CN106452133A - Core converter for building bipolar DC microgrid and control method of core converter - Google Patents

Core converter for building bipolar DC microgrid and control method of core converter Download PDF

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Publication number
CN106452133A
CN106452133A CN201610853462.7A CN201610853462A CN106452133A CN 106452133 A CN106452133 A CN 106452133A CN 201610853462 A CN201610853462 A CN 201610853462A CN 106452133 A CN106452133 A CN 106452133A
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voltage
bridge
module
current
isolation level
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CN106452133B (en
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张国澎
胡治国
杨明
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Henan University of Technology
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Henan University of Technology
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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
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a core converter for building a bipolar DC microgrid. The core converter is taken as an interface converter of a high-voltage AC distribution network and a low-voltage bipolar DC microgrid. The core converter comprises three parts of an input filter, a rectifier stage and an isolation stage; and a modular design is adopted. An H-bridge cascade structure is adopted by the rectifier stage; an improved three-port active full-bridge structure is adopted by the modular isolation stage; and output buses are correspondingly connected in parallel, thereby achieving matching of grid voltage and power at two sides of the converter. The invention further discloses a control method of the converter. Vector control of zero-sequence voltage injection is adopted by the rectifier stage; and voltage and current double closed-loop decoupling phase-shifting control is adopted by the isolation stage. According to the core converter, energy can be freely exchanged between the distribution network and the microgrid and between two buses of the bipolar DC microgrid; and functional integration of traditional power frequency transformer, rectifier and voltage balancer for building the bipolar DC microgrid is achieved, so that the building mode of the bipolar DC microgrid is optimized and the power density of building equipment is improved.

Description

A kind of core current transformer building bipolarity direct-current micro-grid and its control method
Technical field
The present invention relates to electronic power convertor technical field, more particularly to a kind of build connecing of bipolarity direct-current micro-grid Mouth current transformer.
Background technology
The direct-current grid that bipolarity is powered, in the new forms of energy access efficiency such as photovoltaic, fuel cell, data center and machine room Power supplying efficiency, the load motility accessing with micro- source, the reliability powered, all many-sides such as system earth all show congenital Advantage.But it builds has particularity compared with other types direct-current micro-grid, is embodied in the construction of microgrid center line, and center line The equilibrium problem of voltage.Because, in bipolarity direct-current micro-grid, there are different access ways in load, micro- source, can cause bipolar extension Carry the unbalanced of power, thus lead to neutral voltage uneven.As a load is articulated between microgrid both positive and negative polarity bus, another negative Load is articulated between microgrid positive electrode bus and center line.
The structure of traditional double polarity DC microgrid, generally adopts two level or three-level rectifier to form dc bus；Will It is incorporated to dc bus again, the midpoint of capacitances in series is drawn center line, ultimately formed dc bus bipolarity after capacitor bank series connection Power supply；This kind of construction method, generally also needs to using special voltage equalizer, and the power of the bipolar carry of solution is unbalanced to ask Topic；The matching problem that bipolarity direct-current micro-grid is realized with the isolation exchanging distribution and voltage, power using Industrial Frequency Transformer.By This is visible, and the constructing plan of current bipolarity direct-current micro-grid has deficiency as follows：(1) two level or three-level rectifier, do not have The balanced capacity of standby neutral voltage, or balanced capacity is weaker；(2) need to arrange independent neutral voltage static organ；(3) power frequency becomes Depressor occupation of land is larger, quality is heavy, loss is big and noise is big, and this has become as realizes high power density and high efficiency power conversion One major obstacle of system.
Content of the invention
Problem to be solved：
In order to overcome the above-mentioned existing difficulty building bipolarity direct-current micro-grid with not enough, the present invention propose a kind of by power frequency transformation New converter topology and control method that device, commutator, balance of voltage device combine, as middle pressure exchange distribution with low The interconnecting interface core current transformer of pressure bipolarity direct-current micro-grid, thus optimizing the building mode of bipolarity direct-current micro-grid, raising sets Standby power density.
