CN107026590A - A kind of switching magnetic-resistance current transformer of wind-driven generator and its control method - Google Patents
A kind of switching magnetic-resistance current transformer of wind-driven generator and its control method Download PDFInfo
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- CN107026590A CN107026590A CN201710273136.3A CN201710273136A CN107026590A CN 107026590 A CN107026590 A CN 107026590A CN 201710273136 A CN201710273136 A CN 201710273136A CN 107026590 A CN107026590 A CN 107026590A
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- 230000005284 excitation Effects 0.000 claims abstract description 148
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- 238000004804 winding Methods 0.000 claims description 86
- 230000005611 electricity Effects 0.000 claims description 19
- 230000033228 biological regulation Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
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- 239000000696 magnetic material Substances 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
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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
- 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
- H02P9/36—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using armature-reaction-excited machines
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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
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
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- Control Of Eletrric Generators (AREA)
Abstract
A kind of switching magnetic-resistance current transformer of wind-driven generator, by unsteady flow main circuit, export bus capacitor, isolated DC/DC converters, excitation and electric discharge main circuit composition, unsteady flow main circuit output connection output bus capacitor, simultaneously as the input of isolated DC/DC converters, isolated DC/DC converters output connection excitation and electric discharge main circuit input, excitation is connected the input of unsteady flow main circuit with electric discharge main circuit output, unsteady flow main circuit output cathode end also connects excitation and the electric discharge input of electric discharge main circuit, excitation and electric discharge main circuit output cathode end, unsteady flow main circuit output negative pole end, unsteady flow main circuit inputs positive terminal short circuit；By three class control model under different condition under the structure, realize that wide generation range, high generating capacity, multi-angle are flexibly controlled, it is adaptable to all kinds of wind power generation fields.
Description
Technical field
The present invention relates to wind power generation field, and in particular to a kind of converter circuit topology of switching magnetic-resistance wind-driven generator
System and its control method.
Background technology
Generated electricity using switch reluctance generator, be a kind of new generation mode；Switch reluctance generator is used to adapt to
Electricity generation system under wind characteristic, there is no the real case commercially used both at home and abroad at present, and reason is switch reluctance generator
Exclusive structure and converter system is more special, is in recent years among research.
Wind-power electricity generation is sunshine industry, and current wind-driven generator uses permanent-magnet synchronous or double-fed asynchronous generator mostly,
The former has shown a large amount of of shortcoming with high costs, especially rare earth permanent-magnetic material and used in recent years, and the latter needs rotor
Double winding, double convertor system；And switch reluctance generator is simple in construction, sturdy and durable, with low cost, the strong reliability of fault-tolerance
Height, efficiency has broad application prospects also above double-fed asynchronous generator.
Wind-powered electricity generation industry, maximum power output ability is the key in generating set operation control, higher effect in the industry
Rate and benefit, bigger generating capacity power density, broader generation range is that the field especially needs.
Switch reluctance generator current transformer is the maincenter link of switch reluctance generator system operation and control, existing at present
Converter structure in, if each independent operating and the control of excitation and generating two benches, for separate excitation type, if needed for excitation
Power supply sends electric energy from power generating stage, then is self-excitation type, traditional self-excitation type for directly using generating voltage as excitation voltage,
Voltage and current fluctuation is big, needs to provide special separate excitation power supply although the fluctuation of separate excitation type voltage x current is small, adds maintenance
Workload.
Current industry also has the self-excitation type switch reluctance generator converter system of some decoupling types, and excitation voltage can also
It is separately adjustable, enhance adaptability of the system in wind-powered electricity generation field, but flexibility is not enough, for example field power supply break down or
Control is limited, and excitation voltage excursion is not wide, or only relies solely on the change of field power supply to adjust winding excitation rank
Section voltage and current, lacks the multi-faceted intensive control ability of the fast reaction to system if necessary.
In addition, in terms of very low velocity, high wind speed, high rotating speed, extremely low load is adapted to, it is also desirable to new system energy
In view of these, so as to improve whole electricity generation system can generator operation width, and then improve system power benefit and effect
Rate.
In the current numerous considerations of industry, a very big trend is so that current transformer becomes increasingly complex, required switch
More and more, the frequently switch motion of switching tube, especially PWM controls etc. are managed, substantial amounts of switching loss is caused, consumed big
Electric energy is measured, generating efficiency is reduced.
The content of the invention
Background technology more than, the present invention just proposes that a kind of wide excitation voltage regulation scope, both sides' formula regulate and control respectively
Raising excitation reinforcing ability, Multi- Switch pipe but few switching frequency, special continuous current circuit lifting power generating stage front winding electric current etc.
The converter system structure and its control method of aspect, improve the wide scope generating interval for adapting to wind characteristic and generate electricity defeated
Output capacity, improves generating efficiency and benefit, and relative then simplifies structure.
