CN108736737A - A kind of the multiport converter and interlock circuit of variable-speed wind-power system - Google Patents
A kind of the multiport converter and interlock circuit of variable-speed wind-power system Download PDFInfo
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- CN108736737A CN108736737A CN201810556146.2A CN201810556146A CN108736737A CN 108736737 A CN108736737 A CN 108736737A CN 201810556146 A CN201810556146 A CN 201810556146A CN 108736737 A CN108736737 A CN 108736737A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H02J3/386—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Inverter Devices (AREA)
Abstract
This application discloses a kind of multiport converters of variable-speed wind-power system, by 11 of multiport converter switches can it is equivalent go out H bridgings parallel operation and two three-phase inverters, the function of three converters in circuit in the prior art may be implemented, the function of 16 switches is realized due to having only used 11 switches, reduce the cost of converter, totle drilling cost when power grid structure is further decreased, the utilization rate of resource is improved.Disclosed herein as well is a kind of variable-speed wind-power system and variable frequency transformer circuits, have above-mentioned advantageous effect.
Description
Technical field
This application involves technical field of wind power generation, more particularly to a kind of multiport converter of variable-speed wind-power system becomes
Speed wind-power system and variable frequency transformer circuit.
Background technology
With the continuous development of clean energy technology, wind-power electricity generation can be large-scale developed and utilized with solve energy shortage with
Problem of environmental pollution.Currently, wind energy is acquired usually using variable-ratio Wind turbines in wind-power electricity generation, with wind energy utilization
High, the advantages that transmission chain mechanical stress is small.The variable-speed wind-power unit mainly by double-fed wind power generator group at.
Specifically, referring to FIG. 1, Fig. 1 is a kind of double-fed variable-speed wind-power system that the prior art provides.
In Fig. 1, to realize the frequency control of double feedback electric engine, the converter of double-fed generator is by grid side converter device and pusher side
Converter is constituted, and needs 12 power switch tubes altogether.To realize the low voltage crossing of double-fed fan motor unit, variable frequency transformation
Device must be able to realize forward and reverse rotation, therefore the driver of its direct current generator must be allowed for realizing bidirectional electric energy flow, usually using by 4
The H bridge DC converters of a power switch tube composition.
But in order to realize that function that the prior art is provided, the variable-speed wind-power system have to open using 16 power
It closes pipe and builds variable-speed wind-power system, cost is higher, while excessive power switch tube also brings along very high power attenuation.
Therefore, how to reduce the quantity in variable-speed wind-power system using power switch tube is that those skilled in the art are of interest
Important Problems.
Invention content
The purpose of the application is to provide multiport converter, variable-speed wind-power system and the variable ratio frequency changer of kind of variable-speed wind-power system
Rate transformer circuit, by 11 of multiport converter switches can it is equivalent go out H bridgings parallel operation and two three-phase inverters,
The function of three converters in circuit in the prior art may be implemented, 16 are realized due to having only used 11 switches
The function of switch reduces the cost of converter, further decreases totle drilling cost when power grid structure, improves the utilization rate of resource.
In order to solve the above technical problems, the application provides a kind of multiport converter of variable-speed wind-power system, including：First
Output end, second output terminal, third output end, DC terminal, first switch, second switch are until the 11st switch；
The first end of the first switch, the first end of the second switch, the first end of third switch mutually interconnect
It connects, first end of the common end as the DC terminal；It is described 9th switch second end, it is described tenth switch second end,
The second end of 11st switch is connected with each other, second end of the common end as the DC terminal；
The first end of first output end respectively with the second end of the first switch and it is described 4th switch first
End connection, the second end of first output end first end with the second end of the second switch and the 5th switch respectively
Connection；First end of first phase of the second output terminal respectively with the second end of third switch and the 6th switch connects
It connects, the first end that the second phase of the second output terminal is switched with the second end of the 4th switch and the described 7th respectively connects
It connects, the first end that the third phase of the second output terminal is switched with the second end of the 5th switch and the described 8th respectively connects
It connects；First end of first phase of the third output end respectively with the second end of the 6th switch and the 9th switch connects
It connects, the first end that the second phase of the third output end is switched with the second end of the 7th switch and the described tenth respectively connects
It connects, the first end that the third phase of the third output end is switched with the second end of the 8th switch and the described 11st respectively connects
It connects.
Optionally, the first switch, the second switch are until the 11st switch includes insulated gate bipolar
Transistor IGBT and diode；
Wherein, the collector of the IGBT is connect with the cathode of the diode, common end as the first switch,
The second switch is until the described 11st first end switched；The emitter of the IGBT and the anode of the diode connect
It connects, common end is as the first switch, the second switch until the described 11st second end switched；The IGBT's
Base stage is as the first switch, the second switch until the described 11st control terminal switched.
Optionally, the first switch, the second switch are until the 11st switch includes metal oxide half
Conductor field effect transistor M OS and diode；
Wherein, the drain electrode of the MOS is connect with the cathode of the diode, and common end is as the first switch, institute
Second switch is stated until the described 11st first end switched；The source electrode of the MOS is connect with the anode of the diode, public
The second end that end is switched as the first switch, the second switch up to the described 11st altogether；The grid conduct of the MOS
The first switch, the second switch are until the described 11st control terminal switched.
Optionally, further include with the first switch, the second switch until it is described 11st switch respectively it is in parallel
Redundanter schalter.
Optionally, the Redundanter schalter is relay.
The application also provides a kind of variable-speed wind-power system, including：Wind energy conversion system, double-fed generator, variable frequency transformer, filter
Wave inductance, DC capacitor, crowbar circuits, power grid, controller and multiport converter as described above, wherein：
The wind energy conversion system is mechanically connected with the double-fed generator；The stator of the double-fed generator and the variable frequency
The rotor of transformer connects, and the stator of the variable frequency transformer is connect with the power grid；
First output end of the multiport converter is connect with the direct current generator of the variable frequency transformer；It is described more
The second output terminal of Port Translation device is connect with the first end of the filter inductance, and the second end of the filter inductance is connected to institute
It states between power grid and the stator of the variable frequency transformer；The third output end of the multiport converter is sent out with the double-fed
The rotor of motor connects；The first end of the DC terminal of the multiport converter is connect with the first end of the DC capacitor, institute
The second end for stating the DC terminal of multiport converter is connect with the second end of the DC capacitor；
The crowbar is electrically connected to the third output end of the multiport converter and turning for the double-fed generator
Between son；
The controller being connect with the multiport converter, for according to the network voltage state of acquisition, double-fed generator
Operating status and variable frequency transformer operating status, carry out rotating speed calculation processing, obtain first output end
DC voltage given value；The voltage status for obtaining the DC capacitor carries out active component of current meter according to the voltage status
Calculation handles to obtain the three-phase voltage given value of the second output terminal；When operation of power networks is normal, carries out power decoupled control and calculate
Method obtains the three-phase voltage given value of the third output end；To the DC voltage given value, the second output terminal three
The three-phase voltage given value of phase voltage given value and the third output end is modulated processing and obtains control signal, exports institute
Control signal is stated to control rotating speed, phase angle and the active power of the variable frequency transformer, by the electricity of the DC capacitor
Voltage-controlled system carries out decoupling control in the DC terminal voltage given value, and to the power of the double-fed generator.
