CN112952784B - Excitation variable overload limiter applicable to flexible excitation system - Google Patents
Excitation variable overload limiter applicable to flexible excitation system Download PDFInfo
- Publication number
- CN112952784B CN112952784B CN202110210127.6A CN202110210127A CN112952784B CN 112952784 B CN112952784 B CN 112952784B CN 202110210127 A CN202110210127 A CN 202110210127A CN 112952784 B CN112952784 B CN 112952784B
- Authority
- CN
- China
- Prior art keywords
- excitation
- overload
- variable
- flexible
- transformer
- 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
- 230000005284 excitation Effects 0.000 title claims abstract description 231
- 230000000670 limiting effect Effects 0.000 claims abstract description 49
- 230000009471 action Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims abstract description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 28
- 238000004804 winding Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses an excitation variable overload limiter applicable to a flexible excitation system. The excitation-variable overload limiter comprises an excitation-variable overload signal detection circuit, an excitation-variable overload state judgment circuit and an excitation-variable overload action circuit; the excitation transformer overload signal detection circuit is used for detecting a signal of the load running state of the excitation transformer and transmitting the signal to the excitation transformer overload state judgment circuit; the excitation-variable overload state judging circuit calculates and judges whether the excitation transformer exceeds the overload running state allowed by the equipment by using the detected signal to obtain an excitation-variable overload limiting action signal, and transmits the excitation-variable overload limiting action signal to the excitation-variable overload action circuit; the excitation variable overload action loop controls a control process variable of the flexible excitation system. The invention limits the running state of the exciting transformer within the overload running range allowed by the equipment while exerting the strong exciting capability of the flexible exciting system.
Description
Technical Field
The invention belongs to the field of generator excitation systems, and particularly relates to an excitation variable overload limiter applicable to a flexible excitation system.
Background
In recent years, the power grid faces the development challenges of high-proportion clean energy and double high of high-proportion power electronic devices, the safe and stable operation pressure is greatly increased, and the elastic adjustment capability of the power system for coping with extreme risks is urgently improved under new situations. After the conventional generator set is replaced by new energy in a large quantity, the stable supporting capacity of the power grid is reduced, the running risk of the power grid is increased, and the control means are deficient. The solution to the above problems is that if measures are taken in a primary system, the difficulty is high, and if the measures can be realized by improving the excitation control system and the control strategy of the large synchronous generator, the effect will be more remarkable, and the cost is also greatly reduced.
At present, the conventional generator excitation system is realized based on a semi-controlled device thyristor rectification mode, and only the device can be controlled to be turned on and off uncontrollably, so that the conventional excitation system can only control the generator excitation voltage through phase control step-down rectification, and when the power grid voltage drops, the top value forced excitation output capacity of the generator set is limited, so that the voltage stability control of a high-proportion new energy power grid is not facilitated. The flexible excitation device adopts the full-control power electronic device IGBT to innovate a topological structure and a control method, and achieves the essential improvement of the performance of the generator excitation system, which relates to the stable control core equipment of the power grid, from the bottom layer.
However, when the flexible excitation device formed by the AC-DC and DC-DC power conversion loops based on the IGBT elements is applied to a power generation excitation system, the existing limiting control function of conventional excitation cannot completely cover the safe operation requirement of a new topology excitation system because the flexible excitation has the capability of actively improving the strong excitation. Under the strong excitation state of the excitation system, the conventional excitation can only carry out buck rectification control, and the excitation variable alternating current and the rotor side direct current are almost in linear direct proportion, so that the overload problem of the excitation variable can be equivalently limited only through a rotor over-excitation limiter. However, the flexible excitation has a boost excitation function, and the excitation variable current is inversely proportional to the machine end voltage in the forced excitation state and does not maintain a linear proportional relationship with the rotor current, so that the overload operation state of the excitation variable cannot be limited and protected by the original overexcitation limiter.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide the excitation variable overload limiter applicable to the flexible excitation system, which can limit the running state of the excitation transformer within the overload running range allowed by equipment while exerting the dynamic strong excitation capability of the flexible excitation system.
