CN113612469B - Impedance matching device of electronic switch controllable self-recovery circuit - Google Patents
Impedance matching device of electronic switch controllable self-recovery circuit Download PDFInfo
- Publication number
- CN113612469B CN113612469B CN202110848555.1A CN202110848555A CN113612469B CN 113612469 B CN113612469 B CN 113612469B CN 202110848555 A CN202110848555 A CN 202110848555A CN 113612469 B CN113612469 B CN 113612469B
- Authority
- CN
- China
- Prior art keywords
- module
- switch
- impedance matching
- lightning arrester
- electronic switch
- 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
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/10—Modifications for increasing the maximum permissible switched voltage
- H03K17/105—Modifications for increasing the maximum permissible switched voltage in thyristor switches
-
- 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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K2017/515—Mechanical switches; Electronic switches controlling mechanical switches, e.g. relais
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to an impedance matching device of an electronic switch controllable self-recovery circuit, which comprises a lightning arrester module, a switch module and an impedance matching module, wherein the lightning arrester module and the switch module are connected between a high-voltage direct current positive bus and a high-voltage direct current negative bus, so as to realize impedance matching of the electronic switch controllable self-recovery circuit and provide a value condition of the impedance matching module. According to the impedance matching device of the controllable self-recovery circuit of the electronic switch, provided by the invention, through the circuit structure design of the impedance matching device, the impedance matching of the controllable self-recovery circuit of the electronic switch is realized, the additional problem that the charging rate of a controlled element of the lightning arrester is reduced due to the fact that the controlled element of the lightning arrester is connected with the electronic switch and a damping loop of the electronic switch in parallel, and then the charging rate of a fixed element of the lightning arrester is improved, the whole service life of the circuit is reduced is solved, the bearing ratio of the controlled element of the lightning arrester is improved, the service life of the fixed element of the lightning arrester is prolonged, and meanwhile, the problem that the thyristor of the thyristor trigger switch is subjected to thyristor-level energy taking is solved.
Description
Technical Field
The invention relates to the technical field of electric equipment of power systems, in particular to an impedance matching device of an electronic switch controllable self-recovery circuit.
Background
In an extra-high voltage direct current transmission system, the saturation characteristic of the air gap operation impulse discharge voltage is more remarkable, and the deep reduction of the operation overvoltage level plays a vital role in reducing the line air gap. The operating overvoltage drops from 1.7pu to 1.6pu and the transmission line air gap is reduced by 0.6m on average. In addition, the operation overvoltage level has a certain influence on the manufacturing difficulty of the power transmission and transformation equipment, so that the operation overvoltage multiple is necessary to be reduced deeply.
At present, 2 schemes are mainly adopted for reducing the operation overvoltage: the metal oxide arrester and the breaker are combined by 2 measures of additionally arranging a switching resistor. The combined action of the two can limit the maximum statistical operation overvoltage of 2% of the system to 1.6-1.7 pu. However, because the switching-on resistor still has a large defect in the aspects of operation reliability and economy, the mechanism is complex after the switching-on resistor is additionally arranged on the circuit breaker, the operation risk of the circuit breaker is greatly increased, meanwhile, the cost is increased more after the switching-on resistor is additionally arranged on the circuit breaker, and both an electric power system operation department and manufacturers tend to not adopt the switching-on resistor under the condition that the system condition allows.
