Method and system for calculating average distribution and transformation capacity of rural power grid households for power system

Abstract

The present invention discloses a method for calculating the average household distribution and transformation capacity of a rural power grid for an electric power system, comprising obtaining data information of a target electric power system; calculating the average household distribution and transformation capacity of a rural power grid that meets conventional load requirements; calculating the average household distribution and transformation capacity of a rural power grid that meets charging requirements; calculating the average household distribution and transformation capacity of a rural power grid that meets power supply requirements; calculating the average household distributed photovoltaic distribution and transformation capacity in a planned year; and completing the calculation of the average household distribution and transformation capacity of a rural power grid for a target electric power system based on the obtained data information. The present invention also discloses a system for implementing the method for calculating the average household distribution and transformation capacity of a rural power grid for an electric power system. By comprehensively considering conventional loads and charging demand loads, and verifying distributed photovoltaic access requirements, the present invention not only realizes the calculation of the average household distribution and transformation capacity of a rural power grid for an electric power system, but also has higher reliability and better accuracy.

Description

Technical Field

[0001] The present invention belongs to the field of electrical automation, and in particular relates to a method and system for calculating the average distribution and transformation capacity of rural power grid households for power systems. Background Art

[0002] With the development of economy and technology and the improvement of people's living standards, electricity has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring a stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] Accurate distribution transformer capacity forecasts can provide strong data support for the development and operation planning of power systems. In particular, calculating the average per-household distribution transformer capacity in rural distribution networks can significantly improve power supply reliability and operational safety. Therefore, calculating the average per-household distribution transformer capacity in rural distribution networks is of great significance.

[0004] Currently, traditional methods for calculating per-household distribution and transformation capacity in rural power distribution networks use the existing annual distribution and transformation capacity and the existing annual number of users to predict the planned annual distribution and transformation capacity based on the growth rate of conventional loads, and the planned annual number of users based on the population growth rate. These methods then calculate the planned annual per-household distribution and transformation capacity in rural power distribution networks. However, these traditional calculation methods only consider the growth demand of conventional loads and cannot meet the per-household distribution and transformation capacity requirements of rural power distribution networks with a high proportion of distributed photovoltaic and electric charging facilities. Therefore, these traditional methods for calculating per-household distribution and transformation capacity in rural power distribution networks are not adaptable to the current development requirements of the power system. Summary of the Invention

[0005] One of the objectives of the present invention is to provide a method for calculating the average distribution and transformation capacity of a rural power grid household for a power system with high reliability and good accuracy.

[0006] A second object of the present invention is to provide a system for implementing the method for calculating the average distribution and transformation capacity of rural power grid households for power systems.

[0007] The method for calculating the average distribution and transformation capacity per household in a rural power grid for a power system provided by the present invention comprises the following steps:

[0008] S1. Obtain data information of the target power system;

[0009] S2. Calculate the average distribution capacity of the rural grid per household to meet conventional load requirements based on the data information obtained in step S1;

[0010] S3. Calculate the average distribution capacity of the rural grid to meet charging needs based on the data information obtained in step S1;

[0011] S4. Based on the data information obtained in steps S2 and S3, the calculation of the average distribution capacity of the rural grid to meet the power supply needs is performed;

[0012] S5. Calculate the average annual distributed photovoltaic capacity per household according to the data obtained in step S1;

[0013] S6. Based on the data information obtained in steps S4 and S5, the calculation of the average distribution and transformation capacity per household in the rural power grid of the target power system is completed.

[0014] Step S2, based on the data information obtained in step S1, calculates the average distribution and transformation capacity per household in the rural power grid to meet the conventional load demand, and specifically includes the following steps:

[0015] The following formula is used to calculate the average distribution and transformation capacity AR2 per household in the rural power grid to meet the conventional load demand in the planning year:

[0016]

[0017] Where AB is the growth rate of 10 kV grid load; AC is the user growth rate; n is the number of years from the current year to the planned year; AR1 is the average household distribution and transformation capacity of the rural grid that meets conventional load in the current year, and AR1 = AR-a·BM1, AR is the average household distribution and transformation capacity of the rural grid in the target area in the current year, a is the load simultaneity factor, and BM1 is the average household capacity of charging facilities in the current year.

[0018] Step S3, based on the data information obtained in step S1, calculates the average distribution capacity per household in the rural power grid to meet the charging demand, and specifically includes the following steps:

[0019] The following formula is used to calculate the average rural grid distribution and transformation capacity AR3 required to meet charging demand in the planned year:

[0020]

[0021] Where BN is the predicted capacity of charging piles in the planning year; CN is the predicted number of users in the planning year.

