CN107612332A - The three Port Translation device systems applied to independent photovoltaic generating occasion - Google Patents
The three Port Translation device systems applied to independent photovoltaic generating occasion Download PDFInfo
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Abstract
The present invention relates to independent photovoltaic generation technology, for realize simultaneously large scale boosting, three ports altogether, the function of battery charging.And it is further proposed that control strategy corresponding to converter, makes TPC to be applied to independent photovoltaic generating system with safe and reliable.Therefore, the technical solution adopted by the present invention is, applied to three Port Translation device systems of independent photovoltaic generating occasion, it is made up of three parts：Buck (Buck boost) two-way DC converter, boosting (Boost) DC converter and switching capacity unit；In Buck boost two-way DC converters, Vpv、ipvThe respectively port voltage and port current of photovoltaic array, the output of photovoltaic array are applied to the parallel voltage-stabilizing electric capacity C of photovoltaic array as the input of the three Port Translations devicepvOn, S1With S2To concatenate switching tube.Present invention is mainly applied to independent photovoltaic generating occasion.
Description
Technical field
The present invention relates to the application scenario that independent photovoltaic generating system is combined with energy-storage units, more particularly to one kind are new
The corresponding control strategy of the non-isolated DC converter of high-gain.Concretely relate to be applied to independent photovoltaic generating occasion
Three Port Translation device systems.
Background technology
In recent years, with environmental pollution and the aggravation of problem of energy crisis, the new energy using solar energy, wind energy as representative is sent out
Power technology turns into study hotspot.When the intensity of illumination and temperature in the external world change, individually by photovoltaic (Photovoltaic, PV)
Unstable, discontinuous problem often be present in the electric energy output that array provides.Therefore, must match somebody with somebody in independent photovoltaic generating system
The energy-storage units such as standby battery store and adjusted electric energy, with requirement of the satisfaction electric loading to power supply continuity and stationarity.
Traditional PV-battery hybrid power systems need Unidirectional direct-current-direct current (DC-DC) converter connection photovoltaic array with
Load, a bidirectional DC-DC converter connection battery and load, system bulk and cost are larger, and control is relative complex.Using
One three Port Translation device (Three-Port Converter, TPC) replaces two individual transform devices, can realize input simultaneously
Energy management between source, energy-storage units and load, make independent photovoltaic generating system that there is more power density.
Whether isolated according to each port, TPC can be divided into full isolated form, half isolated form and non-isolation type.Isolated form TPC's
Each port is connected by high frequency transformer, and each port unit is made up of full-bridge converter or half-bridge converter.Isolated form TPC
Have many advantages, such as, the change of port voltage wide scope can be achieved, system effectiveness, but the quantity of switching tube are improved by soft switch technique
More, control strategy is complicated.
Compared with isolated form TPC, non-isolation type TPC has higher integrated level and power density.Therefore, do not needing electrically
In the application background of isolation, non-isolation type TPC helps to reduce system bulk.Nowadays, the research for non-isolation type TPC is present
Problems, such as：Topological boost capability is relatively low；Battery charge circuit can not be formed, and is not suitable for independent photovoltaic generating system；
Photovoltaic, battery, output port altogether, do not influence the stability of a system；It is competing that corresponding control strategy needs each controller to carry out
Strive, control is complicated, and battery can not be protected；Realize MPPT maximum power point tracking (Maximum Power in photovoltaic port
Point Tracking, MPPT) while do not ensure that output voltage is constant, constant pressure complexity demand can not be met.
The content of the invention
For overcome the deficiencies in the prior art, it is contemplated that the shortcomings that existing for non-isolation type TPC, propose a kind of new
Transformer configuration, can realize simultaneously large scale boosting, three ports altogether, battery charging function.And it is further proposed that become
Control strategy corresponding to parallel operation, TPC is set to be applied to independent photovoltaic generating system with safe and reliable.Therefore, the present invention uses
Technical scheme be, applied to three Port Translation device systems of independent photovoltaic generating occasion, to be made up of three parts：Buck
(Buck-boost) two-way DC converter, boosting (Boost) DC converter and switching capacity unit；It is double in Buck-boost
Into DC converter, Vpv、ipvThe respectively port voltage and port current of photovoltaic array, the output of photovoltaic array is used as should
The input of three Port Translation devices is applied to the parallel voltage-stabilizing electric capacity C of photovoltaic arraypvOn, S1With S2To concatenate switching tube, after concatenation
Exit point of two end points as Buck-boost two-way DC converters, S1With S2Pass through inductance L1Connect Buck-
The positive input terminal of boost two-way DC converters, pass through inductance L1Alternately store energy, release energy, realize bidirectional voltage boosting, drop
Pressure；In Boost DC converters, VB、iBThe respectively voltage and electric current of battery, battery is as Boost DC converters
Input, while as the output of Buck-boost two-way DC converters, CBIt is the parallel voltage-stabilizing electric capacity of battery, switching tube
S3With inductance L2After concatenation with CBBattery both ends are attempted by, pass through inductance L2Alternating storage energy, release energy, realize unidirectional
Boosting；Switching capacity unit is by diode D1、D2、D3With electric capacity C1、C2、C3Composition, V0、i0Respectively load voltage and load electricity
Stream, D1、D2、D3C2、C3It is sequentially connected in series, load resistance R is attempted by the C of concatenation2、C3Both ends, the D of concatenation1、D2With electric capacity C1And connect,
D1、D2Tie point and C2、C3Shorting stub is provided between tie point.
