CN116937624B - Design method and system of oscillation suppressor with network construction photovoltaic damping and voltage coordination - Google Patents
Design method and system of oscillation suppressor with network construction photovoltaic damping and voltage coordination 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
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- 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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
Abstract
The invention discloses a method and a system for designing a network-structured photovoltaic damping and voltage-coordinated oscillation suppressor, wherein the method comprises the following steps: firstly, establishing an electromechanical transient model of a photovoltaic power station, and identifying the electromechanical transient model by a wide area measurement and Prony method to obtain a dynamic equivalent model of an external power system; secondly, clustering system oscillation models, recording models with similar oscillation characteristics, and establishing a model library; then designing a photovoltaic damping-voltage coordination controller by adopting a mixed sensitivity control method at a specific corresponding working point according to the oscillation characteristics of each model in the model library, and constructing a controller library; providing corresponding damping control under various oscillation modes by adopting multi-model self-adaptive control; and finally, judging the effective operation domain of the photovoltaic damping control and converting the effective operation domain into a multicellular model of a parameter space to further correct a model library. The flexible suppression of various low-frequency oscillation modes of the power system under the condition of unknown large disturbance is realized, so that the power system can safely and stably operate.
Description
Technical Field
The invention belongs to the technical field of power system control, and particularly relates to a design method and a system of a grid-built photovoltaic damping and voltage coordination oscillation suppressor.
Background
Currently, most of the technology for suppressing the low-frequency oscillation of the power system adopts a form of installing a stabilizer of the power system. The patent with publication number CN112531736A discloses a design method of a wide-area damping controller for suppressing oscillation among power system areas, which comprises the steps of identifying a state space model, identifying a transfer function of the power system, identifying the principle and design of a model predictive controller, analyzing modes and identifying the shapes of the modes, constructing a self-adaptive wide-area damping controller type analog-digital converter according to a critical interval oscillation mode with insufficient damping, sending a control signal to a generator through the analog-digital converter, and adjusting parameters to increase the damping of a target oscillation mode. The patent with the publication number of CN110707684A discloses a control method and a system of an adaptive wide area damping controller based on an immune mechanism, wherein a power grid system model in a typical operation mode is subjected to linearization treatment to determine a control loop, an objective function is determined according to a preset fault set, an artificial immune wide area adaptive control link optimization model is established, parameters of an original controller are adjusted on line according to response of system output, and dynamic stability of the system under unknown faults and disturbance is enhanced. The patent with the publication number of CN115483690A discloses an elastic wide area damping control method and system based on multi-controller switching, when the system is detected to be attacked by faults and the attack duration exceeds the duration threshold value of the fault, the wide area damping controller currently accessed by the power grid closed loop system is cut off, and one of the pre-configured alternative wide area damping controllers with the optimal network state is selected to be accessed into the power grid closed loop system so as to continue oscillation suppression and enhance the interval oscillation suppression capability of the system under different faults.
The new energy power generation technologies such as photovoltaic and the like adopt a large number of power electronic devices, and the method has a more flexible control mode and a faster response speed than a power system stabilizer in the aspect of damping interval oscillation. The patent with publication number CN106532744B discloses a method for regulating active output of a photovoltaic system to inhibit low-frequency oscillation of a power system comprising a large photovoltaic power station by utilizing an active disturbance rejection additional damping controller, wherein the active disturbance rejection control and MPPT control are combined, an active disturbance rejection control strategy of the photovoltaic power station is designed, a set active disturbance rejection controller is designed by adopting a separability principle, the angular speed of a synchronous generator is used as input of the active disturbance rejection controller, and an output signal of the controller is added to a fixed power control outer ring after amplitude limiting, so that the effect of inhibiting the low-frequency oscillation of the power system is achieved.
The effective operation interval of a single controller is always limited, and at certain working points, the controller may not fully exert the damping function of the controller, and even negative damping may be introduced, which is not beneficial to system stability. However, the existing researches are only based on specific working points to design controllers, and when the interval oscillation is caused by large disturbance such as the access or the exit of a photovoltaic power station, the change of tide or the line fault, the effectiveness of the controllers is difficult to ensure.
