CN107069702B - Large wind power plant equivalence method for online safety analysis based on in-station topology - Google Patents
Large wind power plant equivalence method for online safety analysis based on in-station topology Download PDFInfo
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Abstract
The invention discloses a large wind power plant equivalence method for online safety analysis based on in-station topology, and belongs to the technical field of power system operation control. According to the method, firstly, grouping is carried out according to the topological connection relation of the units, the generator-end transformer and the feeder line, then the wind turbine generators in each group are grouped according to the on-off state, the rated active power, the stable parameters, the protection fixed value, the type, the active power and the pitch angle in sequence, grouping information comprising the grouping condition of the units in the wind farm, the grouping condition of the units in the group and the grouping condition of the units in the group is obtained, on the basis, various parameters such as the rated active power, the active power upper and lower limits, the active power and the reactive power of the equivalent wind turbine generators and the equivalent generator-end transformer corresponding to each group are obtained, and the grouping result is output. The method comprehensively considers the calculation speed and the calculation precision, can effectively improve the simulation precision while ensuring the speed of the simulation calculation, and is suitable for being applied to the online safety analysis calculation of the power grid.
Description
Technical Field
The invention belongs to the technical field of power system operation control, and particularly relates to a large wind power plant equivalence method for online safety analysis based on in-station topology.
Background
With the rapid development of wind power technology, more and more large wind power plants are connected into a power grid, the installed number of the wind power plants of the large wind power plants can reach hundreds or even thousands of wind power plants, the total installed capacity can reach hundreds or even gigawatts, the operation characteristics of the wind power plants have certain influence on the operation of a power system, and the influence of the large wind power plants on the safety and stability characteristics of the power grid needs to be considered when the online safety analysis and calculation of the power grid are carried out.
Electromechanical transient simulation is an important means for researching the influence of a wind power plant on a power system. Generally speaking, the more detailed the wind power plant modeling is, even if a detailed model is established for each wind power generation unit according to specific wiring and actual operation conditions, the calculation accuracy of simulation calculation is correspondingly improved. However, the wind power generation sets with hundreds or even thousands of single machines and small capacity adopt detailed models, the number of differential equations is obviously increased, the models are complex and large in scale, the calculation time is long, and the requirement of online safety analysis on the calculation speed is not met, so that the method is not suitable for engineering application. At present, when safety and stability analysis and calculation are carried out in a power grid offline mode, a wind power plant is generally equivalent to 1-2 equivalent machines; in the online safety and stability analysis, a low-voltage network where the wind power plant is located is generally not modeled, the whole wind power plant is generally equivalent to a negative load at the 220kV/330kV side of the wind power plant connected to a power grid, and the dynamic characteristic of the wind power plant is ignored. With the rapid increase of installed capacity of wind power and the increasing improvement of the requirement on the accuracy of online safety analysis and calculation, the wind power generation set needs to be properly processed, the dynamic characteristics of the wind power plant are reasonably considered, the accuracy of simulation calculation is improved as much as possible on the premise of meeting the calculation speed, and the requirement on online safety analysis and application is met.
The existing wind power plant equivalence method generally divides wind power generation sets in a wind power plant into a plurality of groups according to certain characteristic quantities, and performs equivalence processing on the basis to obtain relevant information of an equivalence machine. In a document, a dynamic equivalence method for a large wind farm with double-fed wind turbines (patent application number: 201110162399X), the influence of input wind speed on equivalence calculation of the wind farm is considered, the wind turbines are grouped according to the characteristics (average value and variance of wind speed) of the input wind speed of each wind turbine, the wind turbines with the same model and similar wind speed are defined as a group, and the wind turbines in the same group are equivalent to be one machine; the equivalent machine has the same model as a single wind driven generator of the type, and the rated capacity of the equivalent machine is equal to the sum of the rated capacities of the wind generating sets represented by the equivalent machine. In the document, "equivalent modeling method based on wind speed distribution characteristics in a wind farm" (patent application number: 2013103483998), wind turbines in the farm are grouped according to terrain conditions, each group comprises a plurality of clusters, a simplified mechanical model is established for each cluster, so that an equivalent single-machine electrical model of the whole wind farm is established, the set value of the direct-current bus voltage is set to be the same as that of a single machine, the pulse width modulation control strategies of the power grid side and the rotor side are replaced by an equivalent controlled voltage source, and an equivalent converter model is established. The wind power plant equivalence method does not consider the actual connection relation in the wind power plant, and the divided equivalence cluster and the actual connection mode of the wind power generator set are different; only a small amount of information is used as characteristic quantity to divide the groups, the granularity of the divided equivalent cluster is still larger, and the unit groups in the same group may still have larger difference.
In fact, due to the rapid development of wind power, research and development and application of a supporting system related to wind power are also rapidly developed, at present, various production management software such as a wind power prediction system, a real-time monitoring system of a wind power plant and the like are generally installed in a large wind power plant, and static model parameter information such as rated power of the wind power plant, model number of the wind power plant, type of the wind power plant, topological connection relation between the wind power plant and a feeder line and a generator-end transformer and the like, and real-time information such as actually measured active power, reactive power, wind speed, pitch angle and the like of the wind power plant can be provided, and various kinds of data such as protection parameters of the wind power plant and generator-end transformer parameters.
Disclosure of Invention
The invention aims to: in order to solve the problem of how to perform equivalence on a large wind power plant during online safety analysis, a large wind power plant equivalence method for online safety analysis based on in-station topology is provided. The method can realize rapid and accurate equivalent processing of the large wind power plant, and meets the requirements of online safety analysis on calculation speed and calculation precision.
The main principle of the invention is as follows: the method comprises the steps of obtaining relevant data information such as measured data of a wind power plant, static model parameters, offline configuration wind turbine generator protection parameters and generator-end transformer parameters, grouping according to the in-station topological relation of the wind power plant, sequentially grouping according to the on-off state, the type of the wind turbine generator, rated active power, stable parameters, protection fixed values, active power and pitch angle information, dividing all the wind turbine generators and corresponding generator-end transformers into a plurality of groups, each group comprises a plurality of wind turbine generators, and calculating parameters such as rated active power, active power upper and lower limits, active power and reactive power of equivalent wind turbine generators and equivalent transformers on the basis to meet the requirements of online safety analysis and calculation.
Specifically, the technical scheme adopted by the invention comprises the following steps:
1) the method comprises the following steps of acquiring data information of each wind power plant from an external system, wherein the data information specifically comprises the following information:
real-time information of the wind turbine generator: the method comprises the steps of generating active power, reactive power, a switching state, wind speed and pitch angle of a wind turbine generator;
static model parameters of the wind turbine generator: the method comprises the steps of determining the wind power type, the rated power of a unit, the upper and lower limits of active and reactive power, the upper and lower limits of pitch angle, the stability parameters of the wind power unit, the topological connection relation information between the wind power unit and a feeder line and the topological connection relation information between the wind power unit and a generator-end transformer;
protection parameters of the wind turbine generator: the method comprises high/low frequency protection fixed value and time limit, and high/low voltage protection fixed value and time limit;
parameters of the wind turbine generator-end transformer: the transformer comprises a transformer type, high-low voltage winding resistance, reactance, conductance, susceptance and high-low voltage side voltage levels;
on the basis of obtaining the information, according to the reasonable range of the equipment parameters and by combining with the judgment of an expert system, carrying out rationality check on the obtained data and correcting errors and suspicious data in the data;
2) according to the information obtained in the step, wind generation sets of the wind farm are grouped according to the topological connection relation between the wind generation sets and the feeder lines, and the wind generation sets in the wind farm are divided into a plurality of groups; dividing the transformer at the generator terminal into a plurality of groups according to the topological connection relation between the transformer and the feeder line; (ii) a On the basis, the wind turbine generators in each group are grouped according to the on-off state, the type of the wind turbine generator, the rated active power, the stable parameter, the protection constant value, the active power and the pitch angle in sequence to obtain grouping information comprising the grouping condition of the wind turbine generators, the grouping condition in the group and the grouping condition of the wind turbine generators, and the step 3 is carried out;
3) according to the grouping result, equating the wind turbine generator in each group to be an equivalent machine, solving the equivalent power, the rated power, the equivalent wind speed of each equivalent machine set and the impedance, the admittance and the rated capacity of each equivalent machine-side transformer, equating the machine-side transformer in each group to be an equivalent transformer, solving the rated capacity, the impedance and the admittance of each equivalent transformer, and entering the step 4);
4) and outputting equivalent result information of the wind power plant, and providing the equivalent result of the wind power plant for online safety analysis.
The technical scheme is further characterized in that the step 2) specifically comprises the following steps:
2-1) grouping the wind turbine generators in the wind power plant according to the topological connection relationship between the wind turbine generators and the feeder lines, and dividing the wind turbine generators connected to the same feeder line into the same group;
2-2) grouping generator-side transformers in the wind power plant according to the topological connection relation with the feeder lines, and dividing the generator-side transformers connected to the same feeder line into the same group; 2-3) grouping the wind turbine generators in each group according to the starting and stopping conditions, wherein the started wind turbine generators are divided into the same group, and the stopped wind turbine generators are divided into another group;
2-4) grouping the wind turbine generators in each group according to the types of the wind turbine generators, wherein the wind turbine generators are divided into the same group in the same type, and the types of the wind turbine generators comprise constant speed, double feed and direct drive;
2-5) further grouping according to the rated active power of each wind turbine, and dividing the wind turbines with the same rated active power or close rated active power (the rated active power is judged to be close within +/-5%);
2-6) further grouping according to the stable parameters of the wind turbine generator, wherein the stable parameters are divided into the same group;
2-7) further grouping according to the protection constant value of the wind turbine generator, and dividing the wind turbine generator into the same group with the same protection constant value;
2-8) aiming at the grouping with the type of double-fed or direct-driven, further dividing the wind turbine generators in the group into the following 3 groups according to the active power of the wind turbine generators:
● active power is greater than 0 and less than Pset
● active power is greater than or equal to PsetAnd less than 1.0pu
● active power equals 1.0pu
Wherein P issetSetting a per unit system for presetting an active power threshold value according to actual engineering requirements;
2-9) for the grouping with the type of double-fed or direct-driven and the active power equal to 1pu, further dividing the units in the group into the following 3 groups according to the pitch angle:
● Pitch Angle equal to lower limit rating βmin
● Pitch Angle equal to the Upper rating βmax
● having a pitch angle greater than the lower limit value betaminless than the rated upper limit betamax
In the grouping process of steps 2-5), 2-6), 2-7), 2-8) and 2-9), if the number of groups in the group is more than that in the grouping processNmaxIf yes, the step of grouping is abandoned, and the grouping is directly finished; otherwise, the step of grouping is accepted, and the next step is carried out; n is a radical ofmaxAnd setting the maximum grouping number according to the actual engineering requirements.
The technical scheme is further characterized in that the rated active power of each wind turbine generator is judged to be close within +/-5%.
The technical scheme is further characterized in that the method for equating the wind turbine generator in each group to be an equivalent machine in the step 3) is as follows:
the rated active power of the equivalent machine is equal to the sum of the rated active power of each wind turbine generator set in the group;
the upper limit of active power of the equivalent machine is equal to the sum of rated active power of each wind turbine generator set in the group;
the lower limit of active power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the active power of the equivalent machinePMin；
The active power of the equivalent machine is equal to the sum of the active power of each wind turbine generator in the group;
the reactive power of the equivalent machine is equal to the sum of the reactive power of all the wind turbine generators in the group;
the number of the wind turbine generators of the equivalent machine is equal to the total number of the wind turbine generators in the group;
the upper limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the upper limit coefficient K of the reactive power of the equivalent machineQMax；
The lower limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the reactive power of the equivalent machineQMin；
The rated capacity of the single machine is equal to the rated capacity of the equivalent machine divided by the number of the wind turbine generators of the equivalent machine;
on the basis of grouping the transformers at the generator end in the step 2-2), equating each transformer in the group as one transformer:
the rated capacity of the equivalent transformer is equal to the sum of the rated capacities of the operating transformers in the group;
the resistance and reactance of the equivalent transformer are equal to the parallel resistance and reactance of the operating transformers in the group;
the conductance and susceptance of the equivalent transformer are equal to the parallel conductance and susceptance of the operation transformers in the group.
The invention has the beneficial effects that: compared with the traditional wind power plant equivalence method, the wind power plants in the whole wind power plant are grouped according to the in-station topology of the wind power plant, the wind power plants in the whole wind power plant are grouped according to various types of characteristic quantities such as the starting and stopping state, the type of the wind power plant, the rated active power, the stable parameters, the protection fixed value, the active power and the pitch angle, the divided wind power plant groups are consistent with the actual connection relation of the wind power plants, the group relation is clear and easy to understand, the wind power plants with different types and different parameters can be compatible, the divided groups are moderate in granularity, and the wind power plant equivalence method has the advantages of high processing speed and high equivalence precision and is suitable for being applied to online safety analysis and.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The method of the present invention will be described in detail below with reference to the accompanying drawings.
Step 1) in the attached drawings describes that the method for acquiring the wind turbine generator measured data, the static model information, the wind turbine generator protection parameters and the generator-end transformer parameter information provided by the external system specifically comprises the following steps: the real-time information of the wind turbine generator such as active power, reactive power, a switching state, wind speed and pitch angle of the wind turbine generator; wind power type, set rated power, upper and lower limits of active and reactive power, upper and lower limits of pitch angle, wind power set stability parameters, wind power set static model parameters such as topological connection relation information of the wind power set and a feeder line, and topological connection relation of the wind power set and a terminal transformer: high/low frequency protection fixed value and time limit, high/low voltage protection fixed value and time limit equal wind turbine generator protection parameters: transformer parameters of the wind turbine generator terminal, such as transformer type, impedance and admittance of high and low voltage windings, voltage grade of high and low voltage sides and the like; on the basis of obtaining the information, according to the reasonable range of the equipment parameters and by combining with the judgment of an expert system, carrying out rationality check on the obtained data and correcting errors in the data;
step 2) in the attached drawings describes that wind turbines of a wind farm are grouped according to the topological connection relation between the wind turbines and feeder lines according to the information obtained in the step, and the wind turbines in the wind farm are divided into a plurality of groups; dividing the transformer at the generator end into a plurality of groups according to the topological connection relation between the transformer at the generator end and the feeder line; on the basis, the wind turbine generators in each group are grouped according to the on-off state, the type of the wind turbine generator, the rated active power, the stable parameter, the protection constant value, the active power and the pitch angle in sequence to obtain grouping information comprising the grouping condition of the wind turbine generators, the grouping condition of the wind turbine generators and the grouping condition of the wind turbine generators. The method specifically comprises the following steps:
2-1) grouping the wind turbine generators in the wind power plant according to the topological connection relationship between the wind turbine generators and the feeder lines, and dividing the wind turbine generators connected to the same feeder line into the same group;
2-2) grouping generator-side transformers in the wind power plant according to the topological connection relation with the feeder lines, and dividing the generator-side transformers connected to the same feeder line into the same group;
2-3) grouping the wind turbine generators in each group according to the starting and stopping conditions, wherein the started wind turbine generators are divided into the same group, and the stopped wind turbine generators are divided into another group;
2-4) grouping the wind turbine generators in each group according to the types of the wind turbine generators, wherein the wind turbine generators are divided into the same group in the same type, and the types of the wind turbine generators comprise constant speed, double feed and direct drive;
2-5) further grouping according to the rated active power of each wind turbine, and dividing the wind turbines with the same rated active power or close rated active power (the rated active power is judged to be close within +/-5%);
2-6) further grouping according to the stable parameters of the wind turbine generator, wherein the stable parameters are divided into the same group;
2-7) further grouping according to the protection constant value of the wind turbine generator, and dividing the wind turbine generator into the same group with the same protection constant value;
2-8) aiming at the grouping with the type of double-fed or direct-driven, further dividing the wind turbine generators in the group into the following 3 groups according to the active power of the wind turbine generators:
● active power is greater than 0 and less than Pset
● active powerGreater than or equal to PsetAnd less than 1.0pu
● active power equals 1.0pu
Wherein P issetSetting a per unit system for presetting an active power threshold value according to actual engineering requirements;
2-9) for the grouping with the type of double-fed or direct-driven and the active power equal to 1pu, further dividing the units in the group into the following 3 groups according to the pitch angle:
● Pitch Angle equal to lower limit rating βmin
● Pitch Angle equal to the Upper rating βmax
● having a pitch angle greater than the lower limit value betaminless than the rated upper limit betamax
The rated upper and lower limits of the pitch angle of the fan are the design parameter values of the fan equipment.
In the grouping process of steps 2-5), 2-6), 2-7), 2-8) and 2-9), if the number of groups in the group is more than N after groupingmaxIf yes, the step of grouping is abandoned, and the grouping is directly finished; otherwise, the step of grouping is accepted, and the next step is carried out; n is a radical ofmaxAnd setting the maximum grouping number according to the actual engineering requirements.
Step 3) in the attached drawing describes that the wind turbine generator in each group is equivalent to an equivalent machine according to the grouping result, and the equivalent power, the rated power, the equivalent wind speed of each equivalent machine and the impedance, the admittance and the rated capacity of a transformer at the end of each equivalent machine are obtained; and equating the terminal transformers in each group to be one equivalent transformer, and solving the rated capacity, impedance and admittance of each equivalent transformer. The method for equating the wind turbine generator in each group into an equivalent machine is as follows:
the rated active power of the equivalent machine is equal to the sum of the rated active power of each wind turbine generator set in the group;
the upper limit of active power of the equivalent machine is equal to the sum of rated active power of each wind turbine generator set in the group;
the lower limit of active power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the active power of the equivalent machinePMin，KPMinGenerally taking 0.02;
the active power of the equivalent machine is equal to the sum of the active power of each wind turbine generator in the group;
the reactive power of the equivalent machine is equal to the sum of the reactive power of all the wind turbine generators in the group;
the number of the wind turbine generators of the equivalent machine is equal to the total number of the wind turbine generators in the group;
the upper limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the upper limit coefficient K of the reactive power of the equivalent machineQMax，KQMaxGenerally taking 0.4;
the lower limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the reactive power of the equivalent machineQMin，KQMinGenerally, take-0.4;
the rated capacity of the single machine is equal to the rated capacity of the equivalent machine divided by the number of the wind turbine generators of the equivalent machine;
on the basis of grouping the transformers at the generator end in the step 2-2), equating each transformer in the group as one transformer:
the rated capacity of the equivalent transformer is equal to the sum of the rated capacities of the operating transformers in the group;
the resistance and reactance of the equivalent transformer are equal to the parallel resistance and reactance of the operating transformers in the group;
the conductance and susceptance of the equivalent transformer are equal to the parallel conductance and susceptance of the operation transformers in the group.
Step 4) in the attached drawing describes that equivalent result information of the wind power plant is output, and the equivalent result of the wind power plant is output to the online safety analysis application function module for use according to a specified format.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (4)
1. A large wind power plant equivalence method for online safety analysis based on in-station topology comprises the following steps:
1) the method comprises the following steps of acquiring data information of each wind power plant from an external system, wherein the data information specifically comprises the following information:
real-time information of the wind turbine generator: the method comprises the steps of generating active power, reactive power, a switching state, wind speed and pitch angle of a wind turbine generator;
static model parameters of the wind turbine generator: the method comprises the following steps of (1) including wind turbine generator type, generator rated power, upper and lower active and reactive limits, upper and lower pitch angle limits, wind turbine generator stability parameters, and topological connection relation information of the wind turbine generator and a feeder line and topological connection relation information of the wind turbine generator and a generator-end transformer;
protection parameters of the wind turbine generator: the method comprises high/low frequency protection fixed value and time limit, and high/low voltage protection fixed value and time limit;
parameters of the wind turbine generator-end transformer: the transformer comprises a transformer type, high-low voltage winding resistance, reactance, conductance, susceptance and high-low voltage side voltage levels;
on the basis of obtaining the information, according to the reasonable range of the equipment parameters and by combining with the judgment of an expert system, carrying out rationality check on the obtained data and correcting errors and suspicious data in the data;
2) according to the information obtained in the step, wind turbines of the wind power plant are grouped according to the topological connection relation between the wind turbines and the feeder lines, and the wind turbines in the wind power plant are divided into a plurality of groups; dividing the transformer at the generator end into a plurality of groups according to the topological connection relation between the transformer at the generator end and the feeder line; on the basis, the wind turbine generators in each group are grouped according to the switching-off state, the type of the wind turbine generator, the rated active power, the stable parameter, the protection constant value, the active power and the pitch angle in sequence to obtain grouping information comprising the grouping condition of the wind turbine generators in the wind turbine, the grouping condition in the group and the grouping condition of the group in the group, and the step 3 is carried out;
3) according to the grouping result, equating the wind turbine generator in each group to be an equivalent machine, and solving the equivalent power, the rated power, the equivalent wind speed of each equivalent machine and the impedance, the admittance and the rated capacity of each equivalent transformer; equating the transformer at the generator end in each group to be an equivalent transformer, solving the rated capacity, impedance and admittance of each equivalent transformer, and entering the step 4);
4) and outputting equivalent result information of the wind power plant, and providing the equivalent result of the wind power plant for online safety analysis.
2. The large wind farm equivalence method for online safety analysis based on the in-station topology according to claim 1, characterized in that the step 2) specifically comprises the following steps:
2-1) grouping the wind turbine generators in the wind power plant according to the topological connection relationship between the wind turbine generators and the feeder lines, and dividing the wind turbine generators connected to the same feeder line into the same group;
2-2) grouping generator-side transformers in the wind power plant according to the topological connection relation with the feeder lines, and dividing the generator-side transformers connected to the same feeder line into the same group;
2-3) grouping the wind turbine generators in each group according to the switching-on and switching-off states, wherein the started wind turbine generators are divided into the same group, and the stopped wind turbine generators are divided into another group;
2-4) grouping the wind turbine generators in each group according to the types of the wind turbine generators, wherein the wind turbine generators are divided into the same group in the same type, and the types of the wind turbine generators comprise constant speed, double feed and direct drive;
2-5) further grouping according to the rated active power of each wind turbine, wherein the wind turbines with the same or similar rated active power are divided into the same group;
2-6) further grouping according to the stable parameters of the wind turbine generator, wherein the stable parameters are divided into the same group;
2-7) further grouping according to the protection constant value of the wind turbine generator, and dividing the protection constant value into the same group;
2-8) aiming at the grouping with the type of double-fed or direct-driven, further dividing the wind turbine generators in the group into the following 3 groups according to the active power of the wind turbine generators:
active power greater than 0 and less than Pset
Active power of P or moresetAnd less than 1.0pu
Active power equal to 1.0pu
Wherein P issetPresetting a threshold value of active power by a per unit system according to the actual engineeringSetting an actual requirement;
2-9) for the grouping with the type of double-fed or direct-driven and the active power equal to 1pu, further dividing the units in the group into the following 3 groups according to the pitch angle:
the pitch angle is equal to the rated lower limit βmin
the pitch angle is equal to the upper limit of the nominal value betamax
the pitch angle is greater than the rated lower limit βminless than the rated upper limit betamax
In the grouping process of steps 2-5), 2-6), 2-7), 2-8) and 2-9), if the number of groups in the group is more than N after groupingmaxIf yes, the step of grouping is abandoned, and the grouping is directly finished; otherwise, the step of grouping is accepted, and the next step is carried out; n is a radical ofmaxAnd setting the maximum grouping number according to the actual engineering requirements.
3. The large wind farm equivalence method for online safety analysis based on the in-station topology according to claim 2, characterized in that in the step 2), rated active power of each wind turbine is judged to be close within ± 5%.
4. The large wind farm equivalence method for online safety analysis based on the in-station topology according to claim 2, wherein the method for equating the wind turbines in each group into an equivalence machine in the step 3) is as follows:
the rated active power of the equivalent machine is equal to the sum of the rated active power of each wind turbine generator set in the group;
the upper limit of active power of the equivalent machine is equal to the sum of rated active power of each wind turbine generator set in the group;
the lower limit of the active power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the active power of the equivalent machinePMin；
The active power of the equivalent machine is equal to the sum of the active power of each wind turbine generator in the group;
the reactive power of the equivalent machine is equal to the sum of the reactive power of all the wind turbine generators in the group;
the number of the wind turbine generators of the equivalent machine is equal to the total number of the wind turbine generators in the group;
the upper limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the upper limit coefficient K of the reactive power of the equivalent machineQMax；
The lower limit of the reactive power of the equivalent machine is equal to the rated active power multiplied by the lower limit coefficient K of the reactive power of the equivalent machineQMin；
The rated capacity of the single machine is equal to the rated capacity of the equivalent machine divided by the number of the wind turbine generators of the equivalent machine;
on the basis of grouping the transformers at the generator end in the step 2-2), equating the transformers at the generator end in the group into one equivalent transformer:
the rated capacity of the equivalent transformer is equal to the sum of the rated capacities of the operating transformers in the group;
the resistance and reactance of the equivalent transformer are equal to the parallel resistance and reactance of the operating transformers in the group;
the conductance and susceptance of the equivalent transformer are equal to the parallel conductance and susceptance of the operation transformers in the group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611137228.0A CN107069702B (en) | 2016-12-12 | 2016-12-12 | Large wind power plant equivalence method for online safety analysis based on in-station topology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN102255307A (en) * | 2011-06-09 | 2011-11-23 | 重庆大学 | Layering equivalence method for reliability estimation of distribution network |
| CA2733281C (en) * | 2008-08-23 | 2014-04-22 | Dewind Co. | Method for regulating a wind park |
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| CA2733281C (en) * | 2008-08-23 | 2014-04-22 | Dewind Co. | Method for regulating a wind park |
| CN101882167A (en) * | 2009-11-25 | 2010-11-10 | 中国电力科学研究院 | Wind power station equivalent modeling method of large-scale wind power concentration access power grid |
| CN102255307A (en) * | 2011-06-09 | 2011-11-23 | 重庆大学 | Layering equivalence method for reliability estimation of distribution network |
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