Partition new energy consumption rate calculation method considering short-circuit ratio and grid constraint

Abstract

The invention discloses a partition new energy consumption rate calculation method considering short circuit ratio and grid constraint. The method comprises the following steps: 1, collecting system data of each regional power grid; 2, establishing an electrical simulation model of a regional power grid, and calculating a new energy multi-station short-circuit ratio level of each region and inter-region main section power transmission capacity; 3, calculating a new energy output upper limit of each region; 4, correcting the wind and light output characteristic curve of each region according to the new energy output upper limit of each region, and calculating the photovoltaic abandoned electric quantity and the wind power abandoned electric quantity generated by insufficient new energy multi-station short-circuit ratio; 5, calculating a year-round 8760 profit and loss result of each region through a time sequence simulation program by using the corrected wind and light output characteristic curve of each region; and 6, calculating the new energy consumption rates of the whole area and each subarea. The invention provides a partition new energy consumption rate calculation scheme considering the net rack constraint, is used for practically reflecting the profit and loss conditions of the whole and each partition, and provides a scientific basis for promoting the efficient consumption of new energy.

Description

Technical Field

[0001] The present invention relates to the field of new energy consumption technology, and in particular to a method for calculating a partitioned new energy consumption rate taking into account short-circuit ratio and grid constraints. Background Art

[0002] As the global energy mix shifts toward clean, low-carbon energy, the installed capacity of renewable energy sources, particularly wind and photovoltaic power, continues to expand. However, the inherent volatility and peak-shaving characteristics of renewable energy output pose significant challenges to the safe and stable operation of power systems. In areas with a high proportion of renewable energy access, weak grid structures and limited inter-regional transmission capacity are becoming increasingly prominent, leading to significant challenges in the absorption of renewable energy. According to relevant statistics, the curtailment of wind and solar power in some regions due to insufficient grid carrying capacity has severely hampered the efficient utilization of renewable energy, necessitating an urgent need for scientific assessment methods to support grid planning and operational optimization.

[0003] Current methods for assessing renewable energy absorption capacity often focus on a single station or the overall system level, resulting in two limitations: First, traditional short-circuit ratio analysis is often based on a single-station model, failing to consider the coupling effects of multiple station clusters on grid strength, resulting in inaccurate calculations of renewable energy output limits. Second, existing absorption rate calculations often ignore the dynamic constraints of inter-regional transmission capacity and estimate only using static capacity allocation, making it difficult to accurately reflect inter-regional power mutual assistance and congestion effects. Furthermore, existing methods lack a mechanism for coordinating the correction of renewable energy output curves and grid constraints, resulting in deviations between the results of curtailment quantification and actual conditions.

[0004] Therefore, how to establish a regional new energy absorption rate calculation method that takes into account the short-circuit ratio constraints of multiple stations and the dynamic limitations of section transmission capacity has become the key to improving the rationality of new energy planning and the economic efficiency of operation. Summary of the Invention

[0005] The present invention provides a method for calculating the partitioned new energy consumption rate taking into account the short-circuit ratio and grid constraints, so as to solve the technical problems mentioned in the background technology.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The present invention provides a method for calculating the partitioned new energy consumption rate taking into account short-circuit ratio and grid constraints, comprising the following steps:

[0008] S1. Collect system data of each regional power grid, including regional power grid planning, load forecast, load characteristic curve, and power output curve;

[0009] S2. Establish an electrical simulation model of the regional power grid. Based on the electrical simulation model and through power flow stability calculation, obtain the short-circuit ratio level of each regional renewable energy multi-station and the transmission capacity of the inter-regional interconnection section;

[0010] S3. Calculate the upper limit of renewable energy output in each region based on the calculated short-circuit ratio of renewable energy multi-stations in each region;

[0011] S4. Modify the wind and solar output characteristic curves for each region according to the upper limit of each region's renewable energy output. Calculate the amount of photovoltaic power and wind power curtailment caused by insufficient short-circuit ratios of renewable energy multi-stations using the modified wind and solar output characteristic curves for each region at all times throughout the year.

[0012] S5. Using the revised wind power and photovoltaic output characteristic curves of each region and combining them with the system data in S1, calculate the profit and loss results of each region for the entire year 8760 through a time series simulation program;

[0013] S6. Calculate the new energy consumption rate for the entire region and each sub-region based on the transmission capacity of the interconnected sections between regions and the profit and loss results of 8760 in each region throughout the year.