Disclosure of Invention
The invention provides a design method and a system of a grid-structured photovoltaic damping and voltage coordinated oscillation suppressor, which are used for solving the technical problem that a single controller lacks effective interval oscillation suppression capability for disturbances near different working points under the condition of large disturbance.
In a first aspect, the present invention provides a method of designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor comprising:
establishing a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
Adjusting the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and adding the weighted average of the output of each oscillation suppressor as a final damping control signal in a photovoltaic reactive power control link;
determining an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link, and converting a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and correcting the oscillation suppressor library according to the multicellular body model.
In a second aspect, the present invention provides a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor design system comprising:
the system comprises a building module, a control module and a control module, wherein the building module is configured to build a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
the analysis module is configured to perform characteristic analysis on the mathematical model of the photovoltaic grid-connected system, and a system oscillation model library with typical system oscillation characteristics is constructed according to the system oscillation mode obtained by the characteristic analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
The design module is used for carrying out photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
the output module is configured to adjust the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and the weighted average of the output of each oscillation suppressor is used as a final damping control signal to be added in a photovoltaic reactive power control link;
the conversion module is configured to determine an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link and convert a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and the correction module is configured to correct the oscillation inhibitor library according to the multicellular model.
In a third aspect, there is provided an electronic device, comprising: the system comprises at least one processor and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of designing a networked photovoltaic damping and voltage coordination oscillation suppressor of any of the embodiments of the present invention.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the steps of the method for designing a grid-built photovoltaic damping and voltage-coordinated oscillation suppressor of any of the embodiments of the present invention.
The design method and the system of the network-structured photovoltaic damping and voltage-coordinated oscillation suppressor have the following beneficial effects:
clustering a plurality of oscillation modes and establishing a corresponding model library, wherein fewer models with typical characteristics are used for representing one type of oscillation modes with similar oscillation characteristics, and the photovoltaic damping-voltage coordination controller under a specific working point designed according to the method has an adaptation function and a suppression effect on the oscillation modes with similar characteristics; the multi-model self-adaptive control further combines a plurality of coordination controllers, and the total additional damping signal can effectively ensure the low-frequency oscillation suppression capability of the system under different working points and different oscillation modes under large disturbance by adjusting the weight; in addition, in order to ensure the accuracy of the model library, a multicellular model of a parameter space is constructed and corrected through an effective operation domain of photovoltaic damping control, so that the model library contains as many working points as possible, and positive damping can be provided; the method has remarkable inhibiting effect on the low-frequency oscillation of the system interval, realizes flexible inhibition on various low-frequency oscillation modes of the power system under the condition of unknown large disturbance, and ensures that the power system runs safely and stably.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor according to an embodiment of the present invention;
FIG. 2 is a diagram of a hybrid sensitivity control in accordance with one embodiment of the present inventionA formalized representation of the mixed sensitivity;
FIG. 3 is a schematic diagram of a grid-structured photovoltaic grid-connected power generation system based on multi-model adaptive damping control according to an embodiment of the present invention;
FIG. 4 is a block diagram of a system for designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor according to one embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a method of designing a grid-tied photovoltaic damping and voltage-tuned oscillation suppressor of the present application is shown.
As shown in fig. 1, the design method of the oscillation suppressor with the mesh photovoltaic damping and voltage coordination specifically comprises the following steps:
step S101, a mathematical model of the photovoltaic grid-connected system, which comprises an electromechanical transient model of the photovoltaic power station and a dynamic equivalent model of an external power system, is established.
According to step S101, a grid-connected point (a high-voltage side node of a booster station) is used as a demarcation point of the photovoltaic power station and the external power system. And comprehensively considering the output characteristics of the power generation unit of the photovoltaic power station, the AC/DC collection line, the networking scheme (centralized, serial and distributed) of the inverter and other factors, and adopting network construction control for inverter control to establish an electromechanical transient model of the photovoltaic power station.
