CN106130026B - A kind of micro-capacitance sensor group's voltage control method of double-layer structure - Google Patents
A kind of micro-capacitance sensor group's voltage control method of double-layer structure Download PDFInfo
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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
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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
- H02J3/26—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
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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
- 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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Abstract
The invention discloses a kind of micro-capacitance sensor group's voltage control methods of double-layer structure.For the micro-capacitance sensor group of cascaded structure, voltage unbalance factor is divided into two regions in this method, when voltage unbalance factor is smaller, by first layer control action；When voltage unbalance factor is larger, start second layer control, collective effect is controlled by first layer control and the second layer.First layer control is controlled using quasi- ratio resonance, acts on the main power source in micro-capacitance sensor group.Tie line Power of the second layer control action in micro-capacitance sensor group.This method can effectively keep the voltage stabilization of micro-capacitance sensor group, and can obtain preferable control effect when handling micro-capacitance sensor group's Voltage unbalance.
Description
Technical field
The invention belongs to the controls of the voltage of micro-capacitance sensor group, are related to a kind of micro-capacitance sensor group's voltage control method of double-layer structure.
Background technology
Micro-capacitance sensor is the new electric energy supply scheme in power distribution network end, can effectively dissolve interval and distributed power generation goes out
Power, and improve customer power supply reliability.Required mesolow distribution wire is mutually supplied when there is interconnection between multiple adjacent micro-capacitance sensors
Lu Shi forms micro-capacitance sensor group system, abbreviation micro-capacitance sensor group.Micro-capacitance sensor group is the in-depth and continuity of micro-capacitance sensor.Micro-capacitance sensor group exists
Mountain area, outlying village, island group, urban power distribution network end etc. have broad application prospects, and are worth further investigation.
It finds by prior art documents, document《More micro-grid system hierarchical coordinative controls of series connection and parallel-connection structure
System strategy》(court of a feudal ruler Zhou Niancheng, Jin Ming, Wang Qianggang, Su Shi, Yan Yu connects and more micro-grid system hierarchical coordinatives of parallel-connection structure control
Tactful [J] Automation of Electric Systems .2013；37(12):13-8.) according between more microgrids series connection and networking structure in parallel, if
More micro-grid system two-stage hierarchical control schemes of series and parallel different structure are counted.For the dominant eigenvalues control of more micro-grid systems
System, the switching of grid-connected and island mode, propose the cooperation strategy between more microgrid central controllers of series and parallel structure.Text
It offers《Autonomous Model micro-capacitance sensor group's multiple elements design energy storage system capacity configuration method》(field Baconic, Xiao Xi, Ding Ruoxing, yellow show fine jade are autonomous
Type micro-capacitance sensor group multiple elements design energy storage system capacity configuration method [J] Automation of Electric Systems .2013 (01):168-73.) examine
Consider energy type energy-storage system supplement ceiling capacity vacancy and the maximum excess energy of absorption, power-type energy-storage system stabilize maximum work
Rate fluctuates, it is proposed that the capacity configuration side of different type 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, using micro-grid load on-site elimination maximize and micro-capacitance sensor between exchange minimum power as target, realize 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:
A kind of multi-objective optimization algorithm 208-16.) is proposed for micro-capacitance sensor group, with operating cost, voltage deviation and feeder line are crowded
Degree is optimization aim.
Above with respect to the research of micro-capacitance sensor group, it is concentrated mainly in terms of coordinating control, capacity configuration and optimization operation, rarely has
Analysis and research to the Voltage unbalance situation occurred when micro-capacitance sensor group's off-grid operation.For the above deficiency, the present invention proposes
A kind of voltage control method of double-layer structure, this method can effectively keep the voltage stabilization of micro-capacitance sensor group, and micro- handling
Preferable control effect can be obtained when power grid group's Voltage unbalance.
Invention content
The purpose of the present invention is to solve above-mentioned the shortcomings of the prior art, a kind of double-layer structure is provided
Voltage control method can be handled micro-capacitance sensor group's voltage imbalance question and also can while keeping micro-capacitance sensor group's voltage stabilization
Obtain preferable control effect.
A kind of micro-capacitance sensor group's voltage control method of double-layer structure, step are：
(1) acquisition micro-capacitance sensor group voltage, power information calculate voltage unbalance factor according to information of voltage：
Wherein,Va、VbAnd VcThe phase voltage amplitude of A, B and C three-phase, V are indicated respectivelyavgFor three-phase
The average value of phase voltage amplitude.
