CN201994672U - Movable static synchronous compensator with compact structural design - Google Patents

Abstract

The utility model discloses a movable static synchronous compensator with compact structural design, wherein, the compensator has high compensating capacity and high regulation speed, adopts the compact structural design and a convenient transportation manner, and can be rapidly transferred, installed and put into operation in places that need reactive power emergently, so that the planning, the arrangement and the operation of a dynamic reactive power compensation device of a power network can be more flexible and effective. The movable static synchronous compensator comprises three function module containers with the same structures, assistant device containers and movable bases, wherein, the function module containers comprise single-phase converter chains and converter chain lightning protectors; the assistant device containers comprise control protection systems, water cooling systems and three-phase start-up circuits; and the movable bases comprise connection reactors, main circuit breakers and ground switches. The movable static synchronous compensator has the obvious advantages of high response speed, wide regulating range, low output harmonic content, compact design, mobility, small occupied area and the like.

Description

A kind of portable STATCOM of densification structural design

Technical field

The utility model belongs to the power system reactive power compensation technical field, is specifically related to a kind of portable STATCOM of densification structural design.

Background technology

Along with the continuous expansion of China's scale of power, when catastrophe failure takes place in receiving end network load area of concentration, can be difficult to recover owing to reactive voltage tenability deficiency, voltage, cause system stability destroyed, and then cause voltage collapse to cause large-area power-cuts.Power supply in receiving end electrical network configuration certain scale will help providing the dynamic electric voltage support, also help passage and keep higher stable nargin, improve the entire system maintenance level.The dynamic reactive compensation device conduct is dynamic reactive power configuration means flexibly, and effect is obvious aspect the raising voltage stability.

According to extra-high voltage grid standard achievement in research, in the future have many times big capacity ultra high voltage AC and DC circuits and gone into a large amount of electric power at the receiving end electrical network, when catastrophe failures such as extra high voltage line generation three-phase shortcircuit single-phase switch tripping, the receiving end line voltage often is difficult to recover, and needs cutting load just can make system keep stable.Therefore, for guaranteeing power grid security, avoid large-area power-cuts, need be at the receiving end electrical network, the dynamic reactive compensation device of direct current drop point accessory configuration one constant volume particularly is to improve receiving end electrical network dynamic electric voltage enabling capabilities.

STATCOM (STATCOM) preferably resolves the problems referred to above, it is a kind of novel static reacance dynamic compensating device, voltage source converter by connecting system in parallel constitutes, and the capacitive of its output or perceptual reactive current are continuous, adjustable and be independent of voltage with system's tie point.The reactive current output of SSTATCOM can be constant in very big change in voltage scope, stronger idle support still can be provided when low-voltage, and regulate continuously in can be from perception to the capacitive gamut, and it is little to have floor space, idle governing speed is fast, and output harmonic wave content is low, and connecting system does not have advantages such as resonance, in conjunction with the national conditions and the existing technology of China, development STATCOM should be the effective means that solves China's voltage stable problem.

Continuous development along with transmission system, reactive requirement and compensated position change in the future, other place may promptly suddenly increase the requirement of reactive power compensation, so be necessary to set up a kind of portable reactive compensation system, can shift fast, install and put into operation to the idle place of system's emergency.

The mode that portable STATCOM adopts the densification structural design, is convenient to transport can shift the infield fast in lifetime, the STATCOM device that can put into operation according to the system condition easy configuration.Owing to be subjected to the restriction of power device manufacture level and technology, realize jumbo STATCOM device, its main circuit structure will adopt cascade system; At present, portable STATCOM mainly comprises three kinds of structures: multiple inverter configuration, many level structure and chain structure.The transformer cost height of multiple inverter configuration, loss is big, floor space is big; Many level structure is difficult to realize the capacitance voltage Balance Control, and switching frequency increases, and switching loss increases, and efficient reduces; Therefore, fixed and portable STATCOM device mostly adopts chain structure.

