CN105186899B - A kind of T-shaped three-level three-phase energy storage inverter system - Google Patents
A kind of T-shaped three-level three-phase energy storage inverter system Download PDFInfo
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Abstract
The invention discloses a kind of T-shaped three-level three-phase energy storage inverter system, including：Lithium battery group, energy in bidirectional flow DC dc converter, DC dc converter controller, energy in bidirectional flow direct-current-alternating-current converter and direct-current-alternating-current converter controller；Wherein：Lithium battery group is connected with energy in bidirectional flow DC dc converter；DC dc converter is connected with energy in bidirectional flow direct-current-alternating-current converter；Energy in bidirectional flow direct-current-alternating-current converter is connected with power network；DC dc converter controller is connected with energy in bidirectional flow DC dc converter；Direct-current-alternating-current converter controller is connected with energy in bidirectional flow direct-current-alternating-current converter.The present invention can reduce the cost of system, while realize the two-way flow of energy.
Description
Technical field
The present invention relates to distributed generation technology field, more particularly to a kind of T-shaped three-level three-phase energy storage inverter system.
Background technology
In recent years, as energy resource consumption increases year by year, conventional energy resource increasingly depleted, renewable energy power generation (wind-power electricity generation,
Photovoltaic generation etc.) increasingly paid close attention to by people are obtained.Energy storage inverter system need to pass through energy storage as the indispensable part of power network
Inverter is connected with network system, plays a part of balancing and buffering power network internal energy.Therefore, how energy storage inverter is passed through
The two-way flow of energy is realized, while it is a urgent problem to be solved to reduce application cost.
The content of the invention
The invention provides a kind of T-shaped three-level three-phase energy storage inverter system, the cost of system can be reduced, at the same it is real
The two-way flow of existing energy.
The invention provides a kind of T-shaped three-level three-phase energy storage inverter system, including：Lithium battery group, energy bidirectional flow
Dynamic DC-DC converter, DC-DC converter controller, energy in bidirectional flow direct-current-alternating-current converter and direct current-friendship
Current converter controller；Wherein：
The lithium battery group is connected with the energy in bidirectional flow DC-DC converter；
The DC-DC converter is connected with the energy in bidirectional flow direct-current-alternating-current converter；
The energy in bidirectional flow direct-current-alternating-current converter is connected with power network；
The DC-DC converter controller is connected with the energy in bidirectional flow DC-DC converter；
The direct-current-alternating-current converter controller is connected with the energy in bidirectional flow direct-current-alternating-current converter.
Preferably, the energy in bidirectional flow DC-DC converter includes：High frequency low voltage switch mosfet pipe S1, height
Frequency low pressure switch mosfet pipe S2, high frequency low voltage switch mosfet pipe S3, high frequency low voltage switch mosfet pipe S4, high frequency boosting become
Depressor T1, filter inductance L1, high pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube Sd3, high pressure
IGBT switching tubes Sd4, DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4；Wherein：
The high frequency low voltage switch mosfet pipe S1, high frequency low voltage switch mosfet pipe S2, high frequency low voltage switch mosfet
Pipe S3, high frequency low voltage switch mosfet pipe S4 form H4 bridges；
The high pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube Sd3 and high pressure IGBT are opened
Close pipe Sd4 and form a bridge arm of T-shaped three level as converter secondary in energy in bidirectional flow DC-DC converter, institute
Another bridge arm for stating converter secondary is DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4 neutral points.
Preferably, the energy in bidirectional flow direct-current-alternating-current converter includes：T-shaped three-level three-phase three-leg inverter,
Filter inductance L2 and filter capacitor C3；Wherein：
The T-shaped three-level three-phase three-leg inverter is made up of three bridge arms, and first bridge arm is by power high pressure IGBT
Switching tube Sa1, power high pressure IGBT switching tube Sa2, power high pressure IGBT switching tube Sa3 and power high pressure IGBT switching tube Sa4
Form, second bridge arm is switched by power high pressure IGBT switching tube Sb1, power high pressure IGBT switching tube Sb2, power high pressure IGBT
Pipe Sb3 and power high pressure IGBT switching tube Sb4 is formed, and the 3rd bridge arm is by power high pressure IGBT switching tube Sc1 and power high pressure
IGBT switching tubes Sc4 is formed.