Constructing a differential algebraic equation of the photovoltaic grid-connected system, wherein the expression of the differential algebraic equation is as follows:
，
，
in the method, in the process of the invention,for outputting the vector +.>Is a state vector +.>Input vector for system>Is the differential of the state vector and,is the algebraic expression of the state vector and the system input vector contained in the system state equation>The system output equation comprises a algebraic expression of a state vector and a system input vector;
And carrying out linearization processing on the differential algebra equation, and constructing a transfer function after linearization processing, wherein the expression of linearization processing is as follows:
，
，
in the method, in the process of the invention,for the increment of the system state vector differentiation, +.>Is the increment of the state vector, +.>For the increment of the system input vector, +.>For the increment of the system output vector, +.>To characterize the coefficient matrix of the variation relationship between the input vector increment and the system state vector differential increment +.>To characterize the coefficient matrix of the change relation between the state vector increment and the system state vector differential increment +.>To characterize the coefficient matrix of the change relation between the state vector increment and the differential increment of the system output vector, +.>Transpose the symbol;
the transfer function has the expression:
，
in the method, in the process of the invention,is a variable of frequency domain space, +.>Is a unit matrix;
and injecting a Gaussian pseudo-random signal into the control point, sampling an inverse locking signal, and outputting a response, wherein the control point refers to the junction of the photovoltaic grid-connected system and the external power system, and dividing the photovoltaic grid-connected system and the external power system from a specific point, and the grid-connected point is generally used as the control point of the input signal.
From the self-power spectral density of the input signalAnd cross-power spectral density of the output signal +. >Calculating the discrete rate response sequence function of the external power system>Specifically, the input signal is a gaussian pseudo-random signal injected into the control point, and the output signal is an output signal generated by the system under the action of the input signal measured from the observation point.
The expression for calculating the discrete rate response sequence function of the external power system is as follows:
，
response sequence function according to discrete rate of external power systemIdentifying the transfer function by adopting a Prony algorithm to obtain a dynamic equivalent model of the external power system;
and combining the electromechanical transient model of the photovoltaic power station and the dynamic equivalent model of the external power system into a unified mathematical model of the photovoltaic grid-connected system by taking the parameter uncertainty and the measurement signal uncertainty into consideration.
Step S102, performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different.
The feature analysis of the model built in the step S101 is adopted to obtain a large number of system oscillation modes, so that the system oscillation modes The interval oscillation mode of (2) is->The local oscillation mode is +.>Then construct data point for each operating state +.>Wherein, data point->And classifying at least one system oscillation mode by using a K-means++ clustering algorithm by taking the Euclidean distance as a similarity test, classifying and marking the system oscillation modes belonging to the same class of characteristics as the same model, and reducing the number of working conditions to obtain a system oscillation model library containing at least one system oscillation model.
And step S103, designing photovoltaic damping and voltage oscillation suppressors at specific working points corresponding to the oscillation characteristics of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model.
And (3) designing a photovoltaic damping-voltage coordination controller at a specific corresponding working point according to the oscillation characteristics of each model in the system oscillation model library established in the step S102. The photovoltaic power generation system adopts a grid-structured control technology to obtain damping control capability, and a damping-voltage coordination controller is utilized to provide corresponding additional damping for the photovoltaic grid-connected system and inhibit low-frequency oscillation of the power system. Since the oscillation characteristics in different oscillation modes are different, the influence on the system is also different, and therefore, a corresponding controller needs to be designed for each system oscillation model. The oscillation characteristics of different system oscillation models are different, but the system forms are consistent, so that a unified method can be adopted for designing the controller.
FIG. 2 is a graph of hybrid sensitivity controlA formalized representation of the sensitivity of the mixture. Hybrid sensitivity +.>Control the closed loop transfer function from output disturbance to output +.>Shaping, wherein->For generalized subject, ++>Is a generalized controller->For the system transfer function>Is a control signal; />Is a measurement signal; />For external inputs such as disturbance and command signals; />Are error signals; />Then it is related to the control signal, i.e. the voltage reference signal, reasonable +.>The voltage amplitude can be limited to an acceptable range.
