CN109617426A - A kind of electric power electric transformer circuit, electric power electric transformer and control method - Google Patents
A kind of electric power electric transformer circuit, electric power electric transformer and control method Download PDFInfo
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- CN109617426A CN109617426A CN201811557395.XA CN201811557395A CN109617426A CN 109617426 A CN109617426 A CN 109617426A CN 201811557395 A CN201811557395 A CN 201811557395A CN 109617426 A CN109617426 A CN 109617426A
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- power
- bridge module
- instruction
- controller
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
Abstract
The invention discloses a kind of electric power electric transformer circuits, the control method of electric power electric transformer and electric power electric transformer, in the cascaded H-bridges being connect with three-phase AC grid, inversion H bridge and multiwinding transformer is set between the rectification H bridge of the input terminal of DC grid, the H bridge module connection that the input terminal of multiwinding transformer is connect out with from three-phase AC grid respectively, the input power of each H bridge module includes DC component and secondary flutter component, secondary pulsating power is in three-phase symmetrical, the rule of negative phase-sequence, after three H bridge modules input multiwinding transformers, it is related to that the output power of the multiwinding transformer is equal to the synthesis of three port input powers according to power-balance, secondary pulsating power offsets each other, only DC component is transferred to DC output end.DC capacitor in cascaded H-bridges can be substantially reduced the volume of DC capacitor, and then reduce the volume of electric power electric transformer, reduce the voltage and current stress of power device without storing pulsating power.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of electric power electric transformer circuit, power electronics
The control method of transformer and electric power electric transformer.
Background technique
Electric power electric transformer (power electronics transformer, PET) compares traditional Industrial Frequency Transformer
(Line Frequency Transformer, LFT), not only can significantly reduce the body of transformer and passive filtering element in system
Long-pending and weight can also realize the function such as reactive compensation, harmonic compensation, power flowcontrol, redundancy backup, electric power system fault protection
Can, it is one of developing key technology of smart grid.Electric power electric transformer is applicable not only to traditional AC/AC electric energy and becomes
It changes, it can also be used to AC/DC Power System Interconnection.In high pressure, powerful AC/DC application, electric power electric transformer becomes compared to power frequency
Depressor can significantly reduce the volume, weight and loss of system, with significant economic benefit and considerable application prospect.
In high pressure, high-power applications occasion, electric power electric transformer generallys use more level with modular construction
Topology, to improve the reliability of system.According to the development of current modular multilevel topology, AC/DC type electric power electric transformer
It can be divided into based on cascaded H-bridges converter (cascaded H-bridge, CHB) and based on Modular multilevel converter
(modular multilevel converter, MMC) two major classes topology.
Electric power electric transformer based on cascaded H-bridges: including that three-class power electronics converts altogether.The first order is connection exchange
The cascaded H-bridges of power grid, the H bridge in cascaded H-bridges realize AC/DC transformation；The second level is DC/AC high-frequency inversion, and it is high that connection is surveyed in exchange
Frequency power transformer；The third level is the AC/DC transformation of high frequency transformer connection.Two H bridging parallel operations of the second level and the third level and in
Between high frequency transformer be collectively referred to as double active bridges (dual active bridge, DAB).Every mutually all AC/DC converters it is straight
Stream side, which is connected in parallel, constitutes DC bus, can connect DC grid.
Electric power electric transformer based on Modular multilevel converter: alternating current net side connects three-phase modular multilevel
Converter, multiple capacitors of connecting on the DC bus of Modular multilevel converter, each capacitance connection one double active bridges,
The output DC side parallel of all double active bridges together, can access DC grid.Another kind is converted based on modular multilevel
The electric power electric transformer topology of device is that double active bridges are drawn from the capacitor of each submodule of Modular multilevel converter, most
Afterwards and the DC side parallel of double active bridges together.
The above-mentioned electric power electric transformer based on cascaded H-bridges, since the exchange input side of every phase introduces secondary pulsating power,
These secondary pulsating powers need biggish direct current perhaps secondary resonance branch to absorb.
The above-mentioned electric power electric transformer based on Modular multilevel converter, Modular multilevel converter submodule
Capacitor need to absorb fundamental wave pulsating power, the frequency than secondary pulsating power is lower, it is meant that there is still a need for very big capacitors
Pulsating power is stored, the volume of this partition capacitance occupies significant proportion in Modular multilevel converter total volume.
In conclusion pulsating power is introduced since exchange inputs in electric power electric transformer circuit in the prior art,
Have to that the biggish capacitor of volume is used to store pulsating power to prevent pulsating power from damaging circuit, to increase whole
The volume of a electric power electric transformer, is unfavorable for the simplification of system, and then is unfavorable for long term growth.
Therefore, how to solve that electric power electric transformer is needed to provide larger capacitance in power grid to store exchange input introducing
The problem of pulsating power is the technological means that those skilled in the art need to solve.
Summary of the invention
The object of the present invention is to provide a kind of electric power electric transformer circuit, electric power electric transformer and power electronics transformations
The control method of device, in the volume for avoiding pulsating power from reducing required capacitor under the premise of damaging mains-power circuit.
