New energy sending scheme determination method and system considering environment and reliability

Abstract

The invention relates to the technical field of new energy transmission, and provides a new energy transmission scheme determination method and system considering environment and reliability, and the method comprises the steps: extracting the voltage deviation and frequency deviation of a new energy DC transmission system within an hour for each new energy transmission scheme, and carrying out the summation of the voltage deviation and frequency deviation to obtain the voltage support and frequency adjustment capability; extracting the fault processing time of the new energy direct current transmission system after the power grid breaks down within the hour and the recovery time after the fault is cleared, and summing to obtain the fault processing and recovery capability; taking the weighted sum of the voltage support and frequency regulation capability and the fault processing and recovery capability as a reliability benefit; for each new energy sending scheme, calculating economic benefits and environmental benefits, and carrying out weighted summation on the environmental benefits, the reliability benefits and the economic benefits as a comprehensive benefit value; and based on the comprehensive benefit value, selecting an optimal scheme from the plurality of new energy sending schemes. And a reference is provided for the design of a new energy delivery scheme, so that the development of the new energy industry is promoted.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy transmission, and in particular, relates to a method and system for determining a new energy transmission plan taking into account the environment and reliability. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The Northwest region has abundant new energy resources such as wind and solar energy, and has great development potential. However, the region is dominated by deserts and Gobi, and the AC power grid is relatively weak. The use of multiple DC lines for large-scale cross-regional transmission has gradually become the main way to output electricity. Due to geographical and technical limitations, the collection and transmission of new energy face many challenges, and there is an urgent need to conduct in-depth research on key technologies for the transmission of new energy in the desert and Gobi region.

[0004] As a key hub connecting new energy bases and load centers, the performance of the DC transmission system directly affects the safe and stable operation of the power system and the efficient use of new energy. At present, the benefit evaluation of the new energy DC transmission system mainly focuses on economic benefits, lacking a comprehensive evaluation of comprehensive factors such as environmental benefits and social benefits. This single evaluation method cannot fully reflect the overall value of the DC transmission system and may lead to deviations in planning and decision-making. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a method and system for determining a new energy transmission scheme taking into account the environment and reliability. On the basis of economic benefit evaluation, environmental benefits and reliability benefits are added, and the proposed reliability benefits include voltage support and frequency regulation capabilities and fault recovery capabilities, which characterize the stability of the new energy DC transmission system and the reliability of power supply, and can be particularly reflected in the performance under isolated island operation. It can effectively evaluate multiple new energy transmission schemes from the perspective of benefits and find the scheme with the best benefits, providing a reference for the design of new energy transmission schemes in the Shagohuang area, thereby promoting the development of the new energy industry and further improving the operation level of the power grid.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a method for determining a new energy transmission plan taking into account the environment and reliability, comprising:

[0008] Obtain several new energy delivery solutions;

[0009] For each renewable energy transmission scheme, extract the voltage deviation and frequency deviation of the renewable energy DC transmission system within the hour, and sum them up to get the voltage support and frequency regulation capacity; extract the fault handling time of the renewable energy DC transmission system after a grid fault occurs within the hour and the recovery time after the fault is cleared, and sum them up to get the fault handling and recovery capacity; take the weighted sum of the voltage support and frequency regulation capacity and the fault handling and recovery capacity as the reliability benefit;

[0010] For each new energy transmission plan, the economic and environmental benefits are calculated, and the weighted sum of environmental benefits, reliability benefits and economic benefits is taken as the comprehensive benefit value;

[0011] Based on the comprehensive benefit value, the best option is selected from several new energy transmission options.

[0012] Furthermore, the voltage support and frequency regulation capabilities are:

[0013]

[0014] Where, ΔV d,t Δf is the voltage deviation of the renewable energy DC transmission system in the tth hour of the dth day; d,t It is the frequency deviation of the renewable energy DC transmission system in the tth hour of the dth day.

[0015] Furthermore, the fault handling and recovery capabilities are:

[0016]

[0017] Among them, T fal,d,t is the fault handling time of the renewable energy DC transmission system after a grid fault occurs within the tth hour of the dth day; T ref,d,t It is the recovery time of the renewable energy DC transmission system after the grid fault is cleared within the tth hour of the dth day.

