CN111276954B - Self-adaptive fault current limiter - Google Patents
Self-adaptive fault current limiter Download PDFInfo
- Publication number
- CN111276954B CN111276954B CN202010153932.5A CN202010153932A CN111276954B CN 111276954 B CN111276954 B CN 111276954B CN 202010153932 A CN202010153932 A CN 202010153932A CN 111276954 B CN111276954 B CN 111276954B
- Authority
- CN
- China
- Prior art keywords
- current
- limiting resistor
- thyristor
- fault current
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02H9/023—Current limitation using superconducting elements
-
- 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
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention discloses a self-adaptationA fault current limiter comprises a superconducting fault current limiting resistor R connected in series between port 1 and port 2SFCLAnd a thyristor T1; anode connection superconducting fault current-limiting resistor R of thyristor T1SFCLCathode connection port 2; the inductor also comprises a coupling inductor, wherein the coupling inductor comprises inductor windings L1 and L2 with mutual inductance; an inductance winding L2 is connected between the port 1 and the port 2 after being connected with a capacitor C in series; the dotted terminal of the inductor winding L2 is connected with port 1, the unlike terminal is connected with one end of the capacitor C, and the other end of the capacitor C is connected with port 2; the inductance winding L1 is connected in series with the current-limiting resistor R and then connected in parallel to two ends of the thyristor T1; the synonym end of the inductance winding L1 is connected with the anode of the thyristor T1, the synonym end is connected with one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected with the cathode of the thyristor T1; the invention has low on-state loss, can automatically connect the current-limiting resistor and the inductor in series into a circuit when short-circuit fault occurs, and can effectively inhibit and reduce short-circuit fault current.
Description
Technical Field
The invention relates to the technical field of electrical equipment and electrical engineering, in particular to a self-adaptive fault current limiter.
Background
In recent years, with the emphasis of the country on environmental protection and the gradual depletion of non-renewable energy sources such as coal and petroleum in the world, the country has increased the degree of development and utilization of renewable clean energy sources. Clean energy projects such as offshore wind power generation in coastal areas to western solar power generation are steadily built in China, and the best mode for the distributed energy to carry out long-distance power transmission is high-voltage direct-current power transmission. However, because the line impedance of the direct current transmission system is low, when a short-circuit fault occurs to a line, the rising speed of the fault current is high, and the amplitude is high, the design of the high-voltage direct current circuit breaker becomes one of the main technical problems which hinder the development of high-voltage direct current transmission.
At present, in order to solve the technical problem that a high-voltage direct-current circuit breaker is difficult to break large fault current, a fault current limiter is often adopted to be matched with the circuit breaker to break the fault current. The fault current limiter can limit the development speed of direct current fault current, reduce the amplitude of the fault current, win response time for the on-off fault of the circuit breaker, and reduce the design difficulty of the circuit breaker.
The research of the direct current fault current limiter is still in a starting stage, and the on-state loss problem of the fault current limiter, the switching-in problem of the fault current limiter when a short-circuit fault occurs, the capability problem of limiting the fault current and the like cannot be effectively solved and are simultaneously considered. Therefore, the design technique of the dc fault current limiter still needs to be solved and perfected.
Disclosure of Invention
The invention provides a self-adaptive fault current limiter which has low on-state loss, can automatically connect a current-limiting resistor and an inductor in series into a circuit when a short-circuit fault occurs and can effectively inhibit and reduce the short-circuit fault circuit, aiming at the problems in the prior art.
The technical scheme adopted by the invention is as follows:
a self-adaptive fault current limiter comprises a superconducting fault current limiting resistor R connected between a port 1 and a port 2 in seriesSFCLAnd a thyristor T1; anode connection superconducting fault current-limiting resistor R of thyristor T1SFCL Cathode connection port 2; the inductor also comprises a coupling inductor, wherein the coupling inductor comprises inductor windings L1 and L2 with mutual inductance; an inductance winding L2 is connected between the port 1 and the port 2 after being connected with a capacitor C in series; the dotted terminal of the inductor winding L2 is connected with port 1, the unlike terminal is connected with one end of the capacitor C, and the other end of the capacitor C is connected with port 2; the inductance winding L1 is connected in series with the current-limiting resistor R and then connected in parallel to two ends of the thyristor T1; the synonym end of the inductance winding L1 is connected with the anode of the thyristor T1, the synonym end is connected with one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected with the cathode of the thyristor T1.
