CN108233381A - A kind of solid-state transformer, control method and device - Google Patents
A kind of solid-state transformer, control method and device Download PDFInfo
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- CN108233381A CN108233381A CN201611161288.6A CN201611161288A CN108233381A CN 108233381 A CN108233381 A CN 108233381A CN 201611161288 A CN201611161288 A CN 201611161288A CN 108233381 A CN108233381 A CN 108233381A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/10—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 without intermediate conversion into dc by static converters using transformers
-
- 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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/22—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/293—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 without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The present invention discloses a kind of solid-state transformer, control method and device.Wherein, the solid-state transformer includes：Two three-phase single-phase matrix convertors and a high frequency transformer, two three-phase single-phase matrix convertors are of coupled connections, and be arranged symmetrically about high frequency transformer by high frequency transformer；Each three-phase single-phase matrix convertor includes six bridge arm of three-phase, and two bridge arms up and down per phase are in parallel, and each bridge arm is in series by two opposite insulated-gate bipolar transistor devices of current direction；Source net side power grid and load-side power grid being often connected by filter inductance and three-phase single-phase matrix convertor respectively, being often in parallel for three-phase single-phase matrix convertor being connected with source net side power grid has filter capacitor.The control method and device are used to control solid-state transformer.Solid-state transformer provided by the invention, control method and device realize the Power Exchange control between power grid and power flow direction control.
Description
Technical field
The present invention relates to T ＆ D Technology fields, and in particular to a kind of solid-state transformer, control method and device.
Background technology
In recent years since the rapid development of power electronic devices is so that Power Electronic Technique being applied in electric system
To be possible, proposed solid-state transformer (Solid State Transformer, hereinafter referred to as SST) is relative to tradition in recent years
It is a kind of emerging technology for passive transformer.
Traditional passive transformer lacks controllability due to the presence of passive electromagnetic original paper, it is therefore desirable to some power electronics
Device, such as flexible AC transmitting system rises sharply solving voltage dip, reactive-load compensation, frequency fluctuation power quality problem.It is existing
There is technology to carry out the energy exchange between two power grids using traditional passive transformer, directly transformer cannot be controlled,
It need to carry out the control of voltage and frequency respectively by power converter primary, secondary side to transformer, realize corresponding function,
And power is one-way flow, i.e., electric energy is to be transferred to secondary side from primary side or be transferred to primary side by secondary side.
Therefore, a kind of solid-state transformer and its control method how to be proposed, can be realized to two different brackets power grids
Power control and to and fro flow of power become industry important topic urgently to be resolved hurrily.
Invention content
For the defects in the prior art, the present invention provides a kind of solid-state transformer, control method and device.
On the one hand, the present invention proposes a kind of solid-state transformer, including：
Two Three-phase-single-phase matrix converters and a high frequency transformer, described two Three-phase-single-phase matrix converters lead to
It crosses the high frequency transformer to be of coupled connections, and is symmetrical arranged about the high frequency transformer；
Each Three-phase-single-phase matrix converter includes six bridge arm of three-phase, and two bridge arms up and down per phase are in parallel, each bridge arm by
Two opposite insulated-gate bipolar transistor devices of current direction are in series；
Source net side power grid and load-side power grid pass through filter inductance and Three-phase-single-phase matrix converter respectively
Often it is connected, being often in parallel for the Three-phase-single-phase matrix converter being connected with the source net side power grid has filter capacitor.
On the other hand, the present invention provides a kind of method for controlling above-described embodiment solid-state transformer, the method packet
It includes：
Obtain the electric current and voltage of load-side power grid；
Fixed phase angle is obtained by phaselocked loop according to the voltage；
According to the electric current and the fixed phase angle, the electric current is obtained under dq coordinates by ABC-dq coordinate transforms
Electric current direct-axis component and electric current quadrature axis component；
According to the voltage and the fixed phase angle, the voltage is obtained under dq coordinates by ABC-dq coordinate transforms
Voltage direct-axis component, and according to the voltage direct-axis component and predetermined power, obtain electric current d-axis reference value, and electric current is handed over
Axis reference value is set as 0；Wherein, if the predetermined power is positive value, power forward flow, otherwise power reverse flow；
The difference of the electric current direct-axis component and electric current quadrature axis reference are subtracted according to the electric current d-axis reference value
Value subtracts the difference of the electric current quadrature axis component, obtains electric current d-axis output valve by pi regulator respectively and electric current quadrature axis exports
Value；
The electric current d-axis output valve and electric current quadrature axis output valve are subjected to dq-ABC coordinate transforms, obtain three phase sine tune
Wave processed, and the three phase sine modulating wave is subjected to space vector impulse modulation, switching tube drive signal is obtained to control insulation
Grid bipolar transistor device acts.
