CN104038124B - Exciter control system based on double Exciting Windings for Transverse Differential Protection - Google Patents
Exciter control system based on double Exciting Windings for Transverse Differential Protection Download PDFInfo
- Publication number
- CN104038124B CN104038124B CN201410250815.5A CN201410250815A CN104038124B CN 104038124 B CN104038124 B CN 104038124B CN 201410250815 A CN201410250815 A CN 201410250815A CN 104038124 B CN104038124 B CN 104038124B
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- CN
- China
- Prior art keywords
- differential protection
- transverse differential
- exciting windings
- excitation
- generator
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- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
Abstract
The invention discloses a kind of excitation system based on double Exciting Windings for Transverse Differential Protection, belong to generator excitation control field.Comprising main Exciting Windings for Transverse Differential Protection and secondary Exciting Windings for Transverse Differential Protection, two Exciting Windings for Transverse Differential Protection magnetic fields are coupled by rotor core.Main Exciting Windings for Transverse Differential Protection is used to provide generator the non-strong rotating excitation field encouraged under operating mode, and secondary Exciting Windings for Transverse Differential Protection is used to provide realization the strong rotating excitation field encouraged under generator encourages by force operating mode.The present invention improves the power factor of excitation system load, reduce the harmonic current of field power supply, reduce the loss of exciting transformer, reduce IGCT commutation peak overvoltage, so that existing field circuit breaker can be applied to Generator Set, particularly Half Speed nuclear power improves the reliability and security of exciter control system, while also ensure that the reliability service of generating set from the excitation system of shunt excitation unit.
Description
Technical field
The invention belongs to generator excitation control field, more particularly to a kind of excitation con-trol system based on double Exciting Windings for Transverse Differential Protection
System.
Background technology
As China's power construction is advanced by leaps and bounds, improved rapidly in the single-machine capacity for building generator unit, while nuclear energy, water
The regenerative resources such as energy, wind energy, solar energy and biomass energy are also being developed rapidly.Water power, thermoelectricity in Large Copacity, nuclear power generating sets
In, due to larger rated excitation power supply and rated exciting current, to the exciting transformer in generator excited system, magnetic
The service behaviour such as field circuit breaker, power cabinet index and reliability requirement propose higher and higher requirement.
The inside transformer of generator or generator-transformer group, and generator end is to generator or generating
During the accident that is short-circuited between machine-transformer group breaker, relay protection will be acted and tripped, but generator or generator-change
Short dot does not cut off after depressor group circuit breaker trip, and the induced potential that generator rotor field electric current is produced continues to failure electricity
Stream.Short circuit continue, insulation can be caused to burn out, conductor fusing or scaling loss iron core, within the very short duration, be often likely to
Cause generator, transformer it is badly damaged, and there is a possibility that accident expands rapidly.Avoid or reduce device damage and limitation thing
Therefore the measure for expanding is to carry out quick de-excitation to generator, is reduced to the exciting current of generator within the time as short as possible
Zero.It is widely used at present be move can type demagnetization, i.e., by the effect of field circuit breaker disjunction arc voltage (to ac de-excitation mode still
Play the role of alternating voltage), rotor current is transferred to by the loop constituted with field circuit breaker and returning that de-excitation resistance is constituted
Road.After electric current is shifted completely, field circuit breaker breaking current ceases arc disjunction for zero, cuts off rotor-exciting power supply, generator
Rotor constitutes closed-loop path with de-excitation resistance.To realize that rotor current shifts completion demagnetization disjunction completely to de-excitation resistance loop,
The demagnetization disjunction arc voltage of field circuit breaker, it is defeated that the ceiling voltage and demagnetization that should be not less than de-excitation resistance start exciting power rectifier
Go out voltage sum.
Due to the peace of thyristor device under the conditions of the requirement of the initial voltage response speed high to excitation system and Large Copacity
It is complete to require, have become main flow excitation mode from shunt excitation mode.For mega kilowatt nuclear power generators self-shunt excitation system,
Because the more conventional 1000MW fire coal Turbo-generator Sets of its rated exciting current or 700MW turbine-generator units will be twice a left side
The right side, therefore propose requirement higher to eliminating magnetism of generator particularly field circuit breaker breaking capacity.And use the open circuit of existing magnetic field
Device and Traditional DC demagnetization scheme its breaking capacity are difficult to meet Generator Set safely and fast the need for demagnetization.
