CN104901322B - Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof - Google Patents
Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof Download PDFInfo
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- CN104901322B CN104901322B CN201510266214.8A CN201510266214A CN104901322B CN 104901322 B CN104901322 B CN 104901322B CN 201510266214 A CN201510266214 A CN 201510266214A CN 104901322 B CN104901322 B CN 104901322B
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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
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Abstract
The invention discloses a current transformer virtual synchronization control system under asymmetric power grid voltage and a method thereof. A cross-coupled structure of double phase-locked and amplitude-locked loops is adopted to directly control output voltage of a current transformer to be synchronized with a power grid so that output power of the current transformer is controlled. A synchronization controller is realized by adopting positive sequence and negative sequence phase-locked and amplitude-locked devices, and change of positive and negative sequence voltage can be respectively tracked so that synchronization between the current transformer and the power grid is realized when power grid voltage is asymmetric. With application of the system and the method, the current transformer is enabled to possess capability of spontaneously providing dynamic power support without time delay to the power grid, and negative sequence current outputted by the current transformer can be eliminated and fluctuation of active power and reactive power can be suppressed when power grid is asymmetric so that advantages of virtual synchronization control can be maintained, stability is great, dynamic power supply without time delay can be spontaneously provided to the power grid, negative sequence current outputted by the current transformer when power grid voltage is asymmetric can be effectively suppressed, and thus safe and stable operation of the current transformer can be guaranteed.
Description
Technical field
The invention belongs to electric and electronic technical field, more particularly, to a kind of asymmetric lower current transformer of line voltage
Virtual synchronous control system and method.
Background technology
In recent years, with the fast development of Power Electronic Technique, virtual synchronous are controlled as current transformer emerging in recent years
Control method, is received more and more attention with electrical network close friend, dynamic support ability the features such as strong.Virtual synchronous control at this stage
It is main with adopt active power realize current transformer with the power synchronous control method of synchronized as representative, with good dynamic
Performance, but need the control of auxiliary to make current transformer and electrical network simultaneous interconnecting in startup stage using power synchronous, cause startup rank
Section control structure is complicated and needs controller to switch.
In addition, when line voltage is asymmetric particularly long-term asymmetric, due to current transformer filter reactor generally compared with
Little, the negative-sequence current that negative sequence voltage causes is larger, and can cause current transformer excessively stream or even can damage, therefore improves that current transformer is grid-connected to be set
Standby reliability and fault ride-through capacity, need to eliminate impact of the negative sequence voltage to current transformer so that current transformer runs without interruption, and holds
Continue the dynamic support for needed for electrical network is provided.
The content of the invention
For the defect of prior art, it is an object of the invention to a kind of asymmetric lower current transformer of line voltage is virtual same
Step control system and method, it is intended to which the grid-connected converter for solving to be controlled based on virtual synchronous when line voltage is asymmetric cannot suppress
The problem of negative-sequence current.
The invention provides a kind of virtual synchronous control system of the asymmetric lower current transformer of line voltage, including Synchronization Control
Device, power controller and instantaneous power computer；The first input end of instantaneous power computer is used to receive line voltage vgabc,
Second input of instantaneous power computer is used to receive power network current igabc, according to line voltage vgabcWith the power network current
igabcObtain instantaneous active power P and instantaneous reactive power Q；The first input end of power controller is calculated with the instantaneous power
The first outfan connection of device, the second input of power controller connects with the second outfan of the instantaneous power computer
Connect, the 3rd input of power controller is used to receive the active power reference value P of current transformerref, the 4th of power controller be defeated
Enter end for receiving reactive power reference qref Q of current transformerref, according to instantaneous active power P, instantaneous reactive power Q, wattful power
Rate reference value PrefWith reactive power reference qref QrefObtain positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesIt is negative
Sequence voltage d axle reference valuesNegative sequence voltage q axle reference valuesThe first input end of the isochronous controller is connected to the work(
First outfan of rate controller, the second input of the isochronous controller is connected to the second output of the power controller
End, the 3rd input of isochronous controller is connected to the 3rd outfan of the power controller, and the 4th of isochronous controller is defeated
Enter the 4th outfan that end is connected to the power controller, the 5th input of isochronous controller is used to receive the electrical network electricity
Pressure vgabc, the 6th input of isochronous controller is used to receive DC bus-bar voltage Vdc, the output, electrical network according to power controller
Voltage vgabcWith DC bus-bar voltage VdcObtain the drive signal S for driving current transformerabc。
The present invention mutually locks width device and realizes isochronous controller using positive sequence, negative phase-sequence lock, can respectively track the positive and negative sequence voltage of electrical network
Change, realizes synchronous between current transformer and electrical network when line voltage is asymmetric.
Present invention also offers a kind of virtual synchronous control method of the asymmetric lower current transformer of line voltage, including following steps
Suddenly：
S1：Collection line voltage vgabc, power network current igabcWith DC bus-bar voltage Vdc；
S2：To the line voltage vgabcCLARKE conversion is carried out, α axle line voltage v are obtainedgαWith β axle line voltage vgβ；
To the power network current igabcCLARKE conversion is carried out, α axle power network current i are obtainedgα, β axle power network current component igβ；And according to described
α axle line voltage vgαWith β axle line voltage vgβAnd the α axles power network current igα, β axle power network current igβObtain instantaneous active work(
Rate P and instantaneous reactive power Q；
S3：According to the instantaneous active power P, the instantaneous reactive power Q, current transformer active power reference value Pref
With reactive power reference qref Q of current transformerrefObtain positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesWith negative phase-sequence electricity
Pressure d axle reference valuesNegative sequence voltage q axle reference values
S4：According to the line voltage vgabc, the positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference values
The negative sequence voltage d axle reference valuesNegative sequence voltage q axle reference valuesWith the DC bus-bar voltage VdcObtain drive signal
Sabc, and drive the current transformer with realize line voltage it is asymmetric under Synchronization Control.
Grid-connected converter adopts method of the present invention, decomposes without the need for complicated positive-negative sequence and without the need for positive-negative sequence current control
Make, the advantage that virtual synchronous can not only be kept to control, preferable stability and spontaneously for electrical network carry no-delay dynamic work(
Rate is supported, but also effectively suppresses the negative-sequence current of the asymmetric period current transformer output of line voltage, ensures virtual synchronous control
The safe and stable operation of current transformer and electrical network friendly.
