CN108649594A - A kind of distributed energy storage system for low-voltage distribution network - Google Patents
A kind of distributed energy storage system for low-voltage distribution network Download PDFInfo
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- CN108649594A CN108649594A CN201810414257.XA CN201810414257A CN108649594A CN 108649594 A CN108649594 A CN 108649594A CN 201810414257 A CN201810414257 A CN 201810414257A CN 108649594 A CN108649594 A CN 108649594A
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- 238000009826 distribution Methods 0.000 title claims abstract description 33
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- 238000000034 method Methods 0.000 claims description 8
- 101000984533 Homo sapiens Ribosome biogenesis protein BMS1 homolog Proteins 0.000 claims description 7
- 102100027057 Ribosome biogenesis protein BMS1 homolog Human genes 0.000 claims description 7
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- 238000013461 design Methods 0.000 abstract description 3
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- 239000002253 acid Substances 0.000 description 8
- 210000004027 cell Anatomy 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 238000007599 discharging Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000012983 electrochemical energy storage Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- 208000032953 Device battery issue Diseases 0.000 description 2
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 2
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- 239000005864 Sulphur Substances 0.000 description 1
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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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- 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
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention proposes a kind of distributed energy storage system for low-voltage distribution network, three two-way power switch S1, S2 and S3 are increased on the basis of traditional three-level inverter, increased component on the basis of according to system design goal three newly-increased two-way switch are controlled.A kind of distributed energy storage system for low-voltage distribution network of the invention can be achieved at the same time：The control functions such as harmonics restraint, reactive-load compensation, imbalance of three-phase voltage improvement, current in middle wire improvement, charge control, control of discharge, and the redundancy of existing dc-battery are spare.
Description
Technical field
The present invention relates to intelligent network distribution technical field, especially a kind of distributed energy storage systems for low-voltage distribution network.
Background technology
Electric energy is important energy source indispensable in modern society, and very extensive answer is obtained in different fields
With this also makes the carrying of modern power network very harsh.With the development of modern industrial technology, nonlinear-load is big in electric system
Amount increases.Various non-linear and time variation electronic device such as inverter, rectifier and various Switching Power Supplies etc. are answered on a large scale
With caused negative effect is also increasingly apparent.Meanwhile with the fast development of distributed energy, a large amount of distributed new
Access distribution.These a large amount of distributed news, for representative, have extremely strong fluctuation and uncertainty with wind, light etc..
It is a large amount of to fluctuate plant-grid connection system in the practical application of new energy, larger challenge is proposed to the stable operation of power grid, it is right
Power scheduling etc. also proposed high requirement.And since distribution cannot achieve the on-site elimination of whole distributed power generations,
It causes largely to abandon wind and abandons optical phenomenon.It improves the utilization ratio of distributed energy, improve the automatization level for compressing distribution, enhancing
Distribution network electric energy quality ability of regulation and control etc. is that modernization distribution needs key problems-solving.Especially for distribution network terminal, due to supplying
Electric radius is larger, distribution especially the voltage fluctuation of the end of rural area distribution, harmonic wave, three-phase imbalance the problems such as it is more serious.
Meanwhile with the improvement of people's living standard in our country, also there is larger variation, especially electric vehicle in end electrical equipment
Development, the ability that high-power load is born to distribution also proposed higher requirement.
It includes PCS, battery and BMS systems that traditional energy-storage system, which uses,.Energy accumulation current converter (PCS) can control accumulator
Charging and discharging process carries out the transformation of alternating current-direct current, can directly be that AC load is powered under no grid condition.PCS is by DC/
The compositions such as AC bidirectional converters, control unit.PCS controllers receive Background control instruction by communication, according to power instruction
Symbol and size control current transformer are charged the battery or are discharged, and realize the adjusting to network re-active power and reactive power.
PCS controllers are communicated by CAN interface and BMS, obtain battery state information, it can be achieved that protectiveness charge and discharge to battery,
Ensure battery operation safety.Energy accumulation current converter (PCS) can control the charging and discharging process of accumulator, carry out the change of alternating current-direct current
It changes, can directly be that AC load is powered under no grid condition.PCS is made of DC/AC bidirectional converters, control unit etc..