The main circuit of chain type STATCOM is a kind of novel topological structure, the core of its main circuit is the voltage source converter of chain type (series connection of H bridge) structure, each all is an independently chain link mutually, be in series by N identical in structure chain link, each elementary cell is the single-phase bridge voltage source converter of exportable three level, and N chain link series connection can obtain the stepped voltage waveform of 2N+1 level.Chain structure STATCOM and output voltage waveforms are shown in Figure of description 1.

At present, the portable STATCOM device of 1 cover that Britain has put into operation, main circuit adopts chain structure, and the single-phase bridge voltage source converter that each chain link is made up of four GTO and fly-wheel diode constitutes, and is designed to modular unit and is contained in the container; But each link units need add chain link balance auxiliary circuit, needs accessory power supply to realize the balance of dc capacitor voltage, and structure is not compact, and area occupied is big.The domestic 1 jacket stationary type STATCOM device that has put into operation, main circuit also is a chain structure, each chain link is formed single-phase voltage source converter by four IGCT devices; But the IGCT device need add clamp circuit restriction anode inductance voltage, and the shared volume of these circuit and element is very big, and the parameter optimization difficulty is unfavorable for the densification design.Above-described STATCOM device, the main power device of its link units are GTO and IGCT, all need to increase some auxiliary circuits when carrying out the link units design, have increased the volume of single chain link, are unfavorable for the densification design, have increased the floor space of device.Chain type STATCOM device designing technique based on IGBT is still immature, does not see ripe topology layout technical scheme both at home and abroad as yet, and there are many technological difficulties in the Rational structure layout of its main element.

Summary of the invention

For solving the many technical problems that exist in above-mentioned components and parts rational deployment, the change of current chain densification structural design, the purpose of this utility model provides the portable STATCOM of a kind of rationally distributed, compact conformation, reliable operation, and this device has: response speed is fast, adjustable range is wide, output harmonic wave content is low, adopt the densification design, possess clear superiorities such as mobility and floor space be little.

For achieving the above object, the utility model adopts following technical scheme:

A kind of portable STATCOM of densification structural design, described portable STATCOM comprise functional module container, auxiliary equipment container, connect reactor, switch loop and movable pedestal; Its improvements are: described functional module container, auxiliary equipment container, connection reactor and switch loop are installed on the movable pedestal, described functional module container comprises single-phase change of current chain, described single-phase change of current chain is that the identical link unit of structure is composed in series, and described link units adopts the arrangement of S shape in the functional module container.

Wherein: being connected in series of described adjacent link unit: described link units is made up of H bridge voltage source converter, and described H bridge voltage source converter main circuit comprises H bridge circuit, discharge circuit, bypass circuit, cell controller, drive circuit and gets can power supply; Described H bridge circuit main power device is selected IGBT for use, described H bridge circuit is composed in parallel by two brachium pontis that are made of upper and lower pipe series connection respectively, two brachium pontis upper ends link to each other with the positive pole of dc capacitor by dc bus, two brachium pontis lower ends link to each other with the negative pole of dc capacitor by dc bus, the mid point of two brachium pontis is connected with adjacent link unit interchange end head and the tail respectively as the ac output end of this link units, realizes the series connection of adjacent link unit.

Wherein: described link units is provided with water-filled radiator, and water inlet is established in described water-filled radiator bottom, and top sets out the mouth of a river, and the water-filled radiator of described adjacent link unit connects by water pipe.

Wherein: described water-filled radiator is designed to the two independent water route, and two water inlets are established in the water-filled radiator bottom, and two delivery ports are established on top.

Wherein: described portable STATCOM comprises three structure identical functions module containers, each functional module container is a single-phase STATCOM, described cable is placed on the cable bearer, each functional module container connects into triangle by cable or copper bar, described each functional module container again by cable or copper bar and startup loop, be connected reactor and main circuit breaker is connected, 1 three-phase STATCOM of three common formations of single-phase STATCOM, three-phase STATCOM connecting system bus bar side in parallel.

Wherein: the water-cooling system of described auxiliary equipment container comprises cooling fan.

Wherein: described switch loop comprises main circuit breaker, isolating switch and earthed switch.

