CN106026188B - A kind of micro-capacitance sensor active synchronization control method based on distributed AC servo system - Google Patents
A kind of micro-capacitance sensor active synchronization control method based on distributed AC servo system Download PDFInfo
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- CN106026188B CN106026188B CN201610325592.3A CN201610325592A CN106026188B CN 106026188 B CN106026188 B CN 106026188B CN 201610325592 A CN201610325592 A CN 201610325592A CN 106026188 B CN106026188 B CN 106026188B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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Abstract
The micro-capacitance sensor active synchronization control method based on distributed AC servo system that the invention discloses a kind of, it is characterised in that：Using distributed control technology, micro-grid system busbar voltage is actively adjusted by local message interaction, realizes micro-capacitance sensor seamlessly transitting from islet operation pattern to the pattern of being incorporated into the power networks.The synchronous correction signal generated in isochronous controller passes only to lead micro- source, the micro- source of leader again with neighbouring micro- source interactive information.Meanwhile also adjacent micro- source is exchanged with each other information in other micro- sources.Finally, all micro- sources reach that consistent sexual behaviour i.e. voltage is consistent with frequency, reactive power proportional assignment, and micro-grid system busbar voltage will be synchronouss with bulk power grid, and realization is seamless grid-connected.Compared with traditional synchronous method, the present invention is based on local sparse communications, do not need complex communications networks, reduce cost, improve system reliability, flexibility and redundancy.Also, even if distributed communication network breaks down, bottom droop control still can guarantee system normal operation.
Description
Technical field
The present invention relates to distributed power generation, micro-capacitance sensor technical fields, and in particular to a kind of micro- electricity based on distributed AC servo system
Host moves synchronisation control means.
Background technology
Effective carrier of the micro-capacitance sensor as distributed generation resource, including various forms of micro- sources, energy storage device, energy converting means
It sets, the equipment such as protective device and load monitoring, is that by self-contr ol, protection and the compact electrical generating systems of management, has
There are isolated island and grid-connected two kinds of operational modes.The it is proposed of micro-capacitance sensor is the reliability for improving power system power supply, efficiently use can be again
The raw energy, and reduce environmental pollution and electric energy loss etc. and provide new effective way.
Bulk power grid refers to more than power plant's quantity that total capacity is big, power supply area coverage is big, is fed to power grid and various informative, power grid
The high and contained voltage class of itself highest voltage level is more, alternating current-direct current is the same as more than, the user and the complicated complexity journey such as various of demand
Spend high large-scale power system.
Under normal circumstances, micro-capacitance sensor is incorporated into the power networks with bulk power grid, when bulk power grid breaks down or power quality is unsatisfactory for bearing
When lotus requires, micro-capacitance sensor needs quickly, initiatively to disconnect with bulk power grid, is transitioned into island operation state, important in microgrid to ensure
The lasting reliable power supply of load.It is possible that larger voltage, electric current during islet operation pattern switching to grid-connect mode
Impact phenomenon, these phenomenons can have an adverse effect to power grid, load and inverter, cause the power failure of important load.Cause
Seamless switching between this isolated island and the pattern that is incorporated into the power networks is to realize micro-grid system operation diversification, meet user's diversification electric power
It services, the necessary guarantee of the uninterrupted power supply of important load.And to realize microgrid from isolated island to the smoothed of the pattern of being incorporated into the power networks
It crosses, reduces grid-connected impact, active synchronization control method is most important.
Traditional quasi- simultaneous interconnecting control method can only solve the problems, such as that single micro- source is grid-connected, for the distribution containing high permeability
The traditional method of network-type micro-capacitance sensor of source composition of declining no longer is applicable in.Most of micro-grid connection synchronous method at present,
Its thinking is essentially two kinds in it can read up the literature：One is the differences for detecting external electrical network voltage and micro-capacitance sensor voltage first, so
The micro-capacitance sensor for having frequency modulation and pressure regulation ability inside micro-capacitance sensor is controlled in such a way that frequency and voltage are adjusted low-speed communication afterwards
Inverter adjusts micro-capacitance sensor voltage, and, this synchronous method and traditional quasi- simultaneous interconnecting control synchronous with bulk power grid is done step-by-step
Method is all that only considered the grid-connected problems of Dan Weiyuan；Another kind is solved containing mostly micro- to each micro- source using concentration communication broadcast information
The micro-grid connection problem in source.But central controlled communication line is long, of high cost, reliability is low, and central controlled side
Method is applied to be distributed the network-type micro-capacitance sensor in the source that declines containing high permeability to be unpractical.Therefore the distribution containing high permeability declines
The grid-connected synchronous control of the micro-capacitance sensor in source is faced with huge challenge.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art, propose that a kind of micro-capacitance sensor based on distributed AC servo system is actively same
Control method is walked, realizes micro-capacitance sensor isolated island taking over seamlessly to the pattern of being incorporated into the power networks.