PCS controllers by communication receive Background control instruction, according to the symbol of power instruction and size control current transformer to battery into
The adjusting to network re-active power and reactive power is realized in row charge or discharge.PCS controllers are logical by CAN interface and BMS
News obtain battery state information, it can be achieved that protectiveness charge and discharge to battery, it is ensured that battery operation safety.Energy storage PCS is main
Charging and discharging for battery control, and can control the charging of battery, discharge current, power and voltage, are charged and discharged
Operating mode also has constant pressure, constant current and invariable power operating mode.
The energy storage technology of mainstream includes two class of the energy storage of physics class and electrochemical energy storage at present.Physics class energy storage has：Draw water storage
Energy, compressed air, flywheel energy storage and superconducting energy storage, open cycle gas-turbine etc..Electrochemical energy storage has：Sodium-sulphur battery, vanadium
Battery, lithium battery, lead-acid battery etc..Wherein, electrochemical energy storage technology is due to the construction period is short, operation cost is low, to ring
Border is without the preferred option for having become the solution new energy access of power grid application energy storage technology the features such as influence.New Energy Industry
Demand energy-storage battery, development New Energy Industry must greatly develop high safety, the long-life, high-energy density energy-storage battery.Needle
Large capacity is required to the energy-storage battery of power grid application, more common is lithium ion battery, sodium-sulphur battery and flow battery in the market
Technology.For power grid stored energy application, especially wind power generation energy accumulation application, full vanadium cell and sodium-sulphur battery are two kinds main
The commercial technology approved by market.Vanadium cell by the vanadium ion of different valence state mutually convert realize electric energy storage with release
It puts.When charging, by the charging to battery, converts electrical energy into chemical energy and be stored in the vanadium ion of different valence state；Work as power generation
When device cannot meet rated output power, battery starts to discharge, and the chemical energy of storage is converted into electric energy.The capacity of vanadium cell
Depending on the storage of electrolyte, theoretically for, its device for storing liquid can be made very big, as long as and it is not contaminated, it
Service life can be very long.The charging-discharging performances of vanadium cell are good, can carry out powerful charging and discharging, and addressing degree of freedom is big, takes up an area
It is few, solar energy and wind energy can be dissolved into house or industrial site well.Vanadium cell is as a kind of Novel clean energy
Source storage device by its high-power, long-life, supports frequency by the application verification of the country such as the U.S., Japan, Australia
The apparent technical advantage such as numerous high current charge-discharge, green non-pollution, be mainly used in the renewable sources of energy generate electricity by way of merging two or more grid systems, urban distribution network storage
The fields such as energy, remote power feeding, ups system, island application.In global portable energy-storage battery market, lithium ion battery is due to it
There is absolute predominance in terms of energy density and occupy most shares.
Lithium ion battery is most common electrochemical energy storage cell, mobile phone, laptop battery be mostly lithium-ion electric
Pond.Superiority in high energy efficiency and power capacity also allows the market expansion of lithium ion battery to field of traffic.Compact lithium cell
Research and development and popularization are extremely successful, and still, the enlargement of lithium battery is difficult, and it is high to face cost height, running temperature
The problems such as with easy short circuit.Although having been achieved for substantial progress in terms of the research and development of lithium ion battery, also need to very much
It works to extend the service life of battery, safety when also improving battery use simultaneously reduces material cost.From lithium battery
For usage amount, ev industry should be significantly larger than wind, opto-electronics, and this trend can keep considerably long one section
Time.It is extremely complex on energy hole although lithium battery scale is excessive, national grid is in wind-light storage transmission integration
Lithium ion battery is still tended in project bid.
In the energy storage battery used in wind energy, solar energy system, lead-acid accumulator still occupies more share, this master
If lead-acid accumulator efficiency for charge-discharge is high, heat resistance is good, capacity is big, safety is good, at low cost.Wind energy, solar power generation
Installed capacity will be developed with speed quickly, lead-acid accumulator be important component in electricity generation system and off-grid system not
Alternative component, therefore the demand of accumulator will increase sharply.But due to well-known environmental issue, plumbic acid
Battery front side faces raw situation after of rearranging the mountains and rivers.Lead carbon battery is the technology come out from traditional lead-acid battery evolution, research
Personnel have found, increase some carbon, can significantly improve the service life of lead-acid battery.As the rear alternative of solar energy and wind energy energy storage
, lead-acid battery energy density is high, is a good selection.But the popularization of lead carbon battery is also faced with cost problem.
