CN109274300A - The starting of Gas Turbine Generating Units and excitation system, method - Google Patents
The starting of Gas Turbine Generating Units and excitation system, method Download PDFInfo
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- CN109274300A CN109274300A CN201811337311.1A CN201811337311A CN109274300A CN 109274300 A CN109274300 A CN 109274300A CN 201811337311 A CN201811337311 A CN 201811337311A CN 109274300 A CN109274300 A CN 109274300A
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- excitation
- motor
- contactor
- starting
- generator
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
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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
- 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
-
- 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
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/25—Special adaptation of control arrangements for generators for combustion engines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a kind of starting of Gas Turbine Generating Units and excitation system, method, which includes；Direct-current switch power supply is connected to the excitation winding of dc motor by first contactor, for providing exciting current during startup of unit for dc motor；Starting control module is connected to the main winding of dc motor by second contactor, for providing starting current during startup of unit for dc motor；The output end of automatic exciter is connected to the excitation winding of dc motor by first contactor, for providing excitation after the completion of startup of unit for dc motor；The main winding of DC motor with separate excitation is connected by the normally opened main contact of third contactor and the excitation winding of generator, the input terminal of automatic exciter is also connected to by second contactor, DC motor with separate excitation is used to provide exciting current as exciter after the completion of startup of unit for generator, while providing power power-supply to automatic exciter.
Description
Technical field
The present invention relates to gas turbine fields, particularly, are related to starting and the excitation system of a kind of Gas Turbine Generating Units
System.Moreover, it relates to starting and the exciting method of a kind of Gas Turbine Generating Units.
Background technique
Existing small size gas turbine generating set, starting system and excitation system are all two independent systems, generally
The blowdown firing of unit, startup of unit are responsible for as motor, starting system is started using AC induction motor, excitation system is responsible for machine
Group starts after completion reaches rated speed and gives generator offer excitation.The installation space that this starting and excitation implementation need
Greatly, at high cost.
Summary of the invention
The present invention provides a kind of starting of Gas Turbine Generating Units and excitation systems, method, to solve existing starting
Big, the at high cost technical problem with excitation implementation installation space.
The technical solution adopted by the invention is as follows:
On the one hand, the present invention provides a kind of starting of Gas Turbine Generating Units and excitation systems, comprising: dc switch
Power supply, starting control module, automatic exciter, DC motor with separate excitation, generator, first contactor, second contactor and
Third contactor；Direct-current switch power supply is connected to the excitation winding of dc motor by first contactor, for rising in unit
Exciting current is provided during dynamic for dc motor；Starting control module is connected to dc motor by second contactor
Main winding, for providing starting current during startup of unit for dc motor；The output end of automatic exciter passes through
First contactor is connected to the excitation winding of dc motor, encourages for providing after the completion of startup of unit for dc motor
Magnetic；The main winding of DC motor with separate excitation is connected by the normally opened main contact of third contactor and the excitation winding of generator, also
The input terminal of automatic exciter is connected to by second contactor, DC motor with separate excitation after the completion of startup of unit for making
Exciting current is provided for generator for exciter, while providing power power-supply to automatic exciter.
Further, first contactor includes two normally opened main contacts and two normally closed main contacts, is cut as system excitation
Change control contactor；The output end of direct-current switch power supply is respectively connected to separate excitation by two normally opened main contacts of first contactor
The both ends of the excitation winding of dc motor；Two output ends of automatic exciter pass through two normally closed masters of first contactor
Contact is respectively connected to the both ends of the excitation winding of DC motor with separate excitation.
Further, it is also serially connected between the output end of direct-current switch power supply and the normally opened contact of first contactor and subtracts magnetoelectricity
Resistance, the resistance for subtracting magneto-resistor subtract equal to the voltage of direct-current switch power supply divided by the rated exciting current of DC motor with separate excitation
Remove the resistance of the excitation winding of DC motor with separate excitation.
