CN103178550A - Three-phase swarm micro-inverter system with cluster adjuster and control method - Google Patents
Three-phase swarm micro-inverter system with cluster adjuster and control method Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a three-phase swarm micro-inverter system with a cluster adjuster and a control method. A micro grid-connected inverter is sensitively controlled by arranging a constant swarm micro-inverter and a free swarm micro-inverter, and meanwhile, the cost is reduced; the cluster adjuster uses a particle swarm algorithm as a power algorithm, so that the power balance is adjusted and the power consumption is reduced; double-level distribution type control is used, so that the micro-inverters exchange information through a local communication network, the cluster adjuster does not need to control each micro-inverter to switch, and the long-distance communication and the cost consumption can be reduced; and when each-phase input power is varied, the entire working efficiency of the micro-inverter can be ensured by switching a sub swarm of the free swarm micro-inverter. The control method is easy to realize, so that the adverse effect on entire current output, caused by the problems that a photovoltaic cell array can not illuminate in a balanced manner, certain photovoltaic cells are damaged and the like, can be effectively solved.
Description
Technical field
The present invention relates to have the little inverter system of three-phase group and the control method of cluster adjuster.
Background technology
Solar energy is clean pollution-free and inexhaustible, nexhaustible, the energy that is available anywhere, in fossil energy today of shortage gradually, select solar energy as an alternative the energy be one of effective way that solves energy crisis.Photovoltaic generating system is general adopts little inverter as the crossover tool of DC-AC.
In engineering practice, the unsuitable too much serial or parallel connection of photovoltaic cell, so most of photovoltaic system adopts many little inverter parallels, replace a large-scale inverter, and photovoltaic battery array of every little inverter connection can improve photovoltaic battery array uneven illumination, single failure etc. to the adverse effect of overall grid.During three-phase grid, traditional method is every similar number, little inverter that structure is identical of all adopting mutually, realizes relatively easily power-balance, but when each phase external condition not simultaneously, easily cause certain little inverter in mutually too much idle.
In many little grid-connected inverters system, if fixedly mean allocation is in the electrical network three-phase for little inverter, although easily control, the utilance of little inverter is restricted, topological underaction; If little inverter all can freely work in electrical network arbitrarily mutually in, can make control cost too high; Therefore be badly in need of proposing a kind of new solar energy three-phase micro-inverter system and control method thereof, reduce power loss, improve the operating efficiency of little inverter.
Summary of the invention
The present invention proposes to have the little inverter system of three-phase group and the control method of cluster adjuster, its purpose is, overcome above-mentioned the deficiencies in the prior art, by the little inverter of group of stability and free group is set, utilize the cluster adjuster to control, guarantee three-phase power balance, reduce power loss, improve little inverter operating efficiency.
The little inverter system of photovoltaic three-phase group with cluster adjuster, comprise cluster adjuster, little inverter group, communication circuit module and testing circuit module, little inverter group's direct-flow input end all is connected with the testing circuit module with ac output end, the output of testing circuit module is connected with the cluster adjuster, and the cluster adjuster connects by communication module and the little inverter faciation of free group;
Described little inverter group comprises 4 groups of single-phase little inverters, is divided into the little inverter of group of stability and the little inverter of free group; Wherein three groups of single-phase little inverters are that the mutually little inverter group of the mutually little inverter group of A, the mutually little inverter group of B and C consists of the little inverter of group of stability, and another group is the little inverter of free group; In little inverter group, the dc terminal of each single-phase little inverter is connected with a photovoltaic battery array output;
In the little inverter of each group of stability, the quantity of single-phase little inverter is identical, the interchange end that A fixes each single-phase little inverter in the group is connected mutually with electrical network A, the interchange end that B fixes each single-phase little inverter in the group is connected with electrical network B, and the interchange end that C fixes each single-phase little inverter in the group is connected mutually with electrical network C;
In the little inverter of free group the interchange end of each single-phase little inverter is by selecting control switch to be connected with the electrical network any one, and is connected by the telecommunication circuit unit between each single-phase little inverter in the little inverter of free group;
The little inverter of free group forms 1～3 subgroup voluntarily, and subgroup group topology has dynamic; The little inverter of free group is queued up at A, B and C three-phase voluntarily according to the power number that every needs mutually replenish, in every phase subgroup to cluster adjuster power information and little inverter of being read as node, when the power sum of little inverter in formation reaches this phase demand, the little inverter of node stops queuing up and sending cohort to the cluster adjuster and complete information, and the cluster adjuster is confirmed cohort.