Owing to adopted above technical scheme, compared with the prior art, the beneficial effect that the utility model brings is as follows:

1) adopt the densification design, floor space is little

Described portable STATCOM, link units H bridge circuit main power device is selected IGBT for use, it need not complicated auxiliary circuit, be arranged on the water-filled radiator, capacitor is supported apart from reaching the shortest through optimal design and direct current in the layout installation site of IGBT, has the advantage little, compact in design that takes up room; That the IGBT driving power adopts is simple, reliably dc capacitor voltage get can mode, saved send circuit that can the mode complexity and send can transformer etc. equipment, the volume of chain link greatly reduces, and is beneficial to the densification design; The AC and DC busbar of link units adopts the noninductive composite laminate busbar of compact conformation, it is stacked together by insulating material to exchange busbar, DC master row, link to each other with the adjacent link module respectively, such design has reduced the volume of composite bus bar greatly, the space of saving power module is beneficial to the densification design of chain link.

2) possesses mobility

Adopt container and movable pedestal mounting means, be convenient to move and transportation; Can shift fast, install and put into operation in the place of the idle support of emergency, thereby make planning, layout and the operation of electrical network dynamic reactive compensation device flexible more, effective.

3) compensation capacity is big, and governing speed is fast

Link units H bridge circuit main power device is selected IGBT for use, makes described portable STATCOM, and compensation capacity is big, and governing speed is fast.

Description of drawings

Fig. 1 is chain structure STATCOM and output waveform figure.

Fig. 2 is portable STATCOM main circuit topological structure figure.

Fig. 3 is portable STATCOM floor plan.

Fig. 4 is the link units internal circuit diagram.

Fig. 5 is the link units layout.

Fig. 6 is a change of current chain layout in the container.

Reference numeral:

1-direct current capacitor, 2-H bridge circuit, 3-discharge circuit, 4-bypass circuit, 5-get energy power supply, 6-cell controller, 7-drive circuit, 8-alternating current-direct current busbar, 9-water-filled radiator, 10-functional module container, 11-auxiliary equipment container, 12-movable pedestal, 13-cooling fan, 14-connection reactor, 15-cable bearer, 16-isolating switch, 17-main circuit breaker;

Rs-STATCOM device starting resistance, Sa-A phase main circuit breaker, Sb-B phase main circuit breaker, Sc-C phase main circuit breaker, Spa-A phase starting resistance bypass breaker, Spb-B phase starting resistance bypass breaker, Spc-C phase starting resistance bypass breaker, 0.5X-connects reactor.

Embodiment

Below in conjunction with example the utility model is described in detail.

Embodiment 1:

The basic principle of portable STATCOM is exactly to be core with voltage source converter (VSC), it is energy-storage travelling wave tube that DC side adopts direct current capacitor 1, utilize turn-off device IGBT to convert dc voltage to the electrical network same frequency alternating voltage, and be connected in parallel on the electrical network by connecting reactor 14, suitably regulate AC side output voltage amplitude and phase place, perhaps directly control its ac-side current, just can make the device absorption or send the reactive current that meets the demands, realize the purpose of dynamic passive compensation.In order to form practical big capacity and satisfactory low harmonic wave, the topological structure of portable STATCOM main circuit adopts chain structure shown in Figure 2, mainly is made of three-phase change of current chain, connection reactor 14, starting resistance, main circuit breaker 17, isolating switch 16 etc.Every phase change of current chain is composed in series successively by a plurality of identical in structure H bridge voltages source converter, form the three-phase change of current chain that triangle connects by joining end to end of single-phase change of current chain then, again by cable or copper bar with the startup loop, be connected continuous connecting system 35kV bus bar side in parallel such as reactor 14, main circuit breaker 17.

Embodiment 2:

The container of auxiliary equipment described in the utility model 11 can go out a plurality of containers according to the requirements extend of functional module container 10; for example: control protection system container, water-cooling system container and startup loop container; wherein control the protection system container and be used to realize control, monitoring and protection functional module container 10; the working junction temperature that the water-cooling system container is used for security function module container 10 change of current chain power device IGBT is no more than maximum allowable junction temperature, starts the soft start that the loop container is used to realize functional module container 10.And the arranged mode of auxiliary equipment container 11 can be set according to actual conditions.