Further, second contactor includes two normally opened main contacts and two normally closed main contacts, as system starting, is thrown
Excitation switching contactor；Starting control module is connected to DC motor with separate excitation by two normally opened main contacts of second contactor
Main winding；The input terminal of automatic exciter is connected to separate excitation direct current drive by two normally closed main contacts of second contactor
The main winding of machine.
Further, starting control module includes three phase full bridge rectification module, power of controlled silicon controller and direct current reactance
Device；Three phase full bridge rectification module is connect with electric main, for AC rectification to be converted to direct current；Power of controlled silicon control
Device is connected with three phase full bridge rectification module, for controlling starting time and the voltage rate of rise during startup of unit；Direct current
Reactor is connected with power of controlled silicon controller, and its other end is connected to two normally opened contacts of second contactor, for disappearing
Except starting control module output ripple and inhibit harmonic wave.
Further, third contactor includes one group of normally opened main contact and one group of normally closed main contact, as going out for generator
Magnetic switch；The excitation winding both ends of generator are connected to after the de-excitation resistance of the normally closed main contact series generator of third contactor
Degaussing switch as generator；Automatic exciter accesses voltage transformer, current transformer on generator output loop,
For measuring the output voltage and output electric current of generator.
According to another aspect of the present invention, starting and the exciting method of a kind of Gas Turbine Generating Units are additionally provided, is adopted
It is carried out with the starting of above-mentioned Gas Turbine Generating Units and excitation system, this method comprises:
During startup of unit, direct-current switch power supply provides exciting current, starting control mould for DC motor with separate excitation
Block provides starting current for DC motor with separate excitation；
After the completion of startup of unit, DC motor with separate excitation and generator realize coaxial rated speed by gas turbine drives
Operating, automatic exciter provides excitation for DC motor with separate excitation, and then the output direct current of DC motor with separate excitation is hair
Motor provides exciting current, while providing power power-supply to automatic exciter.
Further, during startup of unit,
After receiving starting command, first contactor and second contactor movement, third contactor prohibited act are controlled,
The control loop internal series-connection of third contactor has the normally closed auxiliary contact of first contactor, passes through series connection by direct-current switch power supply
Subtract magneto-resistor and provide exciting current for dc motor, electric main is provided for DC motor with separate excitation through starting control module and opened
Streaming current, so that DC motor with separate excitation starts.
Further, it after DC motor with separate excitation drives Gas Turbine Generating Units to complete to start, receives and disconnects
Dynamic order, gas turbine drives DC motor with separate excitation and generator realize coaxial rated speed operating at this time；
It receives after throwing excitation order, the conducting of control third contactor, first contactor and the banned stop of second contactor
Make, the normally closed auxiliary contact of third contactor is in series in the control loop of first contactor and second contactor, so that separate excitation
Dc motor switchs to exciter operating mode by electric motor mode, the voltage generated by the remnant field of DC motor with separate excitation
Automatic exciter is started, and exporting for automatic exciter (AVR) is encouraged to the excitation winding offer of DC motor with separate excitation
Magnetoelectricity stream, the output direct current of DC motor with separate excitation provides exciting current for generator, while providing to automatic exciter
Power power-supply.
Further, after startup of unit is completed to throw and be encouraged, automatic exciter passes through the electricity on generator output loop
Mutual inductor and current transformer are pressed to monitor voltage, the electric current of generator, power generation is automatically controlled by the voltage of measurement, electric current
The output voltage of machine, the active and reactive Generation Control to realize unit.
The invention has the following advantages:
The present invention is using DC motor with separate excitation as the starter of Gas Turbine Generating Units, after the completion of starting, separate excitation
Dc motor supplies power power-supply to automatic exciter AVR while providing excitation as exciter for generator, can
The installation space of similar unit is effectively reduced, it is simpler compared to traditional Excitation Method of Generators structure and route, it can reduce cost.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the attachment structure schematic diagram of the Gas Turbine Generating Units of the preferred embodiment of the present invention；
Fig. 2 is the principle of the starting of the Gas Turbine Generating Units of the preferred embodiment of the present invention and the major loop of excitation system
Figure；
Fig. 3 is the original of the starting of the Gas Turbine Generating Units of the preferred embodiment of the present invention and the secondary circuit of excitation system
Reason figure.