In order to achieve the above purpose, the invention adopts the following technical scheme: the excitation variable overload limiter is applicable to a flexible excitation system, and the flexible excitation system comprises a flexible excitation power unit and a flexible excitation control unit;
the flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, and the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the front-stage bidirectional alternating current-direct current converter is the input side of a flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating-current low-voltage side of the excitation transformer, and the three-phase alternating-current high-voltage side of the excitation transformer is connected with the generator end; the output side of the flexible excitation power unit is connected with the excitation winding of the generator;
The flexible excitation control unit comprises an excitation variable overload limiter, and the excitation variable overload limiter comprises an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit; the excitation variable overload signal detection circuit is used for detecting a signal of the load running state of the excitation transformer and transmitting the signal to the excitation variable overload state judgment circuit; the excitation overload state judging circuit calculates and judges whether the excitation overload exceeds the overload running state allowed by the equipment by using the detected signal to obtain an excitation overload limiting action signal, and transmits the excitation overload limiting action signal to the excitation overload action circuit; after receiving the excitation overload limiting action signal, the excitation overload action loop limits the running state of the excitation transformer within the overload running range allowed by the equipment by controlling the control process variable of the flexible excitation system.
The excitation transformer overload refers to excitation transformer overload operation exceeding rated load, and the excitation transformer overload operation range can be characterized by an operation current and a corresponding allowed operation time, wherein the operation current and the allowed operation time generally show inverse time limit characteristics, and can also be characterized by an excitation transformer maximum allowed operation temperature.
Further, the exciting transformer temperature is obtained by the exciting transformer overload signal detection loop through a temperature measuring device; and the excitation overload state judging circuit obtains an excitation overload limiting action signal by comparing the temperature of the excitation transformer with the overheat fixed value of the temperature of the excitation transformer.
Further, the exciting transformer current is obtained by the exciting transformer overload signal detection loop through a current measuring device; and the excitation variable overload state judging loop calculates the accumulated heat of the excitation variable winding through the current of the excitation transformer, and compares the accumulated heat with the overload heat fixed value of the excitation variable winding to obtain an excitation variable overload limiting action signal.
Further, when the excitation-to-overload limiting action signal occurs, the excitation-to-overload action loop acts on reducing the excitation voltage output amplitude limit of the rear-stage bidirectional DC-DC converter, and adjusts in real time according to the following formula: the excitation voltage output limiting = limiting action conservation coefficient x the per unit value of the end voltage x the rated voltage of the excitation transformer secondary side x the rated current of the excitation transformer secondary side ≡excitation current actual measurement value.
Further, when the excitation-variable overload limiting action signal occurs, the excitation-variable overload action loop acts to reduce the current limiting of the input link of the front-stage bidirectional AC-DC converter, and limits according to the following formula: the current limiting=the limiting action conservation coefficient×the excitation transformer secondary side rated current.
The invention has the following beneficial effects: the excitation variable overload limiter provided by the invention can fully exert the capability of the flexible excitation system Gao Jiangli, limit the running state of the excitation transformer within the overload running range allowed by equipment, improve the defect of the existing excitation limiting control and effectively protect the excitation transformer.
Drawings
Fig. 1 is a control block diagram of an excitation variable overload limiter adapted for use in a flexible excitation system in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the scope of the present invention is not limited to the following examples. Any modifications and variations made to the present invention fall within the spirit of the invention and the scope of the appended claims.
Example 1
An excitation variable overload limiter applicable to a flexible excitation system is shown in fig. 1, and the flexible excitation system comprises a flexible excitation power unit and a flexible excitation control unit.
The flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, and the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the front-stage bidirectional alternating current-direct current converter is the input side of a flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating-current low-voltage side of the excitation transformer, and the three-phase alternating-current high-voltage side of the excitation transformer is connected with the generator end; the output side of the flexible excitation power unit is connected with the excitation winding of the generator.
