CN104201690B - Distribution transformer integrated form cascade connection type static compensator - Google Patents
Distribution transformer integrated form cascade connection type static compensator Download PDFInfo
- Publication number
- CN104201690B CN104201690B CN201410356443.4A CN201410356443A CN104201690B CN 104201690 B CN104201690 B CN 104201690B CN 201410356443 A CN201410356443 A CN 201410356443A CN 104201690 B CN104201690 B CN 104201690B
- Authority
- CN
- China
- Prior art keywords
- distribution transformer
- connection type
- cascade connection
- type static
- compensation module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of distribution transformer integrated form cascade connection type static compensator, including distribution transformer, cascade connection type static compensation module, output filter and control platform, the center of the on high-tension side every phase winding of distribution transformer is provided with and connects tap as the decanting point compensating electric current, connect tap and connected the ac output end of cascade connection type static compensation module by output filter, the control input of cascade connection type static compensation module connects control platform, control platform to be used for gathering distribution transformer height, voltage and current information at low-pressure side and connection tap, trace command current signal is generated according to these information, the output utilizing trace command current signal to control cascade connection type static compensation module realizes compensating.Cascading multiple electrical level structure and distribution transformer are carried out integrated by the present invention, improve the capacity of distribution static compensator, improve the quality of power supply of distribution.
Description
Technical field
The present invention relates to power system reactive power compensation field, be specifically related to a kind of by distribution transformer and level
Connection chain type STATCOM (STATCOM, Static Synchronous Compensator) phase
Integrated integrated SVC.
Background technology
More conventional electrical distribution net reactive-load compensator (D-STATCOM) uses and directly carries out idle benefit in load side
Repaying, as it is shown in figure 1, electric pressure is low, install dispersion owing to accessing, compensation capacity is restricted,
Overall reactive compensation capacity utilization rate is the highest；And use carrying out in distribution network systems high-pressure side shown in Fig. 2
It is high that Large Copacity centralized compensation faces again access point voltage, and main circuit generally cannot or be difficult to directly and system
The problem being connected.
In order to improve the capacity of distribution network var compensation, reduce access point voltage, Patents (patent
Number: ZL2011 1 0095451.4) the DT-STATCOM technical scheme shown in Fig. 3 is proposed, to join
The tap of piezoelectric transformer is as the access point of static compensation device.The program reduces to a certain extent
Access point voltage, but static compensation module uses voltage-source type three-phase bridge PWM rectifier, adopts
By two level or three-level structure, still suffer from the following problem had much room for improvement:
1 single switch device is still subject to bigger switch stress, the resistance to setting-out to full-controlled switch device
Flat requirement is higher, static compensation device access point can not flexible configuration on a large scale, compensation capacity is limited；
2 inverter output voltage wave level numbers are less, and harmonic content is relatively big, grid-connected for realizing output
Need the high-order LCL filter that design is complicated；
3 three-phases are not independent, do not possess split-phase independence control ability, it is impossible to overcome Three-phase Power Systems not
The impact of balance；
4 modular implementation difficulties, are unfavorable for extension, and need to arrange resistance capaciting absorpting circuit.
Summary of the invention
The present invention proposes a kind of distribution transformer integrated form cascade connection type static compensator, is cascaded by employing
Type main circuit structure, from distribution transformer high-pressure side, centre cap injecting compensating electric current realizes idle benefit
Repay, both reduced access voltage, decrease concatenation unit number, increase again reactive compensation capacity.
Distribution transformer integrated form cascade connection type static compensator is static including distribution transformer, cascade connection type
Compensating module, output filter and control platform, the high-pressure side of distribution transformer connects power system,
The low-pressure side of distribution transformer connects load, and the center of the on high-tension side every phase winding of distribution transformer sets
It is equipped with the decanting point connecting tap as compensation electric current, connects tap and connect cascade by output filter
The ac output end of type static compensation module, the control input of cascade connection type static compensation module connects control
Platform processed, controls platform for gathering distribution transformer high and low pressure side and connecting voltage and the electricity of tap
Stream information, generates trace command current signal according to these voltage and current information, utilizes trace command
Current signal controls the output of cascade connection type static compensation module and realizes compensating.