(2) work as voltage unbalance factor<When 1%, by first layer control action, the transmission function of this layer of controller is：
This layer of voltage control strategy is to ensure output voltage using inverter fed voltage to adjust exchange side voltage
Stablize, uses the double -loop control scheme of outer voltage current inner loop, and realized under α β coordinate systems.Double control ring is all made of standard
Ratio resonant controller, voltage controls outer shroud and stablizes AC side of converter voltage magnitude and frequency, and determines α axis and β shaft currents
Reference value, current control inner ring realize 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 network voltage, ωcFor relevant one with high gain region bandwidth
Angular frequency, KPWith KRSubject to ratio resonance control coefrficient, α and β are two reference axis of coordinate system.
(3) work as voltage unbalance factor>When 1%, is controlled while being acted on by first layer control and the second layer, pass through second layer control
System calculates the regulated quantity of micro-capacitance sensor group busbar A, B, C three-phase and the Tie line Power of 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 PcThe single-phase output power of micro-capacitance sensor group's busbar A, B, C is indicated respectively；ΔP1、ΔP2With Δ P3Point
Not Biao Shi micro-capacitance sensor group busbar A, B, C three-phase and single-phase micro-capacitance sensor Tie line Power regulated quantity.
(4) the Tie line Power regulated quantity of each single-phase micro-capacitance sensor is handed down in each sub- microgrid by second layer control first
Photovoltaic recalls energy storage if photovoltaic output power cannot meet, by photovoltaic and the collective effect of energy storage to meet interconnection
Exchange the regulated quantity of power.
Compared with prior art, the invention has the advantages that and technique effect：For micro-capacitance sensor group, a kind of bilayer is proposed
The voltage control method of structure, and voltage unbalance factor is divided into two regions, pass through the coordination control of first layer and the second layer
System, while keeping micro-capacitance sensor group's voltage stabilization, preferable control can be also obtained for micro-capacitance sensor group voltage imbalance question
Effect.
Description of the drawings
Fig. 1 is micro-capacitance sensor group structure figure.
Fig. 2 is first layer control structure block diagram.
Fig. 3 is second layer control structure block diagram.
Fig. 4 is experimental waveform figure when micro-capacitance sensor group accesses unbalanced load.
Specific implementation mode
With reference to embodiment and attached drawing, the present invention is done and is further described in detail, 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 of 5 sub- microgrids (abbreviation microgrid), neutron microgrid 1 and son
Microgrid 2 is three-phase microgrid, and sub- microgrid 3, sub- microgrid 4 and sub- microgrid 5 are in single-phase microgrid and their nested sub- microgrids 1, respectively
Individually it is connected on A, B, C three-phase of sub- microgrid 1.Entire micro-capacitance sensor group is connected by breaker with power distribution network.When breaker disconnects,
Entire micro-capacitance sensor group is switched to islet operation.Sub- microgrid (2,3,4 and 5) is still connected in sub- microgrid 1 at this time, by sub- microgrid 1
Voltage and frequency support are provided for entire micro-capacitance sensor group.
Fig. 2 is first layer control structure block diagram, which is using inverter fed voltage to adjust exchange
Side voltage ensures the stabilization of output voltage, using the double -loop control scheme of outer voltage current inner loop.Outer voltage can protect
The stabilization of output voltage is demonstrate,proved, current inner loop, which constitutes electric current servomechanism, can greatly speed up the dynamic process voltage electricity for resisting disturbance
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 also high.Meanwhile current inner loop
Increase the bandwidth of inverter control system so that inverter dynamic response is accelerated.
The control strategy realizes that α axis and β axis are separately controlled under α β coordinate systems, the controller design complete one of two axis
It causes, inverter is modulated using SPWM.Double control ring is all made of quasi- ratio resonance control controller, and voltage controls outer shroud and stablizes unsteady flow
Device exchange side voltage magnitude and frequency, and determine α axis and β shaft current reference values.Current control inner ring is provided according to outer voltage
Current reference value realize electric current quick tracking, the amplitude and phase of output voltage are controllable.
Fig. 3 is second layer control structure block diagram, and micro-capacitance sensor group's second layer control strategy is based on first layer control strategy
Further fine tuning, to which better voltage-controlling effect can be obtained.This layer of control strategy is primarily directed to micro-capacitance sensor group's isolated island
When operation, the situation of the Voltage unbalance of appearance.As shown in figure 3, the action of this layer of control strategy is based on to micro-capacitance sensor group's electricity
Press the judgement of degree of unbalancedness.When the degree of unbalancedness of voltage<When 1%, i.e., first layer voltage control strategy is in reply micro-capacitance sensor group electricity
When pressure can obtain preferable control effect when uneven, second layer control strategy is not involved in adjusting.When the injustice of voltage
Weighing apparatus degree>When=1%, second layer control strategy starts to act, mainly by adjusting single-phase sub- microgrid 2,3 and 4 and three-phase
The Tie line Power of microgrid 1 realizes the further fine tuning to micro-capacitance sensor group's voltage.It is by being calculated sub- microgrid 2,3 and
4 with 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 adjustable amount Δ P of powerpvWhether Δ P is more than.If the adjustable amount Δ P of the photovoltaic output power in sub- microgridpvMore than etc.