The application also provides a kind of variable frequency transformer circuit, including：First power grid, the second power grid, variable frequency become
Depressor, compensator transformer, filter inductance, DC capacitor, controller and multiport converter as described above, wherein：
First power grid is connect with the stator of the variable frequency transformer, second power grid and the variable frequency
The rotor of transformer connects；The compensator transformer be connected on first power grid and the variable frequency transformer stator it
Between；
First output end of the multiport converter is connect with the motor of the variable frequency transformer；The multiport
The second output terminal of converter is connect with the input terminal of the compensator transformer, the third output end of the multiport converter with
The first end of the filter inductance connects, and the second end of the filter inductance is connected to the compensator transformer and the variable ratio frequency changer
Between the stator of rate transformer；The first end of the DC terminal of the multiport converter connects with the first end of the DC capacitor
It connecing, the second end of the DC terminal of the multiport converter is connect with the second end of the DC capacitor,
The controller being connect with the multiport converter, for being become according to the network voltage state and variable frequency of acquisition
The operating status of depressor carries out rotating speed calculation processing, obtains the DC voltage given value of first output end；Obtain described
The voltage and current state of one power grid, second power grid, the stator and the rotor, according to the voltage and current state into
Row reactive power calculates processing or offset voltage calculation processing obtains the three-phase voltage given value of the second output terminal；Using institute
State stator, the DC capacitor and the filter inductance voltage and current state carry out DC voltage calculation processing obtain it is described
The three-phase voltage given value of third output end；It is given to the three-phase voltage of the DC voltage given value, the second output terminal
The three-phase voltage given value of value and the third output end is modulated processing and obtains control signal, exports the control signal
To control rotating speed, phase angle and the active power of the variable frequency transformer, to first power grid and second power grid
Reactive Power Control or voltage compensation processing are carried out, and adjusts the DC terminal voltage.
A kind of multiport converter of variable-speed wind-power system provided herein, including：First output end, the second output
End, third output end, DC terminal, first switch, second switch are until the 11st switch；The first end of the first switch, institute
State second switch first end, the third switch first end be connected with each other, common end as the DC terminal first
End；The second end of 9th switch, the second end of the tenth switch, the second end of the 11st switch are connected with each other,
Second end of its common end as the DC terminal；The first end of first output end respectively with the first switch second
End and the described 4th first end that switchs connect, the second end of first output end second end with the second switch respectively
It is connected with the first end of the 5th switch；First phase of the second output terminal respectively with the third switch second end and
The first end connection of 6th switch, the second phase of the second output terminal respectively with the second end of the 4th switch and institute
State the first end connection of the 7th switch, the third phase of the second output terminal respectively with the second end of the 5th switch and described
The first end connection of 8th switch；First phase of the third output end second end and described the with the 6th switch respectively
The first ends connection of nine switches, the second phase of third output end second end and the described tenth with the 7th switch respectively
The first end of switch connects, the third phase of the third output end second end and the described 11st with the 8th switch respectively
The first end of switch connects.
By 11 of multiport converter switches can it is equivalent go out H bridgings parallel operation and two three-phase inverters, can be with
It realizes the function of three converters in circuit in the prior art, 16 switches is realized due to having only used 11 switches
Function, reduce the cost of converter, further decrease power grid structure when totle drilling cost, improve the utilization rate of resource.
The application also provides a kind of variable-speed wind-power system and variable frequency transformer circuit, has above-mentioned advantageous effect,
This will not be repeated here.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of application for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of double-fed variable-speed wind-power system that the prior art provides；
A kind of structural schematic diagram of the multiport converter for variable-speed wind-power system that Fig. 2 is provided by the embodiment of the present application；
The structural schematic diagram for another multiport converter that Fig. 3 is provided by the embodiment of the present application；
A kind of structural schematic diagram for variable-speed wind-power system that Fig. 4 is provided by the embodiment of the present application；
A kind of flow diagram for variable frequency transformer method for controlling number of revolution that Fig. 5 is provided by the embodiment of the present application；
A kind of flow diagram for DC capacitor voltage control method that Fig. 6 is provided by the embodiment of the present application；
A kind of flow diagram for modulator approach that Fig. 7 is provided by the embodiment of the present application；
A kind of structural schematic diagram for variable frequency transformer circuit that Fig. 8 is provided by the embodiment of the present application；
The structural schematic diagram for another variable frequency transformer circuit that Fig. 9 is provided by the embodiment of the present application；
A kind of flow diagram of the control method for equivalent H bridgings parallel operation that Figure 10 is provided by the embodiment of the present application；
A kind of flow diagram for reactive power control method that Figure 11 is provided by the embodiment of the present application；
A kind of flow diagram for low voltage traversing control method that Figure 12 is provided by the embodiment of the present application；
A kind of flow diagram for equivalent parallel three-phase inverter control method that Figure 13 is provided by the embodiment of the present application；
The flow chart schematic diagram for another modulator approach that Figure 14 is provided by the embodiment of the present application.
Specific implementation mode
The core of the application is to provide a kind of multiport converter of variable-speed wind-power system, variable-speed wind-power system and variable
Frequency transformer circuit, by 11 of multiport converter switches can it is equivalent go out H bridgings parallel operation and two three phase inversions
The function of three converters in circuit in the prior art may be implemented in device, and ten are realized due to having only used 11 switches
The function of six switches, reduces the cost of converter, further decreases totle drilling cost when power grid structure, improves the utilization of resource
Rate.
To keep the purpose, technical scheme and advantage of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
Specifically, referring to FIG. 2, a kind of multiport for variable-speed wind-power system that Fig. 2 is provided by the embodiment of the present application becomes
The structural schematic diagram of parallel operation.
