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Movable-type static synchronous compensator with compact structure design

A static synchronous compensation and structural design technology, applied in the direction of reactive power adjustment/elimination/compensation, cooling/ventilation/heating transformation, flexible AC transmission system, etc. Problems such as occupying an area and increasing the volume of a single chain link can achieve the effects of compact design, compact layout, and clear potential distribution

Active Publication Date: 2011-07-27
CHINA EPRI SCIENCE & TECHNOLOGY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A set of fixed STATCOM devices that have been put into operation in China has a chain structure as the main circuit, and each chain link consists of four IGCT devices to form a single-phase voltage source converter; however, the IGCT devices need an additional clamping circuit to limit the anode inductance voltage. These circuits and components occupy a large volume, and parameter optimization is difficult, which is not conducive to compact design
For the STATCOM device mentioned above, the main power devices of the chain link unit are GTO and IGCT. When designing the chain link unit, some auxiliary circuits need to be added, which increases the volume of a single chain link, which is not conducive to compact design and increases The footprint of the device
The design technology of IGBT-based chained STATCOM devices is still immature, and mature structural layout technical solutions have not been seen at home and abroad, and there are many technical difficulties in the reasonable structural layout of its main components

Method used

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  • Movable-type static synchronous compensator with compact structure design
  • Movable-type static synchronous compensator with compact structure design
  • Movable-type static synchronous compensator with compact structure design

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Experimental program
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Effect test

Embodiment 1

[0041] The basic principle of the mobile STATCOM is to take the voltage source converter (VSC) as the core, use the DC capacitor as the energy storage element on the DC side, and use the turn-off device IGBT to convert the DC side voltage into an AC voltage with the same frequency as the power grid, and By connecting the reactor in parallel with the power grid, properly adjusting the amplitude and phase of the output voltage on the AC side, or directly controlling the current on the AC side, the device can absorb or send out reactive current that meets the requirements, and realize dynamic reactive power compensation. Purpose. In order to form a practical large capacity and meet the requirements of low harmonics, the topology of the mobile STATCOM main circuit adopts figure 2 The chain structure shown is mainly composed of three-phase commutation chain, connecting reactor, starting resistor, main circuit breaker, isolating switch and so on. Each phase commutation chain is co...

Embodiment 2

[0043] The auxiliary equipment container 11 described in the present invention can be expanded into multiple containers according to the requirements of the functional module container 10, such as: control and protection system container, water cooling system container and starting circuit container, wherein the control and protection system container is used to implement the functional module container 10 control, detection and protection, the water cooling system container is used to ensure that the working junction temperature of the converter chain power device IGBT in the functional module container 10 does not exceed the maximum allowable junction temperature, and the starting circuit container is used to realize the soft start of the functional module container 10. And the arrangement of auxiliary equipment containers 11 can be set according to actual conditions.

[0044] In order to meet the needs of mobile engineering and facilitate transportation, the mobile STATCOM d...

Embodiment 3

[0046] The equipment in the STATCOM functional module container 10 mainly includes a single-phase commutation chain. Each phase commutation chain is composed of multiple chain link module units with the same structure in series. Each chain link unit is composed of a voltage source converter composed of an H bridge. The H bridge is composed of multiple IGBTs with antiparallel diodes. ,Such as Figure 4 shown. It mainly includes DC capacitor 1, H bridge circuit 2, discharge circuit 3, bypass circuit 4, energy harvesting power supply 5, unit controller 6, drive circuit 7, etc. In order to install the converter chain in a container with a small space, the chain link power module unit needs to adopt a compact design, optimize its layout, reduce the volume of the chain link unit and the volume occupied by the connection, so that the structure of the chain link unit has a small size and low weight. light features, employing such as Figure 5 The structural layout diagram shown. I...

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Abstract

The invention discloses a movable-type static synchronous compensator with a compact structure design. The compensator has high compensation capacity and rapid adjusting speed and compact structure, is convenient for transportation, and can be rapidly transferred, installed and put into operation at the urgent place needs reactive power support, thus the planning, the arrangement and the operation of a dynamic reactive power compensation device of a power grid are more flexible and effective. The movable-type static synchronous compensator comprises three functional module containers with the same structure, an auxiliary equipment container and a movable base, wherein, the functional module container comprises a single-phase converter chain and a converter chain arrester; the auxiliary equipment container comprises a control protective system, a water-cooling system and a three-phase starting loop; and the movable base comprises a connection reactor, a main breaker, an isolation switch and an earthed switch. The compensator provided by the invention has the obvious advantages of rapid response speed, wide adjustment application, low harmonic output content, adoption of compact design, mobility, less occupation area and the like.

Description

technical field [0001] The invention belongs to the technical field of reactive power compensation in electric power systems, and in particular relates to a mobile static synchronous compensator with a compact structure design. Background technique [0002] With the continuous expansion of the scale of my country's power grid, when a serious fault occurs in the load-concentrated area of ​​the receiving-end power grid, the system stability will be destroyed due to insufficient reactive power and voltage support capacity and difficult voltage recovery, which will cause voltage collapse and cause large-scale power outages. Configuring a certain scale of power supply in the receiving end grid will help provide dynamic voltage support, and will also help maintain a high stability margin for the channel and improve the overall stability of the system. As a flexible dynamic reactive power configuration means, the dynamic reactive power compensation device plays an obvious role in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H05K7/20
CPCY02E40/16Y02E40/10
Inventor 王轩杨武帝王承民李志麒王柯左永仁袁蒙韩天绪周庆鹏常忠武守远滕乐天熊超英
Owner CHINA EPRI SCIENCE & TECHNOLOGY CO LTD
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