Description of the drawings
Fig. 1 is the virtual synchronous control system controller chassis of the asymmetric lower current transformer of line voltage provided in an embodiment of the present invention
Figure；
Fig. 2 is isochronous controller control block diagram provided in an embodiment of the present invention；
Fig. 3 is that the provided in an embodiment of the present invention first lock mutually locks width device control block diagram；
Fig. 4 is that the provided in an embodiment of the present invention second lock mutually locks width device control block diagram；
Fig. 5 is the provided in an embodiment of the present invention first feedforward computer control block diagram；
Fig. 6 is the second feedforward controller control block diagram provided in an embodiment of the present invention；
Fig. 7 realizes block diagram for the first coordinate converter provided in an embodiment of the present invention；
Fig. 8 realizes block diagram for the second coordinate converter provided in an embodiment of the present invention；
Fig. 9 is the simulated effect figure using power synchronous control and isochronous controller of the present invention, wherein, (a) represent
Output current of converter when being controlled using power synchronous；B () is using current transformer output electricity during isochronous controller of the present invention
Stream；C () is that current transformer exports active, reactive power when being controlled using power synchronous；D () is using Synchronization Control of the present invention
Current transformer exports active, reactive power during device.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the virtual synchronous control system block diagram of the asymmetric lower current transformer of line voltage, for convenience of description, only
The part related to the embodiment of the present invention is shown, details are as follows：
The virtual synchronous control system of the asymmetric lower current transformer of line voltage includes isochronous controller 1, the and of power controller 2
Instantaneous power computer 3；The first input end of instantaneous power computer 3 is used to receive line voltage vgabc, instantaneous power calculating
Second input of device 3 is used to receive power network current igabc, according to line voltage vgabcWith the power network current igabcObtain instantaneous
Active-power P and instantaneous reactive power Q；By line voltage vgabcWith electric current igabc, converted using CLARKE, obtain line voltage α axles
Component vgα, beta -axis component vgβAnd power network current α axle component igα, beta -axis component igβ, and according to equation below, calculate instantaneous power P and
Q；The first input end of power controller 2 is connected with the first outfan of instantaneous power computer 3,
Second input of power controller 2 is connected with the second outfan of the instantaneous power computer 3, and the of power controller 2
Three inputs are used to receive the active power reference value P of current transformerref, the 4th input of power controller 2 is used to receive unsteady flow
Reactive power reference qref Q of deviceref, according to the instantaneous active power P, the instantaneous reactive power Q, active power ginseng
Examine value PrefWith reactive power reference qref QrefObtain positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesNegative phase-sequence
Voltage d axle reference valuesNegative sequence voltage q axle reference values
In embodiments of the present invention, power controller 2 includes a PR controllers, the 2nd PR controllers；First PR is controlled
Device input and subtractor outputs △ P, outfan isSubtractor is used to calculate active power reference value PrefInstantaneously have
The poor △ P of work(power P；The 2nd PR controllers input and subtractor outputs △ Q, outfan is positive sequence voltage d axles ginseng
Examine valueSubtractor is used to calculate reactive power reference qref QrefWith the poor △ Q of instantaneous reactive power Q；Second lock is mutually locked into width device
Voltage reference value negative sequence voltage d axle reference valuesNegative sequence voltage q axle reference values0 is set to, by the power controller
The voltage reference value that first lock mutually locks width device can be worth to according to power reference, the second lock is mutually locked into the Voltage Reference of width device
It is the impact in order to eliminate electrical network negative phase-sequence voltage to current transformer that value is set to 0, so as to reach the purpose for eliminating negative current.
In embodiments of the present invention, the first input end of isochronous controller 1 is connected to the first output of power controller 2
End, the second input of isochronous controller 1 is connected to the second outfan of power controller 2, the 3rd input of isochronous controller 1
End is connected to the 3rd outfan of the power controller 2, and the 4th input of isochronous controller 1 is connected to power controller 2
The 4th outfan, the 5th input of isochronous controller 1 is used to receive the line voltage vgabc, the of isochronous controller 1
Six inputs are used to receive DC bus-bar voltage Vdc, the output, line voltage v according to power controller 2gabcIt is female with the direct current
Line voltage VdcObtain the drive signal S for driving current transformerabc。
Virtual synchronous control system spontaneously can provide no-delay inertial response for system in the present invention, there is provided dynamic work(
Rate is supported, and at the same time virtual synchronous control system of the present invention can simultaneously track electrical network positive sequence voltage, negative sequence voltage change,
And the negative-sequence current produced by electrical network negative phase-sequence voltage is eliminated when line voltage is asymmetric, the safety and stablization of safeguards system are transported
OK.
Fig. 2 shows the control block diagram of isochronous controller provided in an embodiment of the present invention 1；Isochronous controller 1 includes
The lock of CLARKE changers 11, first is mutually locked width device 12, the first coordinate converter 13, second and is locked and mutually lock width device 14, the change of the second coordinate
The feedforward feedforward computer 17 of computer 16, second of parallel operation 15, first, PWM generator 18, first adder G1, second add
Musical instruments used in a Buddhist or Taoist mass G2, the 3rd adder G3, the 4th adder G4, fifth adder G5 and the 6th adder G6；First lock mutually locks width device 12
First input end as the isochronous controller 1 first input end and receive positive sequence voltage d axle reference valuesDescribed
One lock mutually locks the second input of width device 12 as the second input of the isochronous controller 1 and receives positive sequence voltage q axles ginseng
Examine valueThe 3rd input that first lock mutually locks width device 12 is used to receive the 3rd subtractor G3 output electrical network positive sequence voltage α
Axle component vgα1, mutually the 4th input of lock width device 12 is used to receive the 4th subtractor G4 output electrical network positive sequence electricity first lock
Pressure beta -axis component vgβ1；The first input end of first coordinate converter 13 is connected to first lock and mutually locks the first of width device 12
Outfan, the second input of first coordinate converter 13 is connected to the second output that first lock mutually locks width device 12
End；The input of the CLARKE changers 11 as the isochronous controller 1 the 5th input and receive electrical network electricity
Pressure vgabc；Second lock is mutually locked the first input end of width device 14 as the 3rd input of the isochronous controller 1 and is received
Negative sequence voltage d axle reference valuesSecond lock mutually locks the second input of width device 14 as the of the isochronous controller 1
Four inputs simultaneously receive negative sequence voltage q axle reference valuesThe 3rd input that second lock mutually locks width device 14 is used to receiving the
One subtractor G1 exports electrical network negative phase-sequence voltage α axle component vgα2, mutually the 4th input of lock width device 14 is used to receive second lock
Second subtractor G2 exports electrical network negative phase-sequence voltage beta -axis component vgβ2；The first input end of second coordinate converter 15 is connected to
Second lock mutually locks the first outfan of width device 14, and the second input of second coordinate converter 15 is connected to described the
Two locks mutually lock the second outfan of width device 14；The first input end of the first feedforward computer 16 is connected to the first lock phase
The first input end of lock width device 12 simultaneously receives positive sequence voltage d axle reference valuesSecond input of the first feedforward computer 16