Drawing reference numeral explanation:
1, pedestal；2, gas turbine；3, retarder；100, starting control module；101, three phase full bridge rectification module；102,
Power of controlled silicon controller；103, direct current reactor；G, generator；XM, DC motor with separate excitation；R1, subtract magneto-resistor；R2, it goes out
Magneto-resistor；KM1, first contactor；KM2, second contactor；KM3, third contactor；PS1, direct-current switch power supply；PT, voltage
Mutual inductor；CT, current transformer.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Referring to Fig.1, Gas Turbine Generating Units of the invention are small size gas turbine generating set, and entirety includes setting
Gas turbine 2, retarder 3, generator G and DC motor with separate excitation XM on pedestal 1.In this preferred embodiment, generator G
Using motor is brushed hair, DC motor with separate excitation XM uses standard DC motor with separate excitation.Gas turbine 2 by retarder 3 with
The coaxial installation connection of generator G.DC motor with separate excitation XM installation coaxial with generator G, rated speed are identical.
Referring to Fig. 2 and Fig. 3, the starting and excitation system of the Gas Turbine Generating Units of the preferred embodiment of the present invention, benefit
Use standard DC motor with separate excitation as the starter of small size gas turbine generating set, after the completion of starting, separate excitation direct current drive
Machine-cut changes to dc generator operating mode, and the direct current which issues is while providing excitation to generator for certainly
Dynamic excitation unit AVR supplies power power-supply.The starting and excitation system of Gas Turbine Generating Units of the present invention are shown in Fig. 2
The schematic diagram of major loop, wherein each contactor is illustrated as main contact.The principle of secondary circuit corresponding with Fig. 2 is shown in Fig. 3
Figure, wherein each contactor is illustrated as auxiliary contact.
In this preferred embodiment, the starting of Gas Turbine Generating Units and excitation system include: direct-current switch power supply PS1,
Starting control module 100, automatic exciter AVR, DC motor with separate excitation XM, generator G, first contactor KM1, second connect
Tentaculum KM2 and third contactor KM3.Direct-current switch power supply PS1 is connected to DC motor with separate excitation XM by first contactor KM1
Excitation winding, for providing exciting current during startup of unit for DC motor with separate excitation XM.Starting control module 100
The main winding of DC motor with separate excitation XM is connected to by second contactor KM2, for straight for separate excitation during startup of unit
Galvanic electricity motivation XM provides starting current.The output end of automatic exciter AVR is connected to separate excitation direct current by first contactor KM1
The excitation winding of motor XM, for providing excitation after the completion of startup of unit for DC motor with separate excitation XM.Separate excitation direct current
The main winding of motivation XM is connect by the normally opened main contact of third contactor KM3 with the excitation winding of generator G, also passes through second
Contactor KM2 is connected to the input terminal of automatic exciter AVR, and DC motor with separate excitation XM after the completion of startup of unit for making
Exciting current is provided for generator G for exciter, while providing power power-supply to automatic exciter AVR.
The present invention is using DC motor with separate excitation XM as the starter of Gas Turbine Generating Units, after the completion of starting, he
It encourages while dc motor XM provides excitation as exciter for generator G and supplies power power-supply to automatic exciter AVR,
The installation space of similar unit can be effectively reduced, it is simpler compared to traditional Excitation Method of Generators structure and route, it can reduce into
This.
Further, first contactor KM1 includes two normally opened main contacts and two normally closed main contacts, as system excitation
Switching control contactor.The output end of direct-current switch power supply PS1 is connected respectively by two normally opened main contacts of first contactor KM1
It is connected to the both ends of the excitation winding of DC motor with separate excitation XM.Two output ends of automatic exciter AVR pass through the first contact
Two normally closed main contacts of device KM1 are respectively connected to the both ends of the excitation winding of DC motor with separate excitation XM.