In another aspect, the present invention provides a kind of control device of solid-state transformer, which is characterized in that including：
Acquiring unit, for obtaining the electric current of load-side power grid and voltage；
First computing unit, for obtaining fixed phase angle by phaselocked loop according to the voltage；
First coordinate transformation unit, for according to the electric current and the fixed phase angle, passing through ABC-dq coordinate transforms
Obtain electric current direct-axis component and electric current quadrature axis component of the electric current under dq coordinates；
Second coordinate transformation unit, for according to the voltage and the fixed phase angle, passing through ABC-dq coordinate transforms
Voltage direct-axis component of the voltage under dq coordinates is obtained, and according to the voltage direct-axis component and reference power, obtains electricity
D-axis reference value is flowed, and electric current quadrature axis reference value is set as 0；Wherein, if the predetermined power is positive value, power forward stream
It moves, otherwise power reverse flow；
Second computing unit, for subtracting the difference of the electric current direct-axis component according to the electric current d-axis reference value, with
And the electric current quadrature axis reference value subtracts the difference of the electric current quadrature axis component, it is defeated to obtain electric current d-axis by pi regulator respectively
Go out value and electric current quadrature axis output valve；
Modulation unit, for the electric current d-axis output valve and electric current quadrature axis output valve to be carried out dq-ABC coordinate transforms,
Three phase sine modulating wave is obtained, and the three phase sine modulating wave is subjected to space vector impulse modulation, obtains switching tube driving
Signal is to control insulated-gate bipolar transistor device to act.
Solid-state transformer provided by the invention, control method and device, different power grids is connected by solid-state transformer, right
Solid-state transformer uses output current closed-loop control, can realize the Power Exchange control between power grid and power flow direction control,
The quality of electric energy can be improved.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, 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 this hair
Some bright embodiments, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of solid-state transformer of the embodiment of the present invention；
Fig. 2 is the flow diagram of the control method of solid-state transformer of the embodiment of the present invention；
Fig. 3 is the structure diagram of the control device of solid-state transformer of the embodiment of the present invention；
Fig. 4 a- Fig. 4 e are simulation results of the MC-SST of the embodiment of the present invention when predetermined power is 10kW；
Fig. 5 a- Fig. 5 c are simulation results of the MC-SST of the embodiment of the present invention when predetermined power is -15kW；
Fig. 6 a are the first side voltage v of high frequency transformerpSimulation result；
Fig. 6 b are high frequency transformer secondary side voltage vsSimulation result；
Reference sign：
1- sources net side power grid；2- load-side power grids；
3- filter inductances；4- filter capacitors；
5- bridge arms；6- Three-phase-single-phase matrix converters；
7- high frequency transformers.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, is explicitly described the technical solution in the embodiment of the present invention, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
All other embodiments obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Fig. 1 is the structure diagram of solid-state transformer of the embodiment of the present invention, as shown in Figure 1, provided in an embodiment of the present invention
Solid-state transformer (Solid State Transformer, hereinafter referred to as SST) is including two Three-phase-single-phase matrix converters 6
(Matrix Converter, a hereinafter referred to as MC) and high frequency transformer 7, two Three-phase-single-phase matrix converters 6 pass through height
Frequency power transformer 7 is of coupled connections, and is symmetrical arranged about high frequency transformer 7；Each Three-phase-single-phase matrix converter 6 includes three
Six bridge arm of phase, two bridge arm up and down 5 per phase is in parallel, and each bridge arm 5 is by the opposite insulated gate bipolar crystal of two current directions
It manages (Insulated-gate-bipolar transistor, hereinafter referred to as IGBT) devices in series to form, IGBT is used for control bridge
The connection and disconnection of arm 5；Source net side power grid 1 per being mutually connected with a filter inductance 3, each filter inductance 3 and a three-phase-
Single-phase matrix convertor 6 is often connected, and load-side power grid 2 is connected per phase with a filter inductance 3, each filter inductance 3
With being often connected for Three-phase-single-phase matrix converter 6, the Three-phase-single-phase matrix converter 6 being connected with source net side power grid 1
Be often in parallel and have filter capacitor 4, filter inductance 3 is used to reducing the harmonic wave ripple in circuit, and filter capacitor 4 is for preventing the change of current
When the impact to power grid of the burr that generates.Solid-state transformer provided by the invention hereinafter referred to as MC-SST.
