CN106786729A - A kind of microgrid unsteady flow energy storage device and its energy management method - Google Patents
A kind of microgrid unsteady flow energy storage device and its energy management method Download PDFInfo
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Classifications
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- H02J3/385—
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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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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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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
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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
- 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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to generation of electricity by new energy and its field of energy management, and in particular to a kind of microgrid unsteady flow energy storage device and its energy management method, including：Six seven level single-phase inverter units of switch, battery are controlled and energy management unit, photovoltaic MPPT unit, accumulator cell charging and discharging administrative unit, super capacitor management of charging and discharging unit and load management unit with two-way DC/AC power converter cells, the two-way DC/AC power converter cells of super capacitor, microgrid current transformer energy storage device.The present invention can photovoltaic conversion electric energy be connected to the grid, balance system power swing, peak load shifting can be reached using energy storage device according to system capacity mobility status.Using six seven level single-phase inverters of switch, required device for power switching is few, and switching loss is low, and the output quality of power supply is high.Energy storage device use two-way DC/AC converters, compared to conventional current transformer, switching device used is few, and voltage output range is wide, SPWM modulation it is simple the advantages of, had broad application prospects in micro-capacitance sensor application field.
Description
Technical field
The present invention relates to generation of electricity by new energy and its field of energy management, and in particular to a kind of microgrid unsteady flow energy storage device and its
Energy management method.
Background technology
With the support energetically of national policy in recent years, increasing family's photovoltaic generation, cell photovoltaic generation, enterprise
Office block photovoltaic generation distributed generates electricity and is incorporated to utility network.The use of these new energy be although conducive to low-carbon emission reduction,
Increase economic benefit, but limited by environmental condition, with obvious intermittent and unstability, large-scale distributed photovoltaic
The access of electricity generation system, brings impact and disturbs to power grid operation.Micro-capacitance sensor technology is a kind of ratio for solving above-mentioned contradiction
Comparatively ideal means, micro-capacitance sensor is a kind of small-sized electric system that can realize self-contr ol and management, generally comprises distribution
Formula power supply, energy storage device, converter plant, associated loadings and energy management apparatus.Wherein play the current transformer knot of energy conversion
Structure and the important directions of energy management method micro-capacitance sensor research.Non-isolation type is used mostly for current small-power photovoltaic system
Inverter structure, such as single-phase full bridge type inverter, this kind of non-isolation type inverter have that output common mode voltage characteristic is poor, let out over the ground
The shortcomings of dew electric current is high, output level number is low, and to grid side harmonic, filter volume is big.In addition, large-scale distributed
The access of photovoltaic generating system, also brings challenge to power grid energy management, and the distributed power source of batch (-type) is to local micro-capacitance sensor
Voltage stability impact, to realize the Optimized Operation of energy, reach the effect of distributed power source peak load shifting, it is necessary to
Energy storage device is arranged in micro-capacitance sensor.The energy storage device of existing middle low power grid-connected system is arranged on dc bus side, capacity mostly
It is small, there is multilevel energy conversion, efficiency is low, while distributing arrangement is unfavorable for that energy is managed collectively.The present invention provides a kind of micro-
Net unsteady flow energy storage device and its energy management method, the energy storage section of the device use direct-connected microgrid AC form, reduce
Power conversion losses, while being not only restricted to the geographical position of micro battery, can be arranged in micro-capacitance sensor appropriate location, be easy to unification
Energy management.The DC/AC converters that energy storage section is constituted using two bidirectional current type BOOST converters, compared to traditional unsteady flow
Device, few with switching device, voltage output range is wide, SPWM modulation it is simple the advantages of.The parallel network reverse part of device uses six
Seven level single-phase inverters are switched, is that inverse parallel divides three groups of series connection two-by-two by six device for power switching, between every two groups simultaneously
One electric capacity of connection, by PWM control, it is possible to achieve single-phase seven level exchange output.Under being segmented using DC bus-bar voltage
Hang down and control, DC bus-bar voltage and energy storage device discharge and recharge relation are determined, by system power difference and the SOC of energy storage device itself
The fuzzy control strategy that situation determines determines the discharge and recharge action of battery and super capacitor.Should in distributed power source and micro-capacitance sensor
Had broad application prospects with field.