Switching tube S1、S2、S3There are four kinds of on off states：S1、S3Closure, S2The equivalent circuit diagram of disconnection；S2、S3Closure, S1It is disconnected
Open；S1Closure, S2、S3Disconnect；S2Closure, S1、S3Disconnect；
In S1A switch periods in, according to inductance L1Voltage-second balance relation, draw formula (1)：
<VL1>=ds1Vpv+(1-ds1)(Vpv-VB)=0 (1)
In formula (1), ds1For S1Dutycycle,<VL1>Represent in S1A cycle in, to inductance L1Voltage accumulated
Divide and calculate；
According to formula (1), V is drawnpvTo VBStep-up ratio：
S2、S3Closure, S1During disconnection, electric capacity C1With C3Voltage relationship such as formula (3) shown in：
Vc1=Vc3 (3)
In formula (3), Vc1For electric capacity C1Voltage, Vc3For electric capacity C3Voltage；
S1Closure, S2、S3During disconnection, electric capacity C1With C2Voltage relationship, electric capacity C2、C3With V0Voltage relationship such as formula (4),
(5) shown in：
Vc1=Vc2 (4)
Vc2+Vc3=V0 (5)
In formula (4), Vc2For electric capacity C2Voltage；
In S3A switch periods in, according to inductance L2Voltage-second balance relation, draw formula (6)：
<VL2>=ds3VB+(1-ds3)(VB-Vc3)=0 (6)
In formula 6, ds3For S3Dutycycle,<VL2>Represent in S3A cycle in, to inductance L2Voltage integrated
Calculate.
Bring formula (3)-(5) into formula (6), draw VBTo V0Step-up ratio：
Formula (2) is substituted into formula (7), draws VpvTo V0Step-up ratio：
Switchable pipe S1、S2、S3With diode D1、D2、D3Voltage stress be：
In formula (9), Vs1、Vs2Respectively switching tube S1、S2Voltage stress, in formula (9), Vs3For switching tube S3Voltage
Stress, VD1、VD2、VD3Respectively diode D1、D2、D3Voltage stress.
Three Port Translation device systems also include three controllers：For realizing MPPT maximum power point tracking MPPT (Maximum
Power Point Tracking) photovoltaic input voltage controller IVR (Input voltage regulator), based on electricity
Pond state-of-charge SOC (state of charge) photovoltaic input current controller IC R (Input current
Regulator), output voltage controller OVR (the Output voltage constant for realizing output loading voltage
Regulator), the equal adoption rate integral PI of controller (Proportional integral) controller controls, therefore, each
Input, the output of PI controllers are each corresponding controller IVR, ICR and OVR input and output；During system operation,
IVR and ICR only have one in working condition, and photovoltaic port is realized using perturbation observation method P＆O (perturb and observe)
MPPT maximum power point tracking, using current integration method realize storage battery charge state (State of charge, SOC) manage, be
Unite work when, battery is arranged to constant voltage mode CV (Constant voltage), input port voltage for photovoltaic array with
Port current, export as maximum power point of photovoltaic array reference voltage Vmppt, IVR input quantity is Vmppt、Vpv, IVR output
Measure as d2_IVR, d2_IVRIt is the dutycycle that controller IVR exports according to MPPT algorithm, the dutycycle is adjusted by pulse width
Make (Pulse Width Modulation, PWM) controlling switch pipe S1、S2Turn-on cycle；OVR input quantity is V0With output
Voltage reference value (V0_ref), OVR output quantity is d3, d3It is a dutycycle of controller OVR outputs, the dutycycle is finally led to
Cross PWM controlling switch pipes S3Turn-on cycle；ICR input quantity is ipv, photovoltaic current reference value (ipv_ref), wherein ipv_ref=
pref/Vpv, PrefFor the reference value of photovoltaic power, prefExpression formula it is as follows：
Pref=i0×V0 (11)
ICR output quantity is d2_ICR, d2_ICRIt is the dutycycle that controller IC R exports according to bearing power, the duty
Than passing through PWM controlling switch pipes S1、S2Turn-on cycle；According to battery SOC state, d2_IVR、d2_ICRPass through selecting module
(Mode selection) selects the numerical value of system needs therebetween, using the numerical value as final driving S1、S2Duty
Than i.e. d2。d2、d3Produce switching tube S respectively by PWM1、S2With S3Drive signal g1、g2With g3。
TPC system running patterns are determined jointly by intensity of illumination, ambient temperature, accumulator charging and discharging state and bearing power
It is fixed, in all operational modes, S3For controlling output voltage constant, when photovoltaic array absorption solar energy, realize that MPPT's is same
When, it must be limited by battery SOC states, and then battery is protected；
When photovoltaic port can not provide energy, i.e. Ppv=0, system is operated in single-input single-output SISO (Single
Input single output) pattern, battery individually powers to the load, i.e. PB=P0, S3For controlling output voltage constant,