Assume thatAnd->Sensitivity from output disturbance to output, respectively +.>And complementary sensitivity->I.e. it is desired to achieve a first objective and a second objective, wherein the expression of the first objective is:
，
in the method, in the process of the invention,as a sensitivity function +.>Weight function as sensitivity function, +.>Is angular frequency;
the expression of the second object is:
，
in the method, in the process of the invention,is mutually engaged withCompensating sensitivity function, < ->A weight function that is a complementary sensitivity function;
the expressions of the first object and the second object are equivalent to:
，
，
in the method, in the process of the invention,taking the frequency as the modulus of the product of the sensitivity function and the weight function of the sensitivity function at infinity,taking the modulus of the product of the complementary sensitivity function and the weight function of the complementary sensitivity function at infinity for the frequency;
Structural overall indexAccording to the structural overall index +.>Performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristics of the at least one system oscillation model, wherein the overall index ∈ ->The expression of (2) is:
，
in the method, in the process of the invention,as a function of sensitivity and sensitivity functionThe weight function product, and the weight function product of the complementary sensitivity function and the complementary sensitivity function.
The overall structural index N is converted into the hybrid sensitivityThe optimal control problem of the system can be solved by utilizing a Matlab robust control tool box, the obtained controller order is often very high, the order reduction processing can be carried out according to the actual situation, the optimal control signal of each step can be obtained, and the damping-voltage control of the system under a specific working point is realized.
The designed controllers can have the adaptation function and the inhibition effect on the oscillation modes of the same kind of characteristics, all the system oscillation models in the system oscillation model library are established to be corresponding controllers, namely a small number of controllers can be matched with most of the oscillation modes, and the oscillation inhibitor library is established.
Step S104, the weight of each oscillation suppressor in the oscillation suppressor library is adjusted according to the current system state, and the weighted average of the output of each oscillation suppressor is used as a final damping control signal to be added in a photovoltaic reactive power control link.
The controller established in step S103 can only work on a certain type of oscillation characteristics, but cannot adapt to low-frequency oscillation suppression of other operating points and other types of oscillation modes under the condition of large disturbance. Therefore, a plurality of coordination controllers are combined, the weight of each controller is regulated by identifying the current system state in real time, and finally, the weighted average output by the controllers is used as a final damping control signal to be added in a photovoltaic reactive power control link. Fig. 3 is a schematic diagram of a grid-structured photovoltaic grid-connected power generation system based on multi-model adaptive damping control, showing the specific control logic of the part. Wherein,for the actual reactive power of the system grid connection, +.>For grid-connected reactive powerReference value of->For grid-connected reference voltage, ">For pulse width modulation input->For grid-connected active power, +.>For the grid-connected active power reference value, +.>Is->Output of->Is the firstkAdditional damping signal for a second iteration,/->Is->Weight of->Is->Output of->Is->Step iteration timeiError between the model output and the actual output of the individual oscillation suppressors,/->For the output of the actual system->Is a virtual inertia coefficient, < >>Is the virtual power angle of the power source,for grid synchronous angular frequency +.>Is a variable of frequency domain space;
Representing iterative calculation of->Step (S)/(S)>Is->The system linear model under different running states is based on +.>Design damping/Voltage coordination controller +.>，/>Is->Output of->Is->Is used for the weight of the (c),as final command signal for photovoltaic damping control, < >>For the output of the actual system->Is thatOutput of->Is->Step iteration time->The error between the model output and the actual output of the oscillation suppressor. And continuously updating posterior probability of each oscillation suppressor matched with the current system state according to the prior probability by adopting a Bayesian method through iterative computation, wherein the expression for calculating the posterior probability is as follows:
，
in the method, in the process of the invention,to adjust the convergence factor of the probability convergence rate +.>Is->Error between the model output and the actual output of the ith oscillation suppressor during step iteration, +.>Is->Step iteration time->Prior probability of the individual oscillation suppressor models, +.>Is->Step iteration time->Posterior probability of the individual oscillation suppressor models, < +.>For the number of oscillation suppressors,is->Step iteration time->Error between the model output and the actual output of the individual oscillation suppressors,/->Is->Step iteration time->The prior probabilities of the individual oscillation suppressor models;
the weights of the individual oscillation suppressors matching the current system state adjustment are calculated from the posterior probability that each oscillation suppressor matches the current system state, where the probability is assumed to follow a gaussian distribution, so the likelihood has an exponential form: . If->Can better match the actual system, then +.>The larger this means that the controller output to which the model corresponds should be given a greater weight. The expression for calculating the weights of the individual oscillation suppressors that match the current system state adjustment is:
，
in the method, in the process of the invention,for the number of oscillation suppressors, +.>For cut-off value, < >>Is->Iterative->Weight coefficients of the individual models;
when (when) </>When (I)>Will be reset to +.>To avoid the situation that the prior probability is equal to 0 at a certain step, resulting in the posterior probability being constant at 0 at a later step. All controller outputs are weighted and summed to obtain the final damping control signal +.>。
And carrying out weighted average on the output of each oscillation suppressor to obtain a final damping control signal, and adding the final damping control signal into a photovoltaic reactive power control link.