The content of the invention
(1) technical problem for solving
In view of the shortcomings of the prior art, the invention provides a kind of microgrid unsteady flow energy storage device and its energy management method,
It switchs seven level single-phase inverters by the voltage inversion of photovoltaic array and its maximal power tracing circuit output to friendship by six
Stream power network.In addition, according to microgrid energy operational management situation, by the energy storing structure direct-connected with AC, realizing micro-capacitance sensor
Energy conversion between AC and energy storage device direct current, DC bus-bar voltage segmentation droop control and the energy storage device charge and discharge of use
Electric fuzzy control strategy, reaches the energy-optimised scheduling such as balance system power swing, peak load shifting and uses.The simple work(of apparatus structure
Can be abundant, compared to existing technology, six seven level single-phase inverters of switch have the more excellent output quality of power supply, required power switch
Device is few, and switching loss is low, and control is simple.Energy storage section is become using the DC/AC of two bidirectional current type BOOST converter compositions
Parallel operation, few with switching device compared to conventional current transformer, voltage output range is wide, modulate it is simple the advantages of.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of microgrid unsteady flow energy storage device and its energy management method, including：Six seven level single-phase inverter units of switch,
Battery is filled with two-way DC/AC power converter cells, super capacitor two-way DC/AC power converter cells, microgrid current transformer and energy storage
Put control and energy management unit, photovoltaic MPPT unit, accumulator cell charging and discharging administrative unit, super capacitor management of charging and discharging list
Unit, load management unit, it is characterised in that：Micro battery is provided by photovoltaic array in micro-capacitance sensor, mono- by BOOST type photovoltaics MPPT
The level single-phase inverter unit of six switch seven is input to after unit.
Preferably, inverter by direct current energy inversion for industrial-frequency alternating current be input to exchange micro-capacitance sensor in, energy storage device bag
Include the two-way DC/AC power converter cells of the two-way DC/AC power converter cells of battery and super capacitor.
Preferably, battery and super capacitor are direct-connected by two-way DC/AC converters and AC, for balance system
Power swing.
Preferably, accumulator cell charging and discharging administrative unit and super capacitor management of charging and discharging unit using system power difference and
The fuzzy control strategy that the SOC situations of itself determine.
Preferably, microgrid current transformer and energy storage device control and energy management unit are segmented sagging using DC bus-bar voltage
Control, determines DC bus-bar voltage and energy storage device discharge and recharge relation, the action of control energy storage device and balance system power swing,
Micro-grid load is classified switching by load management unit, it is ensured that the reliable power supply of important load.
Preferably, six seven level single-phase inverter units of switch of use, by six device for power switching inverse parallels two-by-two
Divide three groups of series connection, be connected in parallel with a capacitor between every two groups, by PWM control, it is possible to achieve single-phase seven level exchange is defeated
Go out.
(3) beneficial effect
The invention provides a kind of microgrid unsteady flow energy storage device and its energy management method, the present apparatus can not only realize light
Volt converting electrical energy is connected to the grid, while balance system power waves can be reached using energy storage device according to system capacity mobility status
The effect such as dynamic, peak load shifting.Energy storage section is directly coupled to AC, and without energy intermediate conversion links, raising system is integrally imitated
Rate.The six seven level single-phase inverters of switch for using, required device for power switching is few, and switching loss is low, and the output quality of power supply is high.
The two-way DC/AC converters that energy storage device is constituted using two bidirectional current type BOOST converters, compared to conventional current transformer, institute
Few with switching device, voltage output range is wide, SPWM modulation it is simple the advantages of, there is wide application in micro-capacitance sensor application field
Prospect.
