CN108336769B - Method and system for inhibiting active power output error of distributed power supply under communication interference - Google Patents
Method and system for inhibiting active power output error of distributed power supply under communication interference Download PDFInfo
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The invention discloses a method and a system for inhibiting active power output errors of a distributed power supply under communication interference. According to the method and the system, the state observer is introduced into the distributed control layer of the distributed control system of the distributed power supplies, the error suppression distributed control system is established, and the active output error of the distributed power supplies can be suppressed under the condition that communication interference exists by adopting the error suppression distributed control system, so that the active output of each distributed power supply can be distributed according to a set proportion, and the output fairness principle is met.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution of a power grid, in particular to a method and a system for inhibiting active power output errors of a distributed power supply under communication interference.
Background
In an islanding-operated microgrid, a Distributed communication strategy based on a containment consistency algorithm is often adopted to realize the cooperative operation of a plurality of Distributed Generators (DG) so as to meet the target of voltage and frequency support and output distribution of the islanding microgrid according to a set proportion. However, due to the limitation of communication construction, external malicious attacks, and the like, the distributed communication network is susceptible to communication interference. When a communication line suffers from communication interference, a distributed control strategy based on containment consistency is adopted, active power distribution can deviate from a set value, and the problem of unfair power distribution is caused. However, in the prior art, communication interference is not considered in the distributed communication network, so that an active power output error estimation of the distributed power supply adopting a distributed control strategy based on containment consistency cannot be obtained, and the active power output error cannot be suppressed.
Disclosure of Invention
The invention aims to provide a method and a system for inhibiting an active power output error of a distributed power supply under the influence of communication interference, which can inhibit the active power output error of the distributed power supply under the influence of the communication interference, realize the distribution of the active power output according to a set proportion and ensure the fairness of the output.
In order to achieve the purpose, the invention provides the following scheme:
a method for suppressing active power output error of a distributed power supply under communication interference comprises the following steps:
acquiring a distributed control system of a distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer;
introducing a state observer into the distributed control layer, and establishing an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller;
and adopting the error suppression distributed control system to suppress the active output error of the distributed power supply.
Optionally, a state observer is introduced into the distributed control layer to establish an error-suppression distributed control system, which specifically includes:
according to formula Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi injEstablishing the rapid active-angular frequency droop control layer; wherein Dp,iRepresents the droop coefficient, omega, of the ith distributed power supplyiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Represents the set active power, delta P, of the ith distributed power supplyi *An increment, P, representing the set active power of the ith distributed power supplyi injAnd the power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply.
Optionally, a state observer is introduced into the distributed control layer to establish an error-suppression distributed control system, which specifically includes:
according to the formulaEstablishing the state observer; in the formulaRepresents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a);where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holddown gain of the ith distributed power supply;Ps *is the reference active power of the main distributed power supply,for the actual injection of the power into the microgrid for the main distributed power supply, i.e. mainActive power output of the distributed power supply; dp,sIs the droop coefficient of the main distributed power supply;whereinyiIs the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system.
Optionally, a state observer is introduced into the distributed control layer to establish an error-suppression distributed control system, which specifically includes:
according to the formulaEstablishing the containment consistency controller; whereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error mitigation distributed control system.
The invention also discloses a system for suppressing the active power output error of the distributed power supply under the communication interference, which comprises the following components:
the distributed control system acquisition module is used for acquiring a distributed control system of the distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer;
the error suppression distributed control system establishing module is used for introducing a state observer into the distributed control layer and establishing an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller;
and the active power output error suppression module is used for suppressing the active power output error of the distributed power supply by adopting the error suppression distributed control system.
Optionally, the error-suppression distributed control system establishing module specifically includes:
a fast active-angular frequency droop control layer establishing unit for establishing a droop control layer according to a formula Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi injEstablishing the rapid active-angular frequency droop control layer; wherein Dp,iRepresents the droop coefficient, omega, of the ith distributed power supplyiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Represents the set active power, delta P, of the ith distributed power supplyi *An increment, P, representing the set active power of the ith distributed power supplyi injAnd the power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply.