The multiport converter may include：First output end, second output terminal, third output end, DC terminal, first open
101, second switch 102 is closed until the 11st switch 111；
The first end of first switch 101, the first end of second switch 102, the first end of third switch 103 are connected with each other,
First end of its common end as DC terminal；The second end of 9th switch 109, the second end of the tenth switch 110, the 11st switch
111 second end is connected with each other, second end of the common end as DC terminal；
The first end of first output end is connect with the first end of the second end of first switch 101 and the 4th switch 104 respectively,
The second end of first output end is connect with the first end of the second end of second switch 102 and the 5th switch 105 respectively；Second output
First phase at end is connect with the first end of the second end of third switch 103 and the 6th switch 106 respectively, and the second of second output terminal
Mutually connect respectively with the first end of the second end of the 4th switch 104 and the 7th switch 107, the third phase of second output terminal respectively with
The second end of 5th switch 105 is connected with the first end of the 8th switch 108；First phase of third output end is switched with the 6th respectively
106 second end is connected with the first end of the 9th switch 109, the second phase of third output end respectively with the 7th switch 107
Two ends are connected with 110 first ends of the tenth switch, the third phase of third output end respectively with the second end of the 8th switch 108 and the
The first end of 11 switches 111 connects.
First output end of the present embodiment meaning is two-phase port, and second output terminal and third output end are three-phase port,
Until the 11st switch 111 is the switch unit being made of switching tube, wherein switching tube can for first switch 11, second switch 12
To be power switch tube.There is general switching tube first end, second end and control terminal, controller to export control letter to control terminal
Number, to control switching tube conducting or disconnect.
Further, the present embodiment carries out Time-sharing control by controller to cascade converter, realizes the first output end and the
The independent control of two output ends, i.e., in a switch periods, Schilling first switch 101, second switch 102, the 9th switch 109
Until the 11st switch 111 is connected, the state that the first output end and third output end are complete zero at this time does not influence its output, and
103 to the 8th switch 108 of third switch forms a converter, controls the output of second output terminal；Enable again third switch 103,
6th switch, 106 to the 11st switch 111 is connected, and second output terminal and third output end are all-zero state, first switch at this time
101, second switch 102, the 4th switch 104 and the 5th switch 105 can form a converter, the first output end of control
Output；101 to the 5th switch 105 of first switch is enabled to be connected again, the first output end and second output terminal are all-zero state at this time, the
Six switches, 106 to the 11st switch 111 can form a converter, control the output of third output end.Be equivalent to it is equivalent go out
H bridges DC converter and other two three-phase inverter in the prior art.Specifically, the switch being connect with the first output end,
I.e. first switch 101, second switch 102, the 4th switch 104, the 5th switch 105 are equivalent to H bridging parallel operations, are called equivalent H bridges
Converter；The switch being connect with second output terminal, i.e. 103 to the 8th switch 108 of third switch are equivalent to grid side converter, are called
First equivalent three-phase inverter；The switch being connect with third output end, i.e. 106 to the 11st switch 111 of the 6th switch are equivalent to
Machine-side converter is called the second equivalent three-phase inverter.The prior art may be implemented by 11 switches of cascade converter
In three converters switch the function that just may be implemented for 16 in total, reduce the usage quantity switched in converter, reduce electric
Net construction cost improves resource utilization, while can also reduce the power consumption of circuit.
On the basis of embodiment shown in Fig. 2, the present embodiment mainly provides one to the switch in multiport converter can
The concrete scheme of choosing, other parts are substantially the same with a upper embodiment, and same section can refer to a upper embodiment, not do herein
It repeats.
Specifically, referring to FIG. 3, the structure for another multiport converter that Fig. 3 is provided by the embodiment of the present application is shown
It is intended to.
First switch 101, second switch 102 in the present embodiment is until the 11st switch 111 includes insulated gate bipolar
Transistor npn npn IGBT V1~11With diode D1~11；
Wherein, IGBT V1~11Collector and diode D1~11Cathode connection, common end as first switch 101,
First end of the second switch 102 up to the 11st switch 111；IGBT V1~11Emitter and diode D1~11Anode connection,
Its common end as first switch 101, second switch 102 until the 11st switch 111 second end；IGBT V1~11Base stage
As first switch 101, second switch 102 until the 11st switch 111 control terminal.
On the basis of embodiment shown in Fig. 2, the present embodiment mainly provides another to the switch in multiport converter
Optional concrete scheme, other parts are substantially the same with a upper embodiment, and same section can refer to a upper embodiment, herein not
It repeats.
First switch 101, second switch 102 in the present embodiment is until the 11st switch 111 includes metal oxide
Semiconductor field effect transistor MOS and diode；
Wherein, the cathode of the drain electrode of MOS and diode connects, and common end is as first switch 101, second switch 102
Until the first end of the 11st switch 111；The source electrode of MOS and the anode of diode connect, and common end is as first switch
101, second end of the second switch 102 up to the 11st switch 111；The grid of MOS is as first switch 101, second switch 102
Until the control terminal of the 11st switch 111.
On the basis of the scheme of all of above embodiment, the present embodiment mainly provides the switch in multiport converter
Another additional aspects, other parts are substantially the same with a upper embodiment, and same section can refer to a upper embodiment, herein not
It repeats.
The present embodiment also further includes with first switch 101, second switch 102 until the 11st switch 111 is in parallel respectively
Redundanter schalter.
Optionally, which can be relay.
Namely in one Redundanter schalter of first switch 101 to 111 parallel connection of the 11st switch, when the switch failure,
Redundanter schalter, which can be controlled, makes switch short, the other parts of circuit still can work normally.
A kind of multiport converter provided by the embodiments of the present application can be waited by 11 switches of multiport converter
H bridgings parallel operation and two three-phase inverters are imitated out, the function of three converters in circuit in the prior art may be implemented, due to
Having only used 11 switches realizes the function of 16 switches, reduces the cost of converter, further decreases power grid structure
Totle drilling cost when building improves the utilization rate of resource.
Based on a kind of multiport converter that above example is provided, the present embodiment can provide a kind of based on the multiterminal
The function of variable-speed wind-power system not only may be implemented by the multiport converter 100 in the variable-speed wind-power system of mouth converter,
The cost and power consumption of the variable-speed wind-power system can also be reduced.
Specifically, referring to FIG. 4, a kind of structural representation for variable-speed wind-power system that Fig. 4 is provided by the embodiment of the present application
Figure.