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
The accompanying drawing to be used needed for having technology description is 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 control flow chart of the invention；
Fig. 2 is the circuit structure diagram of six seven level single-phase inverters of switch in apparatus of the present invention；
Fig. 3 be super capacitor and batteries into hybrid energy-storing circuit structure schematic diagram；
Fig. 4 is energy storage device outer voltage control system block diagram；
Fig. 5 is batteries left side BOOST converter inductive current inner ring control system block diagram；
Fig. 6 is energy management fuzzy control strategy and energy storage device entirety control structure block diagram.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Implementation method one：In present embodiment, by taking six seven level single-phase inverter workflows of switch as an example, circuit structure
Schematic diagram is as shown in figure 1, illustrate that illumination is converted to the electric energy inversion grid connection course of work by device.If the output voltage of photovoltaic array
It is Vpv, is Vdc by being boosted after maximal power tracing circuit, according to the turn-on and turn-off shape of device for power switching in inverter
State, inverter may operate at following several modes：
Defining switch function is
So each node voltage can be expressed as with switch function such as in Fig. 1
So, inverter output AC side voltage can be expressed as
vad=vab+vbcvcd=(S1-S2)V1+(S2-S3)V2 (3)
Similarly, each node current is represented by with switch function
ic=i3-i2=(S3-S2)io (5)
According to capacitance voltage current relationship, it is known that
From above formula, the voltage V2 at electric capacity C2 two ends is relevant with switch function, to realize that the level of inverter seven is exported, can
V2=V1/3 is controlled with by closed loop PI, now, formula (3) can be rewritten as
During steady-state operation, electric capacity C1 both end voltages are photovoltaic array by the Vdc that boosted after maximal power tracing circuit, output
Voltage can be in ± Vdc, ± 2/3Vdc, ± 1/3Vdc and 0, totally seven kinds of level forms.
Implementation method two：In present embodiment, the control mode of analysis energy storage device and its boost type DC/AC current transformers.
Energy storage device using batteries and super capacitor hybrid energy-storing form, batteries charge and discharge electrical time constant is big, with filling
The increase reduced lifespan of discharge time is serious, and load factor changes the power-balance of low frequency part.Super capacitor compares battery
Charge-discharge velocity is fast, efficiency high long lifespan, is responsible for the power-balance of the HFS of load change.Circuit structure diagram such as Fig. 2 institutes
Show, the structure that batteries and super capacitor connect boost type DC/AC current transformers is completely the same.With batteries and its DC/AC
It is analyzed as a example by current transformer, device for power switching batt_S1, batt_S3 and RLbatt1 constitute left side BOOST type unsteady flows
Unit, device for power switching batt_S2, batt_S4 and RLbatt2 constitute right side BOOST type current transforming units.The two are identical
Boost DC conversions unit connected in differential circuit form, they export the double of anti-phase low frequency sinusoidal pulsating dc voltages
To power flow, AC network is connected across two output ends of DC converting unit.When battery transmits power to power network, inversion
Input direct voltage Vbatt is reverse into the low-frequency ac electric current for being superimposed with high fdrequency component for switch batt_S1, batt_S2
ILbatt1, iLbatt2, rectified switch batt_S3, are being become the low frequency of high-quality just after batt_S4 and output filter capacitor
String pulsating dc voltage vC1 and vC2, when power network transmits energy to battery, rectifier switch batt_S3, batt_S4 is operated in
Inverter mode, and inverse switch batt_S1, batt_S2 are operated in rectification state.If institute in the positive direction of each physical quantity such as Fig. 2
Show, the energy storage section of device may operate in following several modes.
Pattern one：Work as Vg>0、Ig<0、iLbatt1>0、iLbatt2<0, right side DC converting unit flows through reverse current,
By the lateral dc source energy feeding of microgrid AC power, BUCK charge modes are operated in.Left side DC converting unit is then opposite,
Energy is provided from battery to alternating current source, BOOST discharge modes are operated in.Because alternating current source electric current is negative, so
Energy of the energy of battery back transfer more than positive transmission.Both differences feed back to the energy of dc source for alternating current source
Amount.
