CN104868475B - Electricity quality comprehensive control apparatus for low-voltage distribution network - Google Patents

Electricity quality comprehensive control apparatus for low-voltage distribution network Download PDF

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Publication number
CN104868475B
CN104868475B CN201510262363.7A CN201510262363A CN104868475B CN 104868475 B CN104868475 B CN 104868475B CN 201510262363 A CN201510262363 A CN 201510262363A CN 104868475 B CN104868475 B CN 104868475B
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CN
China
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module
voltage
low
control
distribution network
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CN201510262363.7A
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Chinese (zh)
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CN104868475A (en
Inventor
吴国兵
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广州开能电气实业有限公司
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Publication of CN104868475A publication Critical patent/CN104868475A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The invention discloses a comprehensive electricity quality control apparatus for a low-voltage distribution network. The comprehensive electricity quality control apparatus comprises a control module, a voltage adjusting module and a reactive compensation module, wherein the control module respectively controls the voltage adjusting module and the reactive compensation module, the input lines of the low-voltage distribution network are connected with the output lines of the low-voltage distribution network through an overvoltage adjusting module and the reactive compensation module, and the voltage adjusting module is a voltage bidirectional adjusting module. Unstable voltage due to voltage fluctuation is effectively prevented by employing voltage compensation graded and bidirectional adjustment and the intelligent time-delay function of a composite switch, and current impact of a conventional contactor switching is reduced by a composite switch in a reactive compensation module. The system loss is minimized, and the safety of the apparatus is guaranteed. A man-machine interface is employed to facilitate operation and maintenance, and a remote transmission means is employed to further improve the monitoring capability on a power grid. The comprehensive electricity quality control apparatus for a low-voltage distribution network can be widely applied to the low-voltage distribution field.