Further, it is also concatenated between the output end of direct-current switch power supply PS1 and the normally opened main contact of first contactor KM1
Have and subtracts magneto-resistor R1.Subtract magneto-resistor R1 and start exciting current for realizing control DC motor with separate excitation XM, so that separate excitation direct current
The smooth starting of motor XM.In the present embodiment, voltage of the resistance equal to direct-current switch power supply PS1 for subtracting magneto-resistor R1 is removed
The resistance of the excitation winding of DC motor with separate excitation XM is subtracted with the rated exciting current of DC motor with separate excitation XM.
It is also parallel at the excitation winding both ends of DC motor with separate excitation XM by three sustained diodes 1, D2, D3 concatenation
At circuit, three diodes are used to absorb DC motor with separate excitation XM excitation winding when DC motor with separate excitation XM stops
Residual current, the form of three Diode series can effectively share the reversed excessive induced voltage of transient state, improve circuit
Reliability.
Further, second contactor KM2 includes two normally opened main contacts and two normally closed main contacts, is opened as system
Dynamic, throwing excitation switching contactor.Starting control module 100 is connected to him by two normally opened main contacts of second contactor KM2
Encourage the main winding of dc motor XM.The input terminal of automatic exciter AVR passes through two normally closed main touchings of second contactor KM2
Head is connected to the main winding of DC motor with separate excitation XM.
Further, starting control module 100 includes three phase full bridge rectification module 101,102 and of power of controlled silicon controller
Direct current reactor 103.Three phase full bridge rectification module 101 is connect with electric main, for AC rectification to be converted to direct current.
Power of controlled silicon controller 102 is connected with three phase full bridge rectification module 101, for controlling the starting time during startup of unit
With the voltage rate of rise.Direct current reactor 103 is connected with power of controlled silicon controller 102, and its other end is connected to second and connects
Two normally opened contacts of tentaculum KM2, for eliminating the output ripple of starting control module 100 and inhibiting harmonic wave.
In this preferred embodiment, third contactor KM3 includes one group of normally opened main contact and one group of normally closed main contact, as hair
The degaussing switch of motor G.The de-excitation resistance R2 connection generator G's of the normally closed main contact series generator G of third contactor KM3
Degaussing switch of the excitation winding both ends as generator G.The normally opened main contact of third contactor KM3 is used in starting process simultaneously
Middle disjunction DC motor with separate excitation XM and generator G can disconnect the connection between DC motor with separate excitation XM and generator G,
Guarantee effectively reliable start.Third contactor KM3 is acted after starting completion, and normally opened main contact closure conducting is the same as often
Main contact disconnection is closed, the excitation winding of the output supply generator G of DC motor with separate excitation XM can be realized to generator G's
Excitation.In compressor emergency shutdown, third contactor KM3 power loss, separated normally closed main contact is re-closed in operational process, generator
The excitation winding of G realizes generator G demagnetization by KM3 and de-excitation resistance R2 conducting.
Further, the excitation winding both ends of generator G are parallel with the normally closed master of de-excitation resistance R2 Yu third contactor KM3
The series circuit of contact.De-excitation resistance R2 can absorb rapidly the excitation winding of generator G when generator G cuts off energized circuit
Magnetic energy slows down generator G rotor current pace of change, rotor self induction electromotive force is reduced, to inhibit overvoltage and demagnetization.
Automatic exciter AVR has accessed the voltage transformer pt and/or Current Transmit on generator G output loop.Such knot
Structure can realize automatic exciter AVR and monitor by voltage transformer pt and Current Transmit voltage, the electricity of generator G
Stream, and then output electric current is automatically controlled by the voltage of measurement, electric current, to control the output of exciter XM, and then realize
Output voltage, active and reactive control to generator G.
The starting of Gas Turbine Generating Units of the invention and excitation system further include control panel and instrument, for for behaviour
Make personnel and control parameter and input order etc. are set.Control system is additionally included, for issuing starting command, throwing excitation life
It enables, and each contactor movement of control.