Pattern two：Work as Vg>0、Ig<0、iLbatt1<0、iLbatt2>0, right side DC converting unit flows through forward current increasing
Greatly, energy is provided from battery to alternating current source, is operated in BOOST discharge modes.Left side DC converting unit is flowed through reversely
Electric current reduces, and by the lateral dc source energy feeding of AC power, is operated in BUCK charge modes.Now alternating current source electric current
Gradually increase but still be negative, so the energy of battery back transfer is still above the positive energy for transmitting.AC power is still
To battery feedback energy.
Pattern three：Work as Vg>0、Ig>0、iLbatt1<0、iLbatt2>0, right side DC converting unit flows through forward current,
Energy is provided from battery to alternating current source, BOOST discharge modes are operated in.Left side DC converting unit flows through reverse electricity
Stream, by the lateral battery energy feeding of AC power, is operated in BUCK charge modes.Now alternating current source electric current is just, to store
Battery starts to provide energy to alternating current source.
Pattern four：Work as Vg<0、Ig>0、iLbatt1<0、iLbatt2>0, now output voltage change is negative, but due to output electricity
Stream is remained as just, and this kind of mode of operation and pattern two are identical.
Pattern five：Work as Vg<0、Ig>0、iLbatt1>0、iLbatt2<0, now output voltage change is negative, but due to output electricity
Stream is remained as just, and this kind of mode of operation and pattern three are identical.
Pattern six：Work as Vg<0、Ig<0、iLbatt1>0、iLbatt2<0, right side DC converting unit flows through reverse current,
By the lateral battery energy feeding of AC power, BUCK charge modes are operated in.Left side DC converting unit flows through forward current,
Energy is provided to alternating current source, now alternating current source voltage x current is negative, and battery starts to microgrid alternating current source
Energy is provided.
As the above analysis, when needing to convey energy from battery to AC, energy accumulation current converter can be operated in mould
Formula three, five, six.For two groups of energy accumulation current converters, they are individually controlled respectively, they can respectively produce one has
The sine wave electrode output of direct current biasing.Left group energy storage converter driver element and right side energy storage converter drive single
Unit two 180 ° of converter output voltage phase mutual deviations are made by PWM, due to AC power be connected across two converters it
Between, the DC offset voltage that converter is exported respectively will cancel out each other in alternating current source, produce an ambipolar alternating current
Pressure output.When battery conveying energy lateral from exchange is needed, energy accumulation current converter can be operated in pattern one, two, four.
Each BOOST type DC converting unit is independent control, by taking the converter of left side as an example, based on BOOST conversion
Device continuous time averaging model, can obtain equation below
Vbatt-VRLbatt1=(1-dbatt1)Vc1 (8)
Vscap-VRLscap1=(1-dscap1)Vc1 (9)
iC1+iO1=(1-dbatt1)iLbatt1+(1-dscap1)iLscap1 (10)
In formula, represent two conductings of device for power switching of batt_S1 and scap_S1 temporarily empty ratio.
Assuming that voltage on line side reference value can be expressed as
Left side will export two different sine voltages with direct current biasing with two, right side DC converter, can be with
According to following given reference value, realized by controlling the voltage at C1 and C2 two ends.
It is direct current biasing amount in formula, can gives according to the following formula
Vbias≥Vbatt+Vo/2 (13)
Control system block diagram of the outer shroud with capacitance voltage as control targe is as shown in Figure 3.Inner ring is direct using inductive current
Current control, each Boost type transformer configuration is consistent, by taking the Boost type converter of battery left side as an example, inner ring control system
Structure chart is as shown in Figure 4.
