KR101689539B1 - Electronic device and method for determining capacity and the number of transformers of an offshore substations, recording medium for performing the method - Google Patents

Abstract

The present invention relates to an apparatus and a method for determining the number and capacity of a transformer in a marine substation to minimize all the costs consumed in an offshore wind farm, And determining a target function based on the reliability cost; determining at least one number of installable transformers based on the margin of the maritime substation in the offshore wind power generation complex, And a transformer number and capacity determiner for determining the capacity of each transformer based on the total capacity of the offshore wind power plant and the selected number after selecting one number that minimizes the value of the objective function.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus and method for determining the number and capacity of a transformer in a marine substation, and a recording medium for performing the same.

The present invention relates to an apparatus and method for determining the number and capacity of a transformer in a marine substation in order to minimize the total cost consumed in an offshore wind power plant, and more particularly to a method and apparatus for determining the number and capacity of a transformer in a marine substation. .

Because the wind intensity increases as the distance from the coast increases, offshore wind turbines within offshore wind farms are installed several tens of kilometers away from the coast. A marine substation must be installed for the efficient transmission of electrical energy generated offshore wind turbines installed several tens of kilometers away from the shore. At this time, the offshore substation is a facility for converting the characteristics of voltage or current to transmit electricity generated from an offshore wind turbine to a consumer.

Generally, in order to operate a substation, an initial investment cost required for substation installation, operation cost required for substation operation, and a trouble incurred due to a failure of a transformer in a substation are required.

However, the power facilities installed on the sea are higher than those installed on the land, such as initial investment cost, operation cost, and supply failure cost. Therefore, there is a problem that the cost consumed increases exponentially every time a power equipment installed inefficiently is reinstalled or a power facility in which a failure occurs is repaired.

An embodiment of the present invention is to provide an apparatus and method for determining the number and capacity of a transformer of a maritime substation.

Another embodiment of the present invention is to provide an apparatus and method for determining the number and capacity of a transformer for minimizing all the costs consumed in a marine substation.

According to an embodiment of the present invention, an electronic device includes an objective function determination unit for determining an objective function based on an initial investment cost, an operation cost, and a reliability cost for an offshore wind power generation complex, and a margin of a marine substation in the offshore wind power generation complex Determining at least one number of installable transformers based on the number of wind turbines and selecting one number from among the at least one number to minimize the value of the objective function, And a transformer number and capacity determining unit for determining the capacity of each transformer based on the number of transformers.

According to an embodiment of the present invention, a method of an electronic device comprises the steps of: determining an objective function based on an initial investment cost, an operational cost and a reliability cost for an offshore wind farm; Selecting at least one number of the at least one of the at least one number of the wind turbines and the number of the wind turbines at which the value of the objective function is minimized; And determining the capacity of each transformer.

The present invention determines an objective function for determining the overall cost of an offshore wind farm based on the initial investment cost, operating cost and reliability cost required for a offshore wind power generation complex, and calculates a minimum cost By determining the number and capacity of the transformer, the cost consumed in the offshore wind farm can be reduced. Particularly, since the offshore structure is more expensive than onshore structure, it can save a relatively large cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a system of an offshore wind farm according to a preferred embodiment of the present invention;
2 is a view showing a fault occurrence situation of a transformer in a marine substation according to a preferred embodiment of the present invention,
3 is a block diagram of a controller in a maritime substation according to a preferred embodiment of the present invention.
4 is a diagram showing a probability distribution of wind speed and output characteristics of a wind turbine according to a preferred embodiment of the present invention,
FIG. 5 is a graph showing a probability density for the total output of a offshore wind farm according to a preferred embodiment of the present invention,
6 is a diagram illustrating a procedure for determining the number and capacity of a transformer to minimize all the expenditure in a marine substation according to a preferred embodiment of the present invention;

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

In this document, the expressions " having, " " having, " " comprising, " or &Quot;, and does not exclude the presence of additional features.

In this document, the expressions "A or B," "at least one of A or / and B," or "one or more of A and / or B," etc. may include all possible combinations of the listed items . For example, "A or B," "at least one of A and B," or "at least one of A or B" includes (1) at least one A, (2) Or (3) at least one A and at least one B all together.