Wherein, which may include：Wind energy conversion system, double-fed generator, variable frequency transformer, filtered electrical
Sense, DC capacitor C, crowbar circuit, power grid and the multiport converter 100 such as above example, wherein：
Wind energy conversion system is mechanically connected with double-fed generator；The stator of double-fed generator connects with the rotor of variable frequency transformer
It connects, the stator of variable frequency transformer is connect with power grid；
First output end of multiport converter 100 is connect with the direct current generator of variable frequency transformer；Multiport converts
The second output terminal of device 100 is connect with the first end of filter inductance L, and the second end of filter inductance L is connected to power grid and variable ratio frequency changer
Between the stator of rate transformer；The third output end of multiport converter 100 and the rotor of double-fed generator connect；Multiport becomes
The first end of the DC terminal of parallel operation 100 is connect with the first end of DC capacitor C, and the second of the DC terminal of multiport converter 100
End is connect with the second end of DC capacitor C；
Crowbar is electrically connected between the third output end of multiport converter 100 and the rotor of double-fed generator；
The controller being connect with the multiport converter, for according to the network voltage state of acquisition, double-fed generator
Operating status and variable frequency transformer operating status, carry out rotating speed calculation processing, obtain first output end
DC voltage given value；The voltage status for obtaining the DC capacitor carries out active component of current meter according to the voltage status
Calculation handles to obtain the three-phase voltage given value of the second output terminal；When operation of power networks is normal, carries out power decoupled control and calculate
Method obtains the three-phase voltage given value of the third output end；To the DC voltage given value, the second output terminal three
The three-phase voltage given value of phase voltage given value and the third output end is modulated processing and obtains control signal, exports institute
Control signal is stated to control rotating speed, phase angle and the active power of the variable frequency transformer, by the electricity of the DC capacitor
Voltage-controlled system carries out decoupling control in the DC terminal voltage given value, and to the power of the double-fed generator.
Wherein, crowbar circuits are mainly used in the low voltage crossing technology of wind power generation inverter.It is used in wind-force
Generator amature side, for bypassing rotor-side converter.When low-voltage disturbance occurs for power grid, prevent DC bus-bar voltage excessively high
It is excessive with rotor current.
Wherein, variable frequency transformer includes double feedback electric engine and direct current generator.So the stator and double-fed of double-fed generator
The rotor of motor connects, and the stator of double feedback electric engine is connect with power grid；
To sum up, by 11 of multiport converter 100 switches can it is equivalent go out H bridgings parallel operation and two three phase inversions
The function of three converters in circuit in the prior art may be implemented in device, and ten are realized due to having only used 11 switches
The function of six switches, reduces the cost of converter, further decreases totle drilling cost when power grid structure, improves the utilization of resource
Rate.
It, can be in addition, the multiport converter 100 that is provided in all of above embodiment and on the basis of variable-speed wind-power system
Following 100 control method of multiport converter is provided.It should be noted that in variable-speed wind-power system in multiport converter
First equivalent three-phase inverter, which is called, does equivalent grid side converter, and the second equivalent three-phase inverter, which is called, does equivalent pusher side transformation
Device.
Variable frequency transformer method for controlling number of revolution
Referring to FIG. 5, a kind of stream for variable frequency transformer method for controlling number of revolution that Fig. 5 is provided by the embodiment of the present application
Journey schematic diagram.
Step 1：
Differentiate whether network voltage falls, if network voltage is within the allowable range, the rotational speed setup of variable frequency transformer
Value is 0；
If network voltage is beyond the range allowed, the rotary speed setting value of variable frequency transformer is that double-fed wind generator is specified
The difference of rotating speed and rotating speed measured value.
Step 2：
Variable frequency transformer rotating speed uses traditional DC motor speed current double closed-loop control method：
The deviation of variable frequency transformer rotary speed setting value and measured value generates armature of direct current motor by pi regulator
Given value of current value；
The deviation of armature of direct current motor given value of current value and measured value generates DC voltage given value by pi regulator.
DC capacitor voltage control method
No matter when whether network voltage falls, DC capacitor voltage control uses grid voltage orientation vector controlled skill
Art obtains net side three-phase alternating voltage given value.
Specifically, referring to FIG. 6, a kind of DC capacitor voltage control method that Fig. 6 is provided by the embodiment of the present application
Flow diagram.
This method may include：
Step 1：
Acquire the voltage V of grid sidegabc, DC capacitor voltage Vdc, acquisition filter inductance electric current igabc；
Calculate stator voltage angle θg；
Filter inductance electric current igabcI is obtained after 3/2 transformation and static/rotating coordinate transformationgd、igq；
Step 2：
Using outer voltage, the control strategy of current inner loop, the deviation of DC capacitor voltage given value and measured value is passed through
Pi regulator generates d shaft current given values
The deviation of d shaft currents given value and measured value generates d shaft voltage given values by pi regulator
The deviation of q shaft currents given value and measured value generates q shaft voltage given values by pi regulator
Step 3：
D, q shaft voltage obtain net side three-phase alternating voltage given value after rotary/static coordinate transform and 2/3 transformation
Double-fed generator power decoupled control method
When network voltage is normal, the three-phase contactors of crowbar circuits disconnects, multiport converter and rotor windings it
Between three-phase contactor be closed, double-fed generator uses and based on stator magnetic linkage oriented vector control technology controls its stator winding
Active and reactive power, generate pusher side three-phase alternating voltage given value.(because being traditional scheme and non-this patent focus,
It does not elaborate herein)
When grid voltage sags are more than setting value, the three-phase contactors of crowbar circuits is closed, multiport converter with
Three-phase contactor between rotor windings disconnects, and multiport converter does not control double fed electric machine rotor winding current.
Modulator approach
Referring to FIG. 7, a kind of flow diagram for modulator approach that Fig. 7 is provided by the embodiment of the present application.
Step 1：Offset calculates
This modulation system needs pusher side three-phase alternating voltage given value, net side three-phase alternating voltage given value and DC voltage
Given value cannot intersect, so signal should will the amount of offsetting.If offset mdc、mac1、mac2And the amplitude V of modulation reference waveac1、
Vac2、VdcMeet the condition of following formula, then can meet V alwaysdc(t)≥Vac1(t)≥Vac2(t)。
Step 2：Logic control
Wherein, DC voltage given value and mdcBe added, then make comparisons with carrier wave, obtain first switch, second switch letter
Number with signal 1；
Net side three-phase alternating voltage given value and mac1Be added, obtained signal makes comparisons with carrier wave, obtained signal with take
The signal of anti-first switch, second switch makees exclusive or, show that third is switched to the signal of the 4th switch；
Pusher side three-phase alternating voltage given value and mac2Be added, obtained signal makes comparisons with carrier wave, obtained signal with take
Anti- third, which is switched to the signal of the 4th switch, makees exclusive or, obtains the 6th switch to the signal of the 7th switch；
6th switch to the 7th switch signal negate the 9th switch to the 11st switch signal.