To achieve the above object, technical scheme is as follows：
A kind of micro-capacitance sensor active synchronization control method based on distributed AC servo system, the micro-capacitance sensor include that several distributions decline
Source DG, n busbar, transmission line, load, grid-connected switch, isochronous controller, communication network, it is described it is several distribution decline source it
Between be connected in parallel, several distribution sources that decline are connected to by respective feeder line on the busbar, several distributions decline
Source, which is divided into, to be led micro- source 1012 i.e. " leader " and follows micro- source 1011 i.e. " follower ", and the isochronous controller 1020 is used for producing
Raw synchronous control signal, the communication network are distributed communication network, the synchronous control signal that isochronous controller 1020 generates
It is transferred only to lead micro- source 1012, leads micro- source 1012 with positioned at neighbouring micro- source shared information of neighbor location, follow micro- source
1011 also with neighbouring micro- source interactive information positioned at neighbor location, and final all micro- sources reach consistent sexual behaviour i.e. voltage and frequency
Rate is consistent, reactive power is divided in portion, and micro-capacitance sensor and bulk power grid points of common connection PCC point voltages are synchronous with bulk power grid, specifically
Step includes：
(1) when bulk power grid breaks down or power quality is unsatisfactory for burden requirement, micro-capacitance sensor quickly, initiatively with big electricity
Net disconnects, and is in islet operation pattern, and micro-source inverter uses droop control at this time；
(2) after bulk power grid voltage restores normal, isochronous controller starts presynchronization algorithm, carries out active synchronization control；
(3) the distance between generating capacity, sagging coefficient and micro- source in comprehensive each micro- source and PCC points, it is micro- to choose leader
Source；
(4) information received according to the micro- source of leader, isochronous controller adjust each micro- source output using distributed control method
Voltage, frequency, it is synchronous with bulk power grid to adjust PCC point voltages；
(5) when PCC point voltages meet micro-grid connection standard, isochronous controller sends out order, makes grid-connected switch 1030
Automatic to be closed, then micro-capacitance sensor is by islet operation pattern switching to the pattern of being incorporated into the power networks.
The micro- source of leader and neighbouring micro- source shared information, other micro- sources also refer to neighbouring micro- source in neighbouring micro- source interactive information
Be in distributed control method be located at neighbor location micro- source.For example, for micro- source 1 in Figure 11：Micro- source 2 and micro- source 4 are micro-
Neighbouring micro- source in source 1, micro- source 3 is not neighbouring micro- source in micro- source 1, with micro- source 1 without communication line so that letter can not be carried out with micro- source 1
Breath interaction；For micro- source 4：Micro- source 1, micro- source 2, micro- source 3 are all neighbouring micro- sources in micro- source 1, can all be handed over into row information with micro- source 1
Mutually.
In step (1), when micro-capacitance sensor is in islet operation pattern, micro-source inverter uses droop control method, mainly
Control targe be maintain microgrid in voltage, frequency stabilization and proportional assignment bearing power, voltage, frequency droop governing equation
For：
ωi=ω*-miPi
Vi=V*-niQi
Wherein, ω*、V*The angular frequency and voltage magnitude of respectively micro- source output voltage under zero load, ωi、ViRespectively
The angular frequency and voltage magnitude reference value of i micro- source actual output voltages, Pi、QiThe active and nothing of respectively i-th micro- source output
Work(power, mi、niThe sagging coefficient of respectively i-th micro- source frequency sagging (P- ω) and voltage sagging (Q-V).
Presynchronization control algolithm in step (2) is included in isochronous controller 1020, it is contemplated that voltage vector cross product energy
Reflect frequency and phase angular displacement simultaneously, bulk power grid voltage and PCC point instantaneous voltages are subjected to calculated crosswise first, calculates voltage
Then amplitude error adjusts PCC points voltage, frequency and phase angle simultaneously by same PI controllers；
Voltage vector cross product is as follows：
eθ=-vgαvcβ+vgβvcα
Voltage magnitude error is expressed as follows：
Wherein vgα、vcαRespectively bulk power grid voltage and PCC point voltage α axis components, vgβ、vcβRespectively bulk power grid voltage and
PCC point voltage beta -axis components；
eθ、eUPI controls are respectively adopted and generate synchronous correction signalWithIts expression formula is：
Wherein kps、kisRespectively PI controllers proportionality coefficient and integral coefficient, kpvs、kivsRespectively PI controllers ratio
Coefficient and integral coefficient.