Optionally, the error-suppression distributed control system establishing module specifically includes:
a state observer establishing unit for establishing a state observer based on a formulaEstablishing the state observer; in the formulaRepresents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a);where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holddown gain of the ith distributed power supply;Ps *is the reference active power of the main distributed power supply,the power of the microgrid is actually injected into the main distributed power supply, namely the active power output of the main distributed power supply; dp,sIs the droop coefficient of the main distributed power supply;whereinyiIs the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system.
Optionally, the error-suppression distributed control system establishing module specifically includes:
a containment consistency controller establishing unit for establishing a containment consistency controller based on a formulaEstablishing the containment consistency controller; whereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error mitigation distributed control system.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a method and a system for inhibiting active output errors of distributed power supplies under communication interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a flowchart of a method for suppressing an active power output error of a distributed power supply under communication interference according to the present invention;
FIG. 2 is a schematic diagram of a distributed control system for a distributed power supply according to the present invention;
FIG. 3 is a schematic structural diagram of an error-suppression distributed control system provided by the present invention;
fig. 4 is a schematic structural diagram of an active power output error suppression system of a distributed power supply under communication interference according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for inhibiting an active power output error of a distributed power supply under the influence of communication interference, which can inhibit the active power output error of the distributed power supply under the influence of the communication interference, realize the distribution of the active power output according to a set proportion and ensure the fairness of the output.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Distributed Generators (DG) have a Distributed inherent characteristic, and the problems of high communication cost, easy generation of single point failures and the like are caused by adopting a traditional centralized control strategy, so that the Distributed control strategy is widely researched and applied. The invention provides a method for suppressing an active power output error of a distributed power supply under communication interference, and the method is a method for suppressing an active power distribution error under distributed control under the condition of communication interference. A distributed control strategy refers to the distributed power sources communicating with each other without the need for a central controller. The holdback consistency algorithm is a common, typical distributed control algorithm. Since distributed control requires communication between adjacent DGs, graph theory knowledge is required.
The knowledge of the graph theory is introduced as follows: an undirected graph may be represented as G (V, E), where V ═ V1,v2,...,vnDenotes each vertex in the diagram;representing edges, i.e. communication connections between vertices.
The communication connection relationship between the vertexes can be represented by a laplacian matrix L, which is as follows:
L＝D-A(1)
wherein D is diag (D)1,d2,...dn) Is a degree matrix, diIndicating the number of vertexes communicatively connected to the ith vertex; a ═ aij)n×nIs an adjacency matrix, if vertex i is communicatively connected to vertex j, then aij>0; if vertex i is not communicatively connected to vertex j, then aij0. Since the present invention only considers the case where the weights of the vertices are the same, if vertex i and vertex j are communicatively connected, a isij1. From the above definition, the sum of the elements of each row of the matrix L is equal to 0. In addition, if the communication network satisfies the spanning tree condition, that is, there is a path between any two vertices, the laplacian matrix L is a symmetric positive definite matrix, and its eigenvalue satisfies 0 ═ λ1<λ2≤···≤λn。
The containment consistency algorithm is introduced as follows:
the general expression form of the containment consistency algorithm is:
in the formula, xiIs a state variable of a node i in the system,is xiThe first derivative of (a); similarly, "above all parameters herein means the first derivative of the parameter; x is the number of0Is a reference value; lijIs the element of the ith row and the jth column in the Laplace matrix L; f. ofiIs a restrictionGain when fi>0, indicating that node i is the master node; when f isi0, meaning that node i is a slave node; x is the number ofjA state variable representing node j; n is the number of nodes in the system. When the spanning tree condition is satisfied, the laplacian matrix L is semi-positive, and the state variables converge at this time:
the meaning of the above equation (3) is that each node can track the value of the master node by adopting the containment consistency algorithm.
Fig. 1 is a flowchart of a method for suppressing an active power output error of a distributed power supply under communication interference according to the present invention. Referring to fig. 1, the method for suppressing the active power output error of the distributed power supply under the communication interference provided by the invention specifically includes:
step 101: acquiring a distributed control system of a distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer.
