CN104868475A - Electricity quality comprehensive control apparatus for low-voltage distribution network - Google Patents
Electricity quality comprehensive control apparatus for low-voltage distribution network Download PDFInfo
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- CN104868475A CN104868475A CN201510262363.7A CN201510262363A CN104868475A CN 104868475 A CN104868475 A CN 104868475A CN 201510262363 A CN201510262363 A CN 201510262363A CN 104868475 A CN104868475 A CN 104868475A
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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
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
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 suburb, town and country low-voltage network scale is large, circuit is long, 400V/220V low pressure netting twine contacts with users' zero distance.Along with the development of rural economy and household electrical appliances are gone to the countryside going deep into of policy, various powerful household electrical appliance appear in peasant family, electricity for rural use increases rapidly, also constantly increasing with Voltage force of electrical network, bring terminal voltage on the low side or higher, reactive power increases, and power factor reduces, degradation series of problems under the quality of power supply.The operation present situation of rural power grids power distribution station is as follows: 1) due to the seasonality of agricultural production and the mobility of rural area worker, cause rural power grids load fluctuation larger; 2) comparatively far away apart from transformer station, during heavy load, terminal voltage is lower, if heighten substation exit voltage, light hours overtension, can burn power consumption equipment; 3) three-phase load unbalance situation ubiquity, affects transformer and exerts oneself, and add loss, can burn distribution transformer time serious.
At present, solution to this problem, is generally expand transformer capacity, strengthens the wire diameter of distribution line, thus improve the power supply capacity in platform district.But the investment of this method is large, long in time limit, the reactive power of line end all joins room centralized compensation by height simultaneously provides, and reactive current makes the efficiency of transmission line lower.Pressure regulation and reactive power compensation is carried out at line end so be necessary to adopt.Low-voltage circuit end compensation arrangement, on the one hand, can reduce the idle flow of circuit, increases the meritorious conveying capacity of circuit, raises the efficiency.On the other hand, can line loss be reduced, reduce line drop.Under identical power supply capacity, low pressure end compensates can improve power supply quality, saves track investment, promotes economic benefit.
At present, each enterprise takes multiple different technical approach for the power quality controlling of low-voltage circuit end, as: capacitance reactive compensation, traditional Loading voltage regulator regulate, electronics adjusts (surely) depressor adjustment etc.The mode of capacitance reactive compensation reduces voltage drop by reducing reactive current, indirectly promotes terminal voltage, be applicable to power factor low, there is the circuit of inductance current; Tradition Loading voltage regulator is by regulating the mode of transformer voltage ratio to promote circuit low-pressure side head end voltage, is applicable to 10KV circuit length and causes the occasion that step down side output voltage is lower; Electronics adjusts (surely) depressor voltage regulation result better, but by temperature and effects of lightning comparatively greatly, cost is higher, is only applicable to family or the little indoor scenarios of laboratory constant power demand.On the whole, the equal function singleness of technical approach that above-mentioned existing apparatus adopts, range of application is narrow, its installation and maintenance are all inconvenient, and the switching of compensation condenser adopts the mode of contactor, and not only the time is longer, and impulse current in switching process is larger, produce comparatively lossy, and the stability of influential system and useful life.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the invention is: a kind of Power Quality Comprehensive Treatment Device realizing low-loss, high security and stability for low-voltage distribution network is provided.
The technical solution adopted in the present invention is: a kind of comprehensive treatment device of electric energy quality of low-voltage, include control module, Voltage Regulator Module and reactive compensation module, first control end of described control module is connected to the control end of Voltage Regulator Module, second control end of described control module is connected to the control end of reactive compensation module, the incoming line of described low-voltage distribution network is connected to the input of Voltage Regulator Module, the output of described Voltage Regulator Module is connected to the input of reactive compensation module, the output of described reactive compensation module is connected to the outlet line of low-voltage distribution network, described Voltage Regulator Module is voltage bidirectional modulation module.
Further, described voltage bidirectional modulation module includes 1 to 3 group bidirectional regulating circuit, and the first control end of described control module is connected to the control end of bidirectional regulating circuit.
Further, described bidirectional regulating circuit includes isolating transformer, first combination switch, second combination switch, 3rd combination switch, 4th combination switch, the secondary of described isolating transformer is connected with the live wire of the live wire of the incoming line of low-voltage distribution network and the output of Voltage Regulator Module respectively, the former limit of described isolating transformer is connected to the zero line of the incoming line of low-voltage distribution network respectively by the 3rd combination switch, the zero line of the output of Voltage Regulator Module is connected to by the 4th combination switch, the former limit of described isolating transformer is connected to the live wire of the output of Voltage Regulator Module respectively by the first combination switch and the second combination switch.