Step S105, determining an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link, and converting a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space.
In this step, the determination of the effective operation domain of the photovoltaic damping control in the photovoltaic reactive power control link includes: in order to avoid influencing the normal operation of the photovoltaic grid-connected system and simultaneously keeping the positive damping working state of the additional damping control in all the time, certain limitation needs to be made on the effective operation interval of the system model behind the additional damping controller, and specific constraint conditions are as follows:
，
In the method, in the process of the invention,for the system characteristic root after additional damping control, < ->For the lower regulation limit of the grid-connected voltage reference value, < + >>For the grid-connected voltage reference value, < >>For the upper regulation limit of the grid-connected voltage reference value, < >>For the lower regulation limit of the reactive control signal, +.>For reactive control signalsReference value->Is the upper regulation limit of the reactive control signal.
And step S106, correcting the oscillation suppressor library according to the multicellular model.
In this step, the scalar inequality expression of the effective run domain is converted into a multicellular model of the parameter space, and the model library can be further modified. Set up in system oscillation model libraryThe state matrix of the individual system oscillation model is +.>The subspace formed in the k step of iterative computation is:
，
in the method, in the process of the invention,is->Iterative->Weight coefficient of the individual model, +.>Is->State matrix of individual system oscillation model, +.>For the number of oscillation suppressors, +.>Iteratively calculating +.>A subspace formed by step-opening;
in an effective operation domain multicellular body model, a Monte Carlo method is adopted to generate a model sample set for constructing a system oscillation model library;
adopting principal component analysis to select a target oscillation mode as a characteristic quantity, and adopting a clustering algorithm to construct a system oscillation model library, wherein the target oscillation mode is an oscillation mode which reflects common oscillation characteristics of a certain type of modes in a certain type of oscillation modes obtained after clustering;
If the tensed subspace corresponding to the model library contains insufficient working points capable of providing positive damping, selecting another subspace in the effective operation domain, and repeating the steps of generating and clustering the model sample set until the working points capable of providing positive damping reach a preset threshold value are contained.
In summary, the method of the application clusters a plurality of oscillation modes and establishes a corresponding model library, uses fewer models with typical characteristics to represent one type of oscillation modes with similar oscillation characteristics, and the photovoltaic damping-voltage coordination controller under a specific working point designed according to the method has an adaptation function and a suppression effect on the oscillation modes with similar characteristics; the multi-model self-adaptive control further combines a plurality of coordination controllers, and the total additional damping signal can effectively ensure the low-frequency oscillation suppression capability of the system under different working points and different oscillation modes under large disturbance by adjusting the weight; in addition, in order to ensure the accuracy of the model library, a multicellular model of a parameter space is constructed and corrected through an effective operation domain of photovoltaic damping control, so that the model library contains as many working points as possible, and positive damping can be provided; the method has remarkable inhibiting effect on the low-frequency oscillation of the system interval, realizes flexible inhibition on various low-frequency oscillation modes of the power system under the condition of unknown large disturbance, and ensures that the power system runs safely and stably.
Referring to fig. 4, a block diagram of a grid-tied photovoltaic damping and voltage-tuned oscillation suppressor design system of the present application is shown.