The flexible excitation control unit comprises an excitation variable overload limiter, and limits and controls excitation current within an overload operation range allowed by equipment;
The excitation variable overload limiter consists of an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit;
The excitation transformer temperature is obtained by the excitation variable overload signal detection loop through a temperature measuring device; and the excitation overload state judging circuit obtains an excitation overload limiting action signal by comparing the temperature of the excitation transformer with the overheat fixed value of the temperature of the excitation transformer.
When the excitation overload limiting action signal occurs, the excitation overload limiting action loop acts on the reduction of the excitation voltage output amplitude limitation of the rear-stage bidirectional DC-DC converter, and is adjusted in real time according to the following formula: excitation voltage output limiting = limiting action conservation coefficient x machine side voltage per unit value x excitation transformer secondary side rated voltage x excitation transformer secondary side rated current/(excitation current actual measurement value), wherein the limiting action conservation coefficient can be set according to 0.8-0.9.
Example 2
An excitation variable overload limiter applicable to a flexible excitation system according to the present embodiment has a control block diagram similar to that of example 1, as shown in fig. 1.
The excitation variable overload limiter consists of an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit;
The excitation transformer temperature is obtained by the excitation variable overload signal detection loop through a temperature measuring device; and the excitation overload state judging circuit obtains an excitation overload limiting action signal by comparing the temperature of the excitation transformer with the overheat fixed value of the temperature of the excitation transformer.
When the excitation overload limiting action signal occurs, the excitation overload limiting action loop can also act to reduce the current limiting of the input link of the front-stage bidirectional AC-DC converter, and the limiting is carried out according to the following formula: three-phase ac input current limiter = limited action conservative factor x excitation transformer secondary side rated current, wherein the limited action conservative factor can be set at 0.8 to 0.9.
Example 3
An excitation variable overload limiter applicable to a flexible excitation system according to the present embodiment has a control block diagram similar to that of example 1, as shown in fig. 1.
The excitation variable overload limiter consists of an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit;
The exciting transformer overload signal detection circuit obtains exciting transformer current through a current measuring device; and the excitation variable overload state judging loop calculates the accumulated heat of the excitation variable winding through the current of the excitation transformer, and compares the accumulated heat with the overload heat fixed value of the excitation variable winding to obtain an excitation variable overload limiting action signal.
When the excitation overload limiting action signal occurs, the excitation overload limiting action loop acts on the reduction of the excitation voltage output amplitude limitation of the rear-stage bidirectional DC-DC converter, and is adjusted in real time according to the following formula: excitation voltage output limiting = limiting action conservation coefficient x machine side voltage per unit value x excitation transformer secondary side rated voltage x excitation transformer secondary side rated current/(excitation current actual measurement value), wherein the limiting action conservation coefficient can be set according to 0.8-0.9.
Example 4
An excitation variable overload limiter applicable to a flexible excitation system according to the present embodiment has a control block diagram similar to that of example 1, as shown in fig. 1.
The excitation variable overload limiter consists of an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit;
The exciting transformer overload signal detection circuit obtains exciting transformer current through a current measuring device; and the excitation variable overload state judging circuit calculates the accumulated heat of the excitation variable winding through the excitation variable current, and compares the accumulated heat with the overload heat constant value of the excitation variable winding to obtain an excitation variable overload limiting action signal.
When the excitation-to-overload limiting action signal occurs, the excitation-to-overload action loop can act to reduce the current limiting of the input link of the front-stage bidirectional AC-DC converter, and the limiting is carried out according to the following formula: three-phase ac input current limiter = limited action conservative factor x excitation transformer secondary side rated current, wherein the limited action conservative factor can be set at 0.8 to 0.9.