[0022] The step S4, based on the data information obtained in steps S2 and S3, calculates the average distribution and transformation capacity per household in the rural grid to meet the power supply demand, specifically including the following steps:

[0023] The following formula is used to calculate the average distribution and transformation capacity AR4 per household in the rural grid to meet the power supply demand in the planning year:

[0024] AR4=AR2+a·AR3

[0025] Where a is the load simultaneity factor.

[0026] The step S5, based on the data information obtained in step S1, calculates the average distributed photovoltaic capacity per household in the planned year, specifically including the following steps:

[0027] The following formula is used to calculate the average annual distributed photovoltaic distribution capacity AR5 per household in the planned year:

[0028]

[0029] Where BG is the predicted distributed photovoltaic installed capacity in the planning year.

[0030] Step S6, based on the data information obtained in steps S4 and S5, completes the calculation of the average distribution and transformation capacity per household in the rural power grid of the target power system, specifically including the following steps:

[0031] The distributed photovoltaic reverse transmission and distribution load rate β is calculated using the following formula:

[0032]

[0033] Where b is the load absorption rate of distributed photovoltaic area;

[0034] Determine the load rate β of distributed photovoltaic reverse transmission and distribution:

[0035] If β is less than 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target power system is considered to be AR4;

[0036] If β≥80%, return to step S1 and recalculate.

[0037] The present invention also provides a system for implementing the method for calculating the average household distribution and transformation capacity of a rural power grid for an electric power system, comprising a data acquisition module, a conventional calculation module, a charging calculation module, a power supply calculation module, a photovoltaic calculation module and a capacity calculation module; the data acquisition module, the conventional calculation module, the charging calculation module, the power supply calculation module, the photovoltaic calculation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to acquire data information of a target power system and upload the data information to the conventional calculation module; the conventional calculation module is used to calculate the average household distribution and transformation capacity of a rural power grid that meets conventional load requirements based on the received data information, and upload the data information to the charging calculation module; the charging calculation module is used to calculate the average household distribution and transformation capacity of a rural power grid that meets charging requirements based on the received data information, and upload the data information to the power supply calculation module; the power supply calculation module is used to calculate the average household distribution and transformation capacity of a rural power grid that meets power supply requirements based on the received data information, and upload the data information to the photovoltaic calculation module; the photovoltaic calculation module is used to calculate the average household distributed photovoltaic distribution and transformation capacity in a planned year based on the acquired data information, and upload the data information to the capacity calculation module; the capacity calculation module is used to complete the calculation of the average household distribution and transformation capacity of a target power grid based on the received data information.

[0038] The method and system for calculating the average household distribution and transformation capacity of a rural power grid for a power system provided by the present invention not only realizes the calculation of the average household distribution and transformation capacity of a rural power grid for a power system by comprehensively considering conventional loads and charging demand loads and verifying the demand for distributed photovoltaic access to the grid, but also has higher reliability and better accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Schematic diagram of the process of the present invention.

[0040] Figure 2 Schematic diagram of the functional modules of the system of the present invention. DETAILED DESCRIPTION

[0041] like Figure 1 The method flow diagram of the present invention is shown as follows: The method for calculating the average distribution capacity per household in a rural power grid for a power system disclosed in the present invention comprises the following steps:

[0042] S1. Obtain data information of the target power system;

[0043] S2. Based on the data information obtained in step S1, the calculation of the average distribution capacity of the rural grid to meet the conventional load demand is performed; specifically comprising the following steps:

[0044] The following formula is used to calculate the average distribution and transformation capacity AR2 per household in the rural power grid to meet the conventional load demand in the planning year:

[0045]

[0046] Where AB is the 10 kV grid load growth rate; AC is the user growth rate; n is the number of years from the current year to the planned year; AR1 is the average per-household distribution transformer capacity of the rural grid that meets conventional load in the current year, and AR1 = AR-a·BM1, where AR is the average per-household distribution transformer capacity of the rural grid in the target area in the current year, a is the load simultaneity factor (preferably 0.5), and BM1 is the average per-household capacity of charging facilities in the current year.

[0047] S3. Calculate the average distribution capacity of the rural grid per household to meet charging needs based on the data information obtained in step S1; specifically, the following steps:

[0048] The following formula is used to calculate the average rural grid distribution and transformation capacity AR3 required to meet charging demand in the planned year:

[0049]

[0050] Where BN is the predicted charging pile capacity for the planning year; CN is the predicted number of users for the planning year;

[0051] S4. Based on the data information obtained in steps S2 and S3, the calculation of the average distribution capacity of the rural grid to meet the power supply needs is performed; specifically comprising the following steps:

[0052] The following formula is used to calculate the average distribution and transformation capacity AR4 per household in the rural grid to meet the power supply demand in the planning year:

[0053] AR4=AR2+a·AR3

[0054] Where a is the load simultaneity factor;

[0055] S5. Based on the data information obtained in step S1, calculate the average annual distributed photovoltaic distribution capacity per household in the planned year; specifically, the following steps are included:

[0056] The following formula is used to calculate the average annual distributed photovoltaic distribution capacity AR5 per household in the planned year:

[0057]

[0058] Where BG is the predicted distributed photovoltaic installed capacity in the planning year;

[0059] S6. Based on the data information obtained in steps S4 and S5, the calculation of the average distribution capacity of the rural grid per household of the target power system is completed; specifically comprising the following steps:

[0060] Considering the demand for distributed photovoltaic grid access, the average distribution transformer capacity of rural grid households is verified. The distributed photovoltaic reverse transmission distribution transformer load rate β is calculated using the following formula:

[0061]

[0062] Where b is the load absorption rate of distributed photovoltaic power station, and the preferred value is 20%;

[0063] Determine the load rate β of distributed photovoltaic reverse transmission and distribution:

[0064] If β is less than 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target power system is considered to be AR4;

[0065] If β≥80%, return to step S1 and recalculate.

[0066] The method of the present invention is further described below with reference to an embodiment:

[0067] Taking a certain region as the research object, the current average annual rural grid distribution and transformation capacity per household in this region is 2.48 kVA per household, and the current average annual charging facility capacity per household is 0.09 kVA per household. By the planning year, the 10 kV grid load growth rate is 7.5%, and the user growth rate is 3.8%. The projected annual charging pile capacity is 3824.5 MVA, the projected annual rural grid distributed photovoltaic installed capacity is 9800 MVA, and the projected annual user number is 25.1322 million. The current year is assumed to be 2023, and the planning year is 2025.

[0068] First, we calculate AR1 = AR-a·BM1 = 2.48-0.09*0.5 = 2.44kVA / household;

[0069] Then calculate

[0070] Next, we calculate

[0071] Further calculation yields AR4 = AR2 + a·AR3 = 2.62 + 0.5*0.15 = 2.7 kVA / household;

[0072] Finally calculated and

[0073] Make a judgment:

[0074] β=11.56%<80%, so the index value can meet the demand for distributed photovoltaic access to the grid. The planning area is adapted to the rural grid household distribution and transformation capacity planning index value of the power system is AR4, which is 2.7kVA / household.

[0075] like Figure 2The figure shows a functional module diagram of the system of the present invention: the system disclosed by the present invention for realizing the method for calculating the average distribution capacity of the rural power grid household for the power system includes a data acquisition module, a conventional calculation module, a charging calculation module, a power supply calculation module, a photovoltaic calculation module and a capacity calculation module; the data acquisition module, the conventional calculation module, the charging calculation module, the power supply calculation module, the photovoltaic calculation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to obtain data information of the target power system and upload the data information to the conventional calculation module; the conventional calculation module is used to calculate the average distribution capacity of the rural power grid household that meets the conventional load demand based on the received data information. The calculation module is used to calculate the average distribution and transformation capacity of the rural grid household that meets the charging demand based on the received data information, and upload the data information to the power supply calculation module; the power supply calculation module is used to calculate the average distribution and transformation capacity of the rural grid household that meets the power supply demand based on the received data information, and upload the data information to the photovoltaic calculation module; the photovoltaic calculation module is used to calculate the average distribution and transformation capacity of the distributed photovoltaic household in the planned year based on the acquired data information, and upload the data information to the capacity calculation module; the capacity calculation module is used to complete the calculation of the average distribution and transformation capacity of the rural grid household of the target power system based on the received data information.

Claims

1. A method for calculating the average distribution and transformation capacity per household in a rural power grid for a power system, comprising the following steps: S1. Obtain data information of the target power system; S2. Calculate the average distribution capacity of the rural grid per household to meet conventional load requirements based on the data information obtained in step S1; S3. Calculate the average distribution capacity of the rural grid to meet charging needs based on the data information obtained in step S1; S4. Based on the data information obtained in steps S2 and S3, the calculation of the average distribution capacity of the rural grid to meet the power supply needs is performed; S5. Calculate the average annual distributed photovoltaic capacity per household according to the data obtained in step S1; S6. Based on the data information obtained in steps S4 and S5, the calculation of the average household distribution and transformation capacity of the rural power grid of the target power system is completed; in specific implementation, the distributed photovoltaic reverse transmission distribution and transformation load rate β is calculated based on the average household distribution and transformation capacity of the rural power grid that meets the power supply demand and the average household distribution and transformation capacity of distributed photovoltaics in the planned year. If β is less than the preset threshold, the average household distribution and transformation capacity of the rural power grid of the target power system is calculated as the average household distribution and transformation capacity of the rural power grid that meets the power supply demand.

