CN106130026A - A kind of double-deck micro-capacitance sensor group's voltage control method - Google Patents
A kind of double-deck micro-capacitance sensor group's voltage control method Download PDFInfo
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- CN106130026A CN106130026A CN201610322648.XA CN201610322648A CN106130026A CN 106130026 A CN106130026 A CN 106130026A CN 201610322648 A CN201610322648 A CN 201610322648A CN 106130026 A CN106130026 A CN 106130026A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
-
- 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
-
- H02J3/383—
-
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of double-deck micro-capacitance sensor group's voltage control method.For the micro-capacitance sensor group of cascaded structure, voltage unbalance factor is divided into by the method two regions, when voltage unbalance factor is less, by ground floor control action；When voltage unbalance factor is bigger, starts the second layer and control, ground floor control and the second layer controls common effect.Ground floor controls to use quasi-ratio resonance to control, and it acts on the main power source in micro-capacitance sensor group.Second layer control action Tie line Power in micro-capacitance sensor group.The method can keep the voltage stabilization of micro-capacitance sensor group effectively, and can obtain when processing micro-capacitance sensor group's Voltage unbalance and preferably control effect.
Description
Technical field
The invention belongs to the Control of Voltage of micro-capacitance sensor group, relate to a kind of double-deck micro-capacitance sensor group's voltage control method.
Background technology
Micro-capacitance sensor is in the new electric energy supply scheme of power distribution network end, and interval of can effectively dissolving and distributed power generation go out
Power, and improve customer power supply reliability.Interconnection is there is mutually for required mesolow distribution wire between multiple adjacent micro-capacitance sensor
Lu Shi, forms micro-capacitance sensor group system, is called for short micro-capacitance sensor group.Micro-capacitance sensor group is in-depth and the continuity of micro-capacitance sensor.Micro-capacitance sensor group exist
Mountain area, outlying village, island group, urban power distribution network end etc. have broad application prospects, and are worth further investigation.
Find by prior art documents, document " series connection and many micro-grid systems hierarchical coordinative control of parallel-connection structure
System strategy " (Zhou Niancheng, Jin Ming, Wang Qianggang, Su Shi, Yan Yuting. many micro-grid systems hierarchical coordinative of series connection and parallel-connection structure controls
Strategy [J]. Automation of Electric Systems .2013；37 (12): 13-8.) according to the series connection between many microgrids and networking structure in parallel, if
Count many micro-grid systems two-stage hierarchical control scheme of series and parallel different structure.Dominant eigenvalues control for many micro-grid systems
System, grid-connected and island mode switching, propose the cooperation strategy between many microgrid central controllers of series and parallel structure.Literary composition
Offer " Autonomous Model micro-capacitance sensor group's multiple elements design energy storage system capacity collocation method " (field Baconic, Xiao Xi, Ding Ruoxing, Huang Xiuqiong. autonomous
Type micro-capacitance sensor group's multiple elements design energy storage system capacity collocation method [J]. Automation of Electric Systems .2013 (01): 168-73.) examine
Worry energy type energy-storage system supplements ceiling capacity vacancy and the excess energy of absorption maximum, power-type energy-storage system stabilize maximum work
Rate fluctuates, it is proposed that the capacity configuration side of dissimilar energy-storage system in the main energy-storage system of microgrid group and sub-microgrid energy-storage system
Method.Document " Supply-adequacy-based optimal construction of microgrids in
Smartdistribution systems " (Arefifar S A, Mohanmed Y A I, EL-Fouly T H M.Supply-
adequacy-based optimal construction of microgrids in smartdistribution
Systems [J] .IEEE Transaction on Smart Grid, 2012,3 (3): 1491-1502.) have studied micro-capacitance sensor group
Structure, with micro-grid load on-site elimination maximize and micro-capacitance sensor between exchange minimum power as target, it is achieved power optimized
Distribution, reduces year energy loss.Document " Multi-microgrid energy systems operation
incorporating distribution-interline power flow controller》(Kargarian A,
Rahmani M.Multi-microgrid energy systems operation incorporating
distribution-interline power flow controller[J].ELECTR POW SYST RES.2015；129:
208-16.) proposing a kind of multi-objective optimization algorithm for micro-capacitance sensor group, it is crowded with operating cost, voltage deviation and feeder line
Degree is optimization aim.
Above with respect to the research of micro-capacitance sensor group, it is concentrated mainly on coordination control, capacity configuration and optimization operation aspect, rarely has
The analysis and research of the Voltage unbalance situation occurred when micro-capacitance sensor group's off-network is run.For above not enough, the present invention proposes
A kind of double-deck voltage control method, the method can keep the voltage stabilization of micro-capacitance sensor group effectively, and micro-processing
Can obtain during electrical network group's Voltage unbalance and preferably control effect.