In order to solve the above technical problems, the present invention provides a kind of electric power electric transformer circuit, including input terminal and three-phase
AC network connection H bridge module, the multiwinding transformer that input terminal is connect with the output end of the H bridge module, input terminal and
The second rectification H bridge that output end connection, output end and the DC grid of the multiwinding transformer connect；
Wherein, each H bridge module includes the first rectification H bridge and rectifies the inversion H that H bridging connects with described first
Bridge, each first rectification H bridge constitute cascaded H-bridges；
The H bridge module includes the first H bridge mould that input terminal is connect with three phase lines of the three-phase AC grid respectively
Block, the 2nd H bridge module and the 3rd H bridge module；
The first input end of the multiwinding transformer is connect with the output end of the first H bridge module, the Multiple coil
Second input terminal of transformer is connect with the output end of the 2nd H bridge module, the third input terminal of the multiwinding transformer
It is connect with the output end of the 3rd H bridge module, and a multiwinding transformer and the first H bridge module, one
A 2nd H bridge module and a 3rd H bridge module uniquely correspond to.
In order to solve the above technical problems, the present invention also provides a kind of electric power electric transformer, including above-mentioned power electronics
Transformer circuit, further includes:
Detection circuit for Acquisition Circuit parameter；
The controller being connect respectively with each H bridge module, each second rectification H bridge and the detection circuit, for according to
Circuit parameter carries out closed-loop control, the control instruction to each H bridge module and/or the second rectification H bridge is generated, so that respectively
The input power of the H bridge module balances.
In order to solve the above technical problems, the present invention also provides a kind of control method of electric power electric transformer, based on above-mentioned
Electric power electric transformer, comprising:
Detection circuit Acquisition Circuit parameter；
Controller carries out closed-loop control according to the circuit parameter, generates and rectifies H bridge to each H bridge module and/or second
Control instruction, so that the input power of each H bridge module balances.
Optionally, the circuit parameter specifically includes the AC current values and each H bridge mould of the three-phase AC grid
The voltage value of DC capacitor in block；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate to each H bridge module and/or the
The control instruction of two rectification H bridges specifically includes so that the input power of each H bridge module balances:
The controller calculates the average voltage of the voltage value of each DC capacitor；
The controller generates AC input current instruction according to the difference of preset voltage value and the average voltage
Active component；
Reactive component and the alternating current of the controller to the active component, the instruction of preset AC input current
Stream carries out closed-loop control and generates modulating wave instruction；
The modulating wave is instructed and is distributed by SPWM modulation strategy to each first rectification H bridge by the controller.
Optionally, the modulating wave is instructed and is distributed by SPWM modulation strategy to each first rectification H bridge by the controller,
It specifically includes:
The controller carries out closed loop control to the voltage value of each DC capacitor, and in conjunction with the DC capacitor
The polarity of corresponding ac-side current generates the regulated quantity of the H bridge module where the DC capacitor；
The controller is generated according to the regulated quantity of the H bridge module and modulating wave instruction in the H bridge module
First rectification H bridge switching device control instruction.
Optionally, the circuit parameter specifically includes the DC voltage value of the DC grid, the three-phase AC grid
AC current values and the three-phase AC grid ac voltage；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate to each H bridge module and/or the
The control instruction of two rectification H bridges specifically includes so that the input power of each H bridge module balances:
The controller carries out closed-loop control to the DC voltage value and generates dc power instruction；
Before the ac voltage and AC current values progress pulsating power extraction is calculated in the controller
Feedback instruction；
The controller is according to dc power instruction and feedforward instruction generation to the inversion H bridge and described the
The control instruction of two rectification H bridges.
Optionally, the circuit parameter specifically includes the DC voltage value of the DC grid, the three-phase AC grid
AC current values, the three-phase AC grid ac voltage and each H bridge module DC capacitor voltage value；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate to each H bridge module and/or the
The control instruction of two rectification H bridges, so that the input power of each H bridge module balances, so that each input power balance, tool
Body includes:
The controller carries out closed-loop control to the DC voltage value and generates dc power instruction；
Before the ac voltage and AC current values progress pulsating power extraction is calculated in the controller
Feedback instruction；
The controller carries out secondary pulsating volage to the voltage value of each DC capacitor and controls to obtain feedback command；
The controller is instructed according to the dc power, feedforward instruction and the feedback command are generated to described inverse
Become the control instruction of H bridge and the second rectification H bridge.
Optionally, the controller is instructed according to the dc power, feedforward instruction and the feedback command generate
To the control instruction of the inversion H bridge and the second rectification H bridge, specifically include:
Value, the value of the feedforward instruction and the value of the feedback command that the controller instructs the dc power are asked
With obtain power instruction summation；
The controller calculates the average voltage of the voltage value of each DC capacitor；
The controller obtains the input terminal and output end of a phase T-type equivalent circuit of the electric power electric transformer circuit
Between leakage inductance and；
The controller is according to the power instruction summation, the average voltage and the leakage inductance and calculates phase shifting angle；
The controller carries out phase shifting control according to the phase shifting angle, generates the switch element to the inversion H bridge and institute
State the control instruction of the switch element of the second rectification H bridge.
Optionally, it is described according to the power instruction summation, the average voltage and the leakage inductance and calculate phase shifting angle,
It is calculated especially by following formula:
Wherein, the φ is the phase shifting angle, the pinFor the power instruction summation, the ωsFor three intersection
The angular frequency of galvanic electricity net, the LtFor the leakage inductance and the UdcFor the DC voltage value, the UcFor the average voltage
Value.