Further, described cascade connection type static compensation module uses cascade chain structure to open up as main circuit
Flutter, the most all use multiple full bridge structure to be composed in series, between three-phase, use star or delta connection.
Further, described full bridge structure is 2H bridge.
Further, described output filter takes into full account that transformer connects leakage reactance, uses less filter
Ripple reactance realizes grid-connected.
Further, described control platform uses DSP+FPGA framework, gathers distribution transformer height
Pressure side voltage x current information and compensating module DC bus-bar voltage information, transform to even through COMPREHENSIVE CALCULATING
Connect and at tap, carry out instruction current tracking.
Technical scheme, relative to existing DT-STATCOM technology, has techniques below
Effect:
1 present invention is using cascade connection type chain structure as main circuit topology, compensating module output voltage and appearance
Amount can pass through swap modules quantity flexible configuration, it is easy to accomplish modularization, convenient extension；
The switch stress that 2 this programme Single switch pipes bear is less, expands the type selecting scope of device, has
It is beneficial to use higher switching frequency, simplifies the design of output filter further；
3 this programme can use independent direct current source, makes three-phase to be independently controlled, it is possible to overcome
Three-phase Power Systems is uneven；
4 static compensation modules use modularization Redundancy Design, and single power cell fault does not affect system
Overall work, improves the reliability of system；
5 this programme inverter output voltage level numbers are more, and waveform, closer to sine wave, passes through transformation
When device tap connects injection, transformer leakage reactance can be made full use of, reduce the volume of filter reactance.
Accompanying drawing explanation
Fig. 1 is the D-STATCOM technical scheme schematic diagram of existing low-pressure side dispersion compensation.
Fig. 2 is existing through connection transformer access distribution transformer high-pressure side scheme schematic diagram.
Fig. 3 is existing DT-STATCOM technical scheme schematic diagram.
Fig. 4 is distribution transformer integrated form cascade connection type static compensator overall structure schematic diagram of the present invention.
Fig. 5 is that cascade connection type compensating module of the present invention shows through L filtering access Y shape winding centre cap scheme
It is intended to.
Fig. 6 is that cascade connection type compensating module of the present invention accesses △ shape winding centre cap integrated programme.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically
Embodiment only in order to explain the present invention, is not intended to limit the present invention.Additionally, it is disclosed below
Just may be used as long as technical characteristic involved in each embodiment of the present invention does not constitutes conflict each other
To be mutually combined.
The distribution transformer integrated cascade connection type static compensator of the present invention, by distribution transformer
High voltage winding group switching centre arranges connection tap, cascade connection type static compensation module is connected in parallel with power distribution network,
Being integrally formed structure, realizes reactive-load compensation and utility power quality control.This invention overall structure such as Fig. 4
Shown in, mainly include centre cap distribution transformer, output filter, cascade connection type static compensation module
With control platform.
In the distribution transformer integrated form cascade connection type static compensator of the present invention, high for distribution transformer
Pressure side uses △ shape or Y connection mode, all center at every phase winding to arrange connection tap, this
Sample, STATCOM access point voltage reduces to original half.With 10KV/0.4KV distribution transformer it is
Example, sees Fig. 6, if high-pressure side uses △ shape wiring, access point voltage is the half of line voltage, only
There is 5KV；Seeing Fig. 5, if high-pressure side uses Y connection mode, access point voltage is line voltage
'sTimes, only about 3KV.
In the present invention program, static compensation module employing full bridge structure is as elementary cell, every by multiple
Elementary cell is sequentially connected in series and forms, and three-phase uses star or delta connection mode to be connected with each other: star
Shape wiring is every, and can to bear voltage mutually be phase voltage, and delta connection to bear voltage mutually be line voltage.
Although it is low that delta connection accesses voltage, but providing maximum to compensate electric current is star connectionTimes.?
