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MMC type high voltage DC power transmission (HVDC) DC side power supply system

A technology for high-voltage DC power transmission and power supply system, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, electrical components, etc.

Active Publication Date: 2015-10-07
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of MMC type high-voltage direct current transmission HVDC DC side power supply system, solve the MMC type HVDC that exists in the prior art when realizing the N+2 redundant operation of the module unit due to the high impedance transformer due to the price and volume The problem that the module unit is not easy to supply power due to the limitation of difficult design

Method used

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  • MMC type high voltage DC power transmission (HVDC) DC side power supply system
  • MMC type high voltage DC power transmission (HVDC) DC side power supply system
  • MMC type high voltage DC power transmission (HVDC) DC side power supply system

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Embodiment

[0109] The calculation of the relevant parameters of the MMC type high-voltage direct current transmission HVDC direct current side power supply system is as follows:

[0110] Step 1. First, according to the system line voltage U of the MMC HVDC DC side power supply system ab =10kV and deliver maximum power S Lmax =10MVA, determine the rated current I of the HVDC module 8 S , rated current I S The selection of is according to the formula:

[0111] I s = S L max / 3 U a b / 3 = 577 A - - - ( 1 )

[0112] Step 2. According to the rated ...

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Abstract

The invention provides an MCC type high voltage DC power transmission (HVDC) DC side power supply system, comprising two groups of HVDC modules which are connected to the two ends of a high voltage three phase wire; two capacitors C1 are connected in parallel between the two groups of HVDC modules; each group of the HVDC module comprises three link module strings; each group of the link module strings comprises two link modules which are connected in series; two inductors L are connected in series between the two links modules; a node is positioned between the two inductors L; the ends of the link modules which are not connected to the inductors L are connected together; and three nodes in each HVDC module are connected to the high voltage three phase wire in series. The MMC type high voltage DC power transmission (HVDC) DC side power supply system solves the problem that the MMC type HVDC is not easily designed and thus the unit is not easily powered because of the limitation on the price and the volume of the high resistance transformer in the process of realizing the N+2 redundancy operation of the module unit.

Description

technical field [0001] The invention belongs to the technical field of electric energy quality control, and in particular relates to an MMC type high voltage direct current transmission HVDC direct current side power supply system. Background technique [0002] As the grid voltage connected to MMC high-voltage direct current transmission (HVDC) continues to increase, the low-cost and high-reliability power supply of modular units has become a great challenge in the design of MMC modular units. Using the switching power supply to directly obtain energy from the DC capacitor of the module unit can reduce the requirements on the voltage withstand capability of the switching power supply, thereby reducing the size and cost of the power supply. [0003] The existing MMC-type HVDC modular unit power supply technology is mainly divided into: low-voltage AC power supply and high-voltage DC power supply. The low-voltage AC power supply technology supplies power to the module unit on...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M3/335
CPCY02E60/60
Inventor 杨波张静刚曾光李金刚粟忠来杨勇
Owner XIAN UNIV OF TECH
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