End is connected to first lock and mutually locks the second input of width device 12 and receive positive sequence voltage q axle reference valuesBefore described first
3rd input of feedback computer 16 is connected to the second outfan positive sequence voltage phase theta that first lock mutually locks width device 12+；Institute
The first input end for stating the second feedforward computer 17 is connected to the first input end that second lock mutually locks width device 14, and described second
Second input of feedforward computer 17 is connected to the second input that second lock mutually locks width device 14, the second feedforward meter
The 3rd input for calculating device 17 is connected to the second outfan that second lock mutually locks width device 14；The of the first adder G1
One input is connected to the first outfan of the CLARKE changers 11, the second input connection of the first adder G1
To the first outfan of first coordinate converter 13, the 3rd input of the first adder G1 is connected to described first
First outfan of feedforward computer 16；The outfan of the first adder G1 is connected to second lock and mutually locks width device 14
3rd input；The first input end of the second adder G2 is connected to the second outfan of the CLARKE changers 11,
Second input of the second adder G2 is connected to the second outfan of first coordinate converter 13, and described second adds
3rd input of musical instruments used in a Buddhist or Taoist mass G2 is connected to the second outfan of the first feedforward computer 16, and the second adder G2's is defeated
Go out end and be connected to the 4th input that second lock mutually locks width device 14；The first input end of the 3rd adder G3 is connected to
First outfan of second coordinate converter 15, the second input of the 3rd adder G3 is connected to CLARKE conversion
First outfan of device 11, the 3rd input of the 3rd adder G3 is connected to the first output of the second feedforward computer 17
End, the outfan of the 3rd adder G3 is connected to the 3rd input that first lock mutually locks width device 12；Described 4th adds
Musical instruments used in a Buddhist or Taoist mass G4 first input ends are connected to the second outfan of second coordinate converter 15, and the second input is connected to described
Second outfan of CLARKE changers 11, the 3rd input is connected to the second outfan of the second feedforward computer 17,
Outfan is connected to the 4th input that first lock mutually locks width device 12；The first input end connection of fifth adder G5
To the first outfan of first coordinate converter 13, the second input is connected to the first of second coordinate converter 15
Outfan；The first input end of the 6th adder G6 is connected to the second outfan of first coordinate converter 13, the
Two inputs are connected to the second outfan of the second coordinate converter 15；The first input end of the PWM generator 18 connects
The outfan of fifth adder G5 is connected to, the second input of the PWM generator 18 is connected to the described 6th and adds
The outfan of musical instruments used in a Buddhist or Taoist mass G6, the 3rd input of the PWM generator 18 is received as the 6th input of isochronous controller 1
The DC bus-bar voltage Vdc；Several outfans of the PWM generator 18 are used for defeated as the outfan of isochronous controller 1
Go out drive signal Sabc。
Virtual synchronous control system of the present invention is mutually to lock width ring using two locks to connect using cross-couplings and work(
The mode of rate instruction feedforward eliminates influencing each other between positive sequence, negative sequence voltage, so as to ensure two locks mutually lock width ring respectively with
Track electrical network positive sequence voltage and negative sequence voltage.
Fig. 3 shows that the first lock mutually locks width device control block diagram；First lock mutually locks width device 12 includes a PARK changers
121st, first integrator 122, second integral device 123, the first proportionality coefficient generator 124, third integral device the 125, the 4th are integrated
Device 126, the second proportionality coefficient generator 127, the 7th subtractor G7, the 8th adder G8 and the 9th adder G9；Described first
The first input end of PARK changers 121 is used for the first lock and mutually locks the input signal electrical network positive sequence voltage α axle components of width device 12 first
vgα1, the second input is used to receiving the first lock mutually locks the input signal electrical network positive sequence voltage beta -axis component v of width device 12 secondgβ1, the 3rd
Input is used to receive the 9th adder G9 outfan θ+；The input of the first integrator 122 is connected to a PARK
Convert 121 second outfans；The input of second integral device 123 is connected to the first integrator 122；First ratio
The input of coefficient producer 124 is connected to the outfan of the first integrator 122；The input of third integral device 125 connection
To the outfan of the 7th subtractor G7；The input of 4th integrator 126 is connected to the defeated of the third integral device 125
Go out end；The input of second proportionality coefficient generator 127 is connected to the outfan of third integral device 125；Described 7th subtracts
Musical instruments used in a Buddhist or Taoist mass G7 first input ends are connected to the first outfan of a PARK changers, the second inputs of the 7th subtractor G7
The 8th adder G8 outfan is connected to, the 7th subtractor G7 outfans are connected to the third integral device 125
Input；The 8th adder G8 first input end is connected to the outfan of the 4th integrator 126, the 8th addition
The inputs of device G8 second are connected to the outfan of the second proportionality coefficient generator 127, the output of the 8th adder G8
End is connected to second input of the 7th subtractor G7, the outfan θ of the 8th adder G8+Width device is mutually locked as the first lock
12 first outfans；The first input end of the 9th adder G9 is connected to the outfan of the second integral device 123, described
Second input of the 9th adder G9 is connected to the outfan of the first proportionality coefficient generator 124, the 9th addition
The outfan of device G9 is connected to the input of a PARK changers 121 the 3rd, the output terminals A of the 8th adder G8+As
First lock mutually locks the outfan of width device 12 second.
Fig. 4 shows that the second lock provided in an embodiment of the present invention mutually locks width device control block diagram；Second lock is mutually locked width device 14 and is wrapped
Include the 2nd PARK changers 141, the 5th integrator 142, the 6th integrator 143, the 3rd proportionality coefficient generator 144, the 7th product
Point device 145, the 8th integrator 146, the 4th proportionality coefficient generator 147, the tenth adder G10, the 11st adder G11 and the
12 adders G12；The first input end of 2nd PARK changers 141 is used for the second lock and mutually locks the input signal of width device 14 first
Electrical network negative phase-sequence voltage α axle component vgα2, the second input is used to receiving the second lock mutually locks the input signal electrical network negative phase-sequence of width device 14 second
Voltage beta -axis component vgβ2, the 3rd input is connected to the 9th adder G12 outfan θ-；The input of 5th integrator 142
It is connected to the 2nd PARK and converts 141 second outfans；The input of 6th integrator 143 is connected to the 5th integrator 142；The
The input of three proportionality coefficient generator 144 is connected to the outfan of the 5th integrator 142；The input of 7th integrator 145 is connected to
The outfan of the 7th subtractor G10；The input of 8th integrator 146 is connected to the outfan of the 7th integrator 145；
The input of 4th proportionality coefficient generator 147 is connected to the outfan of the 7th integrator 145；Tenth subtractor G10 first is defeated
Enter end and be connected to the outfan of the 2nd PARK changers 141 first, the tenth the second inputs of subtractor G10 are connected to the 11st addition
Device G11 outfans, the tenth subtractor G10 outfans are connected to the input of the 7th integrator 145；12nd adder G12
One input is connected to the outfan of the 6th integrator 143, and the 12nd the second input of adder G12 is connected to the 3rd ratio system
The outfan of number producer 144, the outfan of the 12nd adder G12 is connected to second input of the tenth subtractor G10, the
The outfan θ of 12 adders G12-The outfan of width device 14 first is mutually locked as the first lock；The first of 11st adder G11 is defeated
Enter the outfan that end is connected to the 8th integrator 146, the second input of the 11st adder G11 is connected to the 4th proportionality coefficient
The outfan of generator 147, the outfan of the 11st adder G11 is connected to the input of a PARK changers 141 the 3rd, the
The output terminals A of 11 adders G11+The outfan of width device 14 second is mutually locked as the second lock.
