CN113988694A - Urban power grid comprehensive evaluation method under weak connection high-proportion new energy access - Google Patents

Urban power grid comprehensive evaluation method under weak connection high-proportion new energy access Download PDF

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CN113988694A
CN113988694A CN202111333203.9A CN202111333203A CN113988694A CN 113988694 A CN113988694 A CN 113988694A CN 202111333203 A CN202111333203 A CN 202111333203A CN 113988694 A CN113988694 A CN 113988694A
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power grid
new energy
comprehensive evaluation
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urban power
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张天宇
李慧
宣文博
刘忠义
丁承第
闫大威
王魁
雷铮
宋佳
李媛媛
罗涛
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Abstract

The invention provides a comprehensive evaluation method of an urban power grid under weak connection high-proportion new energy access, which comprises the following steps: through the analysis of an electric power system, acquiring an index system with 5 dimensions of full life cycle cost, short circuit capacity adequacy, power supply regulation flexibility margin, new energy consumption margin and alternating current and direct current network hardness; respectively weighting the 5-dimensional index systems, and obtaining comprehensive evaluation scores; and evaluating the urban power grid according to the obtained comprehensive evaluation score: in the planning stage, the scheme with higher comprehensive evaluation score is used as the optimal planning scheme for implementation and construction; in the operation stage, the comprehensive evaluation scores of the urban power grid are researched, each score is compared, and the dimension with low score proves that the operation power grid is defective and needs to be complemented by operation measures. The invention increases the evaluation of the direct current system and the evaluation of the alternating current-direct current interactive system, so that the whole evaluation system is more complete and scientific, and is suitable for the development direction of the urban power grid in the future.

Description

Urban power grid comprehensive evaluation method under weak connection high-proportion new energy access
Technical Field
The invention relates to the technical field of urban power grid planning, in particular to a comprehensive evaluation method of an urban power grid under weak connection high-proportion new energy access.
Background
Aiming at an urban power grid, in a specific stage of unbalanced structural development of an alternating-current and direct-current power transmission form, the weak connection of a high-proportion new power supply is an important characteristic of the power grid. Most of the existing power grid planning evaluation focuses on a power system with a low traditional renewable energy ratio, the characteristics of an alternating-current and direct-current hybrid power grid are not considered, and the urban power grid evaluation requirement of weak connection high-ratio new power supply access cannot be met. In an urban power grid evaluation system, evaluation on characteristics such as alternating current and direct current and new energy is urgently needed.
Therefore, it is necessary to research a comprehensive urban power grid evaluation method under the condition of weak connection and high-proportion new energy access of a planning comprehensive evaluation index system considering new characteristics of the urban power grid.
Disclosure of Invention
The invention aims to design a comprehensive urban power grid evaluation method under the condition of weak connection and high-proportion new energy access of a planning comprehensive evaluation index system considering new characteristics of an urban power grid.
The invention provides a comprehensive evaluation method of an urban power grid under weak connection high-proportion new energy access, which comprises the following steps:
through the analysis of an electric power system, acquiring an index system with 5 dimensions of full life cycle cost, short circuit capacity adequacy, power supply regulation flexibility margin, new energy consumption margin and alternating current and direct current network hardness;
respectively weighting the 5-dimensional index systems, and obtaining comprehensive evaluation scores;
and evaluating the urban power grid according to the obtained comprehensive evaluation score: in the planning stage, the scheme with higher comprehensive evaluation score is used as the optimal planning scheme for implementation and construction; in the operation stage, the comprehensive evaluation scores of the urban power grid are researched, each score is compared, and the dimension with low score proves that the operation power grid is defective and needs to be complemented by operation measures.
Further, the obtained life cycle cost evaluation index r1Comprises the following steps:
r1＝Cinv+Cop+Cf
wherein, CinvFor investment cost, CopCost for operating and maintaining, CfTo cost of failure;
wherein the failure cost CfThe following were used:
Figure BDA0003349690410000021
in the formula, H1Is a set of equipment faults; q. q.siAnd piRespectively the probability of the failure of the device i and the corresponding minimum load shedding amount; ρ is the average electricity price; t is the study period.