Description

A kind of comprehensive treatment device of electric energy quality of low-voltage
Technical field
The present invention relates to low-voltage distribution field, especially a kind of comprehensive treatment device of electric energy quality of low-voltage.
Background technology
China rural area and low-voltage network scale in town and country suburb is big, circuit is long, 400V/220V low pressure netting twine and users Zero distance is contacted.With rural economy development and household electrical appliances go to the countryside the going deep into of policy, various powerful household electrical appliance are occurred in In peasant family, electricity for rural use is increased rapidly, being also continuously increased with Voltage force for electrical network, brings terminal voltage low or inclined Height, reactive power increases, and power factor reduces, a series of problems, such as the quality of power supply declines.The operation present situation of rural power grids power distribution station It is as follows:1)Due to the seasonality and the mobility of rural area worker of agricultural production, cause rural power grids load fluctuation larger;2) Away from transformer station farther out, terminal voltage is relatively low during heavy load, if heightening substation exit voltage, light hours overtension can burn Ruin electrical equipment;3)Three-phase load unbalance situation generally existing, affects transformer to exert oneself, and increased loss, meeting when serious Burn distribution transformer.
At present, solution to this problem, usually expands transformer capacity, increases the line footpath of distribution line, so as to Improve the power supply capacity in platform area.But this method investment is big, long in time limit, while the reactive power of line end all matches somebody with somebody room by high Centralized compensation is provided, and reactive current makes the efficiency of transmission line of electricity lower.It is therefore necessary to using line end carry out pressure regulation and Reactive-load compensation.Low-voltage circuit end compensation device, on the one hand, can reduce the idle flow of circuit, increases the active conveying of circuit Ability, improves efficiency.On the other hand, it is possible to reduce line loss, line drop is reduced.Under identical power supply capacity, low pressure end Compensation can improve power supply quality, save track investment, lift economic benefit.
At present, each enterprise for the power quality controlling of low-voltage circuit end takes various different technical approach, such as: Capacitance reactive compensation, traditional Loading voltage regulator are adjusted, electronics is adjusted(Surely)Depressor regulation etc..The mode of capacitance reactive compensation is to pass through Reduce reactive current and reduce voltage drop, to lift terminal voltage indirectly, it is adaptable to which power factor is low, the line that there is inductance current Road;Traditional Loading voltage regulator is to lift circuit low-pressure side head end voltage by way of regulation transformer voltage ratio, it is adaptable to 10KV Circuit length causes the relatively low occasion of step down side output voltage;Electronics is adjusted(Surely)Depressor voltage regulation result is preferable, but by temperature It is larger with effects of lightning, it is relatively costly, it is only applicable to the little indoor scenarios of family or laboratory constant power demand.On the whole From the point of view of, the equal single function of technical approach that above-mentioned existing apparatus are adopted, range of application is narrow, and it is installed and safeguards all inconvenient, and By the way of contactor, not only the time is longer for the switching of compensation capacitor, and the dash current during switching is larger, produces Compared with lossy, and affect the stability and service life of system.
The content of the invention
In order to solve above-mentioned technical problem, the purpose of the present invention is:One kind is provided and realizes low-loss, height for low-voltage distribution network The Power Quality Comprehensive Treatment Device of safety and stability.
The technical solution adopted in the present invention is:A kind of comprehensive treatment device of electric energy quality of low-voltage, includes control Module, VRM Voltage Regulator Module and reactive compensation module, the first control end of the control module is connected to VRM Voltage Regulator Module Control end, the second control end of the control module is connected to the control end of reactive compensation module, the input of the low-voltage distribution network The input of connection to VRM Voltage Regulator Module, the output end of the VRM Voltage Regulator Module is connected to the defeated of reactive compensation module Enter end, the output end of the reactive compensation module is connected to the outlet line of low-voltage distribution network;The VRM Voltage Regulator Module is voltage Bidirectional modulation module.
Further, the voltage bidirectional modulation module includes 1 to 3 group bidirectional regulating circuit, and the of the control module One control end is connected to the control end of bidirectional regulating circuit.
Further, the bidirectional regulating circuit include isolating transformer, the first combination switch, the second combination switch, Three combination switches, the 4th combination switch, the secondary of the isolating transformer respectively with the live wire of the incoming line of low-voltage distribution network and The live wire connection of the output end of VRM Voltage Regulator Module, the former limit of the isolating transformer is connected to respectively by the 3rd combination switch The zero line of the incoming line of low-voltage distribution network, be connected to by the 4th combination switch VRM Voltage Regulator Module output end zero line, institute The former limit for stating isolating transformer is connected to respectively the output of VRM Voltage Regulator Module by the first combination switch and the second combination switch The live wire at end.
Further, the voltage bidirectional modulation module also includes built in bypass, the first control end of the control module It is additionally coupled to the control end of built in bypass.