1 shows a system of an offshore wind farm according to a preferred embodiment of the present invention.

1, an offshore wind power plant 100 includes an offshore wind turbine 101, a marine substation 103, a transmission cable 105, and a common point of connection (PCC) 107.

The offshore wind turbine 101 refers to a rotating mechanism that converts wind energy, which is kinetic energy of the wind, into power, which is mechanical energy. The offshore wind farm 100 according to an embodiment of the present invention may include at least one offshore wind turbine 101 and may include a plurality of offshore wind turbines 101 ). The offshore wind turbine 101 can convert the wind energy, which is the kinetic energy of the wind, into the mechanical energy, and then transmit the converted power to the offshore substation 103.

The maritime substation 103 means a facility including an apparatus for transmitting the power received from the offshore wind turbine 101 to the common connection point 107 via the transmission cable 105. [ The offshore substation 103 may convert the voltage and current so that the power loss generated while the power received from the offshore wind turbine 101 is transmitted to the common connection point 107 is minimized. The marine substation 103 according to the embodiment of the present invention may include at least one transformer having a capacity for minimizing all the expenditure in the marine substation 103. [ For example, the offshore substation 103 may include one transformer with a capacity of 100% in order to minimize all the expenditure in the offshore substation 103. [ As another example, the maritime substation 103 may include two transformers with a capacity of 50% in order to minimize all the costs consumed in the marine substation 103.

The common connection point 107 is a network point for supplying power to at least one power consumer, and can transmit the power received from the maritime substation to the power consumer through the transmission cable 105.

FIG. 2 illustrates a fault occurrence situation of a transformer in a marine substation according to a preferred embodiment of the present invention.

2, a transformer 200 in a marine substation includes two coils (a first coil 201 and a second coil 203). If one coil of the two coils included in the transformer 200 can not be used due to a failure, the transformer 200 in the transformer 200 transmits current only through the coils other than the unusable coil due to the failure So that the transferable capacity of the transformer can be reduced. For example, if the second coil 203 of the first coil 201 and the second coil 203 included in the transformer 200 can not be used due to a failure, the transformer 200 in the off- Since the current can be transmitted only through the first coil 201 and the second coil 203, the total transmission capacity can be reduced as compared with the case where current is transmitted through the first coil 201 and the second coil 203. [

Hereinafter, a method for determining the optimal number and optimum capacity of a transformer in a marine substation considering the influence of a transformer failure and the initial investment cost for installation of a marine substation will be described.

3 shows a block diagram of a controller in a maritime substation according to a preferred embodiment of the present invention.

3, the controller 300 in the marine substation includes an initial investment cost determination unit 301, an operation cost determination unit 303, a reliability cost determination unit 305, an objective function determination unit 307, And a capacity determining unit 309. [

The initial investment cost determination unit 301 can determine the initial investment cost based on the transformer equipment and installation cost, the cost of the peripheral equipment, and the cost of the marine substation structure (platform). A specific method for determining the initial investment cost will be described later in detail with reference to FIG.

The operating cost determining unit 303 can determine the operating cost based on the loss cost of the transformer and the maintenance cost. At this time, the maintenance cost may include the repair cost and the inspection cost due to the breakdown of the transformer. A specific method for determining the operating cost will be described in detail in FIG. 6 below.

The reliability cost determining unit 305 can determine the reliability cost based on the loss cost due to the transformer failure of the marine substation and the supply failure energy cost that can not be transmitted during the transformer replacement period. A specific method for determining the reliability cost will be described later in detail with reference to FIG.

Based on the initial investment cost determined by the initial investment cost determination unit 301, the operating cost determined by the operating cost determination unit 303, and the reliability cost determined by the reliability cost determination unit 305, the objective function determination unit 307 determines The objective function for determining the overall cost of the power generation complex can be determined. A method for determining the objective function will also be described in detail with reference to FIG.

The transformer number and capacity determining unit 309 determines at least one number of installable transformers considering redundancy preset in the substation and calculates the number of calculated minimum costs at the time of substituting the objective function among the determined numbers It can be determined by the number of optimal transformers.

