CN104065067A - Stepless active power balance and reactive power compensation governance method in low pressure transformer area - Google Patents
Stepless active power balance and reactive power compensation governance method in low pressure transformer area Download PDFInfo
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- 230000006872 improvement Effects 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
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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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- 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
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
A stepless active power balance and reactive power compensation governance method in a low pressure transformer area is characterized in that an outlet electric energy quality governing device is installed at a low-pressure outlet end of a transformer, a sub-circuit electric energy quality governing device is installed in front of a branch load, and with the stepless reactive compensation governance method in the low pressure transformer area, voltage of a user is stabilized, and the sub-circuit line loss is reduced.
Description
Technical field
The invention belongs to power quality controlling field, low-voltage platform area, particularly relate to the stepless active balance reactive power compensation in a kind of low-voltage platform area improvement method.
Background technology
Current low-voltage platform area, mainly refers to 10KV/400V power supply, the basic mode of connection: high pressure is delta connection, and low pressure is Y type, and its quality of power supply mainly contains three indexs: is power supply reliability, and is rate of qualified voltage, and is voltage harmonic aberration rate.The time that power supply reliability is described power supply accounts for the ratio of total time, and by generating, transmission of electricity department determines, the load condition in Yu Tai district is irrelevant, therefore for low-voltage platform area, mainly contains rate of qualified voltage and voltage harmonic aberration rate.And power supply unit is only examined the rate of qualified voltage of transformer low voltage output, not to not terminal voltage examination, and user is in end, there is a segment distance between from transformer to user, be generally tens to hundreds of rice, there is a voltage difference from the transformer port of export to user side, there is a voltage drop, as excessive in drop, can cause a result: the voltage of power supply unit power supply is qualified, but user side voltage is underproof, cause user's complaint.And voltage is defective, be mainly user side brownout, therefore solve user side brownout problem, be to reduce the basic reason of complaining.The object of the invention is just in order to address the above problem.
Summary of the invention
The object of patent of the present invention is the design stepless active balance reactive power compensation in a kind of low-voltage platform area improvement method, to solve the problems such as low-voltage platform area user side brownout, the loss of platform district be excessive.
The object of the present invention is achieved like this: the stepless active balance reactive power compensation in a kind of low-voltage platform area improvement method, it is characterized by: at the port of export of transformer low voltage, installation outlet end power quality controlling device, described port of export power quality controlling device comprises port of export power quality controlling device controller, and the long-range and branch road short-range communication module, stepless reactive power generator SVG, the harmonic filter APF that are connected with port of export power quality controlling device controller are respectively set; Branch road power quality controlling device is installed before branch road load, described branch road power quality controlling device comprises branch road power quality controlling device controller, and the stepless reactive power generator SVG of branch road short-range communication module, branch road, the branch road harmonic filter APF that are connected with branch road power quality controlling device controller are respectively set; Port of export power quality controlling device is by public telecommunications network or dedicated communications network, and realization is docked with data management system; By power-frequency communication of electric or carrier communication or short-distance wireless communication, realize be arranged on branch road on communicating by letter between the power quality controlling device of user side; And the active power balance that regulates and controls transformer load regulates or transformer load reactive power compensation or the filtering of transformer load harmonic current; Branch road power quality controlling device, by power-frequency communication of electric or carrier communication or short-distance wireless communication, is realized communicating by letter between port of export power quality controlling device; And the active power balance that regulates and controls branch road load regulates or the reactive power compensation of branch road load or the filtering of branch road load harmonic current;
the method that realizes active power balance adjusting and the stepless compensation of reactive power is:press the general principle of active balance, as mutually larger than B in A phase active power, between A, B phase, access capacitor C ab, can produce two effects: one is that A, B phase reactive power can increase simultaneously, and a part of active power of A phase can be transferred to B phase, be that A phase active power reduces, B phase active power increases, and the rest may be inferred mutually for other; Reactive power compensation is arbitrary reactive power of lacking mutually, the corresponding phase reactive power of corresponding compensation, both can carry out the stepless balance adjustment of active power with SVG, can carry out again the stepless compensation of reactive power, the best active power balance effect that the equipment that reaches allows and the best effects of reactive power compensation simultaneously;
realize harmonic current filtering administer method be,detect the harmonic current of test point, produce the electric current reverse with harmonic current direction, amplitude is identical by APF, inject test point by inductance, offset with harmonic current, thus harmonic carcellation electric current.
multiple branch road transformers, each branch road is installed a branch road power quality controlling device.
branch road power quality controlling device infield at the transformer port of export to branch road user load bifurcation or load center of gravity place.
port of export power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd..
branch road power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd.