Summary of the invention
In place of the invention aims to solve above-mentioned the deficiencies in the prior art, it is provided that a kind of double-deck
Voltage control method, it is possible to while keeping micro-capacitance sensor group's voltage stabilization, processes micro-capacitance sensor group's voltage imbalance question and also can
Obtain and preferably control effect.
A kind of double-deck micro-capacitance sensor group's voltage control method, the steps include:
(1) micro-capacitance sensor group's voltage, power information are gathered, according to information of voltage calculating voltage unbalance factor:
Wherein,Va、VbAnd VcRepresent the phase voltage amplitude of A, B and C three-phase, V respectivelyavgFor three-phase
The meansigma methods of phase voltage amplitude.
(2) when voltage unbalance factor < when 1%, by ground floor control action, the transmission function of this layer of controller is:
This layer of voltage control strategy utilizes inverter fed voltage with regulation AC voltage to ensure output voltage
Stable, it uses the double-loop control scheme of outer voltage current inner loop, and realizes under α β coordinate system.Double control ring all uses standard
Ratio resonant controller, Control of Voltage outer shroud is stablized AC side of converter voltage magnitude and frequency, and is determined α axle and β shaft current
Reference value, electric current controls internal ring and realizes the quick tracking of electric current according to the current reference value that outer voltage provides.
Wherein: s is complex frequency domain operator, ω1For the angular frequency of line voltage, ωcFor one relevant to high gain region bandwidth
Angular frequency, KPWith KRThe ratio that is as the criterion resonance control coefrficient, α and β is two coordinate axess of coordinate system.
(3) when voltage unbalance factor > 1% time, by ground floor control and the second layer control act on, by second layer control simultaneously
The regulated quantity of the Tie line Power of system calculating micro-capacitance sensor group's bus A, B, C three-phase and single-phase micro-capacitance sensor:
ΔP1=Pa-min(Pa,Pb,Pc)
ΔP2=Pb-min(Pa,Pb,Pc)
ΔP3=Pc-min(Pa,Pb,Pc)
Wherein, Pa、PbAnd PcRepresent the single-phase output of micro-capacitance sensor group bus A, B, C respectively；ΔP1、ΔP2With Δ P3Point
Biao Shi the regulated quantity of Tie line Power of micro-capacitance sensor group's bus A, B, C three-phase and single-phase micro-capacitance sensor.
(4) second layer controls first to be handed down in each sub-microgrid the Tie line Power regulated quantity of each single-phase micro-capacitance sensor
Photovoltaic, if photovoltaic output can not meet, then recalls energy storage, by jointly acting on to meet interconnection of photovoltaic and energy storage
The regulated quantity of exchange power.
Compared with prior art, the invention have the advantages that and technique effect: for micro-capacitance sensor group, propose a kind of double-deck
The voltage control method of structure, and voltage unbalance factor is divided into two regions, by the coordination control of ground floor Yu the second layer
System, while keeping micro-capacitance sensor group's voltage stabilization, also can obtain preferable control for micro-capacitance sensor group's voltage imbalance question
Effect.
Accompanying drawing explanation
Fig. 1 is micro-capacitance sensor group structure figure.
Fig. 2 is ground floor control structure block diagram.
Fig. 3 is second layer control structure block diagram.
Fig. 4 is micro-capacitance sensor group experimental waveform figure when accessing unbalanced load.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is done and describes in detail further, but embodiments of the present invention are not
It is limited to this.
Fig. 1 is micro-capacitance sensor group structure figure, and micro-capacitance sensor group is made up of 5 sub-microgrids (abbreviation microgrid), its neutron microgrid 1 and son
Microgrid 2 is three-phase microgrid, and sub-microgrid 3, sub-microgrid 4 are in single-phase microgrid and their nested sub-microgrids 1 with sub-microgrid 5, respectively
Individually it is connected on A, B, C three-phase of sub-microgrid 1.Whole micro-capacitance sensor group is connected with power distribution network by chopper.When chopper disconnects,
Whole micro-capacitance sensor group i.e. switches to islet operation.The most sub-microgrid (2,3,4 and 5) is still connected in sub-microgrid 1, by sub-microgrid 1
Voltage and frequency is provided to support for whole micro-capacitance sensor group.
Fig. 2 is ground floor control structure block diagram, and this voltage control strategy is to utilize inverter fed voltage to regulate exchange
Side voltage ensures stablizing of output voltage, uses the double-loop control scheme of outer voltage current inner loop.Outer voltage can be protected
Stablizing of card output voltage, current inner loop constitutes electric current servo system can greatly speed up the dynamic process resisting disturbance. voltage electricity
Stream double-loop control takes full advantage of the status information of system, and not only dynamic property is good, and stable state accuracy is the highest.Meanwhile, current inner loop
Increase the bandwidth of inverter control system so that inverter dynamic response is accelerated.
