Transformer substation interval comprehensive utilization rate calculation method and system considering load characteristics and volatility

Abstract

The invention provides a transformer substation interval comprehensive utilization rate calculation method and system considering load characteristics and volatility, and relates to the technical field of power distribution system planning. The method comprises the following steps: firstly, acquiring operation data and substation line basic parameters of a certain substation, calculating a substation idealized interval utilization rate based on the operation data and the substation line basic parameters of the substation, and correcting the substation idealized interval utilization rate by using load characteristics to obtain a substation practical interval utilization rate; then, calculating a supplementary evaluation index of the practical interval utilization rate of the transformer substation based on load fluctuation, and calculating the comprehensive utilization rate of the transformer substation interval based on the practical interval utilization rate of the transformer substation and the supplementary evaluation index; the interval utilization rate and the interval resource utilization improvement potential of the transformer substation are accurately expressed, and improvement of power supply efficiency and reliability of a power system in a power grid power supply area is promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution system planning, and more specifically, to a method and system for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations. Background Art

[0002] In current power grid construction, the contradiction between distribution network access demand and substation bay resources is becoming increasingly prominent. For example, in response to new energy access demand, large-scale distributed power generation access has significantly increased the frequency of substation 10kV bay usage. The volatility and randomness of its output have placed higher demands on the dynamic allocation of bay resources, and the existing bay configuration model is unable to meet flexible access needs. Regarding user access demand, the shrinking real estate economy and significant changes in supply and demand have resulted in the actual load of newly built residential communities being lower than the registered capacity for a long time, resulting in inefficient use of bay resources. Regarding charging load access, the layout of electric vehicle charging facilities is unbalanced, with low utilization rates of charging piles in some areas. At the same time, the problem of idle assets caused by equipment upgrades exacerbates the waste of bay resources. The above contradictions highlight two problems with substation bay resources: on the one hand, new access demand cannot be met in a timely manner, and on the other hand, existing bay resources are redundant.

[0003] There are several outgoing lines in a substation, and the total number of line bays is large. The existing method for calculating the bay utilization rate of a substation is usually based on a simple ratio of the number of used bays to the total number of bays or a static capacity of the actual load divided by the rated capacity. Although the calculated load connected to each outgoing line of the current substation is low, the bay utilization rate obtained appears to be high. This shows that the traditional substation bay utilization rate indicator cannot truly reflect the actual bay utilization rate, which in turn causes a more serious problem of idle and wasted bay resources.

[0004] In addition, the existing calculation method does not take load fluctuation into account and cannot accurately express the substation bay utilization and bay resource utilization improvement potential. Summary of the Invention

[0005] This application proposes a method and system for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations. On the one hand, it aims to address the problem that the traditional substation interval utilization rate indicator cannot accurately reflect the actual equipment utilization rate, resulting in serious idle waste of interval resources. The practical substation interval utilization rate is calculated considering load characteristics, aiming to reflect the actual use of substation intervals; on the other hand, it aims to accurately express the potential for improving the substation interval utilization rate and interval resource utilization, and promote the improvement of power supply efficiency and reliability of the power system in the power grid supply area.

[0006] In order to achieve the above technical effects, the technical solutions of the present invention are as follows:

[0007] In a first aspect, the present application proposes a method for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations, comprising the following steps:

[0008] S1. Obtain the operating data of a substation and the basic parameters of the substation line;

[0009] S2. Calculate the idealized substation bay utilization based on substation operating data and substation line basic parameters;

[0010] S3. Use load characteristics to correct the idealized substation interval utilization rate to obtain the practical substation interval utilization rate;

[0011] S4. Calculate the supplementary evaluation index of the practical interval utilization rate of substations based on load fluctuation;

[0012] S5. Calculate the comprehensive utilization rate of substation intervals based on the practical utilization rate of substation intervals and supplementary evaluation indicators.

[0013] Preferably, the substation operation data includes: the annual maximum utilization hours and electricity price of the substation, the total number of line intervals of the substation, the total number of public line intervals of the substation and the total number of dedicated line intervals of the substation;

[0014] The basic parameters of the substation line include: annual power supply of each feedback line of the substation, safety current of the trunk line, power factor, power transfer factor, construction cost, interest rate, operating years, annual load power consumption curve, safety load and its average value, annual actual power load and its average value.

[0015] Preferably, the process of calculating the idealized bay utilization of a substation includes:

[0016] Calculate the ideal feeder spacing capacity factor of the substation public line and the substation dedicated line respectively, where the ideal feeder spacing capacity factor of the substation public line is e 1,g,i The calculation expression is:

[0017]

[0018] Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,i is the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, T max is the annual maximum utilization hours of the substation;

[0019] Idealized feeder spacing capacity factor e of dedicated substation lines 1,z,iThe calculation expression is:

[0020]

[0021] Among them, Q i is the economic benefit of the ith dedicated line bay of the substation, A z,i is the annual power supply of the feeder in the i-th dedicated line bay, Q M is the electricity price, M is the feeder construction cost of the i-th dedicated line bay, Q k,i is the capacity usage fee of the ith dedicated line interval, r is the interest rate, n is the feeder operation year of the ith dedicated line interval, T max is the annual maximum utilization hours of the substation, I z,i is the feeder trunk line safety current of the ith dedicated line bay, α z,i is the feeder power factor of the ith dedicated line bay, k z,i is the feeder transfer factor of the i-th dedicated line bay;

[0022] Calculate the idealized feeder spacing capacity factor e of the substation utility line 1,g,i and ideal feeder spacing capacity factor e of dedicated substation lines 1,z,i The weighted average of the idealized interval utilization rate of the substation is taken as the weighted average, and the expression is:

[0023]

[0024] Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

[0025] Preferably, the process of correcting the idealized bay utilization of the substation using load characteristics includes:

[0026] Calculate the practical feeder interval capacity factor e of the substation public line after load characteristics correction 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i , where the practical feeder spacing capacity factor e of the substation utility line is 2,g,i The calculation expression is:

[0027]

[0028] Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,iis the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, η i,t is the feeder power load curve of the ith utility line bay on day t;

[0029] Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The calculation expression is:

[0030]

[0031] Among them, Q i is the economic benefit of the ith dedicated line bay of the substation, A z,i is the annual power supply of the feeder in the i-th dedicated line bay, Q M is the electricity price, M is the feeder construction cost of the i-th dedicated line bay, Q k,i is the capacity usage fee of the ith dedicated line interval, r is the interest rate, n is the feeder operation year of the ith dedicated line interval, I z,i is the feeder trunk line safety current of the ith dedicated line bay, α z,i is the feeder power factor of the ith dedicated line bay, k z,i is the feeder transfer factor of the i-th dedicated line bay, η i,t The load data of the dedicated line interval ranked t in the load data collected every 15 minutes in the power grid is used for the i-th dedicated line interval; the practical feeder interval capacity factor e of the substation public line is calculated. 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The weighted average of the substation interval utilization rate e2 is taken as the weighted average, and the expression is:

[0032]

[0033] Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

[0034] Preferably, the supplementary evaluation index P of the utility interval utilization rate of the substation in step S4 is i The calculation expression is:

[0035]

[0036] in, is the average value of the safety load of the i-th feedback line, P B,i,t is the safe load of the selected feeder at time t, which is a fixed value. is the average value of the actual power load of the i-th feedback line, P L,i,t is the actual power load of the selected feeder at time t.

[0037] Preferably, the process of calculating the comprehensive utilization rate of the transformer substation interval in step S5 includes: calculating the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , the process is:

[0038] The practical interval capacity factor e of the i-th feedback line 2,i and supplementary evaluation index P i The value of is divided into several levels, where each level corresponds to a score interval;

[0039] The practical interval capacity factor e of the i-th feedback line is calculated based on the quadratic function curve using the least squares method. 2,i

[0040] and supplementary evaluation index P i The value of is fitted to the specific score in the score range of the corresponding level, and the practical interval capacity factor e of the i-th feedback line is obtained respectively. 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i .