The course of work of the MC-SST is illustrated below.Under powered operation pattern, it is connected with source net side power grid 1
Three-phase-single-phase matrix converter 6 netted from source and obtain electric energy, run with current source type rectifier, it is female then to pass through virtual direct current
Line is converted to the first side that high-frequency ac voltage is transported to high frequency transformer 7, and high frequency transformer 7 hands over the high frequency of first side
Galvanic electricity pressure is through n：1 decompression is coupled to secondary side, no-load voltage ratios of the n for transformer, the three-phase being connected with load-side power grid 2-single-phase matrix
The high-frequency ac voltage being depressured after coupling is reverted to virtual dc bus by converter 6, is then run with voltage source inverter, will
Electric energy is transferred to load-side power grid 2.
Under reverse active mode, the Three-phase-single-phase matrix converter 6 that is connected with load-side power grid 2 is from load-side power grid 2
Electric energy is obtained, is run with current source type rectifier, high-frequency ac voltage is then converted to by virtual dc bus and is transported to height
The secondary side of frequency power transformer 7, high frequency transformer 7 is by the high-frequency ac voltage of secondary side through 1：N boostings are coupled to first side,
The high-frequency ac voltage after coupling that will boost with the Three-phase-single-phase matrix converter 6 that source net side power grid 1 is connected reverts to virtual straight
Busbar is flowed, is then run with voltage source inverter, electric energy is transferred to source net side power grid 1.
The no-load voltage ratio n of transformer can be calculated by equation below and be obtained.
Usm=1.5nmI·mV·Vom
Wherein, UsmFor the fundamental voltage amplitude of source net side power grid 1, VomFor the fundamental voltage amplitude of load-side power grid 2, mIIt is
The ratio between the amplitude of the input current fundametal compoment of source net side power grid 1 and the first side current average of high frequency transformer 7, mVIt is negative
Carry the ratio between the amplitude of the fundamental voltage output of voltage component of side power grid 2 and the secondary side average voltage of high frequency transformer 7.
Solid-state transformer provided by the invention can connect different power grids, by electric using output to solid-state transformer
Closed-loop control is flowed, can realize the Power Exchange control between power grid and power flow direction control, the quality of electric energy can be improved.
The MC-SST is when between different brackets power grid, the voltage of the source net side power grid or the load-side power grid
A large amount of harmonic waves can be generated by carrying out energy exchange in frequency and asynchronous phase with electric current, be unfavorable for the normal fortune of equipment in power grid
Row, while energy loss is larger, is also possible to that equipment can be damaged in inversion.Therefore it needs through certain control method to described
Single-stage two-way formula solid-state transformer is controlled, to realize the frequency and Phase synchronization of the electric current of the source net side power grid and voltage
And the electric current of load-side and the frequency of voltage and Phase synchronization.
Fig. 2 is the flow diagram of the control method of solid-state transformer of the embodiment of the present invention, as shown in Fig. 2, the present invention carries
What is supplied includes for the method that controls above-described embodiment solid-state transformer：
S201, the electric current and voltage for obtaining load-side power grid；
Specifically, the control device of solid-state transformer periodically samples the electric current and voltage of load-side power grid,
Sampling period is far smaller than the primitive period of the load-side power grid, such as the load-side power grid primitive period is 0.02 second, sampling
Period can be 0.2 millisecond.
S202, fixed phase angle is obtained by phaselocked loop according to the voltage；
Specifically, the control device of the solid-state transformer is obtained through phaselocked loop with reference to phase according to the voltage got
Parallactic angle, the fixed phase angle is as subsequent voltage and the phase reference of electric current ABC-dq coordinate transforms, to ensure the voltage
ABC-dq coordinate transforms with the electric current carry out under identical phase angle.