[0018] Furthermore, the calculation method of the environmental benefit is as follows: for each new energy transmission plan, the total power generation of fossil fuel power generation and the total power generation of new energy stations over the entire life cycle are extracted to calculate the equivalent benefit of carbon emission reduction; the total power output of the new energy transmission system over the entire life cycle and the land area occupied by new energy stations and energy storage facilities are extracted to calculate the equivalent benefit of land use efficiency; the equivalent benefit of carbon emission reduction and the equivalent benefit of land use efficiency are taken as environmental benefits.

[0019] Furthermore, the equivalent benefit of the carbon emission reduction is:

[0020]

[0021] Among them, E fosRepresents the total electricity generated by fossil fuels over the entire life cycle; F emi Indicates the unit carbon emission of fossil fuels; E ren Represents the total power generation of the new energy station during its entire life cycle; F emi,ren represents the unit carbon emission of renewable energy; c CO2 Represents the unit equivalent economic value of reducing carbon emissions.

[0022] Furthermore, the land use efficiency equivalent benefit is:

[0023]

[0024] Among them, E out Represents the total power output of the new energy transmission system during its entire life cycle; A use The land area occupied by new energy stations and energy storage facilities; c lan It is the equivalent benefit per land use unit.

[0025] Furthermore, the economic benefits include power generation income, penalty fees for wind and solar power abandonment, unit start-up and shutdown costs, and unit operation and maintenance costs.

[0026] A second aspect of the present invention provides a system for determining a new energy transmission plan taking into account the environment and reliability, comprising:

[0027] A data acquisition module is configured to: acquire a number of new energy delivery plans;

[0028] The reliability evaluation module is configured as follows: for each renewable energy transmission scheme, extract the voltage deviation and frequency deviation of the renewable energy DC transmission system within an hour, and sum them to obtain the voltage support and frequency regulation capacity; extract the fault handling time of the renewable energy DC transmission system after a fault occurs in the power grid within an hour and the recovery time after the fault is cleared, and sum them to obtain the fault handling and recovery capacity; and take the weighted sum of the voltage support and frequency regulation capacity and the fault handling and recovery capacity as the reliability benefit;

[0029] A comprehensive evaluation module is configured to: for each new energy transmission scheme, calculate the economic benefit and the environmental benefit, and take the weighted sum of the environmental benefit, the reliability benefit and the economic benefit as the comprehensive benefit value;

[0030] The scheme determination module is configured to select the best scheme from several new energy transmission schemes based on the comprehensive benefit value.

[0031] A third aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in a method for determining a new energy transmission plan that takes into account the environment and reliability as described above.

[0032] The fourth aspect of the present invention provides a computer device, including a computer-readable storage medium, a processor, and a computer program stored on the computer-readable storage medium and executable on the processor, wherein when the processor executes the program, the steps in a method for determining a new energy transmission plan that takes into account the environment and reliability as described above are implemented.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] On the basis of economic benefit evaluation, the present invention adds environmental benefits and reliability benefits, and the reliability benefits proposed include voltage support and frequency regulation capabilities and fault recovery capabilities, which characterize the stability of the renewable energy DC transmission system and the reliability of power supply, and can be particularly reflected in the performance under isolated island operation. It can effectively evaluate multiple renewable energy transmission schemes from the perspective of benefits and find the scheme with the best benefits, providing a reference for the design of renewable energy transmission schemes in the Shagohuang area, thereby promoting the development of the renewable energy industry and further improving the operation level of the power grid.

[0035] On the basis of economic benefit evaluation, the present invention increases environmental benefits and reliability benefits, and the environmental benefits proposed include carbon emission reduction and land use efficiency, which mainly characterize the positive impact of the new energy DC transmission system on the environment, and provide necessary basis for the selection of new energy transmission schemes. It not only helps to optimize the planning and design of the DC transmission system and improve the utilization efficiency of new energy, but also provides a scientific basis for promoting the sustainable development of the new energy industry in Northwest China. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0037] Figure 1 This is a flow chart of a method for determining a new energy transmission plan taking into account the environment and reliability in accordance with the first embodiment of the present invention;

[0038] Figure 2 A hierarchical structure diagram of the comprehensive benefit evaluation of new energy delivery according to the first embodiment of the present invention;

[0039] Figure 3 This is a comparison effect diagram of the comprehensive benefits of five new energy transmission solutions in Example 1 of the present invention;

[0040] Figure 4 It is a structural diagram of a computer device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0043] Embodiment 1

[0044] This embodiment provides a method for determining a new energy transmission plan that takes the environment and reliability into consideration.