[0041] Preferably, the process of calculating the comprehensive utilization rate of the transformer substation interval described in step S5 further includes: based on the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , calculate the comprehensive score y of the i-th feedback line i , the expression is:

[0042]

[0043] The comprehensive score y based on the i-th feedback line i , calculate the comprehensive utilization rate of substation interval e3, the expression is:

[0044]

[0045] Where S is the total number of line bays in the substation.

[0046] On the second aspect, the present application also proposes a device for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations, comprising at least one processor and at least one memory connected to the processor, wherein: the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in any one of claims 1 to 7.

[0047] On the third aspect, the present application also proposes a computer-readable storage medium on which a computer program is stored, wherein the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in any one of claims 1 to 7.

[0048] In a fourth aspect, the present application further proposes a comprehensive substation bay utilization calculation system that takes into account load characteristics and fluctuations, the system being used to implement the method described in any one of claims 1 to 7, comprising:

[0049] Substation basic data acquisition module, used to obtain the operating data of a substation and the basic parameters of the substation line;

[0050] An idealized bay utilization calculation module is used to calculate the idealized bay utilization of the substation based on the substation operation data and substation line basic parameters;

[0051] A practical interval utilization calculation module is used to correct the ideal interval utilization of the substation using load characteristics to obtain the practical interval utilization of the substation;

[0052] A supplementary evaluation index calculation module is used to calculate the supplementary evaluation index of the practical interval utilization rate of the substation based on load fluctuation;

[0053] The substation interval comprehensive utilization rate calculation module is used to calculate the substation comprehensive interval utilization rate based on the substation practical interval utilization rate and supplementary evaluation indicators.

[0054] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0055] The present invention proposes a method and system for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations. First, the operating data of a certain substation and the basic parameters of the substation line are obtained. Based on the operating data and the basic parameters of the substation line, the idealized interval utilization rate of the substation is calculated. The idealized interval utilization rate of the substation is corrected using the load characteristics to obtain the practical interval utilization rate of the substation, thereby accurately reflecting the actual use of the substation interval. Then, based on the load fluctuation, a supplementary evaluation index of the practical interval utilization rate of the substation is calculated. Based on the practical interval utilization rate of the substation and the supplementary evaluation index, the comprehensive utilization rate of the substation interval is calculated, which accurately expresses the potential for improving the substation interval utilization rate and interval resource utilization, and promotes the improvement of the power supply efficiency and reliability of the power system in the power grid supply area. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic flow chart showing a method for calculating a substation interval comprehensive utilization rate taking into account load characteristics and fluctuations, according to a first embodiment of the present invention;

[0057] Figure 2 A graph showing the annual power load curve of each feedback line of the selected substation proposed in embodiment 2 of the present invention;

[0058] Figure 3 A graph showing the actual annual power load of each feedback line of the selected substation proposed in embodiment 2 of the present invention;

[0059] Figure 4 A structural diagram showing a device for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations, as proposed in Embodiment 3 of the present invention;

[0060] Figure 5 A structural diagram showing a comprehensive substation bay utilization calculation system considering load characteristics and fluctuations proposed in Example 5 of the present invention. DETAILED DESCRIPTION

[0061] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0062] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the actual size;

[0063] It is understandable to those skilled in the art that descriptions of certain well-known contents may be omitted in the drawings.

[0064] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0065] The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent;

[0066] Example 1

[0067] This embodiment proposes a method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations. The flow chart of this method is shown in FIG. Figure 1 , including the following steps:

[0068] S1. Obtain the operating data of a substation and the basic parameters of the substation line;

[0069] S2. Calculate the idealized substation bay utilization based on substation operating data and substation line basic parameters;

[0070] S3. Use load characteristics to correct the idealized substation interval utilization rate to obtain the practical substation interval utilization rate;

[0071] S4. Calculate the supplementary evaluation index of the practical interval utilization rate of substations based on load fluctuation;

[0072] S5. Calculate the comprehensive utilization rate of substation intervals based on the practical utilization rate of substation intervals and supplementary evaluation indicators.