S203, according to the electric current and the fixed phase angle, the electric current is obtained in dq by ABC-dq coordinate transforms
Electric current direct-axis component and electric current quadrature axis component under coordinate；
Specifically, the control device of the solid-state transformer by the electric current got using the fixed phase angle as phase
Position benchmark carries out ABC-dq coordinate transforms, obtains electric current direct-axis component and electric current quadrature axis component, the electric current direct-axis component reaction
Active current, the electric current quadrature axis component react reactive current component.
The electric current direct-axis component IdfIt can be calculated and obtained by equation below：
Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCsin(θ+2π/3)]
The electric current direct-axis component IqfIt can be calculated and obtained by equation below：
Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCcos(θ+2π/3)]
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
S204, according to the voltage and the fixed phase angle, the voltage is obtained in dq by ABC-dq coordinate transforms
Voltage direct-axis component under coordinate, and according to the voltage direct-axis component and predetermined power, electric current d-axis reference value is obtained, and will
Electric current quadrature axis reference value is set as 0；Wherein, if the predetermined power is positive value, power forward flow, otherwise power reverse flow
It is dynamic；
Specifically, the control device of the solid-state transformer by the voltage got using the fixed phase angle as phase
Position benchmark carries out ABC-dq coordinate transforms, obtains voltage direct-axis component, and according to the voltage direct-axis component and predetermined power meter
It calculates and obtains electric current d-axis reference value, and electric current quadrature axis reference value is set as 0.The predetermined power shows MC- if it is positive value
SST is under powered operation pattern, and power forward flow, i.e. electric energy are passed from the source net side power grid to the load-side power grid
It is defeated；The predetermined power shows that MC-SST is under reverse active mode if it is negative value, power reverse flow, i.e. electric energy from
The load-side power grid is to the source net side electrical grid transmission.It can be realized to source net side power grid and load by the predetermined power
The control of the size and flow direction of power is transmitted between the power grid of side.
The voltage direct-axis component VdIt can be calculated and obtained by equation below：
Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCsin(θ+2π/3)]
Wherein, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle.
The electric current d-axis reference value IdrIt can be calculated and obtained by equation below：
Idr=(2/3) P/Vd, wherein, P is the predetermined power.
S205, the difference that the electric current direct-axis component is subtracted according to the electric current d-axis reference value and the electric current are handed over
Axis reference value subtracts the difference of the electric current quadrature axis component, obtains electric current d-axis output valve by pi regulator respectively and electric current is handed over
Axis output valve；
Specifically, the electric current d-axis reference value is subtracted the electric current d-axis point by the control device of the solid-state transformer
Input of the difference of amount as pi regulator d axis, using electric current quadrature axis reference value subtract the difference of the electric current quadrature axis component as
The input of pi regulator q axis, pi regulator can export by adjusting electric current d-axis output valve and electric current quadrature axis output valve, to subtract
Few above-mentioned difference, realizes the tracking to the electric current.
S206, the electric current d-axis output valve and electric current quadrature axis output valve are subjected to dq-ABC coordinate transforms, obtain three-phase
Sinusoidal modulation wave, and the three phase sine modulating wave is subjected to space vector impulse modulation, switching tube drive signal is obtained to control
Insulated-gate bipolar transistor device action processed.
Specifically, the control device of the solid-state transformer by the electric current d-axis output valve and electric current quadrature axis output valve into
Row dq-ABC coordinate transforms obtain sinusoidal three-phase modulations wave, and space vector pulse duration is carried out to the sinusoidal three-phase modulations wave
Modulation obtains the switching tube drive signal controlled MC-SST, further according to the switching tube drive signal to the insulated gate of MC
The control that bipolar transistor device is connected and disconnected, so as to control the frequency of the electric current of the source net side power grid and voltage
With the frequency and Phase synchronization of the electric current and voltage of Phase synchronization and load-side.
The control method of solid-state transformer provided by the invention, by being used to the solid-state transformer for connecting different power grids
Output current closed-loop control can realize the Power Exchange control between power grid and power flow direction control, can improve electric energy
Quality.