The present invention also provides a kind of starting of Gas Turbine Generating Units and exciting methods, using above-mentioned gas turbine
The starting of generating set and excitation system carry out, this method comprises:
During startup of unit, direct-current switch power supply PS1 provides exciting current for DC motor with separate excitation XM, starts control
Molding block 100 provides starting current for DC motor with separate excitation XM；
After the completion of startup of unit, DC motor with separate excitation XM and generator G are driven in fact by gas turbine by retarder
Now coaxial rated speed operating, automatic exciter AVR provide excitation, and then separate excitation direct current drive for DC motor with separate excitation XM
The output direct current of machine XM provides exciting current for generator G, while providing power power-supply to automatic exciter AVR, at this time
DC motor with separate excitation XM is changed into exciter by motor and provides excitation for generator G.
Further, during startup of unit,
After receiving starting command, first contactor KM1 and second contactor KM2 movement, third contactor KM3 quilt are controlled
The control loop internal series-connection of prohibited acts, third contactor KM3 has the normally closed auxiliary contact of first contactor KM1, by direct current
Switching Power Supply PS1 subtracts magneto-resistor R1 by series connection and provides exciting current for DC motor with separate excitation XM, and electric main is controlled through starting
Molding block 100 provides starting current for DC motor with separate excitation XM, so that DC motor with separate excitation XM is started；
After DC motor with separate excitation XM drives Gas Turbine Generating Units to complete to start, disconnection starting command is received,
Gas turbine drives DC motor with separate excitation XM and generator G realizes coaxial rated speed operating at this time.
It receives after throwing excitation order, control third contactor KM3 conducting, first contactor KM1 and second contactor KM2
The normally closed of third contactor KM3 is in series in the control loop of prohibited act, first contactor KM1 and second contactor KM2
Auxiliary contact, so that DC motor with separate excitation XM switchs to exciter operating mode by electric motor mode, by DC motor with separate excitation
The voltage start automatic exciter AVR that the remnant field of XM generates, and exporting for automatic exciter AVR gives separate excitation direct current
The excitation winding of motor XM provides exciting current, and the output direct current of DC motor with separate excitation XM provides for the generator G
Exciting current, while power power-supply is provided to the automatic exciter AVR.
After startup of unit is completed to throw and be encouraged, automatic exciter AVR passes through the voltage on generator G output loop simultaneously
Mutual inductor PT and Current Transmit monitor voltage, the electric current of generator G, are automatically controlled by the voltage of measurement, electric current
The output voltage of generator G, the active and reactive Generation Control to realize unit.
A specific implementation process of starting and exciting method of the invention is given below.
In starting process, Gas Turbine Generating Units of the invention are started and excitation system receives that control system issues
Dynamic order, KM1, KM2 are acted at this time, KM3 prohibited act, so that two normally opened main contact closures, the two normally closed main touchings of KM1
Head disconnects, and the normally opened main contact closure of two of KM2, two normally closed main contacts disconnect.Under this state, by direct-current switch power supply PS1
Concatenation subtracts magneto-resistor R2 and provides excitation to DC motor with separate excitation XM through KM1, and external 380VAC alternating current passes through three phase full bridge
Rectification module 101, power of controlled silicon controller 102 and direct current reactor 103, which are exported, gives DC motor with separate excitation XM through KM2,
The time of starting is set in power of controlled silicon controller 102, the slope that voltage rises rises to control DC motor with separate excitation XM
It is dynamic.After DC motor with separate excitation XM is started, because of its connection coaxial with generator G, and generator G passes through deceleration with gas turbine
The coaxial installation of device, thus will drive gas turbine and start and rotate.Control system disconnects starting command after the completion of starting, and unit is logical
It crosses Gas Turbine Output and reaches rated speed, start motor XM and generator G at this time and driven by gas turbine by retarder
Realize coaxial rated speed operating.