Technical scheme：
A kind of build bipolarity direct-current micro-grid core current transformer it is characterised in that：1. its topology includes input filter, rectification Level and isolation level three part-structure；2. modularized design；
Described input filter adopts inductance mode filter.Input filter input exchanges distribution with middle pressure and is connected, outfan It is connected with rectification stage AC；
Described rectification stage AC is connected with input filter outfan；Described rectification stage DC side and isolation level primary side phase Even；Described isolation level secondary side is connected with low voltage dipole direct-current micro-grid；
Described rectification stage includes commutator and output filter, and often mutually all using N number of H bridge cascade structure, N is certainly to described commutator So count.Described output filter adopts electric capacity mode filter, is connected in parallel on the DC side of each H bridge；
Described isolation level is made up of 3N mutually isostructural unit, and N is identical with rectification stage H bridge number.Each unit is included once Structure, high-frequency isolation transformer, secondary structure three part composition, described isolation level unit once with secondary structure be three H bridges Three port organizations that topology is formed；
Described isolation level primary side refers to the primary structure of all isolation level units；The secondary side of described isolation level refers to institute There is the secondary structure of isolation level unit；
The H bridge DC side of described isolation level unit primary structure and DC side parallel, AC and the high-frequency isolation of rectification stage H bridge Transformer primary side is connected；
H bridge 1 AC of described isolation level unit secondary structure is connected with high-frequency isolation transformer vice-side winding 1, H bridge 1 direct current The positive pole of side just extremely bipolarity dc bus, negative pole is the center line of bipolarity dc bus；The secondary knot of described isolation level unit H bridge 2 AC of structure is connected with high-frequency isolation transformer vice-side winding 2, H bridge 2 DC side just extremely bipolarity dc bus Center line, negative pole is the negative pole of bipolarity dc bus.The H bridge 1 of isolation level unit secondary structure and H bridge 2 DC side are all in parallel straight Stream electric capacity of voltage regulation, thus form bipolarity DC bus structure；
Described high-frequency isolation transformer is single primary side winding, two-pack side winding construction；
Described modularized design, refers to constitute a module by a H bridge of rectification stage and a unit of isolation level.Module AC is the AC of rectification stage H bridge, and the DC side of module is that the bipolarity direct current that isolation level unit secondary structure is formed is female The positive pole of line, center line and negative pole；
N number of module AC series connection, N is natural number, constitutes AC phase structure, three phase structures are connected into star, thus Constitute three-phase structure, form the AC of current transformer；The DC side of all modules is according to positive pole, center line, the corresponding polarity of negative pole simultaneously It is linked togather, form the DC side of the bipolar bus structure of current transformer.Thus ultimately forming core current transformer knot proposed by the present invention Structure；
It is connected that the AC of described core current transformer exchange distribution with middle pressure, the DC side of described core current transformer and low voltage dipole Property direct-current micro-grid be connected；
Semiconductor switch in described rectification stage and isolation level circuit is all using wholly-controled device such as IGBT or MOSFET.
Compared with prior art, the present invention provide a kind of structure bipolarity direct-current micro-grid core current transformer have following Beneficial technique effect：
(1) the new topological realization commutator of Industrial Frequency Transformer, two level or three Level Full Bridges topology and balance of voltage device Function is integrated so that the number of devices building bipolarity direct-current micro-grid reduces, and system constructing is simplified；
(2) adopt high frequency transformer to substitute Industrial Frequency Transformer, realize the isolation of exchange distribution and bipolarity direct-current micro-grid, simultaneously Transformator high frequency reduces the equipment volume building bipolarity direct-current micro-grid；
(3) newly the isolation level module of topology adopts three port organizations, is providing energy exchange path for current transformer both sides electrical network Meanwhile, also for providing the path of energy exchange in direct-current micro-grid between the bus of the two poles of the earth；
(4) system maintenance and extension are easy in modularized design.
Brief description
Fig. 1 is current transformer three-phase topological diagram proposed by the present invention.
Fig. 2 is converter module topological diagram proposed by the present invention.
Fig. 3 is module isolation level topological diagram.
Fig. 4 is H bridge topological diagram.
Fig. 5 is the former secondary voltage oscillogram of module isolation level high frequency transformer.
Fig. 6 is current transformer rectification stage control block diagram of the present invention.
Fig. 7 is module isolation level control block diagram.
Specific embodiment
A kind of current transformer of the bright offer of this law, for building bipolarity direct-current micro-grid, as high-voltage alternating distribution and low pressure The interface current transformer of bipolarity direct-current micro-grid.Using the rectification level structure of cascaded H-bridges, the high pressure of coupling exchange distribution；Using 3N The high-frequency isolation level of individual three port organizations realizes the isolation of current transformer both sides electrical network；By the 3N of isolation level three port secondary structures Corresponding output is in parallel, and realizes the structure of bipolarity direct-current micro-grid, and the voltage of bipolarity direct-current micro-grid, power match.Under Face combines accompanying drawing and concrete mode is described in more detail to the present invention.
Fig. 1 show the current transformer three-phase topology of the bright proposition of this law, including：Input filter 2 and current transformer 3.Input filter The input side of ripple device 2 is connected to middle pressure exchange distribution 1, and the outlet side of input filter 2 is connected to the input port of current transformer 3. The outfan of current transformer 3 constitutes bipolarity direct-current micro-grid, is connected with bipolarity direct-current micro-grid 7.
Input filter 2 adopts inductance mode filter, using three single-phase inductance or can adopt a three pole reactor, therefore Input filter 2 has three input ports and three output ports.
Current transformer 3 includes three identical phase structures：A phase structure 4, B phase structure 5, C phase structure 6.Often mutually input Port includes two input lines, and output port includes three output leads.The input line 8 of A phase structure 4 is defeated with input filter 2 Go out side corresponding ports to be connected, the input line 9 of B phase structure 5 is connected with the outlet side corresponding ports of input filter 2, C phase structure 6 Input line 10 be connected with the outlet side corresponding ports of input filter 2.The input line 11 of A phase structure 4 is defeated with B phase structure 5 Enter line 12, and the input line 13 of C phase structure 6 links together.Thus constituting the star-star connection of current transformer 3 AC.A phase is tied Structure 4, B phase structure 5, three output lead correspondences of C phase structure 6 are in parallel together, form bipolarity direct-current micro-grid positive electrode bus 14th, bipolarity direct-current micro-grid center line 15, bipolarity direct-current micro-grid negative electrode bus 16.