In step (3), the distance between generating capacity, sagging coefficient and micro- source in comprehensive each micro- source and PCC points are chosen
The micro- source principle of leader is：It is the micro- source of leader to choose micro- source that generating capacity is big, sagging coefficient is small, close with PCC point distances, and generate electricity energy
Then sagging coefficient is small greatly for power, so only needing COMPREHENSIVE CALCULATING generating capacity and at a distance from PCC points, such as calculates each micro- source power generation
Ability numeric value and ratio with the distance values of PCC points, it is the micro- source of leader to choose the big micro- source of ratio.
In step (4), distributed collaboration control problem is generally divided into two classes：Convergent control, that is, consistency problem of no leader
And the distributed tracking problem with leader, the present invention use the distributed tracking control method with leader, according to
The consistency protocol of earlier set, all " follower " follow the state asymptotic tracking " leader " in micro- source to lead micro- source
State, respective output frequency, voltage magnitude are adjusted, to reduce the phase angle difference and voltage magnitude of grid-connected switch ends voltage
Difference, until PCC point voltages and bulk power grid voltage synchronous；
The present invention is solved the problems, such as again grid-connected after micro-capacitance sensor isolated island using distributed collaboration control method, and this method is using dilute
Dredging letter, only leading micro- source to obtain, the synchronous correction signal generated in isochronous controller, each micro- source need to only be obtained adjacent to micro-
Source information, therefore, communication line is short out, investment reduction and operating cost, system reliability are high；
For micro- source DG-i is followed, is controlled into line frequency and adjusted using distributed collaboration, its consistency agreement is as follows：
ωi=ω*-miPi+Δωi
Wherein, Δ ωiFor the control variable in i-th of micro- source, kwFor postiive gain coefficient, aijIt indicates between micro- source i and micro- source j
Connection weight, aij＞ 0 indicates that micro- source i receives the information of micro- source j；
For the micro- source DG-k of leader, synchronous correction signalIt is added to Δ ωk, governing equation is：
ωk=ω*-mkPk+Δωk
Wherein, b is normal number；
The derivative of all Δ ω is 0 when stable state, and the Δ ω in all micro- sources is equal, that is, it is same to ensure that all micro- sources have
Frequency shift (FS)；
It is using distributed collaboration control adjustment voltage magnitude, governing equation in active synchronization control method：
Wherein, Δ ViVariable in order to control, βiFor synchronous correction signalYield value, bijIndicate micro- source i and micro- source j it
Between reactive power adjust weight, bij＞ 0 indicates that micro- source i receives reactive power information from micro- source j；kQj、kQiRespectively micro- source j and
Micro- source i reactive powers divide equally control coefrficient, kvFor postiive gain coefficient；
For the micro- source DG-k of leader：βk＞ 0, bkj=0, for following micro- source DG-i：βi=0, bij=1, the micro- source of leader is negative
Duty adjusts PCC point voltages, and other micro- source control reactive powers respectively adjust output voltage indirectly, using distributed AC servo system, no
It only reaches reactive power proportional assignment and ensures PCC point voltage magnitudes and bulk power grid voltage synchronous；
Isochronous controller detects bulk power grid voltage and PCC points voltage, that is, grid-connected switch ends voltage, is produced by synchronized algorithm
Raw synchronous correction signalWithThese signals are transferred only to lead micro- source, by the consistency protocol of foundation, thus
It is formed between micro- source and leads-follow relationship, finally so that vc=vg；Under island mode, all micro- sources are all made of droop control conduct
One secondary control improves the robustness of system, maintains distributed frame at this time, and the distributed collaboration control proposed can carry out
Electric voltage frequency restores and ensures that the accurate of reactive power is divided equally.
In step (5), when PCC point voltages meet micro-grid connection standard, isochronous controller sends out order, makes grid-connected open
Close it is automatic be closed, micro-capacitance sensor by islet operation pattern switching to the pattern of being incorporated into the power networks, due to the micro- source fast response time of inverter type,
Low inertia, overload capacity are poor, in order to avoid big rush of current, reach smooth grid-connected, and micro-capacitance sensor needs stringenter grid-connected
Standard, Grid-connection standards of the present invention include:PCC point voltages meet | fg-fc|≤0.05HZ, | Vg-Vc|≤3%Vn,After three formula and persistently 200ms, isochronous controller sends out order, and grid-connected switch is closed, wherein fgTable
Show bulk power grid frequency, fcIndicate PCC dot frequencies, VgIndicate bulk power grid voltage magnitude, VcIndicate that PCC point voltage magnitudes, Vn indicate mark
Quasi- voltage,Indicate bulk power grid phase angle,Indicate PCC point phase angles.