[0073] In this embodiment, the operating data of a certain substation and the basic parameters of the substation line are first obtained. Based on the operating data of the substation and the basic parameters of the substation line, the idealized interval utilization of the substation is calculated, and the idealized interval utilization of the substation is corrected using the load characteristics to obtain the practical interval utilization of the substation, thereby accurately reflecting the actual usage of the substation interval. Then, based on the load fluctuation, a supplementary evaluation index of the practical interval utilization of the substation is calculated. Based on the practical interval utilization of the substation and the supplementary evaluation index, the comprehensive utilization rate of the substation interval is calculated, which accurately expresses the potential for improving the substation interval utilization and interval resource utilization, thereby promoting the improvement of the power supply efficiency and reliability of the power system in the power grid supply area.

[0074] Example 2

[0075] In this embodiment, substation operational data includes: the substation's annual maximum utilization hours and electricity price, the total number of line bays, the total number of public line bays, and the total number of dedicated line bays. Basic substation line parameters include: the annual power supply per feedback line, trunk line safety current, power factor, transfer factor, construction cost, interest rate, years of operation, annual load and electricity consumption curve, safety load and its average value, and annual actual power load and its average value.

[0076] Taking a 110kV substation as an example, the maximum annual hourly utilization of a 110kV substation is 1704 hours, the electricity price is 1.495 yuan / kWh, and the total number of line bays in the selected substation is 24, all of which are public bays. The annual power supply of each feedback line of the substation, the main line safety current, power factor, power transfer factor, construction cost and interest rate, and operation years are shown in Table 1:

[0077] Table 1

[0078]

[0079]

[0080] The safe load and average value of each feedback line of the substation, and the actual annual power load and average value are shown in Table 2:

[0081] Table 2

[0082]

[0083]

[0084] In this embodiment, the annual power load curve of each feedback line of the selected substation is as follows: Figure 2 As shown in the figure, the actual annual electricity load curve is as follows Figure 3 As shown, the annual power load and annual actual power load of each feedback line of the selected substation are data for the whole year of 2023.

[0085] In this embodiment, the process of calculating the idealized bay utilization rate of a substation includes:

[0086] Calculate the idealized feeder spacing capacity factors of the substation public line and the substation dedicated line respectively, where the substation public line feeder spacing capacity factor e 1,g,i The calculation expression is:

[0087]

[0088] Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,i is the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, T max is the annual maximum utilization hours of the substation;

[0089] Calculate the substation utility line feeder bay capacity factor e 1,g,i and the feeder spacing capacity factor e of the dedicated substation line 1,z,iThe weighted average of the idealized interval utilization rate of the substation is taken as the weighted average, and the expression is:

[0090]

[0091] Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

[0092] Specifically, the selected substation utility line feeder interval capacity factor e 1,g,i and the feeder spacing capacity factor e of the dedicated substation line 1,z,i The specific values are shown in Table 4:

[0093] Table 4

[0094] Feeder name Feeder 1 Feeder 2 Feeder 3 Feeder 4 Feeder 5 Feeder 6 Idealized interval capacity factor 127.70％ 66.72％ 83.71％ 135.41％ 64.89％ 73.75％ Feeder name Feeder 7 Feeder 8 Feeder 9 Feeder 10 Feeder 11 Feeder 12 Idealized interval capacity factor 49.01％ 89.53％ 100.71％ 91.16％ 66.18％ 34.17％ Feeder name Feeder 13 Feeder 14 Feeder 15 Feeder 16 Feeder 17 Feeder 18 Idealized interval capacity factor 74.17％ 129.70％ 82.62％ 41.30％ 74.66％ 43.68％ Feeder name Feeder 19 Feeder 20 Feeder 21 Feeder 22 Feeder 23 Feeder 24 Idealized interval capacity factor 74.17％ 129.70％ 82.62％ 41.30％ 74.66％ 43.68％

[0095] Using the above calculation process, the idealized interval utilization rate of the substation is obtained as e1=44.55%.

