Method and system for calculating household average distribution transformer capacity of rural power grid for novel power system

Abstract

The invention discloses a rural power grid per household distribution transformer capacity calculation method for a novel power system. The method comprises the following steps: acquiring data information of a target novel power system; calculating the rural power grid household average distribution transformer capacity meeting the conventional load requirement; calculating the per-household distribution transformer capacity of the rural power grid meeting the charging requirement; calculating the per-household distribution transformer capacity of the rural power grid meeting the power supply requirement; calculating the distributed photovoltaic household average distribution transformer capacity in a planning year; and completing the calculation of the rural power grid per household distribution transformer capacity of the target novel power system according to the obtained data information. The invention also discloses a system for realizing the rural power grid per household distribution transformer capacity calculation method for the novel power system. According to the method, the conventional load and the charging demand load are comprehensively considered, and the distributed photovoltaic networking access demand is checked, so that the calculation of the rural power grid per household distribution transformer capacity for a novel power system is realized, and the reliability and the accuracy are higher.

Description

Technical Field

[0001] The 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 a new type of power system. 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 the stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] Accurate distribution transformer capacity prediction results can provide strong data support for the formulation of power system development plans and operation plans. In particular, the calculation of the average distribution transformer capacity per household in the rural power distribution network can greatly improve the power supply reliability and operation safety of the rural power distribution network. Therefore, the calculation of the average distribution transformer capacity per household in the rural power distribution network is of great significance.

[0004] At present, the traditional calculation scheme for the average distribution capacity per household in the rural power grid of the distribution network adopts the method of predicting the annual distribution capacity according to the current annual distribution capacity and the current annual number of users, and predicting the annual distribution capacity according to the growth rate of conventional loads, and predicting the number of planned annual users according to the population growth rate, and then calculating the average distribution capacity per household in the planned year. However, this type of traditional calculation scheme only considers the growth demand of traditional loads, and cannot meet the requirements of the average distribution capacity per household in the rural power grid for the access of a high proportion of distributed photovoltaic and electric charging facilities. Therefore, this type of traditional calculation scheme for the average distribution capacity per household in the rural power grid cannot meet the development requirements of the current new power system. Summary of the invention

[0005] One of the purposes of the present invention is to provide a method for calculating the average distribution transformer capacity of rural power grid households for a new type of power system with high reliability and good accuracy.

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

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

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

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

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

[0011] S4. Calculate the average distribution capacity of the rural grid per household to meet the power supply needs based on the data information obtained in steps S2 and S3;

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

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

[0014] The step S2 of calculating the average distribution capacity per household in the rural power grid that meets the conventional load demand based on the data information obtained in the step S1 specifically includes the following steps:

[0015] The following formula is used to calculate the average distribution and transformation capacity AR2 of the rural power grid that meets 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 coefficient, and BM1 is the average household capacity of charging facilities in the current year.

[0018] The step S3 of calculating the average distribution capacity of the rural grid households that meets the charging demand based on the data information obtained in step S1 specifically includes the following steps:

[0019] The following formula is used to calculate the average rural grid distribution capacity AR3 that meets the 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, according to the data information obtained in step S2 and step S3, calculates the average distribution and transformation capacity of the rural grid that meets the power supply demand, and specifically includes the following steps:

[0023] The following formula is used to calculate the average distribution and transformation capacity AR4 of the rural grid that meets 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, according to the data information obtained in step S1, calculates the average distribution capacity of distributed photovoltaic households in the planned year, and specifically includes the following steps:

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

[0028]

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

[0030] The step S6, according to the data information obtained in step S4 and step S5, completes the calculation of the average distribution and transformation capacity of the rural grid household of the target new power system, which specifically includes 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 in this area;

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

[0035] If β < 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target new 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 distribution and transformation capacity of rural power grid households for the new 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 the target new power system, and upload the data information to the conventional calculation module; the conventional calculation module is used to calculate the average distribution and transformation capacity of rural power grid households that meets the conventional load demand according to the received data information, and upload the data information to the charging calculation module; the charging calculation module is used to calculate the average distribution and transformation capacity of rural power grid households that meets the charging demand according to 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 rural power grid households that meets the power supply demand according to 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 distributed photovoltaic households in the planned year according to 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 rural power grid households of the target new power system according to the received data information.

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

[0039] Figure 1 The figure is a schematic diagram of the method flow 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 method of the present invention is shown as follows: the method for calculating the average distribution capacity of rural power grid households for a new power system disclosed in the present invention comprises the following steps:

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

[0043] S2. According to the data information obtained in step S1, the calculation of the average distribution capacity of the rural grid household that meets 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 of the rural power grid that meets the conventional load demand in the planning year:

[0045]

[0046] 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 capacity of the rural grid that meets the conventional load in the current year, and AR1 = AR-a BM1, AR is the average value of the average household distribution 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 household capacity of charging facilities in the current year;

[0047] S3. Calculate the average distribution capacity of the rural grid that meets the charging demand based on the data information obtained in step S1; specifically include the following steps:

[0048] The following formula is used to calculate the average rural grid distribution capacity AR3 that meets the charging demand in the planned year:

[0049]

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

[0051] S4. According to the data information obtained in step S2 and step S3, the calculation of the average distribution capacity of the rural grid household that meets the power supply demand is performed; specifically comprising the following steps:

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

[0053] AR4=AR2+a·AR3

[0054] Where a is the load simultaneity factor;

[0055] S5. According to the data information obtained in step S1, the average distribution capacity of distributed photovoltaic households in the planned year is calculated; specifically, the following steps are included:

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

[0057]

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

[0059] S6. According to the data information obtained in step S4 and step S5, the calculation of the average distribution capacity of the rural grid per household of the target new power system is completed; specifically, the following steps are included:

[0060] Considering the demand for distributed photovoltaic access to the grid, the average distribution transformer capacity of rural grid households is verified, and 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 < 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target new 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 in conjunction with an embodiment:

[0067] Taking a certain region as the research object, the average annual distribution capacity of the rural power grid per household in the region is 2.48kVA / household, and the average annual capacity of charging facilities per household is 0.09kVA / household; by the planning year, the growth rate of 10kV network load is 7.5%, the user growth rate is 3.8%, the predicted annual charging pile capacity is 3824.5MVA, the predicted annual rural power grid distributed photovoltaic installed capacity is 9800MVA, and the predicted annual number of users is 25.1322 million households. Assume that the current year is 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] Then we can calculate AR4 = AR2 + a·AR3 = 2.62 + 0.5*0.15 = 2.7 kVA / household;

[0072] Finally calculated and

[0073]

[0074] Make a judgment:

[0075] β=11.56%<80%, so the index value can meet the demand for distributed photovoltaic access to the grid. The planning index value of the average distribution and transformation capacity of rural power grid households adapted to the new power system in the planning area is AR4, which is 2.7kVA / household.

[0076] like Figure 2The functional module diagram of the system of the present invention is shown as follows: the system disclosed in the present invention for realizing the method for calculating the average household distribution transformer capacity of the rural power grid for the new power system comprises 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 the target new power system and upload the data information to the conventional calculation module; the conventional calculation module is used to calculate the average household distribution transformer capacity of the rural power grid that meets the conventional load demand according to the received data information. The charging calculation module is used to calculate the average distribution and transformation capacity of rural power grid households that meets the charging demand according to 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 rural power grid households that meets the power supply demand according to 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 distributed photovoltaic households in the planned year according to 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 rural power grid households of the target new power system according to the received data information.

Claims

1. A method for calculating the average distribution and transformation capacity of rural power grid households for a new power system, comprising the following steps: S1. Obtain data information of the target new power system; S2. Calculate the average distribution capacity of the rural grid per household to meet the conventional load demand based on the data information obtained in step S1; S3. Calculate the average distribution capacity of the rural grid per household to meet the charging demand based on the data information obtained in step S1; S4. Calculate the average distribution capacity of the rural grid per household to meet the power supply needs based on the data information obtained in steps S2 and S3; S5. Calculate the average annual distributed photovoltaic capacity per household according to the data information obtained in step S1; S6. Based on the data information obtained in step S4 and step S5, the calculation of the average distribution and transformation capacity per household in the rural power grid of the target new power system is completed.

2. The method for calculating the average distribution capacity of rural power grid households for a new power system according to claim 1 is characterized in that The step S2 of calculating the average distribution capacity per household in the rural power grid that meets the conventional load demand based on the data information obtained in the step S1 specifically includes the following steps: The following formula is used to calculate the average distribution and transformation capacity AR2 of the rural power grid that meets 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 coefficient, and BM1 is the average household capacity of charging facilities in the current year.

3. The method for calculating the average distribution capacity of rural power grid households for a new power system according to claim 2 is characterized in that The step S3 of calculating the average distribution capacity of the rural grid households that meets the charging demand based on the data information obtained in step S1 specifically includes the following steps: The following formula is used to calculate the average rural grid distribution capacity AR3 that meets the 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 of rural power grid households for a new power system according to claim 3 is characterized in that The step S4, according to the data information obtained in step S2 and step S3, calculates the average distribution and transformation capacity of the rural grid that meets the power supply demand, and specifically includes the following steps: The following formula is used to calculate the average distribution and transformation capacity AR4 of the rural grid that meets 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 of rural power grid households for a new power system according to claim 4 is characterized in that The step S5, according to the data information obtained in step S1, calculates the average distribution capacity of distributed photovoltaic households in the planned year, and specifically includes the following steps: The following formula is used to calculate the planned annual average distributed photovoltaic distribution capacity AR5: Where BG is the predicted distributed photovoltaic installed capacity in the planning year.

6. The method for calculating the average distribution capacity of rural power grid households for a new power system according to claim 5 is characterized in that The step S6, according to the data information obtained in step S4 and step S5, completes the calculation of the average distribution and transformation capacity of the rural grid household of the target new power system, which specifically includes 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 in this area; Determine the load rate β of distributed photovoltaic reverse transmission and distribution: If β < 80%, the calculated average distribution transformer capacity per household in the rural power grid of the target new 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 capacity of rural power grid households for a new power system as claimed in 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 acquire data information of the target new power system and upload the data information to the conventional calculation module; The conventional calculation module is used to calculate the average distribution and transformation capacity of the rural grid households that meets 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 average distribution and transformation capacity of the rural grid households 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 households 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 household distribution and transformation capacity of distributed photovoltaics 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 household distribution and transformation capacity of the rural power grid of the target new power system based on the received data information.

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