The technical scheme is that：
A kind of switching magnetic-resistance current transformer of wind-driven generator, by unsteady flow main circuit, output bus capacitor, isolated DC/DC
Converter, excitation export positive and negative two ends and connect the output bus capacitor with electric discharge main circuit composition, the unsteady flow main circuit
Positive and negative two ends, while as the positive and negative two ends of input of the isolated DC/DC converters, isolated DC/DC converters output is just
Negative two ends connect the excitation and input positive and negative two ends with electric discharge main circuit, and excitation exports positive and negative two ends with electric discharge main circuit and is connected change
Flow main circuit and input positive and negative two ends, unsteady flow main circuit output cathode end also connects excitation and the electric discharge input of electric discharge main circuit,
Excitation and electric discharge main circuit output cathode end, unsteady flow main circuit output negative pole end, unsteady flow main circuit input positive terminal short circuit；
The unsteady flow main circuit is made up of three or four unsteady flow branch circuit parallel connections, connecting valve magnetic inside each unsteady flow branch road
A phase winding of generator is hindered, contains double winding per phase winding, and separates connection, specifically, each unsteady flow branch route the
A set of winding, second set of winding, first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube,
One diode is constituted, wherein, described first set winding one end, the first switch tube anode, the second switch tube cathode are short
Connect and input positive terminal as unsteady flow main circuit, first switch tube cathode connects first diode cathode and described second set
Winding one end, the first set winding other end connects the first diode anode and the 3rd switch tube anode, and second set of winding is another
One end connection the 3rd switchs tube cathode, the 4th switch tube anode, second switch tube anode, the 5th switch tube anode,
4th switch tube cathode inputs negative pole end as unsteady flow main circuit, and the 5th switch tube cathode is used as unsteady flow main circuit output cathode
End；
The isolated DC/DC converters include electromagnetic isolation link, and it exports DC voltage value and input direct voltage
Value is equal；
The excitation is with electric discharge main circuit by the 6th switching tube, the 7th switching tube, the 8th switching tube, the second diode, the
Three diodes, the 4th diode, the first inductance, the second inductance, capacitor bank into, wherein, it is described 6th switch tube anode conduct
Excitation and electric discharge main circuit input positive terminal, the 6th switch tube cathode and second diode cathode, first inductance one
End connection, the first inductance other end is connected with the described 7th switch tube anode, the 3rd diode anode, and the 3rd diode is cloudy
Pole is connected with the capacitor anode, described second inductance one end and as excitation and electric discharge main circuit output cathode end, second
The inductance other end is connected with the 4th diode cathode, the 8th switch tube cathode, and the 8th switch tube anode is used as excitation
Unsteady flow main circuit output cathode end is connected with the electric discharge input for the main circuit that discharges, the second diode anode, the 7th switching tube are cloudy
Pole, capacitor anode, the 4th diode anode short circuit are simultaneously used as excitation and the input of electric discharge main circuit and output negative pole end.
A kind of control method of switching magnetic-resistance current transformer of wind-driven generator, be divided into three classes mode of operation：
First kind mode of operation, when genset load becomes big suddenly, or the starting and generating stage, or maximal power tracing etc.
It is quick during reinforcement excitation quick Deng needs to strengthen unsteady flow main circuit input current to improve generating set power fan-out capability
When cut this pattern, such mode of operation is divided into two kinds again：
(1) according to switch reluctance generator rotor-position, connection needs the first switch of the unsteady flow branch road of the phase winding of work
Pipe, the 3rd switching tube, the 4th switching tube closure, second switch pipe, the 5th switching tube disconnect, the 6th switching tube closure, and the 8th opens
Pipe is closed to disconnect, the 7th switching tube by the work of PWM control modes, the size of its dutycycle according to control system in work around
Current value demand regulation in group, the above stage is the excitation stage of the phase winding of switch reluctance generator, according to generator
When rotor-position detection case reaches excitation stage end position, first switch pipe, the 3rd switching tube, the 4th switching tube disconnect,
5th switching tube is closed, into power generating stage, at the end for the treatment of according to generator rotor position to power generating stage, is disconnected the 5th and is switched
Pipe, the phase winding end-of-job；
(2) in above first kind mode of operation (1), excitation and electric discharge under the conciliation of the 7th switching tube dutycycle
Phase winding electric current meets need at the end of the excitation stage that the accessible maximum output voltage of main circuit still can not cause generator
Ask, into this kind of mode of operation：The excitation stage under mode of operation is planted when the excitation stage starts with first kind mode of operation (1) to open
Each switching tube pattern is identical during the beginning, when closing to an end in the excitation stage, in advance 10% former excitation time detection winding electricity
Needed for stream can not reach during exciting current 80%, first switch pipe, the 3rd switching tube, the 4th switching tube are now disconnected, closure the
Two switching tubes so that phase winding enters freewheeling period, so that the phase winding electric current fast lifting in the case of without backward voltage, until
When starting up to power generating stage, disconnect second switch pipe, be closed at the 5th switching tube, into first kind mode of operation (1)
Pattern identical power generating stage is planted, if phase winding electric current has met demand during power generating stage starts preceding freewheeling period, is carried
Advance into power generating stage；