In the design process of excitation system, it usually needs consider to ensure that unit has and enough strong encourage ability, it is considered to be strong
The excitation system of multiple is encouraged, voltage x current requirement higher is required when parts selection is designed.Particularly with Large Copacity
Generating set, excitation system needs the exciting transformer and power conversion unit of Large Copacity, although its technology does not exist bottleneck,
The increase of capacity brings the problem of reliability reduction.
For large sized unit to the requirements at the higher level of excitation system reliability and safety, merely by field circuit breaker,
The lifting of exciting transformer performance be obviously difficult meet require, in the urgent need to ensure Large Copacity under ensure excitation system safety, can
By, the method for effectively realizing its function.
The content of the invention
It is difficult to meet high-rating generator to solve existing field circuit breaker and Traditional DC demagnetization scheme its breaking capacity
Group safely and fast the need for demagnetization and in Generator Set the reduction of capital equipment reliability problem, the present invention provides a kind of base
In the exciter control system of double Exciting Windings for Transverse Differential Protection.
A kind of exciter control system based on double Exciting Windings for Transverse Differential Protection, comprising main Exciting Windings for Transverse Differential Protection and secondary Exciting Windings for Transverse Differential Protection, main excitation around
The magnetic field of group and secondary Exciting Windings for Transverse Differential Protection is coupled by iron core, and main Exciting Windings for Transverse Differential Protection magnetic field is encouraged under operating mode by force for providing generator non-
Excitation field, secondary Exciting Windings for Transverse Differential Protection be used for generator it is strong encourage operating mode under put into, secondary Exciting Windings for Transverse Differential Protection excitation field and main excitation around
Group excitation field superposition.
Also include voltage regulator, voltage regulator is defeated with the power conversion part of secondary Exciting Windings for Transverse Differential Protection to main Exciting Windings for Transverse Differential Protection
Go out power to be respectively controlled.
The secondary Exciting Windings for Transverse Differential Protection includes closure switch, and closure switch are in parallel with secondary Exciting Windings for Transverse Differential Protection.
The secondary Exciting Windings for Transverse Differential Protection is separately provided field power supply or is shared with the main Exciting Windings for Transverse Differential Protection.
Gating switch or disconnecting link are installed between the field power supply and secondary Exciting Windings for Transverse Differential Protection of the secondary Exciting Windings for Transverse Differential Protection.
Relative to the exciter control system of only one of which Exciting Windings for Transverse Differential Protection, two Exciting Windings for Transverse Differential Protection loops reduce to encouraging the present invention
The requirement of the capacity and field circuit breaker disjunction voltage of magnetic transformer, improves the power factor of excitation system load, reduces
The harmonic current of field power supply, reduces the loss of exciting transformer, reduces IGCT commutation peak overvoltage so that existing
Field circuit breaker can be applied to the excitation system of Generator Set, particularly Half Speed nuclear power from shunt excitation unit, improve excitation
The reliability and security of control system, while also ensure that the reliability service of generating set.
Brief description of the drawings
Fig. 1 is the schematic diagram in the present invention；
Fig. 2 is the schematic diagram of embodiment two in the present invention.
Specific embodiment
As shown in figure 1, the exciter control system based on double Exciting Windings for Transverse Differential Protection includes main Exciting Windings for Transverse Differential Protection L1 and secondary Exciting Windings for Transverse Differential Protection L2,
Main Exciting Windings for Transverse Differential Protection L1 couples superposition with the magnetic field of secondary Exciting Windings for Transverse Differential Protection L2 by iron core, and main Exciting Windings for Transverse Differential Protection L1 offers are non-to encourage under operating mode by force
Generator excitation magnetic field, secondary Exciting Windings for Transverse Differential Protection L2 comes into operation in the case where generating set encourages by force operating mode, with main Exciting Windings for Transverse Differential Protection L1 magnetic fields
Superposition, common offer encourages generator excitation magnetic field under operating mode by force.