Each single-phase little inverter in described little inverter group all adopts the interleaving inverse excitation type structure.
Each single-phase little inverter in described little inverter group also comprises control unit, testing circuit unit and telecommunication circuit unit;
Single-phase little inverter in the little inverter of free group carries out the power line carrier, PLC of based on token mechanism by telecommunication circuit unit separately.
Control method with little inverter system of photovoltaic three-phase group of cluster adjuster, adopt the described little inverter system of photovoltaic three-phase group with cluster adjuster, adopt two-stage distributed control, power output and loss power when adopting calculating that particle cluster algorithm calculates as the power optimization algorithm respectively to balance each other by the cluster adjuster, control the power output of each little inverter in phase subgroup in the little inverter group of free group, regulate three-phase power balance, reduce power loss;
Described two-stage distributed control comprises high-rise control and bottom control, and its control on the middle and senior level refers to select in the little inverter of free group the subgroup three-phase that is connected to the grid respectively by the cluster adjuster according to the power output that respectively fixes the group in the little inverter of group of stability;
Bottom control refers to the communication network that forms between the control algolithm of each single-phase little inverter inside and single-phase little inverter; The control algolithm of single-phase little inverter inside comprises operating efficiency control, also comprises MPPT control of the prior art, sharing control, current loop control and phase-locked loop (PLL) control; The communication network that forms between single-phase little inverter refers to that the communication unit by separately of each single-phase little inverter in the little inverter of free group intercoms mutually, obtain separately power output and operating state, carry out independent assortment according to the power output that respectively fixes the little inverter of group that the cluster adjuster sends, build the little inverter of free group subgroup.
The operating efficiency control procedure of each single-phase little inverter is as follows:
Step 1: the output voltage of the photovoltaic battery array that each single-phase little inverter collection is connected with itself is as input voltage;
Step 2: by calculating each single-phase little inverter input voltage and setting voltage U
minRatio, judge the operating efficiency of each single-phase little inverter;
Step 3: redefine little inverter switching situation.When single-phase little inverter input voltage lower than U
minThe time, if little inverter is in the work that namely has been connected to the grid of input state, quit work voluntarily and being connected of cut-out and electrical network, if little inverter has been in dissengaged positions, keep present situation; When single-phase little inverter input voltage higher than U
minThe time, if little inverter is in dissengaged positions, starts working voluntarily and access electrical network, if little inverter has been in the input state, keep present situation.
Described cluster adjuster adopts particle cluster algorithm as the power optimization algorithm, calculates power output and loss power when respectively balancing each other, wherein, the target function of particle cluster algorithm, namely the adaptive value function is T, reaches minimum value as controlling target with T:
T=k
1P
cost+k
2ΔP
s
Wherein, P
CostBe power loss: P
Cost=(P
inA+ P
inB+ P
inC)-(P
OutA+ P
OutB+ P
OutC), Δ P
sBe the three-phase equilibrium expression formula: Δ P
s=(P
OutA-P
OutB)
2+ (P
OutB-P
OutC)
2+ (P
OutC-P
OutA)
2,
Be the power output summation of the mutually little inverter of A,
Be the power output summation of the mutually little inverter of B,
Be the power output summation of the mutually little inverter of C,
Be the input power summation of the mutually little inverter of A,
Be the input power summation of the mutually little inverter of B,
Be the input power summation of the mutually little inverter of C, k
1, k
2Be respectively P
CostWith Δ P
sCoefficient, 0＜k
1＜k
2＜1;
The particle cluster algorithm model is as follows:
v
i(t)=wv
i(t-1)+c
1r
1(p
i-x
i(t-1))+c
2r
2(p
g-x
i(t-1)) （1）
x
i(t)=v
i(t)+x
i(t-1) （2）
In formula, x
iBe particle position; v
iBe flying speed of partcles; W is inertia weight; c
1, c
2Be acceleration factor; r
1, r
2Be the random number in [0,1] range; p
iPosition for individual optimal particle; p
gPosition for global optimum's particle;
With P
OutA, P
OutB, P
OutCAnd P
inA, P
inB, P
inCThe sextuple space that consists of is as the location finding space of particle, and particle population number is N, and iterations is M;
Random initializtion population particle position and flying speed make w=0.9, c
1=c
2=0.5; Relatively particle current location and this particle live through desired positions p
iAdaptive value, if the adaptive value of particle current location is less than individual desired positions p
iAdaptive value, replace p with current particle position
iMore individual optimum particle position p
iWith the particle position p of global optimum
gAdaptive value, if p
iAdaptive value less than p
gAdaptive value, p
iGive p
gRecomputate particle position and speed according to formula (1) and formula (2), if reach stopping criterion for iteration or iterations, stop iteration, current solution is the optimal solution iteration
Wherein, end condition is:
Described single-phase little inverter is 200W.