When the line between 2 extra-high voltage substations is shorter, the rated voltage of the lightning arrester is reduced, and the system operation overvoltage can be limited to 1.6-1.7 pu. For example, if the extra-high voltage alternating current transmission line is 60km, and a breaker is not adopted and a switching resistor is not additionally arranged, only a metal oxide arrester is adopted, the rated voltage of the metal oxide arrester is required to be reduced from the current 828kV to 804kV (namely, the rated voltage is reduced by 3 percent), and the charging rate of the arrester is increased from the current 0.77 to 0.79. However, even if the rated voltage of the lightning arrester is reduced to 804kV, a longer line cannot meet the requirement. For example, when the length of an extra-high voltage alternating current transmission line is 85.5km, the lightning arrester with 804kV can only reduce the voltage of the overvoltage along the line to 1.74pu, the requirement still cannot be met, and the rated voltage of the lightning arrester must be reduced to be lower, even to 762kV (namely, the rated voltage is reduced by 8 percent) to meet the requirement. At this time, the long-term running charging rate of the lightning arrester is increased from 0.77 to 0.83, so that the ageing speed of the resistor disc of the lightning arrester under the normal running condition is increased, and the reliability margin is greatly reduced. Moreover, the precondition of using the 762kV lightning arrester is that the service conditions are extremely limited, namely, the power frequency overvoltage bus side of the system is 1.2pu, and the line side is 1.3 pu.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide an impedance matching device of an electronic switch controllable self-recovery circuit, which realizes the impedance matching of the electronic switch controllable self-recovery circuit through the circuit structure design of the impedance matching device, improves the bearing ratio of a controlled element, further improves the service life of a fixed element, and simultaneously solves the problem of thyristor-level energy taking of a thyristor trigger switch.
In order to achieve the above purpose, the invention provides an impedance matching device of an electronic switch controllable self-recovery circuit, which comprises a lightning arrester module and a switch module, wherein the lightning arrester module and the switch module are connected between a high-voltage direct current positive bus and a high-voltage direct current negative bus;
the lightning arrester module comprises a fixed element unit and a controlled element unit;
the switch module is connected with the controlled element unit in parallel, and is controlled to be switched on or off so as to perform switching operation on the controlled element unit;
the device also comprises an impedance matching module which is connected in parallel with the two ends of the fixed element unit to realize impedance matching.
Further, the fixed element unit comprises m-level lightning arrester groups connected in series, and the equivalent impedance of the lightning arrester groups is R g 。
Further, the controlled element unit comprises n-stage series-connected lightning arrester groups, and the equivalent impedance of the lightning arrester groups is R c 。
Further, the switch module includes an electronic switch unit, a mechanical switch unit, and a bypass switch unit.
Further, the electronic switch unit, the mechanical switch unit and the bypass switch unit are connected in parallel with each other.
Further, the electronic switch unit comprises j stages of electronic switches which are mutually connected in series.
Further, the electronic switch comprises a thyristor-triggered switch.
Further, the resistance value R of the impedance matching module 1 The following conditions are satisfied:
R 1 /R D ＝R g /R c
wherein R is D Is the equivalent impedance of the switch module.
Further, the resistance value R of the impedance matching module 1 The following conditions are satisfied:
(m(1+P 11 )/(n(1-P 12 ))-P 3 )*R 2 *j*(1+P 2 )≤R 1 ≤(m(1-P 11 )/(n(1+P 12 ))+P 3 )*R 2 *j*(1-P 2 )
wherein P is 11 For the non-equalizing coefficient, P of the fixed element arrester group 12 For the non-equalizing coefficient of the controlled element arrester group, R 2 Impedance, P, of single-stage electronic switch of electronic switch unit 2 Deviation limit value P of single-stage electronic switch of electronic switch unit 3 Is the impedance matching error of the lightning arrester module and the switch module. In summary, the present invention provides an impedance matching device of an electronic switch controllable self-recovery circuit, comprising a lightning arrester module connected between positive and negative buses of high voltage direct current andthe switching module and the impedance matching module are used for realizing the impedance matching of the electronic switch controllable self-recovery circuit and providing the value condition of the impedance matching module. According to the impedance matching device of the controllable self-recovery circuit of the electronic switch, provided by the invention, through the circuit structure design of the impedance matching device, the impedance matching of the controllable self-recovery circuit of the electronic switch is realized, the additional problem that the charging rate of a controlled element of the lightning arrester is reduced due to the fact that the controlled element of the lightning arrester is connected with the electronic switch and a damping loop of the electronic switch in parallel, and then the charging rate of a fixed element of the lightning arrester is improved, the whole service life of the circuit is reduced is solved, the bearing ratio of the controlled element of the lightning arrester is improved, the service life of the fixed element of the lightning arrester is prolonged, and meanwhile, the problem that the thyristor of the thyristor trigger switch is subjected to thyristor-level energy taking is solved.
