CN107039991A - A kind of light storage off-network independent power supply device and method based on MMC topologys - Google Patents
A kind of light storage off-network independent power supply device and method based on MMC topologys Download PDFInfo
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- CN107039991A CN107039991A CN201710269332.3A CN201710269332A CN107039991A CN 107039991 A CN107039991 A CN 107039991A CN 201710269332 A CN201710269332 A CN 201710269332A CN 107039991 A CN107039991 A CN 107039991A
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- 230000005611 electricity Effects 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a kind of light based on MMC topologys and stores up off-network independent power supply device, including：Photovoltaic array；The MMC topological transformation device being connected with photovoltaic array is used to store photovoltaic array electric energy；Four bridge legs, including the first and second IGBT, first IGBT colelctor electrodes are connected with photovoltaic array positive pole, 2nd IGBT emitter stages are connected with photovoltaic array negative pole, first IGBT emitter stages be connected with the 2nd IGBT colelctor electrodes after through bridge arm inductance connection to first, second, and third AC load common port, the first and second IGBT base stages are used to receive driving pulse；Zero sequence controller, driving pulse is obtained based on first, second, and third AC load voltage.The independently-powered method of off-network is stored up invention additionally discloses a kind of light based on MMC topologys, it is possible to reduce power off time after electric network fault, reduce user's loss, electrical stability is improved, utilization rate of electrical is improved, loss is reduced, the quality of power supply is good, realizes independent SOC controls, greatlys save equipment investment.
Description
Technical field
The present invention relates to a kind of electric supply installation.It is independently-powered more particularly, to a kind of light storage off-network based on MMC topologys
Device and method.
Background technology
In operation of power networks, when the grid collapses or according to dispatching of power netwoks needs, part operation area needs to set up
Independent off-grid system, for keeping the stable voltage of ac bus and frequency, to maintain the uninterrupted power supply to load.
With the development of new energy technology, photovoltaic generation turns into the important part of distributed energy, off-network type photovoltaic
Electricity generation system is widely used in the application places such as remote mountain area, non-Electric region, island, communication base station and street lamp.Photovoltaic arrays are having
Electric energy is converted the solar into the case of illumination, by solar charging discharging controller powering load, while to battery
Group charging；In no light, powered by solar charging discharging controller by batteries to DC load, while battery is also
To be powered directly to separate inverter unit, alternating current is reverse into by separate inverter unit, powered to AC load.But its electricity produced
Can have fluctuation and uncertainty, a series of adverse effects are brought to power distribution network, and energy-storage system is to solve problem above
A kind of effective means.Light-preserved system can get up unnecessary electrical power storage when electric energy is sufficient；In power shortage, release
Energy in energy-storage battery, so that load obtains continuous and stable electric energy supply.
At present, generally require to be equipped with high-tension battery in light-preserved system, cause the insecurity and unstability of system.And mould
Block Multilevel Inverters (Modular Multilevel Converter, MMC) can make energy storage list because of its modular construction
Member accesses in the form of low-voltage is scattered, it is to avoid the problem of potential in current light-preserved system.MMC has switching frequency low, opens
Close loss small；Many level outputs, the low feature of alternating voltage distortion rate of output is gathered around and had wide practical use.Off-grid system
It is also contemplated that internal substantial amounts of single-phase load, may result in output voltage asymmetric.Therefore, it is necessary to take measures to ensure three-phase
The stable equilibrium of output voltage.General way is the method using isolating transformer, the problem of without considering residual voltage.But
Its cost and volume are substantially increased, and are unfavorable for realizing the miniaturization of inverter.
Accordingly, it is desirable to provide a kind of light storage off-network independent power supply device and method based on MMC topologys.
The content of the invention
Stable electric energy supply is provided for uncompensated load under off-network operating mode to realize, the present invention proposes that one kind is based on
The light storage off-network independent power supply device and method of MMC topologys.By the way that photovoltaic array is linked into electric supply installation DC side, storage is utilized
Energy battery substitutes submodule electric capacity, and increase four bridge legs are controlled to zero-sequence component in load voltage, not only can be in injustice
The preferable quality of power supply is kept under weighing apparatus loading condition, and electric energy can be stored or mended in electric energy supply surplus or deficiency
Fill, improve the stability of electric energy supply.