Electric power electric transformer circuit provided by the present invention, the H bridge mould being connect including input terminal with three-phase AC grid
The output end of block, the multiwinding transformer that input terminal is connect with the output end of H bridge module, input terminal and multiwinding transformer connects
It connects, the second rectification H bridge of output end and DC grid connection；Wherein, each H bridge module includes the first rectification H bridge and with
The inversion H bridge that one rectification H bridging connects, each first rectification H bridge constitute cascaded H-bridges；H bridge module includes that input terminal intersects with three respectively
The first H bridge module, the 2nd H bridge module and the 3rd H bridge module of three phase lines connection of galvanic electricity net；The first of multiwinding transformer
Input terminal is connect with the output end of the first H bridge module, the second input terminal of multiwinding transformer and the output end of the 2nd H bridge module
Connection, the third input terminal of multiwinding transformer is connect with the output end of the 3rd H bridge module, and a multiwinding transformer and one
A first H bridge module, a 2nd H bridge module and a 3rd H bridge module uniquely correspond to.First H bridge module, the 2nd H bridge mould
Block and the 3rd H bridge module are connect with the triple line of three-phase alternating-current supply respectively, and the input power of each H bridge module includes direct current
(i.e. active) component and secondary flutter component, secondary pulsating power in three-phase symmetrical, negative phase-sequence rule, by the first H bridge module,
After 2nd H bridge module and the power input multiwinding transformer of the 3rd H bridge module input, which is related to according to power-balance
The output power of transformer is equal to the synthesis of three port input powers, and secondary pulsating power offsets each other, and only DC component passes
It is handed to DC output end.Therefore on avoiding the problem that pulsating power damage mains-power circuit, power electronics provided by the invention becomes
DC capacitor in transformer circuits can be substantially reduced the volume of DC capacitor, and then reduce electric power without storing pulsating power
The volume of electronic transformer reduces the voltage and current stress of power device, improves system power-density.The present invention also provides one kind
The control method of electric power electric transformer and electric power electric transformer has above-mentioned beneficial effect, and details are not described herein.
Detailed description of the invention
It, below will be to embodiment or existing for the clearer technical solution for illustrating the embodiment of the present invention or the prior art
Attached drawing needed in technical description is briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some 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 a kind of circuit diagram of electric power electric transformer circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of equivalent circuit diagram of first rectification H bridge provided in an embodiment of the present invention；
Fig. 3 is a kind of equivalent circuit diagram of electric power electric transformer circuit provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of the control method of electric power electric transformer provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the specific embodiment of step S40 in the first Fig. 4 provided in an embodiment of the present invention；
Fig. 6 is the control block diagram of the first rectification H bridge provided in an embodiment of the present invention；
Fig. 7 is the flow chart of the specific embodiment of step S40 in second of Fig. 4 provided in an embodiment of the present invention；
Fig. 8 is the flow chart of the specific embodiment of step S40 in the third Fig. 4 provided in an embodiment of the present invention；
Fig. 9 is the control block diagram of inversion H bridge provided in an embodiment of the present invention and the second rectification H bridge；
Figure 10 (a) is a kind of exchange input side voltage provided in an embodiment of the present invention, electric current input and output static Simulation wave
Shape figure；
Figure 10 (b) is a kind of DC output side voltage simulation waveform provided in an embodiment of the present invention；
Figure 11 (a) is a kind of input power simulation waveform of multiwinding transformer provided in an embodiment of the present invention；
Figure 11 (b) is a kind of output power simulation waveform of multiwinding transformer provided in an embodiment of the present invention；
Figure 12 is the dynamic regulation waveform diagram of DC capacitor voltage in a kind of list H bridge module provided in an embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of electric power electric transformer circuit, electric power electric transformer and power electronics transformation
The control method of device, in the volume for avoiding pulsating power from reducing required capacitor under the premise of damaging mains-power circuit.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of circuit diagram of electric power electric transformer circuit provided in an embodiment of the present invention；Fig. 2 is that the present invention is implemented
One kind first that example provides rectifies the equivalent circuit diagram of H bridge；Fig. 3 is a kind of electric power electric transformer provided in an embodiment of the present invention
The equivalent circuit diagram of circuit.
As shown in Figure 1, electric power electric transformer circuit includes the H bridge module that input terminal is connect with three-phase AC grid, it is defeated
Enter the multiwinding transformer that end is connect with the output end of H bridge module, output end connection, the output of input terminal and multiwinding transformer
Hold the second rectification H bridge connecting with DC grid；
Wherein, each H bridge module include the first rectification H bridge and with the first inversion H bridge for connecing of rectification H bridging, each first
It rectifies H bridge and constitutes cascaded H-bridges；
H bridge module includes the first H bridge module, the 2nd H that input terminal is connect with three phase lines of three-phase AC grid respectively
Bridge module and the 3rd H bridge module；
The first input end of multiwinding transformer is connect with the output end of the first H bridge module, and the second of multiwinding transformer
Input terminal is connect with the output end of the 2nd H bridge module, the third input terminal of multiwinding transformer and the output end of the 3rd H bridge module
Connection, and a multiwinding transformer and a first H bridge module, a 2nd H bridge module and a 3rd H bridge module are unique
It is corresponding.