The system receives the throwing excitation order that control system issues, KM3 movement, the banned stop of KM1, KM2 during excitation
Make, so that the normally opened main contact of KM3 is connected normally closed main contact and disconnects, the normally opened main contact disconnection of two of KM1, two normally closed main touchings
Head closure, the normally opened main contact of two of KM2 disconnects, two normally closed main contact closures.DC motor with separate excitation XM switchs to encourage at this time
Magnetomechanical operating mode, the voltage generated by the remnant field of DC motor with separate excitation XM are encouraged automatically through the normally-closed contact starting of KM2
Magnetic device AVR.Normally-closed contact of the automatic exciter AVR through KM1 provides excitation, separate excitation direct current to DC motor with separate excitation XM
Motivation XM output voltage steps up, and DC motor with separate excitation XM output electricity is while providing excitation to generator G to automatic
Excitation unit AVR provides power power-supply (can be regarded as the self excitation system using exciter output), the output voltage of exciter
It is not high just within the tolerance range of AVR, thus eliminate the exciting transformer in conventional brush-less generator excited system.
Automatic exciter AVR monitors voltage, the electric current of generator G by voltage transformer pt, Current Transmit simultaneously, passes through
Voltage, the electric current of measurement come the output voltage of automatic generator, the active and reactive Generation Control to realize unit.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the starting and excitation system of a kind of Gas Turbine Generating Units characterized by comprising direct-current switch power supply (PS1),
Starting control module (100), automatic exciter (AVR), DC motor with separate excitation (XM), generator (G), first contactor
(KM1), second contactor (KM2) and third contactor (KM3)；
The direct-current switch power supply (PS1) is connected to the excitation winding of dc motor (XM) by first contactor (KM1), uses
During startup of unit be dc motor (XM) provide exciting current；
The starting control module (100) is connected to the main winding of dc motor (XM) by second contactor (KM2), is used for
Starting current is provided during startup of unit for dc motor (XM)；
The output end of the automatic exciter (AVR) is connected to dc motor (XM) by the first contactor (KM1)
Excitation winding, for after the completion of startup of unit for dc motor (XM) provide excitation；
The normally opened main contact and generator (G) that the main winding of the DC motor with separate excitation (XM) passes through third contactor (KM3)
Excitation winding connection, the input terminal of the automatic exciter (AVR) is also connected to by the second contactor (KM2),
The DC motor with separate excitation (XM) is used to after the completion of startup of unit be that the generator (G) provides excitation electricity as exciter
Stream, while power power-supply is provided to the automatic exciter (AVR).
2. the starting and excitation system of Gas Turbine Generating Units according to claim 1, which is characterized in that
The first contactor (KM1) includes two normally opened main contacts and two normally closed main contacts, switches as system excitation and controls
Contactor processed；
The output end of the direct-current switch power supply (PS1) is separately connected by two normally opened main contacts of first contactor (KM1)
To the both ends of the excitation winding of the DC motor with separate excitation (XM)；
Two normally closed main contact difference that two output ends of the automatic exciter (AVR) pass through first contactor (KM1)
It is connected to the both ends of the excitation winding of the DC motor with separate excitation (XM).
3. the starting and excitation system of Gas Turbine Generating Units according to claim 2, which is characterized in that
It is also serially connected between the output end of the direct-current switch power supply (PS1) and the normally opened contact of first contactor (KM1) and subtracts magnetic
Resistance (R1) subtracts voltage of the resistance equal to direct-current switch power supply (PS1) of magneto-resistor (R1) divided by DC motor with separate excitation
(XM) rated exciting current subtracts the resistance of the excitation winding of DC motor with separate excitation (XM).
4. the starting and excitation system of Gas Turbine Generating Units according to claim 1, which is characterized in that
The second contactor (KM2) includes two normally opened main contacts and two normally closed main contacts, as system starting, throws excitation
Switching contactor；
The starting control module (100) by two normally opened main contacts of the second contactor (KM2) be connected to it is described he
Encourage the main winding of dc motor (XM)；
The input terminal of the automatic exciter (AVR) is connected by two normally closed main contacts of the second contactor (KM2)
To the main winding of the DC motor with separate excitation (XM).