It is further, described according to the electric current and the fixed phase angle on the basis of above-described embodiment, pass through
ABC-dq coordinate transforms obtain electric current direct-axis component and electric current quadrature axis component of the electric current under dq coordinates and include：
According to Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCSin (+2 π/3 of θ)], calculate the electric current direct-axis component
Idf；
According to Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCCos (+2 π/3 of θ)], calculate the electric current direct-axis component
Iqf；
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
It is further, described according to the voltage and the fixed phase angle on the basis of the various embodiments described above, pass through
ABC-dq coordinate transforms obtain voltage direct-axis component of the voltage under dq coordinates, and according to the voltage direct-axis component and in advance
If power, obtain electric current d-axis reference value and include：
According to Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCSin (+2 π/3 of θ)], calculate the voltage direct-axis component
Vd, wherein, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle；
According to Idr=(2/3) P/Vd, calculate the electric current d-axis reference value Idr, wherein, P is the predetermined power.
Fig. 3 is the structure diagram of the control device of solid-state transformer of the embodiment of the present invention, as shown in figure 3, the present invention carries
The control device of the solid-state transformer of confession include acquiring unit 301, the first computing unit 302, the first coordinate transformation unit 303,
Second coordinate transformation unit 304, the second computing unit 305 and modulation unit 306, wherein：
Acquiring unit 301 is used to obtain the electric current and voltage of load-side power grid；First computing unit 302 is used for according to
Voltage obtains fixed phase angle by phaselocked loop；First coordinate transformation unit 303 be used for according to the electric current and it is described refer to phase
Parallactic angle obtains electric current direct-axis component and electric current quadrature axis component of the electric current under dq coordinates by ABC-dq coordinate transforms；The
Two coordinate transformation units 304 are used for according to the voltage and the fixed phase angle, by described in ABC-dq coordinate transforms acquisition
Voltage direct-axis component of the voltage under dq coordinates, and according to the voltage direct-axis component and reference power, obtain electric current d-axis ginseng
Value is examined, and electric current quadrature axis reference value is set as 0；Wherein, if the predetermined power is positive value, power forward flow, otherwise work(
Rate reverse flow；Second computing unit 305 is used to subtract the difference of the electric current direct-axis component according to the electric current d-axis reference value
Value and the electric current quadrature axis reference value subtract the difference of the electric current quadrature axis component, obtain electric current by pi regulator respectively
D-axis output valve and electric current quadrature axis output valve；Modulation unit 306 is used to export the electric current d-axis output valve and electric current quadrature axis
Value carries out dq-ABC coordinate transforms, obtains three phase sine modulating wave, and the three phase sine modulating wave is carried out space vector arteries and veins
Modulated obtains switching tube drive signal so that insulated-gate bipolar transistor device to be controlled to act.
Specifically, acquiring unit 301 periodically samples the electric current and voltage of load-side power grid, and the sampling period is remote
Much smaller than the primitive period of the load-side power grid, such as the load-side power grid primitive period is 0.02 second, and the sampling period can be
0.2 millisecond.
First computing unit 302 obtains fixed phase angle according to the voltage got through phaselocked loop, described to refer to phase
Parallactic angle is as subsequent voltage and the phase reference of electric current ABC-dq coordinate transforms, to ensure the ABC- of the voltage and the electric current
Dq coordinate transforms carry out under identical phase angle.
First coordinate transformation unit 303 carries out the electric current got by phase reference of the fixed phase angle
ABC-dq coordinate transforms obtain electric current direct-axis component and electric current quadrature axis component, the electric current direct-axis component reaction watt current point
Amount, the electric current quadrature axis component react reactive current component.
The electric current direct-axis component IdfIt can be calculated and obtained by equation below：
Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCsin(θ+2π/3)]
The electric current direct-axis component IqfIt can be calculated and obtained by equation below：
Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCcos(θ+2π/3)]
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
Second coordinate transformation unit 304 carries out the voltage got by phase reference of the fixed phase angle
ABC-dq coordinate transforms obtain voltage direct-axis component, and are calculated according to the voltage direct-axis component and predetermined power and obtain electric current
D-axis reference value, and electric current quadrature axis reference value is set as 0.The predetermined power shows that MC-SST is in power supply if it is positive value
Under operating mode, power forward flow, i.e. electric energy flow to the load-side power grid from the source net side power grid；The predetermined power
If it is negative value, show that MC-SST is under reverse active mode, power reverse flow, i.e. electric energy are from the load-side power grid stream
To the source net side power grid.It can be realized by the predetermined power and transmit power between source net side power grid and load-side power grid
Size and flow direction control.