As shown in fig. 4, the surge suppressor design system 200 includes a setup module 210, an analysis module 220, a design module 230, an output module 240, a conversion module 250, and a correction module 260.
Wherein, the establishing module 210 is configured to establish a mathematical model of the photovoltaic grid-connected system including an electromechanical transient model of the photovoltaic power station and a dynamic equivalent model of the external power system; the analysis module 220 is configured to perform feature analysis on the mathematical model of the photovoltaic grid-connected system, and construct a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different; the design module 230 performs photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to an oscillation characteristic of the at least one system oscillation model, and constructs an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relationship with the at least one system oscillation model; an output module 240 configured to adjust the weight of each of the oscillation suppressors in the oscillation suppressor library according to the current system state and append the weighted average of the output of each oscillation suppressor as a final damping control signal in the photovoltaic reactive control link; a conversion module 250 configured to determine an effective operational domain of the photovoltaic damping control in the photovoltaic reactive control link and convert a scalar inequality expression form of the effective operational domain into a multicellular model of a parameter space; a correction module 260 configured to correct the library of oscillation suppressors according to the multicellular model.
It should be understood that the modules depicted in fig. 4 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 4, and are not described here again.
In other embodiments, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the method of designing a grid-built photovoltaic damping and voltage-coordinated oscillation suppressor in any of the method embodiments described above;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
establishing a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
Performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
adjusting the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and adding the weighted average of the output of each oscillation suppressor as a final damping control signal in a photovoltaic reactive power control link;
determining an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link, and converting a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and correcting the oscillation suppressor library according to the multicellular body model.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created from the use of the grid-tied photovoltaic damping and voltage-coordinated oscillation suppressor design system, and the like. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes a memory remotely located with respect to the processor, the remote memory being connectable to the networked photovoltaic damping and voltage coordinated oscillation suppressor design system through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 5, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 5. Memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications of the server and data processing by running non-volatile software programs, instructions and modules stored in the memory 320, i.e., implementing the above-described method embodiment networking photovoltaic damping and voltage-coordinated oscillation suppressor design method. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the networked photovoltaic damping and voltage coordinated oscillation suppressor design system. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
As an embodiment, the electronic device is applied to a network-structured photovoltaic damping and voltage-coordinated oscillation suppressor design system, and is used for a client, and comprises: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
establishing a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
Adjusting the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and adding the weighted average of the output of each oscillation suppressor as a final damping control signal in a photovoltaic reactive power control link;
determining an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link, and converting a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and correcting the oscillation suppressor library according to the multicellular body model.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method of designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor comprising:
establishing a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation characteristics according to the system oscillation mode obtained by the feature analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
Adjusting the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and adding the weighted average of the output of each oscillation suppressor as a final damping control signal in a photovoltaic reactive power control link;
determining an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link, and converting a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and correcting the oscillation suppressor library according to the multicellular body model.