Off-network independent power supply device is stored up it is an object of the present invention to provide a kind of light based on MMC topologys.
To reach above-mentioned purpose, the present invention uses following technical proposals：
A kind of light based on MMC topologys stores up off-network independent power supply device, including：
Photovoltaic array；
The MMC topological transformation devices being connected with photovoltaic array, MMC topological transformation device is included respectively with first, second, and third
First, second, and third connected bridge arm of AC load, for storing photovoltaic array electric energy；
Four bridge legs, including the first and second IGBT, the first IGBT colelctor electrodes are connected with photovoltaic array positive pole, the 2nd IGBT
Emitter stage is connected with photovoltaic array negative pole, the first IGBT emitter stages be connected with the 2nd IGBT colelctor electrodes after through bridge arm inductance connection extremely
First, second, and third AC load common port, the first and second IGBT base stages are used to receive driving pulse；
Zero sequence controller, driving pulse is obtained based on first, second, and third AC load voltage.
Preferably,
Each each upper bridge arm included in upper bridge arm and lower bridge arm, each bridge arm in first, second, and third bridge arm
It is composed in series with lower bridge arm by n energy-storage battery submodule with a bridge arm inductance, the positive pole and photovoltaic array of each upper bridge arm
Positive pole is connected, and the negative pole of each lower bridge arm is connected with photovoltaic array negative pole, and the negative pole of each upper bridge arm is connected with the positive pole of each lower bridge arm
And tie point is respectively a, b, c, first, second, and third AC load respectively through first, second, and third outputting inductance with
Tie point a, b, c are connected, and first, second, and third AC load two ends are parallel with first, second, and third output capacitance respectively,
Wherein, n is natural number.
It is further preferred that
Energy-storage battery submodule includes the 3rd IGBT, the 4th IGBT and power supply E, the 3rd IGBT colelctor electrodes and power supply E positive poles
It is connected, the 3rd IGBT emitter stages are connected with the 4th IGBT colelctor electrodes as energy-storage battery submodule positive pole, the 4th IGBT emitter stages
It is connected with power supply E negative poles as energy-storage battery submodule negative pole；
Reverse parallel connection has the first and second protection diodes to third and fourth IGBT respectively.
Preferably,
Zero sequence controller includes acquisition module, computing module and adjustment module, wherein
Acquisition module, for gathering first, second, and third AC load voltage；
Computing module, for carrying out coordinate system transformation to first, second, and third AC load voltage, calculates zero sequence control
The value of feedback and command value of device, driving pulse is worth to based on value of feedback and instruction；
First and second IGBT base stages of four bridge legs are driven by adjustment module using driving pulse.
It is further preferred that
Zero sequence controller also includes MPPT control modules, the operating point for adjusting photovoltaic array in real time, controls operating point
Positioned at maximum power point.
Preferably,
Zero sequence controller also includes SOC detection modules, the SOC states for monitoring energy-storage battery submodule in real time, control
It is electrically operated that energy-storage battery carries out charge and discharge.
Preferably,
Zero sequence controller also includes circulation control module, for gathering bridge arm current and based on bridge arm current to independently-powered
The working condition of device is monitored.
The independently-powered method of off-network is stored up it is another object of the present invention to provide a kind of light based on MMC topologys.
A kind of light based on MMC topologys stores up the independently-powered method of off-network, including：
Gather first, second, and third AC load voltage；
Coordinate transform is carried out to first, second, and third AC load voltage, under two-phase rest frame to positive sequence and
Negative sequence voltage is controlled, and obtains first, second, and third AC regulating voltage；
First, second, and third AC load voltage is added, the command value of zero sequence controller is obtained；
First, second, and third AC regulating voltage is added, the value of feedback of zero sequence controller is obtained；
Proportion of utilization resonant controller makes value of feedback trace command value, obtains the driving pulse of four bridge legs；
The first and second IGBT base stages of four bridge legs are driven using driving pulse.
Preferably,
The operating point of adjustment photovoltaic array, controls operating point to be located at maximum power point in real time.
Preferably,
The SOC states of monitoring energy-storage battery submodule, control energy-storage battery to carry out charge and discharge electrically operated in real time.