For being suitable for the needs of mobile engineering, convenient transportation, portable STATCOM device makes every effort to compact, attractive in appearance on structural design, comprise three functional module containers 10 and an auxiliary equipment container 11 in the present embodiment, and specifically provide the arrangement of functional module container 10, auxiliary equipment container 11, connection reactor 13, switch loop 12 and movable pedestal.All devices all is installed on container and the movable pedestal 12, and floor space is no more than with the capacity reactive power compensator as far as possible, and electric floor plan as shown in Figure 3; Comprise that mainly four containers and 12,4 containers of three movable pedestals are respectively 10, one auxiliary equipment containers 11 of three STATCOM functional module containers.The outlet cable is placed on the cable bearer 15, three functional module containers 10 are by cable or copper bar and be connected into triangle, again by high-tension cable or copper bar and startup loop, to be connected series connection such as reactor 14, main circuit breaker 17 continuous, three-phase STATCOM of common formation, three-phase STATCOM connecting system bus bar side in parallel.Relatively brief introduction of device overall appearance described in the utility model, wiring is simple.Container satisfies the requirement of road transport, and inner employing of device is flexible coupling, and in glissandoes such as junction employing rubber blanket, bullet pad, springs, to reduce the jerk in the transportation; Consider reinforcement simultaneously, make it to possess higher antitorque, tension, measuring body performance.Casing adopts heat-barrier material, can resist the influence of extraneous radiation; Internal container is provided with monitoring means such as temperature, humidity, smog and illumination, ventilation, drainage device; Be furnished with air-conditioning in the casing, air-conditioning adopts redundant configuration, has the function of heat radiation, dedusting, and camera and observation window are installed, the running status of convenient monitoring change of current chain; Arrange equipment such as connecting reactor 14, isolation switch, main circuit breaker 17, lightning arrester on the movable pedestal 12.

Embodiment 3:

Equipment mainly comprises single-phase change of current chain in the STATCOM functional module container 10.Every phase change of current chain is composed in series by a plurality of identical in structure chain link modular units, and each link units is to be made of the voltage source converter that the H bridge constitutes, and the H bridge is made up of many IGBT that have the inverse parallel diode, as shown in Figure 4.Mainly comprise direct current capacitor 1, H bridge circuit 2, discharge circuit 3, bypass circuit 4, get energy power supply 5, cell controller 6, drive circuit 7 etc.For change of current chain being installed in the narrow and small container in space, chain link power model unit need adopt the densification design, optimize its layout, the volume that compression link units volume and connection take, make the structure of link units possess little, the lightweight characteristics of volume, adopt topology layout figure as shown in Figure 5.Mainly comprise direct current capacitor 1, H bridge circuit 2, bypass circuit 4, get compositions such as energy power supply 5, alternating current-direct current busbar 8, water-filled radiator 9.

Embodiment 4:

Main power device is selected IGBT for use in the H bridge circuit 2 of link units, compares with the IGCT device, and IGBT need not complicated clamped circuit, need not boost voltage balancing circuitry and accessory power supply, and therefore selecting IGBT for use is that main power device reduces the volume that power device takies; And the IGBT device requires relatively low to driving power, control can given under the situation that main electricity powers on again, thereby can adopt and simply get the energy mode, get energy circuit and link units equipotential substantially, saved send can mode complexity circuit and send can transformer etc. equipment, the volume of link units greatly reduces, and is beneficial to the densification design; The direct current capacitor 1 that many groups are installed in parallel is arranged side by side in a side, links to each other with brachium pontis IGBT by DC master row; Two brachium pontis all adopt many IGBT to be arranged in parallel a side at direct current capacitor 1, and capacitor is supported apart from reaching the shortest through optimal design and direct current in the layout installation site of IGBT; AC and DC busbar 8 adopts the noninductive composite laminate busbar of compact conformation, it is stacked together by insulating material to exchange busbar, DC master row, link to each other with the adjacent link unit respectively, such design has reduced the volume of composite bus bar greatly, the space of saving power module is beneficial to the densification design of chain link; Driver is directly installed on the IGBT, and IGBT is installed on the radiator; For the heat of IGBT being opened, produce in the turn off process fully distributes, adopting water-cooled is main radiating mode, and each chain link no longer designs blower fan, air channel, reduces their shared spaces, reduces the chain link volume, compact conformation; Water-filled radiator 9 adopts the design of bottom water inlet top water outlet, is the two independent water route, and water inlet and delivery port design make things convenient for water route connection between the link units in a side of water-filled radiator 9, reduces to connect occupation space; The space of water-filled radiator 9 belows is used for installation unit controller 6, drive circuit 7, equipment such as getting can power supply 5, bypass circuit 4, make full use of the space of link units, the volume of link units is reduced greatly, be convenient to modularization, the densification design of link units.

