CN107742223B - Provincial power grid power transmission and distribution pricing method considering power grid characteristics - Google Patents

Provincial power grid power transmission and distribution pricing method considering power grid characteristics Download PDF

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CN107742223B
CN107742223B CN201710310455.7A CN201710310455A CN107742223B CN 107742223 B CN107742223 B CN 107742223B CN 201710310455 A CN201710310455 A CN 201710310455A CN 107742223 B CN107742223 B CN 107742223B
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阮博
欧阳俊
杨东俊
梅桢
刘巨
姚伟
邓琼
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Huazhong University of Science and Technology
State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
Xiangyang Power Supply Co of State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
Xiangyang Power Supply Co of State Grid Hubei Electric Power Co Ltd
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Abstract

The invention discloses a provincial power grid power transmission and distribution pricing method considering power grid characteristics, and relates to the power market. The power transmission and distribution pricing method fully considers the technical characteristics of power grids, and mainly determines the total permitted income sharing and transferring relation of all voltage classes according to the trend of power flow of a power transmission and distribution grid, namely, each voltage class power grid shares permitted income of all voltage class power grids supplying power to the voltage class power grid, so that the total permitted income of all voltage classes needing to be recovered through power transmission and distribution prices is obtained. The advantages are that: the method can reasonably reflect the difference of the power supply cost of each grade of power grid, is beneficial to eliminating the condition of cross subsidy in the power grid, guides the user to reasonably use the power, improves the use efficiency of power resources, and is suitable for the design of the power transmission and distribution price of the provincial power grid.

Description

Provincial power grid power transmission and distribution pricing method considering power grid characteristics
Technical Field
The invention relates to an electric power market, in particular to a pricing model and a pricing method for power transmission and distribution prices.
Background
The national economic system of China develops at a high speed in the form of market economy, and puts forward new requirements on the market system, the supervision system and the price system of the power industry. Although the power industry changes the problem of no separation of power grids since the 2002 power system reformation is implemented, and a main diversified competitive pattern of a power market is formed initially, the nine article of the state institute in 2015 indicates that the existing power industry does not have a complete power price forming mechanism, and the power price cross subsidy seriously difficultly reflects the actual power utilization cost. The provincial power transmission and distribution network is an intermediate link of the power grid, and an independent and reasonable provincial power transmission and distribution price pricing mechanism of the power grid can ensure reasonable distribution of power resources, elimination of cross subsidies, complete recovery of power transmission and distribution cost of provincial power enterprises and healthy and continuous development of the power enterprises.
The provincial-level power transmission and distribution price pricing mechanism comprises provincial-level power grid power transmission and distribution total permitted income control, total permitted income allocation and power transmission and distribution price formation. Theory and practice of transmission and distribution of electricity price [ M ] lyying, beijing: the Chinese power publishing agency indicates that the total permitted income control method of the existing provincial power grid is mainly divided into two categories: a control method based on return on investment and a control method based on achievement. The highest income of a power grid enterprise is given by a control mode based on performance, the power grid enterprise needs to create income by reducing cost, has negative effect on power grid investment, and is not beneficial to the condition of high-speed development of the power grid in China at present; the control method based on the return on investment rate is based on the cost of the power grid enterprise which is determined, the total permitted income of the power grid enterprise is determined according to the given income rate, the investment of the power grid enterprise is facilitated, and the control method based on the return on investment rate has a good positive effect on the high-speed development condition of the power grid in China, so that the total permitted income of the provincial power grid which needs to pass the power transmission and distribution price is determined in a control mode based on the return on investment rate. The literature is based on a pricing model of power transmission and distribution prices of different voltage grades of long-term marginal cost and application thereof [ J ]. power grid technology, 2011,07: 175-. The literature is based on research [ D ] on the formation mechanism and application of power transmission and distribution rates under a control mode, the university of north china electric power, 2012. The traditional peak load responsibility method carries out allocation of total permitted income step by step according to the power supply and power balance in the peak load period, an independent and reasonable power transmission and distribution pricing method fully considers the technical characteristics of a power grid, particularly, the allocation and transmission relation of the total permitted income of each voltage class needs to be determined according to the trend of power flow of a power transmission and distribution network, the total permitted income of each class of power grid, which needs to be recovered through power transmission and distribution price, cannot be accurately reflected by step in a provincial power grid with backflow power, and meanwhile, the peak load cannot well reflect the use degree of each class of users to the power grid. Therefore, a pricing method for power transmission and distribution of the provincial power grid considering the characteristics of the power grid is urgently needed, the use degree of each voltage level user to the power grid is fully reflected, the power supply cost difference is reasonably reflected, and the purposes of eliminating the subsidy of the price difference of electricity, guiding the user to reasonably use the electricity, improving the utilization efficiency of the power resources and promoting the continuous healthy development of power grid enterprises are achieved.