Beneficial effect
The invention provides the little inverter system of the three-phase group with cluster adjuster and control method, by the little inverter of group of stability and free group is set, realize the flexible control to little inverter that is incorporated into the power networks, make simultaneously cost; Utilize the cluster adjuster to adopt particle cluster algorithm as power algorithm, the regulating power balance reduces power loss; Adopt two-stage distributed control, pass through the local communication network exchange message between each little inverter, the cluster adjuster does not need each little inverter switching is controlled, long haul communication and cost consumption have been reduced, when each phase input power changes, the little inverter of switching free group subgroup can guarantee little inverter whole work efficiency, and the method is easy to realize, effectively solves the problem adverse effects that output causes to overall current such as the uneven and indivedual damages of photovoltaic battery array illumination.
Description of drawings
Fig. 1 is the little inverter system structural representation of photovoltaic three-phase group of the present invention;
Fig. 2 is the little inverter system free group of photovoltaic three-phase group of the present invention structural representation;
Fig. 3 is that the little inverter system cluster of photovoltaic three-phase group of the present invention adjuster is to the control schematic diagram of A, B, C three-phase;
Fig. 4 is the little inverter local communication of the little inverter system free group of photovoltaic three-phase group of the present invention and dynamic cohort schematic diagram;
Fig. 5 is the little inverter system group of stability of photovoltaic three-phase group of the present invention and free group work schematic diagram;
Fig. 6 is the little inverter system control flow chart of photovoltaic three-phase group of the present invention;
Fig. 7 is the little inverter system interleaving inverse excitation of the photovoltaic three-phase group of the present invention inverter structure figure that declines.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the little inverter system structural representation of photovoltaic three-phase group of the present invention.As shown in the figure, a kind of little inverter system of photovoltaic three-phase group (100) with cluster adjuster, comprise cluster adjuster (103), little inverter group, communication circuit module and testing circuit module, little inverter group's direct-flow input end all is connected with the testing circuit module with ac output end, detection signal input cluster adjuster, the cluster adjuster connects by communication module and the little inverter faciation of free group;
Described little inverter group comprises 4 groups of single-phase little inverters, is used for the direct current that photovoltaic battery array 105 produces is converted to alternating current, is divided into the little inverter of group of stability and the little inverter of free group; Wherein three groups of single-phase little inverters wherein three groups of single-phase little inverters be that the mutually little inverter group of the mutually little inverter group of A, the mutually little inverter group of B and C consists of the little inverter of group of stability, another group is the little inverter of free group; In little inverter group, the dc terminal of each single-phase little inverter is connected with a photovoltaic battery array (105) output;
In each group of stability, the quantity of single-phase little inverter is identical, the interchange end that A fixes each single-phase little inverter in the group is connected mutually with electrical network (101) A, the interchange end that B fixes each single-phase little inverter in the group is connected with electrical network (101) B, and the interchange end that C fixes each single-phase little inverter in the group is connected mutually with electrical network (101) C;
In the little inverter of free group, the interchange end of each single-phase little inverter is connected with the electrical network any one by selector switch, is connected by telecommunication circuit between each single-phase little inverter in the little inverter of free group.