Therefore d3=d3_OVR, S1、S2Close, i.e. d1=d2=0；
When photovoltaic port can provide energy, and can not individually meet load needs, i.e. P0＞ Ppv＞ 0, system work
DISO (Double input single output) pattern is exported in dual input list.Now need to be balanced the load with battery
With the energy gap between photovoltaic port, S1、S2For realizing MPPT, d1=d2=d2_IVR；
When photovoltaic port, which provides energy, is more than loading demand, i.e. Ppv＞ P0, the energy one of now photovoltaic port offer
Divide and be supplied to load, a part is stored into battery, and TPC systems are needed under the premise of storage battery safety work is ensured, effectively sharp
The energy provided with photovoltaic port, iB_MAXFor battery maximum charging and discharging currents, work as iB＜ iB_MAXAnd during SOC≤90%, system
Single-input double-output SIDO (Single input double output) pattern is operated in, system is equivalent to dual output conversion
Device, S1、S2For realizing MPPT, d1=d2=d2_IVR；
When system is operated under SIDO patterns, work as iB＞ iB_MAXOr during SOC ＞ 90%, system needs to carry out battery
Stream or the protection of maximum state-of-charge, photovoltaic port controller are forced to be switched to ICR from IVR, exit MPPT patterns, and battery stops
Charging.Operational mode is switched to SISO by SIDO, and photovoltaic port individually powers to the load.
The features of the present invention and beneficial effect are：
In the TPC systems of the present invention, in terms of topological structure：Each port can realize the stabilization for commonly, improving system
Property, and have higher voltage gain, meet higher voltage class in the application.In terms of control strategy：Control strategy letter
It is single, it is not necessary to which that each controller is at war with, and improves the stability of a system；SOC and overcurrent protection are carried out to battery, improve electric power storage
Pond service life；Battery port can effectively and rapidly balance the energy gap between photovoltaic port and load；Photovoltaic port
While realizing MPPT, load voltage can be kept constant.Therefore, TPC systems of the invention, are highly suitable to be applied for independent light
In photovoltaic generating system.
Brief description of the drawings：
Fig. 1 three-port DC converter topological structure schematic diagrames.
Fig. 2 S1、S3Closure, S2The equivalent circuit diagram of disconnection.
Fig. 3 S2、S3Closure, S1The equivalent circuit diagram of disconnection.
Fig. 4 S1Closure, S2、S3The equivalent circuit diagram of disconnection.
Fig. 5 S2Closure, S1、S3The equivalent circuit diagram of disconnection.
Fig. 6 TPC system operating mode schematic diagrames.
Fig. 7 TPC system control block figures.
Fig. 8 S1、S2Drive signal schematic diagram.
Fig. 9 DISO switch SIDO experimental waveform figures.
Figure 10 MPPT dynamic experiment oscillograms.
Embodiment
In order to solve problems of the prior art, Boost DC converter and switch electricity of the present invention based on classics
Hold structure, it is proposed that can realize large scale boosting, three ports altogether, battery have three Port Translation devices of charge circuit, and
And control strategy corresponding to converter is further provided, it is applied to independent photovoltaic generating system..
Three-port DC converter topological structure proposed by the present invention is as shown in figure 1, topological structure is made up of three parts：
Buck-boost two-way DC converters, Boost DC converters and switching capacity unit.Become in Buck-boost bidirectional, dcs
In parallel operation, Vpv、ipvThe respectively port voltage and port current of photovoltaic array, the output of photovoltaic array become as the calculation port
The input of parallel operation, CpvIt is the parallel voltage-stabilizing electric capacity of photovoltaic array, S1With S2For switching tube, pass through inductance L1Alternately store energy, release
Exoergic amount, realize bidirectional voltage boosting (Boost), decompression (Buck).In Boost DC converters, VB、iBRespectively battery
Voltage and electric current, input of the battery as Boost DC converters, while as Buck-boost two-way DC converters
Output, CBIt is the parallel voltage-stabilizing electric capacity of battery, S3For switching tube, pass through inductance L2Alternating storage energy, release energy, realize
Unidirectional boosting.Switching capacity unit is by diode D1、D2、D3With electric capacity C1、C2、C3Composition.R is load resistance, V0、i0Respectively
Load voltage and load current.