Further, the thyristor T1 is connected in parallel with a diode D1 in the reverse direction.
Further, the superconducting fault current limiting resistor RSFCLIs prepared from superconducting material.
The invention has the beneficial effects that:
(1) when a short-circuit fault occurs in the circuit, the inductor and the current-limiting resistor can be automatically put into the circuit, so that the increase of fault current is effectively inhibited, and time is gained for the response of the circuit breaker;
(2) according to the invention, the amplitude of the fault current can be effectively reduced through mutual coupling between the current-limiting resistor and the coupling inductor, the design capacity of the circuit breaker is reduced, and the difficulty and cost of the circuit breaker for cutting off the fault current are further reduced;
(3) when the circuit is normal, current flows through the superconducting fault current-limiting resistor and the thyristor which are in a superconducting state, and the on-state loss is low;
(4) the invention adopts the thyristor of the semi-controlled device, does not need a complex control circuit, has large rated current, high voltage-resistant grade and low price, does not need a fault detection circuit, and has simple structure and low cost.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a waveform diagram of a current-limiting simulation current according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in FIG. 1, an adaptive fault current limiter comprises a superconducting fault current limiting resistor R connected in series between a port 1 and a port 2SFCLAnd a thyristor T1; anode connection superconducting fault current-limiting resistor R of thyristor T1SFCL Cathode connection port 2; the inductor also comprises a coupling inductor, wherein the coupling inductor comprises inductor windings L1 and L2 with mutual inductance; an inductance winding L2 is connected between the port 1 and the port 2 after being connected with a capacitor C in series; the dotted terminal of the inductor winding L2 is connected with port 1, the unlike terminal is connected with one end of the capacitor C, and the other end of the capacitor C is connected with port 2; the inductance winding L1 is connected in series with the current-limiting resistor R and then connected in parallel to two ends of the thyristor T1; the synonym end of the inductance winding L1 is connected with the anode of the thyristor T1, the synonym end is connected with one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected with the cathode of the thyristor T1.
The thyristor T1 is connected in parallel with a diode D1 in the reverse direction, which can prevent the thyristor T1 from breaking down in the reverse direction. Superconducting fault current-limiting resistor RSFCLThe material is prepared by adopting a superconducting material, and the second generation high-temperature superconducting material produced by American AMSC is adopted in the embodiment, and the model is 8602; when the current flowing through it is within a certain rangeThe superconducting property is lost and the resistance is increased.
The current limiting simulation of the adaptive fault current limiter is carried out, and the waveform diagram of the current limiting simulation is shown in figure 2.
When the invention is used, when the line current is normal, the current flows from the superconducting fault current-limiting resistor R in the superconducting stateSFCLAnd the thyristor flows through, the on-state loss is low; t is t0A current limiting resistor R with short circuit fault, increased current and superconducting fault at any timeSFCLLoss of superconducting state, increase in resistance, RSFCLThe voltage across increases. Since the capacitor series inductor L2 is connected in parallel across it, the capacitor voltage increases and the capacitor charges. Because of the electromagnetic coupling relationship between the two windings L1 and L2 of the coupling inductor, induced electromotive force with the same name as the positive end is induced at the two ends of the winding L1 and is loaded at the two ends of the thyristor, and reverse current is formed and flows through the thyristor. The current flowing through the thyristor is forced to be zero, so that the thyristor is at t1At the moment of turning off, the fault current starts to flow from the coupling inductance winding L1 and the current limiting resistor R, and the amplitude of the fault current is reduced. As the fault current decreases, the voltage across the capacitor C begins to decrease and the charging current of the capacitor becomes a discharging current that flows through the synonym terminal of the coupling winding L2. Due to the electromagnetic coupling, the winding L1 will induce an induced electromotive force with the same name as the negative terminal, and generate an induced current with the direction opposite to the fault current, so as to further reduce the fault current, and at t2The fault current is reduced to the minimum at any moment, and conditions can be created for the circuit breaker to reliably cut off the fault current.