[0014] Beneficial effects of the present invention:

[0015] 1. The present invention provides a method for calculating the partitioned renewable energy absorption rate taking into account the short-circuit ratio and grid constraints. By calculating the short-circuit ratio of multiple renewable energy stations and comprehensively considering the impact of the access of renewable energy station clusters on the grid strength, it breaks through the limitations of traditional single-station short-circuit ratio assessment, significantly improves the calculation accuracy of the renewable energy output upper limit, and provides a more reliable constraint boundary for the safe operation of the power grid.

[0016] 2. This invention calculates the transmission capacity of major sections between regions based on tidal stability, and incorporates the section transmission limit into the calculation boundary of the absorption rate, effectively avoiding the overestimation of cross-regional absorption capacity by traditional static capacity allocation methods, and truly reflects the restrictions of grid constraints on the absorption of new energy.

[0017] 3. This invention modifies the wind and solar output curve by incorporating multi-station short-circuit ratio constraints, accurately quantifying the amount of power curtailment caused by insufficient short-circuit ratios. This distinguishes between power source-side curtailment and grid-side curtailment, providing data support for optimizing renewable energy scheduling strategies and exploring potential energy consumption. The multi-station short-circuit ratio constraint refers to the upper limit of renewable energy output calculated from the short-circuit ratios of multiple renewable energy stations.

[0018] 4. By calculating the new energy absorption rate by region and superimposing grid constraints, the present invention can clearly identify the absorption bottlenecks of each region and the potential for cross-regional mutual assistance, providing scientific guidance for grid planning, energy storage configuration and cross-regional transmission channel expansion, and promoting the efficient absorption of new energy on a larger scale.

[0019] 5. Based on the deep integration of timing simulation and grid constraints, the present invention can simulate the spatiotemporal distribution characteristics of new energy consumption under different scenarios, providing a scientific basis for formulating differentiated regional new energy development policies and optimizing the timing and operation mode of grid investment, and can help achieve the coordinated development of new energy and grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the method for calculating the new energy consumption rate in the present invention;

[0021] Figure 2 This is a flow chart of S61 in the present invention. DETAILED DESCRIPTION

[0022] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many other forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0023] Reference Figure 1 The embodiment of the present application provides a method for calculating the partitioned new energy consumption rate taking into account the short-circuit ratio and grid constraints, including the following steps:

[0024] S1. Collect system data of each regional power grid, including regional power grid planning, load forecast, load characteristic curve, and power output curve;

[0025] S2. Establish an electrical simulation model of the regional power grid. Based on the electrical simulation model and through power flow stability calculation, obtain the short-circuit ratio level of each regional renewable energy multi-station and the transmission capacity of the inter-regional interconnection section;

[0026] S3. Calculate the upper limit of renewable energy output in each region based on the calculated short-circuit ratio of renewable energy multi-stations in each region;

[0027] S4. Modify the wind and solar output characteristic curves for each region according to the upper limit of each region's renewable energy output. Calculate the amount of photovoltaic power and wind power curtailment caused by insufficient short-circuit ratios of renewable energy multi-stations using the modified wind and solar output characteristic curves for each region at all times throughout the year.

[0028] S5. Using the revised wind power and photovoltaic output characteristic curves of each region and combining them with the system data in S1, calculate the profit and loss results of each region for the entire year 8760 through a time series simulation program;

[0029] S6. Calculate the new energy consumption rate for the entire region and each sub-region based on the transmission capacity of the interconnected sections between regions and the profit and loss results of 8760 in each region throughout the year.

[0030] The present invention provides a method for calculating the partitioned renewable energy absorption rate taking into account the short-circuit ratio and grid constraints. By calculating the short-circuit ratio of multiple renewable energy stations and comprehensively considering the impact of the access of renewable energy station clusters on the grid strength, it breaks through the limitations of traditional single-station short-circuit ratio assessment, significantly improves the calculation accuracy of the renewable energy output upper limit, and provides a more reliable constraint boundary for the safe operation of the power grid.