Each single-phase little inverter all adopts the interleaving inverse excitation type structure, and as shown in Figure 7, the interleaving inverse excitation translation circuit carries out dc-dc conversion, and inverter bridge is carried out the DC-AC conversion, alternating current input electrical network.
Cluster adjuster (103) is used for regulating three-phase power balance, reduces power loss.
The little inverter of group of stability (102) is divided into A phase, B and reaches mutually 3 group of stabilitys 102 of C phase and free group 104, little inverter number in group of stability is more, the location distribution freedom and flexibility, decide the installation site in its sole discretion by the user, little inverter number in free group is less, concentrate in its geographical position, and unified plan is in the good place of illumination condition.The group of stability steady job is in A, B, C three-phase, the contained little inverter number of each group of stability equates, number is determined by user's request, can not wait to thousands of from dozens of, and the little inverter in free group can form 1～3 subgroup voluntarily, its exchange end dynamically with electrical network in a certain being connected, fixing, work in which phase by cluster adjuster 103 decision free group subgroups.
For example: if each little inverter rated output power is 200W, user's request is every phase 4kW, and group of stability can be established 20 little inverters of every phase, considers not to be that each little inverter is operated in specified situation, and can separately establish has 30 little inverters in free group.
Fig. 2 is the little inverter system free group of photovoltaic three-phase group of the present invention structural representation.As shown in the figure, every little inverter of a plurality of freedom that comprises mutually, little inverter number that the every phase free group of different time subgroup is contained may be different, and their output is in parallel with group of stability, and electrical network (101) is finally inputted in its output.
Form local communication network between the adjacent little inverter of several free groups, according to self power output, three-phase Difference of Output Power and power loss variations situation, in A phase free group subgroup (1041), freely little inverter 1, free little inverter 2 form one with freely little inverter 3 and can make up the mutually under powered subgroup of A, subgroup by the cluster adjuster is distributed, and they work in the A phase.If A needs to compensate 800W power mutually, the little inverter 1 of freedom in A phase free group subgroup (1041), free little inverter 2 and the total output of freely little inverter 3 only have 600W, be not enough to compensate A phase power, and freely little inverter n power output is 200W, the installation site is near above three little inverters, little inverter n also can form the subgroup with them, and co-operation is in the A phase.If A does not need freely little inverter n mutually, and B needs 200W power back-off mutually, it will work in the B phase after will forming B phase free group subgroup (1042) with other little inverters.
Each free little inverter all can work in the A phase, B phase or C phase, and actual often the free group subgroup all may be arranged in work in mutually, may be a few do not have mutually the free group subgroup in work yet, and be not each freely little inverter work, this depends on the whether factor such as balance of the size of input power and power.
no matter be free group or group of stability, each little inverter also should comprise control unit (1046), testing circuit unit (1045) and telecommunication circuit unit (1044), control unit (1046) is not the cluster adjuster, but each single-phase little inverter island effect, the control centre of sharing control etc., this control unit is controlled each little inverter operating efficiency, and the control circuit unit reception of the little inverter of free group is from the control command of cluster adjuster, by the telecommunication circuit unit adjacent little inverter input power of collection and power output breath, control the local communication between little inverter.
Fig. 3 is that the little inverter system cluster of photovoltaic three-phase group of the present invention adjuster is to the control schematic diagram of A, B and C three-phase.As shown in the figure, the mutually little inverter group of A (301), the mutually little inverter group of B (302), the mutually little inverter group of C (303) are the set that respectively fixes group and free group subgroup.Cluster adjuster (103) gathers each phase input voltage, output voltage, input current and output current by communication module, calculate three-phase input power and power output, and judge on this basis power-balance situation and the power loss situation of present three-phase, while is sent the switching instruction to the free group in electrical network, replenished the deficiency of group of stability by free group, final balance three phase power reduces power loss.