This control strategy realizes under α β coordinate system, and α axle and β axle are separately controlled, the controller design complete of two axles
Causing, inverter uses SPWM modulation.Double control ring all uses quasi-ratio resonance to control controller, and Control of Voltage outer shroud stablizes unsteady flow
Device AC voltage magnitude and frequency, and determine α axle and β shaft current reference value.Electric current controls internal ring and is given according to outer voltage
Current reference value realize the quick tracking of electric current, the amplitude of its output voltage and phase place are controlled.
Fig. 3 is second layer control structure block diagram, and micro-capacitance sensor group's second layer control strategy is based on ground floor control strategy
Fine setting further, to obtaining more preferable voltage-controlling effect.This layer of control strategy is primarily directed to micro-capacitance sensor group's isolated island
During operation, the situation of the Voltage unbalance of appearance.As it is shown on figure 3, the action of this layer of control strategy is based on to micro-capacitance sensor group electricity
The judgement of pressure degree of unbalancedness.When voltage degree of unbalancedness < when 1%, i.e. ground floor voltage control strategy reply micro-capacitance sensor group electricity
Pressure can obtain time uneven when preferably controlling effect, and second layer control strategy is not involved in regulation.Injustice when voltage
Weighing apparatus degree >=1% time, second layer control strategy starts action, and it is mainly by the single-phase sub-microgrid 2,3 and 4 of regulation and three-phase
The Tie line Power of microgrid 1 realizes the further fine setting to micro-capacitance sensor group's voltage.It is by calculating sub-microgrid 2,3 and
4 and the Tie line Power regulated quantity Δ P of the sub-microgrid of three-phase 11、ΔP2With Δ P3, then judge that the photovoltaic in each sub-microgrid is defeated
Go out the scalable amount Δ P of powerpvWhether more than Δ P.If the scalable amount Δ P of the photovoltaic output in sub-microgridpvIt is more than
In Δ P, the most sub-microgrid, photovoltaic output increases Δ P.If the scalable amount Δ P of the photovoltaic output in sub-microgridpvLittle
In Δ P, the most sub-microgrid, photovoltaic output increases Δ Ppv, now Tie line Power residual accommodation amount is Δ P-Δ Ppv,
Now remainder is responsible for offer by the energy-storage units in sub-microgrid.
Fig. 4 is micro-capacitance sensor group experimental waveform figure when accessing unbalanced load, and in Fig. 4, (a) is to be loaded with in micro-capacitance sensor 1
Merit power and reactive power oscillogram；B () is interconnection exchange active power and the reactive power ripple of single-phase micro-capacitance sensor 3,4 and 5
Shape figure；C () and (d) is load voltage and current waveform in micro-capacitance sensor 1；E () is load voltage degree of unbalancedness.When t=0.3s
Micro-capacitance sensor 1 adds suddenly unbalanced load (RA=RC=7 Ω, LA=LC=5mH, RB=3 Ω, LB=3mH), permissible by (b)
Find out, owing in unbalanced load, the power of B phase is bigger than normal, so the interconnection active power of micro-capacitance sensor 4 correspondingly increases, to answer
By (e), change to load, can be seen that the degree of unbalancedness of load voltage is about 0.7% after adding unbalanced load, this
Being to meet in the quality of power supply requirement to voltage unbalance factor, this experiment shows that control strategy that this report proposed is in reply
During unbalanced load, it is possible to obtain preferable voltage-controlling effect.
Claims (5)
1. double-deck micro-capacitance sensor group's voltage control method, the steps include:
(1) gather micro-capacitance sensor group's voltage, power information, judge voltage unbalance factor according to power information；
(2) when voltage unbalance factor is < when 1%, by ground floor control action, it is ensured that the voltage power quality of micro-capacitance sensor group；
(3) when voltage unbalance factor > 1% time, by ground floor control and the second layer control act on simultaneously, ground floor control base
On plinth, the second layer controls by dominant eigenvalues regulated quantity between regulation micro-capacitance sensor thus reaches to improve the mesh of voltage unbalance factor
Mark.
One the most according to claim 1 double-deck micro-capacitance sensor group's voltage control method, it is characterised in that step (1)
In Voltage unbalance computational methods:
Wherein,Va、VbAnd VcRepresent the phase voltage amplitude of A, B and C three-phase, V respectivelyavgFor three-phase phase voltage
The meansigma methods of amplitude.