Furthermore, the transformer number and capacity determining unit 309 can determine the capacity of each transformer based on the total capacity of the offshore wind farm. At this time, the transformer number and capacity determining unit 309 can determine that the sum of the respective transformer capacities is equal to the total capacity of the offshore wind farm.

The controller 300 may be provided in the maritime substation or may be provided as a separate device in a region other than the maritime substation depending on the design method.

FIG. 4 shows a probability distribution of wind speed and output characteristics of a wind turbine according to a preferred embodiment of the present invention.

Referring to FIG. 4, the probability distribution of the wind speed in the offshore wind farm complex and the output characteristics of the wind turbine in offshore wind farm can be represented as shown in the graph.

Generally, the magnitude of the output at the offshore wind farm is not constant, and the magnitude of the output can be determined by the wind speed. In other words. The output of the offshore wind farm can be determined according to the wind speed, and the distribution of the total output of the offshore wind farm can be determined according to the distribution of the wind speed. Therefore, a probability distribution with respect to the wind speed should be determined, and a probability distribution with respect to the wind speed can be expressed by the following Equation 1 using a Weibull distribution function.

In this case, Prob (v) means the probability of the wind speed v, k means the dimensionless shape parameter of distribution, and A means the scale parameter.

Offshore wind turbines can exhibit different output characteristics depending on the range of wind speed. The output characteristic according to the range of the wind speed can be expressed by the following equation (2).

은 전송 효율(Transmission efficiency)을 의미하며,

는 발전기 효율을 의미한다. 더하여, V_c는 시동 풍속(Cut in wind speed)(m/s)을 의미하고, V_f는 종단 풍속(Cut out wind speed)(m/s)을 의미하며, V_r은 정격 풍속(rated wind speed)(m/s)을 의미한다. 여기서, 시동 풍속이란 풍력 터빈이 발전을 개시할때의 풍속을 의미한다. 종단 풍속이란 풍력 터빈이 과부하되지 않도록 하기 위해, 발전을 정지해야하는 시점의 풍속을 의미한다. 또한, 정격 풍속이란 풍력 모터에 설계 동력을 발생시킬 수 있는 최소 풍력을 의미한다.In this case, P _WT (v) denotes the output (MW) at the wind speed v, ρ denotes the air density (kg / m ³ ), A _s denotes the blade sweep area m ² ), and C _P means the coefficient of performance of the wind turbine. Also,

Means a transmission efficiency,

Means the generator efficiency. In addition, V _c means cut in wind speed (m / s), V _f means cut out wind speed (m / s), V _r means rated wind speed speed (m / s). Here, the starting wind speed means the wind speed at which the wind turbine starts generating power. The term wind velocity refers to the wind speed at which power generation should be stopped in order to prevent the wind turbine from being overloaded. In addition, the rated wind speed means the minimum wind power that can generate the design power for the wind power motor.

As shown in FIG. 4, when the wind turbine is influenced by the wind speed below the starting wind speed or by the wind speed above the terminal wind speed, the output of the wind turbine becomes zero, and the wind speed of not less than the rated wind speed, If affected, the wind turbine can generate a rated output. If all wind turbines in an offshore wind farm are affected by the same wind speed, the total output of the offshore wind farm can be determined by multiplying the total output of the wind turbine by the total number of wind turbines.

The probability density of the total output of the offshore wind power plant considering this can be represented as shown in FIG.

As shown in Fig. 5, when the output of the offshore wind farm is discrete, the output of the offshore wind farm is 0 and the rated output. For example, if the wind speed is below the cut-in wind speed or above the cut-out wind speed, no output occurs (output = 0) and the wind speed is between the rated wind speed and the terminal wind speed If it is included in the range, rated output may occur. The probability of the above two cases may be relatively high. At this time, the continuous probability existing between the two probabilities represents the output of the offshore wind farm occurring between the starting wind speed and the rated wind speed. In particular, in the range between the two probabilities, the output of the offshore wind farm can be determined depending on the output characteristics of the wind turbine. Based on this characteristic, the average output power of the wind power generator complex can be determined using Equation (3) below.