Drawings
FIG. 1 is a schematic circuit diagram of an impedance matching device of an electronic switch controllable self-recovery circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an impedance matching model;
FIG. 3 is a graph of leakage current versus temperature for a 8500V/5500A thyristor at different voltages.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The technical scheme of the invention is described in detail below with reference to the accompanying drawings. According to one embodiment of the invention, an impedance matching device of a controllable self-recovery circuit of an electronic switch is provided, a schematic circuit diagram of the device is shown in fig. 1, and the device comprises a lightning arrester module and a switch module which are connected between a positive bus and a negative bus of high-voltage direct current. Wherein the lightning arrester module comprises a fixed element unit M1 and a controlled element unit M2, the fixed element unit M1 and the controlled element unit M2 are connected in series, and the fixed element unit M1One end is connected to the positive bus bar, the other end is connected to one end of the controlled element unit M2, and the other end of the controlled element unit M2 is connected to the negative bus bar. The fixed element unit M1 may for example comprise M-stage series-connected arrester groups with equivalent impedance R g The method comprises the steps of carrying out a first treatment on the surface of the The controlled element unit M2 may for example comprise n-stage series-connected arrester groups with equivalent impedance R c A natural number switching module, where M and n are both 1 or more, is connected in parallel with the controlled element unit M2, and the switching module receives, for example, a control signal of a control system to turn on or off so as to perform switching operation on the controlled element unit M2. The switch module comprises an electronic switch unit, a mechanical switch unit and a bypass switch unit, and the electronic switch unit, the mechanical switch unit and the bypass switch unit are connected in parallel. The electronic switching unit may include, for example, electronic switches of j stages connected in series with each other, j being a natural number of 1 or more, and may be determined according to an actual voltage level. The electronic switch may be, for example, a thyristor-triggered switch VT. The electronic switch further comprises a damping loop, e.g. resistors R and C1, connected in parallel thereto.
When the system runs in a steady state, the thyristor trigger switch, the quick mechanical switch and the bypass switch in the switch module are all in a switching-off state, and at the moment, the charging rate of the controlled element of the arrester is reduced due to the fact that the controlled element of the arrester is connected with the thyristor and the damping loop of the thyristor in parallel, so that the charging rate of the fixed element of the arrester is improved, and the overall service life of the energy dissipation device is reduced. In order to solve the problem of impedance matching, according to the embodiment of the invention, impedance matching is realized by connecting impedance matching modules in parallel at two ends of the lightning arrester fixing element unit M1 so as to ensure that parameters of a thyristor trigger switch do not influence a static voltage division relationship of the lightning arrester. Resistance R of the impedance matching module 1 The following conditions should be satisfied:
R 1 /R D ＝R g /R c
wherein R is D Is the equivalent impedance of the switch module.
In order to confirm specific parameters of the impedance matching module, the impedance ratio of the fixed element unit M1 to the controlled element unit M2 in the lightning arrester loop and the impedance characteristic of the thyristor trigger switch need to be analyzed and calculated, and a circuit structure schematic diagram of the impedance matching module is shown in fig. 2.