The little inverter system of photovoltaic three-phase group adopts two-stage distributed control strategy that little inverter is controlled, bottom control is that the communication between the little inverter of control unit free group of each little inverter inside realizes, high-rise control is that the cluster adjuster is to the control network of little inverter.Communication network between the little inverter of free group contains a lot of global nodes, each little inverter of free group all can be used as node, but only have in the group of each spontaneous formation one at first to cluster adjuster power information and little inverter of being read as node, the cluster adjuster is controlled little inverter subgroup by these global nodes.So the cluster adjuster does not need to obtain the communication information between little inverter, do not need each little inverter is controlled yet, the information such as the little inverter operating state of group, power output that only need to gain freedom from node, to automatically the switching control of being incorporated into the power networks of the little inverter group of cohort get final product.
The cluster adjuster is particle cluster algorithm to the control of the little inverter system of three-phase group with regulating what adopt.
Whole system also comprises testing circuit module (1031) and communication circuit module (1032), the testing circuit module is used for providing each phase input voltage, output voltage, input current and output current to the adjuster of trooping, and communication circuit module sends control command for the adjuster of trooping to the outside.As shown in the figure, testing circuit and telecommunication circuit are connected between little inverter and cluster adjuster, belong to common circuit.
Fig. 4 is the little inverter local communication of the little inverter system free group of photovoltaic three-phase group of the present invention and dynamic cohort schematic diagram.As shown in the figure, take 4 little inverters as example, for the control information of guaranteeing the cluster adjuster all arrives each little inverter, the local communication between little inverter is very important, adopts the power line carrier, PLC of based on token mechanism between the little inverter of free group.The little inverter of free group is by providing every performance number that need compensate mutually of power output, operation information and the output of cluster adjuster separately, automatically carry out cohort, because the variation of little inverter free group topology along with above-mentioned condition changes, so the communication network between little inverter is different and change in time, the cohort topology between little inverter is dynamic; Wherein whether operation information refers to the little inverter work of individual event.As little inverter 4 in Fig. 4 (a) to little inverter 3 transmitted powers and operation information, in Fig. 4 (b) little inverter 4 is to little inverter 2 and little inverter 3 transmitted powers and operation information, little inverter 4 and the mutual transmitted power of little inverter 3 and operation information in Fig. 4 (c); Little inverter 1 and 2 combinations of little inverter in Fig. 4 (a), little inverter 2 and 3 combinations of little inverter in Fig. 4 (b), little inverter 1, little inverter 2 and 3 combinations of little inverter in Fig. 4 (c).
Which in three phase network of each group work by the cluster adjuster according to three-phase power balance situation and power loss situation Comprehensive Control.Communication between little inverter belongs to the bottom control of the distributed control of secondary, and bottom communication is not subjected to high-rise control effect.Little inverter does not need with other each little inverter or the high-rise network of controlling to communicate, and only needs to carry out operation conditions by the little inverter that closes on it and relatively gets final product.
Whether little inverter i can receive the control signal of cluster adjuster or power and the operation information of other little inverters, the current topology that depends on little inverter i group communication network of living in, so all have in the group of each spontaneous formation one at first to cluster adjuster power information and little inverter of being read as global node, directly collect the control signal of group's adjuster.
Fig. 5 is the little inverter system group of stability of photovoltaic three-phase group of the present invention and free group work schematic diagram.As shown in the figure, suppose that A fixes four photovoltaic battery arrays (grey color part) of group in (1021) and causes this phase power output to reduce due to uneven illumination or failure and other reasons, thereby might cause three-phase power imbalance, in free group this moment (104), four little inverters of subgroup A drop into A phase electrical network under the control of cluster adjuster, make up the deficiency that A exports mutually.Simultaneously, B fixes the deficiency that group (1022) and C fix group (1023) and is also made up by the subgroup B in free group (104) and subgroup C.When next control cycle arrived, these little inverters that are respectively used to additional A, B, C three-phase solid grouping may turn to and work in other two-phases, perhaps do not work.
Fig. 6 (a) is the control flow chart of each little inverter operating efficiency of the little inverter system of photovoltaic three-phase group of the present invention.As shown in the figure, the method comprises:
Execution in step a601, the output voltage of the photovoltaic battery array that each single-phase little inverter collection is connected with itself is as input voltage;
Execution in step a602 is by calculating each single-phase little inverter input voltage and setting voltage U
minRatio, judge the operating efficiency of each single-phase little inverter, U
min=20V;
Execution in step a603 redefines little inverter switching situation.When single-phase little inverter input voltage lower than U
minThe time, if little inverter is in the work that namely has been connected to the grid of input state, quit work voluntarily and being connected of cut-out and electrical network, if little inverter has been in dissengaged positions, keep present situation; When single-phase little inverter input voltage higher than U
minThe time, if little inverter is in dissengaged positions, starts working voluntarily and access electrical network, if little inverter has been in the input state, keep present situation.