The phase structure of current transformer 3 by N number of structure identical module composition, as shown in Figure 2.Module is by module rectification stage 17 Form with module isolation level 18.Module rectification stage 17 adopts single-phase H bridge construction, DC side parallel filter capacitor 24.Module rectification Level 17 ACs and other module composition Cascade H bridge constructions, as the rectification stage of current transformer 3.
Taking a certain module in A phase structure 4 as a example, if this module is first module in A phase structure 4, module is handed over Stream side input line 19 is the input line 8 of A phase structure 4, this module AC input line 20 and second module in A phase structure 4 AC input line 19 is connected；If this module is n-th module, this module AC input line 19 and the A in A phase structure 4 The AC input line 20 of N-1 module in phase structure 4 is connected, the AC input line of n-th module in A phase structure 4 20 input lines 11 being A phase structure 4；If this module is k-th module in A phase structure 4, k is integer, span [2, N-1], then the AC input line 19 of kth module is connected with the AC input line 20 of kth -1 module in A phase structure 4, kth mould The AC input line 20 of block is connected with the AC input line 19 of kth+1 module in A phase structure 4, is consequently formed current transformer Exchange side structure.
Module output direct current side ports include three output leads, are positive pole 21, center line 22, negative pole 23 respectively.In current transformer 3 The positive pole 21 of the output lead of all modules is connected in parallel and constitutes bipolarity direct-current micro-grid positive electrode bus 14；All in current transformer 3 The center line 22 of the output lead of module is connected in parallel and constitutes bipolarity direct-current micro-grid center line 15；In current transformer 3, all modules is defeated The negative pole 23 of outlet is connected in parallel and constitutes bipolarity direct-current micro-grid negative electrode bus 16.
Module isolation level 18 structure is as shown in figure 3, by module isolation level 18 primary structure 25, high frequency transformer 26, module Isolation level 18 secondary structure 27 and output filter 30 form.Module isolation level 18 primary structure 25 adopts H bridge construction, input End is connected with module rectification stage 17 outfan, the former limit of module isolation level 18 primary structure 25 outfan and high frequency transformer 26 around Group is connected；High frequency transformer 26 is three-winding transformator, a primary side winding, two vice-side winding.Module isolation level 18 2 Secondary structure 27 is made up of with H bridge 29 H bridge 28.The AC of H bridge 28 is connected with high frequency transformer 26 vice-side winding 1, the friendship of H bridge 29 Stream side is connected with high frequency transformer 26 vice-side winding 2.H bridge 28 DC side positive pole is the positive pole that module exports direct current side ports 21；The DC side negative pole of H bridge 28 is connected with the DC side positive pole of H bridge 29, constitutes module center line 22；The DC side negative pole of H bridge 29 It is the negative pole 23 that module exports direct current side ports.Output filter 30 by be connected in parallel on module export the positive pole 21 of DC side with Capacitor between line 22, and it is connected in parallel on capacitor composition between the negative pole 23 of module output DC side and center line 22.
H bridge construction is as shown in figure 4, constitute S1, S2, S3, S4, full-control type power by four full-control type power semiconductors Semiconductor device can may also be employed MOSFET using IGBT, taking IGBT as a example.The colelctor electrode of S1 and S3 links together, S2 and S4 Emitter stage link together, constitute H bridge DC side；The emitter stage of S1 is linked together with the colelctor electrode of S2, the emitter stage of S3 Link together with the colelctor electrode of S4, constitute H bridge AC.
Current transformer stable operation of the present invention and functional realiey, control and need to realize：
(1) the rectification stage unit power factor rectifier of current transformer, completes high-voltage alternating to the conversion of direct current.Simultaneously it is desirable to rectification Parallel filtering electric capacity 24 voltage of all module rectification stage 17 DC sides is equal afterwards, and is equal to module rectification stage 17 DC voltage Setting value, that is,U dc_ref , as formula (1-1)：
(1-1)
WhereinU dc_a_1...,U dc_a_NFor current transformer A phase the 1st module ..., in Nth module, each module rectification stage 17 DC side is simultaneously The voltage of connection filter capacitor 24；WhereinU dc_b_1...,U dc_b_NFor current transformer B phase the 1st module ..., in Nth module, each module is whole The voltage of the parallel filtering electric capacity 24 of stream level 17 DC side；WhereinU dc_c_1...,U dc_c_NFor current transformer C phase the 1st module ..., The voltage of the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in N-module.