The 6th switching tube stays closed all the time state under such mode of operation, and the 8th switching tube remains off-state,
Second switch pipe is only just closed in freewheeling period, and first switch pipe, the 3rd switching tube, the 4th switching tube are only in excitation rank
Duan Shicai is closed, and the 5th switching tube is only just closed in power generating stage；
Equations of The Second Kind mode of operation, the rotating speed and power output of wind power generating set are in ± 10% region of respective rated value
In the range of when：
First switch pipe, second switch pipe, the 3rd switching tube, the 8th switching tube are off all the time, during work
There is no freewheeling period, excitation terminates to be directly entered power generating stage；According to generator rotor position testing result, it is necessary to certain unsteady flow branch
When road is devoted oneself to work, the 4th switching tube of unsteady flow branch road closure initially enters the excitation stage, and the of excitation and electric discharge main circuit
Six switching tubes, the on off state of the 7th switching tube are adjusted according to following principle：According to required winding current situation, when needing excitation
When voltage is that excitation reduces with the main circuit output voltage opposing busbars voltage i.e. unsteady flow main circuit output voltage that discharges, the 7th switch
Pipe disconnects, and the 6th switching tube works according to PWM control modes, and the winding current closed-loop control needed for of specific dutycycle needs true
It is fixed；When needing the increase of excitation voltage opposing busbars voltage to improve winding current, the 6th switching tube closure, the 7th switching tube is pressed
According to the work of PWM control modes, specific dutycycle according to required winding current closed-loop control it needs to be determined that；Opened when the excitation stage the 6th
Close pipe to close always, when the 7th switching tube disconnects always, winding current is just meeting the mistake of requirements at the end of the excitation stage
In poor scope, then without PWM controls；
3rd class mode of operation, diminishes suddenly when Wind turbines output end is loaded, or generating set high-speed cruising bus electricity
Press through it is high need to reduce Wind turbines power output when reducing excitation voltage, under such mode of operation：
First switch pipe, second switch pipe, the 3rd switching tube, the 7th switching tube are all the time in disconnection under such mode of operation
State, is closed, the 6th switching tube uses PWM according to the rotor-position pre-operation unsteady flow branch road excitation stage come interim 4th switching tube
Control mode, changes excitation and the output excitation voltage of electric discharge main circuit, according to rotor-position feelings by the regulation of its dutycycle
The 5th switching tube of the 4th switching tube disconnection is closed into power generating stage after the condition excitation stage terminates, when the unsteady flow branch of firm power cut-off
When causing the output bus capacitor both end voltage rise of generating output after the power generating stage end-of-job of road, or output bus electricity
Container both end voltage is when excess determines busbar voltage more than 5%, the duty of the 6th switching tube during the follow-up unsteady flow branch road excitation stage
Diminish than adjusting in proportion, during this period, the 8th switching tube closure puts output bus capacitor both sides electric energy to the second inductance
Electricity, detects when discharge loop electric current reaches limit value and disconnects the 8th switching tube.
The technique effect of the present invention mainly has：
(1) two ways realizes enhanced excitation, stackable to use, and accomplishes combination among the strong ones, i.e., make first to open in the excitation stage
Guan Guan, the 3rd switching tube closure, the 6th switching tube closure, the 7th switching tube PWM controls, then the 4th switching tube, which is closed into, encourages
During the magnetic stage, now the phase winding of excitation often covers winding and all bears whole excitation voltage value, one times of excitation voltage of relative enhancing,
And excitation is then operated in boost mode with electric discharge main circuit, that is, exports excitation voltage and be more than busbar voltage pattern enhanced excitation, enter
And improve the quick generating fan-out capability of whole electricity generation system.
(2) in converter structure of the present invention second switch pipe setting, exciting current be before power generating stage starts around
When group electric current can not reach desirable value, closure second switch pipe increases by a freewheeling period without back-pressure, can quickly be carried in the short time
Winding current is risen, and then improves power generating stage starting winding current, so as to be conducive to improving electricity generation system power output capacity.
(3) structure of unsteady flow main circuit, enhanced excitation can have both been selected as needed, and (i.e. first switch pipe and the 3rd is switched
Pipe closes excitation) mode of operation, can also selecting conventional excitation during low-load in high wind speed, (first switch pipe and the 3rd is opened
Close pipe and disconnect excitation) pattern, widen adaptability of the current transformer to external condition.
(4) excitation structure of the invention and its control method, i.e. excitation are with discharging under main circuit and its control method, not only
The decoupling of generating busbar voltage and excitation voltage is realized, and the adjustable range of excitation voltage is broad, can also keep excitation
Voltage stabilization is equal to busbar voltage.
(5) electric discharge link of the invention, load that too small or wind-force is excessive or the excessive grade of rotating speed does not need excessive electric energy and
And in the case of current transformer energy storage is excessive, can quickly discharge and give related safeguard measure, and the second inductance absorbs property
Afterwards, a paragraph is terminated after the 8th switch tube discharge and after turning off, the electric energy of the second inductance storage can feed back to charge to capacitor, from
And the work that electric energy can be used for the follow-up excitation stage is effectively utilized, do not waste, improve the returns and efficiency of whole electricity generation system.