Fig. 2 is a schematic diagram of a distributed control system of a distributed power supply according to the present invention. "DG # j" in fig. 2 denotes a jth distributed power supply. Referring to fig. 2, the distributed control system of the distributed power supply mainly includes two layers: the layer I is the rapid P-omega (active-angular frequency) droop control layer, and the droop adjustment of the active frequency is realized by depending on local information, so that the rapid response can be realized; and the second layer is the distributed control layer, and DGs connected in communication exchange information so as to achieve the global local information. The method adopted by the layer II is a containment consistency algorithm, so that frequency secondary regulation and output distribution control are realized. Therefore, the layered distributed operation architecture can meet the regulation requirement only by less communication, and the requirement of the micro-grid on communication resources can be greatly reduced.
The control targets of the distributed control system of the distributed power supply based on the containment consistency are as follows:
ωi＝ωb (4)
wherein, ω isiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Indicating the set active power, P, of the ith distributed power supplyi injAnd the power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply.
That is, the control target of the error-suppression distributed control system of the invention is to control the actual angular frequency ωiFrom the nominal angular frequency omegabConsistent, individual distributed power supply contribution Pi injWith respective rated capacity Pi *The ratios of (A) to (B) are consistent.
A distributed control model of the distributed control system of the distributed power supply is as follows:
the formula of the active regulating quantity reference value of the distributed control system is as follows:
the active-angular frequency dispersion droop control model of the rapid active-angular frequency droop control layer of the distributed control system is as follows:
Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi inj (8)
in the formula,. DELTA.Pi *An increase amount of the set active power of the ith distributed power supply is shown,the increment of the set active power of the jth distributed power supply is shown; dp,iRepresents the droop coefficient of the ith distributed power supply, Dp,jRepresents the jth station distributionDroop coefficient of the power supply; n is the total number of distributed power supplies; lijIs the element of the ith row and the jth column in the Laplace matrix L; f. ofiIs the holddown gain of the ith distributed power supply; m isrefThe reference value is the active regulating quantity; omegaiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; k is a radical ofPAnd kIIs a parameter of the proportional integral controller; s represents a complex variable; pi *Indicating the set active power, P, of the ith distributed power supplyi injAnd the power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply.
Wherein the ith distributed power supply is adjacent to the jth distributed power supply. Under an ideal communication condition, the distributed control model can achieve the aims of recovering the rated value of the frequency of the micro-grid and distributing the active output according to the capacity. However, in distributed communication, the distributed power supply is often affected by communication interference, which results in that the DG power allocation rules are broken and the power fairness principle is affected. When the distributed control system is interfered by communication, an error exists in the active power distribution of the distributed power supply, and the specific introduction is as follows:
considering communication interference, the distributed control model shown in equation (6) may become:
equation (9) is a communication interference distributed control model of the distributed control system under the influence of communication interference, where ηiIs the communication interference experienced by the ith station distributed power supply,the reference active power increase amount of the ith station distributed power supply under the influence of communication interference is shown,reference representing jth station distributed power supply under influence of communication interferenceAn active power increase;to representTo the reference value of (c).
The communication interference distributed control model considers the communication interference suffered by the distributed power supply in the distributed communication network, so that the communication interference distributed control model can better reflect the actual operation condition of the distributed power supply in the distributed communication network.
To obtain the deviation between the active output with the communication interference considered and the active output in the ideal case without the communication interference considered, the pair is neededAnd miAnd performing difference to obtain an active adjustment quantity deviation expression. Active regulating variable deviation, i.e.And miThe deviation of (d) is expressed as:
combining the distributed control model represented by equation (6), the communication interference distributed control model represented by equation (9), and the active adjustment quantity deviation expression represented by equation (10), a differential equation expression of the active adjustment quantity deviation can be obtained:
the next step is to obtainAnd mrefThe deviation of (2) is substituted into the equation (11).
To obtainAnd mrefThe deviation of (2) is obtained by considering an equation in which the active adjustment amount reference value equation expressed by equation (7) is affected by communication interference. Therefore, considering the influence of communication interference, equation (7) may become:
whereinIndicating a reference value of the system in case of communication interference;representing the actual angular frequency of the ith distributed power supply under the influence of communication interference.