Define A phase the 1st module ..., the voltage of the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth module Sum isU dc_a_sum ；B phase the 1st module ..., the electricity of the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth module Pressure sum beU dc_b_sum ；C phase the 1st module ..., the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth module Voltage sum isU dc_c_sum , its relation meets formula (1-2)：
(1-2)
The control of current transformer rectification stage adopts vector controlled, and control block diagram is as shown in fig. 6, control method is as follows：
The first step, the angle of A phase voltage in pressure exchange distribution 1 in acquisitionθ
Three-phase voltage in pressure exchange distribution 1 in Sample ACu a 、u b 、u c , by the coordinate transform of three phase static to biphase rotation, Draw the voltage power-less component under two-phase rotating coordinate systemu q , transformation for mula is as shown in (1-3)：
(1-3)
Calculateu q Through PI controller, obtain rate correction amount Δω,This correction is added with 100 π, obtains current Angular velocityω s ,ω s (when this angle is more than 2 π, it is allowed to be 0, thus ensureing the angle information obtaining with 2 π Modulus of access after integration All in the range of 0 ~ 2 π), then by this angleθThe coordinate transform feeding back to formula (1-3) calculates in angle used, forms control Closed loop processed.This angleθIt is the angle of A phase voltage in currently middle pressure exchange distribution 1.
Second step, the electric current of decoupling AC side of converter input
The electric current of sampling current transformer input line 8i as , the electric current of input line 9i bs , the electric current of input line 10i cs .By three phase static To the coordinate transform (3S/2R decoupling conversion) of biphase rotation, three-phase current is changed into the watt current under rotating coordinate systemi d With Reactive currenti q .Shown in transformation for mula such as formula (1-4), the angle in formula adopts the first step to obtainθValue.
(1-4)
3rd step, controls the electric current of AC side of converter input
Calculate A, B, C three-phase the 1st module ..., the electricity of the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth module Pressure sumU dc_a_sum 、U dc_b_sum 、U dc_c_sum Meansigma methodssU dc_ave_sum , N*U dc_ref DeductU dc_ave_sum After PI controller, Obtain the set-point of current transformer rectification stage input current real componenti d_ref .Willi d_ref Deduct the current transformer being obtained by second step Input watt currenti d , obtain the real component of current transformer ac output voltage after PI controllerv d ；" 0 " deducts by second step The current transformer input reactive current obtainingi q , obtain the idle component of current transformer ac output voltage after PI controllerv q .Pass through The biphase coordinate transform (3S/2R decouples inverse transformation) rotating to three phase static, shown in transformation for mula such as formula (1-5).Thus obtaining The three-phase voltage modulating wave of the required synthesis of AC side of converteru as 、u bs 、u cs .
(1-5)
4th step, modulating wave injected zero-sequence voltage, the total voltage of balancing curent transformer A, B, C each phase DC side
By N*U dc_ref Deduct A phase the 1st module ..., the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth module Voltage sumU dc_a_sum , after PI controller, obtain A phase power back-off amountP ao；N*U dc_ref Deduct B phase the 1st mould Block ..., the voltage sum of the parallel filtering electric capacity 24 of each module rectification stage 17 DC side in Nth moduleU dc_b_sum , through PI control After device processed, obtain B phase power back-off amountP bo.Using formula (1-6), formula (1-7) and formula (1-8)：
(1-6)
(1-7)
(1-8)
Modulating wave can be tried to achieve needs the residual voltage amplitude of injectionU 0And angleθ 0：Thus obtaining the residual voltage injectingu 0 .Willu 0 With former modulating waveu as 、u bs 、u cs It is separately summed repairing of the three-phase voltage modulating wave obtaining the required synthesis of current transformer rectification stage AC Positive waveformu as_c 、u bs_c 、u cs_c , the current transformer rectification stage AC such voltage waveform of output, you can realize unity power factor Rectification, also can balancing curent transformer A, B, C each phase DC side total voltage, realize formula (1-2).
5th step, module rectification stage 17 dc-voltage balance controls
In current transformer A phase of the present invention, by the voltage setting value of module rectification stage 17 parallel filtering electric capacity 24U dc_ref Deduct kth (k For integer, span [1, N-1]) voltage of the parallel filtering electric capacity 24 of individual module rectification stage 17u a _ dc_k , through PI controller Obtain the coefficient ε of k-th module rectification stage 17 AC output current modulating wave afterwards a_k , this amount is multiplied byu as_c / N obtains finally The modulating wave of k-th module rectification stage 17 AC output of current transformer A phaseu a_k_m ；Can get final current transformer A using formula (1-9) The modulating wave of phase n-th module rectification stage 17 AC outputu a_N_m .Afterwards, by the way of SPWM, modulating wave is converted into The triangular carrier angle mutual deviation π/N of the H bridge semiconductor device of pwm signal control module rectification stage 17, wherein SPWM.
(1-9)
In the same manner, can get the modulating wave that current transformer B phase exports with C phase each module rectification stage 17 ACu b_x_m 、u c_x_m (x here For integer, span [1, N]).Controlled by this and can achieve that module rectification stage 17 DC voltage is equal, and be equal to setting valueU dc_ref , that is, meet the control requirement of formula (1-1).
The control of current transformer rectification stage can finally be realized by above five steps.