Further, the obtained evaluation index r of the short circuit capacity adequacy2Comprises the following steps:
Figure BDA0003349690410000022
wherein m is the number of bus bars, IiWhich represents the short-circuit current of the bus i,
Figure BDA0003349690410000023
the maximum short-circuit current breaking current of the bus i breaker is shown.
Further, the obtained evaluation index r of the power supply regulation flexible margin3Comprises the following steps:
Fup＝min(Rupτ,Pmax-P)
Fdown＝min(Rdownτ,P-Pmin)
r3＝Fup+Fdown
wherein τ is a time scale; rup、RdownThe climbing speeds of the conventional unit are upward and downward respectively; pmax、PminRespectively realizing maximum and minimum technical output of a conventional unit; and P is the rated technical output of the unit.
Further, the obtained evaluation index of the consumption margin of the new energy comprises the electric quantity ratio r of the new energy4-1Energy rejection rate r4-2Wherein the new energy electric quantity accounts for r4-1Comprises the following steps:
Figure BDA0003349690410000024
Gn、Gsrespectively representing the generated energy of the new energy and the total electricity consumption of the whole society;
energy rejection rate r4-2Comprises the following steps:
Figure BDA0003349690410000025
GNthe maximum electric quantity which can be sent out by the new energy source is represented.
Further, the obtained alternating current and direct current power grid strength index r5Comprises the following steps:
r5＝(maxλ(Jz))-1
wherein, Jzλ is the characteristic value of the impedance matrix of the AC system for the weighted impedance matrix of the AC system, where JzComprises the following steps:
Figure BDA0003349690410000031
Znmrepresenting the impedance between nodes n and m; pnRepresenting the weight of node n.
Further, acquiring the weight of each index, and normalizing the indexes; wherein the weight w of each indexiComprises the following steps:
Figure BDA0003349690410000032
in the formula, wi_1The ith index adopts artificial subjective weight, wi_2And the weight which represents the ith index and adopts objective calculation is as follows:
Figure BDA0003349690410000033
in the formula, xiIs the statistical variance of index i in all the schemes to be evaluated.
The invention has the advantages and positive effects that:
compared with the existing index system only evaluating the alternating current system, the method is more complete, the evaluation on the direct current system and the evaluation on the alternating current-direct current interactive system are added, and the evaluation on the power grid absorption capacity and the evaluation on the flexibility of the traditional thermal power generating unit when new energy is accessed into the power grid are added, so that the whole evaluation system is more complete and scientific, and is suitable for the development direction of the urban power grid in the future.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The retail package pricing method considering price type demand response constructs a demand response model, analyzes the cost-income function of the electricity selling company containing electricity selling income, electricity purchasing expenditure, response income and the like, constructs the retail package pricing model, and provides decision support for the retailer from the perspective of optimized pricing.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The comprehensive evaluation method of the urban power grid under the condition of weak connection high-proportion new energy access comprises the following steps:
through the analysis of an electric power system, acquiring an index system with 5 dimensions of full life cycle cost, short circuit capacity adequacy, power supply regulation flexibility margin, new energy consumption margin and alternating current and direct current network hardness;
respectively weighting the 5-dimensional index systems, and obtaining comprehensive evaluation scores;
and evaluating the urban power grid according to the obtained comprehensive evaluation score: in the planning stage, the scheme with higher comprehensive evaluation score is used as the optimal planning scheme for implementation and construction; in the operation stage, the comprehensive evaluation scores of the urban power grid are researched, each score is compared, and the dimension with low score proves that the operation power grid is defective and needs to be complemented by operation measures.
Specifically, the obtained life cycle cost evaluation index r1Comprises the following steps:
r1＝Cinv+Cop+Cf
wherein, CinvFor investment cost, CopCost for operating and maintaining, CfTo cost of failure;
wherein the failure cost CfThe following were used:
Figure BDA0003349690410000041
in the formula, H1Is a set of equipment faults; q. q.siAnd piRespectively the probability of the failure of the device i and the corresponding minimum load shedding amount; ρ is the average electricity price; t is the study period.
Obtained short circuit capacity adequacy evaluation index r2Comprises the following steps:
Figure BDA0003349690410000042
wherein m is the number of bus bars, IiWhich represents the short-circuit current of the bus i,
Figure BDA0003349690410000043
the maximum short-circuit current breaking current of the bus i breaker is shown.