The self-adaptive fault current limiter disclosed by the invention can automatically put the inductor and the current-limiting resistor into a line when a short-circuit fault occurs in the line, effectively inhibits the increase of the fault current, gains time for the response of the circuit breaker, can effectively reduce the amplitude of the fault current through the mutual coupling between the current-limiting resistor and the coupling inductor, reduces the design capacity of the circuit breaker, and further reduces the difficulty and the cost for the circuit breaker to cut off the fault current. When the circuit is normal, the current flows through the superconducting fault current-limiting resistor R in a superconducting stateSFCLAnd thyristors, with low on-state losses. In addition, the invention adopts a thyristor of a semi-controlled device, and does not need complicated control electricityThe invention has the advantages of large rated current, high voltage-resistant grade, low price, simple structure and low cost, and does not need a fault detection circuit.
Claims (2)
1. An adaptive fault current limiter is characterized by comprising a superconducting fault current limiting resistor R connected between a port 1 and a port 2 in seriesSFCLAnd a thyristor T1; anode connection superconducting fault current-limiting resistor R of thyristor T1SFCLCathode connection port 2; the inductor also comprises a coupling inductor, wherein the coupling inductor comprises inductor windings L1 and L2 with mutual inductance; an inductance winding L2 is connected between the port 1 and the port 2 after being connected with a capacitor C in series; the dotted terminal of the inductor winding L2 is connected with port 1, the unlike terminal is connected with one end of the capacitor C, and the other end of the capacitor C is connected with port 2; the inductance winding L1 is connected in series with the current-limiting resistor R and then connected in parallel to two ends of the thyristor T1; the synonym end of the inductance winding L1 is connected with the anode of the thyristor T1, the synonym end is connected with one end of the current-limiting resistor R, and the other end of the current-limiting resistor R is connected with the cathode of the thyristor T1; the thyristor T1 is reversely connected with a diode D1 in parallel;
when flowing through the superconducting fault current-limiting resistor RSFCLWhen the current of (2) becomes large, the superconducting fault current limiting resistor RSFCLWill become larger, so that the superconducting fault current limiting resistor R will be largerSFCLThe voltage drop at the two ends is increased, so that the voltage of the capacitor C is increased, and the current charges the capacitor C through the inductance winding L2; because the inductance winding L2 has current passing through, because of magnetic coupling, the two ends of the inductance winding L1 can induce voltage with the same name end as positive, and the voltage is loaded on the two ends of the thyristor T1, so that the thyristor T1 is turned off; finally, current passes through the inductance winding L1 and the current-limiting resistor R to limit the increased current; meanwhile, as the fault current is reduced, the voltage of the capacitor C begins to be reduced, the charging current of the capacitor C becomes the discharging current, and flows out from the different name end of the inductance winding L2, because of the magnetic coupling, the voltage with the same name end as the voltage is induced at the two ends of the inductance winding L1, the induced current with the direction opposite to the fault current is generated, and the magnitude of the fault current is further reduced.
