CN105790227A - Series compensation zero-loss current limiting integrated system - Google Patents
Series compensation zero-loss current limiting integrated system Download PDFInfo
- Publication number
- CN105790227A CN105790227A CN201610248993.3A CN201610248993A CN105790227A CN 105790227 A CN105790227 A CN 105790227A CN 201610248993 A CN201610248993 A CN 201610248993A CN 105790227 A CN105790227 A CN 105790227A
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- CN
- China
- Prior art keywords
- series compensation
- compensation capacitor
- current
- current limliting
- limiting reactor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
Abstract
The invention relates to a series compensation zero-loss current limiting integrated system which comprises a series compensation capacitor, a current limiting reactor, a discharge protection system, an intelligent protection system and an intelligence control system, which are installed in a power distribution cabinet, wherein the series compensation capacitor compensates inductive reactance in a circuit, the current limiting reactor limits short-circuited current in the circuit, the discharge protection system releases the electric energy of the series compensation capacitor after short-circuited protection of the series compensation capacitor, the intelligent protection system protects the series compensation capacitor from being burnt, and the intelligence control system controls in/out of service of the current limiting reactor. The series compensation zero-loss current limiting integrated system is simply structured, safe and reliable, and can limit short-circuited current when short circuit occurs, and compensate distribution inductive reactance of lines through the series compensation capacitor, thereby improving system stability and line voltage quality. Power delivery distance can be prolonged, power transmission capability can be improved, and comprehensive electric energy utilization rate can be increased.
Description
Technical field
The present invention relates to electric power system power distribution equipment current limiting technique field, be specifically related to a kind of series compensation zero loss current limliting integral system.
Background technology
Along with expanding economy, electric load is growth sharply therewith also, and the quality of voltage problem that mesohigh long distance transmission line brings comes out gradually.For the area that population density is less, radius of electricity supply is relatively big, and transmission line of electricity is generally longer.When load is lighter in early days, still can be met user demand by terminal voltage；But along with social progress and economic development, heavy users is continuously increased, load current pressure drop on the line substantially strengthens, cause the supply voltage quality severe overweight to load, the line end voltage having during load peak only has the 80% of rated voltage, cause that neighbouring industry and residential electricity consumption equipment are not normally functioning, directly affects the production of this area people and life.
It is known that power system is short-circuited during fault, short circuit current is generally rated current tens times, even hundreds of times, and along with the sharp increase of electric load, the short circuit current constantly increased is increasing to the impact of power system electrical equipment；Meanwhile, the connecting-disconnecting function of existing chopper is difficult to meet cut-off huge short circuit current.Therefore for solving this great difficult problem, the mode that current-limiting reactor is concatenated in loop is widely used in power system electrical power trans mission/distribution system.Though current-limiting reactor series connection in the loop can limiting short-circuit current intensity, reduce short circuit current to the impact of electrical equipment in power system, and maintain busbar voltage, it is to avoid the further expansion of short trouble.But series connection current-limiting reactor has a lot of weak point, first, produces the financial burden that huge reactive loss also cause the user is very big in current-limiting reactor series loop；Secondly, when choosing the reactance value of current-limiting reactor, after often there is the requirement meeting limiting short-circuit current, the contradiction of user side brownout under rated current.In the long distance delivery process of power system transmission and distribution network, transmission line of electricity also can produce induction reactance, the substantially equivalent reactor defined in a kind of stealth, potential concatenation user load loop, causes user side voltage to reduce equally, has again bigger reactive loss simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of series compensation zero loss current limliting integral system, this system structure is simple, safe and reliable, both series compensation capacitor can have been passed through, distribution induction reactance with compensated line, improve the stability of system, improve the quality of voltage of circuit, strengthen power transmission distance and increase conveying capacity, thus improve the comprehensive utilization ratio of electric energy.
For achieving the above object, present invention employs techniques below scheme: include the series compensation capacitor, current-limiting reactor, discharge prevention system, intelligent protection system and the intelligence control system that are arranged in power distribution cabinet；Described series compensation capacitor is for compensating the induction reactance in circuit; described current-limiting reactor is for the short circuit current in limiting circuit; described discharge prevention system is for discharging its electric energy after the protection of series compensation capacitor short circuit; described intelligent protection system is used for protecting series compensation capacitor not to be burned, and described intelligence control system is moved back for the throwing controlling current-limiting reactor.
Described discharge prevention system includes current limliting antivibrator and znr, and the input of described current limliting antivibrator is connected with the end of incoming cables of described series compensation capacitor, and the oxidized zinc nonlinear resistance of its outfan is connected with the leading-out terminal of series compensation capacitor.