(6) from the mode of operation of the present invention, unless in the case of relatively extremely, otherwise, near specified area
During work, first switch pipe, second switch pipe, the 3rd switching tube are normally opened on off states, not Operating In Persistent Current Mode easily, then this is several
The overall very little of the switching loss of individual switching tube, on-state loss, also often there is off-state in rest switch pipe, and the overwhelming majority is opened
Close pipe and be operated in simple venation ripple switching mode, so, although switching tube quantity is more needed for structure of the invention, but therefore produces
Loss increase it is unobvious.
Brief description of the drawings
Fig. 1 show the switching magnetic-resistance current transformer of wind-driven generator circuit structure diagram of the present invention.
In Fig. 1：1st, unsteady flow main circuit, 2, isolated DC/DC converters, 3, excitation and electric discharge main circuit.
Embodiment
A kind of switching magnetic-resistance current transformer of wind-driven generator, accompanying drawing 1 is converter circuit arrangement figure of the invention, by unsteady flow master
Circuit 1, output bus capacitor Cm, isolated DC/DC converters 2, excitation are constituted with electric discharge main circuit 3, and unsteady flow main circuit 1 is defeated
Go out the positive and negative two ends of positive and negative two ends connection output bus capacitor Cm, while being used as the input positive and negative two of isolated DC/DC converters 2
End, isolated DC/DC converters 2 export positive and negative two ends connection excitation and input positive and negative two ends, excitation and electric discharge with electric discharge main circuit 3
Main circuit 3 exports positive and negative two ends connection unsteady flow main circuit 1 and inputs positive and negative two ends, and the output cathode end of unsteady flow main circuit 1, which is also connected, encourages
The electric discharge input of magnetic and electric discharge main circuit 3, excitation and electric discharge main circuit 3 output cathode end, the output negative pole of unsteady flow main circuit 1
End, the input positive terminal short circuit of unsteady flow main circuit 1.
The switch reluctance generator of the present embodiment is the extremely double set coiled pipe types of four phases 8/6, and its unsteady flow main circuit 1 is by four unsteady flows
Branch circuit parallel connection is constituted, a phase winding of connecting valve reluctance generator inside each unsteady flow branch road, contain per phase winding two sets around
Group, and connection is separated, specifically, each unsteady flow branch route first set winding M1/N1/P1/Q1, second set of winding M2/N2/
P2/Q2, first switch pipe V1/V6/V11/V16, second switch pipe V2/V7/V12/V17, the 3rd switching tube V3/V8/V13/
V18, the 4th switching tube V4/V9/V14/V19, the 5th switching tube V5/V10/V15/V20, the first diode D1/D2/D3/D4 groups
Into, wherein, first set winding M1/N1/P1/Q1 one end, first switch pipe V1/V6/V11/V16 anodes, second switch pipe V2/
V7/V12/V17 negative electrodes short circuit simultaneously inputs positive terminal, the connection of first switch pipe V1/V6/V11/V16 negative electrodes as unsteady flow main circuit 1
First diode D1/D2/D3/D4 negative electrodes and second set of winding M2/N2/P2/Q2 one end, first set winding M1/N1/P1/Q1 are another
One end connects the first diode D1/D2/D3/D4 anodes and the 3rd switching tube V3/V8/V13/V18 anodes, second set of winding M2/
The N2/P2/Q2 other ends connect the 3rd switching tube V3/V8/V13/V18 negative electrodes, the 4th switching tube V4/V9/V14/V19 anodes, the
Two switching tube V2/V7/V12/V17 anodes, the 5th switching tube V5/V10/V15/V20 anodes, the 4th switching tube V4/V9/V14/
V19 negative electrodes input negative pole end as unsteady flow main circuit 1, and the 5th switching tube V5/V10/V15/V20 negative electrodes are used as unsteady flow main circuit 1
Output cathode end.
Isolated DC/DC converters 2 include electromagnetic isolation link, and it exports DC voltage value and input direct voltage value phase
Deng playing electromagnetic isolation and to input and output two ends filter function.
Excitation is with electric discharge main circuit 3 by the 6th switching tube V21, the 7th switching tube V22, the 8th switching tube V23, the two or two pole
Pipe D5, the 3rd diode D6, the 4th diode D7, the first inductance L1, the second inductance L2, capacitor C compositions, wherein, the 6th opens
Pipe V21 anodes are closed as excitation and the electric discharge input positive terminal of main circuit 3, the 6th switching tube V21 negative electrodes and the second diode D5 are cloudy
Pole, the connection of first inductance L1 one end, the first inductance L1 other ends and the 7th switching tube V22 anodes, the 3rd diode D6 anodes connect
Connect, the 3rd diode D6 negative electrodes are connected and defeated as excitation and electric discharge main circuit 3 with capacitor C positive poles, second inductance L2 one end
Go out positive terminal, the second inductance L2 other ends are connected with the 4th diode D7 negative electrodes, the 8th switching tube V23 negative electrodes, the 8th switching tube
V23 anodes are connected the output cathode end of unsteady flow main circuit 1, the second diode as excitation with the electric discharge input for the main circuit 3 that discharges
D5 anodes, the 7th switching tube V22 negative electrodes, capacitor C negative poles, the 4th diode D7 anodes short circuit are simultaneously used as excitation and the main electricity that discharges
Road 3 is inputted and output negative pole end.