In the case of grid-connected voltage is identical, use the cascade progression that the STATCOM of delta connection needs relatively
Many, it is considered to high-power switch device is relatively costly, so becoming originally to open rate, the present invention from unitary device
Main employing star connection is as main wiring mode.Cascaded stages is several according to access point electric pressure and employing
Switching device level determine.Full bridge structure can use the structure such as 2H bridge and 3H bridge, and the present invention is excellent
Choosing uses 2H bridge cascading topological structure, can effectively eliminate harmonic wave, make output voltage closer to just
String ripple, thus simplify the design of output filter.In the present invention, distribution transformer high-pressure side is mainly adopted
Using delta connection mode, access point voltage is 5KV, is designed with the IGBT of 1700V as opening
Close device, it is considered to enough safety allowances and the needs of Redundancy Design, use 7 grades of cascade systems, its
In 1 grade be redundancy structure.
The present invention program takes into full account transformer leakage reactance, uses less filter inductance to be filtered, tool
Body can use filter reactance device as output filter, owing to main circuit uses the side of multiple-unit cascade
Formula, it is simple to using high-frequency PWM control mode, devices switch frequency is higher, level number in output voltage
More, harmonic frequency is higher, easily filters.Further, this programme uses transformer center tap note
Enter to compensate electric current, it is considered to the leakage reactance of distribution transformer, the inductance of filter reactor can be effectively reduced
Value, reduces the volume of reactor.
The platform that controls of the present invention realizes the control to static compensation module and triggering.As shown in Figure 4,
Control platform and gather distribution transformer on high-tension side voltage USabc, electric current ISabc, the voltage U of low-pressure sideLabc、
Electric current ILabc, voltage U at tapIabc, electric current IIabc；In order to the electric capacity of inverter direct-flow side is carried out
Pressure and Control, control platform and also gather DC capacitor voltage Vdc, controlled by H bridge self-energy balance
Method realizes DC bus-bar voltage Pressure and Control.Control platform and mainly use DSP and FPGA architecture,
According to different utility power quality control requirements, the voltage of step down side, current information is utilized to calculate
Obtain practically necessary reactive power or harmonic current, it is considered to the amplitude of the electromagnetic coupled progress of disease and phase angle
Change, in conjunction with the voltage at high-pressure side and connection tap, current information, is calculated and connects tap
Reactive power or the command signal of reactive current.Further, since use the main electricity of multiple-unit cascade mode
Road topological structure, controls platform and individual-phase control or three-phase can also be used as required to coordinate to control,
The instruction current signal of correspondence is obtained under corresponding control strategy.Trace command current signal concrete
Algorithm is field, place known technology, and here is omitted.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention,
Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc.
With replacement and improvement etc., should be included within the scope of the present invention.
Claims (2)
1. distribution transformer integrated form cascade connection type static compensator, quiet including distribution transformer, cascade connection type
Only compensating module, output filter and control platform, the high-pressure side of distribution transformer connects power system,
The low-pressure side of distribution transformer connects load, and the center of the on high-tension side every phase winding of distribution transformer sets
It is equipped with the decanting point connecting tap as compensation electric current, connects tap and connect cascade by output filter
The ac output end of type static compensation module, the control input of cascade connection type static compensation module connects control
Platform processed, controls platform for gathering distribution transformer high and low pressure side and connecting voltage and the electricity of tap
Stream information, generates trace command current signal according to these voltage and current information, utilizes trace command
Current signal controls the output of cascade connection type static compensation module and realizes compensating；
Described cascade connection type static compensation module employing cascade chain structure is as main circuit topology, mutually the most equal
Use multiple full bridge structure to be composed in series, between three-phase, use star or triangle to connect；
Described full bridge structure is 2H bridge, and described output filter uses filter reactance device.