Beneficial effects of the present invention are：
The present invention has simultaneously provided a kind of new method to be distributed the network-type micro-grid connection in the source that declines containing Thief zone.With
The prior art is compared, and this method advantage is：
1, ensure micro-capacitance sensor taking over seamlessly from islet operation pattern to the pattern of being incorporated into the power networks.
2, micro- source is led to have higher weighted value, PCC point voltages to be dominated by the micro- source of leader in the characteristic for determining PCC points,
Therefore, the presynchronization time is not limited by microgrid topology structure.
3, under island mode, distributed collaboration control can be used for restoring frequency, voltage and maintain power-sharing.
4, the method proposed can be extended to the pattern of being incorporated into the power networks, and form simultaneously off-network Unified Control Strategy, solve micro- electricity
Switching problem between net different mode.
5, it using distributed AC servo system, avoids using central controller, is based on local communication, communication line is short out, at low cost, carries
High system reliability, scalability, flexibility have point-to-point function, even if distributed network failure, system remain to robust
Operation.
Description of the drawings
Fig. 1 is the microgrid topology structure schematic diagram that the present invention uses distributed communication；
Fig. 2 is the micro- source control block diagram of inverter type of the present invention；
Fig. 3 is that synchronous correction signal of the present invention generates schematic diagram；
Fig. 4 (a) is the sagging output characteristics that distributed AC servo system of the present invention starts front and back P- ω droop controls；
Fig. 4 (b) is the sagging output characteristics that distributed AC servo system of the present invention starts front and back Q-V droop controls；
Fig. 5 is that the present invention is based on the active synchronization method entirety control block diagrams of distributed AC servo system；
Fig. 6 is the micro-grid connection standard that the micro- source capacity of the present invention is 0-500kVA；
Fig. 7 is micro-grid system simulation model of the present invention；
Fig. 8 is the active synchronization method simulation waveform proposed by the invention based on distributed AC servo system；
System emulation waveform when Fig. 9 is communication line failure of the present invention；
Figure 10 is the flow chart of the micro-capacitance sensor active synchronization control method embodiment based on distributed AC servo system of the present invention；
Figure 11 is the information interaction schematic diagram in micro- source.
Specific implementation mode
Technical scheme of the present invention is described in detail below in conjunction with the accompanying drawings, but not limited to this.
Fig. 1 be the present invention use distributed communication microgrid topology structure schematic diagram, including it is several distribution decline source DG,
N busbar, transmission line, load, grid-connected switch 1030, isochronous controller 1020, communication network, several distributions decline source
Between be connected in parallel, be connected on the busbar by respective feeder line, several distribution sources of declining are divided into the micro- source of leader
1012 and follow micro- source 1011, the isochronous controller 1020 is used for generating synchronous control signal, and the communication network is distribution
Formula communication network, the synchronous control signal that isochronous controller 1020 generates are transferred only to lead micro- source 1012, the micro- source of leader 1012
With the neighbouring micro- source shared information of itself, also with neighbouring micro- source interactive information, final all micro- sources reach consistent in other micro- sources
Sexual behaviour, that is, voltage is consistent with frequency, reactive power proportional assignment, micro-capacitance sensor and bulk power grid points of common connection PCC point voltages with
Bulk power grid synchronizes.
The control method of the present invention specifically comprises the following steps：
(1) when bulk power grid breaks down or power quality is unsatisfactory for burden requirement, micro-capacitance sensor quickly, initiatively with big electricity
Net disconnects, and is in islet operation pattern, and micro-source inverter uses droop control at this time.
When islet operation pattern, micro-source inverter, which uses droop control method, main control targe, to be maintained in microgrid
Voltage, frequency stabilization and proportional assignment bearing power, voltage, frequency droop governing equation are：
ωi=ω*-miPi
Vi=V*-niQi
Wherein, ω*、V*The angular frequency and voltage magnitude of respectively micro- source output voltage under zero load, ωi、ViRespectively
The angular frequency and voltage magnitude reference value of i micro- source actual output voltages, Pi、QiThe active and nothing of respectively i-th micro- source output
Work(power, mi、niThe sagging coefficient of respectively i-th micro- source frequency sagging (P- ω) and voltage sagging (Q-V).It is controlled in detail
Block diagram as shown in Fig. 2, include power control loop 201, voltage control loop 202, current regulator 203 and virtual impedance ring 204, when
When circuit is resistance sense type, start virtual impedance ring 204, decouples active and reactive power.
