CN110601209B - Method and device for suppressing low-frequency oscillation of voltage of wind power plant - Google Patents
Method and device for suppressing low-frequency oscillation of voltage of wind power plant Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention provides a method and a device for suppressing low-frequency oscillation of voltage of a wind power plant, wherein the method comprises the following steps: acquiring an output reactive dead zone value of each static var generator; obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator; obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator; and outputting the optimal target reactive power value of each static var generator to each static var generator. The invention can inhibit the low-frequency oscillation of the voltage of the wind power plant caused by the existence of the minimum reactive dead zone of the static var generator.
Description
Technical Field
The invention relates to the field of new energy power generation, in particular to a method and a device for suppressing low-frequency voltage oscillation of a wind power plant.
Background
Wind power has the characteristics of random fluctuation load characteristics and access to the tail end of a power grid, and the influence on the power quality and the voltage stability of a power system is increasingly prominent. SVG (Static Var Generator) is widely used in wind farms as an important measure for improving the quality of electric energy in wind farms and improving the operation stability of power systems. At present, reactive devices such as SVG, wind turbine generator, capacitor and the like in a wind power plant are generally subjected to unified coordination Control by an AVC (Automatic Voltage Control) system of the wind power plant so as to ensure the Voltage stability of a grid-connected point of the wind power plant.
In the prior art, more researches are carried out on aspects of SVG control strategy optimization, influence of SVG on system voltage stability, reactive coordination strategies of SVG and a wind turbine generator and the like, however, in practical application, SVG (especially old SVG) generally sets a minimum output reactive dead zone, and if the influence of the factor is not considered in wind farm AVC strategy, the step change of reactive power sum output by multiple SVG can be caused up and down at the zero point, so that voltage low-frequency oscillation occurs.
FIG. 1 is a graph of wind farm voltage value over time for a voltage low frequency oscillation phenomenon occurring during operation of a certain actually operating wind farm, wherein UtargetIs a target voltage value, U, of a wind farm busactualFor the current voltage value of the bus of the wind farm, fig. 2 is a time-varying graph of the reactive power output by the plurality of SVGs corresponding to fig. 1, and it can be seen that when the total of the reactive power output by the plurality of SVGs changes in step around the zero point (t in the graph)1To t2Within the time length), because SVG has the minimum reactive dead zone, and the influence of the SVG minimum reactive dead zone is not considered in the AVC strategy, the reactive power sum output by a plurality of SVG is changed in steps between the inductive minimum output reactive power and the capacitive minimum output reactive power, and at the moment, the current voltage value U of the bus of the wind power plant is changed in stepsactualAnd the situation of repeated regulation occurs beyond the AVC regulation dead zone, so that the voltage of the wind power plant oscillates at low frequency, and the voltage oscillation period of the wind power plant is twice of the AVC regulation period.
Disclosure of Invention
The embodiment of the invention provides a method for suppressing low-frequency voltage oscillation of a wind power plant, which is used for suppressing the low-frequency voltage oscillation of the wind power plant caused by the existence of a minimum reactive power dead zone of a static var generator and comprises the following steps:
acquiring an output reactive dead zone value of each static var generator;
obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator;
obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator;
and outputting the optimal target reactive power value of each static var generator to each static var generator.
The embodiment of the invention provides a wind power plant voltage low-frequency oscillation suppression device, which is used for suppressing wind power plant voltage low-frequency oscillation caused by the existence of a minimum reactive power dead zone of a static var generator and comprises the following components:
the output reactive dead zone value acquisition module is used for acquiring the output reactive dead zone value of each static reactive generator;
the first calculation module is used for obtaining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator;
the second calculation module is used for obtaining the optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator;
and the output module is used for outputting the optimal target reactive power value of each static var generator to each static var generator.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor realizes the wind power plant low-frequency oscillation suppression method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the wind farm low-frequency oscillation suppression method is stored in the computer-readable storage medium.
In the embodiment of the invention, the output reactive dead zone value of each static var generator is obtained; obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator; obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator; and outputting the optimal target reactive power value of each static var generator to each static var generator. According to the embodiment of the invention, aiming at the low-frequency oscillation of the voltage of the wind power plant caused by the output reactive dead zone of the static var generator, the optimal target reactive value of each static var generator is obtained, and the optimal target reactive value is output to each static var generator, so that the low-frequency oscillation of the voltage of the wind power plant can be inhibited.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a graph of wind farm voltage value over time when a voltage low frequency oscillation phenomenon occurs in the operation process of a certain actually-operated wind farm;
fig. 2 is a graph of the reactive power output by a plurality of static var generators corresponding to fig. 1 with time;
FIG. 3 is a flow chart of a method for suppressing low-frequency oscillation of voltage of a wind power plant in the embodiment of the invention;
FIG. 4 is a graph of voltage over time for an actual wind farm prior to employing the method of an embodiment of the present invention;
FIG. 5 is a graph of the sum of the reactive power output by 3 SVDs corresponding to FIG. 4 over time;
fig. 6 is a reactive power value of each of the static var generators corresponding to fig. 4;
FIG. 7 is a graph of AVC voltage over time after the method of an embodiment of the present invention is employed in the presence of low frequency oscillations in the voltage;
FIG. 8 is a graph of the sum of the reactive power output by the 3 SVDs corresponding to FIG. 7 over time;
fig. 9 is a reactive power value of each of the static var generators corresponding to fig. 7;
fig. 10 is a schematic structural diagram of a wind farm voltage low-frequency oscillation suppression device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 3 is a flowchart of a method for suppressing low-frequency oscillation of voltage of a wind farm in an embodiment of the present invention, and as shown in fig. 3, the method includes:
301, acquiring an output reactive dead zone value of each static var generator;
and step 304, outputting the optimal target reactive power value of each static var generator to each static var generator.
As can be seen from fig. 3, in the embodiment of the present invention, the output reactive dead zone value of each static var generator is obtained; obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator; obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator; and outputting the optimal target reactive power value of each static var generator to each static var generator. According to the embodiment of the invention, aiming at the low-frequency oscillation of the voltage of the wind power plant caused by the output reactive dead zone of the static var generator, the optimal target reactive value of each static var generator is obtained, and the optimal target reactive value is output to each static var generator, so that the low-frequency oscillation of the voltage of the wind power plant can be inhibited.
In specific implementation, the output reactive dead zone value of each static var generator needs to be obtained first.
In one embodiment, obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator includes:
according to the output reactive dead zone value of each static var generator, obtaining a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
obtaining a target total reactive power value of a plurality of static reactive power generators according to a current voltage value and a target voltage value of a bus of a wind power plant and a current output reactive power value of the wind power plant;
and according to the target total reactive power values of the plurality of static var generators, determining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm.
In an embodiment, obtaining the target total reactive power value of the plurality of static var generators according to the current voltage value and the target voltage value of the wind farm bus, and the current output reactive power value of the wind farm may include:
obtaining a target output reactive power value of the wind power plant according to the current voltage value and the target voltage value of the bus of the wind power plant and the current output reactive power value of the wind power plant;
obtaining target output reactive power of the wind turbine generator set according to a target output reactive power value of the wind power plant and a set reactive power value distribution mode;
and obtaining the target total reactive power value of the plurality of static reactive power generators according to the target output reactive power value of the wind power plant and the target output reactive power of the wind power generation set.
In one embodiment, the following preset algorithm is adopted to obtain a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator:
wherein Q is1,Q2,…,Qn+1A 1 st, 2 nd, … th, n +1 st value which is the sum of the output reactive dead zone values of the plurality of static var generators;
Q1d,Q2d,…,Qndoutput reactive dead zone values of 1 st, 2 nd, … th static var generators, and Q1d≤Q2d≤…≤Qnd。
In specific implementation, the automatic voltage control system (AVC) obtains a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator according to the algorithm in the formula (1).
In an embodiment, a target output reactive power value of a wind farm can be obtained by an automatic voltage control system (AVC) according to a current voltage value and a target voltage value of a bus of the wind farm and a current output reactive power value of the wind farm by using the following formula:
wherein Q istargetOutputting a reactive value for a target of the wind power plant;
Qactualis windThe current output reactive value of the electric field;
Uactualthe current voltage value of the bus of the wind power plant is obtained;
Utargetthe target voltage value is a wind power plant bus;
x is the system impedance;
an automatic voltage control system (AVC) distributes the target output reactive power value of the wind power plant to the wind generation set and the plurality of static var generators according to the set distribution mode, wherein the target output reactive power distributed to the wind generation set is QWT。
The automatic voltage control system (AVC) can obtain the target total reactive power values of a plurality of static reactive power generators according to the target output reactive power value of the wind power plant and the target output reactive power of the wind power generation set by adopting the following formula:
Qsvg＝Qtarget-QWT (3)
wherein Q issvgThe target total reactive power value of the plurality of static reactive power generators is obtained;
QWTthe method is characterized in that the target output reactive power of the wind turbine generator is obtained according to the target output reactive power value of the wind power plant and the set reactive power value distribution mode.
In one embodiment, if the target total reactive power values of the plurality of static var generators satisfy the following formula, according to the target total reactive power values of the plurality of static var generators, determining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm:
wherein Q isiThe optimal value of the sum of the output reactive dead zone values of the plurality of static var generators is obtained;
Qsvgthe target total reactive power value of the plurality of static reactive power generators is obtained;
and n is the number of the static var generators.
In an embodiment, obtaining the optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator includes:
according to the optimal value Q of the sum of the output reactive dead zone values of a plurality of static var generatorsiSerial number i of and output reactive dead zone value Q of ith station static var generatoridDetermining the optimal target reactive power value of the ith static var generator as Qid；
According to the output reactive dead zone value Q of the 1 st to i-1 st static var generators1d,Q2d,…,Q(i-1)dDetermining the optimal target reactive power value of the 1 st to the i-1 st static var generators as-Q1d,-Q2d,…,-Q(i-1)d；
According to the output reactive dead zone value Q of the (i + 1) th to the nth static var generators(i+1)d,…,QndDetermining the optimal target reactive power value of the (i + 1) th to the nth static var generators as Q(i+1)d,…,Qnd。
A specific embodiment is given below to illustrate a specific application of the method for suppressing low-frequency oscillation of voltage of a wind farm provided by the embodiment of the invention.
Fig. 4 is a graph of voltage change with time of an actual wind farm before the method according to the embodiment of the present invention is adopted, fig. 5 is a graph of total reactive power output by 3 static var generators corresponding to fig. 4, fig. 6 is a graph of reactive power value of each static var generator corresponding to fig. 4, as shown in fig. 4-6, AVC voltage dead zone is an interval formed by a lower limit voltage and an upper limit voltage, when the actual voltage of AVC is stepped from 112kV to 113.15kV, the calculated reactive power of the 3 static var generators is 0.38Mvar, the calculated reactive power of each static var generator is 0.127Mvar, but the reactive power of each static var generator cannot reach 0.127Mvar due to the existence of the minimum reactive dead zone of the static var generator, as can be seen from fig. 5, the total reactive power of the 3 static var generators varies from-1.8 Mvar to 1.8Mvar, the output reactive power of the 3 static var generators is simultaneously subjected to step change between inductive minimum reactive power (-0.6Mvar) and capacitive minimum reactive power (0.6Mvar), so that the actual voltage of AVC always exceeds an AVC voltage dead zone, and the voltage of a grid-connected point of a wind power plant generates low-frequency oscillation.
Then, the wind power plant voltage low-frequency oscillation suppression method provided by the embodiment of the invention is adopted to calculate the optimal target reactive power value of each static var generator.
Firstly, the output reactive dead zone value of each static var generator is obtained and is 0.6 Mvar.
The method comprises the following steps of adopting a preset algorithm, and obtaining a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to the preset algorithm according to the output reactive dead zone value of each static var generator:
wherein Q is1,Q2,Q3, Q 41,2,3,4 values of the sum of the output reactive dead zone values of the 3 static var generators;
Q1d,Q2d,Q3doutput reactive dead zone values of 1 st, 2 nd and 3 th static var generators, and Q1d＝Q2d＝Q3d＝0.6Mvar。
Obtaining a target total reactive power value Q of 3 static var generators by adopting formulas (2) and (3)svg＝0.38Mvar。
According to the formula (4), from 4 values of the sum of the output reactive dead zone values of the 3 static var generators, the optimal value of the sum of the output reactive dead zone values of the 3 static var generators is determined to be Q2＝0.6Mvar。
Then, an optimal value Q is obtained according to the sum of the output reactive dead zone values of the 3 static var generators2Sequence number 2 of the 2 nd station static var generator, and determining the optimal target reactive value of the 2 nd station static var generator as Q2d＝0.6Mvar；
According to the output reactive dead zone value Q of the 1 st static var generator1dDetermining the 1 st station to the first stationThe optimal target reactive power value of the i-1 static var generators is-Q1d＝-0.6Mvar；
According to the output reactive dead zone value Q of the 3 rd static var generator3dDetermining the optimal target reactive power value of the 3 rd static var generator as Q3d＝0.6Mvar。
And outputting the optimal target reactive power value of the 3 static var generators to the 3 SVGs.
Fig. 7 is a graph showing how the AVC voltage changes with time after the method according to the embodiment of the present invention is applied when the voltage oscillates with low frequency, fig. 8 is a graph showing how the total sum of the reactive power output by the 3 static var generators corresponding to fig. 7 changes with time, and fig. 9 is a graph showing how the reactive power value of each static var generator corresponding to fig. 7, as shown in fig. 7 to 9, after the method according to the embodiment of the present invention is applied, the actual voltage of AVC is 113.24kV, which is close to the target voltage, and the voltage oscillation phenomenon disappears when the actual voltage is within the AVC voltage dead zone. The total reactive power output by the 3 static var generators is 0.6Mvar, and the final reactive power values of the 3 static var generators are respectively-0.6 Mvar, 0.6Mvar and 0.6 Mvar.
In the method for suppressing the voltage low-frequency oscillation of the wind power plant provided by the embodiment of the invention, the output reactive dead zone value of each static var generator is obtained; obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator; obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator; and outputting the optimal target reactive power value of each static var generator to each static var generator. According to the embodiment of the invention, aiming at the low-frequency oscillation of the voltage of the wind power plant caused by the output reactive dead zone of the static var generator, the optimal target reactive value of each static var generator is obtained, and the optimal target reactive value is output to each static var generator, so that the low-frequency oscillation of the voltage of the wind power plant can be inhibited.
Based on the same inventive concept, the embodiment of the invention also provides a wind power plant voltage low-frequency oscillation suppression device, which is implemented as follows. Because the principle of solving the problems is similar to the method for suppressing the low-frequency oscillation of the voltage of the wind power plant, the implementation of the device can refer to the implementation of the method, and repeated parts are not described in detail.
Fig. 10 is a schematic structural diagram of a wind farm voltage low-frequency oscillation suppression device according to an embodiment of the present invention, and as shown in fig. 10, the device includes:
an output reactive dead zone value obtaining module 1001 configured to obtain an output reactive dead zone value of each static var generator;
the first calculation module 1002 is configured to obtain an optimal value of a sum of output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator;
the second calculation module 1003 is configured to obtain an optimal target reactive power value of each static var generator according to an optimal value of a sum of output reactive dead zone values of the plurality of static var generators and an output reactive dead zone value of each static var generator;
the output module 1004 is configured to output the optimal target reactive power value of each static var generator to each static var generator.
In an embodiment, the first calculating module 1002 may specifically be configured to:
according to the output reactive dead zone value of each static var generator, obtaining a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
obtaining a target total reactive power value of a plurality of static reactive power generators according to a current voltage value and a target voltage value of a bus of a wind power plant and a current output reactive power value of the wind power plant;
and according to the target total reactive power values of the plurality of static var generators, determining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm.
In an embodiment, the first calculation module 1002 is further configured to:
obtaining a target output reactive power value of the wind power plant according to the current voltage value and the target voltage value of the bus of the wind power plant and the current output reactive power value of the wind power plant;
obtaining target output reactive power of the wind turbine generator set according to a target output reactive power value of the wind power plant and a set reactive power value distribution mode;
and obtaining the target total reactive power value of the plurality of static reactive power generators according to the target output reactive power value of the wind power plant and the target output reactive power of the wind power generation set.
In summary, in the wind farm voltage low-frequency oscillation suppression device provided in the embodiment of the present invention, the output reactive dead zone value obtaining module is configured to obtain an output reactive dead zone value of each static var generator; the first calculation module is used for obtaining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator; the second calculation module is used for obtaining the optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator; and the output module is used for outputting the optimal target reactive power value of each static var generator to each static var generator. According to the embodiment of the invention, aiming at the low-frequency oscillation of the voltage of the wind power plant caused by the output reactive dead zone of the static var generator, the optimal target reactive value of each static var generator is obtained, and the optimal target reactive value is output to each static var generator, so that the low-frequency oscillation of the voltage of the wind power plant can be inhibited.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for suppressing low-frequency oscillation of voltage of a wind power plant is characterized by comprising the following steps:
acquiring an output reactive dead zone value of each static var generator;
obtaining an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator;
obtaining an optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator;
outputting the optimal target reactive power value of each static reactive power generator to each static reactive power generator;
the method for obtaining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator comprises the following steps:
according to the output reactive dead zone value of each static var generator, obtaining a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
obtaining a target total reactive power value of a plurality of static reactive power generators according to a current voltage value and a target voltage value of a bus of a wind power plant and a current output reactive power value of the wind power plant;
according to the target total reactive power values of the plurality of static var generators, determining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
the preset algorithm is as follows:
wherein Q is1,Q2,…,Qn+1A 1 st, 2 nd, … th, n +1 st value which is the sum of the output reactive dead zone values of the plurality of static var generators;
Q1d,Q2d,…,Qndthe outputs of the 1 st, 2 nd, … th static var generators are nonePower dead zone value, and Q1d≤Q2d≤…≤Qnd。
2. The wind farm voltage low-frequency oscillation suppression method according to claim 1, wherein obtaining the target total reactive power value of the plurality of static var generators according to the current voltage value and the target voltage value of a wind farm bus and the current output reactive power value of the wind farm comprises:
obtaining a target output reactive power value of the wind power plant according to the current voltage value and the target voltage value of the bus of the wind power plant and the current output reactive power value of the wind power plant;
obtaining target output reactive power of the wind turbine generator set according to a target output reactive power value of the wind power plant and a set reactive power value distribution mode;
and obtaining the target total reactive power value of the plurality of static reactive power generators according to the target output reactive power value of the wind power plant and the target output reactive power of the wind power generation set.
3. The wind farm voltage low-frequency oscillation suppression method according to claim 2, characterized in that a target output reactive power value of the wind farm is obtained according to a current voltage value and a target voltage value of a wind farm bus, and a current output reactive power value of the wind farm by adopting the following formula:
wherein Q istargetOutputting a reactive value for a target of the wind power plant;
Qactualoutputting a reactive value for the current wind power plant;
Uactualthe current voltage value of the bus of the wind power plant is obtained;
Utargetthe target voltage value is a wind power plant bus;
x is the system impedance;
obtaining a target total reactive power value of a plurality of static var generators according to a target output reactive power value of the wind power plant and a target output reactive power of a wind power generation set by adopting the following formula:
Qsvg＝Qtarget-QWT
wherein Q issvgThe target total reactive power value of the plurality of static reactive power generators is obtained;
QWTthe method is characterized in that the target output reactive power of the wind turbine generator is obtained according to the target output reactive power value of the wind power plant and the set reactive power value distribution mode.
4. The wind farm voltage low-frequency oscillation suppression method according to claim 1, wherein if the target total reactive power values of the plurality of static var generators satisfy the following formula, an optimal value of the sum of the output reactive dead zone values of the plurality of static var generators is determined from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm according to the target total reactive power values of the plurality of static var generators:
wherein Q isiThe optimal value of the sum of the output reactive dead zone values of the plurality of static var generators is obtained; qi+1The (i + 1) th value, Q, of the sum of the output reactive dead zone values of the plurality of static var generatorsi-1The value is the (i-1) th value of the sum of the output reactive dead zone values of the plurality of static var generators;
Qsvgthe target total reactive power value of the plurality of static reactive power generators is obtained;
and n is the number of the static var generators.
5. The wind farm voltage low-frequency oscillation suppression method according to claim 4, wherein obtaining the optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator comprises:
based on the sum of the output reactive dead band values of a plurality of SVDsOptimum value QiThe serial number i of the I, the output reactive dead zone value Q of the ith static var generatoridDetermining the optimal target reactive power value Q of the ith static var generatorid；
According to the output reactive dead zone value Q of the 1 st to i-1 st static var generators1d,Q2d,…,Q(i-1)dDetermining the optimal target reactive power value of the 1 st to i-1 st static var generators as-Q1d,-Q2d,…,-Q(i-1)d；
According to the output reactive dead zone value Q of the (i + 1) th to the nth static var generators(i+1)d,…,QndDetermining the optimal target reactive power value of the (i + 1) th to the nth static var generators as Q(i+1)d,…,Qnd。
6. A wind power plant voltage low-frequency oscillation suppression device is characterized by comprising:
the output reactive dead zone value acquisition module is used for acquiring the output reactive dead zone value of each static reactive generator;
the first calculation module is used for obtaining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators according to the output reactive dead zone value of each static var generator;
the second calculation module is used for obtaining the optimal target reactive power value of each static var generator according to the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators and the output reactive dead zone value of each static var generator;
the output module is used for outputting the optimal target reactive power value of each static var generator to each static var generator;
the first calculation module is specifically configured to:
according to the output reactive dead zone value of each static var generator, obtaining a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
obtaining a target total reactive power value of a plurality of static reactive power generators according to a current voltage value and a target voltage value of a bus of a wind power plant and a current output reactive power value of the wind power plant;
according to the target total reactive power values of the plurality of static var generators, determining the optimal value of the sum of the output reactive dead zone values of the plurality of static var generators from a plurality of values of the sum of the output reactive dead zone values of the plurality of static var generators obtained according to a preset algorithm;
the preset algorithm is as follows:
wherein Q is1,Q2,…,Qn+1A 1 st, 2 nd, … th, n +1 st value which is the sum of the output reactive dead zone values of the plurality of static var generators;
Q1d,Q2d,…,Qndoutput reactive dead zone values of 1 st, 2 nd, … th static var generators, and Q1d≤Q2d≤…≤Qnd。
7. The wind farm voltage low frequency oscillation suppression device of claim 6, wherein the first calculation module is further configured to:
obtaining a target output reactive power value of the wind power plant according to the current voltage value and the target voltage value of the bus of the wind power plant and the current output reactive power value of the wind power plant;
obtaining target output reactive power of the wind turbine generator set according to a target output reactive power value of the wind power plant and a set reactive power value distribution mode;
and obtaining the target total reactive power value of the plurality of static reactive power generators according to the target output reactive power value of the wind power plant and the target output reactive power of the wind power generation set.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 5 when executing the computer program.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 5.
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