Beneficial effects of the present invention are as follows：
A kind of the light storage off-network independent power supply device and method based on MMC topologys of the present invention, for off-network power supply occasion
When, it is possible to reduce power off time after electric network fault, reduces user's loss, improves electrical stability, improve utilization rate of electrical, reduce
Loss, the quality of power supply is good, can realize that independent SOC is controlled by multistage submodule energy storage device.Meanwhile, cost of implementation
Low, the modulation voltage for only increasing newly-increased bridge arm is calculated, and greatlys save equipment investment.
Brief description of the drawings
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows that the light based on MMC topologys stores up off-network independent power supply device structural representation.
Fig. 2 shows that the light based on MMC topologys stores up the independently-powered method flow diagram of off-network.
Fig. 3 shows that the light based on MMC topologys stores up off-network independent power supply device control method schematic diagram.
Embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
Belong to " first ", " second " etc. in description and claims of this specification and above-mentioned accompanying drawing are to be used to distinguish
Different objects, rather than for describing particular order.In addition, term " comprising " and " having " and their any deformations, meaning
Figure is to cover non-exclusive include.For example contain some row steps or process, method, system, product or the equipment of unit
The step of being not limited to list or unit, but alternatively also include the step of do not list or unit, or alternatively also
Including for these processes, method or the intrinsic gas step of equipment or unit.
Stable electric energy supply is provided for uncompensated load under off-network operating mode to realize, the present invention proposes that one kind is based on
The light storage off-network independent power supply device of MMC topologys.Photovoltaic array can be linked into electric supply installation DC side, energy-storage battery is utilized
Submodule electric capacity is substituted, increase four bridge legs are controlled to zero-sequence component in load voltage.Not only can be by the method
The preferable quality of power supply is kept under the conditions of unbalanced load, and electric energy can be stored in electric energy supply surplus or deficiency
Or supplement, improve the stability of electric energy supply.
The device is based on MMC topologys, and it is the light storage independent power supply device for possessing three-phase four-arm to be expanded.Utilize
Photovoltaic MPPT technique adjusts the operating point of photovoltaic array in real time, is allowed to always work near maximum power point, realizes that photovoltaic is sent out
Electric installation, which generates electricity, to be maximized；The SOC states of energy-storage battery on submodule are monitored in real time, obtain the discharge and recharge instruction of energy-storage battery；
Using the threephase load voltage collected, positive sequence and negative sequence voltage are controlled under two-phase rest frame, three-phase is obtained
Modulation voltage, by obtained threephase load voltage and modulation voltage be added sum, respectively as the feedback of zero sequence controller
Value and command value, so that the modulation voltage of newly-increased bridge arm is obtained, because the negative phase-sequence and zero-sequence component in load voltage are pressed down
System, therefore the balance of threephase load voltage can be realized under the conditions of unbalanced load.
A kind of light based on MMC topologys stores up off-network independent power supply device, including photovoltaic array, MMC topological transformation device, the 4th
Bridge arm and zero sequence controller, wherein：
MMC topological transformation devices are connected with photovoltaic array, including be connected respectively with first, second, and third AC load
First, second and the 3rd bridge arm, for storing photovoltaic array electric energy.It is each including upper bridge in first, second, and third bridge arm
Each upper bridge arm and lower bridge arm in arm and lower bridge arm, each bridge arm is by n energy-storage battery submodule and a bridge arm inductance string
Joint group into, the positive pole of each upper bridge arm is connected with photovoltaic array positive pole, and the negative pole of each lower bridge arm is connected with photovoltaic array negative pole, it is each on
The negative pole of bridge arm is connected with the positive pole of each lower bridge arm and tie point is respectively a, b, c, first, second, and third AC load difference
It is connected by first, second, and third outputting inductance with tie point a, b, c, first, second, and third AC load two ends difference
First, second, and third output capacitance is parallel with, wherein, n is natural number.Energy-storage battery submodule includes the 3rd IGBT, the 4th
IGBT and power supply E, the 3rd IGBT colelctor electrodes are connected with power supply E positive poles, and the 3rd IGBT emitter stages are connected with the 4th IGBT colelctor electrodes
As energy-storage battery submodule positive pole, the 4th IGBT emitter stages are connected with power supply E negative poles as energy-storage battery submodule negative pole, the
Reverse parallel connection has the first and second protection diodes to three and the 4th IGBT respectively.