[0031] In some embodiments, S3 specifically includes the following steps:

[0032] S31. Based on the clear power grid planning, calculate the short-circuit ratio level of multiple renewable energy stations in each region when wind and solar power are operating normally;

[0033] S32. Continuously reduce the output of renewable energy in each region to increase the short-circuit ratio of renewable energy in each region until the short-circuit ratio of renewable energy multi-stations in each region satisfies the requirement that the short-circuit ratio at the machine end is greater than 1.5 and the short-circuit ratio at the grid connection point is greater than 2.0. At this time, the restricted photovoltaic output coefficient k of the i-th region is obtained. p (i) and the limited wind power output coefficient k w (i);

[0034] S33, based on the restricted photovoltaic output coefficient k of the i-th region p (i) and the limited wind power output coefficient k w (i) Construct the upper limit expression of renewable energy output in the i-th region, specifically:

[0035] P L (i) = S p (i)×k p (i)+S w (i)×k w (i)

[0036] Among them, P L (i) represents the upper limit of renewable energy output in the i-th region, S p (i) represents the photovoltaic installed capacity of the i-th region, S w (i) represents the installed capacity of wind power in the i-th region;

[0037] S34. Calculate the upper limit of new energy output for each region based on the upper limit expression of new energy output for the i-th region.

[0038] In some embodiments, the S4 specifically includes the following steps:

[0039] S41. Based on the wind and solar power output characteristic curves and wind and solar power installed capacity of each region obtained in S1, calculate the new energy output of each region, and compare it with the upper limit of new energy output of the same region to obtain the corrected new energy output of each region at each time throughout the year;

[0040] S42. Based on the wind and solar power outputs of each region at each time before correction, allocate the corrected new energy outputs of each region at each time throughout the year according to the wind and solar power output ratio, and obtain the corrected wind power output and photovoltaic output of each region at each time throughout the year;

[0041] S43. Based on the wind and solar output characteristic curves of each region obtained in S1, and according to the revised wind power output and photovoltaic output of each region at each time throughout the year, a revised wind and solar output size curve of each region at each time throughout the year is constructed:

[0042] S44, dividing the value at each moment in the modified wind power and photovoltaic output curves of each region at each moment throughout the year by the corresponding wind power and photovoltaic installed capacity to obtain a modified wind power and photovoltaic output characteristic curve for each region at each moment throughout the year;

[0043] S45. Calculating the difference in wind power output before and after the correction for each region based on the wind power output before and after the correction at each time throughout the year; and calculating the difference in photovoltaic output before and after the correction for each region based on the photovoltaic output before and after the correction at each time throughout the year;

[0044] S46. Calculate the photovoltaic power curtailment E caused by insufficient short-circuit ratio of multiple new energy stations based on the wind power output difference and photovoltaic output difference before and after correction in each region. p-M (i) and wind power curtailment E w-M (i).

[0045] In some embodiments, the S41 specifically includes the following steps:

[0046] S411. Based on the wind and solar power output characteristic curve of the i-th region obtained in S1 and the wind and solar power installed capacity of the i-th region, calculate the new energy output of the i-th region at each moment;

[0047] S412, the new energy output P at the jth moment j (i) and the upper limit of renewable energy output P in the region L (i) Compare the two values and take the smaller value as the corrected new energy output P at the jth moment R，j (i);

[0048] S413, loop S412, after 8760 comparisons, obtain the revised new energy output of the i-th region at each time throughout the year;

[0049] S414. Repeat S411 to S413 until the corrected new energy output of each region at each time throughout the year is obtained.

[0050] In some embodiments, the S42 specifically includes the following steps:

[0051] S421, based on the photovoltaic output P of the i-th region at the j-th moment before correction p，j (i) Wind power output P of the i-th region at the j-th moment before correction w，j (i) The corrected new energy output P of the i-th region at the j-th moment R，j (i) Calculate the corrected photovoltaic output P of the i-th region at the j-th moment p-R，j (i), the calculation formula is as follows:

[0052]

[0053] S422, based on the photovoltaic output P of the i-th region at the j-th moment before correction p，j (i) Wind power output P of the i-th region at the j-th moment before correction w，j (i) The corrected new energy output P of the i-th region at the j-th moment R，j (i) Calculate the corrected wind power output P in the i-th region at the j-th moment w x R，j (i), the calculation formula is as follows:

[0054]

[0055] S423, looping S421 to S422, after 8760 cycles, obtaining the corrected photovoltaic output of the i-th region at each time throughout the year and the corrected wind power output of the i-th region at each time throughout the year;

[0056] S424, loop S421 to S423 until the corrected photovoltaic output of each region at each time throughout the year and the corrected wind power output of each region at each time throughout the year are obtained.