Embodiment 5:

For making full use of space in the container, single-phase change of current chain is arranged as many rows, multilayer, multiple row mode in functional module container 10, as shown in Figure 6.Leave enough distances between row and row, as maintainer's passage and the female pipe of layout water inlet; Each row is arranged in parallel by the 5-10 row, per 1 row are arranged by vertical pile about 2-6 the link units, be fixed on the insulating support, the module outlet side adopts vertical electric connecting mode up and down, adopt S type electric connecting mode between row and the row, be about to functional module container 10 inner link modules from down and on-be together in series in order successively from top to down, make that the potential difference of adjacent link module is less, can dwindle the distance between the module, and it is simply clear to be electrically connected, and reduces to be electrically connected occupation space; Draw in container by wall bushing at the two ends of change of current chain, is connected to form the triangle wiring from beginning to end with two other single-phase change of current chain respectively, constitutes three-phase change of current chain; Top, the bottom of change of current chain are fixed by supporting insulator, also auxiliary supports will be installed in transportation, to strengthen constant intensity; The water route structure adopts the parallel way again of connecting earlier, the water pipe that is the same 2-6 that lists of a same row chain link module is connected in parallel on total female pipe after the series connection up and down successively again, the bottom is the female pipe of water inlet, the top is a main water outlet pipe, this kind connected mode needs water swivel quantity few, annexation is simple, and Potential distribution is distinct, and it is little to take up room; Select the composite high pressure insulating material of good corrosion resistance, electrical insulating property and construction technology in the change of current chain for use, reduce the air distance between link units, further compress the volume of change of current chain, satisfy the densification design of change of current chain.

Embodiment 6:

Major function in the auxiliary equipment container 11 is control, monitoring and the protection that realizes functional module container 10, and the capital equipment of auxiliary equipment container 11 comprises: control protection system, water-cooling system, three-phase start loop, cooling fan 13 etc.The control protection system detects STATCOM device running status, makes it satisfy designing requirement, when STATCOM device running status breaks down, it is shielded.Cooling system is the important component part of change of current chain, and the consumption heating of each components and parts on the converter valve is discharged into outside the functional module container 10, ensures that change of current chain power device working junction temperature is no more than maximum allowable junction temperature.This device adopts totally-enclosed pure water cooling system, mainly comprise the major cycle cooling circuit, the deionized water treatment loop, four parts of nitrogen stabilization pressure system and coolant and pipeline, water-air cooling mode is adopted in its secondary heat exchange, the heat sinking benefit height, reliable, and in big capacity STATCOM device, have cost advantage.Start the loop and comprise starting resistance and bypass breaker thereof, start-up circuit charges by the direct current capacitor of starting resistance to described device, the soft start function of implement device.

Embodiment 7:

S shape connected mode in the utility model refers to that specifically the chain link module is arranged as many rows, multilayer, multiple row mode in functional module container 10, as shown in Figure 6:

The connected mode of the same row's link units of change of current chain is in the described functional module container (10): the link units of the same row of same row is from going up down or series connection in order successively from top to down, the link units of same row's adjacent column, connect between the link units that is connected serially to the row tail by previous column and the link units of adjacent column with layer, the circuit structure of same row's adjacent column link units is formed S type connected mode;

Connected mode in the described functional module container (10) between the adjacent row of change of current chain is: the link units that described last row is connected to the last person is adjacent between the link units of row's same column with layer and connects.