Disclosure of Invention
The purpose of the invention is: the power transmission and distribution cost calculation method fully considers the technical characteristics of the power grid, and mainly determines the total allowable income sharing and transferring relation of all voltage classes according to the trend of power flow of the power transmission and distribution network, namely, each voltage class power grid needs to share the allowable income of all voltage class power grids supplying power to the voltage class power grid, so that the lowest price of the total allowable income required to be recovered through power transmission and distribution services of each voltage class is obtained. The advantages are that: the method can reasonably reflect the difference of power supply cost of each grade of power grid, is beneficial to eliminating the condition of cross subsidy in the power grid, guides users to reasonably use power and improves the use efficiency of power resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a provincial power grid power transmission and distribution cost calculation method considering power grid characteristics comprises the following steps:
a. establishing a permissible income calculation model of each grade line and power transformation of the provincial power grid in the accounting period of the power transmission and distribution price according to the control mode of the return investment rate:
a1 calculation model of total permitted income I of power transmission and distribution based on return on investment rate control mode
Cost permitted + income permitted + tax fund
Wherein:
authorized cost of depreciation plus operating maintenance fee
Approved yield-billable effective assets x weighted average capital profitability
Weighted average capital gain rate ═ equity capital gain rate × (1-equity rate) + debt capital gain rate × equity rate;
a2 model for apportioning permitted income based on available assets
Calculating respectively permitted incomes of lines and substations with voltage class k
Figure GDA0002225531030000031
And
Figure GDA0002225531030000032
where k is 1,2, …,5 respectively represent 5 voltage levels from bottom to top
Figure GDA0002225531030000033
In the formula: a is the total original value of fixed assets of the line and the transformer,
Figure GDA0002225531030000034
and
Figure GDA0002225531030000035
respectively representing a line fixed asset original value and a transformation fixed asset original value with a voltage grade of k;
b. balance model for power supply and consumption of provincial power grid through calculation
Figure GDA0002225531030000036
Obtaining a supply with a voltage level kQuantity SkAnd the amount of power supplied from voltage level k to voltage level l
Figure GDA0002225531030000037
In the model: gk、DkAnd
Figure GDA0002225531030000038
respectively the power supply quantity of a power plant with the voltage grade of k, the power consumption quantity of a user and the line loss rate,
Figure GDA0002225531030000039
the loss rate of a transformer with a high-voltage side connected to a power grid with the voltage class k,
Figure GDA00022255310300000310
the amount of power supply, delta, obtained from the voltage class k grid for the voltage class l gridk/lThe ratio of the power supply amount from voltage class k to voltage class l to the total power supply amount from voltage class k to other voltage classes, LossLkAnd LossTkRespectively representing line loss electric quantity and variable loss electric quantity with voltage grade of k;
c. calculating power supply proportion of each voltage class transformer of provincial power grid
Figure GDA00022255310300000311
In the formula, h is larger than k
Figure GDA00022255310300000312
The ratio of the power supply of the upper voltage class h to the power supply of the lower voltage class k through the transformer of the voltage class h to the total power supply of the transformer of the voltage class h, where h < k is
Figure GDA0002225531030000041
The lower voltage class h supplies power to the upper voltage class k through the transformer of the voltage class k in proportion to the total power supply of the transformer of the voltage class k,
Figure GDA0002225531030000042
the amount of power supplied for voltage level h to voltage level k,
Figure GDA0002225531030000043
for the amount of power supplied from voltage level h to voltage level l,
Figure GDA0002225531030000044
the amount of power supplied for voltage level m to voltage level h,
Figure GDA0002225531030000045
for the amount of power supplied from voltage level k to voltage level l,
Figure GDA0002225531030000046
the power supply from voltage level m to voltage level k, h, k, l, m is 1,2, …, 5;
d. calculating power supply and sale rates β of each voltage class of provincial power gridh/k
Figure GDA0002225531030000047
In the formula, ShIs the total power supply of the voltage class h,
Figure GDA0002225531030000048
line loss rate is the voltage level h; dhThe electricity consumption of the user is the voltage grade h;
e. establishing a total permitted income calculation model of each voltage class of the provincial power grid based on a peak load responsibility method:
e1, calculating power transmission permission income B with voltage class hh，h＝1,2,…，5
Figure GDA0002225531030000049
In the formula (I), the compound is shown in the specification,
Figure GDA00022255310300000410
revenue is granted for the line for voltage class h;
Figure GDA00022255310300000411