5. the starting and excitation system of Gas Turbine Generating Units according to claim 4, which is characterized in that
The starting control module (100) includes three phase full bridge rectification module (101), power of controlled silicon controller (102) and straight
It flows reactor (103)；
The three phase full bridge rectification module (101) connect with electric main, for AC rectification to be converted to direct current；
The power of controlled silicon controller (102) is connected with the three phase full bridge rectification module (101), in startup of unit mistake
Starting time and the voltage rate of rise are controlled in journey；
The direct current reactor (103) is connected with the power of controlled silicon controller (102), and its other end is connected to described
Two normally opened contacts of two contactors (KM2), for eliminating the output ripple of starting control module (100) and inhibiting harmonic wave.
6. the starting and excitation system of Gas Turbine Generating Units according to claim 1, which is characterized in that
The third contactor (KM3) includes one group of normally opened main contact and one group of normally closed main contact, the demagnetization as generator (G)
Switch；
Generator is connected to after the de-excitation resistance (R2) of the normally closed main contact series generator (G) of the third contactor (KM3)
(G) degaussing switch of the excitation winding both ends as generator (G)；
Voltage transformer (PT), current transformer on described automatic exciter (AVR) access generator (G) output loop
(CT), for measuring the output voltage and output electric current of generator.
7. starting and the exciting method of a kind of Gas Turbine Generating Units, which is characterized in that using any in such as claim 1-6
The starting of Gas Turbine Generating Units described in and excitation system carry out, this method comprises:
During startup of unit, direct-current switch power supply (PS1) is that DC motor with separate excitation (XM) provides exciting current, starts control
Molding block (100) is that DC motor with separate excitation (XM) provides starting current；
After the completion of startup of unit, DC motor with separate excitation (XM) and generator (G) are coaxial specified by gas turbine drives realization
Rotation speed operation, automatic exciter (AVR) are that DC motor with separate excitation (XM) provides excitation, and then DC motor with separate excitation (XM)
Output direct current be the generator (G) provide exciting current, while to the automatic exciter (AVR) provide power electricity
Source.
8. starting and the exciting method of Gas Turbine Generating Units according to claim 7, which is characterized in that
During startup of unit,
After receiving starting command, first contactor (KM1) and second contactor (KM2) movement, third contactor (KM3) are controlled
The control loop internal series-connection of prohibited act, third contactor (KM3) has the normally closed auxiliary contact of first contactor (KM1),
Subtracting magneto-resistor (R1) by series connection by direct-current switch power supply (PS1) is that dc motor (XM) provides exciting current, electric main
It is that DC motor with separate excitation (XM) provides starting current through starting control module (100), so that DC motor with separate excitation (XM) rises
It is dynamic.
9. starting and the exciting method of Gas Turbine Generating Units according to claim 8, which is characterized in that
After DC motor with separate excitation (XM) drives Gas Turbine Generating Units to complete to start, disconnection starting command is received, this
When gas turbine drives DC motor with separate excitation (XM) and generator (G) realize the operating of coaxial rated speed；
It receives after throwing excitation order, control third contactor (KM3) conducting, first contactor (KM1) and second contactor
(KM2) third contactor is in series in the control loop of prohibited act, first contactor (KM1) and second contactor (KM2)
(KM3) normally closed auxiliary contact, so that DC motor with separate excitation (XM) switchs to exciter operating mode by electric motor mode, by him
Encourage the voltage start automatic exciter (AVR) that the remnant field of dc motor (XM) generates, and automatic exciter
(AVR) export to DC motor with separate excitation (XM) excitation winding provide exciting current, DC motor with separate excitation (XM) it is defeated
Direct current is that the generator (G) provides exciting current, while providing power power-supply to the automatic exciter (AVR) out.
10. starting and the exciting method of Gas Turbine Generating Units according to claim 9, which is characterized in that
After startup of unit is completed to throw and be encouraged,
Automatic exciter (AVR) passes through the voltage transformer (PT) and current transformer (CT) on generator (G) output loop
Monitor voltage, the electric current of generator (G), by the voltage of measurement, electric current come the output voltage of automatic generator (G),
The active and reactive Generation Control to realize unit.
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