[0045] This embodiment provides a method for determining a new energy transmission scheme that takes the environment and reliability into consideration. It comprehensively considers economic benefits, environmental benefits, and reliability benefits, and can quickly quantify and evaluate the comprehensive benefits of the new energy transmission scheme over the entire life cycle, providing the necessary basis for the selection of the new energy transmission scheme. It not only helps to optimize the planning and design of the DC transmission system and improve the utilization efficiency of new energy, but also provides a scientific basis for promoting the sustainable development of the new energy industry in the Northwest region.

[0046] This embodiment provides a method for determining a new energy transmission plan that takes into account the environment and reliability, such as Figure 1 As shown, the specific steps include:

[0047] Step 1: Set two levels of new energy transmission benefit evaluation indicators, which include first-level indicators and second-level indicators. The first-level indicators include economic benefits, environmental benefits, and reliability benefits, and the second-level indicators are the indicators of the next level corresponding to economic benefits, environmental benefits, and reliability benefits. The two-level indicators are calculated by obtaining system operation data.

[0048] like Figure 2 As shown in the figure, it is a hierarchical structure diagram of the comprehensive benefits of new energy delivery. The second-level indicators include: wind and solar revenues, penalty fees for wind and solar power abandonment, unit start-up and shutdown costs, investment and operation and maintenance costs corresponding to economic benefits; carbon emission reduction and land utilization rate corresponding to environmental benefits; voltage support and frequency regulation capabilities, and fault recovery capabilities corresponding to reliability benefits.

[0049] In the specific implementation, the comprehensive benefit evaluation indicators of new energy transmission are determined, and the comprehensive benefit evaluation is divided into two levels.

[0050] Step 101: Calculate economic benefit indicators.

[0051] Economic benefits (Ceco) are used to quantify the overall economic returns of the renewable energy DC transmission system, including power generation revenue, penalty costs for wind and solar power abandonment, unit start-up and shutdown costs, and unit operation and maintenance costs. The goal is to evaluate whether the economic benefits of the renewable energy transmission system are maximized. The calculation method of economic benefits (Ceco) is as follows:

[0052]

[0053] Wherein, T: the whole life cycle of the new energy DC transmission system from investment to completion; R d , C pen,d , C sup,swn,d , O d 、M d They are all economic benefits or costs in daily units. d represents the total revenue from the new energy delivered on day d, i.e., the revenue from power generation; C pen,d represents the penalty costs incurred by the wind power plant and photovoltaic power station due to wind and solar abandonment on day d; C sup,swn,d represents the additional cost incurred by the unit start-up and shutdown on the dth day; O d represents the operating cost of the system on day d; M d represents the maintenance cost of the system on day d. In addition, C inv Represents the total initial investment cost of wind farms, photovoltaic power stations, and energy storage systems.

[0054] Specifically, R d , O d 、M d , C pen,d , C sup,swn,d The calculation method of is as follows:

[0055] (1) Revenue calculation (R d ).

[0056] The revenue of the new energy DC transmission system mainly comes from the electricity sales revenue brought by wind power and photovoltaic power generation. The specific calculation formula is as follows:

[0057]

[0058] Among them, R d : Total revenue on day d; P win,d,t : The actual power generated by the wind farm in the tth hour of the dth day, in MW. sol,d,t : The actual power generated by the photovoltaic power station in the tth hour of the dth day, in MW. d,t: The market electricity price at the tth hour in the dth day, in RMB / MWh, reflecting the market value of electricity at that moment. Δt: The time interval, in units of 1 hour, used to convert power (MW) into energy (MWh).

[0059] (2) Penalty fees for curtailment of wind and solar power (C pen,d ).