Implementation method three：In present embodiment, energy control strategy and management method in the analysis present invention.It is female using direct current
Line voltage is segmented droop control, determines DC bus-bar voltage and energy storage device discharge and recharge relation, and control energy storage device action is with this
Balance system power swing.With reference to real system load power, photovoltaic array power, combining inverter rated power, energy storage dress
Capacity is put, setting 5 waypoints to d-c bus voltage value (corresponds to Vth1>Vth2>Vth3>Vth4>Vth5), it is corresponding to incite somebody to action
Five kinds of mode of operations are had, is made a concrete analysis of below.
System operating mode one：Work as Vth1<V dc<During V dcN, V dcN are provided separately in representing microgrid by photo-voltaic power supply
During energy, DC bus-bar voltage rated value, grid-connected power P inv=PI+kind (V dc-Vth1), during PI represents microgrid in formula
One-level important load power, kind is grid-connected power coefficient, can be adjusted according to actual conditions, and maximum occurrences are (PinvN-
PI)/(Vdc-Vth1), PinvN are the specified grid-connected power of inverter；Now, photo-voltaic power supply offer energy not only meets one-level
Important load, still there is surplus, and load control unit can control other load input coefficients.If energy storage device SOC≤0.9,
With specified charging current constant-current charge, super capacitor group balance high frequency charging current is coordinating batteries work for energy storage battery
Make；If SOC>0.9, then batteries and super capacitor group are charged or are directly entered by the floating pressure of its maximum allowable terminal voltage
Holding state.
System operating mode two：Work as Vth2<V dc<During Vth1, grid-connected inverters power P inv=PI+kind (Vdc-
Vth2), now, photo-voltaic power supply offer energy not only meets one-level important load, still there is surplus, and load control unit can control it
His load input coefficient.If SOC≤0.9, the charging current command value that batteries are determined with fuzzy power allocation unit
Carry out power transformation current charge, ultracapacitor group balance high frequency charging current is coordinating batteries to work；If SOC>0.9, then
Batteries by the floating pressure charging of its maximum allowable terminal voltage or are directly entered holding state with super capacitor group.
System operating mode three：As Vth3≤V dc≤Vth2, grid-connected inverters power P inv=PI+kind (V dc-
Vth3), other loads can be put into by load control unit in system, and energy balance and power swing are undertaken by energy storage device.
The two-way Boost type DC/AC converters balance low-frequency power fluctuations of batteries, the two-way Boost type DC/AC conversion of super capacitor group
Device with DC bus-bar voltage Vth2 be control targe balance high frequency power swing.
System operating mode four：As Vth4≤V dc ＜ Vth3, grid-connected inverters power P inv=PI+kind (V dc-
Vth4), if SOC >=0.2, batteries are put according to the discharge current command value that fuzzy power allocation unit gives
Point, super capacitor group balance high frequency discharge current is worked with coordinating batteries；If SOC<0.2, then converted in energy storage device
Device is in holding state.Now, in guarantee system important load power, other loads by load control unit disconnect.
System operating mode five：As Vth5≤V dc ＜ Vth4, grid-connected inverters power P inv=PI+kind (V dc-
Vth5), photo-voltaic power supply provides energy deficiency, and system power vacancy is serious；If SOC >=0.2, batteries are discharged with maximum
Current discharge, super capacitor group balance high frequency discharge current is worked with coordinating batteries；As V dc >=Vth4, it is contemplated that press
Load level puts into load.If SOC<0.2, to prevent power shortage, then energy storage subsystem converter is in holding state.