allowable revenue for transformation of voltage class k αk/hThe power supply proportion of the voltage class k transformer is occupied when the upper-level voltage class k supplies power to the voltage class h;
Figure GDA00022255310300000412
the method comprises the following steps of (1) sharing the transformation permission income of a voltage class k when a superior voltage class k power grid supplies power to a voltage class h power grid;
Figure GDA00022255310300000413
allowable revenue for transformation of voltage class h αm/hThe power supply proportion of the transformer of the voltage class h is occupied when the lower-level voltage class m supplies power to the voltage class h;
Figure GDA00022255310300000414
the power transformation permission income of the voltage class h is shared when the lower-level voltage class m supplies power to the voltage class h;
e2, calculating the total permitted income E of the voltage class h which needs to be recovered through the power transmission and distribution priceh，h＝1,2,…，5
Figure GDA00022255310300000415
In the formula, EkIs the total permitted revenue for a voltage class k to be recovered by transmission and distribution of electricity prices, βk/hIs the power supply rate from voltage level k to voltage level h,
Figure GDA00022255310300000416
the total permitted revenue of the other voltage levels apportioned for voltage level h;
f. calculating power transmission and distribution cost pri with provincial power grid voltage class of h based on postage stamp methodh
Figure GDA0002225531030000051
Compared with the prior art, the invention has the following advantages: the provincial power grid power transmission and distribution cost calculation method considering the characteristics of the power grid is provided. Compared with literature [ D ] electric power college, 2012, of North China power university based on transmission and distribution price forming mechanism and application research in a control mode, the method takes power backflow practice in a provincial power grid into consideration, establishes a power supply and power supply balance model based on the power backflow practice, introduces an improved peak load responsibility method to share total permitted income among all levels of power grids, and calculates the total permitted income of all levels of power grids needing to be recovered through transmission and distribution prices. Compared with a pricing model of different voltage grade power transmission and distribution prices based on long-term marginal cost and an application [ J ]. power grid technology, 2011,07: 175-. The power transmission and distribution pricing method provided by the invention fully considers the technical characteristics of the power grid, accords with the practical operation of the power grid, can reasonably reflect the difference of power supply costs of the power grids of all levels, is beneficial to eliminating the serious cross subsidy condition in the existing power grid, and has good promotion effects on guiding users to reasonably use power, improving the use efficiency of power resources and promoting the health and sustainable development of power grid companies.
Drawings
Fig. 1 is a schematic flow chart of a method for calculating the power transmission and distribution cost of a provincial power grid in consideration of the characteristics of the power grid.
Fig. 2 is a supply and consumption power balance diagram of the provincial power grid in the second embodiment and the third embodiment.
Detailed Description
The method for calculating the transmission and distribution cost of the provincial power grid considering the characteristics of the power grid is described in detail below with reference to the attached drawings.
Example one
1. A provincial power grid power transmission and distribution pricing method considering power grid characteristics is characterized in that: the method comprises the following steps:
a. establishing a permissible income calculation model of each grade line and power transformation of the provincial power grid in the accounting period of the power transmission and distribution price according to the control mode of the return investment rate:
a1 calculation model of total permitted income I of power transmission and distribution based on return on investment rate control mode
Cost permitted + income permitted + tax fund
Wherein:
authorized cost of depreciation plus operating maintenance fee
Approved yield-billable effective assets x weighted average capital profitability
Weighted average capital gain rate ═ equity capital gain rate × (1-equity rate) + debt capital gain rate × equity rate;
a2 model for apportioning permitted income based on available assets
Calculating respectively permitted incomes of lines and substations with voltage class k
Figure GDA0002225531030000061
And
Figure GDA0002225531030000062
where k is 1,2, …,5 respectively represent 5 voltage levels from bottom to top
Figure GDA0002225531030000063
In the formula: a is the total original value of fixed assets of the line and the transformer,
Figure GDA0002225531030000064
and
Figure GDA0002225531030000065
respectively representing a line fixed asset original value and a transformation fixed asset original value with a voltage grade of k;
b. balance model for power supply and consumption of provincial power grid through calculation
Figure GDA0002225531030000066
Obtaining the power supply quantity S with the voltage level kkAnd the amount of power supplied from voltage level k to voltage level l