(2) voltage gain
According to switching tube S1、S2、S3On off state, TPC proposed by the invention shares four kinds of on off states：Fig. 2 is
S1、S3Closure, S2The equivalent circuit diagram of disconnection, Fig. 3 S2、S3Closure, S1The equivalent circuit diagram of disconnection, Fig. 4 S1Closure, S2、S3
The equivalent circuit diagram of disconnection, Fig. 5 S2Closure, S1、S3The equivalent circuit diagram of disconnection.
According to Fig. 2, Fig. 3, in S1A switch periods in, according to inductance L1Voltage-second balance relation, formula (1) can be drawn：
<VL1>=ds1Vpv+(1-ds1)(Vpv-VB)=0 (1)
In formula (1), ds1For S1Dutycycle,<VL1>Represent in S1A cycle in, to inductance L1Voltage accumulated
Divide and calculate.
According to formula (1), V can be drawnpvTo VBStep-up ratio：
According to Fig. 3, work as S3During closure, electric capacity C1With C3Voltage relationship such as formula (3) shown in：
Vc1=Vc3 (3)
In formula (3), Vc1For electric capacity C1Voltage, Vc3For electric capacity C3Voltage.
According to Fig. 4, when S3 disconnects, electric capacity C1With C2Voltage relationship, electric capacity C2、C3With V0Voltage relationship such as formula (4),
(5) shown in：
Vc1=Vc2 (4)
Vc2+Vc3=V0 (5)
In formula (4), Vc2For electric capacity C2Voltage.
According to Fig. 3, Fig. 4, in S3A switch periods in, according to inductance L2Voltage-second balance relation, formula (6) can be drawn：
<VL2>=ds3VB+(1-ds3)(VB-Vc3)=0 (6)
In formula 6, ds3For S3Dutycycle,<VL2>Represent in S3A cycle in, to inductance L2Voltage integrated
Calculate.
Bring formula (3)-(5) into formula (6), V can be drawnBTo V0Step-up ratio：
Formula (2) is substituted into formula (7), V can be drawnpvTo V0Step-up ratio：
According to Fig. 2, Fig. 3, Fig. 4, Fig. 5 and formula (3)-(6), switchable pipe S1、S2、S3With diode D1、D2、D3Voltage should
Power is：
In formula (9), Vs1、Vs2Respectively switching tube S1、S2Voltage stress.In formula (9), Vs3For switching tube S3Voltage
Stress, VD1、VD2、VD3Respectively diode D1、D2、D3Voltage stress.
(3) TPC mode of operations
In independent photovoltaic generating system, TPC system operating modes schematic diagram is shown in Fig. 6.In Fig. 6, PV Source,
Battery and load represents the energy of photovoltaic port, battery port and load port respectively.Arrow represents the side of energy flow
Method.
Single-input single-output (Single input single output, SISO) pattern：Fig. 6 (a) is that photovoltaic port is only
Stand to load and energy diagram is provided, the power P that now photovoltaic port providespvEqual to bearing power P0, i.e. Ppv=P0；Fig. 6 (b)
Energy diagram can not be provided for photovoltaic port, battery is independent to provide energy to load, the work(that now battery port provides
Rate PBEqual to P0, i.e. PB=P0。
Single-input double-output (Single input double output, SIDO) pattern：6 (c) be photovoltaic port simultaneously
Energy diagram is provided to battery and load, photovoltaic port provides energy to load, and the energy storage not run out of now arrives
Battery, i.e. Ppv=P0+PB。
Dual input list exports (Double input single output, DISO) pattern：6 (d) is photovoltaic port with storing
Battery provides energy diagram to load simultaneously, and the energy that now photovoltaic port provides can not meet loading demand, and battery is same
When power to the load, i.e. P0=PB+Ppv。
(4) control strategy
For TPC proposed by the present invention topologys, corresponding energy management strategies are devised, control block diagram is as shown in Figure 7.Control
Include three controllers altogether in method processed：For realizing MPPT photovoltaic input voltage controller (Input voltage
Regulator, IVR), the photovoltaic input current controller based on battery charge state (state of charge, SOC)
(Input current regulator, ICR), the output voltage controller (Output constant for realizing output loading voltage
Voltage regulator, OVR), controller is controlled using traditional proportional integration (Proportional integral, PI)
Device control processed, input, the output of each PI controllers are each corresponding controller IVR, ICR and OVR input and output.