Let the non-equalizing coefficient of the fixed element arrester group be P 11 The non-equalizing coefficient of the controlled element lightning arrester group is P 12 The impedance ratio of the fixed element unit M1 to the controlled element unit M2 is K m ＝R g /R c The following steps are:
m(1-P 11 )/(n(1+P 12 ))≤K m ≤m(1+P 11 )/(n(1-P 12 )) (1)
let R be D Is the equivalent impedance of the switch module. In the off state, the impedance of the mechanical switch unit and the bypass switch unit is far greater than the impedance of the electronic switch, R D The electronic switch impedance can be directly used, wherein the electronic switch is formed by serially connecting j-stage electronic module units, and the impedance of a single-stage module is R 2 Deviation limit value P 2 The following steps are:
R 2 *j*(1-P 2 )≤R D ≤R 2 *j*(1+P 2 ) (2)
impedance ratio of the switch module:
K d ＝R 1 /R D (3)
the impedance matching error limit value of the lightning arrester module and the switch module is P 3 The following steps are:
|K d -K m |≤P 3
it can be derived that:
K m -P 3 ≤K d ≤K m +P 3 (4)
if R is 1 The value range of (2) is that min is not less than R 1 And less than or equal to max, can be obtained by the formulas (2), (3) and (4):
min/(R 2 *j*(1+P 2 ))≥K m -P 3
max/(R 2 *j*(1-P 2 ))≥K m +P 3
then
min≥(K m -P 3 )*R 2 *j*(1+P 2 ) (5)
max≤(K m +P 3 )*R 2 *j*(1-P 2 ) (6)
The impedance range of R1 can be derived from formulas (1) (5) and (1) (6)
(m(1+P 11 )/(n(1-P 12 ))-P 3 )*R 2 *j*(1+P 2 )≤R 1 ≤(m(1-P 11 )/(n(1+P 12 ))+P 3 )*R 2 *j*(1-P 2 )
Wherein P is 11 For the non-equalizing coefficient, P of the fixed element arrester group 12 For the non-equalizing coefficient of the controlled element arrester group, R 2 Impedance, P, of single-stage electronic switch of electronic switch unit 2 Deviation limit value P of single-stage electronic switch of electronic switch unit 3 Is the impedance matching error of the lightning arrester module and the switch module.
Further description will be given below of a specific embodiment. In this embodiment, 88 pieces of the resistor sheets of the arrester fixing element unit M1 are connected in series, 19 pieces of the resistor sheets of the arrester controlled element unit M2 are connected in series, and the impedance ratio of the fixing element unit M1 to the controlled element unit M2 is 4.63. The electronic switch unit is composed of 24-level thyristors in series, the thyristor trigger switch is a thyristor of 8500V/5500A, and the DC equalizing resistance R2 is 300kΩ. The relationship between leakage current and temperature of 8500V/5500A thyristor under different voltages is shown in figure 3, and the typical off-state impedance of the thyristor is shown in table 1 by accounting with 3.675kV of the end voltage of the thyristor.
TABLE 1
| Ambient temperature | Single stage thyristor impedance |
| 20℃ | 50MΩ |
| 40℃ | 20MΩ |
| 50℃ | 8MΩ |
The direct current equalizing resistance R2 = 300k omega of the thyristor trigger switch, the off-state impedance of the thyristor is far greater than that of the direct current equalizing resistance R2, and the impedance of the RC damping loop is also far greater than that of the direct current equalizing resistance 300k omega in direct current, so that the equivalent impedance of the thyristor trigger switch is 300k omega x 24 = 7.2M omega in the off-state.