Preferably, the drive signal of the power high pressure IGBT switching tube Sa1 and power high pressure IGBT switching tube Sa3 drive
Dynamic signal is complementary, while sets 2us dead times, power high pressure IGBT switching tube Sa2 drive signal and power high pressure IGBT
Switching tube Sa4 drive signal is complementary, while sets 2us dead times；Power high pressure IGBT switching tube Sb1 drive signal and
Power high pressure IGBT switching tube Sb3 drive signal is complementary, while sets 2us dead times, power high pressure IGBT switching tube Sb2
Drive signal and power high pressure IGBT switching tube Sb4 drive signal it is complementary, while 2us dead times are set；Power high pressure
IGBT switching tubes Sc1 drive signal and power high pressure IGBT switching tube Sc4 drive signal are complementary, while set 2us dead bands
Time.
Preferably, the direct-current-alternating-current converter controller includes：Limited on off state forecast model and proportional integration control
Device processed.
Preferably, the object function of the limited on off state forecast model is：
Wherein, iα(k)、iβ(k) for T-shaped three-level three-phase energy storage inverter system output current under α β rest frames
α, β component, λvIt is the weight coefficient of object function, VP(k+1) it is direct current positive bus voltage, VN(k+1) it is direct current negative busbar electricity
Pressure,Electric current is given for α axles under rest frame,Electric current is given for β axles under rest frame.
Preferably, the DC-DC converter controller includes PI controllers.
From such scheme, a kind of T-shaped three-level three-phase energy storage inverter system provided by the invention, by direct current-
Control of the DC converter controller to energy in bidirectional flow DC-DC converter, and pass through direct-current-alternating-current converter control
Control of the device processed to energy in bidirectional flow direct-current-alternating-current converter, can realize the two-way flow of energy, while reduce system
Cost.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of T-shaped three-level three-phase energy storage inverter system disclosed in the embodiment of the present invention；
Fig. 2 is a kind of topological circuit figure of T-shaped three-level three-phase energy storage inverter system disclosed in the embodiment of the present invention；
Fig. 3 is the voltage vector-diagram of T-shaped three-level three-phase energy storage inverter disclosed in the embodiment of the present invention；
Fig. 4 is a kind of limited on off state of energy in bidirectional flow direct-current-alternating-current converter disclosed in the embodiment of the present invention
Model Predictive Control policy map；
Fig. 5 is a kind of energy in bidirectional flow DC-DC converter control strategy figure disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As shown in figure 1, be a kind of T-shaped three-level three-phase energy storage inverter system disclosed in the embodiment of the present invention, including：Lithium
Battery pack 11, energy in bidirectional flow DC-DC converter 12, DC-DC converter controller 13, energy in bidirectional flow are straight
Stream-AC converter 14 and direct-current-alternating-current converter controller 15；Wherein：
Lithium battery group 11 is connected with energy in bidirectional flow DC-DC converter 12；
DC-DC converter 12 is connected with energy in bidirectional flow direct-current-alternating-current converter 14；
Energy in bidirectional flow direct-current-alternating-current converter 14 is connected with power network 10；
DC-DC converter controller 13 is connected with energy in bidirectional flow DC-DC converter 12；
Direct-current-alternating-current converter controller 15 is connected with energy in bidirectional flow direct-current-alternating-current converter 14.
Specifically, as shown in Fig. 2 energy in bidirectional flow DC-DC converter includes：High frequency low voltage switch mosfet pipe
S1, high frequency low voltage switch mosfet pipe S2, high frequency low voltage switch mosfet pipe S3, high frequency low voltage switch mosfet pipe S4, high frequency
Step-up transformer T1, filter inductance L1, high pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube
Sd3, high pressure IGBT switching tube Sd4, DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4；Wherein：
High frequency low voltage switch mosfet pipe S1, high frequency low voltage switch mosfet pipe S2, high frequency low voltage switch mosfet pipe S3,
High frequency low voltage switch mosfet pipe S4 forms H4 bridges；
High pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube Sd3 and high pressure IGBT switching tube
Sd4 forms a bridge arm of T-shaped three level as converter secondary in energy in bidirectional flow DC-DC converter, converter
Another bridge arm of secondary is DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4 neutral points.