(2) isolation level requiring current transformer passes through control realization：First, energy is in module isolation level 18 primary structure 25 Isolation transmission with module isolation level 18 secondary structure 27；Second, energy is between two H bridges of module isolation level 18 secondary structure Transmission；3rd, the voltage between bipolarity direct-current micro-grid positive electrode bus 14 and bipolarity direct-current micro-grid center line 15U po , bipolarity is straight Voltage between stream microgrid positive pole center line 15 and bipolarity direct-current micro-grid negative electrode bus 16U on Equal, and it is equal to setting value, that is,U po =U on =U line _ ref .WhereinU line _ ref Setting value for bipolarity direct-current micro-grid busbar voltage.Thus, make unsteady flow utensil of the present invention Standby Industrial Frequency Transformer and the function of balance of voltage device.
As shown in figure 5, the friendship of module isolation level 18 primary structure H bridge AC, the H bridge 28 of secondary structure and H bridge 29 Stream side output waveform is the symmetrical alternating current square-wave voltage that positive-negative half-cycle respectively accounts for 50%.δ1For module isolation level 18 primary structure H bridge AC voltageu 1With module isolation level 18 secondary structure H bridge 28 AC voltageu 2Between angle.δ2For module isolation level 18 Primary structure H bridge AC voltageu 1With module isolation level 18 secondary structure H bridge 29 ACu 3Between angle.Wherein δ1, δ2 ∈[-π/2,π/2]；Module isolation level 18 high frequency transformer secondary 1 to the turn ratio of primary side winding isn 2, module isolation level 18 high frequency Transformer secondary 2 is respectively to the turn ratio of primary side windingn 3；u 2、u 3It is high frequency transformer secondary 1 voltageu 2' and high frequency transformer The voltage of secondary 2u 3' convert the voltage after former limit, shown in convert formula such as formula (1-10)：
(1-10)
The control of current transformer isolation level adopts phase shifting control, voltage, current double closed-loop, the trigger pulse phase of all isolation level modules With.Control block diagram is as shown in fig. 7, control method is as follows：
The first step, Voltage loop controls
Bipolarity direct-current micro-grid busbar voltage setting valueU line _ ref Deduct the DC voltage of module isolation level 18 secondary H bridge 28U po Afterwards, after PI controller, obtain the set-point of H bridge 28 DC side output currenti dc_28_ref ；Bipolarity direct-current micro-grid is female Line voltage setting valueU line _ ref Deduct the DC voltage of module isolation level 18 secondary H bridge 29UonAfterwards, obtain through PI controller Set-point to H bridge 29 DC side output currenti dc_29_ref .
Second step, current loop control
i dc_28_ref Deduct H bridge 28 DC side output currenti dc_28, the coupling phase shifting angle Δ δ of H bridge 28 is obtained through PI controller1；i dc_29_ref Deduct H bridge 29 DC side output currenti dc_29, the coupling phase shifting angle Δ δ of H bridge 29 is obtained through PI controller2.
3rd step, uneoupled control is obtained with phase shifting angle
Δδ1With Δ δ2Decoupled through formula (1-11), obtained module isolation level 18 secondary H bridge 28 secondary with module isolation level 18 The phase shifting angle δ of side H bridge 29 AC voltage waveform1、δ2, in decoupling matricesG 11、G 12、G 21、G 22Can by formula (1-12), (1-13), (1-14), (1-15) tries to achieve.Whereinf s Operating frequency for module isolation level 18 high frequency transformer；L 1For high frequency transformer former limit Winding leakage inductance,L 2For high frequency transformer secondary 1 winding leakage inductance,L 3For high frequency transformer secondary 2 winding leakage inductance.L 12For high frequency transformation Equivalent conversion inductance between device primary side winding and secondary 1 winding,L 13For between high frequency transformer primary side winding and secondary 2 winding Equivalent conversion inductance,L 23For the equivalent conversion inductance between high frequency transformer secondary 1 winding and secondary 2 winding, convert formula As shown in formula (1-16).
(1-11)
(1-12)
(1-13)
(1-14)
(1-15)
(1-16)
According to phase shifting angle δ1、δ2Adjustment isolation level module secondary side H bridge 28 and the voltage of H bridge 29 AC, thus realize isolating The level transmission of energy and stablizing of bipolarity direct-current micro-grid busbar voltage.