The major function of battery management system (BMS) is：1) accurately estimate SOC.It is accurate to estimate the charged of power battery pack
State (State of Charge, i.e. SOC), i.e. battery dump energy, ensure that SOC is maintained in reasonable range, prevent due to
Overcharging or overdischarging causes to damage to battery, and shows the dump energy of hybrid vehicle energy-storage battery, i.e. energy storage at any time
The state-of-charge of battery.(2) dynamic monitoring.In battery charge and discharge process, acquire in real time every in accumulator of electric car group
The terminal voltage and temperature of block battery, charging and discharging currents and battery pack total voltage prevent battery from overcharging or overdischarging phenomenon occurs.
Battery condition can be provided in time simultaneously, picks out problematic battery, keep the reliability and high efficiency of whole group battery operation,
Make remaining capacity estimation model is implemented as possibility.In addition to this, the usage history archives of every piece of battery also to be established, for into
One-step optimization and exploitation Novel electric, charger, motor etc. provide data, and foundation is provided for the off-line analysis system failure.Battery
The process of charge and discharge would generally be measured in real time using precision higher, the better current sensor of stability, general electric current
It is different according to the front end size of current of BMS, to select corresponding transducer range to be approached, by taking 400A as an example, generally use
Open-loop principles, producer both domestic and external be all made of can low temperature resistant, high temperature, macroseism JCE400-ASS current sensors, selection pass
Need to meet precision height when sensor, response time fast feature.(3) equilibrium between battery.As single battery equalizaing charge, makes
Each battery all reaches balanced consistent state in battery pack.Balancing technique is that the current world is endeavouring the one of research and development
The key technology of item battery management system (bms).However, existing energy-storage system, which all has, can not participate in utility power quality control
Disadvantage.
Invention content
The present invention proposes a kind of distributed energy storage system for low-voltage distribution network.
Realize that technical solution of the invention is：A kind of distributed energy storage system for low-voltage distribution network, feature exist
In, including three-level current transformer, the first DC capacitor C1, the second DC capacitor C2, the first battery pack B1, the second battery pack B2,
Positive voltage side power switch S1, negative voltage side power switch S2, neutral point side power switch SN, the first battery management system
BMS1, the second battery management system BMS2, converter control system and charging handover control system, wherein three level
The positive voltage port P+ of current transformer connects with one end of positive voltage side power switch S1 and one end of the first DC capacitor C1 respectively
Connect, the negative voltage port P- of the three-level current transformer respectively with one end of negative voltage side power switch S2 and the second direct current
Holding one end connection of C2, the other end of the second DC capacitor C2 is connect with the other end of the first DC capacitor C1, and described three
The neutral point port N of level current transformer is connect with the other end of the second DC capacitor C2, the neutral point of the three-level current transformer
Port N is connect with one end of neutral point side power switch SN simultaneously, the other end and first of the positive voltage side power switch S1
The anode connection of battery pack B1, the cathode of the first battery pack B1 other end and second with neutral point side power switch SN respectively
The anode connection of battery pack B2, the cathode of the second battery pack B2 are connect with the other end of negative voltage side power switch S2, institute
State the first battery management system BMS1, the second battery management system BMS2 acquires the first battery pack B1 and the second battery pack B2 respectively
Battery status pass to charging handover control system, the charging handover control system is straight by the first DC capacitor C1 and second
Galvanic electricity holds the voltage at the both ends C2 and the battery status of the first battery pack B1 and the second battery pack B2 pass to current transformer control system
System, the converter control system is for providing mode switching control.
Compared with prior art, the present invention its remarkable advantage is：(1) Redundant Control of battery is realized.In two groups of batteries
In group, if any one group of cell malfunctions, this group of battery pack and system are separated, realizing another set battery pack and system just
Often work.The stability and reliability of system are improved significantly.(2) system design difficulty is reduced, system spirit is improved
Activity.In the present invention, (the 1.1 of system alternating voltage peak can be reduced to the voltage of single group battery pack by realizing
~1.3) flexibility of system/2, is improved.(3) three are increased in battery pack B1 and the junction of battery pack B2 and DC capacitor
A power switch, these three power switch can be several according to system function requirement, the balance of voltage strategy of battery, safeguard protection etc.
A level designs control strategy.
Further detailed description is done to the present invention below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is a kind of schematic diagram of distributed energy storage system for low-voltage distribution network of the invention.