According to the converter structure and its control system of the present embodiment, control method is divided into three classes mode of operation, according to control
Demand selection of the system processed under different loads and different operating modes.
First kind mode of operation is to become big suddenly in genset load, or the starting and generating stage, or maximal power tracing
Etc. need quick quick when strengthening excitation to strengthen unsteady flow main circuit input current to improve generating set power output energy
Cut during power, such mode of operation is specifically divided into two kinds again：
(1) according to switch reluctance generator rotor-position, it is assumed that M phase windings possess condition of work, then control first first
Switching tube V1, the 3rd switching tube V3, the 4th switching tube V4 closures, second switch pipe V2, the 5th switching tube V5 disconnect, the 6th switch
Pipe V21 is closed, and the 8th switching tube V23 disconnects, the 7th switching tube V22 by the work of PWM control modes, the size of its dutycycle according to
To the current value demand regulation in M phase windings, the above stage is the excitation stage of the phase winding of switch reluctance generator, herein
Stage is closed all the time due to the 6th switching tube V21, and the first inductance L1 is electrically charged capacitor C simultaneously when the 7th switching tube V22 is closed
There is provided excitation voltage to M phase windings, and be then during the 7th switching tube V22 shut-offs the first inductance L1 and capacitor C it is common to M phases around
Group provides excitation voltage, serves the effect of enhancing excitation；In addition, being encouraged after first switch pipe V1 and the 3rd switching tube V3 closure
Magnetic, the then excitation voltage that M1 and M2 every suits winding is born is respectively equal to excitation and the output voltage of electric discharge main circuit 3, if the
One switching tube V1 and the 3rd switching tube V3 off-states excitation, then M1 and M2 often cover winding two ends excitation voltage only have excitation with
Discharge main circuit 3 output voltage values half so that under the unsteady flow branch road excitation stage of the pattern winding voltage increase one
Times；
When reaching excitation stage end position according to generator rotor position detection case, first switch pipe V1, the 3rd
Switching tube V3, the 4th switching tube V4 disconnect, the 5th switching tube V5 closures, into power generating stage, treat according to generator rotor position
At the end of power generating stage, the 5th switching tube V5, the M phase winding end-of-jobs are disconnected.
(2) in above first kind mode of operation (1), even in the 7th switching tube V22 dutycycles reconcile lower excitation and
Phase winding electric current is expired at the end of the excitation stage that the electric discharge accessible maximum output voltage of main circuit 3 still can not cause generator
Sufficient demand, the follow-up phase winding for next entering working condition enters this kind of mode of operation, it is assumed that the unsteady flow branch where N phase windings
Road：Each switching tube when the excitation stage starts under mode of operation is planted when the excitation stage starts with first kind mode of operation (1) to act
Pattern is identical, when closing to an end in the excitation stage, and 10% former excitation time detection winding electric current is encouraged needed for can not reaching in advance
During magnetoelectricity stream 80%, first switch pipe V6, the 3rd switching tube V8, the 4th switching tube V9 are now disconnected, second switch pipe V7 is closed,
So that phase winding enters freewheeling period, now the N phase windings current loop is N1-D2-N2-V7-N1, thus N phase windings do not have
External backward voltage (busbar voltage can give winding backward voltage during power generating stage), then the loop winding current faster obtain
It must increase, when reaching power generating stage and starting, disconnect second switch pipe V7, be closed at the 5th switching tube V10, into first
Class mode of operation (1) plants pattern identical power generating stage, if power generating stage starts phase winding electric current during preceding freewheeling period
Demand has been met, then has entered power generating stage in advance.
The 6th switching tube V21 stays closed all the time state under such mode of operation, and the 8th switching tube V23 remains disconnection
State, second switch pipe V2/V7/V12/V17 is only just closed in freewheeling period, first switch pipe V1/V6/V11/V16, the
Three switching tube V3/V8/V13/V18, the 4th switching tube V4/V9/V14/V19 are only just closed at the excitation stage, the 5th switch
Pipe V5/V10/V15/V20 is only just closed in power generating stage.