In specific implementation, input side includes the transformation of three-class power electronics to outlet side in total: the first order is high-frequency rectification,
Corresponding first rectification H bridge AC/DC；The second level is high-frequency inversion, corresponding inversion H bridge DC/AC；The third level is high-frequency rectification, corresponding
Second rectification H bridge AC/DC.First rectification H bridge AC/DC cascade constitutes cascaded H-bridges.
Defining H bridge module includes that input terminal is connect with three phase lines of three-phase AC grid (a phase, b phase, c phase) respectively
First H bridge module a_1~a_N, the 2nd H bridge module b_1~b_N and the 3rd H bridge module c_1~c_N, each H bridge module include
First rectification H bridge AC/DC and inversion H bridge DC/AC, and be connected between the first rectification H bridge and inversion H bridge for stable DC electricity
The DC capacitor C of pressure.
Electrical isolation is carried out using the mono- output multiwinding transformer of three inputs-between the second level and the third level, is specifically connected
It connects mode and connects i-th respectively for i-th of the oneth H bridge module a_i, i-th of the 2nd H bridge module b_i, i-th of the 3rd H bridge module c_i
Three input terminals (i≤N) of a multiwinding transformer.The output end of each multiwinding transformer connects one second rectification H bridge
AC/DC (hf rectifier) forms DC feeder after the output end of N number of second rectification H bridge is in parallel altogether.
Referring to FIG. 2, the first rectification H bridge AC/DC, the rectification of inversion H bridge DC/AC and second H bridge AC/DC are that H bridging changes
Device, one switch element of each routing are constituted, and such as the first rectification H bridge AC/DC includes switch element S1, S2, S3 and S4.
Referring to FIG. 3, by taking the first H bridge module as an example, the first rectification H bridge AC/DC include switch element S1, S2, S3 and
S4, inversion H bridge DC/AC include switch element S5, S6, S7 and S8, and the second rectification H bridge AC/DC includes S9, S10, S11 and S12.
It is considered that cascaded H-bridges include 3N the first H bridge modules shown in Fig. 3, therefore the electric power electric transformer circuit in the present invention
Still there is modular structure.
If a phase input voltage usa, electric current isaAre as follows:
usa=Us sin(w1t)
Wherein UsFor phase voltage amplitude, IsFor phase current magnitude, w1It is power-factor angle for fundamental wave frequency.Think to input
Power equiblibrium mass distribution between each H bridge module, by taking the first H bridge module a_1 as an example, input power ps_a1Are as follows:
The input power p of the 2nd H bridge module b_1, the 3rd H bridge module c_1 are obtained in the case where three-phase symmetricals_b1、ps_c1:
The input power of each H bridge module of electric power electric transformer circuit includes direct current (i.e. active) component and secondary pulsation
Component, secondary pulsating power is in three-phase symmetrical, the rule of negative phase-sequence, amplitude P2With active power size PdcIt is equal.
Electric power electric transformer circuit in the prior art, secondary pulsating power can only be by electric power electric transformer modules
DC capacitor absorb, it is therefore desirable to biggish DC capacitor.
And in embodiments of the present invention, the first H bridge module a_1, the 2nd H bridge module b_1 of electric power electric transformer circuit
The input terminal of the 1st multiwinding transformer is respectively connected to the outlet side of the 3rd H bridge module c_1, similarly i-th of the oneth H bridge moulds
Block a_i, i-th of the 2nd H bridge module b_i, i-th of the 3rd H bridge module c_i connect i-th of multiwinding transformer respectively three are defeated
Enter end.It is related to that the output power of the multiwinding transformer is equal to the synthesis of three port input powers according to power-balance, it is secondary
Pulsating power offsets each other, and only DC component is transferred to direct current output.If the pulsating power of alternating current net side input also all passes
It is handed to the power channels being made of multiwinding transformer:
The power p then finally exportedo1Are as follows:
Wherein, pin_a1、pin_b1、pin_c1The input power of a phase, b phase, c phase respectively in three-phase circuit.
The H bridge module provided in an embodiment of the present invention being connect including input terminal with three-phase AC grid, input terminal and H bridge mould
Output end connection, output end and the direct current of the multiwinding transformer of the output end connection of block, input terminal and multiwinding transformer
Second rectification H bridge of net connection；Wherein, each H bridge module includes the first rectification H bridge and connects with the first rectification H bridging inverse
Become H bridge, each first rectification H bridge constitutes cascaded H-bridges；H bridge module include input terminal respectively with three phase lines of three-phase AC grid
The first H bridge module, the 2nd H bridge module and the 3rd H bridge module of connection；The first input end of multiwinding transformer and the first H bridge
The output end of module connects, and the second input terminal of multiwinding transformer is connect with the output end of the 2nd H bridge module, Multiple coil transformation
The third input terminal of device is connect with the output end of the 3rd H bridge module, and a multiwinding transformer and a first H bridge module,
One the 2nd H bridge module and a 3rd H bridge module uniquely correspond to.First H bridge module, the 2nd H bridge module and the 3rd H bridge module
It is connect respectively with the triple line of three-phase alternating-current supply, the input power of each H bridge module includes direct current (i.e. active) component and two
Secondary flutter component, secondary pulsating power is in three-phase symmetrical, the rule of negative phase-sequence, by the first H bridge module, the 2nd H bridge module and the
After the power input multiwinding transformer of three H bridge modules input, the output work of the multiwinding transformer is related to according to power-balance
Rate is equal to the synthesis of three port input powers, and secondary pulsating power offsets each other, and only DC component is transferred to DC output end.