Specific implementation mode
In conjunction with shown in Fig. 1, the distributed energy storage system for low-voltage distribution network of the invention is installed on the low of network distribution transformer
Near the electrical equipment for pressing side or user.Using low pressure parallel connection access system, access voltage is 400V.By increasing this
Three power switch realize various control pattern, and the energy storage member devices such as battery, capacitance are improved while ensureing system working performance
The utilization ratio and service life of part.The concrete structure of distributed energy storage system of the present invention for low-voltage distribution network be：
The positive voltage port P+ of three-level current transformer respectively with one end of positive voltage side power switch S1 and the first direct current
One end of capacitance C1 connects, the one end with negative voltage side power switch S2 respectively the negative voltage port P- of the three-level current transformer
And second DC capacitor C2 one end connection, the other end of the second DC capacitor C2 is another with the first DC capacitor C1's
End connection, the neutral point port N of the three-level current transformer are connect with the other end of the second DC capacitor C2, and three level becomes
The neutral point port N for flowing device is connect with one end of neutral point side power switch SN simultaneously, the positive voltage side power switch S1's
The other end is connect with the anode of the first battery pack B1, and the cathode of the first battery pack B1 is another with neutral point side power switch SN respectively
The anode connection of one end and the second battery pack B2, the cathode of the second battery pack B2 are another with negative voltage side power switch S2's
One end connect, the first battery management system BMS1, the second battery management system BMS2 acquire respectively the first battery pack B1 and
The battery status of second battery pack B2 passes to charging handover control system, and the charging handover control system is by the first direct current
The voltage and the battery status of the first battery pack B1 and the second battery pack B2 for holding C1 and the second both ends DC capacitor C2 pass to
Converter control system, the converter control system is for providing mode switching control.
The present invention provides mode switching control by converter control system, passes through the various combination to each power switch
Control realizes that four kinds of operating modes, specific works pattern are：
1, operating mode 1：Positive voltage side power switch S1, negative voltage side power switch S2, neutral point side power switch SN
It is off simultaneously.
The first battery pack B1 and the second battery pack B2 at this time is in complete isolation, the i.e. work of three-level current transformer
Work is completely isolated with the charge and discharge of battery pack.Any pass does not occur for the DC voltage of three-level current transformer and the voltage of battery pack
Connection relationship.Therefore, three-level current transformer constitutes traditional compensation equipment in parallel with DC capacitor under this shape body, realizes
The functions such as reactive-load compensation, harmonics restraint, voltage fluctuation improvement, the three-phase imbalance improvement of power grid.
2, operating mode 2：Positive voltage side power switch S1 and negative voltage side power switch S2 are closed, and neutral point side power is opened
SN is closed to disconnect.
The first battery pack B1 and the second battery pack B2 at this time is in series connection, and with the first DC capacitor C1 and second
DC capacitor C2 is connected in parallel, and supports DC voltage.In this operating mode, the voltage at DC capacitor both ends and the first electricity
The voltage of pond group B1 and the second battery pack B2 and equal.DC capacitor and current transformer in the present embodiment are the typical knot of three level
Structure, DC capacitor are connected in series by capacitor group C1 and capacitor group C2, and neutral point N is directly connected in the neutrality of three phase inverter bridge
Point, the structure generate three different level outputs in exchange side.It carries especially for neutral point and is three times in A/B/C phase lines
Electric current, therefore need to subject for capacitor group and flow through same electric current, in order to avoid so big electric current flows through electricity
Pond group influences the service life of battery, so using the operating mode.
3, operating mode 3：Positive voltage side power switch S1 and neutral point side power switch SN are closed (conducting) state, negative electricity
Side power switch S2 is pressed to disconnect.
Under this operating mode, the first battery pack B1 is in parallel with the first DC capacitor C1 and the second DC capacitor C2, the second electricity
The cathode of the first battery pack of anode B1 of pond group B2 connects, but the cathode of the second battery pack B2 is off, therefore electricity
Pond group B2 is in vacant state.Under this operating mode, by controlling the voltage at the first both ends DC capacitor C1, to the first battery pack
B1 carries out charge or discharge.
4, operating mode 4：Negative voltage side power switch S2 and neutral point side power switch SN are closed, and positive voltage side power is opened
S1 is closed to disconnect.