Claims (4)

1. a kind of core current transformer building bipolarity direct-current micro-grid, for middle pressure exchange distribution and low voltage dipole direct-current micro-grid The two-way interconnection of energy it is characterised in that：
This current transformer includes input filter, rectification stage and isolation level three part；Using Modular Structure Design；
Described input filter input exchanges distribution with middle pressure and is connected, and outfan is connected with the AC of rectification stage；Rectification stage DC side is connected with isolation level primary side；Described rectification stage DC side is connected with isolation level primary side；Described isolation level secondary side It is connected with low voltage dipole direct-current micro-grid；
Described input filter adopts inductance mode filter；
Described inductance mode filter can adopt three single-phase inductance, and a three pole reactor may also be employed；
Described rectification stage is three-phase structure, including commutator and output filter；
The AC of described commutator is the AC of described rectification stage, using Y-connection, often mutually all using N number of H bridge Cascade structure, N is natural number；Described output filter adopts electric capacity mode filter, is connected in parallel on the direct current of each H bridge of commutator Side；
Described isolation level is made up of 3N mutually isostructural unit, and N is identical with the H bridge number of rectification stage；
Each unit includes primary structure, high-frequency isolation transformer, secondary structure three part composition, and described isolation level unit is once It is three port organizations that three H bridge topologys are formed with secondary structure；
Described isolation level primary side refers to the primary structure of all isolation level units；The secondary side of described isolation level refers to institute There is the secondary structure of isolation level unit；
The H bridge DC side of described isolation level unit primary structure and DC side parallel, AC and the high-frequency isolation of rectification stage H bridge Transformer primary side is connected；
H bridge 1 AC of described isolation level unit secondary structure is connected with high-frequency isolation transformer vice-side winding 1, described isolation The positive pole of the H bridge 1 DC side just extremely bipolarity dc bus of level unit secondary structure, negative pole is in bipolarity dc bus Line；H bridge 2 AC of described isolation level unit secondary structure is connected with high-frequency isolation transformer vice-side winding 2, described isolation level The center line of H bridge 2 DC side of unit secondary structure just extremely bipolarity dc bus, negative pole is the negative of bipolarity dc bus Pole；
The H bridge 1 of isolation level unit secondary structure and H bridge 2 DC side equal parallel connection direct electric capacity of voltage regulation, thus form bipolarity direct current Bus structure；
Described high-frequency isolation transformer is single primary side winding, two-pack side winding construction；
Described modularized design, refers to constitute a module by a H bridge of rectification stage and a unit of isolation level；
The AC of module is the AC of rectification stage H bridge, and the DC side of module is the double of isolation level unit secondary structure formation The positive pole of polarity DC bus, center line and negative pole；
The DC side of all modules is connected in parallel according to positive pole, center line, negative pole correspondence, forms core current transformer bipolar bus knot The DC side of structure；
Thus ultimately forming core converter structure proposed by the present invention.
2. according to claim 1 current transformer control method it is characterised in that：
The control targe of described current transformer rectification stage：Realize AC unit power factor rectifier；Rectification stage each H bridge DC side Capacitance voltage is equal to setting valueU dc_ref ；
The isolation level control targe of described current transformer：Realize energy in module isolation level primary structure and the secondary knot of module isolation level The isolation transmission of structure；Realize energy to transmit between two H bridges of module isolation level secondary structure；Bipolarity direct-current micro-grid positive pole is female Voltage between line and bipolarity direct-current micro-grid center lineU po , bipolarity direct-current micro-grid center line and bipolarity direct-current micro-grid negative electrode bus Between voltageU on Equal, and it is equal to setting value, that is,U po =U on =U line_ref ；
WhereinU line_ref Setting value for bipolarity direct-current micro-grid busbar voltage.
3. according to claim 2 current transformer control method it is characterised in that：The control of described rectification stage adopts following five Individual step：
（1）The angle of A phase voltage in pressure exchange distribution in acquisition
Three-phase voltage in pressure exchange distribution in Sample ACu a 、u b 、u c , by three phase static to the coordinate transform of biphase rotation, obtain Go out the voltage power-less component under two-phase rotating coordinate systemu q , transformation for mula is as shown in (1-3)：
(1-3)
Calculateu q Through PI controller, obtain rate correction amount Δω,This correction is added with 100 π, obtains current Angular velocityω s ,ω s (when this angle is more than 2 π, it is allowed to be 0, thus ensureing the angle information obtaining with 2 π Modulus of access after integration All in the range of 0 ~ 2 π), then by this angleθThe coordinate transform feeding back to formula (1-3) calculates in angle used, forms control Closed loop processed；
This angleθIt is the angle of A phase voltage in currently middle pressure exchange distribution 1；
（2）Decoupling AC side of converter input current
The electric current of described current transformer input line of samplingi as 、i bs 、i cs ；