Lock of the present invention mutually locks width ring can directly obtain the amplitude and phase place of current transformer output voltage according to electrical network, it is ensured that
Built-in potential output voltage is synchronous with line voltage；Mutually locking width ring using the lock need not gather the instantaneous power of current transformer, open
The dynamic stage, without the need for assist control, can directly drive current transformer output voltage and the electrical network same period, and control structure is simple.
Fig. 5 shows the first feedforward computer control block diagram；First feedforward computer 16 occurs including the first cosine function
Device 161, the first Sine Function Generator 162, the first multiplier 163, the second multiplier 164, the 3rd multiplier the 165, the 4th are taken advantage of
Musical instruments used in a Buddhist or Taoist mass 166, the 13rd adder G13 and the 14th adder G14；The input of first cosine function generator 161 is used to receive
3rd input signal positive sequence voltage phase theta of the first feedforward computer 16+；The input of first Sine Function Generator 162 is used for
Receive the 3rd input signal positive sequence voltage phase theta of the first feedforward computer 16+；The first input end of first multiplier 163
For receiving the first input signal positive sequence voltage d axle reference values of the first feedforward computer 16First multiplier 163 second
Input is connected to the outfan of the first cosine function generator 161；The first input end of second multiplier 164 is used to receive described
Second input signal positive sequence voltage q axle reference values of the first feedforward computer 16The input of second multiplier 164 second connects
It is connected to the outfan of the first Sine Function Generator 162；The first input end of 3rd multiplier 165 is used to receive the first feedforward calculating
Second input signal positive sequence voltage q axle reference values of device 16The input of 3rd multiplier 165 second is connected to the first cosine
The outfan of functional generator 161；The first input end of 4th multiplier 166 is used to receiving first and feedovers the first defeated of computer 16
Enter signal positive sequence voltage d axle reference valuesThe input of 4th multiplier 166 second is connected to the first Sine Function Generator 162
Outfan；13rd subtractor G13 first input ends are connected to the outfan of the first multiplier 163, the 13rd subtractor G13
Two inputs are connected to the outfan of the second multiplier 164, and the 13rd subtractor G13 outfans are used as the first feedforward computer 16
First outfan14th adder G14 first input end is connected to the outfan of the 3rd multiplier 165, the 14th adder
The inputs of G14 second are connected to the outfan of the 4th multiplier 166, and the 14th adder G14 outfan is calculated as the first feedforward
Second outfan of device 16
Fig. 6 is the control block diagram of the second feedforward computer provided in an embodiment of the present invention.Second feedforward computer 17 includes
Second cosine function generator 161, the second Sine Function Generator 162, the 5th multiplier 163, the 6th multiplier the 164, the 7th
Multiplier 165, the 8th multiplier 166, the 15th adder G13 and the 16th adder G14；Second cosine function generator
171 inputs are used to receive the 3rd input signal negative sequence voltage phase theta of the second feedforward computer 17-；Second SIN function is sent out
The raw input of device 172 is used to receive the 3rd input signal negative sequence voltage phase theta of the second feedforward computer 17-；5th multiplier
173 first input ends are used to receive the first input signal negative sequence voltage d axle reference values of the second feedforward computer 175th
The input of multiplier 173 second is connected to the outfan of the second cosine function generator 171；6th multiplier 174 first is input into
Hold the second input signal negative sequence voltage q axle reference values for receiving the second feedforward computer 176th multiplier 174
Two inputs are connected to the outfan of the second Sine Function Generator 172；The first input end of 7th multiplier 175 is used to receive the
Second input signal negative sequence voltage q axle reference values of two feedforward computers 17The input of 7th multiplier 175 second connects
To the outfan of the second cosine function generator 171；The first input end of 8th multiplier 176 is used to receive the second feedforward computer
17 the first input signal negative sequence voltage d axle reference valuesThe input of 8th multiplier 176 second is connected to the second sinusoidal letter
The outfan of number generator 172；15th subtractor G15 first input ends are connected to the outfan of the 5th multiplier 173, and the 15th
The inputs of subtractor G15 second are connected to the outfan of the 6th multiplier 174, and the 15th subtractor G15 outfans are used as before second
First outfan of feedback computer 1716th adder G16 first input end is connected to the outfan of the 7th multiplier 175,
16th the second input of adder G16 is connected to the outfan of the 8th multiplier 176, the 16th adder G16 outfan conduct
Second outfan of the first feedforward computer 17
Feedforward controller is adopted to be mutually to lock width with the second lock to avoid the first lock from mutually locking width ring quiescent point in the present invention
Influencing each other for ring quiescent point, ensures that lock mutually locks the precision that width ring detects line voltage.
Present invention also offers a kind of virtual synchronous control method of the asymmetric lower current transformer of line voltage, specifically includes down
State step：
S1：Collection line voltage vgabc, power network current igabcWith DC bus-bar voltage Vdc；
S2：To the line voltage vgabcCLARKE conversion is carried out, α axle line voltage v are obtainedgαWith β axle line voltage vgβ；
To the power network current igabcCLARKE conversion is carried out, α axle power network current i are obtainedgα, β axle power network current component igβ；And according to described
α axle line voltage vgαWith β axle line voltage vgβAnd the α axles power network current igα, β axle power network current igβObtain instantaneous active work(
Rate P and instantaneous reactive power Q；
S3：According to the instantaneous active power P, the instantaneous reactive power Q, current transformer active power reference value Pref
With reactive power reference qref Q of current transformerrefObtain positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesWith negative phase-sequence electricity
Pressure d axle reference valuesNegative sequence voltage q axle reference values
S4：According to the line voltage vgabc, the positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference values
The negative sequence voltage d axle reference valuesNegative sequence voltage q axle reference valuesWith the DC bus-bar voltage VdcObtain drive signal
Sabc, and drive the current transformer with realize line voltage it is asymmetric under Synchronization Control.Grid-connected converter is using of the present invention
Method, decompose without the need for complicated positive-negative sequence and control without the need for positive-negative sequence current, the excellent of virtual synchronous control can not only be kept
Point, preferable stability and spontaneously carries no-delay dynamic power and supports for electrical network, but also effectively suppresses line voltage not
The negative-sequence current of current transformer output during symmetrical, ensures that the safe and stable operation of virtual synchronous control current transformer and electrical network are friendly
Property.