Based on a kind of multiport converter 100 that above example is provided, the present embodiment can provide one kind and be based on being somebody's turn to do
Variable ratio frequency changer not only may be implemented by the multiport converter 100 in the variable frequency transformer circuit of multiport converter 100
The function of rate transformer circuit can also reduce the cost and power consumption of the fault traversing circuit.
Specifically, referring to FIG. 8, a kind of knot for variable frequency transformer circuit that Fig. 8 is provided by the embodiment of the present application
Structure schematic diagram.
Wherein, which may include：First power grid, the second power grid, variable frequency transformer, compensator transformer T, filtering
The multiport converter 100 of inductance L, DC capacitor C and such as above example, wherein：
First power grid is connect with the stator of variable frequency transformer, and the rotor of the second power grid and variable frequency transformer connects
It connects；Compensator transformer T is connected between the first power grid and the stator of variable frequency transformer；
First output end of multiport converter 100 is connect with the motor of variable frequency transformer；Multiport converter 100
Second output terminal and the input terminal of compensator transformer connect, the third output end of multiport converter 100 is with filter inductance L's
First end connects, and the second end of filter inductance L is connected between compensator transformer and the stator of variable frequency transformer；Multiport
The first end of the DC terminal of converter 100 is connect with the first end of DC capacitor C, and the of the DC terminal of multiport converter 100
Two ends are connect with the second end of DC capacitor C；
The controller being connect with the multiport converter, for being become according to the network voltage state and variable frequency of acquisition
The operating status of depressor carries out rotating speed calculation processing, obtains the DC voltage given value of first output end；Obtain described
The voltage and current state of one power grid, second power grid, the stator and the rotor, according to the voltage and current state into
Row reactive power calculates processing or offset voltage calculation processing obtains the three-phase voltage given value of the second output terminal；Using institute
State stator, the DC capacitor and the filter inductance voltage and current state carry out DC voltage calculation processing obtain it is described
The three-phase voltage given value of third output end；It is given to the three-phase voltage of the DC voltage given value, the second output terminal
The three-phase voltage given value of value and the third output end is modulated processing and obtains control signal, exports the control signal
To control rotating speed, phase angle and the active power of the variable frequency transformer, to first power grid and second power grid
Reactive Power Control or voltage compensation processing are carried out, and adjusts the DC terminal voltage.
Based on the variable frequency transformer circuit that above example provides, the present embodiment is primarily directed to more in the circuit
Port Translation device 100 does one and illustrates, and other parts can refer to a upper embodiment, and this will not be repeated here.
Referring to FIG. 9, the structural representation for another variable frequency transformer circuit that Fig. 9 is provided by the embodiment of the present application
Figure.
Multiport converter 100 in the present embodiment may include：First output end, second output terminal, third output end,
DC terminal, first switch 101, second switch 102 are until the 11st switch 111；
The first end of first switch 100, the first end of second switch 102, the first end of third switch 103 are connected with each other,
First end of its common end as DC terminal；The second end of 9th switch 109, the second end of the tenth switch 110, the 11st switch
111 second end is connected with each other, second end of the common end as DC terminal；
The first end of first output end is connect with the first end of the second end of first switch 101 and the 4th switch 104 respectively,
The second end of first output end is connect with the first end of the second end of second switch 102 and the 5th switch 105 respectively；Second output
First phase at end is connect with the first end of the second end of third switch 103 and the 6th switch 106 respectively, and the second of second output terminal
Mutually connect respectively with the first end of the second end of the 4th switch 104 and the 7th switch 107, the third phase of second output terminal respectively with
The second end of 5th switch 105 is connected with the first end of the 8th switch 108；First phase of third output end is switched with the 6th respectively
106 second end is connected with the first end of the 9th switch 109, the second phase of third output end respectively with the 7th switch 107
Two ends are connected with the first end of the tenth switch 110, the third phase of third output end respectively with the second end of the 8th switch 108 and
The first end of 11 switches 111 connects；
Wherein, first switch 101, second switch 102 are until the 11st switch 111 includes insulated gate bipolar transistor
IGBT and diode；
Wherein, the cathode of the collector of IGBT and diode connects, and common end is as first switch 101, second switch
102 until the 11st switch 111 first end；The emitter of IGBT and the anode of diode connect, and common end is as first
Switch 101, second switch 102 until the 11st switch 111 second end；The base stage of IGBT is opened as first switch 101, second
Control terminal of the pass 102 up to the 11st switch 111.
In another embodiment, first switch 101, second switch 102 are until the 11st switch 111 includes metal oxidation
Object semiconductor field effect transistor MOS and diode；
Wherein, the cathode of the drain electrode of MOS and diode connects, and common end is as first switch 101, second switch 102
Until the first end of the 11st switch 111；The source electrode of MOS and the anode of diode connect, and common end is as first switch
101, second end of the second switch 102 up to the 11st switch 111；The grid of MOS is as first switch 101, second switch 102
Until the control terminal of the 11st switch 111.
On the basis of all of above embodiment, multiport converter 100 can also include and first switch 101, second
Switch 102 is up to the 11st switch 111 difference Redundanter schalter in parallel.
Optionally, Redundanter schalter can be relay.
To sum up, a kind of variable frequency transformer circuit provided by the embodiments of the present application, can pass through multiport converter
11 switches can it is equivalent go out H bridgings parallel operation, series connection three-phase inverter and three-phase inverter in parallel, it is equivalent obtain it is equivalent
H bridgings parallel operation, equivalent series three-phase inverter, equivalent parallel three-phase inverter realize original variable frequency transformer electricity respectively
The function on road realizes the function of 16 switches due to having only used 11 switches, the cost of converter is reduced, into one
Step reduces totle drilling cost of the asynchronous power grid when building, and improves the utilization rate of resource.
In addition, the basis of the multiport converter 100 and variable frequency transformer circuit provided in all of above embodiment
On, following 100 control method of multiport converter can be provided.It should be noted that the first equivalent three-phase inverter is in this reality
It applies to be called in the circuit of example and does equivalent series three-phase inverter, the second equivalent three-phase inverter, which is called, does three phase inversion of equivalent parallel
Device.