Equations of The Second Kind mode of operation, the rotating speed and power output of wind power generating set are in ± 10% region of respective rated value
In the range of when：
When assuming that M phase windings need to enter working condition according to rotor-position, the first switch pipe V1 of its unsteady flow branch road, second
Switching tube V2, the 3rd switching tube V3, the 8th switching tube V23 are off all the time, do not have freewheeling period, excitation during work
End is directly entered power generating stage；The 4th switching tube V4 closures initially enter excitation stage, the 6th switching tube when excitation starts
V21, the 7th switching tube V22 on off state are adjusted according to following principle：According to required winding current situation, when needing excitation electricity
When pressure is that excitation reduces with the output voltage opposing busbars voltage of the main circuit 3 i.e. unsteady flow main circuit output voltage that discharges, the 7th switch
Pipe V22 disconnects, and the 6th switching tube V21 works according to PWM control modes, and now excitation voltage is less than busbar voltage, specific excitation
Voltage is that the 6th switching tube V21 dutycycle winding current closed-loop control needed for needs regulation；When needing excitation voltage phase
When improving winding current to busbar voltage increase, the 6th switching tube V21 closures, the 7th switching tube V22 is according to PWM control modes
Excitation voltage will be greater than busbar voltage under work, this operating mode, and the winding current closed-loop control needed for of specific dutycycle needs to adjust
Section；When the switching tube V21 of excitation stage the 6th is closed always, when the 7th switching tube V22 disconnects always, winding at the end of the excitation stage
Electric current is just being met in the error range of requirements, then is controlled without any PWM mode.
3rd class mode of operation, diminishes suddenly when Wind turbines output end is loaded, or generating set high-speed cruising bus electricity
Press through it is high need to reduce Wind turbines power output when reducing excitation voltage, under such mode of operation：
First switch pipe V1/V6/V11/V16, second switch pipe V2/V7/V12/V17, the 3rd open under such mode of operation
Close pipe V3/V8/V13/V18, the 7th switching tube V22 to be off all the time, the unsteady flow of M phase windings is assumed according to rotor-position
Branch road excitation stage interim 4th switching tube V4 closures, the 6th switching tube V21 uses PWM control modes, now excitation voltage
Busbar voltage will be less than, changed especially by the regulation of its dutycycle, the smaller then dutycycle of demand to excitation voltage is smaller, root
The 5th switching tube V5 of the 4th switching tube V4 disconnections is closed into power generating stage after terminating according to the rotor-position situation excitation stage, works as hair
When causing the output bus capacitor Cm both end voltages rise of generating output after electric stage end-of-job, or output bus capacitor
Device Cm both end voltages are when excess determines busbar voltage more than 5%, during for example N phase winding unsteady flow branch road excitation stages of follow-up work
6th switching tube V21 dutycycle is adjusted in proportion to diminish, during this period, and the 8th switching tube V23 closures will export bus capacitor
Device Cm both sides electric energy discharges to the second inductance L2, busbar voltage reduction, detects when discharge loop electric current reaches limit value and breaks again
Open the 8th switching tube V23.
Claims (2)
1. a kind of switching magnetic-resistance current transformer of wind-driven generator, is become by unsteady flow main circuit, output bus capacitor, isolated DC/DC
Parallel operation, excitation and electric discharge main circuit composition, it is characterised in that it is female that the unsteady flow main circuit exports the positive and negative two ends connection output
The positive and negative two ends of line capacitor, while being used as the positive and negative two ends of input of the isolated DC/DC converters, isolated DC/DC conversion
Device exports positive and negative two ends and connects the excitation and the positive and negative two ends of electric discharge main circuit input, excitation and electric discharge main circuit output positive and negative two
End connection unsteady flow main circuit inputs positive and negative two ends, and unsteady flow main circuit output cathode end also connects excitation and the electric discharge of electric discharge main circuit
Input, excitation and electric discharge main circuit output cathode end, unsteady flow main circuit output negative pole end, unsteady flow main circuit input positive terminal are short
Connect；
The unsteady flow main circuit is made up of three or four unsteady flow branch circuit parallel connections, connecting valve magnetic resistance hair inside each unsteady flow branch road
One phase winding of motor, contains double winding per phase winding, and separates connection, specifically, and each unsteady flow branch route first set
Winding, second set of winding, first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, one or two
Pole pipe is constituted, wherein, described first set winding one end, the first switch tube anode, the second switch tube cathode short circuit are simultaneously
Positive terminal is inputted as unsteady flow main circuit, first switch tube cathode connects first diode cathode and second set of winding
One end, the first set winding other end connects the first diode anode and the 3rd switch tube anode, second set of winding other end
Connect the 3rd switch tube cathode, the 4th switch tube anode, second switch tube anode, the 5th switch tube anode, the 4th
Tube cathode is switched as unsteady flow main circuit and inputs negative pole end, the 5th switch tube cathode is used as unsteady flow main circuit output cathode end；
The isolated DC/DC converters include electromagnetic isolation link, and it exports DC voltage value and input direct voltage value phase
Deng；
The excitation is with electric discharge main circuit by the 6th switching tube, the 7th switching tube, the 8th switching tube, the second diode, the three or two
Pole pipe, the 4th diode, the first inductance, the second inductance, capacitor bank into, wherein, it is described 6th switch tube anode is used as excitation
With electric discharge main circuit input positive terminal, the 6th switch tube cathode connects with second diode cathode, described first inductance one end
Connect, the first inductance other end be connected with the described 7th switch tube anode, the 3rd diode anode, the 3rd diode cathode and
The capacitor anode, the connection of described second inductance one end are simultaneously used as excitation and electric discharge main circuit output cathode end, the second inductance
The other end is connected with the 4th diode cathode, the 8th switch tube cathode, and the 8th switch tube anode is as excitation with putting
The electric discharge input connection unsteady flow main circuit output cathode end of electric main circuit, the second diode anode, the 7th switch tube cathode, electricity
Container negative pole, the 4th diode anode short circuit are simultaneously used as excitation and the input of electric discharge main circuit and output negative pole end.