Energy in bidirectional flow direct-current-alternating-current converter includes：T-shaped three-level three-phase three-leg inverter, filter inductance L2
With filter capacitor C3；Wherein：
T-shaped three-level three-phase three-leg inverter is made up of three bridge arms, and first bridge arm is switched by power high pressure IGBT
Pipe Sa1, power high pressure IGBT switching tube Sa2, power high pressure IGBT switching tube Sa3 and power high pressure IGBT switching tube Sa4 are formed,
Second bridge arm is by power high pressure IGBT switching tube Sb1, power high pressure IGBT switching tube Sb2, power high pressure IGBT switching tube Sb3
Formed with power high pressure IGBT switching tube Sb4, the 3rd bridge arm is opened by power high pressure IGBT switching tube Sc1 and power high pressure IGBT
Pipe Sc4 is closed to form.T-shaped each bridge arm of three-level three-phase inverter of tradition is made up of 4 power switch pipes, altogether by 12 work(
Rate switching tube is formed.And invent the T-shaped three-level three-phase three-leg inverter of low cost and there was only 10 power switch pipes, power is opened
Closing pipe reduces 1/6, reduces cost.
Specifically, power high pressure IGBT switching tube Sa1 drive signal and power high pressure IGBT switching tube in the present invention
Sa3 drive signal is complementary, while sets 2us dead times, and power high pressure IGBT switching tube Sa2 drive signal and power is high
Press IGBT switching tubes Sa4 drive signal complementary, while 2us dead times are set；Power high pressure IGBT switching tube Sb1 driving
Signal and power high pressure IGBT switching tube Sb3 drive signal are complementary, while set 2us dead times, and power high pressure IGBT is opened
The drive signal complementation of pipe Sb2 drive signal and power high pressure IGBT switching tube Sb4 is closed, while 2us dead times are set；Work(
Rate high pressure IGBT switching tube Sc1 drive signal and power high pressure IGBT switching tube Sc4 drive signal are complementary, set simultaneously
2us dead times.
Specifically, in the T-shaped three-level three-phase energy storage inversion system of low cost in DC-AC inverter circuit, per phase bridge
Arm has three kinds of output states：" P " state, " O " state and " N " state.Using three-level three-phase inverter neutral point voltage o as reference
Voltage, then inverter output phase voltage is respectively Vdc/ 2,0 and-Vdc/2.In order to facilitate modeling, it is assumed that all switching components are all
It is ideal component, ignores dead time, inverter output end is connected by filter inductance L2 with power network, the neutral point of three phase network
For n, then inexpensive T-shaped three-level three-phase energy storage inversion can be equivalent to corresponding switch models.It is assumed that variable Sa, Sb, Sc1,
0, -1 } represent the on off state of each phase, wherein " 1 " represent output be connected with busbar voltage positive pole P points, " 0 " represent output and
0 point of busbar voltage neutral point is connected, and " -1 " represents output and is connected with busbar voltage negative pole N points.The T-shaped three-level three-phase storage of low cost
The on off state that DC-AC inverter exports in energy inversion system can be expressed as：
Sj=[Sa Sb Sc]T (1)
Wherein j=0 ..., 17.
Then DC-AC inverter output voltage voltage under static α β coordinate systems is expressed as：
Wherein Τ3/2It is three phase static coordinate to two-phase rest frame transformation matrix, is represented by：
In Fig. 2, ea、eb、ebRespectively three phase network phase voltage；ia、ib、icRespectively three-phase grid-connected inverter output is mutually electric
Stream；ua、ub、ucRespectively three-phase grid-connected inverter output phase voltage；C2, C4 are respectively dc-link capacitance；VP、VNIt is respectively electric
Hold C2 and C4 voltages；Vdc=Vp+VnFor DC bus-bar voltage；L2 and C4 is the filter inductance and filtered electrical of three-phase energy storage inverter
Hold.