[0060] Due to the limitation of the grid's acceptance capacity, wind and solar power abandonment will have a negative impact on economic benefits, so the penalty costs for wind and solar power abandonment are considered in the model. The penalty costs for wind and solar power abandonment on the dth day are also obtained by accumulating the time-of-use penalty costs every hour throughout the day. The calculation formula is as follows:

[0061]

[0062] Among them, P cuw,d,t : The wind power abandoned in the tth hour of the dth day, in MW. cus,d,t : The photovoltaic power abandoned in the tth hour of the dth day, in MW. pew,d,t : The penalty cost of wind power abandonment per unit in the tth hour of the dth day, in RMB / MWh, is used to quantify the economic losses caused by the failure to effectively utilize wind power during this period. pes,d,t : The penalty cost per unit of abandoned solar power in the tth hour of the dth day, in RMB / MWh, used to quantify the economic losses caused by the failure to effectively utilize photovoltaic power during this period. Δt: The time interval, in units of 1 hour.

[0063] (3) Unit start-up and shutdown costs (C sup,swn,d ).

[0064] The startup and shutdown of traditional generator sets in the renewable energy DC transmission system will incur additional costs, including energy consumption and equipment wear during startup and shutdown. The calculation formula is as follows:

[0065] C sup,swn,d =N sup,d ·c sup +N swn,d ·c swn

[0066] Among them, N sup,d : The number of new starts of all units on the dth day. N swn,d : The number of new outages of all units on day d. sup : The cost required to start the unit once, in yuan. swn : The cost required to shut down the unit once, in yuan.

[0067] (4) Investment and operation and maintenance costs.

[0068] M d : represents the maintenance cost of the unit on the dth day, in yuan; d : represents the operating cost of the unit on the dth day, including transmission loss, power dispatch and other expenses incurred during the operation, in yuan; C inv : Represents the total initial investment cost of wind farms, photovoltaic power stations and energy storage systems, in yuan.

[0069] Step 102: Calculate environmental benefit indicators.

[0070] Environmental benefits (C env ) is used to quantitatively evaluate the positive impact of renewable energy DC transmission systems on the environment, mainly through the reduction of carbon emissions and the effective use of land:

[0071] C env =αC CO2 +βC lan

[0072] Among them, α and β are weight coefficients, which respectively measure the contribution of carbon emission reduction and land utilization rate to environmental benefits. env : Environmental benefit equivalent value, in yuan; C CO2 is the equivalent benefit brought by the reduction of carbon emissions, in yuan; C lan It is the equivalent benefit brought by land use efficiency, in yuan.

[0073] (1) Carbon emission reduction (C CO2 ).

[0074] The use of renewable energy (such as wind power, solar power, etc.) reduces dependence on fossil fuels, thereby reducing carbon emissions. The calculation of carbon emission reduction is shown in the following formula:

[0075] C CO2 =(E fos ×F emi -E ren ×F emi,ren )c CO2

[0076] Among them, E fos : Total electricity generated by fossil fuels over the entire life cycle, in MWh; F emi : Carbon emissions per unit of fossil fuels, in tons / MWh; E ren : Total power generation of new energy stations (wind power, solar power, etc.) over the entire life cycle, in MWh; F emi,ren : Carbon emissions per unit of renewable energy. CO2 : Unit equivalent economic value of reducing carbon emissions, in yuan / ton.

[0077] (2) Land use efficiency (C lan ).

[0078] Land use efficiency measures the power output generated per unit area of ​​land and reflects the utilization rate of land resources. Higher land utilization rate reflects higher environmental benefits. The calculation of land use efficiency is shown in the following formula:

[0079]

[0080] Among them, E out : Total power output of the renewable energy transmission system over the entire life cycle, in MW; A use : The land area occupied by new energy stations and energy storage facilities, in hectares. lan : Equivalent benefit per unit of land use, in yuan.

[0081] Step 103: Calculate reliability benefit index.

[0082] The power supply reliability benefit is used to evaluate the stability of the new energy DC transmission system and the reliability of power supply, especially the performance under island operation conditions. The reliability benefit includes voltage support and frequency regulation capabilities, and fault recovery capabilities. The specific calculation formula is as follows:

[0083]

[0084] Where, T: total life cycle; γ1, γ2: weight coefficients of reliability indicators of each part, measuring the relative importance of grid stability and fault recovery capability to power supply reliability.

[0085] (1) Voltage support and frequency regulation capability assessment (C sta,d ).