[0057] In some embodiments, the photovoltaic power loss E generated by insufficient short-circuit ratio of multiple new energy stations in S46 is p-M (i) and wind power curtailment E w-M (i) The expressions are:

[0058]

[0059] In some embodiments, the step S6 specifically includes the following steps:

[0060] S61, dividing the power grid terminal area and the power grid center area;

[0061] The area within a planning area that is connected to only one area and has no area connected to it in the adjacent planning area is defined as the grid end area, and the other areas except the grid end area are defined as the grid center area;

[0062] S62. Based on the annual 8760 profit and loss results of each region in S5 and the transmission capacity of the inter-regional interconnection sections in S2, calculate the amount of power abandoned in the terminal area of the power grid due to the limited transmission capacity of the section;

[0063] S63. Based on the profit and loss results of each region for the entire year (8760) in S5 and the transmission capacity of the inter-regional interconnection sections in S2, calculate the amount of power abandoned in the central area connected to the end area of the power grid due to the limited transmission capacity of the section;

[0064] S64, looping S62 to S63 until the calculation reaches the last level of the adjacent area, and obtaining the total amount of power abandonment in the entire area due to the limited transmission capacity of the regional intersection;

[0065] S65. Based on the power exchange between the current region and the next region and the total power curtailment in the region due to the limited transmission capacity of the regional sections, and according to the order of curtailment of hydropower, wind power, and solar power in actual grid operation, calculate the curtailment of hydropower, wind power, and solar power in each region;

[0066] S66. Combined with the amount of wasted electricity due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4 and the amount of wasted electricity of hydropower, wind power and solar power in each region, the new energy absorption rate of the entire region and each sub-region is calculated.

[0067] In some embodiments, reference Figure 2 , the S62 specifically includes the following steps:

[0068] S621, first determine the timing simulation result P of the power grid end area at the jth moment j (1) Is it greater than 0? If so, proceed to S622; otherwise, proceed to S624.

[0069] S622, the timing simulation result P of the power grid terminal area at the jth moment j (1) Assign the power surplus P to the end area of the power grid at the jth moment j+ (1), judge P j+ (1)>P 1-3 Is it satisfied? 1-3 It represents the transmission capacity of the three-phase connection section of the power grid terminal area 1, the power grid terminal area 2 and the power grid center area, where the power grid center area 3 is connected to the power grid area 1 and the power grid terminal area 2; if it satisfies, then P r，j+ (1) = P 1-3 , P r，j+ (1) represents the power surplus of the grid terminal area at the jth moment after considering the grid constraints, otherwise P r，j+ (1) = P r，j (1); where P r，j(1) is the timing simulation result after considering the grid constraint at the end area of the power grid at the jth moment; the grid constraint is the constraint caused by the limited transmission capacity of the interconnection section between regions;

[0070] S623. Calculate the amount of power abandoned due to the limited transmission capacity of the section in the end area of the power grid. The calculation formula is as follows:

[0071]

[0072] Among them, Q q It indicates the amount of power wasted in the end area of the power grid due to the limited transmission capacity of the section;

[0073] S624, the timing simulation result P of the power grid terminal area at the jth moment j (1) Assign the power deficit P at the end area of the power grid at the jth moment j- (1), judge |P j- (1)|>P 1-3 Is it satisfied? If so, then P r，j- (1) = -P 1-3 , otherwise P r,j- (1) = P j- (1);

[0074] S625. Use the same steps as S621 to S624 to calculate the amount of abandoned electricity in the second end area of the power grid and due to the limited transmission capacity of the section.

[0075] In some embodiments, the S63 specifically includes the following steps:

[0076] S631. First, calculate the power exchange between the central area of the power grid and all adjacent power grid areas, and calculate the power profit and loss of the central area of the power grid after taking into account the power exchange between the central area of the power grid and all adjacent power grid areas.

[0077] S632. Based on the power profit and loss results of the central area of the power grid after considering the power exchange with all adjacent power grid areas, and the cross-section transmission capacity of the current central area of the power grid and the next-level area, the same steps as S621 to S624 are used to calculate the amount of power abandonment caused by the limited cross-section transmission capacity in the current central area of the power grid.