Described current limliting antivibrator is composed in parallel by inductance L and resistance R.
Described intelligent protection system includes the high-speed eddy switch being connected in parallel on series compensation capacitor two ends, and described high-speed eddy switch controls it by the controller being arranged in power distribution cabinet and cut-offs.
Described intelligent protection system also includes the bidirectional triode thyristor being connected in parallel on series compensation capacitor two ends.
Described Based Intelligent Control system includes the branch switch being connected in parallel on current-limiting reactor two ends, and described branch switch controls it by the controller being arranged in power distribution cabinet and cut-offs.
Described high-speed eddy switch is vacuum extinction chopper.
Described branch switch is vacuum extinction chopper.
As shown from the above technical solution, present configuration is simple, safe and reliable, can pass through series compensation capacitor, with the distribution induction reactance of compensated line, improve the stability of system, improve the quality of voltage of circuit, strengthen power transmission distance and increase conveying capacity, improve the comprehensive utilization ratio of electric energy.The current-limiting reactor concatenated in load circuit controls its throwing by intelligence control system and moves back so that under normal power supply running status, current-limiting reactor is by branch switch short circuit, and no matter how load changes, and makes user's load terminal voltage equal to busbar voltage.Current-limiting reactor by after branch switch short circuit, will not any financial burden of cause the user, under specified running status, it is achieved the economic aim of current-limiting reactor zero loss.When power system is short-circuited fault, controller judges short trouble by fast algorithm, sends combined floodgate order to high-speed eddy switch immediately, and high-speed eddy switch can close a floodgate rapidly within 2 milliseconds, quickly puts into current-limiting reactor limiting short-circuit current；Guarantee current-limiting reactor can the intensity of effective limiting short-circuit current, reduce short circuit current to the impact of electrical equipment in power system, it is to avoid the further expansion of short trouble.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described:
As it is shown in figure 1, the series compensation zero loss current limliting integral system of the present embodiment, including the series compensation capacitor 1 being arranged in power distribution cabinet, current-limiting reactor 2, discharge prevention system, intelligent protection system and intelligence control system；The capacitance of this series compensation capacitor 1 selects to select according to the induction reactance in circuit; to compensate the induction reactance in circuit; current-limiting reactor 2 is for the short circuit current in limiting circuit; discharge prevention system is for discharging its electric energy after the protection of series compensation capacitor 1 short circuit; intelligent protection system is used for protecting series compensation capacitor 1 not to be burned, and intelligence control system is moved back for the throwing controlling current-limiting reactor 2.
Discharge prevention system includes current limliting antivibrator 3 and znr 4, and the input of current limliting antivibrator 3 is connected with the end of incoming cables of series compensation capacitor 1, and the oxidized zinc nonlinear resistance 4 of its outfan is connected with the leading-out terminal of series compensation capacitor 1.This current limliting antivibrator 3, is used for limiting electric energy release dash current after series compensation capacitor 1 short circuit is protected, it is prevented that series compensation capacitor 1 damages owing to crossing stream.This znr 4; can after series compensation capacitor short circuit be protected; absorb rapidly the electric energy of series compensation capacitor 1 release, it is ensured that the terminal voltage of series compensation capacitor 1 is controlled in load rated safety range of operation, it is ensured that the safe operation that series compensation capacitor 1 can be permanently effective.So series compensation capacitor 1 both end voltage can be limited in a relatively low level, the capacity of such series compensation container 1 can reduce greatly, its cost can be greatly reduced naturally, the volume of equipment obtains effective control simultaneously, complete equipment cost can be greatly reduced, the volume of equipment obtains effective control simultaneously, it is possible to achieve carry out multiple spot compensation in systems, it is possible to the fully effective quality of voltage problem solving the transmission of electricity of power system distance heavy load.In the present embodiment, this current limliting antivibrator 3 is composed in parallel by inductance L and resistance R.
Intelligent protection system includes the high-speed eddy switch 5 and the bidirectional triode thyristor 6 that are connected in parallel on series compensation capacitor 1 two ends, and this high-speed eddy switch 5 controls it by the controller being arranged in power distribution cabinet and cut-offs.When outlet short trouble in circuit, controller controls high-speed eddy switch 5 combined floodgate immediately, can effectively prevent series compensation capacitor 1 from damaging because of overvoltage.This example high speed eddy current switch 5 drives for eddy current, vacuum interrupter arc extinguishing chopper.