Four bridge legs, including the first and second IGBT, the first IGBT colelctor electrodes are connected with photovoltaic array positive pole, the 2nd IGBT
Emitter stage is connected with photovoltaic array negative pole, the first IGBT emitter stages be connected with the 2nd IGBT colelctor electrodes after through bridge arm inductance connection extremely
First, second, and third AC load common port, the first and second IGBT base stages are used to receive driving pulse；
Zero sequence controller, driving pulse is obtained based on first, second, and third AC load voltage.Zero sequence controller includes
Acquisition module, computing module and adjustment module, wherein acquisition module are used to gather first, second, and third AC load voltage；
Computing module is used to carry out coordinate system transformation to first, second, and third AC load voltage, calculates the feedback of zero sequence controller
Value and command value, driving pulse is worth to based on value of feedback and instruction；Adjustment module is using driving pulse to the of four bridge legs
One and the 2nd IGBT base stages are driven.
Further, zero sequence controller also includes MPPT control modules, the operating point for adjusting photovoltaic array in real time, control
Operating point processed is located at maximum power point.
Zero sequence controller also includes SOC detection modules, the SOC states for monitoring energy-storage battery submodule in real time, control
It is electrically operated that energy-storage battery carries out charge and discharge.
Zero sequence controller also includes circulation control module, for gathering bridge arm current and based on bridge arm current to independently-powered
The working condition of device is monitored.
Based on above-mentioned off-network independent power supply device, the invention also provides a kind of light storage off-network based on MMC topologys is independent
Method of supplying power to, including：
S1：Gather first, second, and third AC load voltage；
S2：Coordinate transform is carried out to first, second, and third AC load voltage, to positive sequence under two-phase rest frame
It is controlled with negative sequence voltage, obtains first, second, and third AC regulating voltage；
S3：First, second, and third AC load voltage is added, the command value of zero sequence controller is obtained；
S4：First, second, and third AC regulating voltage is added, the value of feedback of zero sequence controller is obtained；
S5：Proportion of utilization resonant controller makes value of feedback trace command value, obtains the driving pulse of four bridge legs；
S6：The first and second IGBT base stages of four bridge legs are driven using driving pulse.
In the present invention, when carrying out voltage modulated, MPPT control modules adjust the operating point of photovoltaic array in real time, control work
Point is located near maximum power point.SOC detection modules monitor the SOC states of energy-storage battery submodule in real time, control energy-storage battery
Carry out charge and discharge electrically operated.
Illustrated with reference to a specific embodiment
As shown in figure 1, a kind of light based on MMC topologys stores up off-network independent power supply device, wherein, MMC topological transformation device 1 is used
In connection independent power supply device DC side with exchanging survey.
MMC topological transformation device 1 includes the first bridge arm, the second bridge arm and the 3rd bridge arm, wherein, the first bridge arm is included on first
Bridge arm and first time bridge arm, the second bridge arm include second on bridge arm and second time bridge arm, the 3rd bridge arm include the 3rd on bridge arm with
The three times bridge arms.Bridge arm on first, bridge arm is connected with photovoltaic array PV positive pole on bridge arm and the 3rd on second, first time bridge
Arm, second time bridge arm and the three times bridge arms are connected with photovoltaic array PV negative pole, bridge arm and first time bridge arm tie point on first
For a, bridge arm and second time bridge arm tie point are that bridge arm and the three time bridge arm tie points are c on b, the 3rd on second.Bridge on first
Arm, first time bridge arm, bridge arm on second, second time bridge arm, on the 3rd each in bridge arm and the three times bridge arms respectively by n storage
Can a battery submodule SM and bridge arm inductance LaIt is composed in series, wherein n energy-storage battery submodule is respectively SM1、SM2、
SM3、…SMn。
Energy-storage battery submodule SM by dc source E, switching element T 1, T2 and respectively with its antiparallel diode D1,
D2 is constituted.T1 colelctor electrode is connected with power supply E positive poles, and T1 emitter stage is connected as energy-storage battery submodule with T2 colelctor electrode
SM positive poles, T2 emitter stage is connected with power supply E negative poles as energy-storage battery submodule SM negative poles.