Therefore the direct current on avoiding the problem that pulsating power damage mains-power circuit, in electric power electric transformer circuit provided by the invention
Capacitor is not necessarily to store pulsating power, can be substantially reduced the volume of DC capacitor, and then reduce the volume of electric power electric transformer,
The voltage and current stress of power device is reduced, system power-density is improved.
The corresponding embodiment of electric power electric transformer circuit as detailed above, on this basis, the invention also discloses with
The corresponding electric power electric transformer of above-mentioned electric power electric transformer circuit, the electric power electric transformer, including above-described embodiment institute
The electric power electric transformer circuit stated, further includes:
Detection circuit for Acquisition Circuit parameter；
The controller being connect respectively with each H bridge module, each second rectification H bridge and detection circuit, for according to circuit parameter
Closed-loop control is carried out, the control instruction to each H bridge module and/or the second rectification H bridge is generated, so that the input work of each H bridge module
Rate balance.
Electric power electric transformer circuit provided by the above embodiment is opposite in three based on the secondary pulsating power of three-phase input
Claim, the rule of negative phase-sequence, is offset by multiwinding transformer.But in actual operation, due to element difference, operating status
The reasons such as difference, each H bridge module can not be completely counterbalanced by the pulsating power in the input power of multiwinding transformer, in order to keep away
Exempt from damage of the pulsating power to circuit, DC capacitor also needs to consider that the function of storing pulsating power is designed.It is further
Reduce pulsating power remaining in H bridge module, reduce the volume of DC capacitor, by detecting the circuit parameter of mains-power circuit come really
The difference of pulsating power in fixed each H bridge module, controller control the flat of the pulsating power in each H bridge module by circuit parameter
Weighing apparatus, to eliminate pulsating power by multiwinding transformer as far as possible.
It mentions in the above-described embodiments, input side to outlet side includes the transformation of three-class power electronics in total, respectively corresponds the
One rectification H bridge, inversion H bridge and the second rectification H bridge, the first rectification H bridge AC/DC, the rectification of inversion H bridge DC/AC and second H bridge AC/
DC is H bridging parallel operation, and each branch can be equivalent to and be made of a switch element.Therefore in specific implementation, control
Device can control the balance of pulsating power in each H bridge module by controlling the on-off of each switch element.
Electric power electric transformer provided in an embodiment of the present invention, including electric power electric transformer provided by the above embodiment electricity
Road is generated according to circuit parameter to each H bridge module and/or the second rectification H by detection circuit Acquisition Circuit parameter by controller
The control command of bridge so that the input power of each H bridge module balances, can on the basis of electric power electric transformer circuit, into
One step reduces the residual of pulsating power, to further decrease the volume of required DC capacitor.
The corresponding embodiment of electric power electric transformer as detailed above, on this basis, the invention also discloses with it is above-mentioned
The control method of the corresponding electric power electric transformer of electric power electric transformer.
Fig. 4 is a kind of flow chart of the control method of electric power electric transformer provided in an embodiment of the present invention.Such as Fig. 4 institute
Show, based on the above embodiment in electric power electric transformer, the control method of electric power electric transformer, comprising:
S40: detection circuit Acquisition Circuit parameter.
S41: controller carries out closed-loop control according to circuit parameter, generates to H bridge module and/or is connected to Multiple coil transformation
The control instruction of second rectification H bridge of the output end of device, so that each input power balances.
In specific implementation, the control of the electric power electric transformer circuit and controller that are provided based on the embodiment of the present invention
Thought, those skilled in the art can carry out closed loop by circuit parameters such as acquisition electric current, voltages with the standard value of this and setting
Control generates the control instruction of the second rectification H bridge to each H bridge module and/or the output end for being connected to multiwinding transformer, with
Achieve the purpose that the input power balance of each H bridge module.
Fig. 5 is the flow chart of the specific embodiment of step S40 in the first Fig. 4 provided in an embodiment of the present invention；Fig. 6 is
The control block diagram of first rectification H bridge provided in an embodiment of the present invention.
On the basis of the above embodiments, in another embodiment, circuit parameter specifically includes the friendship of three-phase AC grid
The voltage value of the DC capacitor of galvanic electricity flow valuve and each H bridge module；
Correspondingly, step S40 is specifically included:
S50: controller calculates the average voltage of the voltage value of each DC capacitor；
S51: controller generates the active of AC input current instruction according to the difference of preset voltage value and average voltage
Component；
S52: controller closes the reactive component and alternating current of active component, the instruction of preset AC input current
Ring control generates modulating wave instruction；
S53: modulating wave is instructed and is distributed by SPWM modulation strategy to each first rectification H bridge by controller.
DC voltage can realizing each H bridge module by the control between the first rectification H bridge AC/DC is balanced, and then makes
Input power balance.