Further, described voltage bidirectional modulation module also includes built in bypass, and the first control end of described control module is also connected to the control end of built in bypass.
Further, described reactive compensation module includes 1 to 3 group reactive power compensation circuit, described reactive power compensation circuit includes fuse, control switch, reactor and capacitor, one end of described fuse is connected with the live wire of the outlet line of low-voltage distribution network, and the other end of described fuse is connected to the zero line of the outlet line of low-voltage distribution network successively by control switch, reactor and capacitor.
Further, electrical parameter measuring module, customer charge control module, overcurrent protection module, power factor compensation control module, Voltage Stability Control module, Electro-metering module, quality of voltage monitoring module is included in described control module.
Further, also include remote communication module in described control module, described remote communication module is connected with communication interface.
Further, described communication interface is concealed antenna; Use concealed antenna designs, and determines antenna safety, ensure that communication quality simultaneously.
Further, also include user-machine interface module in described control module, described user-machine interface model calling has display module.
Further, this device is installed on low-voltage circuit centre or the end of low-voltage distribution network.
The invention has the beneficial effects as follows: apparatus of the present invention utilize voltage compensation classification bidirectional modulation, coordinate the Intelligent time delay function of the combination switch of thyristor and relay composition, effectively prevent voltage fluctuation and cause line voltage unstable; And utilize the thyristor control electric capacity operating passing zero of combination switch in reactive compensation module, reduce the rush of current of traditional contactors switching, again by relay bypass thyristor after capacitor drops into, maintain electric capacity and continue to run, the loss of system can be reduced, and the fail safe of assurance device; Meanwhile, adopt man-machine interface to make it to be easy to operation and maintenance in a device, the data message adopting communication module assurance device to collect can remote transmission, the further monitoring capacity of raising to electrical network.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of apparatus of the present invention;
Fig. 2 is the concrete structure figure of Voltage Regulator Module in the present invention;
Fig. 3 is the concrete structure figure of reactive compensation module in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
With reference to Fig. 1, a kind of comprehensive treatment device of electric energy quality of low-voltage, include control module, Voltage Regulator Module and reactive compensation module, first control end of described control module is connected to the control end of Voltage Regulator Module, second control end of described control module is connected to the control end of reactive compensation module, the incoming line of described low-voltage distribution network is connected to the input of Voltage Regulator Module, the output of described Voltage Regulator Module is connected to the input of reactive compensation module, and the output of described reactive compensation module is connected to the outlet line of low-voltage distribution network; Described Voltage Regulator Module is voltage bidirectional modulation module.
Be further used as preferred embodiment, described voltage bidirectional modulation module includes 1 to 3 group bidirectional regulating circuit, and the first control end of described control module is connected to the control end of bidirectional regulating circuit.
Be further used as preferred embodiment, described bidirectional regulating circuit includes isolating transformer, first combination switch, second combination switch, 3rd combination switch, 4th combination switch, the secondary of described isolating transformer is connected with the live wire of the live wire of the incoming line of low-voltage distribution network and the output of Voltage Regulator Module respectively, the former limit of described isolating transformer is connected to the zero line of the incoming line of low-voltage distribution network respectively by the 3rd combination switch, the zero line of the output of Voltage Regulator Module is connected to by the 4th combination switch, the former limit of described isolating transformer is connected to the live wire of the output of Voltage Regulator Module respectively by the first combination switch and the second combination switch.
With reference to Fig. 2, namely the secondary of isolating transformer T1 is connected with the live wire of the live wire of the incoming line of low-voltage distribution network and the output of Voltage Regulator Module respectively, and as shown in Figure 2, the Same Name of Ends of the secondary of T1 is connected with the live wire of the output of Voltage Regulator Module; The former limit of described isolating transformer T1 is connected to the zero line of the incoming line of low-voltage distribution network respectively by the 3rd combination switch K3, is connected to the zero line of the output of Voltage Regulator Module by the 4th combination switch K4, as shown in the figure, wherein the Same Name of Ends on the former limit of isolating transformer T1 is connected to the zero line of the output of Voltage Regulator Module by the 4th combination switch K4; The former limit of described isolating transformer T1 is connected to the live wire of the output of Voltage Regulator Module respectively by the first combination switch K1 and the second combination switch K2, as shown in the figure, wherein the Same Name of Ends on the former limit of isolating transformer T1 is connected to the live wire of the output of Voltage Regulator Module by the first combination switch K1.