Further, the reactive compensation module includes 1 to 3 group reactive power compensation circuit, and the reactive power compensation circuit includes There are fuse, controlling switch, reactor and capacitor, one end of the fuse connects with the live wire of the outlet line of low-voltage distribution network Connect, the other end of the fuse passes sequentially through the outlet line that controlling switch, reactor and capacitor are connected to low-voltage distribution network Zero line.
Further, electrical parameter measuring module, customer charge control module, overcurrent protection mould are included in the control module Block, power factor compensation control module, Voltage Stability Control module, Electro-metering module, quality of voltage monitoring module.
Further, remote communication module is also included in the control module, the remote communication module is connected with communication Interface.
Further, the communication interface is concealed antenna;Designed using concealed antenna, determine antenna safety, while Ensure that communication quality.
Further, user-machine interface module is also included in the control module, the user-machine interface module connects It is connected to display module.
Further, the device is installed in the middle of the low-voltage circuit of low-voltage distribution network or end.
The invention has the beneficial effects as follows:Apparatus of the present invention using voltage compensation be classified bidirectional modulation, coordinate IGCT and after The Intelligent time delay function of the combination switch of electrical equipment composition, effectively prevent voltage pulsation and causes line voltage unstable;And utilize The thyristor control electric capacity operating passing zero of combination switch in reactive compensation module, reduces the rush of current of traditional contactors switching, Capacitor bypasses IGCT by relay again after putting into, and maintains electric capacity to continue to run with, and can reduce the loss of system, and ensures device Security;Meanwhile, in a device operation and maintenance are made it easy to using man-machine interface, device collection is ensured using communication module The data message for arriving can remote transmission, further improve the monitoring capacity to electrical network.
Description of the drawings
Fig. 1 is the structured flowchart of apparatus of the present invention;
Fig. 2 is the concrete structure diagram of VRM Voltage Regulator Module in the present invention;
Fig. 3 is the concrete structure diagram of reactive compensation module in the present invention.
Specific embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings:
With reference to Fig. 1, a kind of comprehensive treatment device of electric energy quality of low-voltage includes control module, VRM Voltage Regulator Module And reactive compensation module, the first control end of the control module is connected to the control end of VRM Voltage Regulator Module, the control mould Second control end of block is connected to the control end of reactive compensation module, and the incoming line of the low-voltage distribution network is connected to voltage-regulation The input of module, the output end of the VRM Voltage Regulator Module is connected to the input of reactive compensation module, the reactive-load compensation The output end of module is connected to the outlet line of low-voltage distribution network;The VRM Voltage Regulator Module is voltage bidirectional modulation module.
It is further used as preferred embodiment, the voltage bidirectional modulation module includes 1 to 3 group bidirectional modulation electricity Road, the first control end of the control module is connected to the control end of bidirectional regulating circuit.
It is further used as preferred embodiment, the bidirectional regulating circuit includes isolating transformer, first compound opens Pass, the second combination switch, the 3rd combination switch, the 4th combination switch, the secondary of the isolating transformer respectively with low-voltage distribution network Incoming line live wire and VRM Voltage Regulator Module output end live wire connection, the former limit of the isolating transformer passes through respectively 3rd combination switch is connected to the zero line of the incoming line of low-voltage distribution network, is connected to VRM Voltage Regulator Module by the 4th combination switch Output end zero line, the former limit of the isolating transformer is connected to electricity by the first combination switch and the second combination switch respectively The live wire of the output end of pressure adjustment module.
With reference to Fig. 2, the i.e. secondary of isolating transformer T1 respectively with the live wire and voltage-regulation of the incoming line of low-voltage distribution network The live wire connection of the output end of module, as shown in Fig. 2 the live wire of the output end of the Same Name of Ends of the secondary of T1 and VRM Voltage Regulator Module Connection;The former limit of the isolating transformer T1 is connected to respectively the zero of the incoming line of low-voltage distribution network by the 3rd combination switch K3 Line, be connected to by the 4th combination switch K4 VRM Voltage Regulator Module output end zero line, as illustrated, wherein isolating transformer The Same Name of Ends of the former limit of T1 is connected to the zero line of the output end of VRM Voltage Regulator Module by the 4th combination switch K4;The isolation becomes The former limit of depressor T1 is connected to respectively the output end of VRM Voltage Regulator Module by the first combination switch K1 and the second combination switch K2 Live wire, as illustrated, wherein the Same Name of Ends of the former limit of isolating transformer T1 by the first combination switch K1 be connected to voltage adjust The live wire of the output end of section module.