(2) after bulk power grid voltage restores normal, isochronous controller 1020 starts presynchronization algorithm, carries out active synchronization control
System.
Synchronized control targe is to eliminate the error of PCC point voltage and bulk power grid voltage, that is, grid-connected switch
Frequency, phase angle and the amplitude of both sides voltage must satisfy Grid-connection standards.The presynchronization control algolithm of the present invention is included in described same
It walks in controller, it is contemplated that voltage vector cross product can reflect frequency and phase angular displacement simultaneously, therefore by bulk power grid voltage and PCC points
Instantaneous voltage carries out calculated crosswise, calculates voltage magnitude error, then adjusts PCC point voltages simultaneously by same PI controllers
Frequency and phase angle, voltage vector cross product are as follows：
eθ=-vgαvcβ+vgβvcα
Voltage magnitude error is expressed as follows：
Wherein vgα、vcαRespectively bulk power grid voltage and PCC point voltage α axis components, vgβ、vcβRespectively bulk power grid voltage and
PCC point voltage beta -axis components.
eθ、eUPI controls are respectively adopted and generate synchronous correction signalWithAs shown in figure 3, its expression formula is：
Wherein kps、kisRespectively PI controllers proportionality coefficient and integral coefficient, kpvs、kivsRespectively PI controllers ratio
Coefficient and integral coefficient.
(3) generating capacity in comprehensive each micro- source, sagging coefficient and the distance between micro- source and PCC, choose and lead micro- source,
Choosing the micro- source principle of leader is：It is the micro- source of leader to choose micro- source that generating capacity is big, sagging coefficient is small, close with PCC point distances.
Then sagging coefficient is small greatly for generating capacity, so only needing COMPREHENSIVE CALCULATING generating capacity and at a distance from PCC points.Such as it counts
Each micro- source generating capacity numerical value and the ratio with the distance values of PCC points are calculated, it is the micro- source of leader to choose the big micro- source of ratio.
(4) distributed control method is used to adjust each micro- source output voltage, frequency, to adjust PCC point voltages and big electricity
Net synchronizes.
Distributed collaboration control problem is generally divided into two classes：Convergent control, that is, consistency problem of no leader and with neck
The distributed tracking problem for the person of leading.In isolated island micro-capacitance sensor, there is identical steady-state value in all micro- sources, belong to convergent control problem；
During presynchronization control, the micro- source of leader follows bulk power grid, other micro- sources follow the micro- source of leader, belong to distributed tracking problem.
Micro-capacitance sensor communication topology is generally described using figure, and a micro- source is considered as a node.With figure G (ν, ε, A) come indicate node it
Between information exchange relationship, G (ν, ε, A) is by node set ν={ 1,2, n } of nonempty finite, side collection ε ν ν and adjacent square
Battle array A=[aij] R R expressions.Definition node (i, j) ν of the present invention indicates that node i receives information from node j, for arbitrary (i, j)
ν, aij0, and if (i, j) ν, have (j, i) ν, at this time aij=aji。
The present invention uses the distributed tracking control method with leader, according to the consistency protocol of earlier set, institute
" follower " having follows the state asymptotic tracking " leader " in micro- source to lead the state in micro- source, adjusts respectively output frequency
Rate, voltage magnitude, to reduce the phase angle difference and voltage amplitude value difference of grid-connected switch ends voltage, until PCC point voltages and big electricity
Net voltage synchronous.
The present invention is solved the problems, such as again grid-connected after micro-capacitance sensor isolated island using distributed collaboration control method, is avoided using center
Controller, this method utilize sparse communication, only lead the synchronous correction signal generated in micro- source acquisition isochronous controller, is each
Micro- source need to only obtain neighbouring micro- source information, and therefore, communication line is short out, investment reduction and operating cost, system reliability are high.
For micro- source DG-i is followed, is controlled into line frequency and adjusted using distributed collaboration, its consistency agreement is as follows：
ωi=ω*-miPi+Δωi
Wherein, Δ ωiFor the control variable in i-th of micro- source, kwFor postiive gain coefficient, aijIt indicates between micro- source i and micro- source j
Connection weight, aij＞ 0 indicates that micro- source i receives the information of micro- source j.
For the micro- source DG-k of leader, by synchronous correction signalIt is added to Δ ωk, governing equation is：
ωk=ω*-mkPk+Δωk
Wherein, b is normal number.