The voltage direct-axis component VdIt can be calculated and obtained by equation below：
Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCsin(θ+2π/3)]
Wherein, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle.
The electric current d-axis reference value IdrIt can be calculated and obtained by equation below：
Idr=(2/3) P/Vd, wherein, P is the predetermined power.
The electric current d-axis reference value is subtracted the difference of the electric current direct-axis component as PI tune by the second computing unit 305
The input of device d axis is saved, the electric current quadrature axis reference value is subtracted into the difference of the electric current quadrature axis component as pi regulator q axis
Input, pi regulator can export by adjusting electric current d-axis output valve and electric current quadrature axis output valve, real to reduce above-mentioned difference
Now to the tracking of the electric current.
The electric current d-axis output valve and electric current quadrature axis output valve are carried out dq-ABC coordinate transforms by modulation unit 306, are obtained
Sinusoidal three-phase modulations wave is obtained, carrying out space vector pulse width modulation to the sinusoidal three-phase modulations wave obtains to MC-SST progress
The switching tube drive signal of control carries out the insulated-gate bipolar transistor device of MC further according to the switching tube drive signal
Connection and the control disconnected, so as to control the frequency and Phase synchronization and load-side of the electric current of the source net side power grid and voltage
Electric current and voltage frequency and Phase synchronization.
On the basis of above-described embodiment, further, first coordinate transformation unit 303 is specifically used for：
According to Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCSin (+2 π/3 of θ)], calculate the electric current direct-axis component
Idf；
According to Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCCos (+2 π/3 of θ)], calculate the electric current direct-axis component
Iqf；
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
On the basis of the various embodiments described above, further, second coordinate transformation unit 304 is specifically used for：
According to Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCSin (+2 π/3 of θ)], calculate the voltage direct-axis component
Vd, wherein, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle；
According to Idr=(2/3) P/Vd, calculate the electric current d-axis reference value Idr, wherein, P is the predetermined power.
The control device of solid-state transformer provided by the invention, by being used to the solid-state transformer for connecting different power grids
Output current closed-loop control can realize the Power Exchange control between power grid and power flow direction control, can improve electric energy
Quality.
The embodiment of device provided by the invention specifically can be used for performing the process flow of above-mentioned each method embodiment,
Details are not described herein for function, is referred to the detailed description of above method embodiment.
To verify the solid-state transformer proposed by the invention and its control method, the Simulink emulation in MATLAB
The analogue system of MC-SST and control device is established under environment, table 1 is the parameter setting in the analogue system.
1 systematic parameter of table
| Parameter | Setting value |
| High frequency transformer turn ratio, n | 2.45 |
| Load network voltage virtual value | 326V |
| Source net voltage effective value | 1.1kV |
| The fundamental frequency of two power grids, f0 | 50Hz |
| The switching frequency of two matrix converters, fs | 5kHz |
| Source net side filter inductance, Lf | 10mH |
| Source net side wave filter internal resistance, Rf | 5Ω |
| Source net side filter capacitor, Cf | 10μH |
| Load-side filter inductance, Lg | 10mH |
| Load side filter internal resistance, Rg | 0.2Ω |
Respectively to the predetermined power P=10kW in the analogue system, i.e. MC-SST is under powered operation pattern
The course of work and to the predetermined power P=-15kW, i.e. the courses of work of the MC-SST under reverse active mode is imitated
Very.
Fig. 4 a- Fig. 4 c are simulation results of the MC-SST of the embodiment of the present invention when predetermined power is 10kW.Fig. 4 a are represented
The three-phase voltage u of source net side power gridsa、usbAnd uscWaveform, Fig. 4 b represent the three-phase current i of source net side power gridsa、isbAnd isc
Waveform, Fig. 4 c represent the three-phase voltage v of load-side power gridgA、vgBAnd vgCWaveform, Fig. 4 d represent load-side power grid
Three-phase current ioA、ioBAnd ioCWaveform, Fig. 4 e represent the state of load-side active power and reactive power.Such as Fig. 4 a and figure
Shown in 4c, MC-SST realizes the connection of the different source net side power grid of voltage magnitude and load-side power grid.As shown in fig 4e, imitative
During true, active-power P0And reactive power Q0Original state be 0, analogue system start after, by the solid-state transformation
The adjusting of the control device of device, active power reaches the predetermined power 10kW, and reactive power remains zero afterwards after the adjustment, table
Bright unity power factor is grid-connected.