Bidirectional regulating circuit is answered with the compensation principle of voltage vacancy using an isolating transformer and two groups in the present invention Combination switch respectively switching method come realize voltage Downward addition and negative sense superposition;As shown in Fig. 2 working as combination switch K1 and K3 Put into simultaneously, and during combination switch K2 and K4 excision, electric current is flowed into from the Same Name of Ends of isolating transformer T1 former limits, now, output The voltage at end is equal to the Downward addition of input terminal voltage and isolating transformer T1 secondary voltages, and output end voltage is raised, and device is Positive pressure regulation.Combination switch K2 and K4 puts into simultaneously, and during combination switch K1 and K3 excision, electric current is from isolating transformer T1 former limits Same Name of Ends flow out, now, the voltage of output end is superimposed equal to input terminal voltage with the negative sense of isolating transformer T1 secondary voltages, Output end voltage declines, and device is negative sense pressure regulation.
Combination switch is by IGCT with relay group into combination switch conducting moment is by IGCT(Controllable silicon)Zero passage is touched Send out, need after certain time delay, then by relay adhesive, conducting, such conduction mode can avoid the product of harmonic wave It is raw, realized using the method for hysteresis comparator in the control module.
It is further used as preferred embodiment, the voltage bidirectional modulation module also includes built in bypass, the control First control end of molding block is additionally coupled to the control end of built in bypass.
The effect of built in bypass be when line voltage is in acceptability limit, control aforementioned four combination switch K1, K2, When K3 and K4 disconnect, it is connected by built in bypass with output end between the input of VRM Voltage Regulator Module, therefore now simultaneously Unfavorable VRM Voltage Regulator Module is adjusted to voltage.
With reference to Fig. 3, it is further used as preferred embodiment, the reactive compensation module includes 1 to 3 group reactive-load compensation Circuit, the reactive power compensation circuit includes fuse, controlling switch, reactor and capacitor, one end of the fuse with The live wire connection of the outlet line of low-voltage distribution network, the other end of the fuse passes sequentially through controlling switch, reactor and electric capacity Device is connected to the zero line of the outlet line of low-voltage distribution network.
Wherein controlling switch adopts combination switch, reactive-load compensation to realize by way of device with Capacitor Switched by Compound Switch, Its fling-cut switch is IGCT and relay combination switch in parallel, and main working process is:Thyristor control electric capacity zero passage is thrown Cut, to reduce the rush of current of traditional contactors switching, again IGCT bypassed by relay after capacitor input, maintain electric capacity after Reforwarding row, to reduce the loss of system.
For example reactive compensation module adopts three groups of reactive power compensation circuits, and the reactive power compensation circuit is 6% or so reactance Rate The LC branch roads of configuration reactive-load compensation, the compensation capacity of single spur track is 3.33KVar, the total compensation capacity of device be 3.33KVar × 3, i.e. 10KVar.The capacity that can be compensated as needed, coordinates intelligent control module and combination switch, split-phase to adjust capacitor Group, carries out automatic grouping switching;By the way of the filtering of multiple branch circuit single tuning, the high order tuning filterings such as 5,7,11,13 are taken into account, electricity Anti- device adopts low-loss filter reactor unshakable in one's determination, reactor normally to run temperature rise less than 35K.
When compensating electric capacity is out of service, automatic discharging, it is ensured that safety.Can ensure that capacitor is fully completed electric discharge.Cut After except capacitor, then same group capacitor is put into, and control to be performed again after time delay 180s by control circuit, first thrown and first cut, after Cut after throwing, loop control, it is ensured that the uniformity being substantially discharged with capacitor bank operation of capacitor.
Combination switch realizes operating passing zero in the moment for switching on and off by IGCT, does not generate heat, without harmonic wave, idle; And magnetic latching relay had both had through-flow big, the athermic advantage of contacts of contactor during long-time is connected, need not inhale again Close and maintain electric current;Overall Power Consumption very little.
Combination switch is designed with the running status automatic detection function of IGCT, magnetic latching relay, if breaking down, Refusal closure moves back throwing disconnection automatically, and trouble light flashes, and points out malfunction, easy access to change.
It is further used as preferred embodiment, electrical parameter measuring module, customer charge is included in the control module Control module, overcurrent protection module, power factor compensation control module, Voltage Stability Control module, Electro-metering module, voltage Quality monitoring module.
Multiple functional modules are included in the control module, such as quality of voltage monitoring module therein can be used to analyze With record phase voltage, phase current, active power, reactive power and apparent energy, power factor, mains frequency, timesharing multi tariff Electric energy, and analyze phase voltage, each harmonic content of phase current.
It is further used as preferred embodiment, remote communication module is also included in the control module, it is described long-range Communication module is connected with communication interface.
It is further used as preferred embodiment, the communication interface is concealed antenna.
It is further used as preferred embodiment, user-machine interface module is also included in the control module, it is described User-machine interface module is connected with display module.
It is further used as preferred embodiment, the device is installed in the middle of the low-voltage circuit of low-voltage distribution network or end.
It is more than that the preferable enforcement to the present invention is illustrated, but the invention is not limited to the enforcement Example, those of ordinary skill in the art can also make a variety of equivalents on the premise of without prejudice to spirit of the invention or replace Change, the deformation or replacement of these equivalents are all contained in the application claim limited range.