[0086] Voltage support and frequency regulation capabilities are used to measure the ability of the renewable energy DC transmission system to maintain grid voltage and frequency stability:

[0087]

[0088] Where, ΔV d,t : Voltage deviation of the renewable energy DC transmission system in the tth hour of the dth day, in %, reflecting the degree to which the voltage deviates from the rated value. Δf d,t : Frequency deviation of the renewable energy DC transmission system in the tth hour of the dth day, in Hz, reflecting the change in frequency stability.

[0089] (2) Fault handling and recovery capability assessment (C rec,d ).

[0090] This indicator (C rec,d) is used to evaluate the ability of the new energy DC transmission system to handle faults after a fault occurs and to recover after the fault ends. It consists of two parts: the fault handling time and the recovery time after the fault is cleared. The calculation formula is:

[0091]

[0092] Among them, T fal,d,t : Fault handling time of the transmission system after a power grid fault occurs within the tth hour of the dth day; T ref,d,t : System recovery time after the grid fault is cleared within the tth hour of the dth day.

[0093] Step 2: Normalize indicators.

[0094] By obtaining the actual operating data of the second-level indicators under different renewable energy transmission schemes, the first-level indicators in the renewable energy transmission benefit evaluation model can be obtained through step 1. In order to facilitate the comparison of the relative relationship between the indicators in each scheme, the first-level indicators of each scheme need to be normalized. The maximum and minimum normalization method is adopted in the present invention. For each indicator in N schemes, N data can be obtained by X = [x1, x2, ..., x N ] is represented by the maximum and minimum normalization formula:

[0095]

[0096] In the formula, i = 1, 2, ..., N. Among them, X min =min(X), indicating the minimum value of the indicator data set; X max =max(X), which indicates the maximum value of the indicator data set. In actual operation, we first need to find the maximum and minimum values ​​in the data set; secondly, we use the above formula to normalize the data. The normalized value will be between [0, 1], preserving the relative relationship of the data. For example, the economic benefits (C eco ), its value after maximum and minimum normalization is C eco ', whose value is between [0, 1]. The relative relationship between the parts can be more intuitively represented through normalization.

[0097] As an embodiment, five different new energy transmission schemes are provided, and the values ​​of the first-level indicators are calculated by obtaining the actual operating data of the two-level indicators under the five transmission schemes. The first-level indicators of the five schemes are normalized, and the obtained values ​​are shown in Table 1.

[0098] Table 1. Examples of normalized first-level indicators

[0099] plan Economic Benefits Environmental benefits Reliability Benefits 1 0 0.255795 0.310043 2 0.217131 1 0.37393 3 1 0.110515 0 4 0.999817 0.958613 1 5 0.54771 0 0.001651

[0100] Step 3: Calculate subjective and objective weights. Determine the mutual importance of each indicator at the first level and assign corresponding weights through subjective and objective weighting methods.

[0101] In the comprehensive benefit evaluation model, the goal is to optimize the renewable energy DC transmission scheme in the Shagohuang area through a comprehensive measurement of economic benefits, environmental benefits, and reliability benefits. It is worth noting that the importance of each benefit part is different, and these importances may be affected by many factors in practical applications. Therefore, determining the weight coefficient of each part is a key step in the comprehensive evaluation model. In order to determine these weight factors more scientifically and reasonably, a subjective and objective fusion weight determination method that integrates subjective and objective factors is proposed. The method includes the following steps:

[0102] Step 301, subjective weight determination: expert experience and normalization processing.

[0103] Subjective weights are used to determine the importance of multiple indicators based on the experts’ experience and understanding of the actual situation. They are then normalized to ensure that the sum of the weights is 1.

[0104] As an example, the subjective weight They are set to 4, 3, and 2 respectively; then normalized to ensure that the sum of the weights is 1, which are 0.44, 0.33, and 0.22 respectively.

[0105] Step 302, objective weight determination: data driven method and normalization processing.

[0106] Using historical data, statistical analysis methods (such as principal component analysis, factor analysis, etc.) are used to determine the objective weight of each benefit. For example, by analyzing the historical performance of economic benefits, environmental benefits, and power supply reliability benefits, the main influencing factors are extracted and their contribution rates are calculated. Then, normalization is performed to ensure that the sum of the weights is 1.

[0107] As an example, the objective weight They are determined to be 0.55, 0.25, and 0.20 respectively.

[0108] Step 303: Coordinated optimization and integration of subjective and objective weights.

[0109] In order to balance the subjective and objective weights, an integration method based on collaborative optimization is proposed to fuse the subjective weights and objective weights. A weighted average method can be used to set a fusion coefficient λ. The specific calculation formula is as follows:

[0110]

[0111] in, are the subjective and objective weights of the ith benefit indicator, respectively. λ is the integration coefficient, ranging from [0,1], which is used to control the relative influence of subjective and objective weights. It can be set based on expert experience in the early stage, but can be dynamically adjusted based on historical data during model operation.

[0112] As an embodiment, according to the analysis of historical data, λ=0.7 is selected, and it is dynamically adjusted at any time according to the actual situation. Finally, ω1, ω2, and ω3 are obtained as 0.47, 0.31, and 0.22 respectively.

[0113] Step 4: Quantitative calculation of comprehensive benefit evaluation indicators. The weighted sum of indicators is used to obtain the comprehensive benefit values ​​of different renewable energy transmission schemes and select the best one.

[0114] The goal of comprehensive benefit assessment is to maximize the comprehensive benefits of the new energy bundled DC transmission system in the Shagohuang area. In the new energy bundled DC transmission system in the Shagohuang area, the comprehensive benefit objective function consists of three parts: economic benefit, environmental benefit and reliability benefit, and its mathematical expression is as follows:

[0115] E=ω1C eco '+ω2C env '-ω3C rel '

[0116] Among them, E represents the comprehensive benefit of the new energy DC transmission system, which is the evaluation target of the model. eco ': The economic benefits of the new energy DC transmission system after normalization reflect the overall economic benefits and operating costs of multiple new energy transmission schemes. env ': The environmental benefits of the renewable energy DC transmission system after normalization, quantifying the positive impact of renewable energy use on the environment under multiple renewable energy transmission schemes. C rel ': The reliability benefit of the new energy DC transmission system after normalization is used to evaluate the stability and reliability of the system under multiple new energy transmission schemes. In this model, the reliability benefit is a negative benefit, so the coefficient of its weight factor is negative.

[0117] Among them, ω1, ω2, ω3 are the weight coefficients of each part of the benefit, which are used to reflect the decision maker's preference for economic benefits, environmental benefits and reliability benefits, and satisfy the following formula: ω1+ω2+ω3=1.

[0118] As an example, the comprehensive benefits obtained by the five schemes are: 0.012, 0.331, 0.510, 0.556, 0.260, and the final calculation results are presented in Figure 3 After comparison, Option 4 was finally selected because of its highest comprehensive benefits.

[0119] To sum up, the present embodiment provides a method for determining a new energy transmission scheme that takes into account the environment and reliability. Indicators are grouped according to their different affiliations, and then layered according to their coverage relationships, and finally a multi-level combined and associated hierarchical structure is established. In the analysis of the benefit evaluation of the new energy transmission scheme, economic benefit, environmental benefit, and reliability benefit are established as the first-level indicators based on environmental factors and reliability factors.

[0120] Economic benefits mainly represent the overall economic return of the system, including wind and solar power income, penalty fees for wind and solar power abandonment, unit start-up and shutdown costs, investment and operation and maintenance costs as second-level indicators; environmental benefits mainly represent the positive impact of the system on the environment, including carbon emission reduction and land use efficiency as second-level indicators; reliability benefits mainly represent the stability of the system and the reliability of power supply, especially its performance under isolated island operation, including voltage support and frequency regulation capabilities, and fault recovery capabilities as second-level indicators.

[0121] After adjusting the weight factors of the first and second layer indicators, the proposed comprehensive evaluation system of new energy transmission benefits considering environmental and reliability benefits is obtained, and the following are used to evaluate the effectiveness of the new energy transmission benefits: Figure 2 The new energy transmission schemes from scheme 1 to scheme n are evaluated, and finally the most efficient new energy transmission scheme that takes environmental and reliability benefits into consideration is obtained.

[0122] This embodiment provides a method for determining a new energy transmission plan that takes the environment and reliability into consideration. The new energy transmission plan is evaluated from three dimensions: economic benefit, environmental benefit, and reliability benefit. It can effectively evaluate multiple new energy transmission plans from the perspective of benefit and find the plan with the best benefit. This provides a reference for the design of the new energy transmission plan in the Shagohuang area, thereby promoting the development of the new energy industry and further improving the operation level of the power grid.