The derivative of all Δ ω is 0 when stable state, and the Δ ω in all micro- sources is equal, that is, it is same to ensure that all micro- sources have
Frequency shift (FS).Fig. 4 (a) is the sagging output characteristics that distributed AC servo system starts front and back P- ω droop controls, and distributed AC servo system will
All micro- source curve liftings are identical to be worth until micro-capacitance sensor output voltage angular frequency is consistent with bulk power grid.
It is using distributed collaboration control adjustment voltage magnitude, governing equation in active synchronization control method：
Wherein, Δ ViVariable in order to control, βiFor synchronous correction signalYield value, bijIndicate micro- source i and micro- source j it
Between reactive power adjust weight, bij＞ 0 indicates that micro- source i receives reactive power information from micro- source j；kQj、kQiRespectively micro- source j and
Micro- source i reactive powers divide equally control coefrficient, kvFor postiive gain coefficient, for the micro- source DG-k of leader：βk＞ 0, bkj=0, for
With micro- source DG-i：βi=0, bij=1, leader is responsible in micro- source adjusting PCC point voltages, and between following micro- source control reactive power to divide equally
Connect adjusting output voltage.Using distributed AC servo system, reactive power proportional assignment is not only reached and ensures PCC point voltage magnitudes
With bulk power grid voltage synchronous.Fig. 4 (b) describes the reactive power distribution condition in two micro- sources of parallel connection using Q-V droop controls,
Circuit Xline-1＞ Xline-2.By Fig. 4 (b) it is found that can not ensure that reactive power is divided equally only with traditional droop control, start distribution
Voltage recovery can be not only carried out after formula control so that micro-grid connection busbar voltage is synchronous with bulk power grid, while ensureing idle
Power is divided in portion.
Fig. 5 is the present invention is based on the active synchronization method entirety control block diagram of distributed AC servo system, and isochronous controller detection is big
Network voltage vgWith PCC point voltages vcI.e. grid-connected switch ends voltage generates synchronous correction signal by synchronized algorithmWithThese signals are transferred only to lead micro- source, are formed by the consistency protocol of foundation, between micro- source and lead-follow pass
System, PCC point voltages are adjusted by changing itself output voltage, finally so that vc=vg.Under island mode, all micro- sources are adopted
The robustness for improving system as a secondary control with droop control, maintains distributed frame at this time, the distributed association proposed
Electric voltage frequency recovery can be carried out with control and ensures that the accurate of reactive power is divided equally.
(5) when PCC point voltages meet micro-grid connection standard, isochronous controller sends out order, keeps grid-connected switch automatic
It is closed, micro-capacitance sensor is by islet operation pattern switching to the pattern of being incorporated into the power networks, due to the micro- source fast response time of inverter type, low used
Property, overload capacity it is poor, in order to avoid big rush of current, reach smooth grid-connected, micro-capacitance sensor needs stringenter Grid-connection standards.
The Grid-connection standards that the present invention uses are as shown in fig. 6, difference on the frequency, voltage amplitude value difference and phase angle difference to grid-connected switch ends are made sternly
The limitation of lattice.
Fig. 7 is embodiment micro-grid system simulation model, including the identical micro- source 7011 and 7012 of 4 capacity, local negative
Carry 7030 and common load 7040, line impedance 7050, grid-connected switch 7020.DG1 is the micro- source 7011 of leader, receives synchronous control
Signal, all micro- adjacent micro- source interactive information in source, adjacency matrix A=[aij], B=[bij] be respectively：
When t=0s, micro-capacitance sensor disconnects with bulk power grid and is in islet operation pattern, at this time only with droop control.T=1s
When, start distributed collaboration control, when PCC point voltages and bulk power grid electric voltage frequency is poor, phase angle difference and voltage amplitude value difference reach micro-
When power grid Grid-connection standards, grid-connected switch is closed.Simulation waveform is as shown in Figure 8.
After starting the synchronisation control means proposed, PCC points and bulk power grid instantaneous voltage difference Δ v are gradually reduced, when PCC point electricity
When voltage-frequency rate, phase angle and voltage magnitude meet micro-grid connection standard as shown in FIG. 6, it is closed grid-connected switch 7020.By Fig. 8
(d) shown in-(h), grid-connected current impact is smaller, has reached and has taken over seamlessly.By Fig. 8 (a)-(c) as it can be seen that the side of synchronization proposed
Method, which can not only restore micro-grid system voltage, frequency, can also ensure that reactive power is divided equally.