[0078] This implementation uses the grid center area 3 as an example, where the grid center area 3 is connected to the grid end area 1 and the grid end area 2 respectively. The calculation process is as follows:

[0079] Step a (corresponding to S631) calculates the power profit and loss of the grid center area 3 after considering the power exchange between the grid end area 1, the grid end area 2, and the grid center area 3, and uses the formula as follows:

[0080] P J (3) = P j (3)+P r,j (1)+P r，j (2)

[0081] Among them, P J (3) represents the power profit and loss result of the grid center area 3 after considering the power exchange between the grid end area 1 and the grid end area 2; P j (3) represents the timing simulation result of the central area of the power grid at time j; P r，j (2) represents the timing simulation results at the second jth moment in the power grid terminal area;

[0082] Step b (corresponding to S632), the power profit and loss result P after considering the power exchange between the power grid center area 3 and the power grid end area 1 and the power grid end area 2 J (3) The transmission capacity of the sections of the central area 3 and the next level area of the power grid is calculated, and the same steps from S621 to S624 are used to calculate the amount of power abandoned due to the limited transmission capacity of the sections in the central area 3.

[0083] In addition, this implementation uses the example of grid center area 4. Grid center area 4 is connected to grid end area 5 and grid end area 6 on one side, and to grid center area 3 on the other side. In this case, the calculation process of the power curtailment caused by the limited cross-section transmission capacity of grid center area 4 is as follows:

[0084] Step a (corresponding to S631) is to first calculate the power profit and loss of the grid center area 4 after considering the power exchange between the grid end area 5, the grid end area 6, the grid center area 3, and the grid center area 4, and the power exchange between the grid end area 1, the grid end area 2, and the grid center area 3.

[0085] Step b (corresponding to S632) is to calculate the amount of power wasted in the central area 4 due to the limited cross-section transmission capacity based on the power profit and loss results after considering the power exchange between the central area 4 and the grid end area 5, the grid end area 6, and the central area 3, and the cross-section transmission capacity between the central area 4 and the next level area. The same steps as S621 to S624 are used to calculate the amount of power wasted in the central area 4 due to the limited cross-section transmission capacity.

[0086] In some embodiments, the S66 specifically includes the following steps:

[0087] S661. Combined with the amount of power curtailment due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4, calculate the hydropower curtailment rate in the i-th region. The expression is:

[0088]

[0089] Among them, E h-L (i) represents the amount of hydropower curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E h (i) represents the total hydropower generation in the i-th region;

[0090] S662, loop S661 multiple times until the hydropower curtailment rate of each region is obtained, and then calculate the hydropower curtailment rate Q of the entire region based on the hydropower curtailment rate of each region. h , the expression is:

[0091]

[0092] Where n represents the total number of regions;

[0093] S663. Combined with the amount of power curtailment due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4, calculate the photovoltaic power curtailment rate in the i-th region. The expression is:

[0094]

[0095] Among them, E p-L (i) represents the amount of photovoltaic power curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E p-M (i) represents the amount of photovoltaic power curtailment in the i-th region due to insufficient short-circuit ratio of multiple renewable energy stations, E p (i) represents the total photovoltaic power generation in the i-th region;

[0096] S664, loop S663 until the photovoltaic power curtailment rate of each area is obtained, and then calculate the photovoltaic power curtailment rate Q of the entire area based on the photovoltaic power curtailment rate of each area. p , the expression is:

[0097]

[0098] S665. Combined with the amount of curtailment due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4, calculate the wind power curtailment rate in the i-th region. The expression is:

[0099]

[0100] Among them, E w-L (i) represents the amount of wind power curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E w-M(i) represents the amount of wind power curtailment in the i-th region due to insufficient short-circuit ratio of multiple renewable energy stations, E w (i) represents the total wind power generation in the i-th region;

[0101] S666, loop S665 until the wind power curtailment rate of each region is obtained, and then calculate the wind power curtailment rate Q of the entire region based on the wind power curtailment rate of each region. w , the expression is:

[0102]

[0103] S667, based on the hydropower curtailment rate Q for the whole region and each sub-region h , photovoltaic power curtailment rate Q p And the wind power curtailment rate Q w Calculate the new energy consumption rate for the entire district and each sub-district.

[0104] For ease of understanding, the following examples are given:

[0105] Taking a provincial power grid as an example, the terminal area of the grid has 15MW of installed hydropower, 150MW of installed wind power, and 350MW of installed photovoltaic power. The power generation of hydropower, wind power, and photovoltaic power, respectively, is 48 million kWh, 325 million kWh, and 595 million kWh. According to S2 calculations, the power flow stability limit of the interconnection section with adjacent areas is 150MW. According to S3 calculations, to meet the national standard for the short-circuit ratio of multiple renewable energy stations in this area, the output of photovoltaic power and wind power must be controlled at or below 0.35 and 0.2, respectively. The calculated upper limit of renewable energy output in this area is 350×0.35+150×0.2=152.5MW.