Port of export power quality controlling device is designated hereinafter simply as port of export device.Branch road power quality controlling device is designated hereinafter simply as branching unit.
Take the present invention of above measure to have following benefit:
1, stablize user's voltage and reduced branch road line loss.Because the transformer port of export has a segment distance conventionally to user load point, be generally tens meters to hundreds of rice, as the laod unbalance of POL or power factor low, on zero line, can produce very large electric current, the voltage at POL place can reduce a lot, as carried out herein reactive power compensation and active load balance adjustment, can be by current reduction on zero line, reduced thus branch road line loss, the voltage of POL also can raise, and has met user's requirement.
2, improve transformer service efficiency and safety, reduce transformer loss.Active power regulation balance and reactive power are after overcompensation, and the service efficiency of transformer is improved, and its fail safe is also guaranteed, and after neutral line current reduces, transformer loss has also obtained reduction.
3, the reactive power in platform district is backflowed very little.Because carrying out reactive power compensation at branch road, each branch road POL power factor reaches 1 substantially, and therefore whole district idle backflows very littlely, and line loss is further reduced.
4, the parameter of each branch road POL, except monitoring the each parameter of transformer, can also directly be monitored, as voltage, electric current, power factor etc. in backstage.Branch road power quality controlling device, by power-frequency communication of electric or carrier communication or short-range wireless communication module, send port of export power quality controlling device by relevant parameter, then send data management system, and the information that therefore backstage is understood is more comprehensive;
5, harmonic current filter effect is better.The harmonic current of load is limited in branch road, on transformer without impact.Because carrying out harmonic management at branch road, harmonic current is without transformer, and therefore branch road harmonic current does not affect transformer.As all filterings of the harmonic current of branch road, port of export power quality controlling device can also continue filtering, ensures the filtering of Liao Tai district harmonic current.
6, operation cost is low.Because branch road is to complete by frequency communication or carrier communication, therefore only need a remote channel, just can realize total data passback data management system, operation cost is lower.
Port of export device medium-long range communication function, by public telecommunications network, as GPRS or CDMA or special electric power communication network, realization is communicated by letter with data management system, data management system all operations of device of control and monitor console district in real time.
Port of export device passes through power-frequency communication of electric
,carrier communication or short-range wireless communication module, realization is communicated by letter with branching unit, controls the operation of branching unit or the data of receiving branch device.
Branching unit is by power-frequency communication of electric, carrier communication or short-range wireless communication module, and realization is communicated by letter with port of export device, realizes transfer of data each other.
In port of export device and branching unit, process load balance and reactive power compensation, filter function, use active device, include active power filter APF, static reacance generator SVG, SVG is used for providing the stepless reactive power of transient state to regulate and active power balance regulates, and APF is for filtering harmonic wave, and this two part can isolated operation, also can complete by a part, capacity can be selected by being suitable for the principle of saving according to load capacity simultaneously.
Port of export power quality controlling device medium-long range communication function, by public telecommunications network, as GPRS or CDMA or special electric power communication network, realization is communicated by letter with data management system, can require to use different communication protocol according to difference, as State Grid Corporation of China's company standard: Q/GDW 376.1-2009 " power consumer power information acquisition system communication protocol Part I: main website and acquisition terminal communication protocol " or the company standard Q/CSG 12101.8-2008 of China Nanfang Grid Co., Ltd " marketing automation system loading office terminal, distribution transformer monitoring and metering terminal and low pressure meter-copy collector communication protocol ".Concrete function is shown in respective protocol regulation.
In port of export power quality controlling device, communicate by letter with branch road power quality controlling device with power-frequency communication of electric, carrier communication or the realization of square distance wireless communication.According to different communication channels, can use different communication protocol, as MODBUS agreement or custom protocol.
The present invention is described in further detail in conjunction with the accompanying drawings and embodiments more below.
Brief description of the drawings
Accompanying drawing 1 is that the winding diagram of methodological function module is administered in the stepless active balance reactive power compensation in a kind of low-voltage platform area.Wherein: be connected to a port of export power quality controlling device at the port of export, be connected to branch road power quality controlling device in each branch road load place, a branch road is installed one.
Accompanying drawing 2 is port of export power quality controlling device functional-block diagrams of the present invention, and the connecting relation of each function has been described in square frame.
Accompanying drawing 3 is branch road power quality controlling device functional-block diagrams of the present invention, and the connecting relation of each function has been described in square frame.
