CN205921393U - Low capacity middling pressure SVG based on H bridge - Google Patents
Low capacity middling pressure SVG based on H bridge Download PDFInfo
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- CN205921393U CN205921393U CN201620970341.6U CN201620970341U CN205921393U CN 205921393 U CN205921393 U CN 205921393U CN 201620970341 U CN201620970341 U CN 201620970341U CN 205921393 U CN205921393 U CN 205921393U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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Abstract
The utility model provides one kind can be improved the device's operational safety and the low capacity middling pressure SVG based on H bridge that reliability, compact structure, dilatation make things convenient for, reduce the SVG cost, comprise the part that steps down, actuating section, power subtotal control section, the part that steps down adopts a dry -type reducing transformer, and the transformer high -pressure side is connected with the electric wire netting, and the transformer low voltage side is connected with the actuating section, the actuating section comprises connection reactor and the charging device who establishes ties, the parallelly connected ac contactor normally open contact who has by control section control in charging device both ends, the power part comprises power unit, opening and turn -offing through high power switching device among the drive signal control power unit, it adopts the wiring of star type to correspond triphase power unit, control section comprises with display element the main control unit, and the main control unit passes through collection system voltage, current signal, sends the operation that drive signal controlled each power unit after the computing, monitors the power unit operation conditions simultaneously.
Description
Technical field
This utility model is related to press static reacance generator in a kind of low capacity based on h bridge, is widely used in all kinds of electricity
Force system.
Background technology
Continue with national economy, quickly develop, electric load is also growing, electric network composition becomes increasingly huge
Greatly, complicated, power system it is also proposed higher requirement to the quality of power supply, developed into now from the former compensation capacitive reactive power that only needs
Also need compensation for inductive reactive power not needing only compensate for capacitive, and can continuously adjust.It is in particular in: on the one hand require negative
Lotus peak period can provide more capacitive reactive power, to meet the reactive requirement of industrial and mining establishment；On the one hand provide perception again no
Work(, to balance the capacitive reactive power that the light hours bring because of electrical network it is ensured that the voltage of system will not be too high.In addition with modern electric
The development of electronic technology, the power electronic equipment such as rectifying installation, frequency conversion equipment, Switching Power Supply commonly used, to power system
Bring huge harmonic pollution；Especially electric locomotive, ac arc furnace, rolling mill and other large-scale semiconductor variable flow dresses
The impact load such as put increasingly to be widely applied, the impact idle component brought therewith and higher harmonic components are directly led
Cause fluctuation and the flickering of system voltage, cause serious pollution to electrical network.
Traditional svc can only compensate capacitive or inductive reactive power；Rely on systematic parameter, be easy to occur resonance to amplify phenomenon, lead
Cause potential safety hazard；And it is slow to there is response speed, running wastage is high, the shortcomings of floor space is big.
Svg is most advanced compensation technique product on our times, and it no longer adopts jumbo capacitor, connects reactance
Device, but the conversion of reactive-load compensation is realized by the HF switch of device for high-power power electronic, in response speed, stablize electrical network
Voltage, reduction system loss, increase transmittability, the transient voltage limit that improves, reduction harmonic wave and minimizing floor space etc. are in many ways
Face has more superior performance.At present adopt, in middle pressure reactive-load compensation field svg, the chain structure that h bridge connects, it each
It is mutually all to be in series by multiple structure identical h bridge power units, three are linked adopts Y-connection, then through linked reactor
It is connected with electrical network.In chain type svg, power cell DC bus capacitor is independent of one another, and the shunt loss of each chain link, switch damage
Consumption, modulation ratio and pulse delay etc. have differences again, and leading to each power cell to exist, DC capacitor voltage is unbalanced asks
Topic.DC capacitor voltage unbalance can bring many detrimental effects, and the imbalance of capacitance voltage can make the humorous of svg output voltage
Ripple aberration rate increases, and when its degree of unbalancedness is larger, the capacitance voltage of some chain links can be higher, has influence on the safety fortune of device
OK, system crash can be led to when serious.
Therefore for the Middle Voltage that load or burden without work is not very big, improve cost, reduce operational reliability.
Content of the invention
The purpose of this utility model is to provide a kind of synthesis control realizing the improvement of medium voltage side electric energy using step-down transformer
Device processed, presses static reacance generator in the low capacity based on h bridge, can improve safety in operation and the reliability of this device,
Compact conformation, dilatation is convenient, reduces svg cost.
Static reacance generator should be pressed, by the blood pressure lowering part of corresponding three-phase, actuating section, work(in low capacity based on h bridge
Rate part and control section composition；
Each blood pressure lowering part is made up of a dry type step-down transformer, and step-down transformer high-pressure side connects with electrical network, blood pressure lowering
Step down side connects with actuating section；
Each actuating section is made up of the linked reactor connected and charging device, and the end that enters of described linked reactor connects
In step-down transformer low-pressure side, described charging device two ends are parallel with the A.C. contactor normally opened contact being controlled by control section；
Each power section is made up of power cell, after linked reactor series winding, by step-down transformer and electrical network phase
Even, opening and turning off of high-power switch device in power cell is controlled by drive signal；The power cell of corresponding three-phase is adopted
Use star-connection；
Control section is made up of with display unit main control unit, and main control unit passes through acquisition system voltage, current signal, meter
Calculation sends drive signal to control the operation of each power cell after processing, and monitors power cell operation conditions simultaneously；Display unit
Main display master control unit data, realizes real-time monitoring and the monitoring of information.