Meanwhile, establishing an active power regulating quantity reference value deviation expression:
combining the active adjusting quantity reference value formula represented by the formula (7) and the active adjusting quantity reference value formula represented by the formula (12) under the influence of communication interference and the active adjusting quantity reference value deviation expression represented by the formula (13), a second expression of the active adjusting quantity reference value deviation can be obtained:
to obtain in formula (14)The active-frequency dispersion droop control model represented by the formula (8) needs to be written in consideration of the model after communication interference and is subjected to difference processing.
Considering communication interference, an active-angular frequency dispersion droop control model under the influence of the communication interference can be obtained according to equation (8):
whereinAnd the active output of the ith distributed power supply under the influence of communication interference is shown.
Combining the differential equation expression of the active regulating quantity deviation represented by the formula (11), the second expression of the active regulating quantity reference value deviation represented by the formula (14) and the active-frequency dispersion droop control model under the influence of the communication interference represented by the formula (15), the differential equation expression of the active regulating quantity reference value deviation can be obtained:
wherein the content of the first and second substances,l is Laplace matrix, F ═ diag (F)1,f2,...,fn)，f＝(f1,f2,...,fn)T，fnIs the pinning gain of node n; eta ═ eta (eta)1,η2,...,ηn)T，ηnIs communication interference suffered by the node n; is the active adjustment deviation of node n; the active regulating quantity deviation of the node n under the influence of communication interference.
An active adjustment quantity deviation calculation model is obtained from the differential equation expression of the active adjustment quantity deviation represented by equation (11) and the differential equation expression of the active adjustment quantity reference value deviation represented by equation (16):
solving a formula (17) according to the knowledge of the nonlinear homogeneous differential equation set, and calculating to obtain an active power regulating quantity deviation calculation formula:
wherein gamma isIs started. When the spanning tree condition is satisfied,is a negative definite matrix, therebyIs also a negative definite matrix, thereforeIs exponentially decaying.
And (3) solving the limit of the active power regulating quantity deviation calculation formula (18) to obtain a distributed power supply deviation value calculation formula:
wherein Indicating deviation value of nth distributed power supply, e.g.And (3) representing the deviation value of the 1 st distributed power supply.
According to the distributed power deviation value calculation formula shown in formula (19), it can be determined that the error expression of the active power output when the system has communication interference is as follows:
wherein Δ Pi injThe active output error of the ith distributed power supply is represented;indicating deviation value of i-th distributed power supply, e.g.And (3) representing the deviation value of the 1 st distributed power supply. The active power output error value Δ P of the distributed power supply may be calculated according to the active power output error expression shown in equation (20)i inj。
Equation (20) shows that when the distributed control system is subjected to communication interference, an error exists in the active power distribution of the distributed power supply, and therefore a new control strategy needs to be invented to suppress the active power error caused by the communication interference.
The invention discloses a method for suppressing the active output error of a distributed power supply under communication interference. The method specifically comprises the following steps:
step 102: introducing a state observer into the distributed control layer, and establishing an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller.
Fig. 3 is a schematic structural diagram of an error-suppression distributed control system provided by the present invention. See the figure3, in order to realize the control target of active power distribution according to capacity, the error suppression distributed control system provided by the invention adopts a layered distributed control architecture, which comprises an I layer: a dispersion control layer, i.e. the fast active-angular frequency droop control layer; layer II, distributed control layer. In the I-th layer of the dispersion control layer, a rapid P-omega (active-angular frequency) droop control strategy is adopted, and the expression is (8); the second layer distributed control layer comprises a state observer part and a containment consistency control part, wherein the state observer part estimates miAnd communication interference etaiAnd provides it to the pinning consistency control section.
The expression of the control equation of the layer II (the distributed control strategy adopting the containment consistency of the state observer) of the invention comprises:
the control equation for the holdback consistency controller:
control equation of the state observer:
the formula (21) is a pinning consistency part, and the formula (22) is an expression of a state observer. WhereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error mitigation distributed control system.
In the formula, yiIs the output of the error-suppressing distributed control system, the control law uiThe expression of (a) is:
where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holdover gain of the ith distributed power supply.
Deviation feedback function psi designed by the inventioniThe expression of (a) is:
wherein the content of the first and second substances,yiis the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system.
