problem of high cost, achieve fault current removal, good versatility, and guarantee The effect of safe and reliable operation

Inactive Publication Date: 2019-11-08
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the number of power devices required by the sub-module, FBSM requires 4 power devices for each output level, and the cost is obviously higher; while SDSM requires 2.5 power devices, and the middle power device needs to withstand twice the capacitance Voltage

Method used

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  • MMC dual sub-module topology with DC-side fault self-clearing capability
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  • MMC dual sub-module topology with DC-side fault self-clearing capability

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are explanations rather than limitations of the present invention.

[0020] refer to figure 1 , an MMC twin-submodule topology with DC-side fault self-clearing capability, including a connection circuit, a reverse blocking circuit, and two half-bridge submodules (HBSM) with the same structure.

[0021] The two half-bridge sub-modules are connected in series through the connection circuit, the reverse blocking circuit is connected in parallel with the two half-bridge sub-modules, and the reverse blocking circuit is connected to the input terminal.

[0022] Half-bridge sub-module HBSM 1 Including an insulated gate bipolar transistor T 1 , Insulated Gate Bipolar Transistor T 2 , Diode D 1 , Diode D 2 and capacitance C 1 ;

[0023] Diode D 1 Insulated Gate Bipolar Transistor with T 1 in parallel, diode D 1 The negative pole of the insulated gate bip...

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Abstract

The present invention discloses an MMC dual sub-module topology with a DC-side fault self-clearing capability. Two half-bridge modules are connected in series by a connecting circuit, the input end ofthe output end of the dual sub-module are connected in parallel with a reverse blocking circuit. The connecting circuit in the dual sub-module is formed by connecting an insulated gate bipolar transistor and a diode in anti-parallel mode; and the reverse blocking circuit is formed by connecting a capacitor and a diode in series. When a fault occurs on the DC side, the reverse blocking circuit hasan effect for clearing a fault current, the dual sub-module has good universality, can be used for hybrid sub-module topology to allow the converter to have a DC fault clearing capability so as to ensure the safe and reliable operation of the MMC-HVDC system.

Description

technical field [0001] The invention belongs to the field of modular multilevel converter (MMC) sub-module topology structure in flexible DC transmission, and in particular relates to an MMC twin-sub-module topology with DC side fault self-clearing capability. Background technique [0002] In recent years, with the rapid development of distributed energy sources such as wind energy and solar energy, high-voltage direct current transmission (MMC-HVDC) based on modular multilevel converters has been widely used. Compared with two-level or three-level voltage source converters, MMC has the advantages of low switching frequency, high waveform quality, and high fault tolerance rate. At present, the main research direction of MMC includes the topology of the converter and its sub-modules, system control strategy, capacitor voltage equalization strategy, circulation suppression strategy and fault protection, among which fault protection plays a key role in the safe and reliable ope...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02M7/5387H02M1/32H02J3/36
CPCH02J3/36H02M1/32H02M7/483H02M7/53871H02M1/325Y02E60/60
Inventor 张祝祥张忠德贾立新杨立霞王毅翟志豪朱耿超齐亚周
Owner XI AN JIAOTONG UNIV
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