Claims (3)
1. The excitation variable overload limiter is suitable for a flexible excitation system and is characterized in that the flexible excitation system comprises a flexible excitation power unit and a flexible excitation control unit;
the flexible excitation power unit comprises a two-stage circuit of a front-stage bidirectional alternating current-direct current converter and a rear-stage bidirectional direct current-direct current converter, and the front-stage bidirectional alternating current-direct current converter is connected with the rear-stage bidirectional direct current-direct current converter through an intermediate direct current capacitor loop; the three-phase alternating current input side of the front-stage bidirectional alternating current-direct current converter is the input side of a flexible excitation power unit; the direct current output side of the rear-stage bidirectional direct current-direct current converter is the output side of the flexible excitation power unit; the input side of the flexible excitation power unit is connected with the three-phase alternating-current low-voltage side of the excitation transformer, and the three-phase alternating-current high-voltage side of the excitation transformer is connected with the generator end; the output side of the flexible excitation power unit is connected with the excitation winding of the generator;
The flexible excitation control unit comprises an excitation variable overload limiter, and the excitation variable overload limiter comprises an excitation variable overload signal detection circuit, an excitation variable overload state judgment circuit and an excitation variable overload action circuit; the excitation variable overload signal detection circuit is used for detecting a signal of the load running state of the excitation transformer and transmitting the signal to the excitation variable overload state judgment circuit; the excitation overload state judging circuit calculates and judges whether the excitation overload exceeds the overload running state allowed by the equipment by using the detected signal to obtain an excitation overload limiting action signal, and transmits the excitation overload limiting action signal to the excitation overload action circuit; after receiving the excitation-to-overload limiting action signal, the excitation-to-overload action loop limits the running state of the excitation transformer within the overload running range allowed by the equipment by controlling the control process variable of the flexible excitation system;
When the excitation overload limiting action signal occurs, the excitation overload limiting action loop acts on the reduction of excitation voltage output amplitude limitation of the rear-stage bidirectional DC-DC converter or current amplitude limitation of the input link of the front-stage bidirectional AC-DC converter;
The excitation-to-overload action loop acts on reducing excitation voltage output amplitude limitation of the rear-stage bidirectional DC-DC converter, and is adjusted in real time according to the following formula: the excitation voltage output limiting = limiting action conservation coefficient x the per unit value of the end voltage of the machine x the rated voltage of the excitation transformer secondary side x the rated current of the excitation transformer secondary side ≡excitation current actual measurement value;
The excitation-to-overload action loop acts on the current limiting of the input link of the pre-stage bidirectional AC-DC converter, and limits according to the following formula: the current limiting=the limiting action conservation coefficient×the excitation transformer secondary side rated current.
2. An excitation variable overload limiter adapted for use in a flexible excitation system as claimed in claim 1 wherein,
The excitation transformer temperature is obtained by the excitation variable overload signal detection loop through a temperature measuring device; and the excitation overload state judging circuit obtains an excitation overload limiting action signal by comparing the temperature of the excitation transformer with the overheat fixed value of the temperature of the excitation transformer.
3. An excitation variable overload limiter adapted for use in a flexible excitation system as claimed in claim 1 wherein,
The exciting transformer overload signal detection circuit obtains exciting transformer current through a current measuring device; and the excitation variable overload state judging loop calculates the accumulated heat of the excitation variable winding through the current of the excitation transformer, and compares the accumulated heat with the overload heat fixed value of the excitation variable winding to obtain an excitation variable overload limiting action signal.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110210127.6A CN112952784B (en) | 2021-02-24 | 2021-02-24 | Excitation variable overload limiter applicable to flexible excitation system |