Main Exciting Windings for Transverse Differential Protection L1 and pair Exciting Windings for Transverse Differential Protection L2 have each independent energized circuit.Field power supply Ef1 is through excitation transformation
Device 1, power conversion part 1 provide exciting current to main Exciting Windings for Transverse Differential Protection L1, and field circuit breaker 1, demagnetization and mistake are installed in DC side
Pressure protective loop 1 is in parallel with main Exciting Windings for Transverse Differential Protection L1；Field power supply Ef2 is through exciting transformer 2, power conversion part 2 to secondary excitation
Winding L2 provides exciting current, and field circuit breaker 2, demagnetization and overvoltage protection loop 2 and secondary Exciting Windings for Transverse Differential Protection L2 are installed in DC side
Parallel connection, for ensure pair Exciting Windings for Transverse Differential Protection L2 in the case where not coming into operation be in closure state, by closure switch with pair excitation around
Group L2 is in parallel；Voltage regulator AVR unites to power conversion part 1 and power conversion part 2 according to operation state of generator
One control.Exciting transformer 1 can be in parallel in primary side with exciting transformer 2.The side installing gating switch of exciting transformer 2
Or disconnecting link.Secondary Exciting Windings for Transverse Differential Protection L2 need to access closed-loop path when not coming into operation, and be realized by closure switch, the feelings for coming into operation
Closure switch are disconnected under condition, winding induced overvoltage so can be both prevented, it is also possible to increases the damping of unit.
As shown in Fig. 2 be embodiments of the invention two, embodiment two compared with the technology of embodiment one, secondary Exciting Windings for Transverse Differential Protection L2
Field power supply is different, and pair Exciting Windings for Transverse Differential Protection L2 field power supplies Ef2 is separately provided in the present embodiment, is connected to other station-service electrical circuits or takes
From station service, the strong defect for encouraging scarce capacity when can avoid short-circuit of machine's port using station service.
In the case of normal work, there is electric current to flow through on only main Exciting Windings for Transverse Differential Protection L1, for needed for generator provides generating
Rotating excitation field, secondary Exciting Windings for Transverse Differential Protection L2 forms closed-loop path by closure switch；When generator needs strong encouraging, closure gating is opened
Close, simultaneously switch off the closed-loop path of secondary Exciting Windings for Transverse Differential Protection L2, the secondary Exciting Windings for Transverse Differential Protection L2 of input；The magnetic field of two windings is coupled altogether by iron core
With the rotating excitation field needed for providing generator.Main Exciting Windings for Transverse Differential Protection L1 and pair Exciting Windings for Transverse Differential Protection L2 have each independent demagnetization and overvoltage guarantor
Shield loop, puts into the case where each demagnetization and overvoltage protection is needed.
Main Exciting Windings for Transverse Differential Protection L1 be operated in it is non-encourage operating mode by force, its capacity of exciting transformer 1, the disjunction voltage of field circuit breaker 1 etc.
Parameter can be designed type selecting by the parameter under generator declared working condition；It is not long-term continuous duty due to encouraging operating mode by force, it is secondary
Exciting Windings for Transverse Differential Protection L2 just comes into operation when needing unit to encourage by force, its capacity of exciting transformer 2, the disjunction of field circuit breaker 2 electricity
The short time duty that the parameters such as pressure can by force be encouraged requirement by generator is designed type selecting.The de-excitation resistance capacity root of two Exciting Windings for Transverse Differential Protection
Energy storage when being worked according to respective winding determines.The overvoltage protection circuit behavior value of two Exciting Windings for Transverse Differential Protection also will by the overvoltage of respective winding
Ask and be designed.
Relative to the exciter control system of only one of which Exciting Windings for Transverse Differential Protection, the exciting transformer in double Exciting Windings for Transverse Differential Protection systems is secondary
Side voltage can reduce nearly half, each winding bear maximum voltage is also dropped by nearly half, particularly consider commutation spike mistake
Voltage, winding insulation bears overvoltage level or even to be reduced to less than half, can greatly provide the insulation safety water of system
It is flat；Two Exciting Windings for Transverse Differential Protection loops reduce the requirement to the capacity and field circuit breaker disjunction voltage of exciting transformer simultaneously, carry
The power factor of excitation load high, reduces the harmonic current of field power supply, reduces the loss of exciting transformer, reduces
IGCT commutation peak overvoltage so that existing field circuit breaker can be applied to Generator Set, particularly Half Speed nuclear power
From the excitation system of shunt excitation unit, the reliability and security of exciter control system are improved, while also ensure that generating set
Reliability service.