In Δ P, then photovoltaic output power increases Δ P in sub- microgrid.If the adjustable amount Δ P of the photovoltaic output power in sub- microgridpvIt is small
In Δ P, then photovoltaic output power increases Δ P in sub- microgridpv, Tie line Power residual accommodation amount is Δ P- Δs P at this timepv,
Remainder is responsible for offer by the energy-storage units in sub- microgrid at this time.
Fig. 4 is experimental waveform figure when micro-capacitance sensor group accesses unbalanced load, and in Fig. 4, (a) is to load to have in micro-capacitance sensor 1
Work(power and reactive power oscillogram；(b) active power and reactive power wave are exchanged for the interconnection 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) it is load voltage degree of unbalancedness.In t=0.3s
Unbalanced load (R is added in micro-capacitance sensor 1 suddenlyA=RC=7 Ω, LA=LC=5mH, RB=3 Ω, LB=3mH), it can be with by (b)
Find out, since the power of B phases in unbalanced load is bigger than normal, so the interconnection active power of micro-capacitance sensor 4 correspondingly increases, to answer
Variation to load, by (e) it can be seen that after unbalanced load is added, the degree of unbalancedness of load voltage is about 0.7%, this
It is the requirement met in power quality to voltage unbalance factor, this experiment shows that the control strategy that this report is proposed is being coped with
When unbalanced load, preferable voltage-controlling effect can be obtained.
Claims (3)
1. a kind of micro-capacitance sensor group's voltage control method of double-layer structure, step are：
(1) acquisition micro-capacitance sensor group voltage, power information, judge voltage unbalance factor according to power information；Voltage unbalance calculates
Method：
Wherein,Va、VbAnd VcThe phase voltage amplitude of A, B and C three-phase, V are indicated respectivelyavgIt is mutually electric for three-phase
The average value of pressure amplitude value；
(2) work as voltage unbalance factor<When 1%, by first layer control action, ensure the voltage power quality of micro-capacitance sensor group；First
The control strategy of layer control：
Design quasi- ratio resonant controller transmission function be：
This layer of voltage control strategy is to ensure the stabilization of output voltage using inverter fed voltage to adjust exchange side voltage,
It uses the double -loop control scheme of outer voltage current inner loop, and is realized under α β coordinate systems；Double control ring is all made of quasi- ratio
Resonant controller, voltage controls outer shroud and stablizes AC side of converter voltage magnitude and frequency, and determines α axis and the reference of β shaft currents
Value, current control inner ring realize 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 network voltage, ωcFor with the relevant angular frequency of high gain region bandwidth, KPWith KRSubject to ratio
Resonance control coefrficient, α and β are two reference axis of coordinate system；
(3) work as voltage unbalance factor>When 1%, is controlled while being acted on by first layer control and the second layer, in the base of first layer control
On plinth, second layer control is by dominant eigenvalues regulated quantity between adjusting micro-capacitance sensor to reach the mesh for improving voltage unbalance factor
Mark.
2. a kind of micro-capacitance sensor group's voltage control method of double-layer structure according to claim 1, it is characterised in that step (3)
The regulated quantity calculation formula of middle micro-capacitance sensor group busbar A, B, C three-phase and the Tie line Power of 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 PcThe single-phase output power of micro-capacitance sensor group's busbar A, B, C is indicated respectively；ΔP1、ΔP2With Δ P3Table respectively
Show the regulated quantity of micro-capacitance sensor group busbar A, B, C three-phase and the Tie line Power of single-phase micro-capacitance sensor.
3. a kind of micro-capacitance sensor group's voltage control method of double-layer structure according to claim 1, it is characterised in that step (3)
In the Tie line Power regulated quantity of each single-phase micro-capacitance sensor be defeated by changing the photovoltaic power in each single-phase micro-capacitance sensor first
Output meets the regulated quantity of Tie line Power, if photovoltaic output power cannot meet, recalls energy storage, passes through photovoltaic
Collective effect with energy storage is to meet the regulated quantity of Tie line Power.
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| CN107508298B (en) * | 2017-09-28 | 2020-03-17 | 合肥工业大学 | Hierarchical optimization control method for unbalanced voltage of micro-grid |
| CN108832655B (en) * | 2018-06-14 | 2021-03-09 | 广西电网有限责任公司电力科学研究院 | Micro-grid and control method of micro-grid group |
| CN109638890B (en) * | 2019-01-22 | 2022-08-30 | 电子科技大学 | Direct-current micro-grid group system and hierarchical control method thereof |
| 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 |
| 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 |
| 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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| "基于自适应负序电流虚拟阻抗的微电网不平衡控制策略";马添翼等;《电力***自动化》;20140625;第38卷(第12期);第12-18页 * |
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