| PCT/CN2021/078062 WO2021170074A1 (en) | 2020-02-26 | 2021-02-26 | Flexible excitation system and control method therefor |
| US17/896,714 US20220407316A1 (en) | 2020-02-26 | 2022-08-26 | Flexible excitation system and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110210127.6A CN112952784B (en) | 2021-02-24 | 2021-02-24 | Excitation variable overload limiter applicable to flexible excitation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112952784A CN112952784A (en) | 2021-06-11 |
| CN112952784B true CN112952784B (en) | 2024-05-10 |
Family
ID=76246083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110210127.6A Active CN112952784B (en) | 2020-02-26 | 2021-02-24 | Excitation variable overload limiter applicable to flexible excitation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112952784B (en) |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707467A (en) * | 2009-12-01 | 2010-05-12 | 国电南瑞科技股份有限公司 | Flexible electric braking method of large-sized water turbine generator |
| CN102064757A (en) * | 2010-12-24 | 2011-05-18 | 中国长江三峡集团公司 | Generator accident reinforced excitation circuit |
| CN103281024A (en) * | 2013-04-22 | 2013-09-04 | 广东电网公司电力科学研究院 | Alternating current excitation system based on full control device |
| CN103516274A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Generator excitation system comprising multi-type limiting units |
| CN104377730A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Energy storage type excitation frequency converter used for variable-speed constant-frequency double-fed wind power generation system |
| CN104614616A (en) * | 2015-02-05 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Match detection method and device of generator-transformer unit protection setting value and excitation limiter setting value |
| CN104702186A (en) * | 2014-11-27 | 2015-06-10 | 南京航空航天大学 | Hybrid excitation type variable frequency AC starting generating system and control method thereof |
| CN104730936A (en) * | 2015-03-05 | 2015-06-24 | 国家电网公司 | Electromechanical transient model actual measuring and modeling method for nuclear power unit 39-phase self-excitation brushless excitation system |
| CN107482941A (en) * | 2017-08-25 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of five level DCs translation circuit and the generator excited system comprising the circuit |
| CN107622176A (en) * | 2017-11-02 | 2018-01-23 | 大唐彬长发电有限责任公司 | The verification method of stator overload protection and exciting current limitation matching relationship |
| CN107677879A (en) * | 2017-10-17 | 2018-02-09 | 大唐韩城第二发电有限责任公司 | G-T protective and the detection method and device of generator amature overload |
| CN107834922A (en) * | 2017-11-08 | 2018-03-23 | 华北电力科学研究院有限责任公司 | A kind of condition control method and device of the limitation of field regulator stator current |
| CN108631669A (en) * | 2018-04-26 | 2018-10-09 | 国网浙江省电力有限公司电力科学研究院 | A kind of three level DC translation circuit that neutral point voltage is controllable and its control method |
| CN109104128A (en) * | 2018-07-27 | 2018-12-28 | 西安许继电力电子技术有限公司 | A kind of control method and system of AC excitation system converter multiple module paralleling |
| CN110880892A (en) * | 2019-11-05 | 2020-03-13 | 武汉武水电气技术有限责任公司 | Control system of excitation adjusting device |
| CN111181175A (en) * | 2020-01-10 | 2020-05-19 | 广西大学 | Excitation system based on cooperative control theory and stabilization method thereof |
| CN111277002A (en) * | 2020-03-19 | 2020-06-12 | 国网浙江省电力有限公司电力科学研究院 | Flexible excitation power unit parallel topology structure and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8030788B2 (en) * | 2008-12-31 | 2011-10-04 | General Electric Company | Method and systems for an engine starter/generator |
-
2021
- 2021-02-24 CN CN202110210127.6A patent/CN112952784B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707467A (en) * | 2009-12-01 | 2010-05-12 | 国电南瑞科技股份有限公司 | Flexible electric braking method of large-sized water turbine generator |
| CN102064757A (en) * | 2010-12-24 | 2011-05-18 | 中国长江三峡集团公司 | Generator accident reinforced excitation circuit |
| CN103281024A (en) * | 2013-04-22 | 2013-09-04 | 广东电网公司电力科学研究院 | Alternating current excitation system based on full control device |
| CN103516274A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Generator excitation system comprising multi-type limiting units |
| CN104377730A (en) * | 2014-11-21 | 2015-02-25 | 国家电网公司 | Energy storage type excitation frequency converter used for variable-speed constant-frequency double-fed wind power generation system |