Under this operating mode, the second battery pack B2 is in parallel with the second DC capacitor C2, the cathode of the first battery pack B1 and
The anode connection of two battery pack B2, the anode of the first battery pack B1 is off, therefore battery pack B1 is in vacant state.
Under this operating mode, by controlling the voltage at the second both ends DC capacitor C2, charge or discharge is carried out to the second battery pack B2.
Operating mode 3 and operating mode 4 control the first battery pack B1 and the second battery pack B2 work, therefore first respectively
Battery pack B1 and the second battery pack B2 are spare each other, when the first battery pack B1 breaks down, using operating mode 4；Conversely, working as
When second battery pack B2 breaks down, using operating mode 3.Thus, the distributed energy storage system for low-voltage distribution network of the invention
System is provided with redundancy standby functions to battery failure.
The distributed energy storage system for low-voltage distribution network of the present invention is monitored in power grid in real time by current transformer control module
Idle, harmonic wave and the information such as three-phase imbalance amount, and after being compared with desired value, difference is made to give birth to using SPWM modes
At the control command of inverter bridge.
Converter control system is used to provide the specific method of mode switching control：
Electric current Is and the access of step 1, the load current Il for acquiring incoming transport busbar or distributed energy storage system side
The voltage Us of ac bus access point；
Step 2 is based on instantaneously according to the load current Il of the acquisition or voltage Us of the electric current Is of system side and access point
The idle theoretical harmonic current calculated in real time in load or system, reactive current, imbalance of three-phase voltage component, active demand
Component and undulate quantity；
Step 3, by the data detected in step 2 respectively compared with the reference target value of setting, difference will be compared as control
The reference quantity of system, when control targe is set as comprising active compensation, positive voltage side power switch S1 and negative voltage side power are opened
S2 is closed to be closed, neutral point side power switch SN is disconnected, and inverter control system utilizes traditional SPWM control strategies, according to
It controls reference quantity and generates real-time three-level inverter power switch control signal；The first battery pack B1 of detection, the in real time simultaneously
The state of two battery pack B2, when the first battery pack B1 and the second battery pack B2 can not work normally, into operating mode 1；
When the first battery pack B1 failures, the second battery pack B2 normal works, into operating mode 4；When the first normal works of battery pack B1
Make, when the second battery pack B2 failures, into operating mode 3.
The present invention realizes various control pattern by increasing by three power switch, while ensureing system working performance
Improve the utilization ratio and service life of the energy storage components such as battery, capacitance.
A kind of course of work of distributed energy storage system for low-voltage distribution network of the invention is：
Distributed energy storage system for low-voltage distribution network after powering, first by three-level current transformer into line precharge control
System.This preliminary filling electric control by the voltage of direct current capacitors C1 and C2 and is charged to and battery pack B1 and battery pack B2 phases using low current
Deng state, this process first has to that cell voltage is fed back to current transformer control by BMS (battery management system) 1 and BMS2
System, the voltage of converter control system real-time sensing capacitor group C1 and capacitor group C2, is meeting capacitor group C1 and electricity
The voltage of container group C2 and with the voltage of battery pack B1 and battery pack B2 and when, just control S1 and S2 and be closed.At this point, system enters
Operating mode 2.
Distributed energy storage system for low-voltage distribution network is by detecting the idle of power grid, harmonic wave or three-phase unevenness point
Amount, these components are compared with the desired value of setting, and the difference after comparing is used to control the distribution for low-voltage distribution network
Energy-storage system generates the compensation component of response, can also flexibly be combined above-mentioned component.Meanwhile for low-voltage distribution network
Distributed energy storage system can receive higher level's control system, artificial setting or the active component generated according to certain rule, will
The active component is added to the voltage link in converter control system, and charge or discharge are carried out by Voltage loop control system,
Its charge or discharge power may be implemented controllably.