Distribution transformer integrated form cascade connection type static compensator the most according to claim 1, it is special
Levying and be, described control platform uses DSP+FPGA framework.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356443.4A CN104201690B (en) | 2014-07-24 | 2014-07-24 | Distribution transformer integrated form cascade connection type static compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410356443.4A CN104201690B (en) | 2014-07-24 | 2014-07-24 | Distribution transformer integrated form cascade connection type static compensator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104201690A CN104201690A (en) | 2014-12-10 |
| CN104201690B true CN104201690B (en) | 2016-08-31 |
Family
ID=52086943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410356443.4A Active CN104201690B (en) | 2014-07-24 | 2014-07-24 | Distribution transformer integrated form cascade connection type static compensator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104201690B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680452B (en) * | 2016-02-29 | 2019-01-25 | 中国科学院电工研究所 | A kind of flexible Loading voltage regulator of integrated flexible AC transmission equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6335613B1 (en) * | 2000-12-04 | 2002-01-01 | Abb T&D Technology Ltd. | Versatile power flow transformers for compensating power flow in a transmission line |
| CN102185321A (en) * | 2011-04-15 | 2011-09-14 | 华中科技大学 | Integrated static compensator of distribution transformer |
| CN203135454U (en) * | 2013-04-10 | 2013-08-14 | 黑龙江科技学院 | A cascaded static synchronous compensator |
-
2014
- 2014-07-24 CN CN201410356443.4A patent/CN104201690B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6335613B1 (en) * | 2000-12-04 | 2002-01-01 | Abb T&D Technology Ltd. | Versatile power flow transformers for compensating power flow in a transmission line |
| CN102185321A (en) * | 2011-04-15 | 2011-09-14 | 华中科技大学 | Integrated static compensator of distribution transformer |
| CN203135454U (en) * | 2013-04-10 | 2013-08-14 | 黑龙江科技学院 | A cascaded static synchronous compensator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104201690A (en) | 2014-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102075096B (en) | Fault tolerance design-based high-power electronic transformer | |
| CN104852583B (en) | A kind of more level DC transformers of High Frequency Link for mesolow DC distribution | |
| CN103516230A (en) | Bi-directional power flow controlled multi-level mutual balance solid state transformer and realization method thereof | |
| CN102214924B (en) | Feedforward decoupling control method based on three-phase two-arm tri-level active power quality compensator | |
| CN204103504U (en) | A kind of grid-connected photovoltaic system based on the access of mesohigh direct current | |
| CN102983584B (en) | A kind of THE UPFC for unbalanced system | |
| CN105897017B (en) | Three-phase line voltage cascades VIENNA converter | |
| CN102969877A (en) | LCL (Less Container Load) filter with serially-connected splitting capacitor and damping resistor and design method of LCL filter | |
| CN105932719A (en) | Cascading high-voltage large-capacity energy storage virtual synchronous machine system | |
| CN103066599A (en) | Three-phase three-wire system mixed type integrated power system electric energy quality regulator | |
| CN101574935B (en) | Module combined power quality conditioning system for tractive power supply network | |
| CN107370392A (en) | Towards the electric power electric transformer of mesohigh intelligent distribution network | |
| CN203491898U (en) | Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer | |
| CN104410063A (en) | Cascaded unified electric energy quality regulating system | |
| CN104795981A (en) | Current ripple active restraining method of DC-grid-connection-operation hybrid micro-grid bidirectional transducers | |
| CN102832815A (en) | Three-phase electric and electronic transformer based on multi-level multi-module cascade structure | |
| CN201887672U (en) | High-power power electronic transformer based on fault-tolerant design | |
| CN110854867A (en) | Electric energy quality comprehensive optimization system for electric energy substitution scene of low-voltage distribution network and control method thereof | |
| CN102820666B (en) | Three-phase power electronic transformer capable of balancing asymmetric load | |
| CN104852388B (en) | A kind of chain type SVG device with active power filtering function | |
| CN104767191B (en) | A kind of inverter earthed system | |
| CN202930956U (en) | Unified power flow controller used in unbalanced system | |
| CN211018279U (en) | Comprehensive optimization control device for electric energy quality of low-voltage distribution network | |
| CN202084941U (en) | Three-phase two-arm three-level active power quality compensator suitable for middle-and-high voltage system | |
| CN104201690B (en) | Distribution transformer integrated form cascade connection type static compensator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |