CN117748625A - Dual-engine equivalent modeling method and system for wind farm - Google Patents
Dual-engine equivalent modeling method and system for wind farm Download PDFInfo
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Abstract
A wind power plant double-machine equivalent modeling method and system relate to the technical field of modeling of new energy stations of electric power systems, and aim at the problem that in the prior art, a wind power set is not distinguished from a small wind power set in a large wind power set working condition, so that transient response accuracy of the wind power plant in the whole process of high-low voltage ride through is low. According to the wind turbine generator system, different control parameters are adopted by the wind turbine generator system under the strong wind working condition and the weak wind working condition respectively, so that wind motor components of the same model in the wind power plant are divided into a strong wind group and a weak wind group, different voltage crossing period control parameters and voltage recovery control parameters are adopted to be more fit with actual engineering, and the transient response precision of the wind power plant in the whole process of high-low voltage crossing is remarkably improved.
Description
Technical Field
The invention relates to the technical field of modeling of new energy stations of electric power systems, in particular to a double-machine equivalent modeling method and system of a wind power station.
Background
A significant feature of the new power system is that new energy sources dominate the power structure. With the rapid advance of new energy development speed and the gradual expansion of installation scale, the original trend distribution of the power grid, the transmission power of the line and the inertia of the whole system are changed, and the static and dynamic stability of the power system are influenced. Meanwhile, the characteristics of grid connection of the power electronic device and small single-machine capacity are adopted, so that the simulation of the power system model becomes complex and difficult. In order to achieve both simulation precision and calculated amount of the power system and achieve accurate and efficient analysis of dynamic characteristics of the power grid, establishing a new energy station aggregation equivalent model with the same actual operation characteristics becomes one of key problems to be solved in power grid planning and operation control.
Currently, there are a number of solutions for equivalent modeling of wind farms, such as:
1. zhu Qianlong, "wind farm equivalent modeling research suitable for electromechanical transient stability analysis", 2018, university of fertilizer industry, which discloses a wind farm equivalent node model construction method. According to the method, from the system identification modeling point of view, the wind power plant is regarded as a black box, the self-adaption and self-learning capabilities of the BP neural network are utilized to train and test the input and output data of the wind power plant, and finally the equivalent model meets the precision requirement.
2. Gu Ting et al published "wind farm equivalent modeling method based on stand-alone equivalent and selection modality analysis" electric power system protection and control, 2020, 48 (01): 102-111, the article proposes a wind farm equivalence modeling method based on stand-alone equivalence and selection modal analysis. The modeling method firstly carries out aggregation equivalence on a plurality of fans, and then applies a method for selecting modal analysis on the basis of a single-machine equivalent aggregation model, thereby further reducing the model order.
3. Yuan Chao et al, "wind farm equivalent method considering wake effects and connection architecture" study renewable energy, 2023, 41 (06): 794-803, which proposes a wind farm equivalence method based on wake effects and connection architecture. The authors put forward a grouping method for considering wake effects on fan groups according to a wind power plant connection architecture by analyzing errors and reasons of a capacity weighting method, and perform parameter aggregation on the grouping by the capacity weighting method, so that a simple and accurate equivalent model is established.
In summary, the existing wind farm modeling method aims at the problem of insufficient precision of the traditional single machine equivalent method, and the direct precision improvement of the single machine equivalent modeling method or the optimization grouping of the multiple machine equivalent methods are realized through an intelligent optimization algorithm or a complicated physical process derivation, so that the established model lacks versatility and the parameter acquisition process of the equivalent machine is complicated.