One the most according to claim 1 double-deck micro-capacitance sensor group's voltage control method, it is characterised in that step (2)
The control strategy that middle ground floor controls:
The quasi-ratio resonant controller transmission function of design is:
This layer of voltage control strategy is to utilize inverter fed voltage with regulation AC voltage to ensure stablizing of output voltage,
It uses the double-loop control scheme of outer voltage current inner loop, and realizes under α β coordinate system；Double control ring all uses quasi-ratio
Resonant controller, Control of Voltage outer shroud is stablized AC side of converter voltage magnitude and frequency, and is determined α axle and β shaft current reference
Value, electric current controls internal ring and realizes the quick tracking of electric current according to the current reference value that outer voltage provides；Wherein: s is complex frequency domain
Operator, ω1For the angular frequency of line voltage, ωcFor an angular frequency relevant to high gain region bandwidth, KPWith KRBe as the criterion ratio
Resonance control coefrficient, α and β is two coordinate axess of coordinate system.
One the most according to claim 1 double-deck micro-capacitance sensor group's voltage control method, it is characterised in that step (3)
The regulated quantity computing formula of the Tie line Power of middle micro-capacitance sensor group's bus A, B, C three-phase and single-phase micro-capacitance sensor:
ΔP1=Pa-min(Pa,Pb,Pc)
ΔP2=Pb-min(Pa,Pb,Pc)
ΔP3=Pc-min(Pa,Pb,Pc)
Wherein, Pa、PbAnd PcRepresent the single-phase output of micro-capacitance sensor group bus A, B, C respectively；ΔP1、ΔP2With Δ P3Table respectively
Show the regulated quantity of micro-capacitance sensor group's bus A, B, C three-phase and the Tie line Power of single-phase micro-capacitance sensor.
One the most according to claim 1 double-deck micro-capacitance sensor group's voltage control method, it is characterised in that step (3)
In the Tie line Power regulated quantity of each single-phase micro-capacitance sensor be first defeated by changing the photovoltaic power in each single-phase micro-capacitance sensor
Output meets the regulated quantity of Tie line Power, if photovoltaic output can not meet, then recalls energy storage, passes through photovoltaic
With jointly acting on the regulated quantity meeting Tie line Power of energy storage.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508298A (en) * | 2017-09-28 | 2017-12-22 | 合肥工业大学 | A kind of micro-capacitance sensor unbalance voltage hierarchy optimization control method |
| CN108832655A (en) * | 2018-06-14 | 2018-11-16 | 广西电网有限责任公司电力科学研究院 | A kind of control method of micro-capacitance sensor and micro-capacitance sensor group |
| CN109638890A (en) * | 2019-01-22 | 2019-04-16 | 电子科技大学 | A kind of direct-current micro-grid group system and its Novel layered control method |
| CN109842137A (en) * | 2019-03-15 | 2019-06-04 | 三峡大学 | A kind of control method for coordinating of list three-phase mixed connection microgrid group |
| CN110752617A (en) * | 2019-10-14 | 2020-02-04 | 大连理工大学 | Micro-grid construction method taking sub-functional sub-micro-grid as self-balancing unit |
| CN113363962A (en) * | 2021-05-07 | 2021-09-07 | 国家电网有限公司 | Microgrid interconnection line power hierarchical control method, system, terminal and medium |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107508298A (en) * | 2017-09-28 | 2017-12-22 | 合肥工业大学 | A kind of micro-capacitance sensor unbalance voltage hierarchy optimization control method |
| CN107508298B (en) * | 2017-09-28 | 2020-03-17 | 合肥工业大学 | Hierarchical optimization control method for unbalanced voltage of micro-grid |
| CN108832655A (en) * | 2018-06-14 | 2018-11-16 | 广西电网有限责任公司电力科学研究院 | A kind of control method of micro-capacitance sensor and micro-capacitance sensor group |
| CN109638890A (en) * | 2019-01-22 | 2019-04-16 | 电子科技大学 | A kind of direct-current micro-grid group system and its Novel layered control method |
| CN109842137A (en) * | 2019-03-15 | 2019-06-04 | 三峡大学 | A kind of control method for coordinating of list three-phase mixed connection microgrid group |
| CN109842137B (en) * | 2019-03-15 | 2022-05-06 | 三峡大学 | Coordination control method for single-phase and three-phase series-parallel micro-grid group |
| CN110752617A (en) * | 2019-10-14 | 2020-02-04 | 大连理工大学 | Micro-grid construction method taking sub-functional sub-micro-grid as self-balancing unit |
| CN110752617B (en) * | 2019-10-14 | 2022-11-18 | 大连理工大学 | Micro-grid construction method taking sub-functional sub-micro-grid as self-balancing unit |
| CN113363962A (en) * | 2021-05-07 | 2021-09-07 | 国家电网有限公司 | Microgrid interconnection line power hierarchical control method, system, terminal and medium |
| CN113363962B (en) * | 2021-05-07 | 2023-03-07 | 国家电网有限公司 | Microgrid interconnection line power hierarchical control method, system, terminal and medium |
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