| CN104702186A (en) * | 2014-11-27 | 2015-06-10 | 南京航空航天大学 | Hybrid excitation type variable frequency AC starting generating system and control method thereof |
| CN104614616A (en) * | 2015-02-05 | 2015-05-13 | 华北电力科学研究院有限责任公司 | Match detection method and device of generator-transformer unit protection setting value and excitation limiter setting value |
| CN104730936A (en) * | 2015-03-05 | 2015-06-24 | 国家电网公司 | Electromechanical transient model actual measuring and modeling method for nuclear power unit 39-phase self-excitation brushless excitation system |
| CN107482941A (en) * | 2017-08-25 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of five level DCs translation circuit and the generator excited system comprising the circuit |
| CN107677879A (en) * | 2017-10-17 | 2018-02-09 | 大唐韩城第二发电有限责任公司 | G-T protective and the detection method and device of generator amature overload |
| CN107622176A (en) * | 2017-11-02 | 2018-01-23 | 大唐彬长发电有限责任公司 | The verification method of stator overload protection and exciting current limitation matching relationship |
| CN107834922A (en) * | 2017-11-08 | 2018-03-23 | 华北电力科学研究院有限责任公司 | A kind of condition control method and device of the limitation of field regulator stator current |
| CN108631669A (en) * | 2018-04-26 | 2018-10-09 | 国网浙江省电力有限公司电力科学研究院 | A kind of three level DC translation circuit that neutral point voltage is controllable and its control method |
| CN109104128A (en) * | 2018-07-27 | 2018-12-28 | 西安许继电力电子技术有限公司 | A kind of control method and system of AC excitation system converter multiple module paralleling |
| CN110880892A (en) * | 2019-11-05 | 2020-03-13 | 武汉武水电气技术有限责任公司 | Control system of excitation adjusting device |
| CN111181175A (en) * | 2020-01-10 | 2020-05-19 | 广西大学 | Excitation system based on cooperative control theory and stabilization method thereof |
| CN111277002A (en) * | 2020-03-19 | 2020-06-12 | 国网浙江省电力有限公司电力科学研究院 | Flexible excitation power unit parallel topology structure and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112952784A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3292625B1 (en) | Wind turbine power generation system | |
| CN113629708B (en) | Control method for suppressing overvoltage of receiving-end converter under fault of receiving-end power grid of hybrid direct-current transmission system | |
| CN105119388A (en) | Current transformer energy-obtaining power supply working in wide current range | |
| CN113433483B (en) | On-line monitoring method and device for short-circuit current of alternating current system | |
| CN105552893B (en) | Control method of direct-current frequency limiter | |
| CN103560520A (en) | Unified power quality controller suitable for fault ride-through and control method | |
| CN102280901A (en) | Low-voltage ride-through control device and control method for compound type wind generator set | |
| CN114884112A (en) | Receiving end alternating current fault ride-through control method of hybrid cascade direct current transmission system | |
| CN107910877A (en) | Shunt capacitor switching control method during a kind of sending end current conversion station high power fluctuation | |
| CN112952784B (en) | Excitation variable overload limiter applicable to flexible excitation system | |
| US20220407316A1 (en) | Flexible excitation system and control method therefor | |
| CN204967289U (en) | Electric current mutual inductance of wide current range work is got can power | |
| CN203554355U (en) | A variable frequency air-conditioner and a motor control system based on a Z source converter | |
| CN116365901A (en) | Logistics sorting system and control method thereof | |
| CN103560679B (en) | PWM-type high power AC stable-pressure device | |
| CN201639482U (en) | High-voltage isolation multiple-output IGCT driving power supply | |
| CN107017654B (en) | Extra-high voltage direct current transmission control device for inhibiting alternating current temporary overvoltage | |
| CN111049410B (en) | Control method of electric energy conversion device and electric energy conversion system | |
| CN112888092A (en) | Low-frequency heating device of large-capacity power transformer | |
| CN111277000B (en) | Dynamic top voltage control method for flexible excitation system | |
| CN113746140B (en) | Doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission | |
| CN112117914B (en) | Reversible power supply device for thermal construction hoisting machinery | |
| CN213754007U (en) | Distributed energy storage grid-connected protection device | |
| Li et al. | A Reactive Power Coordination Control Scheme for Hybrid Multi-Infeed HVDC System | |
| CN113612222B (en) | Fault ride-through control method for hybrid direct current transmission system |
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 |