Therefore, to maintain the voltage ratio of the fixed element unit M1 and the controlled element unit M2 at about 4.63, the resistance R of the impedance matching module 1 33.3mΩ. Setting P in consideration of surge arrester non-equalizing coefficient 1 ＝0.001，R 2 Deviation limit P of (2) 2 Impedance match error limit P for arrester and switch modules =0.002 3 =0.05, then R 1 The range of the values is as follows:
33.12MΩ≤R 1 ≤33.57MΩ。
in summary, the invention relates to an impedance matching device of an electronic switch controllable self-recovery circuit, which comprises a lightning arrester module, a switch module and an impedance matching module, wherein the lightning arrester module and the switch module are connected between a high-voltage direct current positive bus and a high-voltage direct current negative bus, so as to realize impedance matching of the electronic switch controllable self-recovery circuit, and provide a value condition of the impedance matching module. According to the impedance matching device of the controllable self-recovery circuit of the electronic switch, provided by the invention, through the circuit structure design of the impedance matching device, the impedance matching of the controllable self-recovery circuit of the electronic switch is realized, the additional problem that the charging rate of a controlled element of the lightning arrester is reduced due to the fact that the controlled element of the lightning arrester is connected with the electronic switch and a damping loop of the electronic switch in parallel, and then the charging rate of a fixed element of the lightning arrester is improved, the whole service life of the circuit is reduced is solved, the bearing ratio of the controlled element of the lightning arrester is improved, the service life of the fixed element of the lightning arrester is prolonged, and meanwhile, the problem that the thyristor of the thyristor trigger switch is subjected to thyristor-level energy taking is solved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (7)
1. The impedance matching device of the electronic switch controllable self-recovery circuit is characterized by comprising a lightning arrester module and a switch module, wherein the lightning arrester module and the switch module are connected between a high-voltage direct current positive bus and a high-voltage direct current negative bus;
the lightning arrester module comprises a fixed element unit and a controlled element unit;
the switch module is connected with the controlled element unit in parallel, and is controlled to be switched on or off so as to perform switching operation on the controlled element unit;
the impedance matching module is connected in parallel with the two ends of the fixed element unit to realize impedance matching;
resistance value R of the impedance matching module 1 The following conditions are satisfied:
R 1 /R D ＝R g /R c
wherein R is D Is the equivalent impedance of the switch module;
resistance value R of the impedance matching module 1 The following conditions are satisfied:
(m(1+P 11 )/(n(1-P 12 ))-P 3 )*R 2 *j*(1+P 2 )≤R 1 ≤(m(1-P 11 )/(n(1+P 12 ))+P 3 )*R 2 *j*(1-P 2 )
wherein P is 11 For the non-equalizing coefficient, P of the fixed element arrester group 12 For the non-equalizing coefficient of the controlled element arrester group, R 2 Single-stage electronic switch for electronic switch unitImpedance of switch, P 2 Deviation limit value P of single-stage electronic switch of electronic switch unit 3 Is the impedance matching error of the lightning arrester module and the switch module.
2. The device according to claim 1, wherein the fixed element unit comprises m-stage series-connected lightning arrester groups with equivalent impedance R g 。
3. The device according to claim 2, wherein the controlled element unit comprises n-stage series-connected lightning arrester groups having an equivalent impedance R c 。
4. A device according to claim 3, wherein the switching module comprises an electronic switching unit, a mechanical switching unit and a bypass switching unit.
5. The device of claim 4, wherein the electronic switch unit, the mechanical switch unit and the bypass switch unit are connected in parallel with each other.
6. The apparatus of claim 5, wherein the electronic switching unit comprises j stages of electronic switches connected in series with each other.