2. a kind of control method of switching magnetic-resistance current transformer of wind-driven generator, be divided into three classes mode of operation, it is characterised in that：
First kind mode of operation, when genset load becomes big suddenly, or the starting and generating stage, or maximal power tracing etc. is needed
I.e. quick unsteady flow main circuit input current of strengthening is cut to improve during generating set power fan-out capability when quickly strengthening excitation
Enter this pattern, such mode of operation is divided into two kinds again：
(1) according to switch reluctance generator rotor-position, connection needs the first switch pipe of the unsteady flow branch road of the phase winding of work, the
Three switching tubes, the 4th switching tube closure, second switch pipe, the 5th switching tube disconnect, and the 6th switching tube closure, the 8th switching tube breaks
Open, the 7th switching tube works by PWM control modes, the size of its dutycycle is according to control system in the phase winding in work
Current value demand is adjusted, and the above stage is the excitation stage of the phase winding of switch reluctance generator, according to generator amature position
When putting detection case arrival excitation stage end position, first switch pipe, the 3rd switching tube, the 4th switching tube disconnect, and the 5th opens
Pipe closure is closed, into power generating stage, at the end for the treatment of according to generator rotor position to power generating stage, the 5th switching tube is disconnected, should
Phase winding end-of-job；
(2) in above first kind mode of operation (1), excitation and the main electricity that discharges under the conciliation of the 7th switching tube dutycycle
Phase winding electric current meets demand at the end of the excitation stage that the accessible maximum output voltage in road still can not cause generator, enters
Enter this kind of mode of operation：When the excitation stage starts when the excitation stage starts and under first kind mode of operation (1) kind mode of operation
Each switching tube pattern is identical, when closing to an end in the excitation stage, and 10% former excitation time detection winding electric current is not in advance
Needed for reaching during exciting current 80%, first switch pipe, the 3rd switching tube, the 4th switching tube are now disconnected, closure second is opened
Guan Guan so that phase winding enters freewheeling period, so that the phase winding electric current fast lifting in the case of without backward voltage, waits to reach hair
When the electric stage starts, second switch pipe is disconnected, the 5th switching tube is closed at, mould is planted into first kind mode of operation (1)
Formula identical power generating stage, if phase winding electric current has met demand during power generating stage starts preceding freewheeling period, enters in advance
Enter power generating stage；
The 6th switching tube stays closed all the time state under such mode of operation, and the 8th switching tube remains off-state, and second
Switching tube is only just closed in freewheeling period, and first switch pipe, the 3rd switching tube, the 4th switching tube are only at the excitation stage
Just close, the 5th switching tube is only just closed in power generating stage；
Equations of The Second Kind mode of operation, the rotating speed and power output of wind power generating set are in ± 10% regional extent of respective rated value
When interior：
First switch pipe, second switch pipe, the 3rd switching tube, the 8th switching tube are off all the time, are not had during work
Freewheeling period, excitation terminates to be directly entered power generating stage；According to generator rotor position testing result, it is necessary to which certain unsteady flow branch road is thrown
When entering work, the 4th switching tube closure of the unsteady flow branch road initially enters the excitation stage, and excitation is opened with the 6th of electric discharge main circuit
Guan Guan, the on off state of the 7th switching tube are adjusted according to following principle：According to required winding current situation, when needing excitation voltage
When i.e. excitation is that unsteady flow main circuit output voltage reduces with electric discharge main circuit output voltage opposing busbars voltage, the 7th switching tube breaks
Open, the 6th switching tube works according to PWM control modes, specific dutycycle according to required winding current closed-loop control it needs to be determined that；
When need excitation voltage opposing busbars voltage increase i.e. improve winding current when, the 6th switching tube close, the 7th switching tube according to
PWM control modes work, specific dutycycle according to required winding current closed-loop control it needs to be determined that；Switched when the excitation stage the 6th
Pipe is closed always, and when the 7th switching tube disconnects always, winding current is just meeting the error of requirements at the end of the excitation stage
In the range of, then without PWM controls；
3rd class mode of operation, diminishes suddenly when Wind turbines output end is loaded, or generating set high-speed cruising busbar voltage mistake
It is high to need to reduce Wind turbines power output when reducing excitation voltage, under such mode of operation：
First switch pipe, second switch pipe, the 3rd switching tube, the 7th switching tube are all the time in disconnection shape under such mode of operation
State, is closed according to the rotor-position pre-operation unsteady flow branch road excitation stage come interim 4th switching tube, and the 6th switching tube is controlled using PWM
Mode processed, changes excitation and the output excitation voltage of electric discharge main circuit, according to rotor-position situation by the regulation of its dutycycle
The 5th switching tube of the 4th switching tube disconnection is closed into power generating stage after the excitation stage terminates, when the unsteady flow branch road of firm power cut-off
When causing the output bus capacitor both end voltage rise of generating output after power generating stage end-of-job, or output bus capacitor
Device both end voltage is when excess determines busbar voltage more than 5%, the dutycycle of the 6th switching tube during the follow-up unsteady flow branch road excitation stage
Regulation diminishes in proportion, during this period, and the 8th switching tube closure will export bus capacitor both sides electric energy to the second inductive discharge,
Detect when discharge loop electric current reaches limit value and disconnect the 8th switch.