[0096] In this embodiment, the process of correcting the idealized bay utilization of a substation using load characteristics includes:

[0097] Calculate the practical feeder interval capacity factor e of the substation public line after load characteristics correction 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i , where the practical feeder spacing capacity factor e of the substation utility line is 2,g,i The calculation expression is:

[0098]

[0099] Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,i is the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, η i,t The electricity load data ranked as t in the load data collected every 15 minutes for the i-th public line interval;

[0100] Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The calculation expression is:

[0101]

[0102] Among them, Qi is the economic benefit of the ith dedicated line bay of the substation, A z,i is the annual power supply of the feeder in the i-th dedicated line bay, Q M is the electricity price, M is the feeder construction cost of the i-th dedicated line bay, Q k,i is the capacity usage fee of the ith dedicated line interval, r is the interest rate, n is the feeder operation year of the ith dedicated line interval, I z,i is the feeder trunk line safety current of the ith dedicated line bay, α z,i is the feeder power factor of the ith dedicated line bay, k z,i is the feeder transfer factor of the i-th dedicated line bay, η i,t The power load data ranked as t in the load data collected every 15 minutes for the i-th dedicated line interval;

[0103] Calculate the practical feeder spacing capacity factor e of the substation utility line 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The weighted average of the ideal interval utilization rate of the substation is taken as the weighted average, and the expression is:

[0104]

[0105] Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

[0106] Specifically, the practical feeder interval capacity factor e of the selected substation public line is 2,g,i and practical feeder spacing capacity factor e for dedicated substation lines 1,z,i The specific values are shown in Table 5:

[0107] Table 5

[0108] Feeder name Feeder 1 Feeder 2 Feeder 3 Feeder 4 Feeder 5 Feeder 6 Practical interval capacity factor 133.01％ 82.40％ 109.92％ 147.34％ 107.49％ 135.53％ Feeder name Feeder 7 Feeder 8 Feeder 9 Feeder 10 Feeder 11 Feeder 12 Practical interval capacity factor 84.68％ 83.91％ 113.87％ 81.77％ 83.59％ 50.28％ Feeder name Feeder 13 Feeder 14 Feeder 15 Feeder 16 Feeder 17 Feeder 18 Practical interval capacity factor 109.68％ 163.86％ 90.22％ 93.78％ 85.51％ 38.21％ Feeder name Feeder 19 Feeder 20 Feeder 21 Feeder 22 Feeder 23 Feeder 24 Practical interval capacity factor 32.35％ 181.28％ 69.47％ 86.63％ 69.44％ 254.63％

[0109] Using the above calculation process, the practical interval utilization rate of the substation is obtained as e2=104.34%.

[0110] In this embodiment, the supplementary evaluation index P of the utility interval utilization rate of the substation in step S4 is i The calculation expression is:

[0111]

[0112] in, is the average value of the safety load of the i-th feedback line, P B,i,tis the safe load of the selected feeder at time t, which is a fixed value. is the average value of the actual power load of the i-th feedback line, P L,i,t is the actual power load of the selected feeder at time t.

[0113] Specifically, the supplementary evaluation index P of the practical interval utilization rate of each feedback line of the selected substation is i The specific values are shown in Table 6:

[0114] Table 6

[0115] Feeder name Feeder 1 Feeder 2 Feeder 3 Feeder 4 Feeder 5 Feeder 6 Supplementary evaluation indicators 0.06606 0.0078593 0.02678 0.019305 0.0038509 0.018488 Feeder name Feeder 7 Feeder 8 Feeder 9 Feeder 10 Feeder 11 Feeder 12 Supplementary evaluation indicators 0.1559 0.036429 0.1024 0.064649 0.02545 0.031457 Feeder name Feeder 13 Feeder 14 Feeder 15 Feeder 16 Feeder 17 Feeder 18 Supplementary evaluation indicators 0.032719 0.037941 0.059351 0.038484 0.0037075 0.10425 Feeder name Feeder 19 Feeder 20 Feeder 21 Feeder 22 Feeder 23 Feeder 24 Supplementary evaluation indicators 0.15486 0.034763 0.096451 0.018139 0.015501 0.027117