2. The method for designing a grid-built photovoltaic damping and voltage-coordinated oscillation suppressor according to claim 1, wherein the building of a mathematical model of a photovoltaic grid-connected system comprising an electromechanical transient model of a photovoltaic power plant and a dynamic equivalent model of an external power system comprises:
the grid connection point is used as a demarcation point of the photovoltaic power station and an external power system;
comprehensively considering the output characteristics of a power generation unit of the photovoltaic power station, an alternating current-direct current collection line and an inverter networking scheme, adopting networking control on an inverter, and establishing an electromechanical transient model of the photovoltaic power station;
constructing a differential algebraic equation of the photovoltaic grid-connected system, wherein the expression of the differential algebraic equation is as follows:
，
，
In the method, in the process of the invention,for outputting the vector +.>Is a state vector +.>Input vector for system>Is the differential of the state vector and,is the algebraic expression of the state vector and the system input vector contained in the system state equation>The system output equation comprises a algebraic expression of a state vector and a system input vector;
and carrying out linearization processing on the differential algebra equation, and constructing a transfer function after linearization processing, wherein the expression of linearization processing is as follows:
，
，
in the method, in the process of the invention,for the increment of the system state vector differentiation, +.>Is the increment of the state vector, +.>For the increment of the system input vector, +.>For the increment of the system output vector, +.>To characterize the coefficient matrix of the variation relationship between the input vector increment and the system state vector differential increment +.>To characterize the coefficient matrix of the change relation between the state vector increment and the system state vector differential increment +.>To characterize stateCoefficient matrix of the variation relationship between vector increment and system output vector differential increment, +.>Transpose the symbol;
the transfer function has the expression:
，
in the method, in the process of the invention,is a variable of frequency domain space, +.>Is a unit matrix;
injecting a Gaussian pseudo-random signal into the control point, and sampling an inverse locking signal to output a response;
From the self-power spectral density of the input signalAnd cross-power spectral density of the output signal +.>Calculating the discrete rate response sequence function of the external power system>Wherein, the expression for calculating the discrete rate response sequence function of the external power system is as follows:
，
response sequence function according to discrete rate of external power systemIdentifying the transfer function by adopting Prony algorithm to obtainA dynamic equivalence model to an external power system;
and combining the electromechanical transient model of the photovoltaic power station and the dynamic equivalent model of the external power system into a unified mathematical model of the photovoltaic grid-connected system by taking the parameter uncertainty and the measurement signal uncertainty into consideration.
3. The method for designing a grid-built photovoltaic damping and voltage coordination oscillation suppressor according to claim 1, wherein the performing feature analysis on the mathematical model of the photovoltaic grid-connected system, and constructing a system oscillation model library with typical system oscillation features according to the system oscillation mode obtained by the feature analysis comprises:
performing feature analysis on the mathematical model of the photovoltaic grid-connected system to obtain at least one system oscillation mode;
mode of system oscillationThe interval oscillation mode of (2) is->The local oscillation mode is +. >Then construct data point for each operating state +.>Wherein, data point->；
And classifying the at least one system oscillation mode by taking the Euclidean distance as a similarity test and adopting a preset clustering algorithm, classifying and marking the system oscillation modes belonging to the same class of characteristics as the same model, thereby obtaining a system oscillation model library comprising at least one system oscillation model.
4. The method for designing a photovoltaic damped and voltage coordinated oscillation suppressor of claim 1, wherein said designing a photovoltaic damped and voltage oscillation suppressor at a specific operating point corresponding to an oscillation characteristic of said at least one system oscillation model, and constructing an oscillation suppressor library comprises:
assume thatAnd->Sensitivity from output disturbance to output, respectively +.>And complementary sensitivity->I.e. it is desired to achieve a first objective and a second objective, wherein the expression of the first objective is:
，
in the method, in the process of the invention,as a sensitivity function +.>Weight function as sensitivity function, +.>Is angular frequency;
the expression of the second object is:
，
in the method, in the process of the invention,for complementary sensitivity function, +.>A weight function that is a complementary sensitivity function;
the expressions of the first object and the second object are equivalent to:
，
，
In the method, in the process of the invention,taking the frequency as the modulus of the product of the sensitivity function and the weight function of the sensitivity function at infinity,taking the modulus of the product of the complementary sensitivity function and the weight function of the complementary sensitivity function at infinity for the frequency;
structural overall indexAccording to the structural overall index +.>Performing photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristics of the at least one system oscillation model, wherein the overall index ∈ ->The expression of (2) is:
，
in the method, in the process of the invention,a vector formed by the weight function product of the sensitivity function and the weight function product of the complementary sensitivity function and the complementary sensitivity function.
