Interline power flow controller based on modular multi-level converter structure

A power flow controller and converter technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as insufficient research on IGBT series voltage equalization, restrictions on large-capacity IPFC applications, and difficulty in purchasing IGBT devices. High switching frequency, improved reliability, avoiding the effect of withdrawal and input

Active Publication Date: 2013-03-13
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical difficulties of IGBT series connection with turn-off devices are mainly manifested in: affected by technology monopoly, it is difficult to purchase IGBT devices with self-limiting short-circuit current characteristics, and the control technology of IGBT series voltage equalization is not theoretically studied deeply enough
In order to reduce the output harmonics of the device, a higher switching frequency is required, so the operating loss of the device is relatively large, which limits the application of large-capacity IPFC

Method used

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  • Interline power flow controller based on modular multi-level converter structure
  • Interline power flow controller based on modular multi-level converter structure
  • Interline power flow controller based on modular multi-level converter structure

Examples

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Embodiment 1

[0039] This embodiment provides a switchable static compensator based on a modular multilevel converter structure such as figure 2 As shown, it includes a static synchronous compensator 1 and a static synchronous series compensator 2; the static synchronous compensator 1 includes a converter 7 and a parallel transformer 8; the static synchronous series compensator 2 includes a converter 9 and a series transformer 10;

[0040] The converter 7 is composed of three-phase six bridge arms, and the six bridge arms have the same structure, and each bridge arm includes a reactor and N (N is a natural number) sub-modules with the same structure; after the sub-modules are cascaded, they pass The reactor is connected to the starting circuit 5; specifically, the midpoint of the half-bridge structure of the sub-module and the emitter of the lower tube IGBT are respectively used as the lead-out ends of the sub-module, which are sequentially cascaded with the front and rear modules, and then...

Embodiment 2

[0049] This embodiment is basically the same as Embodiment 1, but the difference is:

[0050] The positions of the reactors in the inverter 7 and the inverter 9 are different. The reactor in this embodiment is connected in series on the positive and negative busbar sides of the converter 7 and the converter 9, such as image 3 shown. It is used to suppress the output harmonics of the converter device.

[0051] Specifically, the converter 7 is composed of three-phase six bridge arms, and each bridge arm includes a reactor and N submodules with the same structure; the submodules of each bridge arm are cascaded and one end is connected to the starting circuit 5 The reactor at the other end is connected in series with the reactors of the other two bridge arms to form the positive and negative busbars of the converter 7 .

[0052] The converter 9 is composed of three-phase six bridge arms, and each bridge arm includes a reactor and M submodules with the same structure; the submo...

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Abstract

The invention relates to an interline power flow controller based on a modular multi-level converter structure. The interline power flow controller comprises a static synchronous compensator (1) and a static synchronous series compensator (2), the static synchronous compensator (1) comprises a converter (7) and a parallel transformer (8), the static synchronous series compensator (2) comprises a converter (9) and a series transformer (10), the converter (7) is connected into a power transmission line I in parallel through the parallel transformer (8), the converter (9) is connected in a power transmission line II in series through the series transformer (10), a unified power flow controller comprises a by-pass switch (4), and the by-pass switch (4) is connected with the series transformer (10) in parallel. The interline power flow controller avoids the technical difficulty of device series connection, facilitates split-phase control and modular design, can bypass a trouble unit through the redundancy technology, improves operational reliability of a device, and is low in device switching frequency and small in device operation loss.

Description

technical field [0001] The invention relates to an inter-line power flow controller in the field of flexible AC power transmission, in particular to an inter-line power flow controller based on a modular multilevel converter structure. Background technique [0002] The inter-line power flow controller (IPFC) is the latest development of power electronics technology and modern control technology to achieve flexible and fast control of the parameters and network structure of the AC multi-line transmission system. Its characteristic is that its flexibility can adapt to the requirements of complex systems for a series of compensation and power flow control. It can complete independent comprehensive compensation of a single line, and can also carry out active power transmission among multiple lines. [0003] The IPFC device can be regarded as a static synchronous compensator (STATCOM) device and a static synchronous series compensator (SSSC) device connected in parallel on the D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/01H02J3/18
CPCY02E40/18Y02E40/16Y02E40/10Y02E40/40
Inventor 王宇红王轩王柯吴倩戴朝波张宇
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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