Exchange, which is surveyed, includes the first load Ra, the second load Rb and the 3rd load Rc, and the first load Ra, second load Rb and the
Three load Rc one end is connected to AC load common port, and the other end is connected to tie point a, b and c through outputting inductance Lf respectively, the
One load Ra, the second load Rb and the 3rd load Rc two ends are parallel with output capacitance Cf, outputting inductance Lf and output capacitance respectively
Cf as independent power supply device output filter part.
DC side also includes four bridge legs 2, and four bridge legs 2 include the first IGBT and the 2nd IGBT, the first IGBT colelctor electrodes
It is connected with photovoltaic array positive pole, the 2nd IGBT emitter stages are connected with photovoltaic array negative pole, the first IGBT emitter stages and the 2nd IGBT
Through bridge arm inductance connection to first, second, and third AC load common port, the first and second IGBT base stages after colelctor electrode is connected
For receiving driving pulse；
As control section, independent power supply device of the invention also includes zero sequence controller, for based on first, second He
3rd AC load voltage obtains driving pulse.
Zero sequence controller includes acquisition module, computing module, adjustment module, MPPT control modules, SOC detection modules and ring
Flow control module.Wherein, acquisition module is used to gather first, second, and third AC load voltage；Computing module is used for the
First, second and the 3rd AC load voltage carry out coordinate system transformation, calculate zero sequence controller value of feedback and command value, based on anti-
Feedback value and instruction are worth to driving pulse；Adjustment module is entered using driving pulse to the first and second IGBT base stages of four bridge legs
Row driving；MPPT control modules are used for the operating point for adjusting photovoltaic array in real time, and control operating point is located near maximum power point；
SOC detection modules are used for the SOC states for monitoring energy-storage battery submodule in real time, and it is electrically operated that control energy-storage battery carries out charge and discharge；Ring
Flow control module is used to gather bridge arm current and be monitored the working condition of independent power supply device based on bridge arm current.
As shown in Fig. 2 based on above-mentioned off-network independent power supply device, the invention also provides a kind of light based on MMC topologys
The independently-powered method of off-network is stored up, including：
S1：Gather first, second, and third AC load voltage；
S2：Coordinate transform is carried out to first, second, and third AC load voltage, to positive sequence under two-phase rest frame
It is controlled with negative sequence voltage, obtains first, second, and third AC regulating voltage；
S3：First, second, and third AC load voltage is added, the command value of zero sequence controller is obtained；
S4：First, second, and third AC regulating voltage is added, the value of feedback of zero sequence controller is obtained；
S5：Proportion of utilization resonant controller makes value of feedback trace command value, obtains the driving pulse of four bridge legs；
S6：The first and second IGBT base stages of four bridge legs are driven using driving pulse.
As shown in figure 3, its control process is as follows：
The positive sequence voltage component that there is rotate counterclockwise in unbalance voltage (load voltage) and the negative phase-sequence turned clockwise
Component of voltage, in order to obtain symmetrical alternating voltage, it is necessary to which the negative sequence component in load voltage is suppressed into zero.Uα *、Uβ *、U0 *
It is the voltage instruction value under two-phase rest frame, Uα、Uβ、U0It is the voltage feedback value under two-phase rest frame.ea、
eb、ecFor three-phase modulations voltage.
Coordinate transformating technology is widely employed in the vector control system of rectifier and double-fed generator, three-phase is quiet
Only the sinusoidal quantity such as Current Voltage under coordinate system is converted into the DC quantity under synchronous rotating frame, and this aspect is for simplification
The model of system, realizes active power and the decoupling with reactive power, is on the other hand because PI controllers can not be to sinusoidal quantity
Realize zero steady state error control.Coordinate transform simplifies the design of control system outer shroud, is but mutually coupled current component, causes inner ring
It is complicated, difficult design.PR controllers can realize the zero steady state error control to exchange input.PR controllers are become for net side
In the control system of parallel operation, electric current can be adjusted under two-phase rest frame.Can be with the coordinate during simplify control
Conversion, eliminates and electric current is adjusted under two-phase rest frame.Electric current can be eliminated with the coordinate transform during simplify control
Coupled relation between d, q axis component, and perturbation action of the line voltage to system can be ignored.In addition, using PR controllers,
Low-order harmonic compensation is easily achieved, these both contribute to the structure of simplified control system.