[0123] Embodiment 2

[0124] This embodiment provides a system for determining a new energy transmission plan taking into account the environment and reliability, which specifically includes:

[0125] A data acquisition module is configured to: acquire a number of new energy delivery plans;

[0126] An economic evaluation module is configured to: for each renewable energy transmission plan, calculate the economic benefits, which include power generation income, wind and solar power abandonment penalty fees, unit start-up and shutdown costs, and unit operation and maintenance costs;

[0127] The environmental assessment module is configured as follows: for each new energy transmission scheme, the total power generation of fossil fuel power generation and the total power generation of new energy stations in the whole life cycle are extracted to calculate the equivalent benefit of carbon emission reduction; the total power output of the new energy transmission system in the whole life cycle and the land area occupied by the new energy stations and energy storage facilities are extracted to calculate the equivalent benefit of land use efficiency; the equivalent benefit of carbon emission reduction and the equivalent benefit of land use efficiency are used as environmental benefits;

[0128] The reliability evaluation module is configured as follows: for each renewable energy transmission scheme, extract the voltage deviation and frequency deviation of the renewable energy DC transmission system within an hour, and sum them to obtain the voltage support and frequency regulation capacity; extract the fault handling time of the renewable energy DC transmission system after a fault occurs in the power grid within an hour and the recovery time after the fault is cleared, and sum them to obtain the fault handling and recovery capacity; and take the weighted sum of the voltage support and frequency regulation capacity and the fault handling and recovery capacity as the reliability benefit;

[0129] A comprehensive evaluation module is configured to: for each new energy transmission scheme, take the weighted sum of environmental benefits, reliability benefits and economic benefits as a comprehensive benefit value;

[0130] The scheme determination module is configured to select the best scheme from several new energy transmission schemes based on the comprehensive benefit value.

[0131] Furthermore, the voltage support and frequency regulation capabilities are:

[0132]

[0133] Where, ΔV d,t Δf is the voltage deviation of the renewable energy DC transmission system in the tth hour of the dth day; d,t It is the frequency deviation of the renewable energy DC transmission system in the tth hour of the dth day.

[0134] Furthermore, the fault handling and recovery capabilities are:

[0135]

[0136] Among them, T fal,d,t is the fault handling time of the renewable energy DC transmission system after a grid fault occurs within the tth hour of the dth day; T ref,d,t It is the recovery time of the renewable energy DC transmission system after the grid fault is cleared within the tth hour of the dth day.

[0137] Furthermore, the equivalent benefit of carbon emission reduction is:

[0138]

[0139] Among them, Efos Represents the total electricity generated by fossil fuels over the entire life cycle; F emi Indicates the unit carbon emission of fossil fuels; E ren Represents the total power generation of the new energy station during its entire life cycle; F emi,ren represents the unit carbon emission of renewable energy; c CO2 Represents the unit equivalent economic value of reducing carbon emissions.

[0140] Furthermore, the equivalent benefit of land use efficiency is:

[0141]

[0142] Among them, E out Represents the total power output of the new energy transmission system during its entire life cycle; A use The land area occupied by new energy stations and energy storage facilities; c lan It is the equivalent benefit per land use unit.

[0143] It should be noted here that each module in this embodiment corresponds to each step in Example 1 one by one, and the specific implementation process is the same, which will not be repeated here.

[0144] Embodiment 3

[0145] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the method for determining a new energy transmission plan that takes into account the environment and reliability as described in the first embodiment above are implemented.

[0146] Embodiment 4

[0147] This embodiment provides a computer device, such as Figure 4 As shown, it includes a display device, an input device, a computer-readable storage medium (volatile memory and non-volatile storage medium), a processor, a communication interface (i.e., a network interface), and a computer program stored on the computer-readable storage medium and executable on the processor, wherein the processor, the communication interface, and the computer-readable storage medium can be connected via a bus or other means. The communication interface is used to receive and send data, and when the processor executes the program, the steps in the method for determining a new energy delivery plan taking into account the environment and reliability as described in the first embodiment above are implemented.