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| CN108448970A (en) * | 2018-03-21 | 2018-08-24 | 中国计量大学 | A kind of switch reluctance generator high voltage direct current unit converter system |
| CN108448974A (en) * | 2018-03-21 | 2018-08-24 | 中国计量大学 | A kind of switching magnetic-resistance wind-driven generator high pressure converter system |
| CN109921704A (en) * | 2019-04-08 | 2019-06-21 | 中国计量大学 | A kind of switch reluctance generator current transformer and its control method |
| CN109995284A (en) * | 2019-04-08 | 2019-07-09 | 中国计量大学 | A kind of self-charging switch reluctance generator converter system |
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| CN110071668A (en) * | 2019-04-08 | 2019-07-30 | 中国计量大学 | A kind of high-speed switched reluctance generator converter system |
| CN110165966A (en) * | 2019-05-31 | 2019-08-23 | 南京信息职业技术学院 | A kind of power converter of switch reluctance motor and its control method |
| CN110212827A (en) * | 2019-06-12 | 2019-09-06 | 中国计量大学 | A kind of switch reluctance generator converter system |
| CN110212826A (en) * | 2019-06-12 | 2019-09-06 | 中国计量大学 | One kind going straight up to pressure double-fed switch reluctance generator converter system |
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| CN108448970A (en) * | 2018-03-21 | 2018-08-24 | 中国计量大学 | A kind of switch reluctance generator high voltage direct current unit converter system |
| CN108448974A (en) * | 2018-03-21 | 2018-08-24 | 中国计量大学 | A kind of switching magnetic-resistance wind-driven generator high pressure converter system |
| CN110011580B (en) * | 2019-04-08 | 2020-09-11 | 中国计量大学 | Switched reluctance generator current transformation system |
| CN109995284A (en) * | 2019-04-08 | 2019-07-09 | 中国计量大学 | A kind of self-charging switch reluctance generator converter system |
| CN110011580A (en) * | 2019-04-08 | 2019-07-12 | 中国计量大学 | A kind of switch reluctance generator converter system |
| CN110071668A (en) * | 2019-04-08 | 2019-07-30 | 中国计量大学 | A kind of high-speed switched reluctance generator converter system |
| CN109921704A (en) * | 2019-04-08 | 2019-06-21 | 中国计量大学 | A kind of switch reluctance generator current transformer and its control method |
| CN110165966A (en) * | 2019-05-31 | 2019-08-23 | 南京信息职业技术学院 | A kind of power converter of switch reluctance motor and its control method |
| CN110212827A (en) * | 2019-06-12 | 2019-09-06 | 中国计量大学 | A kind of switch reluctance generator converter system |
| CN110212826A (en) * | 2019-06-12 | 2019-09-06 | 中国计量大学 | One kind going straight up to pressure double-fed switch reluctance generator converter system |
| CN110212826B (en) * | 2019-06-12 | 2021-02-12 | 中国计量大学 | Converter system of direct-boost double-fed switched reluctance generator |
| CN113890433A (en) * | 2021-09-28 | 2022-01-04 | 南京航空航天大学 | Electro-magnetic doubly salient motor capable of ensuring fault-tolerant power generation power by improving bus voltage |
| CN113890433B (en) * | 2021-09-28 | 2022-06-14 | 南京航空航天大学 | Electro-magnetic doubly salient motor capable of ensuring fault-tolerant power generation power by improving bus voltage |
| CN113889998A (en) * | 2021-10-15 | 2022-01-04 | 中国计量大学 | Direct-current wind power plant switch reluctance motor current transformation system and control method thereof |
| CN113889998B (en) * | 2021-10-15 | 2023-09-22 | 中国计量大学 | DC wind power plant switch reluctance motor conversion system and control method thereof |
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Application publication date: 20170808 Assignee: Xinchang China Metrology University Enterprise Innovation Research Institute Co.,Ltd. Assignor: China Jiliang University Contract record no.: X2021330000071 Denomination of invention: A switched reluctance wind turbine converter and its control method Granted publication date: 20190521 License type: Common License Record date: 20210816 |
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Effective date of registration: 20231130 Address after: Room 407-10, floor 4, building 2, Haichuang science and technology center, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province, 311100 Patentee after: Zhejiang Zhiduo Network Technology Co.,Ltd. Address before: 310018, No. 258, source street, Xiasha Higher Education Park, Hangzhou, Zhejiang Patentee before: China Jiliang University |