Claims (5)
1. a kind of exciter control system based on double Exciting Windings for Transverse Differential Protection, it is characterised in that comprising main Exciting Windings for Transverse Differential Protection and secondary Exciting Windings for Transverse Differential Protection,
The magnetic field of main Exciting Windings for Transverse Differential Protection and secondary Exciting Windings for Transverse Differential Protection is coupled by iron core, and main Exciting Windings for Transverse Differential Protection magnetic field is encouraged by force for providing generator non-
Excitation field under operating mode, secondary Exciting Windings for Transverse Differential Protection be used for generator it is strong encourage operating mode under put into, secondary Exciting Windings for Transverse Differential Protection excitation field with
Main Exciting Windings for Transverse Differential Protection excitation field superposition.
2. the exciter control system based on double Exciting Windings for Transverse Differential Protection according to right wants ball 1, it is characterised in that also adjusted including voltage
Section device, voltage regulator is respectively controlled to the power output of main Exciting Windings for Transverse Differential Protection and the power conversion part of secondary Exciting Windings for Transverse Differential Protection.
3. the exciter control system based on double Exciting Windings for Transverse Differential Protection according to right wants ball 1, it is characterised in that the secondary excitation around
Group includes closure switch, and closure switch are in parallel with secondary Exciting Windings for Transverse Differential Protection.
4. the exciter control system based on double Exciting Windings for Transverse Differential Protection according to right wants ball 1, it is characterised in that the secondary excitation around
Group is separately provided field power supply or is shared with the main Exciting Windings for Transverse Differential Protection.
5. the exciter control system based on double Exciting Windings for Transverse Differential Protection according to right wants ball 4, it is characterised in that in the secondary excitation
Gating switch or disconnecting link are installed between the field power supply of winding and secondary Exciting Windings for Transverse Differential Protection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250815.5A CN104038124B (en) | 2014-06-06 | 2014-06-06 | Exciter control system based on double Exciting Windings for Transverse Differential Protection |
| PCT/CN2014/086196 WO2015184697A1 (en) | 2014-06-06 | 2014-09-10 | Excitation system based on double excitation windings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410250815.5A CN104038124B (en) | 2014-06-06 | 2014-06-06 | Exciter control system based on double Exciting Windings for Transverse Differential Protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104038124A CN104038124A (en) | 2014-09-10 |
| CN104038124B true CN104038124B (en) | 2017-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410250815.5A Active CN104038124B (en) | 2014-06-06 | 2014-06-06 | Exciter control system based on double Exciting Windings for Transverse Differential Protection |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104038124B (en) |
| WO (1) | WO2015184697A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362919A (en) * | 2014-11-27 | 2015-02-18 | 南车资阳机车有限公司 | Excitation device for synchronizing main generator and auxiliary generator and control method of excitation device |
| CN104821757B (en) * | 2015-04-10 | 2017-02-08 | 国电南瑞科技股份有限公司 | Synchronous motor excitation system control method based on real-time state internal potential control |
| CN105141206A (en) * | 2015-08-14 | 2015-12-09 | 柳州佳力电机股份有限公司 | Self-excited excitation system for large and medium-sized high-voltage generators |
| CN105099308B (en) * | 2015-09-22 | 2018-06-29 | 东方电机控制设备有限公司 | A kind of generator excitation unit |
| CN114094897A (en) * | 2020-07-31 | 2022-02-25 | 华为技术有限公司 | Radio excitation system, detection method and electric automobile |