In a system of the invention, rated power can be set as 5KW, the voltage range of lithium battery group is 100V -130V, lithium
Battery pack filter capacitor C1=1000uF, high frequency transformer T1 switching frequency are 40k, and high frequency transformer no-load voltage ratio is 1：6, high frequency
Transformer filter inductance L1=0.1mH, dc-link capacitance C2=C3=1000uF, it is 220V that power network, which is mutually pressed with valid value, direct current-
AC inverter filter inductance L2=0.8mH, filter capacitor C4=4.7uF, the switching frequency of DC-AC inverter is 20k.
According to Fig. 2, the DC-AC inverter in the T-shaped three-level three-phase energy storage inverter system of high-frequency isolation low cost
It is in the dynamical equation of three-phase static coordinate system：
Dynamic side of the DC-AC inverter output current under static α β coordinate systems in three-phase energy storage inverter system
Cheng Wei：
In formula, iα、iβFor DC-AC inverter output current under α β coordinate systems α, β component；uα、uβFor direct current-friendship
Flow inverter output voltage α, β component under α β coordinate systems；eα、eβFor line voltage under α β coordinate systems α, β component.
It is assumed that sampling period TsTo be smaller, formula (5) discretization can be obtained：
It is in k+1 moment DC-AC inverter predicted currents then：
It is assumed that reach given electric current in k+1 moment combining inverter electric currents, i.e.,
DC-AC inverter dc-link capacitance voltage in energy storage inverter system is：
It is assumed that the sampling time of discretization is Ts, formula (9) discretization can be obtained：
Wherein, iC1And i (k)C2(k) output current of the DC-AC inverter in energy storage inverter system can be passed through
Obtained with the switch function of inverter, without direct measurement.
DC-AC inverter current inner loop in three-phase energy storage inverter system uses limited on off state model prediction
Control, outer shroud Voltage loop use traditional pi controller.Current inner loop uses limited on off state Model Predictive Control
Main purpose be to realize to given the quick of electric current, accurate tracking and the T-shaped three-level three-phase inverter neutral point of low cost
Voltage balancing control.In the present invention, limited on off state Model Predictive Control object function selection be：
Wherein, iα(k)、iβ(k) for T-shaped three-level three-phase energy storage inverter system output current under α β rest frames
α, β component.λvIt is the weight coefficient of object function, the weight coefficient of object function is bigger, and its this function will be strengthened, and other
Function will weaken.λ may be selected in the weight coefficient of object function in the present systemv=0.2.
As shown in figure 4, three phase network phase voltage (ea、eb、ec) obtained by phaselocked loop (phase locked loop, PLL)
To the space angle θ of line voltage.DC bus-bar voltage Setting signalWith the DC bus-bar voltage V of realitydc(Vdc=VP+VN)
Deviation signal passing ratio integral controller and opposite sign obtain given d shaft current Setting signalsQ shaft current Setting signalsIt can be given according to the requirement of reactive power (sending reactive power and absorbing reactive power).D shaft current Setting signals
With q shaft current Setting signalsBy converting to obtain the given electricity of α axles under rest frame from dq rotating coordinate system to rest frame
StreamElectric current is given with β axlesAccording to (k) sampling instant three phase network phase voltage ea(k)、eb(k)、ec(k), direct current
Positive pole line voltage VP(k), direct current negative busbar voltage VN(k), inverter output three-phase current ia(k)、ib(k)、icAnd inverter (k)
Switch combination (Sa, Sb, Sc) predict (k+1) sampling instant inverter output current iα(k+1)、iβ(k+1) and direct current just
Busbar voltage VP(k+1), direct current negative busbar voltage VN(k+1).According to formula (11), the inverter for making object function (11) minimum is opened
Combination (altogether 18 kinds) is closed to apply in next switch periods.As actual DC busbar voltage VdcMore than given dc bus electricity
PressureThe deviation of two-phase voltage signal obtains d shaft current Setting signals by PI controllers and opposite signMore than 0, now, three-phase
Energy storage inversion system DC-AC inverter is operated in inverter mode, energy is conveyed into power network, lithium battery group is operated in electric discharge
State；As actual DC busbar voltage VdcLess than given DC bus-bar voltageThe deviation of voltage signal by PI controllers and
Opposite sign obtains d shaft current Setting signalsLess than 0, now, three-phase energy storage inversion system DC-AC inverter is operated in rectification
State, energy are conveyed to battery pack from power network, and lithium battery group is operated in charged state.Therefore, in three-phase energy storage inversion system
DC-AC inverter realizes the two-way flow of energy according to given DC bus-bar voltage automatically.Three-phase energy storage inversion system
In the limited on off state Model Predictive Control of DA/AC inverters there is no PWM module and current inner loop, realize dc bus
Voltage, active power, reactive power flexibly control.