Wherein, step S4 is specially：
S41：By α axle line voltage vgαWith α axle negative phase-sequence control voltagesAnd α axle negative phase-sequence feed-forward voltagesDiffer from, obtain electricity
Net positive sequence voltage α axle component vgα1；By β axle line voltage vgβWith β axle negative phase-sequence control voltagesAnd β axle negative phase-sequence feed-forward voltagesMake
Difference, obtains electrical network positive sequence voltage beta -axis component vgβ1；
S42：By the electrical network positive sequence voltage α axle component vgα1, the electrical network positive sequence voltage beta -axis component vgβ1And the positive sequence
Voltage d axle reference valuesThe positive sequence voltage q axle reference valuesWidth is mutually locked through lock to process, obtain positive sequence control voltage width
Value A+And phase theta+；
S43：By positive sequence control voltage amplitude A+And phase theta+, through the conversion of polar coordinate to rectangular coordinate, obtain α axle positive sequences
Control voltageβ axle positive sequence control voltages
S44：By α axle line voltage vgαWith α axle positive sequence control voltagesAnd α axle positive sequence feed-forward voltagesDiffer from, obtain electrical network
Negative sequence voltage α axle component vgα2；By β axle line voltage vgβWith β axle positive sequence control voltagesAnd β axle positive sequence feed-forward voltagesMake
Difference, obtains electrical network negative phase-sequence voltage beta -axis component vgβ2；
S45：By electrical network negative phase-sequence voltage α axle component vgα2, electrical network negative phase-sequence voltage beta -axis component vgβ2And the reference of negative sequence voltage d axles
ValueNegative sequence voltage q axle reference valuesJing locks are mutually locked width and are processed, and obtain negative phase-sequence control voltage amplitude A-And phase theta-；
S46：By negative phase-sequence control voltage amplitude A-And phase theta-Through the conversion of polar coordinate to rectangular coordinate, α axle negative phase-sequence controls are obtained
Voltage processedβ axle negative phase-sequence control voltages
S47：According to the positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesWith positive sequence control voltage phase
Position θ+, calculate the feedforward of α axles positive sequenceβ axles positive sequence feedoversAccording to the negative sequence voltage d axle reference valuesNegative sequence voltage q axles
Reference valueWith negative phase-sequence control voltage phase theta-, calculate the feedforward of α axles negative phase-sequenceβ axles negative phase-sequence feedovers
S48：By α axle positive sequence control voltagesWith α axle negative phase-sequence control voltagesSummation, obtains α axle control voltages vcα；By β axles
Positive sequence control voltageWith β axle negative phase-sequence control voltagesSummation, obtains β axle control voltages vcβ；
S49：By α axle control voltages vcα, β axle control voltages vcβWith DC bus-bar voltage VdcIt is used for Jing after PWM
Drive switching signal S of current transformerabc。
Grid-connected converter adopts method of the present invention, decomposes without the need for complicated positive-negative sequence and without the need for positive-negative sequence current control
Make, the advantage that virtual synchronous can not only be kept to control, preferable stability and spontaneously for electrical network carry no-delay dynamic work(
Rate is supported, but also effectively suppresses the negative-sequence current of the asymmetric period current transformer output of line voltage, ensures virtual synchronous control
The safe and stable operation of current transformer and electrical network friendly.
Fig. 9 is the simulated effect figure using power synchronous control and isochronous controller of the present invention.It is seen that
When containing 2% negative sequence voltage in line voltage, employing synchronous control system of the present invention can effectively eliminate current transformer
The negative-sequence current of output, so as to reduce the total current of current transformer output, and can effectively suppress the fluctuation of current transformer output；And
Using the negative-sequence current that the current transformer of power synchronous control is larger because negative sequence voltage is caused, cause output current of converter mistake
Greatly, it is grid-connected in this emulation to take disposal means, but current transformer can be caused to burn in actual motion system or even threatened whole
The safety and stablization operation of electrical network.The present invention mutually locks width device and constitutes new isochronous controller using two locks.It is existing virtual same
Step control method is according to instantaneous power come synchronously, before starting, closing a floodgate, current transformer output instantaneous power is 0, it is impossible to by power
It is synchronous, therefore additional startup Synchronization Control is needed, and adopt isochronous controller of the present invention directly to control current transformer output
Voltage is synchronous with line voltage so that current transformer start-up course is convenient, simple, fast.In addition, when line voltage is asymmetric,
Negative sequence component in exporting negative sequence voltage to offset line voltage using the controllable current transformer of isochronous controller of the present invention, enters
And eliminate the negative-sequence current of current transformer output and suppress active, reactive power 2 frequencys multiplication to pulse, ensure current transformer in line voltage
Safe and stable operation when asymmetric.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (6)
1. the virtual synchronous control system of the asymmetric lower current transformer of a kind of line voltage, it is characterised in that including isochronous controller
(1), power controller (2) and instantaneous power computer (3)；
The first input end of the instantaneous power computer (3) is used to receive line voltage vgabc, the instantaneous power computer
(3) the second input is used to receive power network current igabc, according to the line voltage vgabcWith the power network current igabcObtain
Instantaneous active power P and instantaneous reactive power Q；
The first input end of the power controller (2) is connected with the first outfan of the instantaneous power computer (3), described
Second input of power controller (2) is connected with the second outfan of the instantaneous power computer (3), the Power Control
3rd input of device (2) is used to receive the active power reference value P of current transformerref, the 4th of the power controller (2) be defeated
Enter end for receiving reactive power reference qref Q of current transformerref, according to the instantaneous active power P, the instantaneous reactive power
Q, the active power reference value PrefWith reactive power reference qref QrefObtain positive sequence voltage d axle reference valuesPositive sequence electricity
Pressure q axle reference valuesNegative sequence voltage d axle reference valuesNegative sequence voltage q axle reference values
The first input end of the isochronous controller (1) is connected to the first outfan of the power controller (2), the synchronization
Second input of controller (1) is connected to the second outfan of the power controller (2), the isochronous controller (1)
3rd input is connected to the 3rd outfan of the power controller (2), and the 4th input of the isochronous controller (1) connects
The 4th outfan of the power controller (2) is connected to, the 5th input of the isochronous controller (1) is used to receive the electricity
Net voltage vgabc, the 6th input of the isochronous controller (1) is used to receive DC bus-bar voltage Vdc, according to the power control
The output of device (2) processed, the line voltage vgabcWith the DC bus-bar voltage VdcObtain for driving the driving of current transformer to believe
Number Sabc；
The isochronous controller (1) mutually locks width device (12), the first coordinate converter including CLARKE changers (11), the first lock
(13), the second lock mutually locks width device (14), the second coordinate converter (15), the first feedforward computer (16), the second feedforward computer