The central role of microgrid is to balance power swing, that is, energy balance, DC bus-bar voltage stabilization, system power
Distribution and energy management fuzzy control strategy schematic diagram are as shown in Figure 5.Dc-link capacitance is the hinge of energy exchange, bus electricity
The state change for holding voltage decides the stability of system.Can be by a ratio-product by electric capacity two ends current-voltage correlation
Point link obtains the reference value Pdc-ref that Cdc exchanges power.The power P PV that the value and photovoltaic array are provided is compared, can be with
Obtain the power difference between photo-voltaic power supply and micro-capacitance sensor, that is, energy-storage system value and power reference Psto-ref.Due to light
Fluctuation and the variability of load that volt generates electricity intrinsic, Psto-ref is a fast-changing amount.Due to being stored in energy-storage system
Battery pack inertia is larger, and super capacitor group can follow fast-changing amount.Therefore adopted between batteries and super capacitor group
The frequency decoupling of power is carried out with low pass filter to distribute, with reference to the SOC situations of energy storage device, using fuzzy logic control,
According to Pbatt-ref and the size of SOC value, the Pbatt* of fuzzy control output is used as giving that energy storage device PQ is controlled for control decision
Determine power signal, and then the voltage and current double closed-loop regulation for passing through each converter unit, realize the discharge and recharge of energy storage device, realize system
System power-balance.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (6)
1. a kind of microgrid unsteady flow energy storage device and its energy management method, including：Six seven level single-phase inverter units of switch
(1), battery two-way DC/AC power converter cells (2), super capacitor two-way DC/AC power converter cells (3), microgrid unsteady flow
It is device and energy storage device control and energy management unit (4), photovoltaic MPPT unit (5), accumulator cell charging and discharging administrative unit (6), super
Level capacitor charge and discharge administrative unit (7), load management unit (8), it is characterised in that：Micro battery is carried by photovoltaic array in micro-capacitance sensor
For by being input to level single-phase inverter unit (1) of six switch seven after BOOST type photovoltaics MPPT unit (5).
2. microgrid unsteady flow energy storage device according to claim 1 and its energy management method, it is characterised in that：Inverter will
Direct current energy inversion is input in exchange micro-capacitance sensor for industrial-frequency alternating current, and energy storage device is converted including battery with two-way DC/AC
Device unit (2) and super capacitor are with two-way DC/AC power converter cells (3).
3. microgrid unsteady flow energy storage device according to claim 1 and its energy management method, it is characterised in that：Battery and
Super capacitor is direct-connected by two-way DC/AC converters and AC, for balance system power swing.
4. microgrid unsteady flow energy storage device according to claim 1 and its energy management method, it is characterised in that：Battery fills
Electric discharge administrative unit (6) and super capacitor management of charging and discharging unit (7) are determined using system power difference and the SOC situations of itself
Fuzzy control strategy.
5. microgrid unsteady flow energy storage device according to claim 1 and its energy management method, it is characterised in that：Microgrid unsteady flow
Device and energy storage device control and energy management unit (4) are segmented droop control using DC bus-bar voltage, determine dc bus electricity
Pressure and energy storage device discharge and recharge relation, the action of control energy storage device and balance system power swing, load management unit (8) will be micro-
Network load is classified switching, it is ensured that the reliable power supply of important load.