Fig. 6 (b) controls and the flow chart that is incorporated into the power networks for the little inverter system power adjustments of photovoltaic three-phase group of the present invention.As shown in the figure, the method comprises:
Execution in step b601, little inverter change-over circuit is converted to alternating current with the direct current that photovoltaic battery array produces;
Execution in step b602, cluster adjuster confirm little inverter number of every free group mutually subgroup from the cohort situation with free group according to particle cluster algorithm result of calculation;
Execution in step b603, the cluster adjuster drops into respectively the electrical network three-phase with the subgroup of free group;
Execution in step b604 is with each phase electrical network of input after the alternating current merging of a plurality of little inverter outputs.
In Fig. 6 (b), the cluster adjuster adopts particle cluster algorithm as the power optimization algorithm, and when calculating three-phase equilibrium, the lowest loss power of each phase is realized the target that three-phase power balance and power loss are minimum.
At definite target function T=k
1P
Cost+ k
2Δ P
s, k
1=0.4, k
2Under=0.6 prerequisite, at first crowd quantity N=30 is set, iterations M=60, inertia weight w=0.9, accelerator coefficient c
1=c
2=0.5, then according to the adaptive value function
v
i(t)=wv
i(t-1)+c
1r
1(p
i-x
i(t-1))+c
2r
2(p
g-x
i(t-1))
x
i(t)=v
i(t)+x
i(t-1)
Read particle rapidity v
iWith position x
i, the position p of more individual optimal particle
iPosition p with global optimum's particle
gThe value row iteration of going forward side by side, judge whether to find optimal solution by (getting A=0.05) at last
If export optimal solution, otherwise continue iterative computation until reach maximum iteration time.
Iteration obtains optimum input-output power
After, the cluster adjuster the current input-output power of system with
Compare, obtain difference
Then in conjunction with the power information of the little inverter fed of free group, determine to need to drop into the free group subgroup of every phase, and the little inverter of global node in the subgroup sends instruction, instruction passes to other little inverters by local communication network, remaining little inverter corresponding actions in each group, drop into corresponding A, B, C phase electrical network, coordinate and complete three-phase power balance, control target that power loss is minimum.For example: reduce 600W if A fixes group power output, cause three-phase power imbalance, after the cluster adjuster sends this information to free group, the little inverter that is 200W by 3 power outputs in free group forms a subgroup and feeds back to the cluster adjuster, the cluster adjuster is confirmed and the little inverter of these three free groups is dropped into A phase electrical network, thereby it is not enough mutually to have made up A.
Claims (6)
1. the little inverter system of photovoltaic three-phase group that has the cluster adjuster, it is characterized in that, comprise cluster adjuster, little inverter group, communication circuit module and testing circuit module, little inverter group's direct-flow input end all is connected with the testing circuit module with ac output end, the output of testing circuit module is connected with the cluster adjuster, and the cluster adjuster connects by communication module and the little inverter faciation of free group;
Described little inverter group comprises 4 groups of single-phase little inverters, is divided into the little inverter of group of stability and the little inverter of free group; Wherein three groups of single-phase little inverters are that the mutually little inverter group of the mutually little inverter group of A, the mutually little inverter group of B and C consists of the little inverter of group of stability, and another group is the little inverter of free group; In little inverter group, the dc terminal of each single-phase little inverter is connected with a photovoltaic battery array output;
In the little inverter of each group of stability, the quantity of single-phase little inverter is identical, the interchange end that A fixes each single-phase little inverter in the group is connected mutually with electrical network A, the interchange end that B fixes each single-phase little inverter in the group is connected with electrical network B, and the interchange end that C fixes each single-phase little inverter in the group is connected mutually with electrical network C;
In the little inverter of free group the interchange end of each single-phase little inverter is by selecting control switch to be connected with the electrical network any one, and is connected by the telecommunication circuit unit between each single-phase little inverter in the little inverter of free group;
The little inverter of free group forms 1～3 subgroup voluntarily, and subgroup group topology has dynamic; The little inverter of free group is queued up at A, B and C three-phase voluntarily according to the power number that every needs mutually replenish, in every phase subgroup to cluster adjuster power information and little inverter of being read as node, when the power sum of little inverter in formation reaches this phase demand, the little inverter of node stops queuing up and sending cohort to the cluster adjuster and complete information, and the cluster adjuster is confirmed cohort.