By transformation for mula (1-4), three-phase current is changed into the watt current under rotating coordinate systemi d And reactive currenti q ；
Angle in formula adopts step（1）Middle acquisitionθValue；
(1-4)
（3）Control the electric current of AC side of converter input
Calculate each phase of current transformer A, B, C the 1st module respectively to the parallel filtering of module rectification stage H bridge DC side each in Nth module The voltage sum of electric capacityU dc_a_sum 、U dc_b_sum 、U dc_c_sum , ask for three's meansigma methodss afterwards and obtainU dc_ave_sum , N*U dc_ref DeductU dc_ave_sum After PI controller, obtain the set-point of current transformer rectification stage input current real componenti d_ref ；
Willi d_ref Deduct by step（2）The current transformer input watt current obtainingi d , obtain current transformer exchange after PI controller The real component of output voltagev d ；" 0 " deducts by step（2）The current transformer input reactive current obtainingi q , after PI controller Idle component to current transformer ac output voltagev q ；
By transformation for mula (1-5), obtain the three-phase voltage modulating wave of the required synthesis of AC side of converteru as 、u bs 、u cs ；
(1-5)
（4）Balance A, B, C each phase DC side total voltage in described current transformer rectification stage, realize described AC side of converter specific work Rate factor rectification
By N*U dc_ref Deduct the electricity of the parallel filtering electric capacity to module rectification stage H bridge DC side each in Nth module for A phase the 1st module Pressure sumU dc_a_sum , after PI controller, obtain A phase power back-off amountP ao；N*U dc_ref Deduct B phase the 1st module to N mould The voltage sum of the parallel filtering electric capacity of each module rectification stage H bridge DC side in blockU dc_b_sum , after PI controller, obtain B Phase power back-off amountP bo；
Using formula (1-6), formula (1-7) and formula (1-8)：
(1-6)
(1-7)
(1-8)
Trying to achieve modulating wave needs the residual voltage amplitude of injectionU 0And angleθ 0, thus obtaining the residual voltage injectingu 0 ；
Willu 0 With（3）Walk the modulating wave obtainingu as 、u bs 、u cs It is separately summed, obtain the required synthesis of current transformer rectification stage AC Three-phase voltage modulating wave correction waveformu as_c 、u bs_c 、u cs_c ；
Current transformer rectification stage output A, B, C three-phase exports respectivelyu as_c 、u bs_c 、u cs_c Voltage waveform, you can realize unit power Factor rectification；
（5）Module rectification stage dc-voltage balance controls
In described current transformer A phase, by the voltage setting value of module rectification stage parallel filtering electric capacityU dc_ref Deduct kth (k be integer, Span [1, N-1]) individual module rectification stage parallel filtering electric capacity voltageu a _ dc_k , after PI controller, obtain k-th The coefficient ε of module rectification stage AC output current modulating wave a_k , this amount is multiplied byu as_c / N obtains final current transformer A phase kth The modulating wave of individual module rectification stage AC outputu a_k_m ,u as_c By step（4）Obtain；Can get final change using formula (1-9) The modulating wave of stream device A phase n-th module rectification stage AC outputu a_N_m ；
Afterwards, by the way of SPWM, modulating wave is converted into the H bridge semiconductor device of pwm signal control module rectification stage, its In act on the triangular carrier angle mutual deviation π/N of each H bridge of A phase module rectification stage；
(1-9)
In the same manner, the modulating wave that current transformer B phase exports can be obtained with C phase each module rectification stage ACu b_x_m 、u c_x_m (x is whole here Number, span [1, N])；
It is achieved in module rectification stage DC voltage equal, and be equal to setting valueU dc_ref , that is, meet the electric capacity of each H bridge DC side Voltage is equal to setting value.
4. according to claim 2 current transformer control method it is characterised in that：
Module isolation level primary structure H bridge AC, the H bridge 1 of secondary structure and the AC output waveform of H bridge 2 are just Negative half period respectively accounts for 50% symmetrical alternating current square-wave voltage；
δ1For module isolation level primary structure H bridge AC voltageu 1With module isolation level secondary structure H bridge 1 AC voltageu 2 Between angle；
δ2For module isolation level primary structure H bridge AC voltageu 1With module isolation level secondary structure H bridge 2 ACu 3Between Angle；
Wherein δ1, δ2∈[-π/2,π/2]；Module isolation level high frequency transformer secondary 1 to the turn ratio of primary side winding isn 2, module every From level high frequency transformer secondary 2, the turn ratio of primary side winding is respectivelyn 3；u 2、u 3It is high frequency transformer secondary 1 voltageu 2' and high The voltage of frequency power transformer secondary 2u 3' convert the voltage after former limit, shown in convert formula such as formula (1-10)：
(1-10)
The control of described current transformer isolation level adopts phase shifting control, voltage, current double closed-loop；
The trigger pulse of all isolation level modules is identical；
Described isolation level controls using following five steps：
（1）Voltage loop controls
Bipolarity direct-current micro-grid busbar voltage setting valueU line _ ref Deduct the DC voltage of module isolation level secondary H bridge 1U po Afterwards, after PI controller, obtain the set-point of H bridge 1 DC side output currenti dc_28_ref ；Bipolarity direct-current micro-grid bus electricity Pressure setting valueU line _ ref Deduct the DC voltage of module isolation level secondary H bridge 2U on Afterwards, obtain H bridge 2 through PI controller straight The set-point of stream side output currenti dc_29_ref ；
（2）Current loop control
i dc_28_ref Deduct H bridge 1 DC side output currenti dc_28, the coupling phase shifting angle Δ δ of H bridge 1 is obtained through PI controller1；i dc_29_ref Deduct H bridge 2 DC side output currenti dc_29, the coupling phase shifting angle Δ δ of H bridge 1 is obtained through PI controller2；