In the present invention, bidirectional regulating circuit uses the compensation principle of voltage vacancy, adopts the method for an isolating transformer and two groups of combination switches switching respectively to realize the Downward addition of voltage and negative sense superposes; As shown in Figure 2, when combination switch K1 and K3 drops into simultaneously, and during combination switch K2 and K4 excision, electric current flows into from the Same Name of Ends on the former limit of isolating transformer T1, now, the voltage of output equals the Downward addition of input terminal voltage and isolating transformer T1 secondary voltage, and output end voltage raises, and device is forward pressure regulation.Combination switch K2 and K4 drops into simultaneously, and when combination switch K1 and K3 excises, electric current flows out from the Same Name of Ends on the former limit of isolating transformer T1, now, the voltage of output equals input terminal voltage and superposes with the negative sense of isolating transformer T1 secondary voltage, and output end voltage declines, and device is negative sense pressure regulation.
Combination switch is made up of thyristor and relay, combination switch conducting is by thyristor (controllable silicon) zero cross fired instantaneously, need after certain time delay, again by relay adhesive, conducting, such conduction mode can avoid generation ofharmonic, adopts the method for hysteresis comparator in the control module to realize.
Be further used as preferred embodiment, described voltage bidirectional modulation module also includes built in bypass, and the first control end of described control module is also connected to the control end of built in bypass.
The effect of built in bypass is when line voltage is in acceptability limit, control above-mentioned four combination switches K1, K2, K3 and K4 when all disconnecting, be connected by built in bypass with output between the input of Voltage Regulator Module, therefore now do not utilize Voltage Regulator Module to adjust voltage.
With reference to Fig. 3, be further used as preferred embodiment, described reactive compensation module includes 1 to 3 group reactive power compensation circuit, described reactive power compensation circuit includes fuse, control switch, reactor and capacitor, one end of described fuse is connected with the live wire of the outlet line of low-voltage distribution network, and the other end of described fuse is connected to the zero line of the outlet line of low-voltage distribution network successively by control switch, reactor and capacitor.
Wherein control switch adopts combination switch, reactive power compensation is realized by the mode of device with Capacitor Switched by Compound Switch, its fling-cut switch is the combination switch of thyristor and relay parallel connection, main working process is: thyristor control electric capacity operating passing zero, to reduce the rush of current of traditional contactors switching, again by relay bypass thyristor after capacitor drops into, maintain electric capacity and continue to run, to reduce the loss of system.
Such as reactive compensation module adopts three groups of reactive power compensation circuits, and described reactive power compensation circuit is the LC branch road of the reactance Rate configuration reactive power compensation of about 6%, and the compensation capacity of single spur track is 3.33KVar, and the total compensation capacity of device is 3.33KVar × 3, i.e. 10KVar.The capacity that can compensate as required, coordinate intelligent control module and combination switch, phase-splitting regulating capacitor group, carries out Auto-grouping switching; Adopt the mode of multiple branch circuit single tuning filtering, take into account the high order tuning filterings such as 5,7,11,13, reactor adopts low-loss filter reactor unshakable in one's determination, and reactor normally runs temperature rise and is no more than 35K.
When building-out capacitor is out of service, automatic discharging, guarantees safety.Can guarantee that capacitor terminates electric discharge completely.Namely after excising capacitor, then drop into same group capacitor, and perform again after controlling time delay 180s by control circuit, first throw and first cut, cut after rear throwing, loop control, ensure that the abundant electric discharge of capacitor and the uniformity of Capacitor banks operation.
The moment that combination switch is switching on and off realizes operating passing zero by thyristor, does not generate heat, without harmonic wave, idle; And magnetic latching relay had both had through-flow large, the athermic advantage of contacts of contactor during long-time connection, adhesive had not been needed again to maintain electric current; Overall Power Consumption is very little.
Combination switch is designed with the running status automatic detection function of thyristor, magnetic latching relay, if break down, then refusal closes or automatically moves back to throw and disconnects, and trouble light flicker, prompting malfunction, easy access replacing.
Be further used as preferred embodiment, in described control module, include electrical parameter measuring module, customer charge control module, overcurrent protection module, power factor compensation control module, Voltage Stability Control module, Electro-metering module, quality of voltage monitoring module.