In specific implementation, as shown in fig. 6, first according to the sampled value u of DC capacitor voltage in all H bridge modulesCxj(x
=a, b, c；J=1~n) find out its total average value uC, control it as instruction value uC*, controller output is exchange input electricity
Stream instruction active component isd*.The reactive component i of AC input current instructionsq* it can be set to 0.The three-phase alternating current that will test
The AC current values i of power gridsa, isb, iscI is converted to through abc/dq rotating coordinate transformationsd, isq。isdAnd isqIt is raw through closed-loop control
U is instructed at modulating waverdAnd urq, then u obtained by dq/abc inverse transformationra, urb, urc, pass through the SPWM modulation strategy of more level
Distribute to the first rectification H bridge in cascade each H bridge module.
Further, step S53 may include:
Controller carries out closed loop control to the voltage value of each DC capacitor, and combines exchange corresponding to DC capacitor
The polarity of side generates the regulated quantity of the H bridge module where DC capacitor；
Controller generates opening to the first rectification H bridge in H bridge module according to the instruction of the regulated quantity and modulating wave of H bridge module
Close the control instruction of device.
As shown in fig. 6, carrying out closed loop control to the voltage value of each DC capacitor, and combine the phase ac-side current
Polarity judge symbol (positive and negative) that the regulated quantity that the two is multiplied to obtain the H bridge module modulating wave is superimposed with modulating wave, generate to each
The control instruction of H bridge module.The control instruction (is opened as shown in Figure 3 eventually by the switching device that driving first rectifies H bridge
Close device S1~S4) on-off execute.
Fig. 7 is the flow chart of the specific embodiment of step S40 in second of Fig. 4 provided in an embodiment of the present invention.
On the basis of the above embodiments, in another embodiment, circuit parameter specifically includes the direct current of DC grid
The ac voltage of pressure value, the AC current values of three-phase AC grid and three-phase AC grid；
Correspondingly, step S40 is specifically included:
S70: controller carries out closed-loop control to DC voltage value and generates dc power instruction；
S71: controller carries out pulsating power extraction to ac voltage and AC current values and feedforward instruction is calculated；
S72: controller is instructed according to dc power and feedforward instruction generates the control to inversion H bridge and the second rectification H bridge
Instruction.
The 2nd grade of electric power electric transformer circuit and 3rd level are the realization links of decoupling control, pass through and drive inversion H bridge
It is realized with the second rectification H bridge (switching device S5~S12 in such as Fig. 3).
In order to inhibit voltage change caused by the fluctuation of load, to DC voltage value udcClosed-loop control is carried out, output is function
The direct current component p of rate instructiondc*.So that capacitor in H bridge module is not absorbed secondary pulsating power, needs ac input power ps
In quadratic component ps_2All it is transferred to the input side of multiwinding transformer.The secondary arteries and veins of the every phase input of three-phase alternating current net side
Dynamic power passes through detection ac voltage usx(x=a, b, c) and AC current values isxIt is calculated after (x=a, b, c), as
The feedforward of power instruction instructs, i.e.,
P is instructed by dc powerdc* it is instructed with feedforwardIt generates to the derailing switch in inversion H bridge and the second rectification H bridge
The control instruction of part (switching device S5~S12 in such as Fig. 3).
Fig. 8 is the flow chart of the specific embodiment of step S40 in the third Fig. 4 provided in an embodiment of the present invention；Fig. 9 is
The control block diagram of inversion H bridge provided in an embodiment of the present invention and the second rectification H bridge.
On the basis of the above embodiments, in another embodiment, circuit parameter specifically includes the direct current of DC grid
Pressure value, the AC current values of three-phase AC grid, the ac voltage of three-phase AC grid and each H bridge module DC capacitor
Voltage value；
Correspondingly, step S40 is specifically included:
S80: controller carries out closed-loop control to DC voltage value and generates dc power instruction；
S81: controller carries out pulsating power extraction to ac voltage and AC current values and feedforward instruction is calculated；
S82: controller carries out secondary pulsating volage to the voltage value of each DC capacitor and controls to obtain feedback command；
S83: controller is instructed according to dc power, feedforward instruction and feedback command are generated to inversion H bridge and the second rectification H
The control instruction of bridge.
Wherein, step S80 to step S81 can be with reference to the specific descriptions in above-described embodiment.To each DC DC capacitor
Voltage value carry out secondary pulsating volage control, i.e., carry out closed loop with 0 for voltage value of the control instruction to each DC DC capacitor
Control, the feedback command of output power instruction
As shown in figure 9, to udc *And udcAdditive operation is carried out, and carries out DC voltage control and obtains dc power instruction
pdc*；To usx(x=a, b, c) and isx(x=a, b, c) carries out pulsating power extraction operation and obtains feedforward instructionTo direct current
The voltage value of DC capacitor carries out secondary flutter component extraction and takes negative, carries out secondary pulsating power control, obtains feedback command
P is instructed according to dc powerdc*, feedforward instructionAnd feedback commandIt generates and inversion H bridge and second is rectified
The control instruction of switching device (switching device S5~S12 in such as Fig. 3) in H bridge.