As shown in figure 5, characteristic of the system according to lithium battery group, lithium battery group given voltage or electric current are respectivelyOr
Lithium battery group given voltage or electric current and the voltage or electric current of lithium battery group reality obtain DC-dc conversion by PI controllers
Device controls phase shift angleBy controlling different phase shifting angles, it is possible to achieve the charge and discharge of lithium battery group, realize energy
Two-way flow.
If the function described in the present embodiment method is realized in the form of SFU software functional unit and is used as independent product pin
Sell or in use, can be stored in a computing device read/write memory medium.Based on such understanding, the embodiment of the present invention
The part to be contributed to prior art or the part of the technical scheme can be embodied in the form of software product, and this is soft
Part product is stored in a storage medium, including some instructions to cause a computing device (can be personal computer,
Server, mobile computing device or network equipment etc.) perform all or part of step of each embodiment methods described of the present invention
Suddenly.And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), deposit at random
Access to memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be with it is other
The difference of embodiment, between each embodiment same or similar part mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (2)
- A kind of 1. T-shaped three-level three-phase energy storage inverter system, it is characterised in that including：Lithium battery group, energy in bidirectional flow are straight Stream-DC converter, DC-DC converter controller, energy in bidirectional flow direct-current-alternating-current converter and DC-AC become Permuter controller；Wherein：The lithium battery group is connected with the energy in bidirectional flow DC-DC converter；The DC-DC converter is connected with the energy in bidirectional flow direct-current-alternating-current converter；The energy in bidirectional flow direct-current-alternating-current converter is connected with power network；The DC-DC converter controller is connected with the energy in bidirectional flow DC-DC converter；The direct-current-alternating-current converter controller is connected with the energy in bidirectional flow direct-current-alternating-current converter；Wherein, the energy in bidirectional flow DC-DC converter includes：High frequency low voltage switch mosfet pipe S1, high frequency low voltage Switch mosfet pipe S2, high frequency low voltage switch mosfet pipe S3, high frequency low voltage switch mosfet pipe S4, high-frequency step-up transformer T1, filter inductance L1, high pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube Sd3, high pressure IGBT Switching tube Sd4, DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4；Wherein：The high frequency low voltage switch mosfet pipe S1, high frequency low voltage switch mosfet pipe S2, high frequency low voltage switch mosfet pipe S3, High frequency low voltage switch mosfet pipe S4 forms H4 bridges；The high pressure IGBT switching tube Sd1, high pressure IGBT switching tube Sd2, high pressure IGBT switching tube Sd3 and high pressure IGBT switching tube Sd4 forms a bridge arm of T-shaped three level as converter secondary in energy in bidirectional flow DC-DC converter, the change Another bridge arm of parallel operation secondary is DC bus-bar voltage electric capacity C2 and DC bus-bar voltage electric capacity C4 neutral points；The energy in bidirectional flow direct-current-alternating-current converter includes：T-shaped three-level three-phase three-leg