In this case, P _avg denotes the average output (MW) of the wind power generation complex, and P _WT denotes the rated capacity (MW) of the wind power generation complex. Also, x means the output (MW) of the wind turbine and f _p (x) means the probability of the output x.

FIG. 6 shows a procedure for determining the number and capacity of a transformer to minimize all the expenditure in a maritime substation according to a preferred embodiment of the present invention.

Referring to FIG. 6, in step 601, the controller may determine an initial investment cost. In this case, the initial investment cost refers to the cost of the offshore wind power plant's offshore substation configuration, and may include at least one of the transformer facility and installation cost, the peripheral equipment cost, and the offshore substructure (platform) cost.

The initial investment cost C _inv in accordance with the embodiment of the present invention can be determined using Equation (4) below.

At this time, α _N represents the adjustment ratio for a plurality of transformer installations. For example, if two transformers are installed, the rate of adjustment may be 130%. For another example, if three transformers are installed, the adjustment rate may be 160%. The number of transformers and the adjustment ratio according to the embodiment of the present invention are not limited to the above-described examples, and may be matched differently. Cost _TR represents the cost of the transformer installation, and Cost _OP represents the cost of the structure within the marine substation.

The cost _TR of the transformer according to the embodiment of the present invention can be determined using Equation (5) below.

At this time, A _t means an offset constant value of -1.5244 × 10 ⁸ , and B _t means a slop constant value of 2.7043 × 10 ⁵ . Also, α means 0.4473 as an exponent value, and S _rated means the total rated capacity (VA) of the transformer.

The transformer installation and peripheral equipment cost according to an embodiment of the present invention can be determined to be 50% of the transformer equipment cost calculated by the above equation.

The cost substructure cost (Cost _OP ) according to the embodiment of the present invention can be determined using Equation (6) below.

At this time, A _P means an offset constant value of 2.5238 × 10 ⁹ , and B _P means a slop constant value of 88.333.

Thereafter, the controller may proceed to step 603 to determine the operating cost. At this time, the operating cost may include at least one of the loss cost of the transformer and the maintenance cost, and the maintenance cost may include at least one of the repair cost and the inspection cost due to the transformer failure.

The cost _operation according to the embodiment of the present invention can be determined as shown in Equation (7) below.

In this case, C _loss means the cost of transformer loss, and C _{r / m} means maintenance cost. The cost loss ratio (Cost _TR ) of the transformer according to the embodiment of the present invention means a loss generated when the power produced by the wind turbine passes through the transformer, and can be determined using Equation (8) below.

In this case, C _e means the selling unit price of electric power, and N means the number of transformers. In addition, S _n means the transformer rated capacity and S _in means the transformer input power. In addition, P ₀ denotes the no-load loss parameter (pu), P ₁ denotes the load loss parameter (pu), and P ₀ and P ₁ can be determined according to the following equations (9) and (10).

The maintenance cost Cost _{r / m} according to the embodiment of the present invention includes the repair cost and the inspection cost due to the failure of the transformer, and can be determined using Equation (11) below.

In this case, C _repair refers to the expected repair cost (100 million won / year) in case of failure of one transformer, C _mt means the yearly inspection cost (100 million won / .

Thereafter, the controller may proceed to step 605 to determine the reliability cost. At this time, the reliability cost may include at least one of the repair cost due to the transformer failure of the marine substation, the loss cost due to the failure of the transformer, and the supply failure energy cost that can not be transmitted during the transformer replacement period. For example, in the event of a transformer failure, the transformer capacity does not reach the transmission capacity, so that even if the wind turbine produces electricity, the generated electricity can not be transferred to the land, resulting in loss of costs due to transformer failure .

The reliability cost (Cost _EENS ) according to the embodiment of the present invention can be determined using Equation (12) below.

In this case, P _unavail means the _{unavailability} probability of the transformer i, and the _{unavailability} probability P _unvail (i) of the transformer can be determined using the following equation (13).

Here, λ _i denotes the failure rate (times / year) of the transformer i, and μ _i denotes the repair rate (times / year) of the transformer i.