[0116] In this embodiment, the process of calculating the comprehensive utilization rate of the transformer substation interval in step S5 includes: calculating the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , the process is:

[0117] The practical interval capacity factor e of the i-th feedback line 2,i and supplementary evaluation index P i The value of is divided into several levels, where each level corresponds to a score interval;

[0118] The practical interval capacity factor e of the i-th feedback line is calculated based on the quadratic function curve using the least squares method. 2,i and supplementary evaluation index P i The value of is fitted to the specific score in the score range of the corresponding level, and the practical interval capacity factor e of the i-th feedback line is obtained respectively. 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i .

[0119] Specifically, the practical interval capacity factor e of the i-th feedback line 2,i and supplementary evaluation index P i The values are divided into five levels: high, medium-high, medium, medium-low, and low. The corresponding score ranges are shown in Table 7:

[0120] Table 7

[0121] grade Supplementary evaluation index p Score <![CDATA[Practical interval capacity factor e2]]> Score high [0.8,1] [70,100) [95,100] 100 medium to high [0.6,0.8) [50,70) [90,95) [90,100) middle [0.5,0.6) [40,50) [85-90) [70-90) Medium-low [0.3,0.5) [20,40) [80-85] (60-70) Low <0.3 <20 <80 or >100 60

[0122] Specifically, the practical interval capacity factor e of the i-th feedback line 2,i The scoring formula after fitting is:

[0123] y 1,i =-0.011x2 +4.828x-253.7

[0124] Supplementary evaluation index P for the i-th feedback line i The scoring formula after fitting is:

[0125] y 2,i =26.24x 2 +69.4x-1.92

[0126] Specifically, calculate the practical interval capacity factor e of the i-th feedback line respectively 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , the calculation results are shown in Table 8:

[0127] Table 8

[0128]

[0129] In this embodiment, the process of calculating the comprehensive utilization rate of the transformer substation interval in step S5 further includes: based on the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , calculate the comprehensive score y of the i-th feedback line i , the expression is:

[0130]

[0131] The comprehensive score y based on the i-th feedback line i , calculate the comprehensive substation interval utilization rate e3, the expression is:

[0132]

[0133] Where S is the total number of line bays in the substation.

[0134] Specifically, the calculation results of the comprehensive score of the i-th feedback line of the selected substation are shown in Table 9:

[0135] Table 9

[0136] Feeder name Feeder 1 Feeder 2 Feeder 3 Feeder 4 Feeder 5 Feeder 6 <![CDATA[Composite score y i > 31.39 35.41 30.02 30.29 30.83 30.31 Feeder name Feeder 7 Feeder 8 Feeder 9 Feeder 10 Feeder 11 Feeder 12 <![CDATA[Composite score y i > 42.9 37.3 32.73 35.11 36.58 30.14 Feeder name Feeder 13 Feeder 14 Feeder 15 Feeder 16 Feeder 17 Feeder 18 <![CDATA[Composite score y i > 30.19 30.38 47.32 51.55 40.19 32.8 Feeder name Feeder 19 Feeder 20 Feeder 21 Feeder 22 Feeder 23 Feeder 24 <![CDATA[Composite score y i > 30.19 30.38 47.32 51.55 40.19 32.8

[0137] Using the above calculation process, the comprehensive utilization rate of the selected substation combat interval e3 = 33.46% is obtained.

[0138] Example 3

[0139] This embodiment proposes a device for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations. The device's composition and structure diagram can be found in Figure 4 , including a processor 101 and at least one memory 102 connected to the processor, wherein: the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the substation interval comprehensive utilization rate calculation method taking into account load characteristics and fluctuations as described in Example 1 or Example 2.