Obtained power supply regulation flexible margin evaluation index r3Comprises the following steps:
Fup＝min(Rupτ,Pmax-P)
Fdown＝min(Rdownτ,P-Pmin)
r3＝Fup+Fdown
wherein τ is a time scale; rup、RdownThe climbing speeds of the conventional unit are upward and downward respectively; pmax、PminRespectively realizing maximum and minimum technical output of a conventional unit; and P is the rated technical output of the unit.
The obtained evaluation index of the consumption margin of the new energy comprises the electric quantity ratio r of the new energy4-1Energy rejection rate r4-2Wherein the new energy electric quantity accounts for r4-1Comprises the following steps:
Figure BDA0003349690410000051
Gn、Gsrespectively represent newEnergy generating capacity and total power consumption of the whole society;
energy rejection rate r4-2Comprises the following steps:
Figure BDA0003349690410000052
GNthe maximum electric quantity which can be sent out by the new energy source is represented.
The obtained alternating current and direct current grid strength index r5Comprises the following steps:
r5＝(maxλ(Jz))-1
wherein, Jzλ is the characteristic value of the impedance matrix of the AC system for the weighted impedance matrix of the AC system, where JzComprises the following steps:
Figure BDA0003349690410000053
Znmrepresenting the impedance between nodes n and m; pnRepresenting the weight of node n.
Acquiring the weight of each index, and normalizing the indexes; wherein the weight w of each indexiComprises the following steps:
Figure BDA0003349690410000054
in the formula, wi_1The ith index adopts artificial subjective weight, wi_2And the weight which represents the ith index and adopts objective calculation is as follows:
Figure BDA0003349690410000055
in the formula, xiIs the statistical variance of index i in all the schemes to be evaluated.
For example, in this embodiment, two different planning schemes of a provincial city power grid in China are comprehensively evaluated. The urban power grid transmission network consists of 1000kV, 500kV and 220kV, and the total number of the transformer substations is 113.
Aiming at the power grid development, two planning schemes are formed, and the whole life cycle time is 20 years; according to a provincial power grid power transmission and distribution price pricing method, the operation and maintenance cost is not higher than 1.5% of the original value of the newly added fixed assets in the supervision period; the fixed asset residual value rate is unified to 5%; referring to the national power reliability indexes published by the union of China power enterprises in 2019, the forced outage rates of overhead lines and transformers are 0.064 times/hundred kilometers and 0.235 times/hundred years respectively, and the energy availability rate of a point-to-point extra-high voltage direct current transmission system is 82.0.83%; electricity prices are about 0.7 yuan/kWh; the short-circuit current limit values of 500kV and 220kV voltage levels are 63kA and 50kA respectively; the maximum peak-valley difference is 8000 MW; according to the 1-11 month electric power industry operation profile of 2020, published by the union of China electric power enterprises, the annual generation hours of the wind turbine generator set are about 2000 hours, and the annual generation hours of the photovoltaic generator set are about 1000 hours; pollutant emission parameters have been studied, e.g. CO2The discharge rate is 1730 kg/ton standard coal; the power supply coal consumption rate is set to 300 g/kwh. The typical operation mode is selected as the summer highest load point, the extreme operation mode is selected as the summer lowest load point, and the condition that wind power in the region is large is assumed.
The actual values of the 5 evaluation indices for the two planning schemes are shown in the following table:
TABLE 1 evaluation index results for two planning scenarios
Index (I) Planning scheme 1 Planning scheme 2
r1 11.22 million yuan 11.21 million yuan
r2 0.32 0.29
r3 1240MW 1136MW
r4-1 4.1％ 4.9％
r4-2 0 0
r5 2.13 2.13
The index weights are shown in the following table:
TABLE 2 index weight calculation results
Figure BDA0003349690410000061
Figure BDA0003349690410000071
Finally, each index is normalized to obtain the comprehensive evaluation condition of the two planning schemes, as shown in the following table.
TABLE 3 comprehensive evaluation of two planning scenarios
Composite score
Planning scheme 1 0.79
Planning scheme 2 0.83
According to the comprehensive scores of the planning scheme 1 and the planning scheme 2, the planning scheme 2 is superior to the planning scheme 1, and the urban power grid is planned and constructed according to the planning scheme 2.
