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HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter

A modular multi-level converter technology, applied in the field of HVDC and UPFC systems, can solve the problems of non-centralized management and control, low utilization rate of equipment, repeated investment in construction, etc., to improve utilization rate, increase device capacity, Ease of centralized management and control

Active Publication Date: 2013-03-27
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In common practical projects, flexible direct current transmission devices and UPFC are often constructed and operated independently, which causes problems such as repeated investment in construction, high cost, low utilization rate of equipment, and non-centralized management and control.

Method used

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  • HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter
  • HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter
  • HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on modularized multi-level converter

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Embodiment 1

[0043] This embodiment provides an HVDC and UPFC system based on a modular multilevel converter, and its topology is as follows image 3 As shown, it includes a converter device 1, a converter device 2, a converter device 11, a grounding circuit 3, a grounding circuit 12 and a DC transmission line 13;

[0044] One end of the converter device 1 is connected in series with the power grid, and the other end is connected in parallel with the grounding circuit 3; both ends of the grounding circuit 3 are divided into at least two branches, one of which is connected to the converter device 2 and then connected to the power grid to form a A group of unified power flow controllers UPFC; the second branch is connected to the grid through the DC transmission line 13 and the converter device 11 to form a group of flexible direct current transmission HVDC; the DC transmission line 13 and the converter device 11 is connected in parallel with ground capacitor 12.

[0045] Among them, each d...

Embodiment 2

[0056] This embodiment is basically the same as Embodiment 1, but the difference lies in:

[0057] In order to control the connection and exit of the converter device 2 in this embodiment, a bypass switch 4 is connected in parallel at both ends of the transformer 10 in this embodiment, as Image 6 shown.

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Abstract

The invention provides an HVDC (high voltage direct current controller) and UPFC (unified power flow controller) system based on a modularized multi-level converter. The HVDC and UPFC system comprises converting devices (1, 2 and 11), grounding circuits (3 and 12) and a direct current transmission line (13). The UPFC is formed by the converting device (1) and the converting device (2). The HVDC is formed by the converting device (1) and converting device (11). The HVDC and the UPFC shares one converting device, so that cost and investment for engineering construction are saved, equipment utilization rate is improved, concentrated management and control are facilitated. The converting devices use the topological structure of the modularized multi-level converter, so that technical difficulty in component serial connection is avoided, split-phase control and modularization are facilitated, fault units can be bypassed through redundancy, operation stability of the devices is improved, on and off frequency of components is low, and device operation loss is low.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an HVDC and UPFC system based on a modular multilevel converter. Background technique [0002] Under the new situation of rapid development of distributed power generation, renewable energy, and smart grid technology, flexible DC transmission technology provides a new way to make up for the shortcomings of traditional high-voltage DC transmission technology. Traditional high-voltage direct current transmission using semi-controlled device thyristors requires a reactive power compensation device on the AC side, and a very powerful power supply on the inverter side for active inversion, otherwise commutation failure will occur. Flexible DC transmission uses a voltage source converter based on turn-off devices, which has the ability to shut off the current, and uses PWM technology for passive inversion. There is no requirement for the capacity of the receiving end system, which solv...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M7/797H02J3/46
CPCY02E60/60
Inventor 王轩赵刚刘慧文闫殳裔宋晓通刘隽
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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