2. The method for calculating the average distribution capacity per household in a rural power grid for a power system according to claim 1 is characterized in that Step S2, based on the data information obtained in step S1, calculates the average distribution and transformation capacity per household in the rural power grid to meet the conventional load demand, and specifically includes the following steps: The following formula is used to calculate the average distribution and transformation capacity AR2 per household in the rural power grid to meet the conventional load demand in the planning year: Where AB is the growth rate of 10 kV grid load; AC is the user growth rate; n is the number of years from the current year to the planned year; AR1 is the average household distribution and transformation capacity of the rural grid that meets conventional load in the current year, and AR1 = AR-a·BM1, AR is the average household distribution and transformation capacity of the rural grid in the target area in the current year, a is the load simultaneity factor, and BM1 is the average household capacity of charging facilities in the current year.

3. The method for calculating the average distribution capacity per household in a rural power grid for a power system according to claim 2 is characterized in that Step S3, based on the data information obtained in step S1, calculates the average distribution capacity per household in the rural power grid to meet the charging demand, and specifically includes the following steps: The following formula is used to calculate the average rural grid distribution and transformation capacity AR3 required to meet charging demand in the planned year: Where BN is the predicted capacity of charging piles in the planning year; CN is the predicted number of users in the planning year.

4. The method for calculating the average distribution capacity per household in a rural power grid for a power system according to claim 3 is characterized in that The step S4, based on the data information obtained in steps S2 and S3, calculates the average distribution and transformation capacity per household in the rural grid to meet the power supply demand, specifically including the following steps: The following formula is used to calculate the average distribution and transformation capacity AR4 per household in the rural grid to meet the power supply demand in the planning year: AR4=AR2+a·AR3 Where a is the load simultaneity factor.

5. The method for calculating the average distribution capacity per household in a rural power grid for a power system according to claim 4 is characterized in that The step S5, based on the data information obtained in step S1, calculates the average distributed photovoltaic capacity per household in the planned year, specifically including the following steps: The following formula is used to calculate the average annual distributed photovoltaic distribution capacity AR5 per household in the planned year: Where BG is the predicted distributed photovoltaic installed capacity in the planning year.

6. The method for calculating the average distribution and transformation capacity per household in a rural power grid for a power system according to claim 5 is characterized in that Step S6, based on the data information obtained in steps S4 and S5, completes the calculation of the average distribution and transformation capacity per household in the rural power grid of the target power system, specifically including the following steps: The distributed photovoltaic reverse transmission and distribution load rate β is calculated using the following formula: Where b is the load absorption rate of distributed photovoltaic area; Determine the load rate β of distributed photovoltaic reverse transmission and distribution: If β is less than 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target power system is considered to be AR4; If β≥80%, return to step S1 and recalculate.

7. A system for implementing the method for calculating the average distribution and transformation capacity per household in a rural power grid for a power system according to any one of claims 1 to 6, characterized in that It includes a data acquisition module, a conventional calculation module, a charging calculation module, a power supply calculation module, a photovoltaic calculation module and a capacity calculation module; the data acquisition module, the conventional calculation module, the charging calculation module, the power supply calculation module, the photovoltaic calculation module and the capacity calculation module are connected in series in sequence; the data acquisition module is used to obtain data information of the target power system and upload the data information to the conventional calculation module; The conventional calculation module is used to calculate the per capita distribution and transformation capacity of the rural grid to meet the conventional load demand based on the received data information, and upload the data information to the charging calculation module; the charging calculation module is used to calculate the per capita distribution and transformation capacity of the rural grid to meet the charging demand based on the received data information, and upload the data information to the power supply calculation module; the power supply calculation module is used to calculate the per capita distribution and transformation capacity of the rural grid to meet the power supply demand based on the received data information, and upload the data information to the photovoltaic calculation module; Photovoltaic meter The calculation module is used to calculate the average distribution capacity of distributed photovoltaic households in the planned year based on the acquired data information. And upload the data information to the capacity calculation module; the capacity calculation module is used to, based on the received data information, Complete the calculation of the average distribution and transformation capacity per household in the rural power grid of the target power system.

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