[0140] Example 4

[0141] This embodiment proposes a computer-readable storage medium on which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in Example 1 or Example 2.

[0142] Example 5

[0143] This embodiment proposes a comprehensive substation bay utilization calculation system that considers load characteristics and fluctuations. The system structure diagram is shown in Figure 5 The system is used to implement the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in Example 1 or Example 2, including:

[0144] Substation basic data acquisition module, used to obtain the operating data of a substation and the basic parameters of the substation line;

[0145] An idealized bay utilization calculation module is used to calculate the idealized bay utilization of the substation based on the substation operation data and substation line basic parameters;

[0146] A practical interval utilization calculation module is used to correct the ideal interval utilization of the substation using load characteristics to obtain the practical interval utilization of the substation;

[0147] A supplementary evaluation index calculation module is used to calculate the supplementary evaluation index of the practical interval utilization rate of the substation based on load fluctuation;

[0148] The substation interval comprehensive utilization rate calculation module is used to calculate the substation comprehensive interval utilization rate based on the substation practical interval utilization rate and supplementary evaluation indicators.

[0149] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations, characterized in that: The following steps are involved: S1. Obtain the operating data of a substation and the basic parameters of the substation line; S2. Calculate the idealized substation bay utilization based on substation operating data and substation line basic parameters; S3. Use load characteristics to correct the idealized substation interval utilization rate to obtain the practical substation interval utilization rate; S4. Calculate the supplementary evaluation index of the practical interval utilization rate of substations based on load fluctuation; S5. Calculate the comprehensive utilization rate of substation intervals based on the practical utilization rate of substation intervals and supplementary evaluation indicators.

2. A method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations according to claim 1, characterized in that: The substation operation data includes: the annual maximum utilization hours and electricity price of the substation, the total number of line intervals of the substation, the total number of public line intervals of the substation, and the total number of dedicated line intervals of the substation; The basic parameters of the substation line include: annual power supply of each feedback line of the substation, main line safety current, power factor, power transfer factor, construction cost, interest rate, operating years, annual load power curve, capacity usage fee of the substation dedicated line interval, feeder safety load and its average value, annual actual power load and its average value.

3. A method for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations according to claim 2, characterized in that: The process of calculating the idealized bay utilization of a substation includes: Calculate the ideal feeder spacing capacity factor of the substation public line and the substation dedicated line respectively, where the ideal feeder spacing capacity factor of the substation public line is e 1,g,i The calculation expression is: Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,i is the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, T max is the annual maximum utilization hours of the substation; Idealized feeder spacing capacity factor e of dedicated substation lines 1,z,i The calculation expression is: Among them, Q i is the economic benefit of the ith dedicated line bay of the substation, A z,i is the annual power supply of the feeder in the i-th dedicated line bay, Q M is the electricity price, M is the feeder construction cost of the i-th dedicated line bay, Q k,i is the capacity usage fee of the ith dedicated line interval, r is the interest rate, n is the feeder operation year of the ith dedicated line interval, T max is the annual maximum utilization hours of the substation, I z,i is the feeder trunk line safety current of the ith dedicated line bay, α z,i is the feeder power factor of the ith dedicated line bay, k z,i is the feeder transfer factor of the i-th dedicated line bay; Calculate the idealized feeder spacing capacity factor e of the substation utility line 1,g,i and ideal feeder spacing capacity factor e of dedicated substation lines 1,z,i The weighted average of the idealized interval utilization rate of the substation is taken as the weighted average, and the expression is: Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