Flexibility and the redundancy that the communication between micro- source DG2 and DG3 will be followed to disconnect verification system, test communication line
Influence of the failure to system.Simulation result continues grid-connected after 200ms open as shown in figure 9, when PCC point voltages meet Grid-connection standards
It closes and closes, grid-connected current impact is smaller, and micro-capacitance sensor is switched to the pattern of being incorporated into the power networks by islet operation mode smooth.With no communication
Fault simulation is compared, be only adjustment process it is slow some, still ensure that seamlessly again grid-connected.It can be seen that the synchronous control proposed
Even if method communication failure, if system there are in one spanning tree, that is, microgrid any one follow micro- source all to there are a paths to connect
The micro- source of leader is led to, still ensures that seamless pattern switching.
Above-described embodiment is merely illustrative of the technical solution of the present invention, and not to the invention specific implementation mode
It limits.The specific implementation mode of the present invention is modified or replaced equivalently, and appointing without departing from spirit and scope of the invention
What modification or equivalent replacement, among scope of the invention as claimed.
Claims (5)
1. a kind of micro-capacitance sensor active synchronization control method based on distributed AC servo system, which is characterized in that if the micro-capacitance sensor includes
Dry distribution declines source DG, n busbar, transmission line, load, grid-connected switch, isochronous controller, communication network, described several points
Cloth decline be connected in parallel between source, several distributions sources that decline are connected to by respective feeder line on the busbar, if described
The dry distribution source of declining is divided into the micro- source of leader and follows micro- source, and the isochronous controller is used for generating synchronous control signal, described logical
Communication network is distributed communication network, and the synchronous control signal that the isochronous controller generates is transferred only to the micro- source of leader,
The micro- source of the leader with positioned at neighbouring micro- source shared information of neighbor location, it is described follow micro- source also with the neighbour positioned at neighbor location
Nearly micro- source interactive information, final all micro- sources reach that voltage is consistent with frequency, reactive power is divided in portion, the micro-capacitance sensor
It is synchronous with bulk power grid with the points of common connection PCC point voltages of bulk power grid, the method includes：
(1) when the bulk power grid breaks down or power quality is unsatisfactory for burden requirement, the micro-capacitance sensor is disconnected with bulk power grid,
In islet operation pattern, micro-source inverter is using droop control pattern at this time；
(2) after voltage or power quality meet burden requirement before the bulk power grid voltage restores failure, the isochronous controller
Start presynchronization algorithm, carries out active synchronization control；
(3) generating capacity in comprehensive each micro- source, sagging coefficient and each the distance between micro- source and the PCC points, choosing
Take the micro- source of leader；
(4) information received according to the micro- source of leader, each micro- source adjust respectively output using distributed control method
Voltage, frequency, it is synchronous with bulk power grid to adjust the PCC points voltage；
(5) when the micro-capacitance sensor voltage meets micro-grid connection standard, the isochronous controller sends out order, makes grid-connected switch
It is automatic to be closed；
Presynchronization control algolithm in the step (2) is included in the isochronous controller, and the presynchronization algorithm includes：
Formula e is used firstθ=-vgαvcβ+vgβvcαThe bulk power grid voltage and PCC point instantaneous voltages are intersected
It calculates, vgαFor the bulk power grid voltage α axis components, vcαFor the PCC points voltage α axis components；
Using formulaCalculate voltage magnitude error, vgβFor the bulk power grid voltage beta -axis component,
vcβFor the PCC points voltage beta -axis component；
Then formula is usedSynchronous correction signal is generated by PI controllersIt adjusts
Save the PCC point electric voltage frequencies and phase angle, kpsFor PI controller proportionality coefficients, kisFor PI controller integral coefficients, using formulaSynchronous correction signal is generated by the PI controllersAdjust institute
State PCC point voltage magnitudes, kpvsFor PI controller proportionality coefficients, kivsFor PI controller integral coefficients.
2. the micro-capacitance sensor active synchronization control method according to claim 1 based on distributed AC servo system, which is characterized in that institute
It states in step (1), when the micro-capacitance sensor is in islet operation pattern, micro-source inverter uses formulaIt carries out
Droop control, control targe are to maintain voltage in microgrid, frequency stabilization and proportional assignment bearing power, wherein ω*For micro- source
The angular frequency of output voltage, V under zero load*For the voltage magnitude of micro- source output voltage under zero load, ωiI-th of micro- source is actually defeated
Go out the angular frequency of voltage, ViFor the voltage magnitude reference value of i-th of micro- source actual output voltage, PiFor having for i-th of micro- source output
Work(power, QiFor the reactive power of i-th of micro- source output, miFor the sagging sagging coefficient of i-th of micro- source frequency, niIt is micro- for i-th
The sagging sagging coefficient of source frequency voltage.