Fig. 5 a- Fig. 5 c are simulation results of the MC-SST of the embodiment of the present invention when predetermined power is -15kW.Fig. 5 a are represented
The three-phase current i of source net side power gridsa、isbAnd iscWaveform, Fig. 5 b represent the three-phase current i of load-side power gridoA、ioBAnd ioC
Waveform, Fig. 5 c represent the state of load-side active power and reactive power.As shown in Figure 5 a, compared with Fig. 4 b, source net side
The electric current of power grid is under powered operation pattern and reverse active mode, and frequency is identical but opposite in phase；As shown in Figure 5 b, with Fig. 4 d
It compares, the electric current of source net side power grid is under powered operation pattern and reverse active mode, and frequency is identical but opposite in phase, it is seen that institute
Stating MC-SST realizes power bi-directional circulation.As shown in Figure 5 b, the current waveform sine degree of load-side power grid is higher, i.e. harmonic wave
It is small, realize the control to power quality.As shown in Figure 5 c, in simulation process, active-power P0And reactive power Q0It is initial
State is 0, after analogue system starts, by the adjusting of the control device of the solid-state transformer, the load-side power grid
Active power reaches the predetermined power -15kW, and power direction when power direction with the predetermined power is 10kw is opposite.
Fig. 6 a are the first side voltage v of high frequency transformerpSimulation result, Fig. 6 b be high frequency transformer secondary side voltage vs's
Simulation result can be seen that by Fig. 6 a and Fig. 6 b through the first side voltage v of virtual DC bus-bar voltagepIt is reduced amplitude 1.5kV weeks
The rectangular wave of 40 μ s of phase, secondary side voltage vsRectangular wave for 40 μ s of amplitude 600V periods.Compare vpWith vsAs it can be seen that vsThere are 20 μ
The ratio between the delay of s, the two amplitude is 2.45.Therefore, MC-SST is working properly.
The apparatus embodiments described above are merely exemplary, wherein the unit illustrated as separating component can
To be or may not be physically separate, the component shown as unit may or may not be physics list
Member, you can be located at a place or can also be distributed in multiple network element.It can be selected according to the actual needs
In some or all of module realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not paying creativeness
Labour in the case of, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It is realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on such understanding, on
Technical solution is stated substantially in other words to embody the part that the prior art contributes in the form of software product, it should
Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including several fingers
It enables and (can be personal computer, server or the network equipment etc.) so that computer equipment is used to perform each implementation
Method described in certain parts of example or embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent replacement to which part technical characteristic；
And these modification or replace, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. a kind of solid-state transformer, which is characterized in that including：
Two Three-phase-single-phase matrix converters and a high frequency transformer, described two Three-phase-single-phase matrix converters pass through institute
It states high frequency transformer to be of coupled connections, and is symmetrical arranged about the high frequency transformer；
Each Three-phase-single-phase matrix converter includes six bridge arm of three-phase, and two bridge arms up and down per phase are in parallel, and each bridge arm is by two
The opposite insulated-gate bipolar transistor device of current direction is in series；
Source net side power grid and load-side power grid pass through every phase of filter inductance and a Three-phase-single-phase matrix converter respectively
Connection, being often in parallel for the Three-phase-single-phase matrix converter being connected with the source net side power grid have filter capacitor.