In every phase, power cell is multiple and is parallel-connection structure.
Described high-power switch device is igbt or igct.
The beneficial effects of the utility model are:
1st, power cell accesses step-down transformer low-pressure side by linked reactor；High voltage side of transformer accesses electrical network, by
Low in power section input voltage, power cell does not need to connect；With the cascaded high-voltage static reacance generator phase based on h bridge
Specific power unit does not need direct current all to press, and power cell quantity is few, decreases the probability of fault appearance, reduces cost, improves
Safety in operation, reliability.
2nd, power cell adopts modular construction, is easy to scale manufacture；In every phase, power cell adopts parallel-connection structure, knot
Structure is compact, and dilatation is very convenient.
3rd, compared with the cascaded high-voltage static reacance generator based on h bridge, the main control unit of control section is easily achieved
Direct Current Control method, fast response time, control accuracy is high.
4th, line voltage and power cell AC voltage act at linked reactor two ends, thus producing expected compensation
Electric current.
Brief description
Fig. 1 is circuit theory diagrams of the present utility model；
Fig. 2 is topology diagram of the present utility model.
Specific embodiment
As shown in Figure 1 and Figure 2, static reacance generator should be pressed in the low capacity based on h bridge, by the decompression portion of corresponding three-phase
Divide, actuating section, power section and control section form；
Each blood pressure lowering part is made up of a dry type step-down transformer, step-down transformer high-pressure side pass through be spaced chopper,
Main transformer is connected with electrical network, and step-down transformer low-pressure side (1kv) is connected with actuating section；
Each actuating section is made up of the linked reactor connected and charging device, and the end that enters of described linked reactor connects
In step-down transformer low-pressure side, described charging device two ends are parallel with the A.C. contactor normally opened contact being controlled by control section；
Each power section is formed by by the power cell that optical fiber is connected with control section output, and power cell passes through simultaneously
After the charging device of connection and ac contactor contact and linked reactor series winding, it is connected with electrical network by step-down transformer, passes through
The drive signal being sent by control section controls opening and turning off of high-power switch device in power cell, described high-power opens
Close device and adopt igbt, igct or other wholly-controled device may also be employed.The power cell of corresponding three-phase adopts star-connection, often
In phase, power cell can be multiple and be parallel-connection structure.
Control section is made up of with display unit main control unit, and main control unit mainly realizes the closed loop control of svg, quick guarantor
Shield and display, communication and remote monitoring function.Main control unit passes through system ct, svg ct and the system of corresponding 6kv/10kv bus
Pt acquisition system voltage, current signal, calculating sends drive signal to control operation (triggering and the envelope of each power cell after processing
Lock igbt), each power cell is carried out with pwm waveform control, by adjusting amplitude and the phase of power cell AC output voltage
Position, or directly control its ac-side current, so that middle pressure static reacance generator is absorbed or send the reactive current of system needs,
Realize the purpose of dynamic passive compensation.Monitor power cell operation conditions simultaneously, when power cell fault is detected, can be first
Time realizes the protection to equipment, and fault message is fed back to main control unit.Display unit mainly shows master control unit data,
Realize real-time monitoring and the monitoring of information.
Display unit has keyboard, touches dual input function, and monitoring, display system running status, are that a personal-machine connects
Mouthful.
Claims (3)
1. press static reacance generator in a kind of low capacity based on h bridge, it is characterized in that: by the blood pressure lowering part of corresponding three-phase, open
Dynamic part, power section and control section composition；
Each blood pressure lowering part is made up of a dry type step-down transformer, and step-down transformer high-pressure side connects with electrical network, downconverter
Device low-pressure side connects with actuating section；
Each actuating section is made up of the linked reactor connected and charging device, and the end that enters of described linked reactor is connected to fall
Pressure transformer low-pressure side, described charging device two ends are parallel with the A.C. contactor normally opened contact being controlled by control section；
Each power section is made up of power cell, after linked reactor series winding, is connected with electrical network by step-down transformer, leads to
In signal of overdriving control power cell, high-power switch device opening and turning off；The power cell of corresponding three-phase adopts star-like
Wiring；
Control section is made up of with display unit main control unit, and main control unit passes through acquisition system voltage, current signal, at calculating
Send drive signal after reason to control the operation of each power cell, monitor power cell operation conditions simultaneously；Display unit is main
Display master control unit data, realizes real-time monitoring and the monitoring of information.
2. press static reacance generator in the low capacity based on h bridge according to claim 1, it is characterized in that: work(in every phase
Rate unit is multiple and is parallel-connection structure.
3. press static reacance generator in the low capacity based on h bridge according to claim 1, it is characterized in that: described big work(
Rate switching device is igbt or igct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620970341.6U CN205921393U (en) | 2016-08-29 | 2016-08-29 | Low capacity middling pressure SVG based on H bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620970341.6U CN205921393U (en) | 2016-08-29 | 2016-08-29 | Low capacity middling pressure SVG based on H bridge |
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| Publication Number | Publication Date |
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| CN205921393U true CN205921393U (en) | 2017-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422372A (en) * | 2020-12-22 | 2021-09-21 | 北京信息科技大学 | Integrated charging station for transformer substation and control method |
-
2016
- 2016-08-29 CN CN201620970341.6U patent/CN205921393U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422372A (en) * | 2020-12-22 | 2021-09-21 | 北京信息科技大学 | Integrated charging station for transformer substation and control method |
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