The state of the first battery pack B1 of detection, the second battery pack B2 in real time, as the first battery pack B1 and the second battery pack B2
When can not work normally, into operating mode 1；When the first battery pack B1 failures, the second battery pack B2 normal works, enter
Operating mode 4；When the first battery pack B1 normal works, the second battery pack B2 failures, into operating mode 3.The present invention is arranged
Two groups of battery management systems BMS1 and BMS2 are respectively used to the battery shape of detection the first battery pack B1 and the second battery pack B2
State, wherein when inconsistent if there is two groups of battery pack shapes, especially by the first battery management system BMS1 and the second battery
When management system BMS2 can not carry out Balance route, this, which is turned out in this two groups of battery packs, there is failure for one group therein, or
Two groups of battery packs of person all break down.At this point, the data using two groups of battery management systems carry out the pre- of battery failure state
Sentence, and using preset relatively data, provides the anticipation conclusion of battery shape body.When the first battery pack B1 and the second battery pack
When B2 can not work normally, into operating mode 1；When the first battery pack B1 failures, the second battery pack B2 normal works, into
Enter operating mode 4；When the first battery pack B1 normal works, the second battery pack B2 failures, into operating mode 3.
Claims (3)
1. a kind of distributed energy storage system for low-voltage distribution network, which is characterized in that including three-level current transformer, the first direct current
Hold C1, the second DC capacitor C2, the first battery pack B1, the second battery pack B2, positive voltage side power switch S1, negative voltage side power
Switch S2, neutral point side power switch SN, the first battery management system BMS1, the second battery management system BMS2, converter control
System processed and charging handover control system, wherein the positive voltage port P+ of the three-level current transformer respectively with positive voltage side
One end of power switch S1 and the connection of one end of the first DC capacitor C1, negative voltage port P- points of the three-level current transformer
It is not connect with one end of one end of negative voltage side power switch S2 and the second DC capacitor C2, the second DC capacitor C2's
The other end is connect with the other end of the first DC capacitor C1, the neutral point port N and the second direct current of the three-level current transformer
Hold the other end connection of C2, the neutral point port N of the three-level current transformer while one end with neutral point side power switch SN
Connection, the other end of the positive voltage side power switch S1 are connect with the anode of the first battery pack B1, and the first battery pack B1's is negative
Pole is connect with the anode of the other end of neutral point side power switch SN and the second battery pack B2 respectively, the second battery pack B2
Cathode connect with the other end of negative voltage side power switch S2, the first battery management system BMS1, the second battery management
System BMS2 acquires the first battery pack B1 respectively and the battery status of the second battery pack B2 passes to charging handover control system, institute
Charging handover control system is stated by the voltage and the first battery pack B1 of the first DC capacitor C1 and the second both ends DC capacitor C2
Converter control system is passed to the battery status of the second battery pack B2, the converter control system is for providing switch control
Molding formula.
2. the distributed energy storage system according to claim 1 for low-voltage distribution network, which is characterized in that the current transformer control
The mode switching control that system processed provides, specially：
Operating mode 1：Positive voltage side power switch S1, negative voltage side power switch S2, neutral point side power switch SN locate simultaneously
In off-state；
Operating mode 2：Positive voltage side power switch S1 and negative voltage side power switch S2 are closed, and neutral point side power switch SN is disconnected
It opens；
Operating mode 3：Positive voltage side power switch S1 and neutral point side power switch SN are closed (conducting) state, negative voltage side work(
Rate switch S2 is disconnected；
Operating mode 4：Negative voltage side power switch S2 and neutral point side power switch SN are closed, and positive voltage side power switch S1 is disconnected
It opens.
3. based on the distributed energy storage system for low-voltage distribution network described in claim 2, which is characterized in that current transformer control system
The specific method for providing mode switching control of uniting is：
The electric current Is and incoming transport of step 1, the load current Il for acquiring incoming transport busbar or distributed energy storage system side
The voltage Us of busbar access point；
Step 2 is based on instantaneous reactive according to the load current Il of the acquisition or voltage Us of the electric current Is of system side and access point
Theoretical harmonic current, reactive current, imbalance of three-phase voltage component, the active demand component calculated in real time in load or system
And undulate quantity；
Step 3, by the data detected in step 2 respectively compared with the reference target value of setting, difference will be compared as control
Reference quantity, when control targe is set as comprising active compensation, positive voltage side power switch S1 and negative voltage side power switch S2
It is closed, neutral point side power switch SN is disconnected, and inverter control system utilizes SPWM control strategies, according to control reference quantity
Generate real-time three-level inverter power switch control signal；Detect the first battery pack B1, the second battery pack B2 in real time simultaneously
State, when the first battery pack B1 and the second battery pack B2 can not work normally, into operating mode 1；When the first battery
Group B1 failures, when the second battery pack B2 is worked normally, into operating mode 4；When the first battery pack B1 normal works, the second battery
When group B2 failures, into operating mode 3.
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