(17), PWM generator (18), first adder G1, second adder G2, the 3rd adder G3, the 4th adder G4,
Five adders G5 and the 6th adder G6；
It is described first lock mutually lock width device (12) first input end as the isochronous controller (1) first input end and receive
Positive sequence voltage d axle reference valuesFirst lock mutually locks the second input of width device (12) as the isochronous controller (1)
The second input and receive positive sequence voltage q axle reference valuesThe 3rd input that first lock mutually locks width device (12) is used for
Receive the 3rd subtractor G3 output electrical network positive sequence voltage α axle component vgα1, described first locks the 4th input for mutually locking width device (12)
For receiving the 4th subtractor G4 output electrical network positive sequence voltage beta -axis component vgβ1；
The first input end of first coordinate converter (13) is connected to the first output that first lock mutually locks width device (12)
End, the second input of first coordinate converter (13) is connected to the second output that first lock mutually locks width device (12)
End；
The input of the CLARKE changers (11) as the isochronous controller (1) the 5th input and receive the electricity
Net voltage vgabc；
It is described second lock mutually lock width device (14) first input end as the isochronous controller (1) the 3rd input and receive
Negative sequence voltage d axle reference valuesSecond lock mutually locks the second input of width device (14) as the isochronous controller (1)
The 4th input and receive negative sequence voltage q axle reference valuesThe 3rd input that second lock mutually locks width device (14) is used for
Receive the first subtractor G1 output electrical network negative phase-sequence voltage α axle component vgα2, described second locks the 4th input for mutually locking width device (14)
For receiving the second subtractor G2 output electrical network negative phase-sequence voltage beta -axis component vgβ2；
The first input end of second coordinate converter (15) is connected to the first output that second lock mutually locks width device (14)
End, the second input of second coordinate converter (15) is connected to the second output that second lock mutually locks width device (14)
End；
The first input end of first feedforward computer (16) is connected to the first input that first lock mutually locks width device (12)
Hold and receive positive sequence voltage d axle reference valuesSecond input of first feedforward computer (16) is connected to described first
Lock mutually locks the second input of width device (12) and receives positive sequence voltage q axle reference valuesFirst feedforward computer (16)
3rd input is connected to the second outfan positive sequence voltage phase theta that first lock mutually locks width device (12)+；
The first input end of second feedforward computer (17) is connected to the first input that second lock mutually locks width device (14)
End, the second input of second feedforward computer (17) is connected to the second input that second lock mutually locks width device (14)
End, the 3rd input of second feedforward computer (17) is connected to the second output that second lock mutually locks width device (14)
End；
The first input end of the first adder G1 is connected to the first outfan of the CLARKE changers (11), and described
Second input of one adder G1 is connected to the first outfan of first coordinate converter (13), the first adder
3rd input of G1 is connected to the first outfan of first feedforward computer (16)；The output of the first adder G1
End is connected to the 3rd input that second lock mutually locks width device (14)；
The first input end of the second adder G2 is connected to the second outfan of the CLARKE changers (11), and described
Second input of two adders G2 is connected to the second outfan of first coordinate converter (13), the second adder
3rd input of G2 is connected to the second outfan of first feedforward computer (16), the output of the second adder G2
End is connected to the 4th input that second lock mutually locks width device (14)；
The first input end of the 3rd adder G3 is connected to the first outfan of second coordinate converter (15), described
Second input of the 3rd adder G3 is connected to the first outfan of CLARKE changers (11), the 3rd adder G3
3rd input is connected to the first outfan of the second feedforward computer (17), and the outfan of the 3rd adder G3 is connected to
First lock mutually locks the 3rd input of width device (12)；
The 4th adder G4 first input end is connected to the second outfan of second coordinate converter (15), and second is defeated
Enter the second outfan that end is connected to the CLARKE changers (11), the 3rd input is connected to the second feedforward computer
(17) the second outfan, outfan is connected to the 4th input that first lock mutually locks width device (12)；
The first input end of fifth adder G5 is connected to the first outfan of first coordinate converter (13), and second
Input is connected to the first outfan of second coordinate converter (15)；
The first input end of the 6th adder G6 is connected to the second outfan of first coordinate converter (13), and second
Input is connected to the second outfan of the second coordinate converter (15)；
The first input end of the PWM generator (18) is connected to the outfan of fifth adder G5, and the PWM is adjusted
Second input of generator (18) processed is connected to the outfan of the 6th adder G6, the PWM generator (18)
The 3rd input receive the DC bus-bar voltage V as the 6th input of isochronous controller (1)dc；The PWM is sent out
The outfan of raw device (18) is used for output drive signal S as the outfan of isochronous controller (1)abc。
2. virtual synchronous control system as claimed in claim 1, it is characterised in that the first lock mutually locks width device (12) including first
PARK changers (121), first integrator (122), second integral device (123), the first proportionality coefficient generator (124), the 3rd
Integrator (125), the 4th integrator (126), the second proportionality coefficient generator (127), the 7th subtractor G7, the 8th adder G8
With the 9th adder G9；
First PARK changers (121) first input end is used for the first lock and is mutually locking the input signal electrical network of width device (12) first just
Sequence voltage α axle component vgα1, the second input is used to receiving the first lock mutually locks the input signal electrical network positive sequence voltage of width device (12) second
Beta -axis component vgβ1, the 3rd input is for the 9th adder G9 outfan θ of reception+；
First integrator (122) input is connected to a PARK and converts (121) second outfans；
Second integral device (123) input is connected to the first integrator (122)；
First proportionality coefficient generator (124) input is connected to the first integrator (122) outfan；
Third integral device (125) input is connected to the outfan of the 7th subtractor G7；
4th integrator (126) input is connected to the outfan of the third integral device (125)；
Second proportionality coefficient generator (127) input is connected to third integral device (125) outfan；
The 7th subtractor G7 first input ends are connected to the first outfan of a PARK changers, the 7th subtraction
The inputs of device G7 second are connected to the 8th adder G8 outfan, and the 7th subtractor G7 outfans are connected to described
The input of three integrators (125)；
The 8th adder G8 first input end is connected to the outfan of the 4th integrator (126), the 8th addition
The inputs of device G8 second are connected to the outfan of the second proportionality coefficient generator (127), the 8th adder G8 it is defeated
Go out the second input that end is connected to the 7th subtractor G7, the outfan θ of the 8th adder G8+Width is mutually locked as the first lock
The outfan of device (12) first；
The first input end of the 9th adder G9 is connected to the outfan of the second integral device (123), and the described 9th adds
Second input of musical instruments used in a Buddhist or Taoist mass G9 is connected to the outfan of the first proportionality coefficient generator (124), the 9th adder G9
Outfan be connected to the input of a PARK changers (121) the 3rd, the output terminals A of the 8th adder G8+As
One lock mutually locks the outfan of width device (12) second.