5. A method of designing a grid-tied photovoltaic damped and voltage coordinated surge suppressor according to claim 1, wherein said adjusting the weight of each surge suppressor in said surge suppressor library according to the current system state and adding the weighted average of each surge suppressor output as a final damping control signal to a photovoltaic reactive control link comprises:
and continuously updating the posterior probability of each oscillation suppressor matched with the current system state according to the prior probability, wherein the expression for calculating the posterior probability is as follows:
，
In the method, in the process of the invention,to adjust the convergence factor of the probability convergence rate +.>Is->Error between the model output and the actual output of the ith oscillation suppressor during step iteration, +.>Is->Step iteration time->Prior probability of the individual oscillation suppressor models, +.>Is->Step iteration time->Posterior probability of the individual oscillation suppressor models, < +.>For the number of oscillation suppressors, +.>Is->Step iteration time->Error between the model output and the actual output of the individual oscillation suppressors,/->Is->Step iteration time->The prior probabilities of the individual oscillation suppressor models;
calculating weights of the oscillation suppressors matched with the current system state according to posterior probability of each oscillation suppressor matched with the current system state, wherein the expression for calculating the weights of the oscillation suppressors matched with the current system state is as follows:
，
in the method, in the process of the invention,for the number of oscillation suppressors, +.>For cut-off value, < >>Is->Iterative->Weight coefficients of the individual models;
and carrying out weighted average on the output of each oscillation suppressor to obtain a final damping control signal, and adding the final damping control signal into a photovoltaic reactive power control link.
6. The method of designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor of claim 1, wherein said effective operating domain is expressed as:
，
In the method, in the process of the invention,for the system characteristic root after additional damping control, < ->For the lower regulation limit of the grid-connected voltage reference value,for the grid-connected voltage reference value, < >>For the upper regulation limit of the grid-connected voltage reference value, < >>For the lower regulation limit of the reactive control signal, +.>For reactive control signal reference value,/->Is the upper regulation limit of the reactive control signal.
7. A method of designing a grid-tied photovoltaic damped and voltage coordinated oscillation suppressor according to claim 1, wherein said modifying said library of oscillation suppressors according to said multicellular model comprises:
set up in system oscillation model libraryThe state matrix of the individual system oscillation model is +.>The subspace formed in the k step of iterative computation is:
，
in the method, in the process of the invention,is->Iterative->Weight coefficient of the individual model, +.>Is->State matrix of individual system oscillation model, +.>For the number of oscillation suppressors, +.>Iteratively calculating +.>A subspace formed by step-opening;
in an effective operation domain multicellular body model, a Monte Carlo method is adopted to generate a model sample set for constructing a system oscillation model library;
adopting principal component analysis to select a target oscillation mode as a characteristic quantity, and adopting a clustering algorithm to construct a system oscillation model library, wherein the target oscillation mode is an oscillation mode which reflects common oscillation characteristics of a certain type of modes in a certain type of oscillation modes obtained after clustering;
If the tensed subspace corresponding to the model library contains insufficient working points capable of providing positive damping, selecting another subspace in the effective operation domain, and repeating the steps of generating and clustering the model sample set until the working points capable of providing positive damping reach a preset threshold value are contained.
8. A grid-tied photovoltaic damped and voltage coordinated oscillation suppressor design system comprising:
the system comprises a building module, a control module and a control module, wherein the building module is configured to build a mathematical model of a photovoltaic grid-connected system, wherein the mathematical model comprises an electromechanical transient model of a photovoltaic power station and a dynamic equivalent model of an external power system;
the analysis module is configured to perform characteristic analysis on the mathematical model of the photovoltaic grid-connected system, and a system oscillation model library with typical system oscillation characteristics is constructed according to the system oscillation mode obtained by the characteristic analysis, wherein the system oscillation model library comprises at least one system oscillation model, and the oscillation characteristics of the at least one system oscillation model are different;
the design module is used for carrying out photovoltaic damping and voltage oscillation suppressor design at a specific working point corresponding to the oscillation characteristic of the at least one system oscillation model, and constructing an oscillation suppressor library, wherein each oscillation suppressor in the oscillation suppressor library has an association relation with the at least one system oscillation model;
The output module is configured to adjust the weight of each oscillation suppressor in the oscillation suppressor library according to the current system state, and the weighted average of the output of each oscillation suppressor is used as a final damping control signal to be added in a photovoltaic reactive power control link;
the conversion module is configured to determine an effective operation domain of photovoltaic damping control in the photovoltaic reactive power control link and convert a scalar inequality expression form of the effective operation domain into a multicellular model of a parameter space;
and the correction module is configured to correct the oscillation inhibitor library according to the multicellular model.
9. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any of claims 1 to 7.
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