[0148] Among them, any reference to memory, storage, database or other media provided by the present application and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual-speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0149] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0150] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0151] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0152] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for determining a new energy transmission plan taking into account the environment and reliability, characterized in that: include: Obtain several new energy delivery solutions; For each renewable energy transmission scheme, extract the voltage deviation and frequency deviation of the renewable energy DC transmission system within the hour, and sum them up to get the voltage support and frequency regulation capacity; extract the fault handling time of the renewable energy DC transmission system after a grid fault occurs within the hour and the recovery time after the fault is cleared, and sum them up to get the fault handling and recovery capacity; take the weighted sum of the voltage support and frequency regulation capacity and the fault handling and recovery capacity as the reliability benefit; For each new energy transmission plan, the economic and environmental benefits are calculated, and the weighted sum of environmental benefits, reliability benefits and economic benefits is taken as the comprehensive benefit value; Based on the comprehensive benefit value, the best option is selected from several new energy transmission options.

2. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 1, characterized in that: The voltage support and frequency regulation capabilities are: Where, ΔV d,t Δf is the voltage deviation of the renewable energy DC transmission system in the tth hour of the dth day; d,t It is the frequency deviation of the renewable energy DC transmission system in the tth hour of the dth day.

3. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 1, characterized in that: The fault handling and recovery capabilities are: Among them, T fal,d,t is the fault handling time of the renewable energy DC transmission system after a grid fault occurs within the tth hour of the dth day; T ref,d,t It is the recovery time of the renewable energy DC transmission system after the grid fault is cleared within the tth hour of the dth day.

4. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 1, characterized in that: The method for calculating the environmental benefits is as follows: for each new energy transmission plan, the total power generation of fossil fuel power generation and the total power generation of new energy stations over the entire life cycle are extracted to calculate the equivalent benefit of carbon emission reduction; the total power output of the new energy transmission system over the entire life cycle and the land area occupied by new energy stations and energy storage facilities are extracted to calculate the equivalent benefit of land use efficiency; the equivalent benefit of carbon emission reduction and the equivalent benefit of land use efficiency are used as environmental benefits.

5. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 4, characterized in that: The equivalent benefits of carbon emission reduction are: Among them, E fos Represents the total electricity generated by fossil fuels over the entire life cycle; F emi Indicates the unit carbon emission of fossil fuels; E ren Represents the total power generation of the new energy station during its entire life cycle; F emi,ren represents the unit carbon emission of renewable energy; c CO2 Represents the unit equivalent economic value of reducing carbon emissions.

6. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 4, characterized in that: The equivalent benefit of land use efficiency is: Among them, E out Represents the total power output of the new energy transmission system during its entire life cycle; A use The land area occupied by new energy stations and energy storage facilities; c lan It is the equivalent benefit per land use unit.

7. A method for determining a new energy transmission plan taking into account the environment and reliability as claimed in claim 1, characterized in that: The economic benefits include power generation income, penalty fees for wind and solar power curtailment, unit start-up and shutdown costs, and unit operation and maintenance costs.

8. A system for determining a new energy transmission plan taking into account the environment and reliability, characterized in that: include: A data acquisition module is configured to: acquire a number of new energy delivery plans; The reliability evaluation module is configured as follows: for each renewable energy transmission scheme, extract the voltage deviation and frequency deviation of the renewable energy DC transmission system within an hour, and sum them to obtain the voltage support and frequency regulation capacity; extract the fault handling time of the renewable energy DC transmission system after a fault occurs in the power grid within an hour and the recovery time after the fault is cleared, and sum them to obtain the fault handling and recovery capacity; and take the weighted sum of the voltage support and frequency regulation capacity and the fault handling and recovery capacity as the reliability benefit; A comprehensive evaluation module is configured to: for each new energy transmission scheme, calculate the economic benefit and the environmental benefit, and take the weighted sum of the environmental benefit, the reliability benefit and the economic benefit as the comprehensive benefit value; The scheme determination module is configured to select the best scheme from several new energy transmission schemes based on the comprehensive benefit value.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps in a method for determining a new energy transmission plan taking into account the environment and reliability are implemented as described in any one of claims 1 to 7.

10. A computer device comprising a computer-readable storage medium, a processor, and a computer program stored in the computer-readable storage medium and executable on the processor, characterized in that: When the processor executes the program, the steps in a method for determining a new energy transmission plan taking into account the environment and reliability are implemented as described in any one of claims 1 to 7.

Images