4. A method for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations according to claim 3, characterized in that: The process of correcting the idealized bay utilization of a substation using load characteristics includes: Calculate the practical feeder interval capacity factor e of the substation public line after load characteristics correction 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i , where the practical feeder spacing capacity factor e of the substation utility line is 2,g,i The calculation expression is: Among them, A g,i is the annual power supply of the feeder in the ith utility line bay, I g,i is the feeder trunk line safety current of the ith common line bay, α g,i is the feeder power factor of the ith utility line bay, k g,i is the feeder transfer factor of the ith utility line bay, η i,t The electricity load data ranked as t in the load data collected every 15 minutes for the i-th public line interval; Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The calculation expression is: Among them, Q i is the economic benefit of the ith dedicated line bay of the substation, A z,i is the annual power supply of the feeder in the i-th dedicated line bay, Q M is the electricity price, M is the feeder construction cost of the i-th dedicated line bay, Q k,i is the capacity usage fee of the ith dedicated line interval, r is the interest rate, n is the feeder operation year of the ith dedicated line interval, I z,i is the feeder trunk line safety current of the ith dedicated line bay, α z,i is the feeder power factor of the ith dedicated line bay, k z,i is the feeder transfer factor of the i-th dedicated line bay, η i,t The power load data ranked as t in the load data collected every 15 minutes for the i-th dedicated line interval; Calculate the practical feeder spacing and capacity factor e of the substation utility line 2,g,i Practical feeder spacing capacity factor e for dedicated substation lines 2,z,i The weighted average of the substation interval utilization rate e2 is taken as the weighted average, and the expression is: Among them, n g is the total number of utility line bays in the substation, n z is the total number of dedicated line bays in the substation, and S is the total number of line bays in the substation.

5. The method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations according to claim 1 is characterized in that: The supplementary evaluation index P of the utility interval utilization rate of the substation in step S4 is i The calculation expression is: in, is the average value of the safety load of the i-th feedback line, P B,i,t is the safe load of the selected feeder at time t, which is a fixed value. is the average value of the actual power load of the i-th feedback line, P L,i,t is the actual power load of the selected feeder at time t.

6. A method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations according to claim 4 or 5, characterized in that: The process of calculating the comprehensive utilization rate of the transformer substation interval in step S5 includes: calculating the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , the process is: The practical interval capacity factor e of the i-th feedback line 2,i and supplementary evaluation index P i The value of is divided into several levels, where each level corresponds to a score interval; The practical interval capacity factor e of the i-th feedback line is calculated based on the quadratic function curve using the least squares method. 2,i and supplementary evaluation index P i The value of is fitted to the specific score in the score range of the corresponding level, and the practical interval capacity factor e of the i-th feedback line is obtained respectively. 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i .

7. A method for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations according to claim 6, characterized in that: The process of calculating the comprehensive utilization rate of the transformer substation interval in step S5 further includes: based on the practical interval capacity factor e of the i-th feedback line 2,i The score y 1,i and supplementary evaluation index P i The score y 2,i , calculate the comprehensive score y of the i-th feedback line i , the expression is: The comprehensive score y based on the i-th feedback line i , calculate the comprehensive utilization rate of substation interval e3, the expression is: Where S is the total number of line bays in the substation.

8. A device for calculating the comprehensive utilization rate of a substation interval taking into account load characteristics and fluctuations, characterized in that: The method comprises at least one processor and at least one memory connected to the processor, wherein the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, the computer program including program instructions. When the program instructions are executed by a computer, the computer is caused to execute the method for calculating the comprehensive utilization rate of substation intervals taking into account load characteristics and fluctuations as described in any one of claims 1 to 7.

10. A comprehensive substation bay utilization calculation system considering load characteristics and fluctuations, characterized in that: The system is used to implement the method according to any one of claims 1 to 7, including: Substation basic data acquisition module, used to obtain the operating data of a substation and the basic parameters of the substation line; An idealized bay utilization calculation module is used to calculate the idealized bay utilization of the substation based on the substation operation data and substation line basic parameters; A practical interval utilization calculation module is used to correct the ideal interval utilization of the substation using load characteristics to obtain the practical interval utilization of the substation; A supplementary evaluation index calculation module is used to calculate the supplementary evaluation index of the practical interval utilization rate of the substation based on load fluctuation; The substation interval comprehensive utilization rate calculation module is used to calculate the substation comprehensive interval utilization rate based on the substation practical interval utilization rate and supplementary evaluation indicators.

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