The control method of equivalent H bridgings parallel operation
By the control method rotating speed, phase angle, active power regulation can be carried out to variable frequency transformer.
Specifically, referring to FIG. 10, a kind of controlling party for equivalent H bridgings parallel operation that Figure 10 is provided by the embodiment of the present application
The flow diagram of method.
The control method may include：
Step 1：The first network voltage v is acquired using voltage sensorg1abc, the second network voltage vg2abc, stator voltage
vsabc, rotor voltage vrabc；
Utilize current sensor acquisition stator current isabc；
The rotating speed n of variable frequency transformer is acquired using speed probe；
By the first network voltage vg1abc, the second network voltage vg2abcBy digital phase-locked loop detection process, the first electricity is obtained
Net electric voltage frequency fg1, the second network voltage frequency fg2；
By stator voltage vsabc, stator current isabcIt is handled by power calculation, obtains the wattful power of variable frequency transformer
Rate PVFT；
To the second network voltage vg2abc, rotor voltage vrabcPass through three phase static two-phase static coordinate conversion process respectively,
Obtain the second network voltage vector v under two-phase stationary coordinate systemg2αβ, rotor voltage vector vrαβ；
By the second network voltage vector vg2αβIt is handled by phase calculation, obtains the second electric network voltage phase θg2；
By the second network voltage vector vg2αβ, rotor voltage vector vrαβIt is static to two cordic phase rotators to pass through two-phase respectively
Conversion process obtains the second network voltage DC component v under synchronous rotating frameg2dq, rotor voltage DC component vrdq。
Step 2：By the first mains frequency fg1, the second mains frequency fg2, rotating speed n, the second network voltage DC component vg2dq、
Rotor voltage DC component vrdq, variable frequency transformer active power PVFTIt is handled, is obtained according to predeterminated voltage governing equation
To the first voltage reference value of equivalent H bridgings parallel operationSecond voltage reference valueTertiary voltage reference value
Predeterminated voltage governing equation difference is as follows：
Wherein, Kp1And Ki1It is the proportionality coefficient and integral coefficient of equivalent H bridgings parallel operation rotating speed pi regulator respectively；Kp2With
Ki2It is the proportionality coefficient and integral coefficient of equivalent H bridgings parallel operation phase angle pi regulator respectively；Kp3And Ki3It is equivalent H bridgings respectively
The proportionality coefficient and integral coefficient of parallel operation active-power P I regulator.
Step 3：By the first voltage reference value of equivalent H bridgings parallel operationSecond voltage reference valueTertiary voltage is joined
Examine valueIt is added, obtains equivalent H bridgings parallel operation direct voltage reference value
The control method of equivalent series three-phase inverter
The equivalent series three-phase inverter that above example provides can may be used according to the current operating conditions of power grid
Following two control methods, that is, power grid uses the control method of reactive power when operation of power networks is normal, another kind is to work as
It is just switched to low voltage traversing control method when detecting Voltage Drop
Specifically, 1 is please referred to Fig.1, a kind of stream for reactive power control method that Figure 11 is provided by the embodiment of the present application
Journey schematic diagram.
This method may include：
Step 1：The first network voltage v is acquired using voltage sensorg1abc, stator voltage vsabc；
Utilize current sensor acquisition stator current isabc；
By the first network voltage vg1abc, stator voltage vsabc, stator current isabcIt is static to pass through three phase static two-phase respectively
Coordinate transform processing obtains the first network voltage vector v under two-phase stationary coordinate systemg1αβ, stator voltage vector vsαβ, stator
Current phasor isαβ；
By the first network voltage vector vg1αβ, stator voltage vector vsαβPass through phase calculation respectively to handle, obtains the first electricity
Net voltage-phase θg1, stator voltage phase thetas；
By the first network voltage vector vg1αβ, stator voltage vector vsαβ, stator current vector isαβIt is quiet to pass through two-phase respectively
The processing of two-phase rotating coordinate transformation is only arrived, the first network voltage DC component v under synchronous rotating frame is obtainedg1dq, stator
Voltage DC component vsdq, stator current DC component isdq。
Step 2：By the first network voltage DC component vg1dq, stator voltage DC component vsdq, stator current DC component
isdqIt is handled according to predeterminated voltage governing equation, obtains the voltage reference value v of equivalent series three-phase invertersccdq；
Predeterminated voltage governing equation is as follows：
Wherein, Kp4And Ki4It is the proportionality coefficient and integration system of equivalent series three-phase inverter d shaft voltage pi regulators respectively
Number, Kp5And Ki5It is the proportionality coefficient and integral coefficient of equivalent series three-phase inverter q shaft voltage pi regulators respectively.
Step 3：By the voltage reference value v of equivalent series three-phase invertersccdqTwo-phase static coordinate is rotated to by two-phase
Conversion process obtains the voltage reference value v of the equivalent series three-phase inverter under two-phase stationary coordinate systemsccαβ；
By the voltage reference value v of equivalent series three-phase invertersccαβBy the static three phase static coordinate transform processing of two-phase,
Obtain the equivalent series three-phase inverter three-phase voltage reference value v under three-phase static coordinate systemsccabc。
When detecting Voltage Drop, low voltage traversing control method is used, so that equivalent series three-phase inverter is to electricity
Net voltage compensates, that is, carries out low voltage crossing control to variable frequency transformer.
Specifically, please refer to Fig.1 2, a kind of low voltage traversing control method that Figure 12 is provided by the embodiment of the present application
Flow diagram.
This method may include：
Step 1：The first network voltage v is acquired using voltage sensorg1abc, the second network voltage vg2abc, stator voltage
vsabc, rotor voltage vrabc；
By the first network voltage vg1abc, the second network voltage vg2abcBy digital phase-locked loop detection process, the first electricity is obtained
Net electric voltage frequency fg1, the second network voltage frequency fg2；
By the first network voltage vg1abc, the second network voltage vg2abc, stator voltage vsabc, rotor voltage vrabcPass through respectively
Three phase static two-phase static coordinate conversion process obtains the first network voltage vector v under two-phase stationary coordinate systemg1αβ, second
Network voltage vector vg2αβ, stator voltage vector vsαβ, rotor voltage vector vrαβ；
By the first network voltage vector vg1αβ, the second network voltage vector vg2αβPass through phase calculation respectively to handle, obtains the
One electric network voltage phase θg1, the second electric network voltage phase θg2；
By stator voltage vector vsαβ, rotor voltage vector vrαβIt is static at two-phase rotating coordinate transformation to pass through two-phase respectively
Reason, obtains the stator voltage DC component v under synchronous rotating framesdq, rotor voltage DC component vrdq。
Step 2：By stator voltage DC component vsdq, rotor voltage DC component vrdq, the first network voltage frequency fg1,
Two network voltage frequency fg2It is handled according to predeterminated voltage governing equation, obtains the Voltage Reference of equivalent series three-phase inverter
Value vsccdq；
Predeterminated voltage governing equation difference is as follows：
Wherein, Kp6And Ki6It is the proportionality coefficient and integration system of equivalent series three-phase inverter d shaft voltage pi regulators respectively
Number, Kp7And Ki7It is the proportionality coefficient and integral coefficient of equivalent series three-phase inverter q shaft voltage pi regulators respectively.