In the formula (I), the compound is shown in the specification,represents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a).Andare obtained by a state observer. u. ofiIs the control law, psi, designed by the present inventioniAnd is also the bias feedback function designed by the present invention. In the above formula aijIs the element adjacent to the ith row and the jth column in matrix a.Representing the deviation of the actual system output from the estimated output. Dp,sIs the droop coefficient of the main distributed power supply; delta Ps *Is Δ Pi *Is calculated from the reference active and the output active of the main DG. Ps *Reference active power, P, for the main distributed power supplys injAnd the power of the microgrid is actually injected into the main distributed power supply, namely the active power output of the main distributed power supply. Delta Pi *Indicates the increment of the setting work of the i-th station DG, so Δ P is set heres *The DG sets a reference value for the active increase amount, which is known only to the master DG and not to the slave DG.
Step 103: and adopting the error suppression distributed control system to suppress the active output error of the distributed power supply.
According to the error suppression distributed control system provided by the invention, the suppression of the active error under the influence of communication interference can be realized by introducing the state observer. And then, theoretically analyzing the effectiveness of the method for suppressing the active power output error of the distributed power supply under the communication interference.
Defining:
in the formula, ex,iIs miDifference of the estimated value and the actual value of (e)η,iRepresenting the deviation, epsilon, of the estimated value of the communication interference from the true valuei(t) represents miDeviation from its reference value.
By substituting the formulae (26), (27) and (28) into the formulae (21) and (22)
Wherein ε ═ ε1,ε2…εn)T,ex＝(ex,1,ex,2,…ex,n)T,eη＝(eη,1,eη,2,…eη,n)T.
The equations of equations (29) - (31) are written in matrix form:
whereinINAn N-dimensional identity matrix is represented.
When the communication network satisfies the spanning tree condition,for a symmetric negative definite matrix, the eigenvalues are all negative, so U is a Hurwitz (Helverz) matrix, according to the nature of the system of differential equations, so that the following equation (33) holds:
formula (33) illustratesI.e. miAll of them can converge to the set reference value, so there are:
equation (34) illustrates that the increase in the set work is distributed in the set ratio, so the targets shown in equations (4) and (5) can be achieved. That is, the error-suppression distributed control system according to the present invention can control the actual angular frequency ωiFrom the nominal angular frequency omegabConsistent, individual distributed power supply contribution Pi injWith respective rated capacity Pi *The ratios of (A) to (B) are consistent. Therefore, the method provided by the invention can realize the inhibition of active errors in the presence of communication interference, so that the active output can be distributed according to a set proportion, and the output fairness principle is met.
The invention also discloses a system for suppressing the active power output error of the distributed power supply under the communication interference. Fig. 4 is a schematic structural diagram of an active power output error suppression system of a distributed power supply under communication interference according to the present invention. The system comprises:
a distributed control system acquisition module 401, configured to acquire a distributed control system of a distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer;
an error suppression distributed control system establishing module 402, configured to introduce a state observer in the distributed control layer to establish an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller;
and an active power output error suppression module 403, configured to suppress the active power output error of the distributed power supply by using the error suppression distributed control system.
The error-suppression distributed control system establishing module 402 specifically includes:
a fast active-angular frequency droop control layer establishing unit for establishing a droop control layer according to a formula Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi injEstablishing the rapid active-angular frequency droop control layer; wherein Dp,iRepresents the droop coefficient, omega, of the ith distributed power supplyiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Represents the set active power, delta P, of the ith distributed power supplyi *An increment, P, representing the set active power of the ith distributed power supplyi injAnd the power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply.
A state observer establishing unit for establishing a state observer based on a formulaEstablishing the state observer; in the formulaRepresents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a);where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holddown gain of the ith distributed power supply;Ps *is the reference active power of the main distributed power supply,the power of the microgrid is actually injected into the main distributed power supply, namely the active power output of the main distributed power supply; dp,sIs the droop coefficient of the main distributed power supply;whereinyiIs the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system.
A containment consistency controller establishing unit for establishing a containment consistency controller based on a formulaEstablishing the containment consistency controller; whereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error mitigation distributed control system.