Disclosure of Invention
The purpose of the invention is that: aiming at the problem that the prior art does not distinguish a strong wind working condition from a small wind working condition of a wind turbine, and further causes low transient response precision of the wind power plant in the whole process of high-low voltage ride through, the double-machine equivalent modeling method and system for the wind power plant are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a wind farm double-machine equivalent modeling method mainly comprises the following steps:
step one: acquiring a topological structure, electrical equipment parameters and an operation scene of a wind power plant;
step two: establishing a detailed transient model of the wind power plant according to the topological structure, electrical equipment parameters and operation scenes of the wind power plant;
step three: after the detailed transient model of the wind power plant is subjected to equivalence, a double-machine equivalent model of the wind power plant is obtained, and the detailed transient model of the wind power plant is subjected to equivalence by the following specific steps:
the method comprises the steps of enabling the equivalent of the same type of wind turbines in a detailed transient model of a wind farm to be two equivalent wind turbines of the same type, enabling all box transformers and collecting networks matched with the wind turbines of the same type to be equivalent to two equivalent box transformers and two equivalent collecting circuits of the same type;
the method comprises the steps of enabling the equivalent wind turbines of the same model in a detailed transient model of a wind farm to be two equivalent wind turbines of the same model based on the following grouping principle:
p=0.5p.u. is adopted as a grouping division point of the strong wind group and the small wind group, and the strong wind group and the small wind group are respectively equivalent to one equivalent wind turbine generator;
and when the number of the wind turbines contained in the large wind group or the small wind group is 0, eliminating the equivalent wind turbines corresponding to the group.
Further, the electrical device parameters include: basic parameters, box transformer parameters, main transformer parameters and current collecting network parameters of the wind turbine generator;
the operation scene is a specific active output condition of the wind turbine generator.
Further, the equivalent wind turbines in the large wind group are first equivalent machines, and the equivalent wind turbines in the small wind group are second equivalent machines;
the active power of the first equivalent machine is equal to the sum of the active power of all generators of the medium-value wind turbines in the high-wind group, and the capacity of the first equivalent machine is the sum of the capacities of all generators of the equivalent wind turbines in the high-wind group;
the active power of the second equivalent machine is equal to the sum of the active power of all the generators of the equivalent wind turbines in the small wind group, and the capacity of the second equivalent machine is the sum of the capacities of all the generators of the equivalent wind turbines in the small wind group.
Further, the wind power plant double-machine equivalent model comprises equivalent wind power set parameters, equivalent box transformer parameters and equivalent current collecting circuit parameters, wherein the equivalent wind power set parameters comprise basic parameters of an equivalent wind power set and operation parameters of the equivalent wind power set;
the basic parameters of the equivalent wind turbine generator set comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters;
the operation parameters of the equivalent wind turbine generator set comprise:
wherein n is the total number of the current wind motor group, P i I=1, 2, …, n, P for the active power output of the ith wind turbine in the group n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is obtained.
Further, the equivalent box-section parameters include:
wherein R1 is positive sequence resistance of the box transformer of the current wind turbine generator group, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, BM is excitation susceptance of the box transformer, and R1 eq Positive sequence resistor corresponding to equivalent box transformer, X1 eq Positive inductive reactance corresponding to equivalent box transformer, GM eq Excitation conductance corresponding to equivalent box transformer, BM eq The excitation susceptance corresponding to the equivalent box transformer;
the equivalent collector line parameters include:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the ith typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is equal to the voltage of the wind turbine generator system>Voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent current collecting line impedance;
positive sequence resistor R1 corresponding to equivalent box transformer eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
A wind farm dual machine equivalent modeling system comprising: the wind power plant detailed transient model building system comprises a data acquisition module, a wind power plant detailed transient model building module and an equivalence module;
the data acquisition module is used for acquiring the topological structure, the electrical equipment parameters and the operation scene of the wind power plant;
the wind power plant detailed transient model building module is used for building a wind power plant detailed transient model according to the topological structure, the electrical equipment parameters and the operation scene of the wind power plant;
the equivalence module is used for obtaining a double-machine equivalence model of the wind power plant after the detailed transient model of the wind power plant is subjected to equivalence, and the specific steps of the equivalence of the detailed transient model of the wind power plant are as follows:
the method comprises the steps of enabling the equivalent of the same type of wind turbines in a detailed transient model of a wind farm to be two equivalent wind turbines of the same type, enabling all box transformers and collecting networks matched with the wind turbines of the same type to be equivalent to two equivalent box transformers and two equivalent collecting circuits of the same type;
the method comprises the steps of enabling the equivalent wind turbines of the same model in a detailed transient model of a wind farm to be two equivalent wind turbines of the same model based on the following grouping principle:
p=0.5p.u. is adopted as a grouping division point of the strong wind group and the small wind group, and the strong wind group and the small wind group are respectively equivalent to one equivalent wind turbine generator;
and when the number of the wind turbines contained in the large wind group or the small wind group is 0, eliminating the equivalent wind turbines corresponding to the group.
Further, the electrical device parameters include: basic parameters, box transformer parameters, main transformer parameters and current collecting network parameters of the wind turbine generator;
the operation scene is a specific active output condition of the wind turbine generator.
Further, the equivalent wind turbines in the large wind group are first equivalent machines, and the equivalent wind turbines in the small wind group are second equivalent machines;
the active power of the first equivalent machine is equal to the sum of the active power of all generators of the medium-value wind turbines in the high-wind group, and the capacity of the first equivalent machine is the sum of the capacities of all generators of the equivalent wind turbines in the high-wind group;
the active power of the second equivalent machine is equal to the sum of the active power of all the generators of the equivalent wind turbines in the small wind group, and the capacity of the second equivalent machine is the sum of the capacities of all the generators of the equivalent wind turbines in the small wind group.
Further, the wind power plant double-machine equivalent model comprises equivalent wind power set parameters, equivalent box transformer parameters and equivalent current collecting circuit parameters, wherein the equivalent wind power set parameters comprise basic parameters of an equivalent wind power set and operation parameters of the equivalent wind power set;
the basic parameters of the equivalent wind turbine generator set comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters;
the operation parameters of the equivalent wind turbine generator set comprise:
wherein n is the total number of the current wind motor group, P i I=1, 2, …, n, P for the active power output of the ith wind turbine in the group n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is obtained.
Further, the equivalent box-section parameters include:
wherein R1 is positive sequence resistance of the box transformer of the current wind turbine generator group, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, BM is excitation susceptance of the box transformer, and R1 eq Positive sequence resistor corresponding to equivalent box transformer, X1 eq Positive inductive reactance corresponding to equivalent box transformer, GM eq Excitation conductance corresponding to equivalent box transformer, BM eq The excitation susceptance corresponding to the equivalent box transformer;
the equivalent collector line parameters include:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the ith typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is equal to the voltage of the wind turbine generator system>Voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent current collecting line impedance;
positive sequence resistor R1 corresponding to equivalent box transformer eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
The beneficial effects of the invention are as follows:
according to the wind turbine generator system, different control parameters are adopted by the wind turbine generator system under the strong wind working condition and the weak wind working condition respectively, so that wind motor components of the same model in the wind power plant are divided into a strong wind group and a weak wind group, different voltage crossing period control parameters and voltage recovery control parameters are adopted to be more fit with actual engineering, and the transient response precision of the wind power plant in the whole process of high-low voltage crossing is remarkably improved.
Aiming at wind power plant modeling, the application provides a practical double-machine equivalent modeling method based on wind speed (active power output) grouping. The clustering method and the equivalent parameter calculation method adopted by the method are simple, on the basis of easy realization in engineering, the transient response precision of the wind power plant in the whole process of high-low voltage ride through is remarkably improved, so that the simulation accuracy of a power grid is improved, the problem that the operation mode is too conservative due to inaccurate wind power models is avoided, and the safe operation level and wind power acceptance of the power grid are improved. Meanwhile, the equivalent modeling thought provided by the method has strong universality, can be suitable for electromechanical transient modeling and electromagnetic transient modeling, and is not limited by types of wind turbine generators such as double-fed type wind turbine generators and direct-driven wind turbine generators.
Drawings
FIG. 1 is a flow chart of a double-engine equivalent modeling of a wind farm;
FIG. 2 is a detailed model block diagram of a wind farm;
FIG. 3 is a diagram of a dual-engine equivalent model structure of a wind farm.
Detailed Description
It should be noted in particular that, without conflict, the various embodiments disclosed herein may be combined with each other.
The first embodiment is as follows: referring to fig. 1, a specific description is given of the present embodiment, and the method for modeling the equivalent of two wind farms according to the present embodiment includes the following steps:
s1, acquiring a topological structure, electrical equipment parameters and an operation scene of a wind power plant;
s2, establishing a detailed transient model of the wind power plant according to the wind power plant topology, the electrical equipment parameters and the operation scene acquired in the S1;
s3, equating the same model of wind turbines in the detailed model of the wind farm into two equivalent wind turbines of the same model, equating all box transformers and collecting networks matched with the wind turbines of the same model into two equivalent box transformers and two equivalent collecting circuits of the same model respectively, and calculating double equivalent parameters based on the detailed model of the wind farm to obtain parameters of the equivalent wind turbines, the equivalent box transformers and the equivalent collecting circuits;
s4, establishing a wind power plant double-machine equivalent model.
In step S1 of the double-machine equivalent modeling method of the wind power plant, the electrical equipment parameters of the wind power plant comprise basic parameters, box-type parameters, main-type parameters and collector network parameters of the wind power plant; the operation scene of the wind power plant is the specific active output condition of the wind turbine generator.
In step S3 of the wind farm double-machine equivalent modeling method, the wind farm double-machine equivalent process is based on the following grouping principle:
in order to reduce equivalent errors caused by different control parameters of parts of the wind turbine under the working conditions of strong wind and weak wind and the recovery characteristic of power of the wind turbine in the voltage disturbance recovery stage, the method adopts P=0.5p.u as a grouping and dividing point of the wind turbine, and wind motor components of the same model in a wind power plant are divided into a strong wind group and a weak wind group, and are respectively equivalent to an equivalent wind power plant.
In step S3 of the dual-engine equivalent modeling method of the wind farm, parameters of the dual-engine equivalent model of the wind farm include basic parameters of an equivalent wind turbine, operation parameters of the equivalent wind turbine, equivalent box-section parameters and equivalent parameters of a power collection network:
the basic parameters of the equivalent wind turbine directly adopt the basic parameters of the wind turbine with the corresponding model, and specifically comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters. It should be noted that in order to improve modeling accuracy to the greatest extent, refined modeling parameters of the wind turbine generator set with the corresponding model should be adopted as much as possible, rather than general parameters provided by simulation software. Meanwhile, for a fan model with two sets of parameters, namely strong wind and small wind, in the refined modeling parameters, the two sets of parameters are filled into equivalent wind turbines of corresponding groups;
the operation parameters of the equivalent wind turbine generator set are as follows:
wherein n is the total number of the current wind motor group, P i Active output (i=1, 2, …, n) of the ith wind turbine generator in the group, P n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is set;
equivalent box-section parameters:
wherein R1 is positive sequence resistance of the box transformer of the current wind turbine group, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, and BM is excitation susceptance of the box transformer.
Equivalent collector line parameters:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the group i typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is the voltage of the equivalent wind turbine generator,voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent collector line impedance. Further obtain positive sequence resistor R1 corresponding to equivalent current collecting circuit eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
In the grouping process of the double-machine equivalent modeling method of the wind power plant, if the number of wind power sets contained in a certain group is 0 after the wind power sets in the wind power plant are divided into two groups according to grouping division points, the equivalent wind power sets corresponding to the group are automatically eliminated, and at the moment, the whole wind power plant can be represented by only 1 equivalent wind power set.
According to the method, wind speed (active power output) is used as a grouping basis, a wind turbine grouping method and an equivalent parameter calculation are simple, a double-machine equivalent method which is easy to realize in engineering is provided, and at most, the response characteristics of a wind power plant in different voltage crossing processes can be represented by only two equivalent grouping motor groups. The method can improve the simulation accuracy of the power grid, avoid the problem that the running mode is too conservative due to inaccurate wind power models, and improve the safe running level and the wind power acceptance capacity of the power grid.
The electrical equipment parameters of the wind power plant comprise basic parameters, box-type parameters, main-type parameters and collector network parameters of the wind turbine generator; the operation scene of the wind power plant is the specific active output condition of the wind turbine generator. In order to reduce equivalent errors caused by different control parameters of parts of the wind turbine under the working conditions of strong wind and weak wind and the recovery characteristic of power of the wind turbine in the voltage disturbance recovery stage, the method adopts P=0.5p.u as a grouping and dividing point of the wind turbine, and wind motor components of the same model in a wind power plant are divided into a strong wind group and a weak wind group, and are respectively equivalent to an equivalent wind power plant. The parameters of the wind power plant double-machine equivalent model comprise basic parameters of an equivalent wind turbine, operation parameters of the equivalent wind turbine, equivalent box-section parameters and equivalent parameters of a power collection network. The basic parameters of the equivalent wind turbine directly adopt the basic parameters of the wind turbine with the corresponding model, and specifically comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters. It should be noted that in order to improve modeling accuracy to the greatest extent, refined modeling parameters of the wind turbine generator set with the corresponding model should be adopted as much as possible, rather than general parameters provided by simulation software. Meanwhile, for a fan model with two sets of parameters including strong wind and small wind in the refined modeling parameters, the two sets of parameters should be filled into equivalent wind turbines of corresponding groups.
In addition, if the number of the wind turbines contained in a certain group is 0 after the wind turbines in the wind power plant are divided into two groups according to the grouping division points, the equivalent wind turbines corresponding to the group are automatically eliminated, and at the moment, the whole wind power plant can be represented by only 1 equivalent wind turbine.
More specifically, the process is carried out,
the following describes a method for modeling the equivalent of a double machine of a wind farm according to the present embodiment with reference to fig. 1, and the method includes the following steps:
s1, acquiring a topological structure, electrical equipment parameters and an operation scene of a wind power plant;
s2, building a detailed transient model of the wind power plant shown in the figure 2 according to the wind power plant topology, the electrical equipment parameters and the operation scene obtained in the S1;
s3, equating the same model of wind turbines in the detailed model of the wind farm into two equivalent wind turbines of the same model, equating all box transformers and collecting networks matched with the wind turbines of the same model into two equivalent box transformers and two equivalent collecting circuits of the same model respectively, and calculating double equivalent parameters based on the detailed model of the wind farm to obtain parameters of the equivalent wind turbines, the equivalent box transformers and the equivalent collecting circuits;
s4, establishing a double-machine equivalent model of the wind power plant shown in the figure 3.
It should be noted that the detailed model and the equivalent model of the wind farm illustrated in fig. 2 and fig. 3 are only examples, and in the practical application process, a corresponding wind farm model needs to be established according to the practical situation of the wind farm to be modeled.
S1, electric equipment parameters of a wind power plant comprise basic parameters, box-type parameters, main transformer parameters and collector network parameters of a wind turbine generator;
the operation scene of the wind power plant is the specific active output condition of the wind turbine generator.
The wind farm double-machine equivalence process in the step S3 is based on the following grouping principle:
the wind turbine generator has obvious difference in active power, rotation speed and pitch angle under the working condition of strong wind and the working condition of weak wind, and the frequency regulation characteristic and the high-low voltage ride through response characteristic are also obviously different. When the control parameters of the wind turbine are designed, an actual wind turbine manufacturer usually adopts two sets of different parameters in a strong wind working condition and a small wind working condition, so that wind motor components of the same model in a wind power plant are divided into a strong wind group and a small wind group, and different control parameters are adopted to be more fit with an actual project; meanwhile, the difference of the fault recovery stages of the wind turbine generator is obvious under the strong wind working condition and the small wind working condition, the active power of the wind turbine generator is fast when the active power of the wind turbine generator is recovered to a steady state value under the small wind working condition, and the active power of the wind turbine generator is slow when the active power of the wind turbine generator is recovered to the steady state value under the strong wind working condition, so that the wind motor components are divided into two groups according to the grouping method and different fault recovery parameters are adopted, and the equivalent precision can be further improved.
In order to reduce equivalent errors caused by different control parameters of parts of the wind turbine under the working conditions of strong wind and weak wind and the recovery characteristic of power of the wind turbine in the voltage disturbance recovery stage, the method adopts P=0.5p.u as a grouping and dividing point of the wind turbine, and wind motor components of the same model in a wind power plant are divided into a strong wind group and a weak wind group, and are respectively equivalent to an equivalent wind power plant.
Parameters of the wind power plant double-machine equivalent model comprise basic parameters of an equivalent wind turbine, operation parameters of the equivalent wind turbine, equivalent box-section parameters and equivalent parameters of a power collection network:
the basic parameters of the equivalent wind turbine directly adopt the basic parameters of the wind turbine with the corresponding model, and specifically comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters. It should be noted that in order to improve modeling accuracy to the greatest extent, refined modeling parameters of the wind turbine generator set with the corresponding model should be adopted as much as possible, rather than general parameters provided by simulation software. Meanwhile, for a fan model with two sets of parameters, namely strong wind and small wind, in the refined modeling parameters, the two sets of parameters are filled into equivalent wind turbines of corresponding groups;
the operation parameters of the equivalent wind turbine generator set are as follows:
wherein n is the total number of the current wind motor group, P i Active output for the ith wind turbine generator in the group(i＝1,2,…,n)，P n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is set;
equivalent box-section parameters:
wherein R1 is positive sequence resistance of the box transformer of the current wind turbine group, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, and BM is excitation susceptance of the box transformer.
Equivalent collector line parameters:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the group i typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is the voltage of the equivalent wind turbine generator,voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent collector line impedance. Further obtain positive sequence resistor R1 corresponding to equivalent current collecting circuit eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
If the number of the wind turbines contained in a certain group is 0 after the wind turbines in the wind power plant are divided into two groups according to the grouping division points, the equivalent wind turbines corresponding to the group are automatically eliminated, and at the moment, the whole wind power plant can be represented by only 1 equivalent wind turbine.
If the wind power plant contains more than one model of wind turbine generator, the number of equivalent machines of the wind power plant is correspondingly increased, namely, the number of model types is doubled.
The equivalent modeling thought provided by the application has stronger universality, can be suitable for electromechanical transient modeling and electromagnetic transient modeling, such as Simulink, PSCAD, PSASP, PSS/E and other simulation software, and is not limited by doubly-fed type wind turbine generator types, direct-drive type wind turbine generator types and the like.
It should be noted that the detailed description is merely for explaining and describing the technical solution of the present invention, and the scope of protection of the claims should not be limited thereto. All changes which come within the meaning and range of equivalency of the claims and the specification are to be embraced within their scope.
Claims (10)
1. The double-machine equivalent modeling method for the wind farm is characterized by mainly comprising the following steps of:
step one: acquiring a topological structure, electrical equipment parameters and an operation scene of a wind power plant;
step two: establishing a detailed transient model of the wind power plant according to the topological structure, electrical equipment parameters and operation scenes of the wind power plant;
step three: after the detailed transient model of the wind power plant is subjected to equivalence, a double-machine equivalent model of the wind power plant is obtained, and the detailed transient model of the wind power plant is subjected to equivalence by the following specific steps:
the method comprises the steps of enabling the equivalent of the same type of wind turbines in a detailed transient model of a wind farm to be two equivalent wind turbines of the same type, enabling all box transformers and collecting networks matched with the wind turbines of the same type to be equivalent to two equivalent box transformers and two equivalent collecting circuits of the same type;
the method comprises the steps of enabling the equivalent wind turbines of the same model in a detailed transient model of a wind farm to be two equivalent wind turbines of the same model based on the following grouping principle:
p=0.5p.u. is adopted as a grouping division point of the strong wind group and the small wind group, and the strong wind group and the small wind group are respectively equivalent to one equivalent wind turbine generator;
and when the number of the wind turbines contained in the large wind group or the small wind group is 0, eliminating the equivalent wind turbines corresponding to the group.
2. The method for modeling the equivalent of two machines in a wind farm according to claim 1, wherein the method comprises the following steps: the electrical device parameters include: basic parameters, box transformer parameters, main transformer parameters and current collecting network parameters of the wind turbine generator;
the operation scene is a specific active output condition of the wind turbine generator.
3. The method for modeling the equivalent of two machines in a wind farm according to claim 2, wherein the method comprises the following steps: the equivalent wind turbines in the large wind group are first equivalent machines, and the equivalent wind turbines in the small wind group are second equivalent machines;
the active power of the first equivalent machine is equal to the sum of the active power of all generators of the medium-value wind turbines in the high-wind group, and the capacity of the first equivalent machine is the sum of the capacities of all generators of the equivalent wind turbines in the high-wind group;
the active power of the second equivalent machine is equal to the sum of the active power of all the generators of the equivalent wind turbines in the small wind group, and the capacity of the second equivalent machine is the sum of the capacities of all the generators of the equivalent wind turbines in the small wind group.
4. A method for modeling double machine equivalence of a wind farm according to claim 3, wherein: the double-machine equivalent model of the wind power plant comprises equivalent wind turbine generator parameters, equivalent box transformer parameters and equivalent collecting line parameters, wherein the equivalent wind turbine generator parameters comprise basic parameters of an equivalent wind turbine generator and operation parameters of the equivalent wind turbine generator;
the basic parameters of the equivalent wind turbine generator set comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters;
the operation parameters of the equivalent wind turbine generator set comprise:
wherein n is the total number of the current wind motor group, P i I=1, 2, …, n, P for the active power output of the ith wind turbine in the group n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is obtained.
5. The method for modeling the equivalent of two machines in a wind farm according to claim 4, wherein the method comprises the following steps: the equivalent box-section parameters include:
wherein R1 is positive sequence resistance of the box transformer of the current wind turbine generator group, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, BM is excitation susceptance of the box transformer, and R1 eq Positive sequence resistor corresponding to equivalent box transformer, X1 eq Positive inductive reactance corresponding to equivalent box transformer, GM eq Excitation conductance corresponding to equivalent box transformer, BM eq The excitation susceptance corresponding to the equivalent box transformer;
the equivalent collector line parameters include:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the ith typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is equal to the voltage of the wind turbine generator system>Voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent current collecting line impedance;
positive sequence resistor R1 corresponding to equivalent box transformer eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
6. A wind farm double-machine equivalent modeling system is characterized by comprising: the wind power plant detailed transient model building system comprises a data acquisition module, a wind power plant detailed transient model building module and an equivalence module;
the data acquisition module is used for acquiring the topological structure, the electrical equipment parameters and the operation scene of the wind power plant;
the wind power plant detailed transient model building module is used for building a wind power plant detailed transient model according to the topological structure, the electrical equipment parameters and the operation scene of the wind power plant;
the equivalence module is used for obtaining a double-machine equivalence model of the wind power plant after the detailed transient model of the wind power plant is subjected to equivalence, and the specific steps of the equivalence of the detailed transient model of the wind power plant are as follows:
the method comprises the steps of enabling the equivalent of the same type of wind turbines in a detailed transient model of a wind farm to be two equivalent wind turbines of the same type, enabling all box transformers and collecting networks matched with the wind turbines of the same type to be equivalent to two equivalent box transformers and two equivalent collecting circuits of the same type;
the method comprises the steps of enabling the equivalent wind turbines of the same model in a detailed transient model of a wind farm to be two equivalent wind turbines of the same model based on the following grouping principle:
p=0.5p.u. is adopted as a grouping division point of the strong wind group and the small wind group, and the strong wind group and the small wind group are respectively equivalent to one equivalent wind turbine generator;
and when the number of the wind turbines contained in the large wind group or the small wind group is 0, eliminating the equivalent wind turbines corresponding to the group.
7. The dual machine equivalent modeling system for a wind farm of claim 6, wherein: the electrical device parameters include: basic parameters, box transformer parameters, main transformer parameters and current collecting network parameters of the wind turbine generator;
the operation scene is a specific active output condition of the wind turbine generator.
8. The dual machine equivalent modeling system for a wind farm of claim 7, wherein: the equivalent wind turbines in the large wind group are first equivalent machines, and the equivalent wind turbines in the small wind group are second equivalent machines;
the active power of the first equivalent machine is equal to the sum of the active power of all generators of the medium-value wind turbines in the high-wind group, and the capacity of the first equivalent machine is the sum of the capacities of all generators of the equivalent wind turbines in the high-wind group;
the active power of the second equivalent machine is equal to the sum of the active power of all the generators of the equivalent wind turbines in the small wind group, and the capacity of the second equivalent machine is the sum of the capacities of all the generators of the equivalent wind turbines in the small wind group.
9. The dual machine equivalent modeling system for a wind farm of claim 8, wherein: the double-machine equivalent model of the wind power plant comprises equivalent wind turbine generator parameters, equivalent box transformer parameters and equivalent collecting line parameters, wherein the equivalent wind turbine generator parameters comprise basic parameters of an equivalent wind turbine generator and operation parameters of the equivalent wind turbine generator;
the basic parameters of the equivalent wind turbine generator set comprise: generator/converter model parameters, wind turbine and controller parameters, voltage ride-through control parameters, voltage recovery control parameters, and asymmetric fault handling parameters;
the operation parameters of the equivalent wind turbine generator set comprise:
wherein n is the total number of the current wind motor group, P i I=1, 2, …, n, P for the active power output of the ith wind turbine in the group n Rated active power of a single wind turbine generator system S n Rated capacity of a single wind turbine generator system, P eq Is the active output of the equivalent wind turbine generator, P n_eq Is the rated active power of the equivalent wind turbine generator system, S n_eq The rated capacity of the equivalent wind turbine generator system is obtained.
10. The dual machine equivalent modeling system of a wind farm of claim 9, wherein: the equivalent box-section parameters include:
wherein R1 is the current wind turbine generator group matching boxPositive sequence resistance of the transformer, X1 is positive sequence inductance of the box transformer, GM is excitation conductance of the box transformer, BM is excitation susceptance of the box transformer, R1 eq Positive sequence resistor corresponding to equivalent box transformer, X1 eq Positive inductive reactance corresponding to equivalent box transformer, GM eq Excitation conductance corresponding to equivalent box transformer, BM eq The excitation susceptance corresponding to the equivalent box transformer;
the equivalent collector line parameters include:
wherein S is i For the apparent power of a single wind turbine in the current wind turbine group,for the ith typhoon electric machine group current, S eq For equivalent wind turbine apparent power, +.>Is equal to the current of the wind turbine generator system>Is equal to the voltage of the wind turbine generator system>Voltage at low-voltage side of main transformer of wind power plant, Z eq Is equivalent current collecting line impedance;
positive sequence resistor R1 corresponding to equivalent box transformer eq And positive inductive reactance X1 eq The method comprises the following steps of:
where Re is the real part of the complex number and Im is the imaginary part of the complex number.
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