A kind of 2. method for controlling solid-state transformer as described in claim 1, which is characterized in that the method includes：
Obtain the electric current and voltage of load-side power grid；
Fixed phase angle is obtained by phaselocked loop according to the voltage；
According to the electric current and the fixed phase angle, electricity of the electric current under dq coordinates is obtained by ABC-dq coordinate transforms
Flow direct-axis component and electric current quadrature axis component；
According to the voltage and the fixed phase angle, electricity of the voltage under dq coordinates is obtained by ABC-dq coordinate transforms
Straightening axis component, and according to the voltage direct-axis component and predetermined power, electric current d-axis reference value is obtained, and electric current quadrature axis is joined
It examines value and is set as 0；Wherein, if the predetermined power is positive value, power forward flow, otherwise power reverse flow；
The difference of the electric current direct-axis component is subtracted according to the electric current d-axis reference value and the electric current quadrature axis reference value subtracts
The difference of the electric current quadrature axis component is gone, electric current d-axis output valve and electric current quadrature axis output valve are obtained by pi regulator respectively；
The electric current d-axis output valve and electric current quadrature axis output valve are subjected to dq-ABC coordinate transforms, obtain three phase sine modulation
Wave, and the three phase sine modulating wave is subjected to space vector impulse modulation, switching tube drive signal is obtained to control insulated gate
Bipolar transistor device acts.
3. according to the method described in claim 2, it is characterized in that, described according to the electric current and the fixed phase angle, lead to
Electric current direct-axis component and electric current quadrature axis component of the ABC-dq coordinate transforms acquisition electric current under dq coordinates is crossed to include：
According to Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCSin (+2 π/3 of θ)], calculate the electric current direct-axis component Idf；
According to Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCCos (+2 π/3 of θ)], calculate the electric current direct-axis component Iqf；
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
4. according to the method described in claim 2, it is characterized in that, described according to the voltage and the fixed phase angle, lead to
Cross ABC-dq coordinate transforms and obtain the voltage direct-axis component of the voltage under dq coordinates, and according to the voltage direct-axis component and
Predetermined power obtains electric current d-axis reference value and includes：
According to Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCSin (+2 π/3 of θ)], calculate the voltage direct-axis component Vd,
In, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle；
According to Idr=(2/3) P/Vd, calculate the electric current d-axis reference value Idr, wherein, P is the predetermined power.
5. a kind of control device of solid-state transformer, which is characterized in that including：
Acquiring unit, for obtaining the electric current of load-side power grid and voltage；
First computing unit, for obtaining fixed phase angle by phaselocked loop according to the voltage；
First coordinate transformation unit, for according to the electric current and the fixed phase angle, being obtained by ABC-dq coordinate transforms
Electric current direct-axis component and electric current quadrature axis component of the electric current under dq coordinates；
Second coordinate transformation unit, for according to the voltage and the fixed phase angle, being obtained by ABC-dq coordinate transforms
Voltage direct-axis component of the voltage under dq coordinates, and according to the voltage direct-axis component and reference power, it is straight to obtain electric current
Axis reference value, and electric current quadrature axis reference value is set as 0；Wherein, if the predetermined power is positive value, power forward flow is no
Then power reverse flow；
Second computing unit, for subtracting the difference of the electric current direct-axis component, Yi Jisuo according to the electric current d-axis reference value
The difference that electric current quadrature axis reference value subtracts the electric current quadrature axis component is stated, electric current d-axis output valve is obtained by pi regulator respectively
With electric current quadrature axis output valve；
Modulation unit for the electric current d-axis output valve and electric current quadrature axis output valve to be carried out dq-ABC coordinate transforms, obtains
Three phase sine modulating wave, and the three phase sine modulating wave is subjected to space vector impulse modulation, obtain switching tube drive signal
Insulated-gate bipolar transistor device to be controlled to act.
6. control device according to claim 5, which is characterized in that first coordinate transformation unit is specifically used for：
According to Idf=2/3 [ioAsinθ+ioBsin(θ-2π/3)+ioCSin (+2 π/3 of θ)], calculate the electric current direct-axis component Idf；
According to Iqf=2/3 [ioAcosθ+ioBcos(θ-2π/3)+ioCCos (+2 π/3 of θ)], calculate the electric current direct-axis component Iqf；
Wherein, ioA、ioBAnd ioCThe three-phase current of the load-side power grid is represented respectively, and θ is the fixed phase angle.
7. control device according to claim 5, which is characterized in that second coordinate transformation unit is specifically used for：
According to Vd=2/3 [VgAsinθ+VgBsin(θ-2π/3)+VgCSin (+2 π/3 of θ)], calculate the voltage direct-axis component Vd,
In, VgA、VgBAnd VgCThe three-phase voltage of the load-side power grid is represented respectively, and θ is the fixed phase angle；
According to Idr=(2/3) P/Vd, calculate the electric current d-axis reference value Idr, wherein, P is the predetermined power.
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