The gain at fundamental frequency is very high due to open-loop transfer function for PR controllers in the present invention, stable state during Closed loop track
Amplitude and phase can realize DAZ gene.
Control section is by voltage control loop section, loop current suppression link, MPPT and energy-storage battery SOC controlling units and carrier wave
Phase shift modulation circuit is constituted.Using obtained Pulse Width Control submodule switch motion, the alternating current for making electric supply installation output stable
Pressure.
The present invention uses MMC topological structures, and MMC has many structures suitable for high-power application scenario and output
Feature：
(1) structure of high modularization is conducive to shortening engineering design and process-cycle, is easy to system maintenance and is easy to superfluous
Remaining job design；
(2) off-center operation ability：Because the operation principle of each phase bridge arms of MMC is identical, and can independent control, when
MMC remains to reliability service when AC-input voltage is uneven or occurs local fault；
(3) fault traversing and recovery capability：MMC has good fault ride-through capacity, because MMC DC energy storage
Amount is big, and when net side breaks down, power cell will not discharge, and common DC bus voltage is still continuous, not only ensure MMC's
Stable operation, and can recover in the short period of time from malfunction；
And traditional two level voltage code converters (Voltage Sourced Converter, VSC) are discontinuous (4)
" copped wave " waveform is different, and MMC bridge arm current is continuous, and ripple frequency is higher, can significantly reduce to exchange output filtering
The requirement of inductance.
Apparatus and method of the present invention, electric supply installation DC side is linked into by photovoltaic array, and son is substituted using energy-storage battery
Module capacitance, increase four bridge legs are controlled to zero-sequence component in load voltage.Not only can be in imbalance by the method
The preferable quality of power supply is kept under loading condition, and electric energy can be stored or mended in electric energy supply surplus or deficiency
Fill, improve the stability of electric energy supply.
In the present invention, MMC topological structures increase four bridge legs newly, save heavy transformer, simple in construction and realize three-phase
The balance control of load voltage；Energy-storage battery replaces storage capacitor, can monitor SOC (state-of-charge) state of energy-storage battery,
Realize charge and discharge control；MPPT technique is introduced, the maximum elelctrochemical power generation of photovoltaic array can be realized；Modular multi-level converter is opened up
Flutter and ensure that the quality of power supply.
Those skilled in the art will further appreciate that, the various illustratives described with reference to the embodiments described herein
Logic plate, module, circuit and algorithm steps can be realized as electronic hardware, computer software or combination of the two.To be clear
Explain to Chu this interchangeability of hardware and software, various illustrative components, frame, module, circuit and step be above with
Its functional form makees vague generalization description.Such feature be implemented as hardware or software depend on concrete application and
Put on the design constraint of total system.Technical staff can be realized described for every kind of application-specific with different modes
Feature, but such realize that decision-making should not be interpreted to cause departing from the scope of the present invention.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical scheme is extended out still in protection scope of the present invention.
Claims (10)
1. a kind of light based on MMC topologys stores up off-network independent power supply device, it is characterised in that including：
Photovoltaic array；
The MMC topological transformation devices being connected with the photovoltaic array, the MMC topological transformation device include respectively with first, second and
First, second, and third connected bridge arm of 3rd AC load, for storing the photovoltaic array electric energy；
Four bridge legs, including the first and second IGBT, the first IGBT colelctor electrodes are connected with the photovoltaic array positive pole, described
2nd IGBT emitter stages are connected with the photovoltaic array negative pole, the first IGBT emitter stages and the 2nd IGBT colelctor electrode phases
Through bridge arm inductance connection to the first, second, and third AC load common port, the first and second IGBT base stages after even
For receiving driving pulse；
Zero sequence controller, the driving pulse is obtained based on first, second, and third AC load voltage.