The influence of communication interference cannot be inhibited by adopting the traditional distributed control method based on containment consistency, and the active power output distribution has errors. Aiming at the problem, the invention provides a method and a system for suppressing the active output error of a distributed power supply under the condition of communication interference. Therefore, the method and the system provided by the invention have the advantages that the problem that the active output has deviation when the traditional control strategy deals with the communication interference is solved, and when the communication interference exists, the method and the system provided by the invention can inhibit the communication interference, so that the active output can be distributed according to a set proportion, and the output fairness principle is met.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (2)
1. A method for suppressing an active power output error of a distributed power supply under communication interference is characterized by comprising the following steps:
acquiring a distributed control system of a distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer;
introducing a state observer into the distributed control layer, and establishing an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller; introducing a state observer into the distributed control layer to establish an error suppression distributed control system, and specifically comprising:
according to formula Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi injEstablishing the rapid active-angular frequency droop control layer; wherein Dp,iRepresents the droop coefficient, omega, of the ith distributed power supplyiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Represents the set active power, delta P, of the ith distributed power supplyi *An increment, P, representing the set active power of the ith distributed power supplyi injIndicating the power actually injected into the microgrid by the ith distributed power supply,namely the active output of the ith distributed power supply;
according to the formulaEstablishing the state observer; in the formulaRepresents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a);where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holddown gain of the ith distributed power supply; Ps *is the reference active power of the main distributed power supply,the power of the microgrid is actually injected into the main distributed power supply, namely the active power output of the main distributed power supply; dp,sIs the droop coefficient of the main distributed power supply;whereinyiIs the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system;
according to the formulaEstablishing the containment consistency controller; whereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error-mitigating distributed control system;
and adopting the error suppression distributed control system to suppress the active output error of the distributed power supply.
2. A system for suppressing an active power output error of a distributed power supply under communication interference, the system comprising:
the distributed control system acquisition module is used for acquiring a distributed control system of the distributed power supply; the distributed control system comprises a rapid active-angular frequency droop control layer and a distributed control layer;
the error suppression distributed control system establishing module is used for introducing a state observer into the distributed control layer and establishing an error suppression distributed control system; the error suppression distributed control system comprises the rapid active-angular frequency droop control layer, the state observer and a containment consistency controller; the error suppression distributed control system establishing module specifically comprises:
a fast active-angular frequency droop control layer establishing unit for establishing a droop control layer according to a formula Dp,i(ωi-ωb)＝(Pi *-ΔPi *)-Pi injEstablishing the rapid active-angular frequency droop control layer; wherein Dp,iRepresents the droop coefficient, omega, of the ith distributed power supplyiIs the actual angular frequency, omega, of the ith distributed power supplybIs the rated angular frequency; pi *Represents the set active power, delta P, of the ith distributed power supplyi *An increment, P, representing the set active power of the ith distributed power supplyi injThe power actually injected into the microgrid by the ith distributed power supply is represented, namely the active output of the ith distributed power supply;
a state observer establishing unit for establishing a state observer based on a formulaEstablishing the state observer; in the formulaRepresents miIs determined by the estimated value of (c), is composed ofThe first derivative of (a);representing communication interference etaiIs determined by the estimated value of (c),is composed ofThe first derivative of (a);where n is the total number of distributed power sources, aijIs an element adjacent to the ith row and the jth column in the matrix A;is mjIs determined by the estimated value of (c),whereinShowing the set active power increment of the jth distributed power supply, Dp,jRepresenting the droop coefficient of the jth distributed power supply; f. ofiIs the holddown gain of the ith distributed power supply;Ps *is the reference active power of the main distributed power supply,the power of the microgrid is actually injected into the main distributed power supply, namely the active power output of the main distributed power supply; dp,sIs the droop coefficient of the main distributed power supply;whereinyiIs the output of the error-suppressing distributed control system,representing a deviation of an actual output from an estimated output of the error-mitigating distributed control system;
a containment consistency controller establishing unit for establishing a containment consistency controller based on a formulaEstablishing the containment consistency controller; whereinRepresents miThe first derivative of (a); etaiRepresenting communication interference experienced by the error-mitigating distributed control system;
and the active power output error suppression module is used for suppressing the active power output error of the distributed power supply by adopting the error suppression distributed control system.
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