Figure GDA0002225531030000067
In the model: gk、DkAnd
Figure GDA0002225531030000068
respectively the power supply quantity of a power plant with the voltage grade of k, the power consumption quantity of a user and the line loss rate,
Figure GDA0002225531030000069
the loss rate of a transformer with a high-voltage side connected to a power grid with the voltage class k,
Figure GDA00022255310300000610
the amount of power supply, delta, obtained from the voltage class k grid for the voltage class l gridk/lThe ratio of the power supply amount from voltage class k to voltage class l to the total power supply amount from voltage class k to other voltage classes, LossLkAnd LossTkRespectively representing line loss electric quantity and variable loss electric quantity with voltage grade of k;
c. calculating power supply proportion of each voltage class transformer of provincial power grid
Figure GDA0002225531030000071
In the formula, h is larger than k
Figure GDA0002225531030000072
The ratio of the power supply of the upper voltage class h to the power supply of the lower voltage class k through the transformer of the voltage class h to the total power supply of the transformer of the voltage class h, where h < k is
Figure GDA0002225531030000073
The lower voltage class h supplies power to the upper voltage class k through the transformer of the voltage class k in proportion to the total power supply of the transformer of the voltage class k,
Figure GDA0002225531030000074
the amount of power supplied for voltage level h to voltage level k,
Figure GDA0002225531030000075
for the amount of power supplied from voltage level h to voltage level l,
Figure GDA0002225531030000076
the amount of power supplied for voltage level m to voltage level h,
Figure GDA0002225531030000077
for the amount of power supplied from voltage level k to voltage level l,
Figure GDA0002225531030000078
the power supply from voltage level m to voltage level k, h, k, l, m is 1,2, …, 5;
d. calculating power supply and sale rates β of each voltage class of provincial power gridh/k
Figure GDA0002225531030000079
In the formula, ShIs the total power supply of the voltage class h,
Figure GDA00022255310300000710
line loss rate is the voltage level h; dhThe electricity consumption of the user is the voltage grade h;
e. establishing a total permitted income calculation model of each voltage class of the provincial power grid based on a peak load responsibility method:
e1, calculating power transmission permission income B with voltage class hh，h＝1,2,…，5
Figure GDA00022255310300000711
In the formula (I), the compound is shown in the specification,
Figure GDA00022255310300000712
revenue is granted for the line for voltage class h;
Figure GDA00022255310300000713
of voltage class kPower transformation permitted income αk/hThe power supply proportion of the voltage class k transformer is occupied when the upper-level voltage class k supplies power to the voltage class h;
Figure GDA00022255310300000714
the method comprises the following steps of (1) sharing the transformation permission income of a voltage class k when a superior voltage class k power grid supplies power to a voltage class h power grid;
Figure GDA00022255310300000715
allowable revenue for transformation of voltage class h αm/hThe power supply proportion of the transformer of the voltage class h is occupied when the lower-level voltage class m supplies power to the voltage class h;
Figure GDA0002225531030000081
the power transformation permission income of the voltage class h is shared when the lower-level voltage class m supplies power to the voltage class h;
e2, calculating the total permitted income E of the voltage class h which needs to be recovered through the power transmission and distribution priceh，h＝1,2,…，5
Figure GDA0002225531030000082
In the formula, EkIs the total permitted revenue for a voltage class k to be recovered by transmission and distribution of electricity prices, βk/hIs the power supply rate from voltage level k to voltage level h,
Figure GDA0002225531030000083
the total permitted revenue of the other voltage levels apportioned for voltage level h;
f. based on the postage stamp method, calculating the power transmission and distribution price pri with the provincial power grid voltage class of hh
Figure GDA0002225531030000084
Example two
As shown in fig. 1, fig. 1 is a flowchart of a method for calculating power transmission and distribution costs of a provincial power grid considering characteristics of the power grid, and includes the following steps:
step a, establishing a permissible income calculation model of each grade line and power transformation of the provincial power grid in the accounting period of the power transmission and distribution price according to the control mode of the return on investment rate;
b, considering the power backflow reality of the power grid, and establishing a provincial power grid power supply and consumption balance model;
step c, calculating the power supply proportion of each voltage level of the provincial power grid;
step d, calculating the power supply and sale rates of all voltage levels of the provincial power grid;
step e, establishing a total permitted income calculation model of each voltage class of the provincial power grid based on a peak load responsibility method:
and f, calculating the provincial power grid transmission and distribution cost according to the voltage grades based on the stamp method.
In the step a, a calculation model of each voltage grade power grid line and transformation permitted income of the provincial power grid in the power transmission and distribution price accounting period is established according to the investment return rate control mode.
The permitted income calculation model comprises a provincial power grid power transmission and distribution total permitted income calculation model based on a return on investment rate control mode and a permitted income allocation model based on effective assets.
(1) Provincial power grid power transmission and distribution total permitted income calculation model based on return on investment rate control mode
The total permitted income of the provincial power grid power transmission and distribution refers to the income which is allowed to be obtained every year by provincial power grid enterprises in a regulation period and is approved by government related regulation departments according to related regulations. The total permitted income I is the basis of provincial power grid power transmission and distribution pricing, and the invention carries out the verification in a return on investment rate control mode:
cost permitted + income permitted + tax fund
Wherein:
1) authorized cost of depreciation plus operating maintenance fee
The depreciation cost refers to the cost of the power grid enterprise counted according to the original value and the depreciation rate of the fixed power transmission and distribution assets approved by a government price governing department.
The operation maintenance fee refers to the fee for maintaining the normal operation of the power grid enterprise, and includes material fee, repair fee, staff compensation and other fees.
2) Approved yield-billable effective assets x weighted average capital profitability
The effective assets capable of calculating and increasing the income refer to effective assets which are formed by the investment of the power grid enterprises and can obtain the investment income. The assets formed by the non-power grid enterprise investment such as user or local government unpaid transfer and the like do not increase the investment income. The specific items are approved by government price governing bodies.
Weighted average capital gain rate ═ equity capital gain rate × (1-equity rate) + equity capital gain rate × equity rate
Wherein: the equity capital earning rate is determined according to the investment opportunity loss of the average long-term national debt interest rate plus 1-3 percentage points in three years before the initial year of the supervision period; the debt capital earning rate is determined according to the loan rate level of more than 5 years of the average domestic commercial bank three years before the initial year of the supervision period; the asset liability rate is determined by referring to the average value of the asset liability rates of the power grid enterprises three years before the initial year of the supervision period.
3) The tax fund comprises enterprise income tax, city maintenance and construction tax and education fee addition.
(2) Permitted income apportionment model based on effective assets
The voltage grade of the power transmission and distribution price of the provincial power grid is determined, the total permitted income of the provincial power grid needs to be distributed to each voltage grade, and then the power transmission and distribution price is recovered through each voltage grade. However, in the power transmission and distribution service of the power grid, only the assets of the lines and the power transformation can be definitely collected according to the voltage levels, and considering that the proportion of other fixed assets which cannot be collected according to the voltage levels is not high, the total permitted income can be shared based on the proportion of the original values of the fixed effective assets of the lines and the power transformation of each voltage level, and the permitted income of the lines and the power transformation of which the voltage level is k is respectively calculated
Figure GDA0002225531030000101
And
Figure GDA0002225531030000102
where k is 1,2, …,5 respectively represent 5 voltage levels from bottom to top:
Figure GDA0002225531030000103
in the formula: a is the total original value of the fixed assets of the shared network line and the transformer,
Figure GDA0002225531030000104
for a line fixed asset value of voltage class k,
Figure GDA0002225531030000105
the original value of the transformer fixed asset is the voltage level k.
In the step b, considering the power backflow reality of the power grid, and establishing a balance model of the supply and consumption power during the provincial power grid accounting period;
the power supply and consumption balance model of the invention is shown in figure 2, and the power supply quantity, the power consumption quantity and the power consumption quantity of each voltage grade of the provincial power grid in the power transmission and distribution price accounting period are counted and calculated, so that the power supply and consumption quantities of the whole power grid and each voltage grade are balanced. Because power backflow exists in the characteristics of the power grid, the power supply model of the transformer needs to be described according to different situations, and the calculation formula is as follows:
Figure GDA0002225531030000106
in the above model, Sk、Gk、DkAnd
Figure GDA0002225531030000107
respectively the power supply quantity of a power plant with the voltage grade of k, the power consumption quantity of a user and the line loss rate,
Figure GDA0002225531030000108
the loss rate of a transformer with a high-voltage side connected to a power grid with the voltage class k,
Figure GDA0002225531030000109
for voltage class k to voltage class lThe amount of the supplied power is increased,
Figure GDA00022255310300001010
for the amount of supply output by voltage level l to voltage level k,
Figure GDA00022255310300001011
the amount of power supply, delta, obtained from the voltage class k grid for the voltage class l gridk/lThe ratio of the power supply amount from voltage class k to voltage class l to the total power supply amount from voltage class k to other voltage classes, LossLkAnd LossTkRespectively representing line loss electric quantity and variable loss electric quantity with voltage grade of k;
for provincial power grid G in accounting periodk、Dk、
Figure GDA00022255310300001012
Pk/lAre known numbers, and S can be obtained by solving according to the supply and consumption electric quantity balance modelk、LossTk、LossLk、δk/lAnd all formulas in the model are required to be satisfied to prove that the balance of the power supply and consumption of the whole network can be calculated as follows, otherwise, equal proportion adjustment is required
Figure GDA0002225531030000111
And
Figure GDA0002225531030000112
the power supply of the whole network is balanced.
In the step c, the power supply proportion of each voltage level of the provincial power grid is calculated based on the power supply and consumption balance model
Calculating the power supply proportion according to the balance model of the power supply and consumption of the provincial power grid in the accounting period, considering the power backflow condition in the power grid in the model, and explaining the power supply model of the transformer according to the condition, wherein the calculation formula is as follows:
Figure GDA0002225531030000113
in the formula, h is larger than k
Figure GDA0002225531030000114
The ratio of the power supply of the upper voltage class h to the power supply of the lower voltage class k through the transformer of the voltage class h to the total power supply of the transformer of the voltage class h, where h < k is
Figure GDA0002225531030000115
The lower voltage class h supplies power to the upper voltage class k through the transformer of the voltage class k in proportion to the total power supply of the transformer of the voltage class k,
Figure GDA0002225531030000116
the amount of power supplied for voltage level h to voltage level k,
Figure GDA0002225531030000117
for the amount of power supplied from voltage level h to voltage level l,
Figure GDA0002225531030000118
the amount of power supplied for voltage level m to voltage level h,
Figure GDA0002225531030000119
for the amount of power supplied from voltage level k to voltage level l,
Figure GDA00022255310300001110
the power supply from voltage level m to voltage level k, h, k, l, m is 1,2, …, 5;
in the step d, the power supply and sales rate β of each voltage level transformation of the provincial power grid is calculated based on the power supply and consumption balance modelh/k：
Figure GDA00022255310300001111
In the formula, ShIs the total power supply of the voltage class h,
Figure GDA00022255310300001112
line loss rate is the voltage level h; dhThe electricity consumption of the user is the voltage grade h;
in the step e, a total permitted income calculation model of each voltage class of the provincial power grid is established based on a peak load responsibility method:
the method improves the traditional peak-to-load responsibility method, and the basic idea of the improved peak-to-load responsibility method considering the characteristics of the power grid is as follows:
(1) the independent and reasonable power transmission and distribution pricing method fully considers the technical characteristics of power grids, particularly the total permitted income allocation and transfer relation of each voltage class needs to be determined according to the trend of power flow of a power transmission and distribution network, a power backflow existing in a provincial power grid is considered to establish a power supply and consumption balance model of the whole network, the permitted income allocation of each voltage class is carried out based on the model, namely, each voltage class power grid needs to allocate the permitted income of all voltage class power grids supplying power to the voltage class power grid, the permitted income allocation is not only carried out step by step according to the net power supply rate, and finally, the total permitted income needing to be recovered through the power transmission and distribution price of each voltage class is obtained by solving a group of linear.
(2) The independent and reasonable power transmission and distribution pricing method can reflect the use degree of users with different levels on the power grid, and the use degree of the users with different voltage levels on the power grid can be more accurately reflected by sharing permitted income by using the power consumption of the power grid of each level in the accounting period.
The total permitted income calculation of each voltage class power grid needing to be recovered through power transmission and distribution prices is divided into two parts:
(1) calculating a Transmission Admission revenue B for a Voltage class hh，h＝1,2,…，5
Figure GDA0002225531030000121
In the formula (I), the compound is shown in the specification,
Figure GDA0002225531030000122
revenue is granted for the line for voltage class h;
Figure GDA0002225531030000123
allowable revenue for transformation of voltage class k αk/hPower supply of voltage class k transformer for supplying power to voltage class h from upper voltage class kA ratio;
Figure GDA0002225531030000124
the method comprises the following steps of (1) sharing the transformation permission income of a voltage class k when a superior voltage class k power grid supplies power to a voltage class h power grid;
Figure GDA0002225531030000125
allowable revenue for transformation of voltage class h αm/hThe power supply proportion of the transformer of the voltage class h is occupied when the lower-level voltage class m supplies power to the voltage class h;
Figure GDA0002225531030000126
the power transformation permission income of the voltage class h is shared when the lower-level voltage class m supplies power to the voltage class h;
(2) calculating the total permitted income E of the voltage class h which needs to be recovered through power transmission and distribution priceh，h＝1,2,…，5
Figure GDA0002225531030000127
In the formula, EkIs the total permitted revenue for a voltage class k to be recovered by transmission and distribution of electricity prices, βk/hIs the power supply rate from voltage level k to voltage level h,
Figure GDA0002225531030000128
the total permitted revenue of the other voltage levels apportioned for voltage level h;
since the total permitted income may be shared between each voltage class, after the calculation of the permitted income for power transmission is completed, the total permitted income cannot be shared and calculated step by step, and a set of linear equations needs to be solved to obtain the total permitted income of each voltage class, and the calculation formula is as follows:
Figure GDA0002225531030000131
in step f, calculating the power transmission and distribution cost pri with the provincial power grid voltage class of h based on the postage stamp methodh。
The method for calculating the power transmission and distribution cost is based on a postage stamp method, namely, the total permitted income required to be recovered by the power transmission and distribution price of each grade of power grid is formed according to a calculation formula for apportioning the total permitted income of the provincial power grid and the total permitted income of each voltage grade based on the return rate in the power transmission and distribution price accounting period, and then the power transmission and distribution price is calculated according to the total power supply quantity of each grade of power grid in the accounting period. The algorithm simply, directly and transparently reflects the use degree of each grade of power grid to the power grid, has a good positive effect on eliminating cross subsidies, and has the following calculation formula:
Figure GDA0002225531030000132
EXAMPLE III
And d, obtaining the income of the power grid lines and the substation permission of each voltage class of the provincial power grid in one embodiment according to the calculation model obtained in the step a, and obtaining the result as shown in the table 1.
TABLE 1 provincial electric network five voltage class electric network line and transformation permission income
Figure GDA0002225531030000133
Statistics of provincial power grid G in one embodimentk、Dk、
Figure GDA0002225531030000134
Pk/lAnd b, establishing a supply and utilization power balance diagram of the provincial power grid as shown in the figure 2 according to the supply and utilization power balance model of the provincial power grid in the step b.
According to the embodiment shown in FIG. 2, the provincial power grid power utilization balance diagram and the provincial power grid power utilization model in the step b are calculated to obtain Sk、LossTk、LossLkAs shown in table 2.
TABLE 2 balance table for power supply and consumption of provincial electric network
Figure GDA0002225531030000141
According to the calculation formulas in the steps c and d and the data in the table 2, the power supply proportion α of each voltage class power transformation of the provincial power grid in one embodiment is calculatedh/kPower supply and sale rate βh/kAs shown in tables 3 and 4.
TABLE 3 proportion α of power supply for voltage transformation of provincial power gridh/k
Figure GDA0002225531030000142
TABLE 4 power supply and sale rates β of each voltage class transformation of provincial power gridh/k
Figure GDA0002225531030000143
According to the permitted income of each voltage grade power grid line of the provincial power grid in the table 1
Figure GDA0002225531030000144
Substation allowed revenue
Figure GDA0002225531030000145
And power supply proportion α of each voltage class transformation of the provincial power grid in tables 3 and 4h/kPower supply and sale rate βh/kObtaining permitted income B of power transmission of each voltage class of the provincial power grid according to the calculation formula in the step ehTotal permitted revenue EhAnd finally, obtaining the power transmission and distribution cost pri of each voltage class of the provincial power grid according to the calculation method of the power transmission and distribution price from each voltage class to each class in the step fhAs shown in table 5.