Multiple functional module is included in described control module, such as quality of voltage monitoring module wherein can be used for analyzing and record phase voltage, phase current, active power, reactive power and apparent power, power factor, mains frequency, timesharing multi tariff electric energy, and analyze each harmonic content of phase voltage, phase current.
Be further used as preferred embodiment, also include remote communication module in described control module, described remote communication module is connected with communication interface.
Be further used as preferred embodiment, described communication interface is concealed antenna.
Be further used as preferred embodiment, also include user-machine interface module in described control module, described user-machine interface model calling has display module.
Be further used as preferred embodiment, this device is installed on low-voltage circuit centre or the end of low-voltage distribution network.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art can also make all equivalents or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (10)
1. a comprehensive treatment device of electric energy quality of low-voltage, it is characterized in that: include control module, Voltage Regulator Module and reactive compensation module, first control end of described control module is connected to the control end of Voltage Regulator Module, second control end of described control module is connected to the control end of reactive compensation module, the incoming line of described low-voltage distribution network is connected to the input of Voltage Regulator Module, the output of described Voltage Regulator Module is connected to the input of reactive compensation module, and the output of described reactive compensation module is connected to the outlet line of low-voltage distribution network; Described Voltage Regulator Module is voltage bidirectional modulation module.
2. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, it is characterized in that: described voltage bidirectional modulation module includes 1 to 3 group bidirectional regulating circuit, and the first control end of described control module is connected to the control end of bidirectional regulating circuit.
3. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 2, it is characterized in that: described bidirectional regulating circuit includes isolating transformer, first combination switch, second combination switch, 3rd combination switch, 4th combination switch, the secondary of described isolating transformer is connected with the live wire of the live wire of the incoming line of low-voltage distribution network and the output of Voltage Regulator Module respectively, the former limit of described isolating transformer is connected to the zero line of the incoming line of low-voltage distribution network respectively by the 3rd combination switch, the zero line of the output of Voltage Regulator Module is connected to by the 4th combination switch, the former limit of described isolating transformer is connected to the live wire of the output of Voltage Regulator Module respectively by the first combination switch and the second combination switch.
4. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, is characterized in that: described voltage bidirectional modulation module also includes built in bypass, and the first control end of described control module is also connected to the control end of built in bypass.
5. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 2, it is characterized in that: described reactive compensation module includes 1 to 3 group reactive power compensation circuit, described reactive power compensation circuit includes fuse, control switch, reactor and capacitor, one end of described fuse is connected with the live wire of the outlet line of low-voltage distribution network, and the other end of described fuse is connected to the zero line of the outlet line of low-voltage distribution network successively by control switch, reactor and capacitor.
6. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, is characterized in that: include electrical parameter measuring module, customer charge control module, overcurrent protection module, power factor compensation control module, Voltage Stability Control module, Electro-metering module, quality of voltage monitoring module in described control module.
7. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 6, it is characterized in that: also include remote communication module in described control module, described remote communication module is connected with communication interface.
8. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 7, is characterized in that: described communication interface is concealed antenna.
9. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 6, is characterized in that: also include user-machine interface module in described control module, described user-machine interface model calling has display module.
10. a kind of comprehensive treatment device of electric energy quality of low-voltage according to claim 1, is characterized in that: this device is installed on low-voltage circuit centre or the end of low-voltage distribution network.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN106849101A (en) * | 2017-01-22 | 2017-06-13 | 石家庄铁道大学 | A kind of step voltage regulator |
| CN107834571A (en) * | 2017-12-04 | 2018-03-23 | 浙江群力电气有限公司 | A kind of rural power grids low-voltage administering method and system |
| CN108306293A (en) * | 2018-01-18 | 2018-07-20 | 浙江日业电力科技有限公司 | Low-voltage electric energy quality controlling device |
| CN108711869A (en) * | 2018-06-15 | 2018-10-26 | 东北农业大学 | A kind of reactive power compensation device |
| CN109088411A (en) * | 2018-08-28 | 2018-12-25 | 贵州电网有限责任公司 | A kind of terminal voltage fining regulator |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| CN108711869A (en) * | 2018-06-15 | 2018-10-26 | 东北农业大学 | A kind of reactive power compensation device |
| CN109088411A (en) * | 2018-08-28 | 2018-12-25 | 贵州电网有限责任公司 | A kind of terminal voltage fining regulator |
| 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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