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A mmc type high voltage direct current transmission hvdc direct current side power supply system

A high-voltage direct current transmission and power supply system technology, applied in the direction of converting direct current power input to direct current power output, control/regulation systems, electrical components, etc., can solve the problems of difficult power supply for module units and difficult design of high-impedance transformers, etc.

Active Publication Date: 2017-11-28
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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  • A mmc type high voltage direct current transmission hvdc direct current side power supply system
  • A mmc type high voltage direct current transmission hvdc direct current side power supply system
  • A mmc type high voltage direct current transmission hvdc direct current side power supply system

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Embodiment

[0108] 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:

[0109] 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:

[0110]

[0111] Step 2. According to the rated current I obtained in step 1 S =577A, then determine the inductance L connected in the MMC type HVDC DC side power supply system S The inductance value L S and capacitance C 1 Capacitance C 1 , the specific formula is as follows:

[0112]

[0113] In formula (2), f is grid frequency, f=50Hz,

[0114]

[0115] At the same time, according to the determined rated current I in this system S The value selects the type of IGBT tube, and the type of IGBT tube meets the following con...

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Abstract

The invention discloses an MMC type high voltage direct current transmission HVDC DC side power supply system, which comprises 2 groups of HVDC modules respectively connected to both ends of the high voltage three-phase line, and 2 capacitors C1 are connected in parallel between the 2 groups of HVDC modules, each group of HVDC Each module includes 3 link module strings, each link module string includes 2 link modules connected in series in sequence, and 2 inductors Ls are connected in series between the 2 link modules, and there is a node between the 2 inductors Ls , one end of the unconnected inductance Ls of all link modules is connected together, and the three nodes in each HVDC module are sequentially connected to the high-voltage three-phase line. During the N+2 redundant operation of the module unit, the module unit is not easy to supply power because the high-impedance transformer is not easy to design due to price and volume restrictions.

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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Patent Type & Authority Patents(China)
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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