3. the micro-capacitance sensor active synchronization control method according to claim 1 based on distributed AC servo system, which is characterized in that institute
Step (3) is stated to specifically include：It is micro- for leader to choose micro- source that generating capacity is big, sagging coefficient is small, close with PCC points distance
Source.
4. the micro-capacitance sensor active synchronization control method according to claim 1 based on distributed AC servo system, feature exist
In the step (4) specifically includes：Consistency protocol ω is used firsti=ω*-miPi+ΔωiWithIt follows micro- source DG-i to control into line frequency using distributed collaboration to i-th to adjust,
In, Δ ωiFor the control variable in i-th of micro- source, kwFor postiive gain coefficient, aijIndicate connection weight between micro- source i and micro- source j,
aij>0 indicates that micro- source i receives the information of micro- source j；For the micro- source DG-k of leader, by synchronous correction signalIt is added to Δ
ωk, using governing equation ωk=ω*-mkPk+ΔωkWithTo institute
It states the micro- source of leader to adjust into line frequency, b is normal number, and the derivative of final all Δ ω is 0, and the Δ ω in all micro- sources is homogeneous
Deng；
Then distributed collaboration governing equation is usedWith
Adjust each micro- source voltage magnitude, Δ ViVariable in order to control, βiFor synchronous correction signalYield value, bijIndicate micro-
Reactive power adjusts weight, b between source i and micro- source jij>0 indicates that micro- source i receives reactive power information from micro- source j；kQj、kQiPoint
Not Wei micro- source j and micro- source i reactive powers divide equally control coefrficient, kvFor postiive gain coefficient, micro- source DG-k, β are led for describedk>0、
bkj=0, follow micro- source DG-i, β for describedi=0, bij=1；
Isochronous controller detects grid-connected switch ends voltage, that is, bulk power grid voltage vgWith PCC point voltages vc, generated by synchronized algorithm
Synchronous correction signalWithThe correction signal is transferred only to lead micro- source, by the consistency protocol of foundation, from
And formed between micro- source and lead-follow relationship, finally so that vc=vg。
5. a kind of micro-capacitance sensor active synchronization control method based on distributed AC servo system according to claim 1, feature exist
In Grid-connection standards include in the step (5):The PCC points voltage meets | fg-fc|≤0.05HZ, | Vg-Vc|≤3%Vn,After three formula and persistently 200ms, isochronous controller sends out order, and grid-connected switch is closed, wherein fgTable
Show bulk power grid frequency, fcIndicate PCC dot frequencies, VgIndicate bulk power grid voltage magnitude, VcIndicate that PCC point voltage magnitudes, Vn indicate mark
Quasi- voltage,Indicate bulk power grid phase angle,Indicate PCC point phase angles.
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| CN107332284B (en) * | 2017-07-14 | 2019-08-16 | 广西大学 | A kind of microgrid inverter droop control method unanimously controlled based on reactive current |
| CN107508313B (en) * | 2017-08-02 | 2019-07-26 | 中南大学 | A kind of micro-capacitance sensor and off-network control method and device |
| US10566793B2 (en) * | 2017-09-29 | 2020-02-18 | Mitsubishi Electric Research Laboratories, Inc. | Systems and methods for distributed synchronization of micro-grids with multiple points of interconnection |
| CN108075488B (en) * | 2017-12-05 | 2021-05-28 | 燕山大学 | Island microgrid layered control method considering communication data disturbance under CPS concept |
| CN111030075B (en) * | 2019-11-26 | 2022-03-22 | 深圳供电局有限公司 | Control method of direct current power supply and distribution system |
| CN110994692B (en) * | 2019-11-27 | 2021-01-05 | 南方电网科学研究院有限责任公司 | Island synchronization grid-connection method based on synchronous phasor measurement device |
| CN111682564B (en) * | 2020-06-06 | 2023-01-24 | 广西电网有限责任公司电力科学研究院 | Active synchronous control method and system for distributed energy storage fast smooth grid connection |
| CN112039118B (en) * | 2020-08-25 | 2021-11-02 | 广东电网有限责任公司广州供电局 | Microgrid grid-connected operation control method and device, computer equipment and storage medium |
| CN112260292B (en) * | 2020-10-26 | 2023-01-31 | 深圳供电局有限公司 | Active frequency control method for micro-grid |
| CN113300408B (en) * | 2021-04-30 | 2023-10-27 | 北京天诚同创电气有限公司 | Synchronous control method and system for micro-grid group |
| CN113741365B (en) * | 2021-09-01 | 2022-07-08 | 南京辉强新能源科技有限公司 | Multi-harmonic interference observer-based micro-grid distributed power supply enclosure control method and device |
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