[0106] According to the steps described in S4, the wind and solar output characteristic curve is corrected with the upper limit of new energy output of 152.5MW, and it is calculated that the power supply side power curtailment caused by insufficient short-circuit ratio of multiple stations in this area is 187 million kWh, of which photovoltaic and wind power curtailment are 158 million kWh and 29 million kWh respectively.

[0107] Following the steps in S5, the timing simulation results for each zone were calculated. Following the steps in S6, the amount of power curtailed due to the limited transmission capacity of the interconnection section with the adjacent area was calculated to be 50 million kWh. Assuming the principle of curtailing hydropower first and then wind and solar power, the amount of power curtailed was calculated to be 20 million kWh for hydropower, 20 million kWh for wind power, and 10 million kWh for solar power, respectively.

[0108] Therefore, based on the above, it can be calculated that the water, wind and solar power curtailment rates in this region are 4.17%, 9.54% and 26.7% respectively. The overall curtailment rate of clean energy (water, wind and solar) in this region is 19.8%, and the new energy (wind and solar) consumption rate is 79.4%.

[0109] To increase the region's renewable energy consumption rate, the following recommendations are based on this disclosure: ① Focusing on increasing the short-circuit ratio of multiple renewable energy stations and raising the upper limit of regional renewable energy output, measures such as deploying grid-forming equipment and optimizing renewable energy access methods should be adopted. ② Focusing on improving the regional inter-section transmission capacity, measures such as strengthening the grid should be adopted.

[0110] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints, characterized in that: The steps include: S1. Collect system data of each regional power grid, including regional power grid planning, load forecast, load characteristic curve, and power output curve; S2. Establish an electrical simulation model of the regional power grid. Based on the electrical simulation model and through power flow stability calculation, obtain the short-circuit ratio level of each regional renewable energy multi-station and the transmission capacity of the inter-regional interconnection section; S3. Calculate the upper limit of renewable energy output in each region based on the calculated short-circuit ratio of renewable energy multi-stations in each region; S4. Modify the wind and solar output characteristic curves for each region according to the upper limit of each region's renewable energy output. Calculate the amount of photovoltaic power and wind power curtailment caused by insufficient short-circuit ratios of renewable energy multi-stations using the modified wind and solar output characteristic curves for each region at all times throughout the year. S5. Using the revised wind power and photovoltaic output characteristic curves of each region and combining them with the system data in S1, calculate the profit and loss results of each region for the entire year 8760 through a time series simulation program; S6. Calculate the new energy consumption rate of the entire region and each sub-region based on the transmission capacity of the inter-regional interconnection sections and the profit and loss results of each region throughout the year 8760.

2. The method for calculating the partitioned new energy consumption rate considering short-circuit ratio and grid constraints according to claim 1 is characterized in that: The S3 specifically includes the following steps: S31. Based on the clear power grid planning, calculate the short-circuit ratio level of multiple renewable energy stations in each region when wind and solar power are operating normally; S32. Continuously reduce the output of renewable energy in each region to increase the short-circuit ratio of renewable energy in each region until the short-circuit ratio of renewable energy multi-stations in each region satisfies the requirement that the short-circuit ratio at the machine end is greater than 1.5 and the short-circuit ratio at the grid connection point is greater than 2.

0. At this time, the restricted photovoltaic output coefficient k of the i-th region is obtained. p (i) and the limited wind power output coefficient k w (i); S33, based on the restricted photovoltaic output coefficient k of the i-th region p (i) and the limited wind power output coefficient k w (i) Construct the upper limit expression of renewable energy output in the i-th region, specifically: P L (i)=S p (i)×k p (i)+S w (i)×k w (i) Among them, P L (i) represents the upper limit of renewable energy output in the i-th region, S p (i) represents the photovoltaic installed capacity of the i-th region, S w (i) represents the installed capacity of wind power in the i-th region; S34. Calculate the upper limit of new energy output for each region based on the upper limit expression of new energy output for the i-th region.