7. The apparatus of claim 6, wherein the electronic switch comprises a thyristor-triggered switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110848555.1A CN113612469B (en) | 2021-07-27 | 2021-07-27 | Impedance matching device of electronic switch controllable self-recovery circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110848555.1A CN113612469B (en) | 2021-07-27 | 2021-07-27 | Impedance matching device of electronic switch controllable self-recovery circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113612469A CN113612469A (en) | 2021-11-05 |
| CN113612469B true CN113612469B (en) | 2024-02-09 |
Family
ID=78305486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110848555.1A Active CN113612469B (en) | 2021-07-27 | 2021-07-27 | Impedance matching device of electronic switch controllable self-recovery circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113612469B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4414599A (en) * | 1981-03-24 | 1983-11-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Arrester and a semiconductor circuit arrangement with a protection device including the same |
| CN108667001A (en) * | 2018-05-18 | 2018-10-16 | 中国电力科学研究院有限公司 | A kind of 110kV thyristors valve-type controllable arrester device and verification method |
| WO2020233180A1 (en) * | 2019-05-21 | 2020-11-26 | 南京南瑞继保电气有限公司 | Current-limiting controllable lightning arrester, converter, power transmission system, and control method |
| CN112217482A (en) * | 2020-08-31 | 2021-01-12 | 湖南大学 | Electroacoustic transducer system and impedance matching control method thereof |
| CN112769114A (en) * | 2020-12-30 | 2021-05-07 | 中国电力科学研究院有限公司 | Method for selecting parameters of thyristor valve in controllable arrester |
-
2021
- 2021-07-27 CN CN202110848555.1A patent/CN113612469B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4414599A (en) * | 1981-03-24 | 1983-11-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Arrester and a semiconductor circuit arrangement with a protection device including the same |
| CN108667001A (en) * | 2018-05-18 | 2018-10-16 | 中国电力科学研究院有限公司 | A kind of 110kV thyristors valve-type controllable arrester device and verification method |
| WO2020233180A1 (en) * | 2019-05-21 | 2020-11-26 | 南京南瑞继保电气有限公司 | Current-limiting controllable lightning arrester, converter, power transmission system, and control method |
| CN112217482A (en) * | 2020-08-31 | 2021-01-12 | 湖南大学 | Electroacoustic transducer system and impedance matching control method thereof |
| CN112769114A (en) * | 2020-12-30 | 2021-05-07 | 中国电力科学研究院有限公司 | Method for selecting parameters of thyristor valve in controllable arrester |
Non-Patent Citations (1)
| Title |
|---|
| 一种适用于多电源电压IO的阻抗匹配结构;罗尧宇;孙长江;许迪;;电脑与电信(11);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113612469A (en) | 2021-11-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112491255B (en) | Voltage-sharing circuit, flying capacitor three-level converter and equipment | |
| CN108899853B (en) | Live-line ice melting topological system and ice melting method thereof | |
| CN111030158B (en) | Energy consumption branch circuit for preventing direct-current side overvoltage of direct-current power transmission system and control method | |
| CN113612469B (en) | Impedance matching device of electronic switch controllable self-recovery circuit | |
| CN109842108B (en) | Multi-path heavy-current power supply grid-connected reverse-filling-prevention power distribution device | |
| CN109327016B (en) | Direct-current interelectrode breaking device and control method | |
| CN113037112B (en) | ANPC type three-level inverter, control method and power system | |
| US9667162B2 (en) | Transformer connection apparatus | |
| CN111244926B (en) | Controllable lightning arrester capable of being used for mixed direct current transmission | |
| WO2018214263A1 (en) | Power supply protection device, battery energy storage system and electrical equipment | |
| CN113760028B (en) | Energy taking power supply and energy taking method of flexible and straight submodule | |
| CN111987705A (en) | Direct current energy consumption system, electric power system and energy consumption method | |
| CN115459240A (en) | Redundant microcomputer power supply for locomotive | |
| CN210380245U (en) | Direct current energy consumption system and electric power system | |
| CN220210268U (en) | Energy storage converter | |
| CN214543612U (en) | Lightning arrester for direct current | |
| CN219554820U (en) | Surge protection circuit of frequency converter | |
| WO2024139945A1 (en) | Photovoltaic inversion system and lightning protection device | |
| CN110445111B (en) | Magnetic control type shunt reactor control winding direct current bus overvoltage protection system | |
| CN208094184U (en) | Current surge suppression circuit | |
| CN219760641U (en) | Power supply apparatus | |
| CN214372531U (en) | Diaphragm capsule contact sensor | |
| CN216413919U (en) | Direct current combined electrical apparatus suitable for direct current electric power system | |
| CN218514093U (en) | Wide voltage output circuit of parallel power supply | |
| WO2022110995A1 (en) | Switch quantity output circuit, circuit board assembly and electronic device |
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 |