Claims (8)

1. a kind of comprehensive treatment device of electric energy quality of low-voltage, it is characterised in that:Include control module, VRM Voltage Regulator Module And reactive compensation module, the first control end of the control module is connected to the control end of VRM Voltage Regulator Module, the control mould Second control end of block is connected to the control end of reactive compensation module, and the incoming line of the low-voltage distribution network is connected to voltage-regulation The input of module, the output end of the VRM Voltage Regulator Module is connected to the input of reactive compensation module, the reactive-load compensation The output end of module is connected to the outlet line of low-voltage distribution network;The VRM Voltage Regulator Module is voltage bidirectional modulation module;It is described Voltage bidirectional modulation module includes 1 to 3 group bidirectional regulating circuit, and the first control end of the control module is connected to two-way tune The control end on economize on electricity road, the bidirectional regulating circuit include isolating transformer, the first combination switch, the second combination switch, the Three combination switches, the 4th combination switch, the secondary of the isolating transformer respectively with the live wire of the incoming line of low-voltage distribution network and The live wire connection of the output end of VRM Voltage Regulator Module, the former limit of the isolating transformer is connected to respectively by the 3rd combination switch The zero line of the incoming line of low-voltage distribution network, be connected to by the 4th combination switch VRM Voltage Regulator Module output end zero line, institute The former limit for stating isolating transformer is connected to respectively the output of VRM Voltage Regulator Module by the first combination switch and the second combination switch The live wire at end.
2. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, it is characterised in that:The voltage Bidirectional modulation module also includes built in bypass, and the first control end of the control module is additionally coupled to the control of built in bypass End.
3. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, it is characterised in that:It is described idle Compensating module includes 1 to 3 group reactive power compensation circuit, and the reactive power compensation circuit includes fuse, controlling switch, reactor And capacitor, one end of the fuse is connected with the live wire of the outlet line of low-voltage distribution network, the other end of the fuse according to The zero line of the secondary outlet line that low-voltage distribution network is connected to by controlling switch, reactor and capacitor.
4. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, it is characterised in that:The control Electrical parameter measuring module, customer charge control module, overcurrent protection module, power factor compensation control mould are included in module Block, Voltage Stability Control module, Electro-metering module, quality of voltage monitoring module.
5. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 4, it is characterised in that:The control Remote communication module is also included in module, the remote communication module is connected with communication interface.
6. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 5, it is characterised in that:The communication Interface is concealed antenna.
7. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 4, it is characterised in that:The control User-machine interface module is also included in module, the user-machine interface module is connected with display module.
8. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, it is characterised in that:The device peace In the middle of low-voltage circuit loaded on low-voltage distribution network or end.
CN201510262363.7A 2015-05-21 2015-05-21 Electricity quality comprehensive control apparatus for low-voltage distribution network CN104868475B (en)

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CN106159958A (en) * 2016-03-18 2016-11-23 武汉武新电气科技股份有限公司 The comprehensive lifting device of rural power grids low-voltage and method on a kind of post
CN107834571B (en) * 2017-12-04 2020-05-05 杭州电力设备制造有限公司 Rural power grid low-voltage treatment method and system
CN108306293B (en) * 2018-01-18 2020-12-15 浙江日业电力科技有限公司 Low-voltage electric energy quality control device
CN108711869A (en) * 2018-06-15 2018-10-26 东北农业大学 A kind of reactive power compensation device
CN109245312A (en) * 2018-11-15 2019-01-18 东北电力大学 A kind of comprehensive treatment device of electric energy quality of low-voltage

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JP3508347B2 (en) * 1995-12-11 2004-03-22 株式会社明電舎 Feeder voltage compensation system and equipment
CN202373979U (en) * 2011-12-06 2012-08-08 重庆瑞升康博电气有限公司 Intelligent reactive power compensation and power parameter display integrated control device
CN204668955U (en) * 2015-05-21 2015-09-23 广州开能电气实业有限公司 A kind of comprehensive treatment device of electric energy quality of low-voltage

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