3. virtual synchronous control system as claimed in claim 1 or 2, it is characterised in that the second lock mutually locks width device (14) to be included
2nd PARK changers (141), the 5th integrator (142), the 6th integrator (143), the 3rd proportionality coefficient generator (144),
7th integrator (145), the 8th integrator (146), the 4th proportionality coefficient generator (147), the tenth adder G10, the 11st
Adder G11 and the 12nd adder G12；
2nd PARK changers (141) first input end is used for the second lock, and mutually the input signal electrical network of lock width device (14) first is born
Sequence voltage α axle component vgα2, the second input is used to receiving the second lock mutually locks the input signal electrical network positive sequence voltage of width device (14) second
Beta -axis component vgβ2, the 3rd input is connected to the 9th adder G12 outfan θ-；
5th integrator (142) input is connected to the 2nd PARK and converts (141) second outfans；
6th integrator (143) input is connected to the 5th integrator (142)；
3rd proportionality coefficient generator (144) input is connected to the 5th integrator (142) outfan；
7th integrator (145) input is connected to the outfan of the 7th subtractor G10；
8th integrator (146) input is connected to the outfan of the 7th integrator (145)；
4th proportionality coefficient generator (147) input is connected to the 7th integrator (145) outfan；
The tenth subtractor G10 first input ends are connected to the outfan of the 2nd PARK changers (141) first, and described
Ten the second inputs of subtractor G10 are connected to the 11st adder G11 outfan, the tenth subtractor G10 outfans
It is connected to the input of the 7th integrator (145)；
The 12nd adder G12 first input end is connected to the outfan of the 6th integrator (143), and the described 12nd
The input of adder G12 second is connected to the outfan of the 3rd proportionality coefficient generator (144), the 12nd adder
The outfan of G12 is connected to second input of the tenth subtractor G10, the outfan θ of the 12nd adder G12-As
First lock mutually locks the outfan of width device (14) first；
The first input end of the 11st adder G11 is connected to the outfan of the 8th integrator (146), and the described tenth
Second input of one adder G11 is connected to the outfan of the 4th proportionality coefficient generator (147), and the described 11st adds
The outfan of musical instruments used in a Buddhist or Taoist mass G11 is connected to the input of a PARK changers (141) the 3rd, the output of the 11st adder G11
End A+The outfan of width device (14) second is mutually locked as the second lock.
4. virtual synchronous control system as claimed in claim 1 or 2, it is characterised in that first feedforward computer (16)
Including the first cosine function generator (161), the first Sine Function Generator (162), the first multiplier (163), the second multiplication
Device (164), the 3rd multiplier (165), the 4th multiplier (166), the 13rd adder G13 and the 14th adder G14；
First cosine function generator (161) input is used to receive the 3rd input of first feedforward computer (16)
Signal positive sequence voltage phase theta+；
First Sine Function Generator (162) input is used to receive the 3rd input of first feedforward computer (16)
Signal positive sequence voltage phase theta+；
First multiplier (163) first input end is used to receive the first input signal of first feedforward computer (16)
Positive sequence voltage d axle reference valuesThe input of first multiplier (163) second is connected to first cosine function to be occurred
The outfan of device (161)；
Second multiplier (164) first input end is used to receive the second input signal of first feedforward computer (16)
Positive sequence voltage q axle reference valuesThe input of second multiplier (164) second is connected to first SIN function to be occurred
The outfan of device (162)；
3rd multiplier (165) first input end is used to receive the second input signal of first feedforward computer (16)
Positive sequence voltage q axle reference valuesThe input of 3rd multiplier (165) second is connected to first cosine function to be occurred
The outfan of device (161)
4th multiplier (166) first input end is used to receive the first input signal of first feedforward computer (16)
Positive sequence voltage d axle reference valuesThe input of 4th multiplier (166) second is connected to first SIN function to be occurred
The outfan of device (162)；
The 13rd subtractor G13 first input ends are connected to the first multiplier (163) outfan, and the described 13rd subtracts
The inputs of musical instruments used in a Buddhist or Taoist mass G13 second are connected to the second multiplier (164) outfan, and the 13rd subtractor G13 outfans are made
For the first outfan of the described first feedforward computer (16)
The 14th adder G14 first input end is connected to the 3rd multiplier (165) outfan, and the described 14th adds
The inputs of musical instruments used in a Buddhist or Taoist mass G14 second are connected to the 4th multiplier (166) outfan, and the 14th adder G14 outfan is made
For the second outfan of the described first feedforward computer (16)
5. virtual synchronous control system as claimed in claim 1, it is characterised in that second feedforward computer (17) includes
Second cosine function generator (161), the second Sine Function Generator (162), the 5th multiplier (163), the 6th multiplier
(164), the 7th multiplier (165), the 8th multiplier (166), the 15th adder G13 and the 16th adder G14；
Second cosine function generator (171) input is used to receive the 3rd input of second feedforward computer (17)
Signal negative sequence voltage phase theta-；
Second Sine Function Generator (172) input is used to receive the 3rd input of second feedforward computer (17)
Signal negative sequence voltage phase theta-；
5th multiplier (173) first input end is used to receive the first input signal of second feedforward computer (17)
Negative sequence voltage d axle reference valuesThe input of 5th multiplier (173) second is connected to second cosine function to be occurred
The outfan of device (171)；
6th multiplier (174) first input end is used to receive the second input signal of second feedforward computer (17)
Negative sequence voltage q axle reference valuesThe input of 6th multiplier (174) second is connected to second SIN function to be occurred
The outfan of device (172)；
7th multiplier (175) first input end is used to receive the second input signal of second feedforward computer (17)
Negative sequence voltage q axle reference valuesThe input of 7th multiplier (175) second is connected to second cosine function to be occurred
The outfan of device (171)
8th multiplier (176) first input end is used to receive the first input signal of second feedforward computer (17)
Negative sequence voltage d axle reference valuesThe input of 8th multiplier (176) second is connected to second SIN function to be occurred
The outfan of device (172)；
The 15th subtractor G15 first input ends are connected to the 5th multiplier (173) outfan, and the described 15th subtracts