Based Intelligent Control system includes the branch switch 7 being connected in parallel on current-limiting reactor 2 two ends, and branch switch 7 controls it by the controller being arranged in power distribution cabinet and cut-offs.When the circuit is operating normally, this branch switch 7 is in closure state, so that current-limiting reactor 2 is carried out short circuit, avoid the loss that in circuit, current-limiting reactor 2 brings, will not any financial burden of cause the user, under specified running status, it is achieved the economic aim of current-limiting reactor zero loss；When circuit is short-circuited fault, branch switch 7 disconnects, and current-limiting reactor 2 puts into operation, it is ensured that current-limiting reactor 2 can the intensity of effective limiting short-circuit current, reduce short circuit current to the impact of electrical equipment in power system, it is to avoid the further expansion of short trouble.In the present embodiment, this branch switch 7 adopts eddy current to drive, vacuum interrupter arc extinguishing chopper.
Operation principle is as follows: when circuit is short-circuited fault, when line current exceedes properly functioning allowed band, and high-speed eddy switch 5 is quickly by series compensation capacitor 1 short circuit, it is ensured that the safety of series compensation capacitor 1；Simultaneously in current-limiting reactor 2 series loop, make current-limiting reactor 2 can the intensity of effective limiting short-circuit current, reduce short circuit current to the impact of electrical equipment in power system, it is to avoid expanding further of short trouble.When the terminal voltage of series compensation capacitor 1 exceed can two-way control silicon 6 conducting voltage time, this bidirectional triode thyristor 6 turns on, thus series compensation capacitor 1 short circuit, it is prevented that series compensation capacitor 1 damages because of overvoltage；After series compensation capacitor 1 is protected, series compensation capacitor is discharged by discharge prevention system immediately, the electric energy in release series compensation capacitor 1；When the electric current that bidirectional triode thyristor 2 passes through is less than freewheel current, bidirectional triode thyristor 6 disconnects immediately, now high-speed eddy switch 5 combined floodgate, and this series compensation capacitor 1 is switched 5 protections by high-speed eddy；After short trouble excises, when line current returns normal value, controller sends separating brake order, high-speed eddy switch 5 disconnection, makes series compensation capacitor 1 put into circuit and runs.
Present configuration is simple, safe and reliable, can pass through series compensation capacitor, with the distribution induction reactance of compensated line, improves the stability of system, improves the quality of voltage of circuit, strengthens power transmission distance and increases conveying capacity, improve the comprehensive utilization ratio of electric energy.When line failure, switch 5 by high-speed eddy and be connected in parallel on the bidirectional triode thyristor 6 at series compensation capacitor 1 two ends, quick short circuit series compensation capacitor 1.5 realizations duplicate protection to series compensation capacitor 1 is switched, it is prevented that series compensation capacitor 1 damages because of overvoltage by bidirectional triode thyristor 6 and high-speed eddy.Electric energy when discharge prevention system stream occurred for circuit, after series compensation capacitor 1 is shorted, in release series compensation capacitor 1, it is ensured that series compensation capacitor 1 normal safe runs；Simultaneously again can when power system be short-circuited fault, the intensity of limiting short-circuit current, it is greatly reduced short trouble to the harm of electrical equipment in power system, after avoiding the requirement for meeting short circuit current maximum simultaneously, the contradiction of user side brownout under rated current.
Embodiment described above is only that the preferred embodiment of the present invention is described; not the scope of the present invention is defined; under the premise designing spirit without departing from the present invention; various deformation that technical scheme is made by those of ordinary skill in the art and improvement, all should fall in the protection domain that claims of the present invention is determined.
Claims (8)
1. a series compensation zero loss current limliting integral system, it is characterised in that: include the series compensation capacitor (1), current-limiting reactor (2), discharge prevention system, intelligent protection system and the intelligence control system that are arranged in power distribution cabinet；Described series compensation capacitor (1) is for compensating the induction reactance in circuit; described current-limiting reactor (2) is for the short circuit current in limiting circuit; described discharge prevention system is for discharging its electric energy after the protection of series compensation capacitor (1) short circuit; described intelligent protection system is used for protecting series compensation capacitor (1) not to be burned, and described intelligence control system is used for controlling the throwing of current-limiting reactor (2) and moves back.
2. series compensation zero loss current limliting integral system according to claim 1; it is characterized in that: described discharge prevention system includes current limliting antivibrator (3) and znr (4); the input of described current limliting antivibrator (3) is connected with the end of incoming cables of described series compensation capacitor (1), and the oxidized zinc nonlinear resistance (4) of its outfan is connected with the leading-out terminal of series compensation capacitor (1).