3. The method for calculating the partitioned new energy consumption rate considering short-circuit ratio and grid constraints according to claim 2 is characterized in that: The S4 specifically includes the following steps: S41. Based on the wind and solar power output characteristic curves and wind and solar power installed capacity of each region obtained in S1, calculate the new energy output of each region, and compare it with the upper limit of new energy output of the same region to obtain the corrected new energy output of each region at each time throughout the year; S42. Based on the wind and solar power outputs of each region at each time before correction, allocate the corrected new energy outputs of each region at each time throughout the year according to the wind and solar power output ratio, and obtain the corrected wind power output and photovoltaic output of each region at each time throughout the year; S43. Based on the wind and solar output characteristic curves of each region obtained in S1, and according to the revised wind power output and photovoltaic output of each region at each time throughout the year, construct a revised wind and solar output size curve for each region at each time throughout the year; S44, dividing the values at each moment in the modified wind power and photovoltaic output curves of each region at each moment throughout the year by the corresponding wind power and photovoltaic installed capacity to obtain the modified wind and photovoltaic output characteristic curves of each region at each moment throughout the year; S45. Calculating the difference in wind power output before and after the correction for each region based on the wind power output before and after the correction at each time throughout the year; and calculating the difference in photovoltaic output before and after the correction for each region based on the photovoltaic output before and after the correction at each time throughout the year; S46. Calculate the photovoltaic power curtailment E caused by insufficient short-circuit ratio of multiple new energy stations based on the wind power output difference and photovoltaic output difference before and after correction in each region. p-M (i) and wind power curtailment E w-M (i).

4. The method for calculating the partitioned new energy consumption rate considering short-circuit ratio and grid constraints according to claim 3 is characterized in that: The S41 specifically includes the following steps: S411. Based on the wind and solar power output characteristic curve of the i-th region obtained in S1 and the wind and solar power installed capacity of the i-th region, calculate the new energy output of the i-th region at each moment; S412, the new energy output P at the jth moment j (i) and the upper limit of renewable energy output P in the region L (i) Compare the two values and take the smaller value as the corrected new energy output P at the jth moment R，j (i); S413, loop S412, after 8760 comparisons, obtain the revised new energy output of the i-th region at each time throughout the year; S414. Repeat S411 to S413 until the corrected new energy output of each region at each time throughout the year is obtained.

5. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 3 is characterized in that: The S42 specifically includes the following steps: S421, based on the photovoltaic output P of the i-th region at the j-th moment before correction p，j (i) Wind power output P of the i-th region at the j-th moment before correction w，j (i) The corrected new energy output P of the i-th region at the j-th moment R，j (i) Calculate the corrected photovoltaic output P of the i-th region at the j-th moment p-R，j (i), the calculation formula is as follows: S422, based on the photovoltaic output P of the i-th region at the j-th moment before correction p，j (i) Wind power output P of the i-th region at the j-th moment before correction w，j (i) The corrected new energy output P of the i-th region at the j-th moment R，j (i) Calculate the corrected wind power output P in the i-th region at the j-th moment w-R，j (i), the calculation formula is as follows: S423, loop S421 to S422, after 8760 cycles, obtain the corrected photovoltaic output of the i-th region at each time throughout the year and the corrected wind power output of the i-th region at each time throughout the year; S424, loop S421 to S423 until the corrected photovoltaic output of each region at each time throughout the year and the corrected wind power output of each region at each time throughout the year are obtained.

6. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 5 is characterized in that: The photovoltaic power loss E caused by insufficient short-circuit ratio of multiple new energy stations in S46 p-M (i) and wind power curtailment E w-M (i) The expressions are:

7. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 6 is characterized in that: The S6 specifically includes the following steps: S61. Divide the power grid terminal area and the power grid center area; The area within a planning area that is connected to only one area and has no area connected to it in the adjacent planning area is defined as the grid terminal area. The areas other than the grid terminal area are defined as the grid center area. S62. Based on the annual 8760 profit and loss results of each region in S5 and the transmission capacity of the inter-regional interconnection sections in S2, calculate the amount of power abandoned in the terminal area of the power grid due to the limited transmission capacity of the section; S63. Based on the profit and loss results of each region for the entire year (8760) in S5 and the transmission capacity of the inter-regional interconnection sections in S2, calculate the amount of power abandoned in the central area connected to the end area of the power grid due to the limited transmission capacity of the section; S64, looping S62 to S63 until the calculation reaches the last level of the adjacent area, and obtaining the total amount of power abandonment in the entire area due to the limited transmission capacity of the regional intersection; S65. Based on the power exchange between the current region and the next region and the total power curtailment in the region due to the limited transmission capacity of the regional sections, and according to the order of curtailment of hydropower, wind power, and solar power in actual grid operation, calculate the curtailment of hydropower, wind power, and solar power in each region; S66. Combined with the amount of wasted electricity due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4 and the amount of wasted electricity of hydropower, wind power and solar power in each region, the new energy absorption rate of the entire region and each sub-region is calculated.

8. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 7 is characterized in that: The S61 specifically includes the following steps: S621, first determine the timing simulation result P of the power grid end area at the jth moment j (1) Is it greater than 0? If so, proceed to S622; otherwise, proceed to S624. S622, the timing simulation result P of the power grid terminal area at the jth moment j (1) Assign the power surplus P to the end area of the power grid at the jth moment j+ (1), judge P j+ (1)>P 1-3 Is it satisfied? 1-3 It represents the transmission capacity of the three-phase connection section of the power grid terminal area 1, the power grid terminal area 2 and the power grid center area, where the power grid center area 3 is connected to the power grid area 1 and the power grid terminal area 2; if it satisfies, then P r，j+ (1) = P 1-3 , P r，j+ (1) represents the power surplus of the grid terminal area at the jth moment after considering the grid structure constraint, otherwise P r，j+ (1) = P r，j (1); where P r，j (1) is the timing simulation result after considering the grid constraint at the end area of the power grid at the jth moment; the grid constraint is the constraint caused by the limited transmission capacity of the interconnection section between regions; S623. Calculate the amount of power abandoned due to the limited transmission capacity of the section in the end area of the power grid. The calculation formula is as follows: Among them, Q q It indicates the amount of power wasted in the end area of the power grid due to the limited transmission capacity of the section; S624, the timing simulation result P of the power grid terminal area at the jth moment j (1) Assign the power deficit P at the end area of the power grid at the jth moment j- (1), judge |P j- (1)|>P 1-3 Is it satisfied? If so, then P r，j- (1) = -P 1-3 , otherwise P r，j- (1) = P j- (1); S625. Calculate the amount of power wasted in the second end area of the power grid due to the limited transmission capacity of the section using the same steps as S621 to S624.

9. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 8 is characterized in that: The S63 specifically includes the following steps: S631. First, calculate the power exchange between the central area of the power grid and all adjacent power grid areas, and calculate the power profit and loss of the central area of the power grid after taking into account the power exchange between the central area of the power grid and all adjacent power grid areas. S632. Based on the power profit and loss results of the central area of the power grid after considering the power exchange with all adjacent power grid areas, and the cross-section transmission capacity of the current central area of the power grid and the next-level area, the same steps as S621 to S624 are used to calculate the amount of power abandonment caused by the limited cross-section transmission capacity in the current central area of the power grid.

10. The method for calculating the regional new energy consumption rate considering short-circuit ratio and grid constraints according to claim 9 is characterized in that: The S66 specifically includes the following steps: S661. Calculate the hydropower curtailment rate in the i-th region. The expression is: Among them, E h-L (i) represents the amount of hydropower curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E h (i) represents the total hydropower generation in the i-th region; S662, loop S661 multiple times until the hydropower curtailment rate of each region is obtained, and then calculate the hydropower curtailment rate Q of the entire region based on the hydropower curtailment rate of each region. h , the expression is: Where n represents the total number of regions; S663. Combined with the amount of power curtailment due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4, calculate the photovoltaic power curtailment rate in the i-th region. The expression is: Among them, E p-L (i) represents the amount of photovoltaic power curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E p-M (i) represents the amount of photovoltaic power curtailment in the i-th region due to insufficient short-circuit ratio of multiple renewable energy stations, E p (i) represents the total photovoltaic power generation in the i-th region; S664, loop S663 until the photovoltaic power curtailment rate of each area is obtained, and then calculate the photovoltaic power curtailment rate Q of the entire area based on the photovoltaic power curtailment rate of each area. p , the expression is: S665. Combined with the amount of curtailment due to insufficient short-circuit ratio of multiple renewable energy stations obtained in S4, calculate the wind power curtailment rate in the i-th region. The expression is: Among them, E w-L (i) represents the amount of wind power curtailment in the i-th region due to the limited transmission capacity of the regional cross-section, E w-M (i) represents the amount of wind power curtailment in the i-th region due to insufficient short-circuit ratio of multiple renewable energy stations, E w (i) represents the total wind power generation in the i-th region; S666, loop S665 until the wind power curtailment rate of each region is obtained, and then calculate the wind power curtailment rate Q of the entire region based on the wind power curtailment rate of each region. w , the expression is: S667, based on the hydropower curtailment rate Q for the whole region and each sub-region h , photovoltaic power curtailment rate Q p And the wind power curtailment rate Q w Calculate the new energy consumption rate for the entire district and each sub-district.

Images