（3）Uneoupled control is obtained with phase shifting angle
Δδ1With Δ δ2Decoupled through formula (1-11), obtained module isolation level secondary H bridge 1 and module isolation level secondary H bridge 2 The phase shifting angle δ of AC voltage waveform1、δ2, in decoupling matricesG 11、G 12、G 21、G 22Can by formula (1-12), (1-13), (1-14), (1-15) try to achieve；
Whereinf s Operating frequency for module isolation level high frequency transformer；L 1For high frequency transformer primary side winding leakage inductance,L 2For high frequency Transformer secondary 1 winding leakage inductance,L 3For high frequency transformer secondary 2 winding leakage inductance；
L 12For the equivalent conversion inductance between high frequency transformer primary side winding and secondary 1 winding,L 13For high frequency transformer former limit around Equivalent conversion inductance between group and secondary 2 winding,L 23For equivalent between high frequency transformer secondary 1 winding and secondary 2 winding Conversion inductance, shown in convert formula such as formula (1-16)；
(1-11)
(1-12)
(1-13)
(1-14)
(1-15)
(1-16)
According to phase shifting angle δ1、δ2Adjustment isolation level module secondary side H bridge 1 and the voltage of H bridge 2 AC, thus realize isolation level energy The transmission of amount is stablized with bipolarity direct-current micro-grid busbar voltage.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109767902A (en) * 2019-01-29 2019-05-17 河海大学 A kind of high-power high-frequency rotating electric electronic transformer
CN110649590A (en) * 2019-10-21 2020-01-03 上海电力大学 Networking type direct-current micro-grid energy cooperative control method
CN110729878A (en) * 2019-09-27 2020-01-24 西安交通大学 Power electronic transformer based on three-port high-frequency transformer and control method thereof
CN110829844A (en) * 2019-09-27 2020-02-21 西安交通大学 Modular low-voltage alternating current-direct current hybrid power electronic transformer topology and control method thereof
CN110829845A (en) * 2019-09-27 2020-02-21 西安交通大学 Power electronic transformer topology with power self-balancing capability and control method thereof
CN111345889A (en) * 2020-03-30 2020-06-30 四川锦江电子科技有限公司 Pulse generation circuit applied to pulsed electric field ablation technology and control method
WO2020178328A1 (en) 2019-03-04 2020-09-10 Katholieke Universiteit Leuven System and method for controlling the voltage of bipolar dc power systems
CN112187060A (en) * 2020-10-26 2021-01-05 国网江苏省电力有限公司电力科学研究院 Isolated low-voltage direct current switching circuit, switching device and control method
CN112564500A (en) * 2020-12-10 2021-03-26 北京科技大学 Control method and system for voltage support of three-active-bridge power electronic transformer
CN113644643A (en) * 2021-07-22 2021-11-12 许继集团有限公司 AC/DC hybrid microgrid interface converter and control method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1874127A (en) * 2005-06-01 2006-12-06 中国科学院电工研究所 Asymmetry type curent regulator, and ambipolar control method
CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
US20140218985A1 (en) * 2013-02-07 2014-08-07 Caterpillar Inc. Control of Energy Storage System Inverter System in a Microgrid Application
CN203827197U (en) * 2014-05-05 2014-09-10 国家电网公司 Modular H bridge cascaded multilevel mutually-balanced electric power electronic transformer
CN104641544A (en) * 2012-10-31 2015-05-20 法雷奥电机设备公司 Electricity supply system having double power-storage devices of a hybrid or electric motor vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1874127A (en) * 2005-06-01 2006-12-06 中国科学院电工研究所 Asymmetry type curent regulator, and ambipolar control method
CN104641544A (en) * 2012-10-31 2015-05-20 法雷奥电机设备公司 Electricity supply system having double power-storage devices of a hybrid or electric motor vehicle
US20140218985A1 (en) * 2013-02-07 2014-08-07 Caterpillar Inc. Control of Energy Storage System Inverter System in a Microgrid Application
CN103956911A (en) * 2014-05-05 2014-07-30 国家电网公司 Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
CN203827197U (en) * 2014-05-05 2014-09-10 国家电网公司 Modular H bridge cascaded multilevel mutually-balanced electric power electronic transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张国澎等: "多端口直流微电网实验平台设计", 《实验科学与技术》 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109767902A (en) * 2019-01-29 2019-05-17 河海大学 A kind of high-power high-frequency rotating electric electronic transformer
WO2020178328A1 (en) 2019-03-04 2020-09-10 Katholieke Universiteit Leuven System and method for controlling the voltage of bipolar dc power systems
US11962146B2 (en) 2019-03-04 2024-04-16 Katholieke Universiteit Leuven System and method for controlling the voltage of bipolar DC power systems
CN110729878A (en) * 2019-09-27 2020-01-24 西安交通大学 Power electronic transformer based on three-port high-frequency transformer and control method thereof
CN110829844A (en) * 2019-09-27 2020-02-21 西安交通大学 Modular low-voltage alternating current-direct current hybrid power electronic transformer topology and control method thereof
CN110829845A (en) * 2019-09-27 2020-02-21 西安交通大学 Power electronic transformer topology with power self-balancing capability and control method thereof
CN110649590A (en) * 2019-10-21 2020-01-03 上海电力大学 Networking type direct-current micro-grid energy cooperative control method
CN110649590B (en) * 2019-10-21 2023-12-12 上海电力大学 Energy cooperative control method for networking type direct-current micro-grid
CN111345889A (en) * 2020-03-30 2020-06-30 四川锦江电子科技有限公司 Pulse generation circuit applied to pulsed electric field ablation technology and control method
CN112187060A (en) * 2020-10-26 2021-01-05 国网江苏省电力有限公司电力科学研究院 Isolated low-voltage direct current switching circuit, switching device and control method
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CN113644643A (en) * 2021-07-22 2021-11-12 许继集团有限公司 AC/DC hybrid microgrid interface converter and control method

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