Finally, it should be pointed out that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. The comprehensive evaluation method of the urban power grid under the condition of weak connection high-proportion new energy access is characterized by comprising the following steps:
through the analysis of an electric power system, acquiring an index system with 5 dimensions of full life cycle cost, short circuit capacity adequacy, power supply regulation flexibility margin, new energy consumption margin and alternating current and direct current network hardness;
respectively weighting the 5-dimensional index systems, and obtaining comprehensive evaluation scores;
and evaluating the urban power grid according to the obtained comprehensive evaluation score: in the planning stage, the scheme with higher comprehensive evaluation score is used as the optimal planning scheme for implementation and construction; in the operation stage, the comprehensive evaluation scores of the urban power grid are researched, each score is compared, and the dimension with low score proves that the operation power grid is defective and needs to be complemented by operation measures.
2. The comprehensive evaluation method for the urban power grid under the condition of weak connection and high-proportion new energy access according to claim 1,
obtained life cycle cost evaluation index r1Comprises the following steps:
r1＝Cinv+Cop+Cf
wherein, CinvFor investment cost, CopCost for operating and maintaining, CfTo cost of failure;
wherein the failure cost CfThe following were used:
Figure FDA0003349690400000011
in the formula, H1Is a set of equipment faults; q. q.siAnd piRespectively the probability of the failure of the device i and the corresponding minimum load shedding amount; ρ is the average electricity price; t is the study period.
3. The comprehensive evaluation method for the urban power grid under the condition of weak connection and high-proportion new energy access according to claim 1,
obtained short circuit capacity adequacy evaluation index r2Comprises the following steps:
Figure FDA0003349690400000012
wherein m is the number of bus bars, IiWhich represents the short-circuit current of the bus i,
Figure FDA0003349690400000013
the maximum short-circuit current breaking current of the bus i breaker is shown.
4. The comprehensive evaluation method for the urban power grid under the condition of weak connection and high-proportion new energy access according to claim 1, wherein the obtained evaluation index r of the flexible margin of power supply regulation3Comprises the following steps:
Fup＝min(Rupτ,Pmax-P)
Fdown＝min(Rdownτ,P-Pmin)
r3＝Fup+Fdown
wherein τ is a time scale; rup、RdownThe climbing speeds of the conventional unit are upward and downward respectively; pmax、PminRespectively realizing maximum and minimum technical output of a conventional unit; and P is the rated technical output of the unit.
5. The comprehensive evaluation method for the urban power grid under the condition of weak connection and high-proportion new energy access according to claim 1, wherein the obtained evaluation index of the consumption margin of the new energy comprises the electric quantity ratio r of the new energy4-1Energy rejection rate r4-2Wherein the new energy electric quantity accounts for r4-1Comprises the following steps:
Figure FDA0003349690400000021
Gn、Gsrespectively representing the generated energy of the new energy and the total electricity consumption of the whole society;
energy rejection rate r4-2Comprises the following steps:
Figure FDA0003349690400000022
GNthe maximum electric quantity which can be sent out by the new energy source is represented.
6. The comprehensive evaluation method for the urban power grid under the condition of weak connection and high-proportion new energy access according to claim 1, wherein the obtained hardness index r of the alternating current and direct current power grid5Comprises the following steps:
r5＝(maxλ(Jz))-1
wherein, Jzλ is the characteristic value of the impedance matrix of the AC system for the weighted impedance matrix of the AC system, where JzComprises the following steps:
Figure FDA0003349690400000023
Znmrepresenting the impedance between nodes n and m; pnRepresenting the weight of node n.
7. The comprehensive evaluation method for the urban power grid under the condition of the weak connection high-proportion new energy access according to claim 1, characterized by obtaining the weight of each index and normalizing the index; wherein the weight w of each indexiComprises the following steps:
Figure FDA0003349690400000031
in the formula, wi_1The ith index adopts artificial subjective weight, wi_2And the weight which represents the ith index and adopts objective calculation is as follows:
Figure FDA0003349690400000032
in the formula, xiIs the statistical variance of index i in all the schemes to be evaluated.
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