3. series compensation zero loss current limliting integral system according to claim 2, it is characterised in that: described current limliting antivibrator (3) is composed in parallel by inductance L and resistance R.
4. series compensation zero loss current limliting integral system according to claim 1; it is characterized in that: described intelligent protection system includes being connected in parallel on high-speed eddy switch (5) at series compensation capacitor (1) two ends, described high-speed eddy switch (5) controls it by the controller being arranged in power distribution cabinet and cut-offs.
5. series compensation zero loss current limliting integral system according to claim 4, it is characterised in that: described intelligent protection system also includes the bidirectional triode thyristor (6) being connected in parallel on series compensation capacitor (1) two ends.
6. series compensation zero loss current limliting integral system according to claim 1, it is characterized in that: described Based Intelligent Control system includes being connected in parallel on the branch switch (7) at current-limiting reactor (2) two ends, described branch switch (7) controls it by the controller being arranged in power distribution cabinet and cut-offs.
7. series compensation zero loss current limliting integral system according to claim 4, it is characterised in that: described high-speed eddy switch (5) is vacuum extinction chopper.
8. series compensation zero loss current limliting integral system according to claim 6, it is characterised in that: described branch switch (7) is vacuum extinction chopper.
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| CN201610248993.3A CN105790227A (en) | 2016-04-20 | 2016-04-20 | Series compensation zero-loss current limiting integrated system |
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| CN201610248993.3A CN105790227A (en) | 2016-04-20 | 2016-04-20 | Series compensation zero-loss current limiting integrated system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208106A (en) * | 2016-08-31 | 2016-12-07 | 丹东德元电力电器有限公司 | A kind of paralleling compensating device based on compensation/current-limiting reactor |
| CN106655132A (en) * | 2016-12-30 | 2017-05-10 | 安徽徽电科技股份有限公司 | Series compensation current-limiting integrated device |
| CN106786434A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of superconductive failure current limiter |
| CN106786442A (en) * | 2016-12-30 | 2017-05-31 | 安徽徽电科技股份有限公司 | A kind of LC series resonances current-limiting apparatus |
| CN106786435A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of short trouble current-limiting apparatus |
| CN106849102A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of mesohigh series compensation and depth current limiting system |
| CN106972502A (en) * | 2017-04-25 | 2017-07-21 | 安徽伊格瑞德电气设备有限公司 | A kind of series capacitor segmented compensation device |
| CN108133862A (en) * | 2018-01-19 | 2018-06-08 | 西安交通大学 | A kind of series compensation type current-limiting apparatus and method for interlocking vacuum switch and application |
| CN117498283A (en) * | 2023-10-26 | 2024-02-02 | 武汉大学 | Series resonance type current limiting device based on intelligent self-driving of short-circuit fault current |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208106A (en) * | 2016-08-31 | 2016-12-07 | 丹东德元电力电器有限公司 | A kind of paralleling compensating device based on compensation/current-limiting reactor |
| CN106208106B (en) * | 2016-08-31 | 2018-10-16 | 丹东德元电力电器有限公司 | A kind of paralleling compensating device based on compensation/current-limiting reactor |
| CN106786434A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of superconductive failure current limiter |
| CN106786435A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of short trouble current-limiting apparatus |
| CN106655132A (en) * | 2016-12-30 | 2017-05-10 | 安徽徽电科技股份有限公司 | Series compensation current-limiting integrated device |
| CN106786442A (en) * | 2016-12-30 | 2017-05-31 | 安徽徽电科技股份有限公司 | A kind of LC series resonances current-limiting apparatus |
| CN106849102A (en) * | 2017-03-02 | 2017-06-13 | 安徽伊格瑞德电气设备有限公司 | A kind of mesohigh series compensation and depth current limiting system |
| CN106972502A (en) * | 2017-04-25 | 2017-07-21 | 安徽伊格瑞德电气设备有限公司 | A kind of series capacitor segmented compensation device |
| CN108133862A (en) * | 2018-01-19 | 2018-06-08 | 西安交通大学 | A kind of series compensation type current-limiting apparatus and method for interlocking vacuum switch and application |
| CN108133862B (en) * | 2018-01-19 | 2024-03-26 | 西安交通大学 | Interlocking vacuum switch and series compensation type current limiting device and method applied by same |
| CN117498283A (en) * | 2023-10-26 | 2024-02-02 | 武汉大学 | Series resonance type current limiting device based on intelligent self-driving of short-circuit fault current |
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Application publication date: 20160720 |