During system operation, IVR and ICR only has one in working condition.Using perturbation observation method (perturb and observe, P＆O)
The MPPT maximum power point tracking of photovoltaic port is realized, realizes that battery SOC is managed using current integration method.When system works, electric power storage
Pond is arranged to constant voltage mode (Constant voltage, CV).In the figure 7, MPPT controller input is photovoltaic array
Port voltage and port current, MPPT controller output is maximum power point of photovoltaic array reference voltage (Vmppt),
IVR input quantity is Vmppt、Vpv, IVR output quantity is d2_IVR, d2_IVRIt is one that controller IVR exports according to MPPT algorithm
Dutycycle, the dutycycle pass through pulse width modulation (Pulse Width Modulation, PWM) controlling switch pipe S1、S2Lead
The logical cycle；OVR input quantity is V0With output voltage reference value (V0_ref), OVR output quantity is d3, d3It is controller OVR outputs
A dutycycle, the dutycycle is eventually through PWM controlling switch pipes S3Turn-on cycle；ICR input quantity is ipv, photovoltaic electric
Flow reference value (ipv_ref), wherein ipv_ref=pref/Vpv, PrefFor the reference value of photovoltaic power, prefExpression formula it is as follows：According to
Fig. 7, ICR input quantity are ipv、ipv_ref, wherein ipv_ref=pref/Vpv, prefExpression formula it is as follows：
Pref=i0×V0 (11)
ICR output quantity is d2_ICR。d2_ICRIt is the dutycycle that controller IC R exports according to bearing power, the duty
Than passing through PWM controlling switch pipes S1、S2Turn-on cycle；According to battery SOC state, d2_IVR、d2_ICRPass through selecting module
(Mode selection) selects the numerical value of system needs therebetween, using the numerical value as final driving S1、S2Duty
Than i.e. d2。d2、d3Produce switching tube S respectively by PWM1、S2With S3Drive signal g1、g2With g3。
TPC system running patterns are determined jointly by intensity of illumination, ambient temperature, accumulator charging and discharging state and bearing power
It is fixed.In all operational modes, S3For controlling output voltage constant.When photovoltaic array absorption solar energy, realize that MPPT's is same
When, it must be limited by battery SOC states, and then battery is protected.
When photovoltaic port can not provide energy, i.e. Ppv=0, system is operated in SISO patterns, and battery is individually to load
Power supply, i.e. PB=P0。S3For controlling output voltage constant, therefore d3=d3_OVR。S1、S2Close, i.e. d1=d2=0.
When photovoltaic port can provide energy, and can not individually meet load needs, i.e. P0＞ Ppv＞ 0, system work
In DISO patterns.Now need with battery the energy gap that balances the load between photovoltaic port.S1、S2For realizing
MPPT, d1=d2=d2_IVR。
When photovoltaic port, which provides energy, is more than loading demand, i.e. Ppv＞ P0, the energy one of now photovoltaic port offer
Divide and be supplied to load, a part is stored into battery, and TPC systems are needed under the premise of storage battery safety work is ensured, effectively sharp
The energy provided with photovoltaic port.iB_MAXFor battery maximum charging and discharging currents, work as iB＜ iB_MAXAnd during SOC≤90%, system
SIDO patterns are operated in, system is equivalent to dual-output converter, S1、S2For realizing MPPT, d1=d2=d2_IVR。
When system is operated under SIDO patterns, work as iB＞ iB_MAXOr during SOC ＞ 90%, system needs to carry out battery
Stream or the protection of maximum state-of-charge, photovoltaic port controller are forced to be switched to ICR from IVR, exit MPPT patterns, and battery stops
Charging.Operational mode is switched to SISO by SIDO, and photovoltaic port individually powers to the load.
G in Fig. 71、g2、g3For S1、S2、S3Drive signal, d2、d3For g2、g3Dutycycle.S1、S2、S3Drive signal
It is pulsewidth modulation (Pulse width modulation, PWM) signal.Wherein, S1、S2Drive signal it is complementary for one group
Pwm signal, as shown in figure 8, v in Fig. 8triFor sawtooth carrier wave, VTFor carrier wave maximum.
Based on the control strategy and modulator approach that are respectively shown in below by Fig. 1 TPC topological structures and Fig. 7, Fig. 8, lead to
Experiment is crossed to illustrate the preferred forms of the present invention.
Fig. 9 is that TPC systems export DISO (Double input single output) and single input list in dual input list
The experimental waveform switched between output (Single input single output, SISO) pattern.ipvDuring=10A, Ppv=
240W, battery back discharge, TPC are operated in DISO patterns；ipvDuring=20A, Ppv=480W, battery positive charge, TPC
It is operated in SIDO patterns.It can be seen that during pattern switching, output voltage V0Stabilization is in 400V；Work as PpvChange
During change, battery can be in DISO and SIDO with the energy gap between Fast-Balance photovoltaic port and load port, system
Switch between pattern.Meanwhile photovoltaic port voltage Vpv=24V is boosted by TPC, can be stablized in 400V.