2. the light according to claim 1 based on MMC topologys stores up off-network independent power supply device, it is characterised in that
Each in first, second, and third bridge arm include in upper bridge arm and lower bridge arm, each bridge arm it is each on
Bridge arm and lower bridge arm are composed in series by n energy-storage battery submodule with a bridge arm inductance, the positive pole of each upper bridge arm with
The photovoltaic array positive pole is connected, and the negative pole of each lower bridge arm is connected with the photovoltaic array negative pole, each upper bridge arm
Negative pole is connected with the positive pole of each lower bridge arm and tie point is respectively a, b, c, first, second, and third AC load point
Not Jing Guo first, second, and third outputting inductance be connected with tie point a, b, c, first, second, and third AC load two
End is parallel with first, second, and third output capacitance respectively, wherein, n is natural number.
3. the light according to claim 2 based on MMC topologys stores up off-network independent power supply device, it is characterised in that
The energy-storage battery submodule includes the 3rd IGBT, the 4th IGBT and power supply E, the 3rd IGBT colelctor electrodes and the electricity
Source E positive poles are connected, and the 3rd IGBT emitter stages are connected as the energy-storage battery submodule with the 4th IGBT colelctor electrodes
Positive pole, the 4th IGBT emitter stages are connected as the energy-storage battery submodule negative pole with the power supply E negative poles；
Reverse parallel connection has the first and second protection diodes to third and fourth IGBT respectively.
4. the light according to claim 1 based on MMC topologys stores up off-network independent power supply device, it is characterised in that described zero
Sequence controller includes acquisition module, computing module and adjustment module, wherein
Acquisition module, for gathering first, second, and third AC load voltage；
Computing module, for carrying out coordinate system transformation to the first, second, and third AC load voltage, calculates the zero sequence
The value of feedback and command value of controller, driving pulse is worth to based on the value of feedback and instruction；
First and second IGBT base stages of four bridge legs are driven by adjustment module using the driving pulse.
5. the light according to claim 4 based on MMC topologys stores up off-network independent power supply device, it is characterised in that
The zero sequence controller also includes MPPT control modules, and the operating point for adjusting the photovoltaic array in real time controls institute
Operating point is stated positioned at maximum power point.
6. the light according to claim 4 based on MMC topologys stores up off-network independent power supply device, it is characterised in that
The zero sequence controller also includes SOC detection modules, the SOC states for monitoring energy-storage battery submodule in real time, control
It is electrically operated that energy-storage battery carries out charge and discharge.
7. the light according to claim 4 based on MMC topologys stores up off-network independent power supply device, it is characterised in that
The zero sequence controller also includes circulation control module, for gathering bridge arm current and based on the bridge arm current to independence
The working condition of electric supply installation is monitored.
8. the light storage off-network based on MMC topologys of the independent power supply device any one of application claim 1-7 is independently supplied
Method for electrically, it is characterised in that including：
Gather first, second, and third AC load voltage；
Coordinate transform is carried out to the first, second, and third AC load voltage, under two-phase rest frame to positive sequence and
Negative sequence voltage is controlled, and obtains first, second, and third AC regulating voltage；
First, second, and third AC load voltage is added, the command value of zero sequence controller is obtained；
First, second, and third AC regulating voltage is added, the value of feedback of zero sequence controller is obtained；
Proportion of utilization resonant controller makes value of feedback trace command value, obtains the driving pulse of four bridge legs；
The first and second IGBT base stages of four bridge legs are driven using the driving pulse.
9. the light according to claim 8 based on MMC topologys stores up the independently-powered method of off-network, it is characterised in that also include：
The operating point of the photovoltaic array is adjusted in real time, controls the operating point to be located at maximum power point.
10. the light according to claim 8 based on MMC topologys stores up the independently-powered method of off-network, it is characterised in that also wrap
Include：
The SOC states of monitoring energy-storage battery submodule, control energy-storage battery to carry out charge and discharge electrically operated in real time.
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| CN111224589B (en) * | 2020-02-19 | 2023-04-07 | 苏州乾能电气有限公司 | Common-mode voltage control method for double-fed motor converter system |
| CN111245269A (en) * | 2020-03-02 | 2020-06-05 | 东南大学 | Modularized multi-level inverter based on micro energy storage unit |
| CN111769578A (en) * | 2020-06-06 | 2020-10-13 | 嘉兴恒创电力设计研究院有限公司 | Active energy control strategy based on battery charge balance and system thereof |
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