2. the little inverter system of photovoltaic three-phase group with cluster adjuster according to claim 1, is characterized in that, each the single-phase little inverter in described little inverter group all adopts the interleaving inverse excitation type structure.
3. the described little inverter system of photovoltaic three-phase group with cluster adjuster of any one according to claim 1 and 2, it is characterized in that, each the single-phase little inverter in described little inverter group also comprises control unit, testing circuit unit and telecommunication circuit unit;
Single-phase little inverter in the little inverter of free group carries out the power line carrier, PLC of based on token mechanism by telecommunication circuit unit separately.
4. the control method that has the little inverter system of photovoltaic three-phase group of cluster adjuster, it is characterized in that, adopt the described little inverter system of photovoltaic three-phase group with cluster adjuster of claim 1-3, adopt two-stage distributed control, adopt particle cluster algorithm to calculate power output and loss power when respectively balancing each other as the power optimization algorithm by the cluster adjuster, control the power output of each little inverter in phase subgroup in the little inverter group of free group, regulate three-phase power balance;
Described two-stage distributed control comprises high-rise control and bottom control, and its control on the middle and senior level refers to select in the little inverter of free group the subgroup three-phase that is connected to the grid respectively by the cluster adjuster according to the power output that respectively fixes the group in the little inverter of group of stability;
Bottom control refers to the communication network that forms between the control algolithm of each single-phase little inverter inside and single-phase little inverter; The control algolithm of single-phase little inverter inside comprises operating efficiency control; The communication network that forms between single-phase little inverter refers to that the communication unit by separately of each single-phase little inverter in the little inverter of free group intercoms mutually, obtain separately power output and operating state, carry out independent assortment according to the power output that respectively fixes the little inverter of group that the cluster adjuster sends, build the little inverter of free group subgroup.
5. the control method with little inverter system of photovoltaic three-phase group of cluster adjuster according to claim 4, is characterized in that, the operating efficiency control procedure of each single-phase little inverter is as follows:
Step 1: the output voltage of the photovoltaic battery array that each single-phase little inverter collection is connected with itself is as input voltage;
Step 2: by calculating each single-phase little inverter input voltage and setting voltage U
minRatio, judge the operating efficiency of each single-phase little inverter;
Step 3: redefine little inverter switching situation.When single-phase little inverter input voltage lower than U
minThe time, if little inverter is in the work that namely has been connected to the grid of input state, quit work voluntarily and being connected of cut-out and electrical network, if little inverter has been in dissengaged positions, keep present situation; When single-phase little inverter input voltage higher than U
minThe time, if little inverter is in dissengaged positions, starts working voluntarily and access electrical network, if little inverter has been in the input state, keep present situation.