Step 3：By the voltage reference value v of equivalent series three-phase invertersccdqTwo-phase static coordinate is rotated to by two-phase
Conversion process obtains the voltage reference value v of the equivalent series three-phase inverter under two-phase stationary coordinate systemsccαβ；
By the voltage reference value v of equivalent series three-phase invertersccαβBy the static three phase static coordinate transform processing of two-phase,
Obtain the equivalent series three-phase inverter three-phase voltage reference value v under three-phase static coordinate systemsccabc。
The control method of equivalent parallel three-phase inverter
A kind of control method of equivalent parallel three-phase inverter presented below, can make equivalent parallel three-phase inverter pair
The voltage of DC bus is adjusted.
Specifically, 3 are please referred to Fig.1, a kind of equivalent parallel three-phase inverter control that Figure 13 is provided by the embodiment of the present application
The flow diagram of method processed.
This method may include：
Step 1：Utilize voltage sensor acquisition stator voltage vsabc, DC capacitor voltage Vdc；
Utilize current sensor acquisition filter inductance electric current igscabc；
By stator voltage vsabc, filter inductance electric current igscabcPass through three phase static two-phase static coordinate conversion process respectively,
Obtain the stator voltage vector v under two-phase stationary coordinate systemsαβ, filter inductance current phasor igscαβ；
By stator voltage vector vsαβIt is handled by phase calculation, obtains stator voltage phase thetas；
By filter inductance current phasor igscαβIt is handled to two-phase rotating coordinate transformation by two-phase is static, obtains revolving synchronous
Turn filter inductance current dc component i under coordinate systemgscdq。
Step 2：By DC capacitor voltage Vdc, filter inductance current dc component igscdqAccording to predeterminated voltage governing equation
It is handled, obtains the voltage reference value v of equivalent parallel three-phase invertergscdq；
Predeterminated voltage governing equation is as follows：
Wherein, Kp8And Ki8It is the proportionality coefficient and integration system of equivalent parallel three-phase inverter d shaft current pi regulators respectively
Number, Kp9And Ki9It is the proportionality coefficient and integral coefficient of equivalent parallel three-phase inverter d shaft voltage pi regulators, K respectivelyp10With
Ki10It is the proportionality coefficient and integral coefficient of equivalent parallel three-phase inverter q shaft voltage pi regulators respectively.
Step 3：By the voltage reference value v of equivalent parallel three-phase invertergscdqTwo-phase static coordinate is rotated to by two-phase
Conversion process obtains the voltage reference value v of the equivalent parallel three-phase inverter under two-phase static coordinategscαβ；
By the voltage reference value v of equivalent parallel three-phase invertergscαβBy the static three phase static coordinate transform processing of two-phase,
Obtain the equivalent parallel three-phase inverter three-phase voltage reference value v under three-phase static coordinate systemgscabc。
The modulator approach of multiport converter
A kind of modulator approach of multiport converter presented below can become above control signal modulation to multiport
In parallel operation.
Specifically, please referring to Fig.1 4, the flow for another modulator approach that Figure 14 is provided by the embodiment of the present application illustrates
It is intended to.
This method may include：
Equivalent H bridgings parallel operation direct voltage reference value is added with offset signal 1, and obtained modulated signal makees ratio with carrier wave
Compared with obtaining bridge arm switching signal 1, HB, HC.
Equivalent series three-phase inverter three-phase voltage reference value is added with offset signal 2, obtained modulated signal and carrier wave
It makes comparisons, obtained switching signal SA1, SB1, SC1.Upper bridge arm switching signal 1, HB, HC after " non-" logical operation with open
OFF signal SA1, SB1, SC1 carry out exclusive logic operation, obtain first bridge arm switching signal M1A, M1B, M1C of centre.
Equivalent parallel three-phase inverter three-phase voltage reference value is added with offset signal 3, obtained modulated signal and carrier wave
It makes comparisons, obtained switching signal SA2, SB2, SC2.Switching signal SA2, SB2, SC2 carry out " non-" logical operation, obtain lower bridge
Arm switch signal LA, LB, LC.
Switching signal SA1, SB1, SC1 carry out distance after " non-" logical operation with switching signal SA2, SB2, SC2
Logical operation obtains second bridge arm switching signal M2A, M2B, M2C of centre.
Wherein, HB, HC correspond to first switch, second switch, and M1A, M1B, M1C correspond to third switch, the 4th switch, the 5th
It switching, M2A, M2B, M2C correspondence the 6th switchs, the 7th switchs, the 8th switch, LA, LB, LC correspondence the 9th switchs, the tenth switchs,
11st switch.
Each embodiment is described by the way of progressive in specification, the highlights of each of the examples are with other realities
Apply the difference of example, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
?.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, depends on the specific application and design constraint of technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think to exceed scope of the present application.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above to a kind of multiport converter of variable-speed wind-power system provided herein, variable-speed wind-power system and can
Frequency transformer circuit is described in detail.Specific case used herein to the principle and embodiment of the application into
Elaboration is gone, the description of the example is only used to help understand the method for the present application and its core ideas.It should be pointed out that pair
For those skilled in the art, under the premise of not departing from the application principle, the application can also be carried out
Some improvements and modifications, these improvement and modification are also fallen into the application scope of the claims.