Thereafter, the controller proceeds to step 607 and may determine an objective function based on the determined initial investment cost, operating cost, and reliability cost. In particular, the controller can determine the operating cost and the reliability cost based on the point of time when the initial investment cost occurs, considering the lifetime of the offshore wind farm and the discount rate.

The objective function according to the embodiment of the present invention can be determined using Equation (14) below.

In this case, L represents the lifetime (years) of the offshore wind farm and R represents the discount rate (%).

Thereafter, the controller may proceed to step 609 to determine the number and capacity of the transformer based on the determined objective function.

First, the controller proposes at least one number of transformers that can be installed in the substation considering the margin of the substation, and the number of the minimum cost calculated at the time of substituting the objective function among the proposed at least one number can be determined as the optimum number of transformers . For example, considering the margin of the substation, the controller determines the objective function cost when the number of transformers that can be installed in the substation is 1, 2, and 3, and sets the number of transformers to 1, The cost of the objective function when the number of transformers is set to two is determined and the objective function cost when the number of transformers is set to three is determined and then the number of transformers in which the minimum cost is calculated among the three objective function costs determined is set as the optimal number of transformers . For another example, when considering the margin of the substation, the controller determines the cost of the objective function when the number of transformers that can be installed in the substation is 3 and 4, and the number of transformers is set to 3, After determining the objective function cost when it is set to four, the number of transformers in which the minimum cost is calculated from the two determined objective function costs can be determined as the optimum number of transformers.

In addition, the controller can determine the capacity of each transformer based on the total capacity of the offshore wind farm and the number of transformers, and the number of transformers can be determined to be three or less. The controller can be determined by referring to the capacity closest to the standard capacity of the transformer manufacturer or utility when determining the transformer capacity. For example, the controller can determine the number and capacity of transformers as shown in Table 1 below.

case Number of transformers and capacity of each transformer Total capacity of offshore wind farms One 1 transformer, 100% capacity 100% 2 2 transformers, 50% capacity 100% 3 2 transformers, 60% capacity 120% 4 2 transformers, 70% capacity 140% 5 2 transformers, 80% capacity 160% 6 2 transformers, 100% capacity 200% 7 3 transformers, 34% capacity 102% 8 3 transformers, 40% capacity 120% 9 3 transformers, 50% capacity 150%

For example, if the total capacity of an offshore wind farm is 100% and the number of transformers is one, the capacity of the transformer may be 100%. For another example, if the total capacity of the offshore wind farm is 100% and the number of transformers is two, the capacity of each of the two transformers may be 50%. As another example, if the total capacity of the offshore wind farm is 120% and the number of transformers is two, the capacity of each of the two transformers may be 60%. As another example, if the total capacity of an offshore wind farm is 140% and the number of transformers is two, the capacity of each of the two transformers may be 70%. As another example, if the total capacity of an offshore wind farm is 160% and the number of transformers is two, the capacity of each of the two transformers may be 80%. As another example, if the total capacity of an offshore wind farm is 200% and the number of transformers is two, the capacity of each of the two transformers may be 100%. For another example, if the total capacity of the offshore wind farm is 102% and the number of transformers is three, the capacity of each of the three transformers may be 34%. As another example, if the total capacity of an offshore wind farm is 120% and the number of transformers is three, the capacity of each of the three transformers may be 40%. As another example, if the total capacity of an offshore wind farm is 150% and the number of transformers is three, the capacity of each of the three transformers may be 50%.

The techniques described above may be implemented in an application or may be implemented in the form of program instructions that may be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the computer-readable recording medium may be ones that are specially designed and configured for the present invention and are known and available to those skilled in the art of computer software.

Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules for performing the processing according to the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (11)

An objective function determination unit for determining an objective function based on an initial investment cost, an operation cost, and a reliability cost for an offshore wind power plant;
Determining at least one number of installable transformers based on margins of a maritime substation in the offshore wind power generation complex, selecting one number from among the at least one number to minimize the value of the objective function, And a transformer number and capacity determination unit for determining the capacity of each transformer based on the total capacity of the wind power generation complex and the selected number,
Wherein the objective function determination unit comprises:
The operating cost and the reliability cost are determined based on the lifetime and the discount rate of the offshore wind farm based on the time point of the initial investment cost,
Wherein the objective function is defined by the following equation.
<Formula>

L is the lifetime (years) of the offshore wind farm, R is the discount rate (%), C _inv is the initial investment cost, Cost _operation is the operating cost, and Cost _EESN is the reliability cost. The method according to claim 1,
Further comprising an initial investment cost determination section,
The initial investment cost determination unit determines an initial investment cost based on at least one of a cost of a transformer installation, a modification ratio of a plurality of transformer installation, a transformer installation cost, a peripheral facility cost, and a marine substation structure cost,
Wherein the transformer equipment cost is determined based on at least one of a first offset constant, a first slop constant, an exponent, and a total rated capacity of the transformer,
Wherein the marine substation structure cost is determined based on at least one of a second offset constant, a second slope constant, and a total rated capacity of the transformer.
The method according to claim 1,
Further comprising an operating cost determining unit,
The operating cost determining unit determines an operating cost based on at least one of a loss cost of a transformer and a maintenance cost,
Wherein the transformer loss cost is determined based on at least one of a power sale unit price, a transformer number, a transformer rated capacity, a transformer input power, a no-load loss parameter, and a load loss parameter,
Wherein the maintenance cost is based on at least one of a transformer repair cost and a check cost.
The method according to claim 1,
And a reliability cost determining unit,
Wherein the reliability cost determining unit determines a reliability cost based on at least one of a transformer unavailability probability, a power sale unit price, and an average output of an offshore wind farm,
Wherein the average power of the offshore wind farm is determined based on at least one of a rated capacity of the offshore wind farm, an output of the wind turbine, and a probability of the output of the wind turbine,
Wherein the probability of non-use of the transformer is determined based on at least one of a failure rate and a repair rate of the transformer.
delete Determining an objective function based on an initial investment cost, an operating cost, and a reliability cost for an offshore wind farm;
Determining at least one number of installable transformers based on margin of a maritime substation in the offshore wind power plant;
Selecting one number among the at least one number in which the value of the objective function is minimized;
Determining the capacity of each transformer based on the total capacity and the selected number of offshore wind farms,
Wherein the step of determining the objective function comprises:
The operating cost and the reliability cost are determined based on the lifetime and the discount rate of the offshore wind farm based on the time point of the initial investment cost,
Wherein the objective function is defined by the following equation: < EMI ID = 17.1 >
<Formula>

L is the lifetime (years) of the offshore wind farm, R is the discount rate (%), C _inv is the initial investment cost, Cost _operation is the operating cost, and Cost _EESN is the reliability cost. The method according to claim 6,
The initial investment cost is determined based on at least one of the cost of the transformer equipment, the adjustment ratio for installing a plurality of transformers, the cost of transformer installation, the cost of peripheral equipment, and the cost of offshore substructure structure,
The transformer installation cost is determined based on at least one of a first offset constant, a first slope constant, an index, and a total rated capacity of the transformer,
Wherein the cost of the offshore substructure structure is determined based on at least one of a second offset constant, a second slope constant, and a total rated capacity of the transformer.
The method according to claim 6,
The operating cost is determined based on at least one of loss cost of the transformer, maintenance cost,
The transformer loss cost is determined based on at least one of a power sale unit price, a transformer number, a transformer rated capacity, a transformer input power, a no-load loss parameter, and a load loss parameter,
Wherein the maintenance cost is determined based on at least one of a transformer repair cost and a check cost.
The method according to claim 6,
The reliability cost is determined based on at least one of a transformer unavailability probability, a power sale unit price, and an average power of an offshore wind farm,
The average output of the offshore wind farm is determined based on at least one of the rated capacity of the offshore wind farm, the output of the wind turbine, and the probability of the output of the wind turbine,
Wherein the transformer unavailability probability is determined based on at least one of a failure rate and a repair rate of the transformer.
delete A computer-readable recording medium storing a program for causing a computer to execute the method according to any one of claims 6 to 9.

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