When photovoltaic array is operated in MPPT, with the change of extraneous intensity of illumination and temperature, the output voltage of photovoltaic array
It can change therewith.Therefore, in Fig. 10, VpvDuring 20V increases to 28V, PpvIncrease therewith, iBIt is corresponding drop to from 1A-
1.3A, i.e., it is changed into reverse charging from forward direction electric discharge.In dynamic process, V0=400V is constant.Experimental verification TPC systems are in reality
While existing MPPT, output voltage V0It can keep constant.
In summary, TPC systems of the invention, can apply in independent photovoltaic generating system.High voltage can be realized
Gain, large scale boosting is carried out to relatively low photovoltaic input voltage, meets loading demand.Photovoltaic port provides energy to load
Meanwhile battery can reliably, quickly supplement energy gap.
Claims (4)
1. a kind of three Port Translation device systems applied to independent photovoltaic generating occasion, it is characterized in that, it is made up of three parts：Lifting
Press (Buck-boost) two-way DC converter, boosting (Boost) DC converter and switching capacity unit；In Buck-boost
In two-way DC converter, Vpv、ipvThe respectively port voltage and port current of photovoltaic array, the output conduct of photovoltaic array
The input of the three Port Translations device is applied to the parallel voltage-stabilizing electric capacity C of photovoltaic arraypvOn, S1With S2To concatenate switching tube, concatenation
Exit point of two end points as Buck-boost two-way DC converters afterwards, S1With S2Pass through inductance L1Connect Buck-
The positive input terminal of boost two-way DC converters, pass through inductance L1Alternately store energy, release energy, realize bidirectional voltage boosting, drop
Pressure；In Boost DC converters, VB、iBThe respectively voltage and electric current of battery, battery is as Boost DC converters
Input, while as the output of Buck-boost two-way DC converters, CBIt is the parallel voltage-stabilizing electric capacity of battery, switching tube
S3With inductance L2After concatenation with CBBattery both ends are attempted by, pass through inductance L2Alternating storage energy, release energy, realize unidirectional
Boosting；Switching capacity unit is by diode D1、D2、D3With electric capacity C1、C2、C3Composition, V0、i0Respectively load voltage and load electricity
Stream, D1、D2、D3C2、C3It is sequentially connected in series, load resistance R is attempted by the C of concatenation2、C3Both ends, the D of concatenation1、D2With electric capacity C1And connect,
D1、D2Tie point and C2、C3Shorting stub is provided between tie point.
2. it is applied to three Port Translation device systems of independent photovoltaic generating occasion as claimed in claim 1, it is characterized in that, switch
Pipe S1、S2、S3There are four kinds of on off states：S1、S3Closure, S2Disconnect；S2、S3Closure, S1Disconnect；S1Closure, S2、S3Disconnect；S2Close
Close, S1、S3Disconnect；
In S1A switch periods in, according to inductance L1Voltage-second balance relation, draw formula (1)：
<VL1>=ds1Vpv+(1-ds1)(Vpv-VB)=0 (1)
In formula (1), ds1For S1Dutycycle,<VL1>Represent in S1A cycle in, to inductance L1Voltage carry out integrating meter
Calculate；
According to formula (1), V is drawnpvTo VBStep-up ratio：
<mrow>
<msub>
<mi>V</mi>
<mi>B</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mn>1</mn>
<mo>-</mo>
<msub>
<mi>d</mi>
<mrow>
<mi>s</mi>
<mn>1</mn>
</mrow>
</msub>
</mrow>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>p</mi>
<mi>v</mi>
</mrow>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
S2、S3Closure, S1During disconnection, electric capacity C1With C3Voltage relationship such as formula (3) shown in：
Vc1=Vc3 (3)
In formula (3), Vc1For electric capacity C1Voltage, Vc3For electric capacity C3Voltage；
S1Closure, S2、S3During disconnection, electric capacity C1With C2Voltage relationship, electric capacity C2、C3With V0Voltage relationship such as formula (4), (5) institute
Show：
Vc1=Vc2 (4)
Vc2+Vc3=V0 (5)
In formula (4), Vc2For electric capacity C2Voltage；
In S3A switch periods in, according to inductance L2Voltage-second balance relation, draw formula (6)：
<VL2>=ds3VB+(1-ds3)(VB-Vc3)=0 (6)
In formula 6, ds3For S3Dutycycle,<VL2>Represent in S3A cycle in, to inductance L2Voltage carry out integral and calculating.