Claims (7)
1. a kind of multiport converter of variable-speed wind-power system, which is characterized in that including：First output end, second output terminal,
Three output ends, DC terminal, first switch, second switch are until the 11st switch；
The first end of the first switch, the first end of the second switch, the first end of third switch are connected with each other,
First end of the common end as the DC terminal；The second end of 9th switch, the second end of the tenth switch, described the
The second end of 11 switches is connected with each other, second end of the common end as the DC terminal；
First end of the first end of first output end respectively with the second end of the first switch and the 4th switch connects
It connects, the first end that the second end of first output end is switched with the second end of the second switch and the described 5th respectively connects
It connects；First end of first phase of the second output terminal respectively with the second end of third switch and the 6th switch connects
It connects, the first end that the second phase of the second output terminal is switched with the second end of the 4th switch and the described 7th respectively connects
It connects, the first end that the third phase of the second output terminal is switched with the second end of the 5th switch and the described 8th respectively connects
It connects；First end of first phase of the third output end respectively with the second end of the 6th switch and the 9th switch connects
It connects, the first end that the second phase of the third output end is switched with the second end of the 7th switch and the described tenth respectively connects
It connects, the first end that the third phase of the third output end is switched with the second end of the 8th switch and the described 11st respectively connects
It connects.
2. multiport converter according to claim 1, which is characterized in that the first switch, the second switch are straight
Include insulated gate bipolar transistor IGBT and diode to the 11st switch；
Wherein, the collector of the IGBT is connect with the cathode of the diode, and common end is as the first switch, described
Second switch is until the described 11st first end switched；The emitter of the IGBT is connect with the anode of the diode,
Common end is as the first switch, the second switch until the described 11st second end switched；The base stage of the IGBT
As the first switch, the second switch until the described 11st control terminal switched.
3. multiport converter according to claim 1, which is characterized in that the first switch, the second switch are straight
Include mos field effect transistor MOS and diode to the 11st switch；
Wherein, the drain electrode of the MOS is connect with the cathode of the diode, and common end is as the first switch, described
Two switches are until the described 11st first end switched；The source electrode of the MOS is connect with the anode of the diode, common end
As the first switch, the second switch until the described 11st second end switched；Described in the grid of the MOS is used as
First switch, the second switch are until the described 11st control terminal switched.
4. multiport converter according to any one of claims 1 to 3, which is characterized in that further include being opened with described first
It closes, the second switch is until the described 11st switchs Redundanter schalter in parallel respectively.
5. multiport converter according to claim 4, which is characterized in that the Redundanter schalter is relay.
6. a kind of variable-speed wind-power system, which is characterized in that including：Wind energy conversion system, double-fed generator, variable frequency transformer, filtering
Inductance, DC capacitor, crowbar circuits, power grid, controller and such as multiport described in any one of claim 1 to 5 transformation
Device, wherein：
The wind energy conversion system is mechanically connected with the double-fed generator；The stator of the double-fed generator and the variable frequency transformation
The rotor of device connects, and the stator of the variable frequency transformer is connect with the power grid；
First output end of the multiport converter is connect with the direct current generator of the variable frequency transformer；The multiport
The second output terminal of converter is connect with the first end of the filter inductance, and the second end of the filter inductance is connected to the electricity
Between net and the stator of the variable frequency transformer；The third output end of the multiport converter and the double-fed generator
Rotor connection；The first end of the DC terminal of the multiport converter is connect with the first end of the DC capacitor, described more
The second end of the DC terminal of Port Translation device is connect with the second end of the DC capacitor；
The crowbar be electrically connected to the multiport converter third output end and the double-fed generator rotor it
Between；
The controller being connect with the multiport converter, for network voltage state, the fortune of double-fed generator according to acquisition
The operating status of row state and variable frequency transformer carries out rotating speed calculation processing, obtains the direct current of first output end
Voltage given value；The voltage status for obtaining the DC capacitor is carried out according to the voltage status at active component of current calculating
Reason obtains the three-phase voltage given value of the second output terminal；When operation of power networks is normal, carries out power decoupled control algolithm and obtain
To the three-phase voltage given value of the third output end；To the three-phase electricity of the DC voltage given value, the second output terminal
The three-phase voltage given value of pressure given value and the third output end is modulated processing and obtains control signal, exports the control
Signal processed is to control rotating speed, phase angle and the active power of the variable frequency transformer, by the voltage control of the DC capacitor
System carries out decoupling control in DC terminal voltage given value, and to the power of the double-fed generator.
7. a kind of variable frequency transformer circuit, which is characterized in that including：First power grid, the second power grid, variable frequency transformation
Device, compensator transformer, filter inductance, DC capacitor, controller and such as multiport described in any one of claim 1 to 5 change
Parallel operation, wherein：
First power grid is connect with the stator of the variable frequency transformer, second power grid and the variable frequency transformation
The rotor of device connects；The compensator transformer is connected between first power grid and the stator of the variable frequency transformer；
First output end of the multiport converter is connect with the direct current generator of the variable frequency transformer；The multiport
The second output terminal of converter is connect with the input terminal of the compensator transformer, the third output end of the multiport converter with
The first end of the filter inductance connects, and the second end of the filter inductance is connected to the compensator transformer and the variable ratio frequency changer
Between the stator of rate transformer；The first end of the DC terminal of the multiport converter connects with the first end of the DC capacitor
It connecing, the second end of the DC terminal of the multiport converter is connect with the second end of the DC capacitor,
The controller being connect with the multiport converter, for the network voltage state and variable frequency transformer according to acquisition
Operating status, carry out rotating speed calculation processing, obtain the DC voltage given value of first output end；Obtain first electricity
The voltage and current state of net, second power grid, the stator and the rotor carries out nothing according to the voltage and current state
The processing of work(power calculation or offset voltage calculation processing obtain the three-phase voltage given value of the second output terminal；Using described fixed
The voltage and current state of sub, the described DC capacitor and the filter inductance carries out DC voltage calculation processing and obtains the third
The three-phase voltage given value of output end；To the three-phase voltage given value of the DC voltage given value, the second output terminal with
And the three-phase voltage given value of the third output end is modulated processing and obtains control signal, export the control signal so as to
Rotating speed, phase angle and the active power for controlling the variable frequency transformer carry out first power grid and second power grid
Reactive Power Control or voltage compensation processing, and adjust the DC terminal voltage.
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| CN201810556146.2A CN108736737A (en) | 2018-06-01 | 2018-06-01 | A kind of the multiport converter and interlock circuit of variable-speed wind-power system |
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| CN201810556146.2A CN108736737A (en) | 2018-06-01 | 2018-06-01 | A kind of the multiport converter and interlock circuit of variable-speed wind-power system |
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| CN112448654A (en) * | 2019-08-30 | 2021-03-05 | 株洲中车时代电气股份有限公司 | Method and system for controlling magnetic suspension motor |
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| CN112448654A (en) * | 2019-08-30 | 2021-03-05 | 株洲中车时代电气股份有限公司 | Method and system for controlling magnetic suspension motor |
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Application publication date: 20181102 |