inverter, filter inductance L2 With filter capacitor C3；Wherein：The T-shaped three-level three-phase three-leg inverter is made up of three bridge arms, and first bridge arm is switched by power high pressure IGBT Pipe Sa1, power high pressure IGBT switching tube Sa2, power high pressure IGBT switching tube Sa3 and power high pressure IGBT switching tube Sa4 are formed, Second bridge arm is by power high pressure IGBT switching tube Sb1, power high pressure IGBT switching tube Sb2, power high pressure IGBT switching tube Sb3 Formed with power high pressure IGBT switching tube Sb4, the 3rd bridge arm is opened by power high pressure IGBT switching tube Sc1 and power high pressure IGBT Pipe Sc4 is closed to form；The drive signal of the power high pressure IGBT switching tube Sa1 and power high pressure IGBT switching tube Sa3 drive signal are complementary, 2us dead times are set simultaneously, power high pressure IGBT switching tube Sa2 drive signal and power high pressure IGBT switching tube Sa4's Drive signal is complementary, while sets 2us dead times；Power high pressure IGBT switching tube Sb1 drive signal and power high pressure IGBT switching tubes Sb3 drive signal is complementary, while sets 2us dead times, power high pressure IGBT switching tube Sb2 driving letter Number and power high pressure IGBT switching tube Sb4 drive signal it is complementary, while 2us dead times are set；Power high pressure IGBT switchs Pipe Sc1 drive signal and power high pressure IGBT switching tube Sc4 drive signal are complementary, while set 2us dead times；The direct-current-alternating-current converter controller includes：Limited on off state forecast model and pi controller；The object function of the limited on off state forecast model is：<mrow> <mi>g</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <mrow> <mo>(</mo> <mo>|</mo> <msubsup> <mi>i</mi> <mi>&alpha;</mi> <mo>*</mo> </msubsup> <mo>(</mo> <mi>k</mi> <mo>)</mo> <mo>-</mo> <msub> <mi>i</mi> <mi>&alpha;</mi> </msub> <mo>(</mo> <mi>k</mi> <mo>)</mo> <mo>|</mo> <mo>+</mo> <mo>|</mo> <msubsup> <mi>i</mi> <mi>&beta;</mi> <mo>*</mo> </msubsup> <mo>(</mo> <mi>k</mi> <mo>)</mo> <mo>-</mo> <msub> <mi>i</mi> <mi>&beta;</mi> </msub> <mo>(</mo> <mi>k</mi> <mo>)</mo> <mo>|</mo> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>&lambda;</mi> <mi>v</mi> </msub> <mrow> <mo>(</mo> <mo>|</mo> <msub> <mi>V</mi> <mi>p</mi> </msub> <mo>(</mo> <mrow> <mi>k</mi> <mo>+</mo> <mn>1</mn> </mrow> <mo>)</mo> <mo>-</mo> <msub> <mi>V</mi> <mi>N</mi> </msub> <mo>(</mo> <mrow> <mi>k</mi> <mo>+</mo> <mn>1</mn> </mrow> <mo>)</mo> <mo>|</mo> <mo>)</mo> </mrow> <mo>;</mo> </mrow>Wherein, iα(k)、iβ(k) for T-shaped three-level three-phase energy storage inverter system output current, α, β divide under α β rest frames Amount, λvIt is the weight coefficient of object function, VP(k+1) it is direct current positive bus voltage, VN(k+1) it is direct current negative busbar voltage, Electric current is given for α axles under rest frame,Electric current is given for β axles under rest frame.
- 2. system according to claim 1, it is characterised in that the DC-DC converter controller controls including PI Device.
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| CN110572069B (en) * | 2018-06-06 | 2020-11-06 | 苏州捷芯威半导体有限公司 | Bidirectional DC-AC converter |
| CN108777479B (en) * | 2018-07-02 | 2019-10-25 | 上海大周信息科技有限公司 | DC bus micro-grid system |
| CN109039125B (en) * | 2018-08-17 | 2019-10-11 | 中国石油大学(华东) | T-type three-level inverter dead zone error voltage compensating method based on MSOGI-FLL |
| CN114362535B (en) * | 2021-11-30 | 2023-10-27 | 漳州科华电气技术有限公司 | Direct current conversion circuit and control method thereof |
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