The inputs of musical instruments used in a Buddhist or Taoist mass G15 second are connected to the 6th multiplier (174) outfan, and the 15th subtractor G15 outfans are made
For the first outfan of the described second feedforward computer (17)
The 16th adder G16 first input end is connected to the 7th multiplier (175) outfan, and the described 16th adds
The inputs of musical instruments used in a Buddhist or Taoist mass G16 second are connected to the 8th multiplier (176) outfan, and the 16th adder G16 outfan is made
For the second outfan of the described first feedforward computer (17)
6. the virtual synchronous control method of the asymmetric lower current transformer of a kind of line voltage, it is characterised in that comprise the steps：
S1：Collection line voltage vgabc, power network current igabcWith DC bus-bar voltage Vdc；
S2：To the line voltage vgabcCLARKE conversion is carried out, α axle line voltage v are obtainedgαWith β axle line voltage vgβ；To institute
State power network current igabcCLARKE conversion is carried out, α axle power network current i are obtainedgαWith β axle power network current component igβ；And according to the α
Axle line voltage vgα, β axle line voltage vgβ, the α axles power network current igαWith the β axles power network current igβObtain instantaneous active
Power P and instantaneous reactive power Q；
S3：According to the instantaneous active power P, the instantaneous reactive power Q, current transformer active power reference value PrefAnd change
Reactive power reference qref Q of stream devicerefObtain positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesWith negative sequence voltage d
Axle reference valueNegative sequence voltage q axle reference values
S4：According to the line voltage vgabc, the positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesIt is described
Negative sequence voltage d axle reference valuesNegative sequence voltage q axle reference valuesWith the DC bus-bar voltage VdcObtain drive signal Sabc,
And drive the current transformer with realize line voltage it is asymmetric under Synchronization Control；
Step S4 is specially：
S41：By α axle line voltage vgαWith α axle negative phase-sequence control voltagesAnd α axle negative phase-sequence feed-forward voltagesDiffer from, obtaining electrical network just
Sequence voltage α axle component vgα1；By β axle line voltage vgβWith β axle negative phase-sequence control voltagesAnd β axle negative phase-sequence feed-forward voltagesDiffer from,
Obtain electrical network positive sequence voltage beta -axis component vgβ1；
S42：By the electrical network positive sequence voltage α axle component vgα1, the electrical network positive sequence voltage beta -axis component vgβ1And the positive sequence voltage
D axle reference valuesThe positive sequence voltage q axle reference valuesWidth is mutually locked through lock to process, obtain positive sequence control voltage amplitude A+With
Phase theta+；
S43：By positive sequence control voltage amplitude A+And phase theta+, through the conversion of polar coordinate to rectangular coordinate, obtain the control of α axles positive sequence
Voltageβ axle positive sequence control voltages
S44：By α axle line voltage vgαWith α axle positive sequence control voltagesAnd α axle positive sequence feed-forward voltagesDiffer from, obtain electrical network negative phase-sequence
Voltage α axle component vgα2；By β axle line voltage vgβWith β axle positive sequence control voltagesAnd β axle positive sequence feed-forward voltagesDiffer from, obtain
Electrical network negative phase-sequence voltage beta -axis component vgβ2；
S45：By electrical network negative phase-sequence voltage α axle component vgα2, electrical network negative phase-sequence voltage beta -axis component vgβ2And negative sequence voltage d axle reference values
Negative sequence voltage q axle reference valuesJing locks are mutually locked width and are processed, and obtain negative phase-sequence control voltage amplitude A-And phase theta-；
S46：By negative phase-sequence control voltage amplitude A-And phase theta-Through the conversion of polar coordinate to rectangular coordinate, α axles negative phase-sequence control electricity is obtained
Pressureβ axle negative phase-sequence control voltages
S47：According to the positive sequence voltage d axle reference valuesPositive sequence voltage q axle reference valuesWith positive sequence control voltage phase theta+,
Calculate the feedforward of α axles positive sequenceβ axles positive sequence feedoversAccording to the negative sequence voltage d axle reference valuesNegative sequence voltage q axles are referred to
ValueWith negative phase-sequence control voltage phase theta-, calculate the feedforward of α axles negative phase-sequenceβ axles negative phase-sequence feedovers
S48：By α axle positive sequence control voltagesWith α axle negative phase-sequence control voltagesSummation, obtains α axle control voltages vcα；By β axle positive sequences
Control voltageWith β axle negative phase-sequence control voltagesSummation, obtains β axle control voltages vcβ；
S49：By α axle control voltages vcα, β axle control voltages vcβWith DC bus-bar voltage VdcObtain Jing after PWM for driving
Switching signal S of current transformerabc。
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| CN105119309B (en) * | 2015-09-28 | 2017-08-01 | 国家电网公司 | Suitable for the synchronous inverter control system under unbalanced power supply operating mode |
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| HUP1600231A2 (en) * | 2016-04-05 | 2017-12-28 | Robert Gyoergy | Circuit arrangement and equipment for parallel leadwire load distribution in ac systems |
| CN106208054B (en) * | 2016-09-22 | 2018-08-28 | 湘潭大学 | Inhibit the device and method of synchronous inverter negative-sequence current under the conditions of unbalanced power supply |
| CN106787871B (en) * | 2016-12-05 | 2019-02-05 | 华中科技大学 | A kind of LC code converter of multivariable feedback controller |
| CN107196302A (en) * | 2017-07-19 | 2017-09-22 | 南方电网科学研究院有限责任公司 | A kind of MMC current harmonics elimination control method, system and controller |
| CN109830988B (en) * | 2019-02-22 | 2020-11-24 | 山东大学 | Virtual synchronization control method and system for V2G system |
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| CN103346583A (en) * | 2013-04-15 | 2013-10-09 | 湖南大学 | Fixed-frequency direct-power PWM converter controlling method having rapid power response capability |
| CN103457287A (en) * | 2013-05-17 | 2013-12-18 | 湖南大学 | Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant |
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| CN103346583A (en) * | 2013-04-15 | 2013-10-09 | 湖南大学 | Fixed-frequency direct-power PWM converter controlling method having rapid power response capability |
| CN103457287A (en) * | 2013-05-17 | 2013-12-18 | 湖南大学 | Multi-terminal VSC-HVDC grid-connected transmission system controlling method applied to wind power plant |
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| 永磁直驱风力发电机组全功率变流器控制策略的研究;项丹;《万方学位论文》;20131031;文章第1-66页 * |
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