The utility model is described according to specific exemplary embodiment herein.To carry out suitable replacement under the scope of the present utility model or revise will be conspicuous not breaking away to one skilled in the art.Exemplary embodiment only is illustrative, rather than to the restriction of scope of the present utility model, scope of the present utility model is by appended claim definition.

Claims (8)

1. the portable STATCOM of a densification structural design, described portable STATCOM comprise functional module container (10), auxiliary equipment container (11), connect reactor (14), switch loop and movable pedestal (12); It is characterized in that: described functional module container (10), auxiliary equipment container (11), connection reactor (14) and switch loop are installed on the movable pedestal (12), described functional module container (10) comprises single-phase change of current chain, described single-phase change of current chain is that the identical link unit of structure is composed in series, and described link units adopts the arrangement of S shape in functional module container (10).

2. the portable STATCOM of a kind of densification structural design as claimed in claim 1 is characterized in that:

The connected mode of the same row's link units of change of current chain is in the described functional module container (10): the link units of the same row of same row is from going up down or series connection in order successively from top to down, the link units of same row's adjacent column, connect between the link units that is connected serially to the row tail by previous column and the link units of adjacent column with layer, the circuit structure of same row's adjacent column link units is formed S type connected mode;

Connected mode in the described functional module container (10) between the adjacent row of change of current chain is: the link units that described last row is connected to the last person is adjacent between the link units of row's same column with layer and connects.

3. the portable STATCOM of a kind of densification structural design as claimed in claim 1, it is characterized in that being connected in series of described adjacent link unit: described link units is made up of H bridge voltage source converter, and described H bridge voltage source converter main circuit comprises H bridge circuit (2), discharge circuit (3), bypass circuit (4), cell controller (6), drive circuit (7) and gets energy power supply (5); Described H bridge circuit (2) main power device is selected IGBT for use, described H bridge circuit (2) is composed in parallel by two brachium pontis that are made of upper and lower pipe series connection respectively, two brachium pontis upper ends link to each other with the positive pole of dc capacitor by dc bus, two brachium pontis lower ends link to each other with the negative pole of dc capacitor by dc bus, the mid point of two brachium pontis is connected with adjacent link unit interchange end head and the tail respectively as the ac output end of this link units, realizes the series connection of adjacent link unit.

4. the portable STATCOM of a kind of densification structural design as claimed in claim 1, it is characterized in that: described link units is provided with water-filled radiator (9), water inlet is established in described water-filled radiator (9) bottom, top sets out the mouth of a river, and the water-filled radiator (9) of described adjacent link unit connects by water pipe.

5. the portable STATCOM of a kind of densification structural design as claimed in claim 4 is characterized in that described water-filled radiator (9) is designed to the two independent water route, and two water inlets are established in water-filled radiator (9) bottom, and two delivery ports are established on top.

6. the portable STATCOM of a kind of densification structural design as claimed in claim 1, it is characterized in that: described portable STATCOM comprises three structure identical functions module containers (10), each functional module container (10) is a single-phase STATCOM, described cable is placed on the cable bearer (15), each functional module container (10) connects into triangle by cable or copper bar, described each functional module container (10) is again by cable or copper bar and startup loop, connect the series connection of reactor (14) and main circuit breaker (17), 1 three-phase STATCOM of three common formations of single-phase STATCOM, three-phase STATCOM connecting system bus bar side in parallel.

7. the portable STATCOM of a kind of densification structural design as claimed in claim 1 is characterized in that: the water-cooling system of described auxiliary equipment container (11) comprises cooling fan (13).

8. the portable STATCOM of a kind of densification structural design as claimed in claim 1 is characterized in that: described switch loop comprises main circuit breaker (17), isolating switch (16) and earthed switch.

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