2. An adaptive fault current limit as defined in claim 1A current transformer characterized by said superconducting fault current limiting resistance RSFCLIs prepared from superconducting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153932.5A CN111276954B (en) | 2020-03-07 | 2020-03-07 | Self-adaptive fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010153932.5A CN111276954B (en) | 2020-03-07 | 2020-03-07 | Self-adaptive fault current limiter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111276954A CN111276954A (en) | 2020-06-12 |
| CN111276954B true CN111276954B (en) | 2021-07-09 |
Family
ID=71002395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010153932.5A Active CN111276954B (en) | 2020-03-07 | 2020-03-07 | Self-adaptive fault current limiter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111276954B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083232A (en) * | 1988-10-31 | 1992-01-21 | Asea Brown Boveri Ab | Fault current limiter |
| CN1391324A (en) * | 2002-06-27 | 2003-01-15 | 浙江大学 | Current limiter with by-pass inductor for short-circuit failure |
| CN101728812A (en) * | 2008-10-30 | 2010-06-09 | 韩国电力公社 | Line commutation type fault current limiter |
| CN106385018A (en) * | 2016-10-27 | 2017-02-08 | 华中科技大学 | Shortcircuit fault current limiter |
| CN106505514A (en) * | 2016-11-11 | 2017-03-15 | 西安交通大学 | Dc circuit breaker and its using method that magnetic induction transfer and resistance current limliting combine |
-
2020
- 2020-03-07 CN CN202010153932.5A patent/CN111276954B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083232A (en) * | 1988-10-31 | 1992-01-21 | Asea Brown Boveri Ab | Fault current limiter |
| CN1391324A (en) * | 2002-06-27 | 2003-01-15 | 浙江大学 | Current limiter with by-pass inductor for short-circuit failure |
| CN101728812A (en) * | 2008-10-30 | 2010-06-09 | 韩国电力公社 | Line commutation type fault current limiter |
| CN106385018A (en) * | 2016-10-27 | 2017-02-08 | 华中科技大学 | Shortcircuit fault current limiter |
| CN106505514A (en) * | 2016-11-11 | 2017-03-15 | 西安交通大学 | Dc circuit breaker and its using method that magnetic induction transfer and resistance current limliting combine |
Non-Patent Citations (1)
| Title |
|---|
| 直流故障限流器工作原理分析与特性研究;郝鑫等;《电网技术》;20191231;第43卷(第12期);第4414-4423页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111276954A (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3745440A1 (en) | Oscillating dc circuit breaker based on vacuum interupter with magnetic blow intergrated and breaking method thereof | |
| EP3343715B1 (en) | Short-circuit failure current limiter | |
| CN202333771U (en) | Power supply protection circuit and engineering machinery | |
| CN107834505B (en) | The artificial zero passage high voltage DC breaker of current-limiting type self-charging type and its cutoff method | |
| CN202150743U (en) | Coupling energy taking power supply system for high voltage transmission line fault monitoring | |
| CN103632895A (en) | Direct-current circuit breaker | |
| CN102005749B (en) | Current limiting device with flexible switch characteristic and current limiting method | |
| CN106300309A (en) | A kind of flexible direct current electric network fault current limiter with fast restoration capabilities | |
| CN102751710B (en) | Novel magnetic shielding air-core transformer coupling bridge type solid state fault current limiter | |
| CN102306933B (en) | Short-circuit current limiter with high reliability and method thereof | |
| CN110970880B (en) | Converter station containing RL type superconducting current limiter and DC circuit breaker and DC fault processing strategy thereof | |
| CN111276954B (en) | Self-adaptive fault current limiter | |
| WO2012092698A1 (en) | Device and method for limiting three-phase current | |
| CN112865055A (en) | Inductive coupling type direct current fault current limiter and control method thereof | |
| CN111276995A (en) | Power balancing device for offshore wind power flexible direct-delivery system and control method | |
| Heidary et al. | Wind energy generators fault Current protection: Structures survey | |
| CN112952846A (en) | Parallel high-speed switching type voltage sag treatment system | |
| CN203135428U (en) | Self-balanced electromagnetic and electronic fault current limiter | |
| Zhu et al. | A new hybrid DC circuit breaker topology | |
| CN201766546U (en) | Wind generating set protector for coping with voltage dip of power grid | |
| Mousavi et al. | A comprehensive review of DC fault Current limiters for DC Renewable energy generators | |
| CN213185500U (en) | Quick current limiting device based on SCR | |
| CN110048378A (en) | A kind of middle bipolar short-circuit protection method of pressure direct current distribution based on semi-bridge type MMC | |
| CN201118224Y (en) | Electrical power system short circuit fault current-limiting device | |
| CN201639282U (en) | Short circuit trouble current limiter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |