CN113139259B - Wind power plant clustering modeling method for dynamic equivalence of power grid - Google Patents
Wind power plant clustering modeling method for dynamic equivalence of power grid Download PDFInfo
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Abstract
The invention relates to a wind power plant clustering modeling method for dynamic equivalence of a power grid, which specifically comprises the following steps: for the area to be equivalent, wind power plant clustering modeling is realized by sequentially constructing a wind power plant dynamic equivalent model-grid point wind power plant clustering dynamic equivalent model and an equivalent wind power plant clustering dynamic equivalent model in an equivalent network, and a modeling result is applied to electromagnetic transient simulation. Compared with the prior art, the method has the advantages of step-by-step equivalence, simplicity and convenience in method, easiness in implementation, high precision and the like.
Description
Technical Field
The invention relates to the technical field of grid-connected operation of power systems, in particular to a wind power plant clustering modeling method for dynamic equivalence of a power grid.
Background
With the continuous construction of ten million kilowatt-level wind power bases, the centralized grid connection of large-scale wind power generation sets brings huge challenges to the safe and stable operation of a power system, and the construction of a polymerization model capable of accurately describing the overall characteristics of a large-scale wind power plant is a basis for researching the operation and control of a high-proportion wind power system.
The equivalent of the wind power plant adopts two schemes of a single-machine equivalent method and a multi-machine equivalent method, the multi-machine equivalent method is generally adopted at present, namely the whole wind power plant is represented by a plurality of wind generating sets, the wind generating sets with similar working points in the wind power plant are divided into a same group based on the concept of coherent equivalence, and then equivalent parameter calculation of the group set is carried out. Therefore, when multi-machine equivalent modeling is carried out, the accuracy and the effectiveness of the equivalent model of the whole wind power plant are directly influenced by the grouping index selection and the equivalent generator parameter calculation.
In the selection of the grouping indexes, one of the existing methods is to select external environment indexes as the grouping indexes, such as distribution positions, wind speeds of generators entering the wind turbine and a Jensen type wake effect model; the other method is to select the electrical characteristics of the units as grouping indexes, for example, in document 1 (permanent magnet direct drive synchronous Wind Power plant multimachine Dynamic equivalent Model [ J ]. Power system Protection and control, 2013 (14): 25-32.), wind speed, power, transient voltage and transient current of the Wind turbine units are selected as the grouping indexes, in document 2 (Wind Farm Electromagnetic Dynamic Model and output Line Protection delay RTDS Testing [ P ]. University' Power Engineering Conference, proceedings of 2011 46th International, 2011.) the Wind turbine unit control mode is selected as the grouping indexes, and the like. The two indexes have advantages and disadvantages, the former is easy to obtain, and the latter has higher equivalent precision.
The currently common equivalent parameter calculation methods mainly include a capacity weighting equivalent method, a single-machine multiplication, a least square method and an intelligent optimization algorithm, wherein the capacity weighting equivalent method and the single-machine multiplication are simple in thought and small in calculated amount but poor in equivalent precision, and the least square method and the intelligent optimization algorithm can be suitable for complex operation conditions but are complex in algorithm and large in calculated amount.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wind power plant clustering modeling method for power grid dynamic equivalence.
The purpose of the invention can be realized by the following technical scheme:
a wind power plant clustering modeling method for power grid dynamic equivalence specifically comprises the following steps:
for the area to be equivalent, wind power plant clustering modeling is achieved by sequentially constructing a wind power plant dynamic equivalent model-grid point wind power plant clustering dynamic equivalent model and an equivalent wind power plant clustering dynamic equivalent model in an equivalent network, and a modeling result is applied to electromagnetic transient simulation.
The method for constructing the wind power plant dynamic equivalent model specifically comprises the following steps:
for the same wind power plant, modeling is carried out by adopting a method of grouping according to the type of the wind power plant, the wind power plants are aggregated into a plurality of clusters according to the type of the wind power plant and respectively represent the wind power plants of different types, the type of the wind power plant comprises a double-fed asynchronous wind power plant and a permanent magnet direct-drive synchronous wind power plant, and a current collection network is represented by equivalent impedance, namely a dynamic equivalent model of the wind power plant is formed.
For the cluster formed by each type of wind turbine generator, the equivalent model is represented by a typical generator model of the type of wind turbine generator, an equivalent cluster step-up transformer model and a wind turbine cluster aggregation model.
The basic conditions for constructing the wind turbine group aggregation model are as follows:
for the current collection point, the current after aggregation is the sum of all the wind turbine generator currents in the cluster before aggregation, and the voltage of the current collection point is kept unchanged, so that the following steps are provided:
u group ＝niZ/n＝iZ＝u
i group ＝ni
Z group ＝Z/n
wherein u is group For the equal value of the cluster output voltage, i group Output current, Z, for the cluster after equivalence group The equivalent cluster impedance is obtained, n is the number of wind generation sets in the cluster, i is the current of a single wind generation set, u is the voltage of the single wind generation set, and Z is the impedance of the single wind generation set.
The equivalent cluster step-up transformer model is obtained by adopting a parameter aggregation mode, and then the method comprises the following steps:
wherein K is the number of step-up transformers, S N,k Is the capacity, R, of the kth step-up transformer before equivalence k* And X k* Is the resistance reactance per unit value G of the kth step-up transformer before equivalence k* And B k* Respectively the conductance per unit value of the kth step-up transformer before equivalence by S N,k As a reference, S T,group Is equivalent capacity of post-fleet step-up transformer, R Tgroup* ,X Tgroup* Is the per unit value G of the resistance and reactance of the equivalent post-group step-up transformer Tgroup* And B Tgroup* And respectively obtaining the conductance susceptance per unit values of the cluster step-up transformers after the equivalence by taking the system capacity as a reference.
The method for constructing the grouping dynamic equivalent model of the wind power plant of the grid-connected point specifically comprises the following steps:
and for the condition that a plurality of wind power plants are accessed to the same grid-connected point through a line, different types of equivalent wind power units in the dynamic equivalent models of the wind power plants are aggregated into one equivalent wind power unit in a clustering coherent aggregation mode, and after equivalence is performed on the power transmission lines from the current collection points to the grid-connected point, the clustering dynamic equivalent model of the wind power plants of the grid-connected point is obtained.
In the grid-connected point wind power plant clustering dynamic equivalent model, the number of wind turbine sets of a grid-connected point is the sum of all wind turbine sets of the same type connected to the grid-connected point, impedance of a power transmission line is distributed into each cluster equivalent circuit according to capacity to calculate the cluster equivalent step-up transformer parameter of the jth wind power plant, and the impedance is expanded into the cluster equivalent step-up transformer impedance to obtain the equivalent step-up transformer parameter.
The calculation formula of the equivalent step-up transformer parameters of the group of the jth wind power plant is as follows:
wherein R is line,group,j* And X line,group,j* Respectively converting the jth wind power plant grid-connected line into the resistance and reactance per unit value of each cluster grid-connected line, R line,j* And X line,j* Is the per unit value S of the resistance and reactance of the jth wind power plant grid-connected line T,group,j The rated capacity of the equivalent step-up transformer of the group of the jth wind power plant is represented by the group, the group represents the group type, the value range comprises 1-4 wind power unit types, j represents the jth wind power plant which is connected with the internet through the grid-connected point, and the value range is [1,J]。
The calculation formula of the equivalent step-up transformer parameters is as follows:
wherein R is T,group,j* 、X T,group,j* 、G T,group,j* And B T,group,j* The resistance, reactance, conductance and susceptance R of equivalent step-up transformers of the group of the jth wind power plant TA,group* ,X TA,group* And G TA,group* ,B TA,group* And the resistance reactance and the conductance susceptance value of the equivalent wind power plant group step-up transformer which is connected with the grid-connected point A after the equivalence are respectively taken as the reference, and the system capacity is taken as the reference.
The method for constructing the equivalent wind power plant clustering dynamic equivalent model in the equivalent network specifically comprises the following steps:
clustering dynamic equivalent models of the wind power plants at the grid-connected points by adopting a coherent aggregation mode, constructing the equivalent wind power plant clustering dynamic equivalent models by adopting a unit type clustering equivalent mode, and calculating the equivalent impedance of the network by adopting a mode of calculating the short circuit impedance of the access point.
Compared with the prior art, the invention has the following advantages:
the invention provides an engineering practical method for wind power plant clustering modeling of power grid dynamic equivalence, which is characterized in that wind power plant dynamic equivalence is performed in a step-by-step equivalent mode, cluster, wind power plant and network equivalence containing a plurality of wind power plants are sequentially completed, and a calculation formula of aggregate equivalence of all parameters is given.
Drawings
FIG. 1 is a schematic diagram of a wind farm.
FIG. 2 is a wind farm clustering model.
FIG. 3 is an equivalent model of an internal network including a wind power plant.
FIG. 4 is a schematic diagram of a 500kV subordinate system including a wind farm.
FIG. 5 is a wind power plant clustering dynamic equivalent model.
Fig. 6 is a grid-connected point wind farm clustering equivalence model, wherein fig. 6a is a grid-connected point wind farm clustering access schematic diagram, and fig. 6b is a grid-connected point wind farm clustering equivalence schematic diagram.
FIG. 7 is a wind power plant dynamic equivalent model in an equivalent reduction network.
FIG. 8 is a schematic diagram of a group of generators identically followed by an identical generator bus.
FIG. 9 is a YD-YX local network connection.
FIG. 10 is a YX-YD area network after equivalence.
FIG. 11 is a YD51 voltage profile.
Fig. 12 is a PD51 voltage graph.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
The technical content of the invention is the dynamic equivalence of a plurality of wind power plants in an equivalence area, and the model obtained by equivalence is applied to electromagnetic transient simulation, so that the transient characteristic analysis (such as transient fault monitoring, control strategy optimization and other specific application scenes) can be carried out on a power grid to be researched, namely, the engineering practical equivalence processing method of the plurality of wind power plants in the equivalence area is carried out in the process of carrying out internal and external equivalence on the related equivalence area on the basis of the existing regional power grid electromechanical transient steady-state model (BPA data file) containing the position of the wind power plants, the unit capacity and the composition.
According to the method, firstly, the technical conception and steps of modeling are introduced, then, the clustering equivalent modeling step of the regional wind power plant in the dynamic equivalence of the inside and the outside of the power grid is specifically realized according to the modeling step description, and finally, the feasibility and the effectiveness of the method are verified through an actual example.
1. Modeling concept
Because wind power resource distribution has regionality, a plurality of wind power plants are built in a region with rich wind power resources and are merged into a power grid from adjacent nodes, as shown in fig. 4, a plurality of 220kV nodes with wind generating sets exist in a 220kV local power grid under the 500kV node, and a plurality of wind power plants are accessed under each 220kV node. When equivalence is carried out on a 500kV node subordinate area power grid, dynamic equivalence modeling related to a wind power plant comprises 3 parts of contents:
1. dynamic equivalent modeling of a wind power plant: the wind farm clustering and aggregating equivalent model is called model I, and corresponds to a wind farm in a wire frame at the lowest part in fig. 2, the specific structure of the wind farm is shown by the content of a solid line frame in fig. 1, and the clustered and aggregated model is shown in fig. 2.
2. Dynamic equivalent modeling of a wind power access point: the grid-connected point wind power dynamic equivalent model is called as a model II, and is shown as a grid-connected point equivalent wind power plant model in a dotted line rectangular frame in FIG. 4.
3. Dynamic equivalent modeling of a wind farm contained in a simplified network: the wind power dynamic equivalent model in the simplified network is called as a model III, namely the equivalent of all wind power plants in the equivalent part in FIG. 4 is aggregated into an equivalent wind power plant and then is accessed into a reserved network through the equivalent impedance of the network.
As can be seen from fig. 1 to 4, modeling of the wind power plant of the grid-connected point is performed in a stepwise equivalence simplification manner; firstly, carrying out equivalent modeling on a wind power plant to obtain a wind power plant equivalent model of a model I; and then carrying out equivalence aggregation on equivalent wind power plants at the same grid-connected point to obtain an equivalent wind power plant access model of the grid-connected point, as shown in a model II. For the model III, the generators are still aggregated in a mode of homodyne equivalence, but the calculation mode of equivalent step-up transformer parameters is different.
In practical application, because the wind power plant can be merged into the main network through various voltage levels of 500kV, 220kV or 35kV and the like, a model I, a model II and a model III may exist in the finally obtained wind power plant equivalent model, and various equivalent models and modeling processes thereof are explained below.
1.1 equivalent model structure of wind power plant
In a wind farm, wind turbines are connected together through an internal power collection network, as shown in fig. 1, the wind turbines are divided into a plurality of clusters and are merged into a 35kV power collection point through cables, and because the wind farm is usually built in batches, the types and models of the clusters may be different.
(1) Model I: wind power plant dynamic equivalent model
Considering that for the same wind power plant, due to the fact that the geographic positions are close, the wind receiving conditions of the wind generation sets can be approximately considered to be the same, and meanwhile, the dynamic performance of the wind generation sets of the same type is approximately considered to be similar, from the perspective of engineering practicality, the wind power plant is modeled by a method of grouping according to the type of the wind generation sets, as shown in a dashed line frame of fig. 2. In fig. 2, wind turbine generators are aggregated into 4 groups according to the type of the wind turbine generators, and the groups represent I-IV type wind turbine generators (which correspond to each other from top to bottom in fig. 2) respectively, where the type III wind turbine generator is a double-fed asynchronous wind turbine generator, the type IV wind turbine generator is a permanent-magnet direct-drive synchronous wind turbine generator, and the current collection network is represented by equivalent impedance, that is, a wind farm dynamic equivalent model is formed.
(2) Model II: grouping dynamic equivalent model of wind power station of grid-connected point
The condition that a plurality of wind power plants are connected to the same grid-connected point through a line is considered by adopting the model. Different types of equivalent wind turbine generators in the dynamic equivalent model (model I) of each wind power plant are aggregated into one equivalent wind turbine generator, namely the equivalent wind power plant comprises four equivalent wind turbine generators, and then the power transmission lines from the collecting points to the grid-connected points are equivalent to obtain the clustered dynamic equivalent model of the wind power plant at the grid-connected points, wherein the model structure is shown in a dotted line rectangular frame in figure 4.
(3) Model III: equivalent wind power station clustering dynamic equivalent model in equivalent network
The equivalent wind turbine generator sets adopt a coherent aggregation mode, dynamic equivalent models of different grid-connected point wind power plant clustering are aggregated, the model I is similar to the model II, the model III still adopts a wind power plant model which is clustered and equivalent into 4 equivalent wind turbine generator sets according to the type of the wind turbine generator sets, and the network equivalent impedance is calculated and obtained in a mode of calculating access point short circuit impedance.
1.2 modeling Process
In this example, the modeling process of various wind power plant models is introduced according to the sequence of model I → model II and model III.
1.2.1 wind farm dynamic equivalent model modeling (model I)
The modeling of the wind power plant dynamic equivalent model comprises the grouping dynamic equivalence of wind turbine generators and the calculation of equivalent step-up transformer parameters of each group.
1.2.1.1 wind power plant clustering dynamic equivalent model
As shown in fig. 2, the units in the wind farm are divided into 4 different types of clusters, the units of the same type are aggregated into an equivalent cluster, and the equivalent cluster is represented by a typical unit model of the type of wind turbine, an equivalent cluster step-up transformer and a wind turbine aggregation model, as shown in fig. 5.
(1) Wind turbine group aggregation model
The basic conditions for establishing the wind turbine cluster aggregation model are as follows: for the collecting point, the current after aggregation is the sum of all wind turbines in the cluster before aggregation, and the voltage of the collecting point is kept constantAnd (6) changing. The voltage of the current collection point is set as u, and the current which is sent to the current collection point by a single fan through a current collection line after passing through a transformer is set as i k And = i, k =1,2 and … n, and the current source parallel admittance is expressed in a norton equivalent mode for each unit. Taking into account the losses of the wind turbine in the collector network, using a parallel impedance Z k = Z, k =1,2, …, n denotes. The output current of the equivalent machine group is i group ＝ni,Z group = Z/n, voltage after equivalence:
u group ＝niZ/n＝iZ＝u (1)
i.e. the voltage at the collection point remains constant before and after the equivalence.
(2) Equivalent cluster step-up transformer parameter solving method
The 35/242kV transformer model at the outlet of the cluster is obtained by adopting a parameter aggregation mode, namely:
wherein K is the number of step-up transformers, S N,k Is the capacity, R, of the kth step-up transformer before equivalence k* And X k* Is the resistance reactance per unit value G of the kth step-up transformer before equivalence k* And B k* Respectively the conductance per unit value of the kth step-up transformer before equivalence by S N,k As a reference, S T,group Is equivalent capacity of post-fleet step-up transformer, R Tgroup* ,X Tgroup* Is the per unit value G of the resistance and reactance of the equivalent post-group step-up transformer Tgroup* And B Tgroup* Respectively, the conductance per unit value of the cluster step-up transformer after the equivalence, and taking the system capacity as the reference.
1.2.1.2 dynamic equivalence model modeling of wind power station grouping of grid-connected point (model II)
The equivalent aggregation of a plurality of wind power plants at a grid-connected point also adopts a cluster coherent aggregation model, as shown in a figure (6 b).
The equivalent parameters of the wind power plant cluster aggregation model and the step-up transformer of the grid-connected point are calculated as follows:
impedance Z for line from wind power plant j to grid connection point line,j And representing that the number of the wind turbine generators of the same grid-connected point is the sum of all the wind turbine generators of the same type connected to the grid-connected point.
When calculating the equivalent step-up transformer parameters of the first group of the kth wind power plant, firstly, the impedance of the power transmission line is distributed into the equivalent circuits of all the wind farms according to the capacity, and the calculation formula is shown as a formula (5). And then, the impedance is increased to the cluster equivalent step-up transformer impedance to obtain equivalent step-up transformer parameters, as shown in calculation formulas (6) and (7).
Wherein, group represents the cluster type, the value range includes 1-4 wind turbine generator types, j represents the jth wind power station accessing the internet through the grid-connected point, and the value range is [1,J ]]。S T,group,j Equivalent boost transformer rated capacity R for the group of the jth wind power plant line,j* And X line,j* Is the resistance and reactance per unit value R of the jth wind power plant grid-connected line respectively line,group,j* And X line,group,j* Respectively converting the jth wind power plant grid-connected line into the resistance and reactance per unit value of each cluster grid-connected line, R T,group,j* 、X T,group,j* 、G T,group,j* And B T,group,j* The resistance, reactance, conductance and susceptance R of equivalent step-up transformers of the group of the jth wind power plant TA,group* ,X TA,group* And G TA,group* ,B TA,group* And the resistance reactance and the conductance susceptance value of the equivalent wind power plant group step-up transformer which is equivalent and then connected to the grid-connected point A are respectively obtained, and the system capacity is taken as the reference.
1.2.1.3 wind power plant dynamic equivalent model in equivalent simplification network
When the equivalent network contains a plurality of wind power plant grid-connected points, a wind power plant dynamic equivalent model is obtained by adopting a clustering and homodyne equivalent method. The model structure is similar to the wind power plant clustering dynamic equivalent model of the grid-connected point in the upper section. As shown in fig. 7.
The typical wind turbine, the booster transformer and the wind power plant aggregation model are not changed, and the number of the wind turbine generators in the wind power plant aggregation is the sum of all the wind turbine generators of the type in the equivalent region. The distribution network impact of equivalent collection points into 500kV nodes is represented by 35/242kV regional cluster equivalent transformers.
When an original system model based on BPA software is adopted, firstly, wind turbine generators are represented by power supplies in a power flow file, wind turbine generator groups of a grid-connected point are replaced by thermal power generators in a stable file, and a Reduction function is adopted to carry out network simplification so as to obtain the unit distribution condition on each reserved node. The mechanism is shown in the following chart:
after Reduction simplification is adopted, the system equates all the units into a cluster and hangs the cluster on an equivalence machine bus. Firstly, separating out a thermal power engine group, and carrying out parameter aggregation calculation as shown in the following; and then aggregating the fans of different types into 1-4 wind power plant groups according to the types, and calculating equivalent wind power plant groups of the same wind power plant according to parameters.
Step-up transformer T for fan group eqi I =1,2,3,4, and the method adopts the condition that the equivalent front and rear power flows are consistent to calculate. Recording the voltage of the 500kV side of the equivalent bus voltage after equivalence as U eq500 ∠θ 500 Expressed in per unit value; the outlet voltage of the equivalent wind power station group is taken as the average value of each wind power station in the groupIs marked as U qi,av220 ∠θ qi,220 Expressed in per unit value; sum of 220kV outlet side powers, noted
The transformation ratio of the transformer is 1, then
Examples
In this example, the specific steps are described by taking the equivalent of the wind turbine component groups in the equivalent network of YD and YX to 500kV as an example. As shown in fig. 9, the equivalent network between YD transformation and YX transformation includes a thermal power generating unit SYG5 (rated power 660 MW), and the wind power generating units are configured as shown in table 1. Typical fans for equivalent modeling adopt GE1.5MW doubly-fed fans and GE2.5 permanent magnet direct-drive fans.
TABLE 1 wind turbine conditions in SAYOU-SAXIE isovalent network
After the Reduction in BPA, the network of reserved nodes is shown in fig. 10. The node unit aggregation condition is as follows: combining the TH, TD, YH and XY permanent magnetic direct drive units into a permanent magnetic direct drive machine group named TH; and the number of the devices is 140. The HD and LW double-fed machines are combined into a double-fed machine group named LW. The impedance of the transformer between LW21 and the equivalent machine 51 is 0.0459+ j0.0523, and the impedance of the transformer between TH22 and the equivalent machine 51 is 0.0459+ j0.0523; the transformer impedance between LW21 and iso-machine 51 is 0.0431+ j837.
And performing fault simulation on the system before equivalence and the system after equivalence. Stably calculating a BPA original network (generator detailed modeling in YD-YX220kV network) and a BPA simplified network (YD-YX 500kV equivalent network comprises a wind turbine generator group clustering equivalent model), wherein the calculation conditions are as follows: the PD51 node has three-phase metallic grounding for 0.1 second and 0.2 second fault vanished. The BPA pristine network, the stability results of the BPA simplified network are shown in fig. 11 and 12.
From the results, the change rules of the two are similar, which shows that the wind turbine generator clustering equivalent modeling method is feasible.
Claims (7)
1. A wind power plant clustering modeling method for power grid dynamic equivalence is characterized by comprising the following steps:
for the area to be equivalent, wind power plant clustering modeling is realized by sequentially constructing a wind power plant dynamic equivalent model-grid point wind power plant clustering dynamic equivalent model and an equivalent wind power plant clustering dynamic equivalent model in an equivalent network, and a modeling result is applied to electromagnetic transient simulation;
the method for constructing the wind power plant dynamic equivalent model specifically comprises the following steps:
for the same wind power plant, modeling is carried out by adopting a method of grouping according to the type of the wind power plant, the wind power plants are aggregated into a plurality of clusters according to the type of the wind power plant and respectively represent the wind power plants of different types, the type of the wind power plant comprises a double-fed asynchronous wind power plant and a permanent magnet direct-drive synchronous wind power plant, and a current collection network is represented by equivalent impedance, namely a dynamic equivalent model of the wind power plant is formed;
the method for constructing the grouping dynamic equivalent model of the wind power plant of the grid-connected point specifically comprises the following steps:
for the condition that a plurality of wind power plants are connected to the same grid-connected point through a line, different types of equivalent wind power units in the dynamic equivalent models of the wind power plants are aggregated into one equivalent wind power unit in a clustering coherent aggregation mode, and after the equivalence is carried out on the power transmission lines from the current collection points to the grid-connected point, the clustered dynamic equivalent models of the wind power plants of the grid-connected point are obtained;
the method for constructing the equivalent wind power plant clustering dynamic equivalent model in the equivalent network specifically comprises the following steps:
clustering dynamic equivalent models of the wind power plants at the grid-connected points by adopting a coherent aggregation mode, constructing the equivalent wind power plant clustering dynamic equivalent models by adopting a unit type clustering equivalent mode, and calculating the equivalent impedance of the network by adopting a mode of calculating the short circuit impedance of the access point.
2. The wind power plant clustering modeling method for grid dynamic equivalence according to claim 1, characterized in that, for a cluster formed by each type of wind power plant, an equivalent model is represented by a typical plant model of the type of wind power plant, an equivalent cluster step-up transformer model and a wind power plant cluster aggregation model.
3. The wind power plant clustering modeling method for power grid dynamic equivalence according to claim 2, characterized in that basic conditions for constructing a wind power plant cluster aggregation model are as follows:
for the current collection point, the current after aggregation is the sum of all the wind turbine generator currents in the cluster before aggregation, and the voltage of the current collection point is kept unchanged, so that the following steps are provided:
u group ＝niZ/n＝iZ＝u
i group ＝ni
Z group ＝Z/n
wherein u is group For the equalized cluster output voltage i group Outputting current, Z, for the cluster after equivalence group The equivalent cluster impedance is obtained, n is the number of wind generation sets in the cluster, i is the current of a single wind generation set, u is the voltage of the single wind generation set, and Z is the impedance of the single wind generation set.
4. The wind power plant clustering modeling method for grid dynamic equivalence according to claim 2, wherein an equivalent fleet step-up transformer model is obtained in a parameter aggregation manner, and the method comprises the following steps:
wherein K is a boost pressureNumber of transformers, S N,k Equal to the capacity of the kth step-up transformer before the equivalence,
and
respectively the resistance reactance per unit value of the kth step-up transformer before the equivalence,
and
respectively the conductance per unit value of the kth step-up transformer before equivalence by S N,k As a reference, S T,group Is equal to the capacity of the post-fleet step-up transformer,
respectively is a per unit value of the resistance reactance of the cluster step-up transformer after the equivalence,
and
respectively, the conductance per unit value of the cluster step-up transformer after the equivalence, and taking the system capacity as the reference.
5. The wind power plant clustering modeling method for power grid dynamic equivalence according to claim 1, characterized in that in a grid-connected point wind power plant clustering dynamic equivalence model, the number of wind power sets at a grid-connected point is the sum of all wind power sets of the same type connected to the grid-connected point, impedance of a power transmission line is allocated to each cluster equivalence circuit according to capacity to calculate the equivalent step-up transformer parameter of the group of the jth wind power plant, and the impedance is increased to the cluster equivalent step-up transformer impedance to obtain the equivalent step-up transformer parameter.
6. The wind farm clustering modeling method for grid dynamic equivalence according to claim 5, characterized in that the calculation formula of the equivalent step-up transformer parameters of the group of the jth wind farm is as follows:
wherein,
and
respectively converting the jth wind power plant grid-connected line into the resistance and reactance per unit value of each cluster grid-connected line,
and
is the per unit value S of the resistance and reactance of the jth wind power plant grid-connected line T,group,j The rated capacity of the equivalent step-up transformer of the group of the jth wind power plant is represented by the group, the group represents the group type, the value range comprises 1-4 wind power unit types, j represents the jth wind power plant which is connected with the internet through the grid-connected point, and the value range is [1,J]。
7. A wind farm clustering modeling method for grid dynamic equivalence according to claim 6, characterized in that the calculation formula of equivalence step-up transformer parameters is as follows:
wherein,
and
respectively equal to the resistance, reactance, conductance and susceptance of the boosting transformer of the group of the jth wind power plant,
and
and the resistance reactance and the conductance susceptance value of the equivalent wind power plant group step-up transformer which is connected with the grid-connected point A after the equivalence are respectively taken as the reference, and the system capacity is taken as the reference.
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