Bring formula (3)-(5) into formula (6), draw VBTo V0Step-up ratio：
<mrow>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<mn>2</mn>
<mrow>
<mn>1</mn>
<mo>-</mo>
<msub>
<mi>d</mi>
<mrow>
<mi>s</mi>
<mn>3</mn>
</mrow>
</msub>
</mrow>
</mfrac>
<msub>
<mi>V</mi>
<mi>B</mi>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>7</mn>
<mo>)</mo>
</mrow>
</mrow>
Formula (2) is substituted into formula (7), draws VpvTo V0Step-up ratio：
<mrow>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<mn>2</mn>
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<mo>-</mo>
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<mn>1</mn>
</mrow>
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<mo>)</mo>
<mo>(</mo>
<mn>1</mn>
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<mi>d</mi>
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<mi>s</mi>
<mn>3</mn>
</mrow>
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<mo>)</mo>
</mrow>
</mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>p</mi>
<mi>v</mi>
</mrow>
</msub>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>8</mn>
<mo>)</mo>
</mrow>
</mrow>
Switchable pipe S1、S2、S3With diode D1、D2、D3Voltage stress be：
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<mi>V</mi>
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<mi>S</mi>
<mn>1</mn>
</mrow>
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<mo>=</mo>
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<mn>2</mn>
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<mo>=</mo>
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<mo>=</mo>
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<mn>1</mn>
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</mrow>
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<mn>2</mn>
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<mn>0</mn>
</msub>
<mo>-</mo>
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<mo>-</mo>
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<mo>(</mo>
<mn>9</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>V</mi>
<mrow>
<mi>S</mi>
<mn>3</mn>
</mrow>
</msub>
<mo>=</mo>
<msub>
<mi>V</mi>
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<mi>D</mi>
<mn>1</mn>
</mrow>
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<mi>D</mi>
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<mi>V</mi>
<mn>0</mn>
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<mo>-</mo>
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<mn>10</mn>
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In formula (9), Vs1、Vs2Respectively switching tube S1、S2Voltage stress, in formula (9), Vs3For switching tube S3Voltage should
Power, VD1、VD2、VD3Respectively diode D1、D2、D3Voltage stress.
3. it is applied to three Port Translation device systems of independent photovoltaic generating occasion as claimed in claim 1, it is characterized in that, three ends
Mouth changer system also includes three controllers：For realizing MPPT maximum power point tracking MPPT (Maximum Power Point
Tracking photovoltaic input voltage controller IVR (Input voltage regulator)), based on battery charge state SOC
The photovoltaic input current controller IC R (Input current regulator) of (state of charge), it is defeated for realizing
Go out the constant output voltage controller OVR of load voltage (Output voltage regulator), the equal adoption rate of controller
Integral PI (Proportional integral) controller controls, and therefore, input, the output of each PI controllers are respective
Corresponding controller IVR, ICR and OVR input and output；During system operation, IVR and ICR only have one in working condition, should
The MPPT maximum power point tracking of photovoltaic port is realized with perturbation observation method P＆O (perturb and observe), is integrated using ampere-hour
Method realizes that storage battery charge state (State of charge, SOC) manages, and when system works, battery is arranged to constant voltage mode
CV (Constant voltage), inputs the port voltage and port current for photovoltaic array, exports as photovoltaic array maximum work
Rate point reference voltage Vmppt, IVR input quantity is Vmppt、Vpv, IVR output quantity is d2_IVR, d2_IVRController IVR according to
One dutycycle of MPPT algorithm output, the dutycycle pass through pulse width modulation (Pulse Width Modulation, PWM)
Controlling switch pipe S1、S2Turn-on cycle；OVR input quantity is V0With output voltage reference value (V0_ref), OVR output quantity is
d3, d3It is a dutycycle of controller OVR outputs, the dutycycle is eventually through PWM controlling switch pipes S3Turn-on cycle；ICR
Input quantity be ipv, photovoltaic current reference value (ipv_ref), wherein ipv_ref=pref/Vpv, PrefFor the reference value of photovoltaic power,
prefExpression formula it is as follows：
Pref=i0×V0 (11)
ICR output quantity is d2_ICR, d2_ICRIt is the dutycycle that controller IC R exports according to bearing power, the dutycycle is led to
Cross PWM controlling switch pipes S1、S2Turn-on cycle；According to battery SOC state, d2_IVR、d2_ICRPass through selecting module (Mode
Selection the numerical value of system needs) is selected therebetween, using the numerical value as final driving S1、S2Dutycycle, i.e.,
d2。d2、d3Produce switching tube S respectively by PWM1、S2With S3Drive signal g1、g2With g3。
4. it is applied to three Port Translation device systems of independent photovoltaic generating occasion as claimed in claim 1, it is characterized in that, TPC
System running pattern is together decided on by intensity of illumination, ambient temperature, accumulator charging and discharging state and bearing power, in all fortune
In row mode, S3,, must be by while realizing MPPT when photovoltaic array absorbs solar energy for controlling output voltage constant
The limitation of battery SOC states, and then battery is protected；
When photovoltaic port can not provide energy, i.e. Ppv=0, system is operated in single-input single-output SISO (Single input
Single output) pattern, battery individually powers to the load, i.e. PB=P0, S3For controlling output voltage constant, therefore d3
=d3_OVR, S1、S2Close, i.e. d1=d2=0；
When photovoltaic port can provide energy, and can not individually meet load needs, i.e. P0＞ Ppv＞ 0, system are operated in double
Single output DISO (the Double input single output) pattern of input.Now need to be balanced the load and light with battery
Lie prostrate the energy gap between port, S1、S2For realizing MPPT, d1=d2=d2_IVR；
When photovoltaic port, which provides energy, is more than loading demand, i.e. Ppv＞ P0, now photovoltaic port provide an energy part carry
Supply load, a part are stored into battery, and TPC systems are needed under the premise of storage battery safety work is ensured, effectively utilize light
Lie prostrate the energy that port provides, iB_MAXFor battery maximum charging and discharging currents, work as iB＜ iB_MAXAnd during SOC≤90%, system work
In single-input double-output SIDO (Single input double output) pattern, system is equivalent to dual-output converter, S1、
S2For realizing MPPT, d1=d2=d2_IVR；
When system is operated under SIDO patterns, work as iB＞ iB_MAXOr during SOC ＞ 90%, system need to battery carry out excessively stream or
Maximum state-of-charge protection, photovoltaic port controller are forced to be switched to ICR from IVR, exit MPPT patterns, and battery stops filling
Electricity.Operational mode is switched to SISO by SIDO, and photovoltaic port individually powers to the load.