Accompanying drawing 4 is the concrete device parameters that use in the port of export power quality controlling device of patent working example of the present invention.
Accompanying drawing 5 is the concrete device parameters that use in the branch road power quality controlling device of patent working example of the present invention.
The invention will be further described in conjunction with the accompanying drawings and embodiments more below.
Embodiment
Accompanying drawing 1 is that the winding diagram of methodological function module is administered in the stepless active balance reactive power compensation in a kind of low-voltage platform area.
In accompanying drawing 1, port of export device is arranged on the transformer low voltage port of export, main balance, reactive power compensation and the filtering etc. of being responsible for Three-Phase Transformer active load, communicate by letter with back-end data treatment system and realize by public telecommunications network or dedicated communications network, communicate by letter with branching unit with power-frequency communication of electric, carrier communication or the realization of square distance wireless communication.
Branching unit installation site is generally to starting to connect user or load center of gravity place at the transformer low voltage port of export, generally have tens to hundreds of rice, balance, reactive power compensation and the filtering etc. of three-phase active load after main responsible installation place, communicate by letter with port of export device with power-frequency communication of electric, carrier communication or the realization of square distance wireless communication.
Accompanying drawing 2 is port of export power quality controlling device functional-block diagrams of the present invention, and the connecting relation of each function has been described in square frame.The wherein long-range and branch road short-range communication module of port of export power quality controlling device controller control work, realizes and the communicating by letter and the communication of branching unit of data management system at a distance; The stepless reactive power generator SVG of port of export power quality controlling device controller control, realizes the stepless idle adjusting of transformer and meritorious stepless balance adjustment; Port of export power quality controlling device controller control harmonic filter APF, realizes the filtering of transformer harmonic current.
Accompanying drawing 3 is branch road power quality controlling device functional-block diagrams of the present invention, and the connecting relation of each function has been described in square frame.Wherein branch road power quality controlling device controller control branch road short-range communication module, realize with port of export device communicate by letter; The stepless reactive power generator SVG of branch road power quality controlling device controller control branch road, realizes the stepless idle adjusting of branch road and meritorious stepless balance adjustment; Branch road power quality controlling device controller control branch road harmonic filter APF, realizes the filtering of branch road harmonic current.
Accompanying drawing 4 is the concrete device parameters that use in the port of export power quality controlling device of patent working example of the present invention.The transformer that this example uses is 630KVA, be divided into two outlets, two branch roads are installed selected wire diameter and are all arranged by 315KVA, get identical value, using long-range and short haul connection pattern is respectively GPRS communication pattern and power-frequency communication of electric pattern, realizes and the communicating by letter and the communication of branching unit of data management system at a distance; The communication protocol that patent working example of the present invention is used is State Grid Corporation of China's company standard: Q/GDW 376.1-2009 " power consumer power information acquisition system communication protocol Part I: main website and acquisition terminal communication protocol "; In port of export power quality controlling device, communicate by letter with branch road power quality controlling device with power-frequency communication of electric, use communication protocol is MODBUS agreement.Port of export power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd., this controller carries GPRS and frequency communication module, realize and the communicating by letter and the communication of branching unit of remote data management system, controller is also realized by 485 buses and miscellaneous equipment interconnected.What stepless reactive power generator SVG used is the enhancement mode reacance generator that Shenzhen City Shenghong Electric Co., Ltd. produces, power is 140Kvar, 415V, 3 phase 4 lines, model is Sinexcel 140 ASVG 4L/ML, realizes stepless idle adjusting and meritorious stepless balance adjustment; The use of harmonic filter APF be Beijing guide Bei Er Semiconductor Converting Technology Co., Ltd produce APF, model is XDAPF3L-380/100, every phase current 100A, realizes the filtering of harmonic current.
Accompanying drawing 5 is the concrete device parameters that use in the branch road power quality controlling device of patent working example of the present invention.This example has two branch roads, and two branch road parameters are all identical.Using short haul connection pattern is power-frequency communication of electric pattern, and realization is communicated by letter with port of export device; Branch road power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd., this controller carries frequency communication module, realization is communicated by letter with port of export device, and controller also passes through the interconnected of 485 buses realizations and miscellaneous equipment.What stepless reactive power generator SVG used is the enhancement mode reacance generator that Shenzhen City Shenghong Electric Co., Ltd. produces, power is 140Kvar, 415V, 3 phase 4 lines, model is Sinexcel 140 ASVG 4L/ML, realizes stepless idle adjusting and meritorious stepless balance adjustment; The use of harmonic filter APF be Beijing guide Bei Er Semiconductor Converting Technology Co., Ltd produce APF, model is XDAPF3L-380/100, every phase current 100A, realizes the filtering of harmonic current.