Further, step S83 can specifically include:
The value p that controller instructs dc powerdc*, the value of feedforward instructionAnd feedback commandValue sum
To power instruction summation:
Controller calculates the average voltage U of the voltage value of each DC DC capacitorc；
Controller obtains the leakage between the input terminal and output end of a phase T-type equivalent circuit of electric power electric transformer circuit
Sense and Lt；
Controller is according to power instruction summation pin, average voltage UcWith leakage inductance and LtCalculate phase shifting angle φ；
Controller carries out phase shifting control according to phase shifting angle, generates and rectifies opening for H bridge to the switch element of inversion H bridge and second
Close the control instruction of element.
Wherein, leakage inductance and LtIt can be obtained by calculation, can also preset.The H of the input terminal of multiwinding transformer
The square wave that side voltage is duty ratio D=0.5 that exchanges of bridge module and the inversion H bridge of output end, and two ac square-wave voltages
Between phase differenceIt is calculated according to transimission power instruction, the phase differenceIncluding DC component and AC ripple component.
Phase shifting angle φ can be specifically calculated by the following formula:
Wherein, φ is phase shifting angle, pinFor power instruction summation, ωsFor the angular frequency of three-phase AC grid, LtFor the leakage
Sense and UdcFor DC voltage value, UcFor average voltage.
Figure 10 (a) is a kind of exchange input side voltage provided in an embodiment of the present invention, electric current input and output static Simulation wave
Shape figure；Figure 10 (b) is a kind of DC output side voltage simulation waveform provided in an embodiment of the present invention；Figure 11 (a) is the present invention
A kind of input power simulation waveform for multiwinding transformer that embodiment provides；Figure 11 (b) is provided in an embodiment of the present invention
A kind of output power simulation waveform of multiwinding transformer；Figure 12 is in a kind of list H bridge module provided in an embodiment of the present invention
The dynamic regulation waveform diagram of DC capacitor voltage.
The model that electric power electric transformer circuit provided by the present application is built using MATLAB/Simulink, is emulated
Experimental verification, simulation parameter are as follows:
In the steady state, exchange input side voltage current waveform such as Figure 10 (a) is shown, alternating current for electric power electric transformer circuit
Stream is in unity power factor sine wave, and since the effect of Multilevel modulation improves equivalent switching frequency, alternating current harmonic wave contains
Amount is few.As shown in Figure 10 (b), for the voltage stabilization of DC output side in 750V, waveform is smoother, is practically free of secondary pulsation point
Amount.
Power waveform such as Figure 11 of the former pair side of the power channels (high frequency multiwinding transformer) of electric power electric transformer circuit
(a) and shown in Figure 11 (a), the input power of 3 windings is that dc power is superimposed secondary flutter component, wherein secondary pulsation
Power is obtained according to decoupling control.After power channels couple, dc power is only transmitted in pair side.
Dynamic of the capacitance voltage in power decoupled control start-up course in the single H bridge module of electric power electric transformer circuit
Adjustment process is as shown in figure 12.In Figure 12, t=t1At the moment, decoupling control starting, the peak-to-peak value of capacitance voltage pulsation is from 23.3%
It is rapidly reduced to 4%, demonstrates the validity of decoupling control.
Simulation result shows electric power electric transformer circuit, electric power electric transformer and its controlling party that the application proposes
Method can be realized the interconnection of three-phase AC grid and DC grid, power transmission, and the DC capacitor electricity in its internal module
Pressure is free of secondary flutter component, reliability and power density with higher.
In several embodiments provided herein, it should be understood that disclosed electric power electric transformer circuit, electricity
The control method of power electronic transformer and electric power electric transformer, may be implemented in other ways.For example, described above
Installation practice it is only schematical, for example, the division of module, only a kind of logical function partition, in actual implementation
There may be another division manner, such as multiple module or components can be combined or can be integrated into another system or one
A little features can be ignored, or not execute.Another point, shown or discussed mutual coupling or direct-coupling or communication link
Connecing can be through some interfaces, the indirect coupling or communication connection of device or module, can be electrical property, mechanical or other shapes
Formula.Module may or may not be physically separated as illustrated by the separation member, the component shown as module
It may or may not be physical module, it can it is in one place, or may be distributed over multiple network modules
On.Some or all of the modules therein can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, can integrate in a processing module in each functional module in each embodiment of the application
It is that modules physically exist alone, can also be integrated in two or more modules in a module.
A kind of electric power electric transformer circuit provided by the present invention, electric power electric transformer and power electronics are become above
The control method of depressor is described in detail.Each embodiment is described in a progressive manner in specification, each embodiment
What is stressed is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, phase
Place is closed referring to method part illustration.It should be pointed out that for those skilled in the art, not departing from
, can be with several improvements and modifications are made to the present invention under the premise of the principle of the invention, these improvement and modification also fall into this hair
In bright scope of protection of the claims.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (9)
1. a kind of electric power electric transformer circuit, which is characterized in that the H bridge mould being connect including input terminal with three-phase AC grid
Block, the multiwinding transformer that input terminal is connect with the output end of the H bridge module, input terminal are defeated with the multiwinding transformer
The second rectification H bridge that outlet connection, output end and DC grid connect；
Wherein, each H bridge module includes the first rectification H bridge and rectifies the inversion H bridge that H bridging connects with described first, respectively
The first rectification H bridge constitutes cascaded H-bridges；
The H bridge module include input terminal connect respectively with three phase lines of the three-phase AC grid the first H bridge module,
Two H bridge modules and the 3rd H bridge module；
The first input end of the multiwinding transformer is connect with the output end of the first H bridge module, the Multiple coil transformation
Second input terminal of device is connect with the output end of the 2nd H bridge module, the third input terminal of the multiwinding transformer and institute
State the output end connection of the 3rd H bridge module, and a multiwinding transformer and the first H bridge module, an institute
It states the 2nd H bridge module and a 3rd H bridge module uniquely corresponds to.