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| CN108809096A (en) * | 2018-06-08 | 2018-11-13 | 西安空间无线电技术研究所 | A kind of square high gain boost/buck-boost converter for wide bus ranges |
| CN109149550A (en) * | 2018-09-01 | 2019-01-04 | 哈尔滨工程大学 | A method of the transmission of distribution by stages electric energy is realized with three Port Translation devices for regulation node |
| CN110138217A (en) * | 2019-06-19 | 2019-08-16 | 河北科技大学 | Three port DC-DC converters of one kind and its control method |
| CN110212842A (en) * | 2019-06-06 | 2019-09-06 | 南通大学 | A kind of three port integrated form converters and control method for photovoltaic energy storage system |
| CN110380403A (en) * | 2019-07-09 | 2019-10-25 | 闽江学院 | A kind of direct-current grid multi-mode transition control method based on network delay compensation |
| CN112467990A (en) * | 2020-11-12 | 2021-03-09 | 东南大学 | Direct-current power spring topology based on three-active-bridge converter and control method |
| CN113113963A (en) * | 2021-03-11 | 2021-07-13 | 三峡大学 | Digital iron tower on-line monitoring device multi-source self-power supply system based on three-port commutation |
| CN114337249A (en) * | 2021-11-22 | 2022-04-12 | 南京理工大学 | Three-port DC-DC converter based on quasi-Z source and switch capacitor and competition control method |
| CN114825930A (en) * | 2022-03-25 | 2022-07-29 | 深圳信息职业技术学院 | Three-port converter suitable for satellite power supply double-bus architecture and control method |
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| CN108809096A (en) * | 2018-06-08 | 2018-11-13 | 西安空间无线电技术研究所 | A kind of square high gain boost/buck-boost converter for wide bus ranges |
| CN109149550A (en) * | 2018-09-01 | 2019-01-04 | 哈尔滨工程大学 | A method of the transmission of distribution by stages electric energy is realized with three Port Translation devices for regulation node |
| CN109149550B (en) * | 2018-09-01 | 2021-07-13 | 哈尔滨工程大学 | Method for realizing power distribution partition electric energy transmission by taking three-port converter as regulation node |
| CN110212842A (en) * | 2019-06-06 | 2019-09-06 | 南通大学 | A kind of three port integrated form converters and control method for photovoltaic energy storage system |
| CN110138217A (en) * | 2019-06-19 | 2019-08-16 | 河北科技大学 | Three port DC-DC converters of one kind and its control method |
| CN110380403A (en) * | 2019-07-09 | 2019-10-25 | 闽江学院 | A kind of direct-current grid multi-mode transition control method based on network delay compensation |
| CN112467990A (en) * | 2020-11-12 | 2021-03-09 | 东南大学 | Direct-current power spring topology based on three-active-bridge converter and control method |
| CN112467990B (en) * | 2020-11-12 | 2022-05-31 | 东南大学 | Direct-current power spring topology based on three-active-bridge converter and control method |
| CN113113963A (en) * | 2021-03-11 | 2021-07-13 | 三峡大学 | Digital iron tower on-line monitoring device multi-source self-power supply system based on three-port commutation |
| CN114337249A (en) * | 2021-11-22 | 2022-04-12 | 南京理工大学 | Three-port DC-DC converter based on quasi-Z source and switch capacitor and competition control method |
| CN114337249B (en) * | 2021-11-22 | 2024-04-23 | 南京理工大学 | Three-port DC-DC converter based on quasi-Z source and switched capacitor and competition control method |
| CN114825930A (en) * | 2022-03-25 | 2022-07-29 | 深圳信息职业技术学院 | Three-port converter suitable for satellite power supply double-bus architecture and control method |
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