6. microgrid unsteady flow energy storage device according to claim 1 and its energy management method, it is characterised in that：Six for using
Switch seven level single-phase inverters unit (1), by the inverse parallel point three groups of series connection two-by-two of six device for power switching, every two groups it
Between be connected in parallel with a capacitor, by PWM control, it is possible to achieve the exchange output of single-phase seven level.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933451A (en) * | 2018-09-10 | 2018-12-04 | 合肥阳光新能源科技有限公司 | Micro-grid system and its microgrid central controller and power distribution control method |
| CN110048396A (en) * | 2019-03-14 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of control system and method for light storage direct-current micro-grid |
| CZ308050B6 (en) * | 2018-10-31 | 2019-11-20 | České vysoké učenà technické v Praze | Device for charging accumulators from a photovoltaic source |
| CN110518608A (en) * | 2019-07-08 | 2019-11-29 | 华北电力大学（保定） | Isolated island microgrid energy control method based on hybrid energy-storing and electric automobile charging station |
| CN110912169A (en) * | 2019-12-03 | 2020-03-24 | 国网天津市电力公司 | Design method and topological structure of alternating current-direct current micro-grid |
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| WO2022022758A1 (en) | 2020-07-27 | 2022-02-03 | MGM COMPRO s.r.o. | Method of charging a battery from a photovoltaic panel |
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| CN117748595A (en) * | 2024-02-19 | 2024-03-22 | 宁波市电力设计院有限公司 | Offshore integrated power supply system based on clean energy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117552A (en) * | 2013-03-06 | 2013-05-22 | 山东电力研究院 | Hybrid energy storage system based on ordered energy control |
| CN104810857A (en) * | 2015-05-22 | 2015-07-29 | 郑州大学 | Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method |
| CN204858718U (en) * | 2015-06-06 | 2015-12-09 | 安徽工程大学 | Hierarchical supply control device of microgrid load |
| CN205160400U (en) * | 2015-10-16 | 2016-04-13 | 阜阳师范学院 | Seven single -phase inverter and photovoltaic power generation device |
-
2016
- 2016-11-22 CN CN201611031249.4A patent/CN106786729A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117552A (en) * | 2013-03-06 | 2013-05-22 | 山东电力研究院 | Hybrid energy storage system based on ordered energy control |
| CN104810857A (en) * | 2015-05-22 | 2015-07-29 | 郑州大学 | Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method |
| CN204858718U (en) * | 2015-06-06 | 2015-12-09 | 安徽工程大学 | Hierarchical supply control device of microgrid load |
| CN205160400U (en) * | 2015-10-16 | 2016-04-13 | 阜阳师范学院 | Seven single -phase inverter and photovoltaic power generation device |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11316342B2 (en) | 2018-02-06 | 2022-04-26 | Tdk Corporation | Direct current power supplying system |
| CN108933451B (en) * | 2018-09-10 | 2023-01-10 | 阳光新能源开发股份有限公司 | Microgrid system, microgrid central controller thereof and power distribution control method |
| CN108933451A (en) * | 2018-09-10 | 2018-12-04 | 合肥阳光新能源科技有限公司 | Micro-grid system and its microgrid central controller and power distribution control method |
| CZ308050B6 (en) * | 2018-10-31 | 2019-11-20 | České vysoké učenà technické v Praze | Device for charging accumulators from a photovoltaic source |
| CN110048396A (en) * | 2019-03-14 | 2019-07-23 | 中国电力科学研究院有限公司 | A kind of control system and method for light storage direct-current micro-grid |
| CN110048396B (en) * | 2019-03-14 | 2023-11-03 | 中国电力科学研究院有限公司 | Control system and method for optical storage direct current micro-grid |
| CN110518608A (en) * | 2019-07-08 | 2019-11-29 | 华北电力大学（保定） | Isolated island microgrid energy control method based on hybrid energy-storing and electric automobile charging station |
| CN110912169A (en) * | 2019-12-03 | 2020-03-24 | 国网天津市电力公司 | Design method and topological structure of alternating current-direct current micro-grid |
| CN111725865B (en) * | 2020-06-11 | 2022-08-02 | 深圳硕日新能源科技有限公司 | Wide-voltage inverse control all-in-one machine and control method thereof |
| CN111725865A (en) * | 2020-06-11 | 2020-09-29 | 深圳硕日新能源科技有限公司 | Wide-voltage inverse control all-in-one machine and control method thereof |
| WO2022022758A1 (en) | 2020-07-27 | 2022-02-03 | MGM COMPRO s.r.o. | Method of charging a battery from a photovoltaic panel |
| CN113199949A (en) * | 2021-03-10 | 2021-08-03 | 东北大学 | Multi-port energy conversion device for charging electric automobile and control method thereof |
| CN113199949B (en) * | 2021-03-10 | 2024-05-14 | 东北大学 | Multi-port energy conversion device for charging electric automobile and control method thereof |
| CN117748595A (en) * | 2024-02-19 | 2024-03-22 | 宁波市电力设计院有限公司 | Offshore integrated power supply system based on clean energy |
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