TABLE 5 provincial Power grid Voltage class Transmission Admission revenue, Total Admission revenue, and Transmission and distribution costs
Figure GDA0002225531030000151
The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (1)

1. A provincial power grid power transmission and distribution cost calculation method considering power grid characteristics is characterized by comprising the following steps:
a. establishing a permissible income calculation model of each grade line and power transformation of the provincial power grid in the accounting period of the power transmission and distribution price according to the control mode of the return investment rate:
a1 calculation model of total permitted income I of power transmission and distribution based on return on investment rate control mode
Cost permitted + income permitted + tax fund
Wherein:
authorized cost of depreciation plus operating maintenance fee
Approved yield-billable effective assets x weighted average capital profitability
Weighted average capital gain rate ═ equity capital gain rate × (1-equity rate) + debt capital gain rate × equity rate;
a2 model for apportioning permitted income based on available assets
Calculating respectively the permitted income C of the line and the transformation with the voltage level kL kAnd CT kWhere k is 1,2, …,5 respectively represent 5 voltage levels from bottom to top
Figure FDA0002332669610000011
In the formula: a is the total original value of fixed assets of the line and the transformer,
Figure FDA0002332669610000012
and
Figure FDA0002332669610000013
lines each representing a voltage level of kThe original value of the fixed asset and the original value of the transformation fixed asset;
b. balance model for power supply and consumption of provincial power grid through calculation
Figure FDA0002332669610000014
Obtaining the power supply quantity S with the voltage level kkAnd the amount of power supplied from voltage level k to voltage level l
Figure FDA0002332669610000021
Wherein l is 1,2, …, 5;
in the provincial power grid power supply and consumption balance model: gk、DkAnd
Figure FDA0002332669610000022
respectively the power supply quantity of a power plant with the voltage grade of k, the power consumption quantity of a user and the line loss rate,
Figure FDA0002332669610000023
the loss rate of a transformer with a high-voltage side connected to a power grid with the voltage class k,
Figure FDA0002332669610000024
the amount of power supply, delta, obtained from the voltage class k grid for the voltage class l gridk/lThe ratio of the power supply amount from voltage class k to voltage class l to the total power supply amount from voltage class k to other voltage classes, LossLkAnd LossTkRespectively representing line loss electric quantity and variable loss electric quantity with voltage grade of k;
c. calculating power supply proportion of each voltage class transformer of provincial power grid
Figure FDA0002332669610000025
In the formula, h is larger than k
Figure FDA0002332669610000026
Is an upper levelThe power supply amount of the voltage class h to the next voltage class k through the transformer of the voltage class h is in the proportion of the total power supply amount of the transformer of the voltage class h, when h is less than k
Figure FDA0002332669610000027
The power supply for the lower voltage class h to the upper voltage class k via the transformer of voltage class k is proportional to the total power supply of the transformer of voltage class k,
Figure FDA0002332669610000028
the amount of power supplied for voltage level h to voltage level k,
Figure FDA0002332669610000029
for the amount of power supplied from voltage level h to voltage level l,
Figure FDA00023326696100000210
the amount of power supplied for voltage level m to voltage level h,
Figure FDA00023326696100000211
for the amount of power supplied from voltage level k to voltage level l,
Figure FDA00023326696100000212
the power supply from voltage level m to voltage level k, h, k, l, m is 1,2, …, 5;
d. calculating power supply and sale rates β of each voltage class of provincial power gridh/k
Figure FDA00023326696100000213
In the formula, ShIs the total power supply of the voltage class h,
Figure FDA00023326696100000214
line loss rate is the voltage level h; dhThe electricity consumption of the user is the voltage grade h;
e. establishing a total permitted income calculation model of each voltage class of the provincial power grid based on a peak load responsibility method:
e1, calculating power transmission permission income B with voltage class hh，h＝1,2,…，5
Figure FDA00023326696100000215
In the formula (I), the compound is shown in the specification,
Figure FDA0002332669610000031
revenue is granted for the line for voltage class h;
Figure FDA0002332669610000032
allowable revenue for transformation of voltage class k αk/hThe power supply proportion of the voltage class k transformer is occupied when the upper-level voltage class k supplies power to the voltage class h;
Figure FDA0002332669610000033
the method comprises the following steps of (1) sharing the transformation permission income of a voltage class k when a superior voltage class k power grid supplies power to a voltage class h power grid;
Figure FDA0002332669610000034
allowable revenue for transformation of voltage class h αm/hThe power supply proportion of the transformer of the voltage class h is occupied when the lower-level voltage class m supplies power to the voltage class h;
Figure FDA0002332669610000035
the power transformation permission income of the voltage class h is shared when the lower-level voltage class m supplies power to the voltage class h;
e2, calculating the total permitted income E of the voltage class h which needs to be recovered through the power transmission and distribution priceh，h＝1,2,…，5
Figure FDA0002332669610000036
In the formula, EkIs a voltage class of kTotal revenue permitted for excess delivery and distribution price recovery, βk/hIs the power supply rate from voltage level k to voltage level h,
Figure FDA0002332669610000037
the total permitted revenue of the other voltage levels apportioned for voltage level h;
f. calculating power transmission and distribution cost pri with provincial power grid voltage class of h based on postage stamp methodh
Figure FDA0002332669610000038
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