6. the control method with little inverter system of photovoltaic three-phase group of cluster adjuster according to claim 4, it is characterized in that, described cluster adjuster adopts particle cluster algorithm as the power optimization algorithm, calculate power output and loss power when respectively balancing each other, wherein, the target function of particle cluster algorithm, namely the adaptive value function is T, reaches minimum value as controlling target with T:
T=k
1P
cost+k
2ΔP
s
Wherein, P
CostBe power loss: P
Cost=(P
inA+ P
inB+ P
inC)-(P
OutA+ P
OutB+ P
OutC), Δ P
sBe the three-phase equilibrium expression formula: Δ P
s=(P
OutA-P
OutB)
2+ (P
OutB-P
OutC)
2+ (P
OutC-P
OutA)
2,
Be the power output summation of the mutually little inverter of A,
Be the power output summation of the mutually little inverter of B,
Be the power output summation of the mutually little inverter of C,
Be the input power summation of the mutually little inverter of A,
Be the input power summation of the mutually little inverter of B,
Be the input power summation of the mutually little inverter of C, k
1, k
2Be respectively P
CostWith Δ P
sCoefficient, 0＜k
1＜k
2＜1;
The particle cluster algorithm model is as follows:
v
i(t)=wv
i(t-1)+c
1r
1(p
i-x
i(t-1))+c
2r
2(p
g-x
i(t-1)) （1）
x
i(t)=v
i(t)+x
i(t-1) （2）
In formula, x
iBe particle position; v
iBe flying speed of partcles; W is inertia weight; c
1, c
2Be acceleration factor; r
1, r
2Be the random number in [0,1] range; p
iPosition for individual optimal particle; p
gPosition for global optimum's particle;
With P
OutA, P
OutB, P
OutCAnd P
inA, P
inB, P
inCThe sextuple space that consists of is as the location finding space of particle, and particle population number is N, and iterations is M;
Random initializtion population particle position and flying speed make w=0.9, c
1=c
2=0.5; Relatively particle current location and this particle live through desired positions p
iAdaptive value, if the adaptive value of particle current location is less than individual desired positions p
iAdaptive value, replace p with current particle position
iMore individual optimum particle position p
iWith the particle position p of global optimum
gAdaptive value, if p
iAdaptive value less than p
gAdaptive value, p
iGive p
gRecomputate particle position and speed according to formula (1) and formula (2), if reach stopping criterion for iteration or iterations, stop iteration, current solution is the optimal solution iteration
Wherein, end condition is:
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| CN103647467A (en) * | 2013-11-15 | 2014-03-19 | 浙江大学 | Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network |
| WO2016133467A1 (en) * | 2015-02-20 | 2016-08-25 | Amk D.O.O., Inzeniring, Svetovanje, Trgovina | A photovoltaic system for controling single phase photovoltaic sources for optimal self-consumption |
| CN109599891A (en) * | 2018-11-15 | 2019-04-09 | 中国科学院电工研究所 | The control method of photovoltaic power generation and power grid three-phase equilibrium |
| CN109858706A (en) * | 2019-02-21 | 2019-06-07 | 蔡小青 | A kind of project cost data management system and method |
| CN113078241A (en) * | 2021-03-31 | 2021-07-06 | 上海空间电源研究所 | Space solar cell array and hybrid connection method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647467A (en) * | 2013-11-15 | 2014-03-19 | 浙江大学 | Particle swarm algorithm based VSC multi-target optimization direct power control method under imbalanced electrical network |
| CN103647467B (en) * | 2013-11-15 | 2016-07-06 | 浙江大学 | A kind of based on VSC multiple-objection optimization direct Power Control method under the unbalanced power grid of particle cluster algorithm |
| WO2016133467A1 (en) * | 2015-02-20 | 2016-08-25 | Amk D.O.O., Inzeniring, Svetovanje, Trgovina | A photovoltaic system for controling single phase photovoltaic sources for optimal self-consumption |
| CN109599891A (en) * | 2018-11-15 | 2019-04-09 | 中国科学院电工研究所 | The control method of photovoltaic power generation and power grid three-phase equilibrium |
| CN109599891B (en) * | 2018-11-15 | 2022-04-19 | 中国科学院电工研究所 | Control method for three-phase balance of photovoltaic power generation and power grid |
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| CN113078241A (en) * | 2021-03-31 | 2021-07-06 | 上海空间电源研究所 | Space solar cell array and hybrid connection method thereof |
| CN113078241B (en) * | 2021-03-31 | 2022-06-28 | 上海空间电源研究所 | Space solar cell array and series-parallel connection method thereof |
| CN117175693A (en) * | 2023-11-02 | 2023-12-05 | 山东科技大学 | Multi-photovoltaic inverter cooperative particle swarm global maximum power point tracking method and system |
| CN117175693B (en) * | 2023-11-02 | 2024-01-26 | 山东科技大学 | Multi-photovoltaic inverter cooperative particle swarm global maximum power point tracking method and system |
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