2. a kind of electric power electric transformer, which is characterized in that including electric power electric transformer circuit described in claim 1, also
Include:
Detection circuit for Acquisition Circuit parameter；
The controller being connect respectively with each H bridge module, each second rectification H bridge and the detection circuit, for according to the circuit
Parameter carries out closed-loop control, generates the control instruction to each H bridge module and/or the second rectification H bridge, so that each described
The input power of H bridge module balances.
3. a kind of control method of electric power electric transformer, which is characterized in that be based on power electronics transformation as claimed in claim 2
Device, comprising:
Detection circuit Acquisition Circuit parameter；
Controller carries out closed-loop control according to the circuit parameter, generates the control to each H bridge module and/or the second rectification H bridge
Instruction, so that the input power of each H bridge module balances.
4. control method according to claim 3, which is characterized in that the circuit parameter specifically includes the three-phase alternating current
The voltage value of the AC current values of power grid and the DC capacitor in each H bridge module；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate whole to each H bridge module and/or second
The control instruction of stream H bridge specifically includes so that the input power of each H bridge module balances:
The controller calculates the average voltage of the voltage value of each DC capacitor；
The controller generates the active of AC input current instruction according to the difference of preset voltage value and the average voltage
Component；
The controller to the active component, preset AC input current instruction reactive component and the alternating current into
Row closed-loop control generates modulating wave instruction；
The modulating wave is instructed and is distributed by SPWM modulation strategy to each first rectification H bridge by the controller.
5. control method according to claim 4, which is characterized in that the controller passes through modulating wave instruction
SPWM modulation strategy is distributed to each first rectification H bridge, is specifically included:
The controller carries out closed loop control to the voltage value of each DC capacitor, and right in conjunction with the DC capacitor institute
The polarity for the ac-side current answered generates the regulated quantity of the H bridge module where the DC capacitor；
The controller is generated according to the regulated quantity of the H bridge module and modulating wave instruction to the in the H bridge module
The control instruction of the switching device of one rectification H bridge.
6. control method according to claim 3, which is characterized in that the circuit parameter specifically includes the DC grid
DC voltage value, the AC current values of the three-phase AC grid and the ac voltage of the three-phase AC grid；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate whole to each H bridge module and/or second
The control instruction of stream H bridge specifically includes so that the input power of each H bridge module balances:
The controller carries out closed-loop control to the DC voltage value and generates dc power instruction；
The controller is calculated feedforward and refers to the ac voltage and AC current values progress pulsating power extraction
It enables；
The controller is generated according to dc power instruction and feedforward instruction to inversion H bridge and the second rectification H
The control instruction of bridge.
7. control method according to claim 3, which is characterized in that the circuit parameter specifically includes the DC grid
DC voltage value, the AC current values of the three-phase AC grid, the ac voltage of the three-phase AC grid and each institute
State the voltage value of the DC capacitor of H bridge module；
Correspondingly, the controller carries out closed-loop control according to the circuit parameter, generate whole to each H bridge module and/or second
The control instruction of H bridge is flowed, so that the input power of each H bridge module balances, so that each input power balance, specific to wrap
It includes:
The controller carries out closed-loop control to the DC voltage value and generates dc power instruction；
The controller is calculated feedforward and refers to the ac voltage and AC current values progress pulsating power extraction
It enables；
The controller carries out secondary pulsating volage to the voltage value of each DC capacitor and controls to obtain feedback command；
The controller instructs according to the dc power, feedforward instruction and the feedback command are generated to inversion H bridge and
The control instruction of the second rectification H bridge.
8. control method according to claim 7, which is characterized in that the controller instructs according to the dc power,
The feedforward instruction and the feedback command generate the control instruction to the inversion H bridge and the second rectification H bridge, specific to wrap
It includes:
Value, the value of the feedforward instruction and the value of the feedback command that the controller instructs the dc power are summed
To power instruction summation；
The controller calculates the average voltage of the voltage value of each DC capacitor；
The controller obtains between the input terminal and output end of a phase T-type equivalent circuit of the electric power electric transformer circuit
Leakage inductance and；
The controller is according to the power instruction summation, the average voltage and the leakage inductance and calculates phase shifting angle；
The controller carries out phase shifting control according to the phase shifting angle, generates to the switch element of the inversion H bridge and described the
The control instruction of the switch element of two rectification H bridges.
9. control method according to claim 8, which is characterized in that described according to the power instruction summation, the electricity
It flattens mean value and the leakage inductance and calculates phase shifting angle, calculated especially by following formula:
Wherein, the φ is the phase shifting angle, the pinFor the power instruction summation, the ωsFor the three-phase alternating current
The angular frequency of net, the LtFor the leakage inductance and the UdcFor the DC voltage value, the UcFor the average voltage.
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