| CN114172420B (en) * | 2021-11-26 | 2023-06-23 | 苏州热工研究院有限公司 | Complete set and protection control system of rotor coupling double-machine parallel motor generator set |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102365A (en) * | 1985-04-01 | 1986-07-02 | 华中工学院 | The excitation unit of multi-slip-ring type synchronous generator |
| JPH08275569A (en) * | 1995-03-31 | 1996-10-18 | Hitachi Koki Co Ltd | Power tool |
| CN2309013Y (en) * | 1997-09-03 | 1999-02-24 | 曾一峰 | Brushless excitation device of synchro generator |
| CN1941607A (en) * | 2006-09-05 | 2007-04-04 | 四川东风电机厂有限公司 | Brushless excitor system of TRT synchronous generator |
| CN201211689Y (en) * | 2005-07-11 | 2009-03-25 | 布莱克和戴克公司 | Soft startup of electric tool motor |
| CN201274445Y (en) * | 2008-08-13 | 2009-07-15 | 泰豪科技股份有限公司 | Double pole type brushless double-flow generator |
| DE102010060998A1 (en) * | 2010-12-03 | 2012-06-06 | Universität Kassel | Brushless synchronous generator has rotor with auxiliary excitation winding having full pole geometry that is driven with main excitation winding on common armature and is connected with rectifier bridge arranged at rotor |
| CN102522868A (en) * | 2011-12-12 | 2012-06-27 | 南京航空航天大学 | Double excitation-winding compound-excitation double-salient brushless direct-current generator |
| CN103490685A (en) * | 2012-06-11 | 2014-01-01 | 杨泰和 | Switch type dc electric machine having auxiliary excitation winding and conduction ring and brush |
| CN103580417A (en) * | 2012-07-30 | 2014-02-12 | 英泰集团有限公司 | Range-extending electric generator for range-extending type electric automobile |
| CN103684160A (en) * | 2013-12-05 | 2014-03-26 | 南京航空航天大学 | Self-boosting doubly-salient brushless direct-current power generation system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5239254A (en) * | 1992-03-26 | 1993-08-24 | Shindaiwa Kogyo Company Ltd. | Series-exciting device for synchronous generators |
| US5325035A (en) * | 1993-02-12 | 1994-06-28 | Yong Ho Chiu | Control device for intermittent operation of an induction motor |
| US5757154A (en) * | 1993-07-09 | 1998-05-26 | Ryobi Motor Products Corp. | Electric motor braking circuit arrangement |
| CN202586860U (en) * | 2012-05-24 | 2012-12-05 | 湖北同发机电有限公司 | Compound excitation device with secondary winding |
-
2014
- 2014-06-06 CN CN201410250815.5A patent/CN104038124B/en active Active
- 2014-09-10 WO PCT/CN2014/086196 patent/WO2015184697A1/en active Application Filing
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102365A (en) * | 1985-04-01 | 1986-07-02 | 华中工学院 | The excitation unit of multi-slip-ring type synchronous generator |
| JPH08275569A (en) * | 1995-03-31 | 1996-10-18 | Hitachi Koki Co Ltd | Power tool |
| CN2309013Y (en) * | 1997-09-03 | 1999-02-24 | 曾一峰 | Brushless excitation device of synchro generator |
| CN201211689Y (en) * | 2005-07-11 | 2009-03-25 | 布莱克和戴克公司 | Soft startup of electric tool motor |
| CN1941607A (en) * | 2006-09-05 | 2007-04-04 | 四川东风电机厂有限公司 | Brushless excitor system of TRT synchronous generator |
| CN201274445Y (en) * | 2008-08-13 | 2009-07-15 | 泰豪科技股份有限公司 | Double pole type brushless double-flow generator |
| DE102010060998A1 (en) * | 2010-12-03 | 2012-06-06 | Universität Kassel | Brushless synchronous generator has rotor with auxiliary excitation winding having full pole geometry that is driven with main excitation winding on common armature and is connected with rectifier bridge arranged at rotor |
| CN102522868A (en) * | 2011-12-12 | 2012-06-27 | 南京航空航天大学 | Double excitation-winding compound-excitation double-salient brushless direct-current generator |
| CN103490685A (en) * | 2012-06-11 | 2014-01-01 | 杨泰和 | Switch type dc electric machine having auxiliary excitation winding and conduction ring and brush |
| CN103580417A (en) * | 2012-07-30 | 2014-02-12 | 英泰集团有限公司 | Range-extending electric generator for range-extending type electric automobile |
| CN103684160A (en) * | 2013-12-05 | 2014-03-26 | 南京航空航天大学 | Self-boosting doubly-salient brushless direct-current power generation system |
Non-Patent Citations (1)
| Title |
|---|
| 中小型同步发电机组励磁系统改造;徐咏梅等;《电力自动化设备》;20080229;第28卷(第2期);第119-121页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104038124A (en) | 2014-09-10 |
| WO2015184697A1 (en) | 2015-12-10 |
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