This example actual motion effect is more satisfactory, the first branch road user bifurcation is to approximately 200 meters of the distances of transformer, the second approximately 180 meters of branch road distances, approximately 0.5 Europe/KM of zero line resistance, therefore approximately (200/1000) * 0.5=0.1 Europe of the first branch road zero line resistance, the second branch road zero line resistance is (180/1000) * 0.5=0.09 Europe approximately.From backstage and actual detect all explanations, transformer outlet voltage is about 230V, the first branching unit place voltage is between 200-220, the second branching unit place voltage is between 202-223, the transformer port of export and branching unit place power factor are essentially 1, test point harmonic current aberration rate is less than 15%, all meets user's requirement.As whole devices exits, the first branch road and the second branching unit place voltage all have the 165V of being less than phenomenon.Operational effect has illustrated the validity of this method.
Claims (5)
1. the stepless active balance reactive power compensation in a low-voltage platform area improvement method, it is characterized by: at the port of export of transformer low voltage, installation outlet end power quality controlling device, described port of export power quality controlling device comprises port of export power quality controlling device controller, and the long-range and branch road short-range communication module, stepless reactive power generator SVG, the harmonic filter APF that are connected with port of export power quality controlling device controller are respectively set; Branch road power quality controlling device is installed before branch road load, described branch road power quality controlling device comprises branch road power quality controlling device controller, and the branch road short-range communication module, stepless reactive power generator SVG, the harmonic filter APF that are connected with branch road power quality controlling device controller are respectively set; Branch road power quality controlling device is installed before branch road load, and the stepless reactive power generator SVG of the branch road short-range communication module, the branch road that are connected with branch road power quality controlling device respectively, branch road harmonic filter APF are set; Port of export power quality controlling device is by public telecommunications network or dedicated communications network, and realization is docked with data management system; By power-frequency communication of electric or carrier communication or short-distance wireless communication, realize be arranged on branch road on communicating by letter between the power quality controlling device of user side; And the active power balance that regulates and controls transformer load regulates or transformer load reactive power compensation or the filtering of transformer load harmonic current; Branch road power quality controlling device, by power-frequency communication of electric or carrier communication or short-distance wireless communication, is realized communicating by letter between port of export power quality controlling device; And the active power balance that regulates and controls branch road load regulates or the reactive power compensation of branch road load or the filtering of branch road load harmonic current;
the method that realizes active power balance adjusting and the stepless compensation of reactive power is:press the general principle of active balance, as mutually larger than B in A phase active power, between A, B phase, access capacitor C ab, can produce two effects: one is that A, B phase reactive power can increase simultaneously, and a part of active power of A phase can be transferred to B phase, be that A phase active power reduces, B phase active power increases, and the rest may be inferred mutually for other; Reactive power compensation is arbitrary reactive power of lacking mutually, the corresponding phase reactive power of corresponding compensation, both can carry out the stepless balance adjustment of active power with SVG, can carry out again the stepless compensation of reactive power, the best active power balance effect that the equipment that reaches allows and the best effects of reactive power compensation simultaneously;
realize harmonic current filtering administer method be,detect the harmonic current of test point, produce the electric current reverse with harmonic current direction, amplitude is identical by APF, inject test point by inductance, offset with harmonic current, thus harmonic carcellation electric current.
2. the stepless active balance reactive power compensation in a kind of low-voltage platform area according to claim 1 improvement method, is characterized by: it is characterized by:
multiple branch road transformers, each branch road is installed a branch road power quality controlling device.
3. the stepless active balance reactive power compensation in a kind of low-voltage platform area according to claim 1 improvement method, is characterized by:
branch road power quality controlling device infield at the transformer port of export to branch road user load bifurcation or load center of gravity place.
4. the stepless active balance reactive power compensation in a kind of low-voltage platform area according to claim 1 improvement method, is characterized by:
port of export power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd..
5. the stepless active balance reactive power compensation in a kind of low-voltage platform area according to claim 1 improvement method, is characterized by:
branch road power quality controlling device controller uses the JKWN/H type controller of Beihai Shenlan Science and Technology Development Co., Ltd..
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| CN108461022A (en) * | 2017-02-20 | 2018-08-28 | 上海华坤电器有限公司 | A kind of power quality demo platform and its operation method |
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Application publication date: 20140924 |