Network-following and network-constructing mixed type new energy proportion configuration method and device

Abstract

The invention discloses a network-following and network-constructing hybrid new energy proportion configuration method and device. The method comprises the following steps: when all new energy sources adopt network-following inverters, calculating a multi-station short-circuit ratio of all new energy sources in the step; all new energy multi-station short-circuit ratio standard deviation SCR standard deviations in the step are calculated; if the SCR standard deviation is greater than or equal to 0, configuring the net-forming type new energy according to the capacity P of all net-forming type new energy in the step, wherein P is equal to 0 in the step; if the SCR standard deviation is less than 0, calculating the short-circuit ratio of all new energy multi-station stations in the step when the new energy all adopts a network-forming inverter; all new energy multi-station short-circuit ratio standard deviation values are calculated; and if all new energy multi-station short-circuit ratio standard deviation values are greater than 0, calculating all new energy multi-station short-circuit ratio deviation maximum values and all new energy capacity step-to-step deviation absolute value maximum values, and if a preset criterion is met, configuring the network-building type new energy according to all network-building type new energy capacity in the step.

Description

Technical Field

[0001] The present invention relates to the technical field of large power grid planning, and more specifically, to a method and device for configuring a hybrid new energy ratio for following and building a grid. Background Art

[0002] According to the relationship between the inverter and the grid it is connected to, the control technology of the inverter can be divided into two types: grid-following and grid-forming. From the perspective of achieving the goal of the control strategy: the main goal of the grid-following control strategy is to feed power into the grid, and supporting the grid is a secondary goal. The grid-forming control strategy can support the grid, and in the face of the "double-high" power system, the role of the grid-forming control strategy is gradually highlighted. From the perspective of the control variable: the control variable of the grid-following inverter is the current I, which is a current closed-loop control that introduces a phase-locked loop with the grid voltage U and phase angle δ as reference. When connected to the grid, it is equivalent to a controlled current source, so it is also called a current-controlled inverter. When the grid presents weak grid strength, due to the introduction of the phase-locked loop, the stability of the grid-following inverter system is poor, there is a harmonic oscillation problem, which will deteriorate the stability of the system. The control variables of the grid-forming inverter are the phase angle θ and amplitude U of the voltage. The reference phase angle of the control strategy can be generated without the intervention of the phase-locked loop, so the stability is better than that of the grid-following inverter. The new energy source that adopts the grid-following inverter in this patent is called the grid-following new energy source, and the new energy source that adopts the grid-building inverter in this patent is called the grid-building new energy source.

[0003] The definition of the short-circuit ratio of new energy multi-feed is the ratio of the short-circuit capacity at the collection bus to the output of the new energy station before the new energy is connected to the system. The definition of the short-circuit ratio of new energy multi-stations is the ratio of the short-circuit capacity of the grid-connected point of the new energy station to the equivalent power of new energy after considering the influence of other new energy stations. The short-circuit ratio calculation and analysis is used to measure the strength of the AC system to which the new energy station is connected. According to the requirements of GB_T40581-2021 "Power System Safety and Stability Calculation Specification", for the connection of new energy multi-stations to the AC system, the short-circuit ratio of the multi-station on the low-voltage side of the new energy power generation unit should not be less than 1.5, and the short-circuit ratio of the multi-station on the grid-connected point of the new energy should not be less than 2.0 and should be greater than 3.0. The access of grid-connected new energy can improve system stability and enhance the short-circuit ratio of new energy multi-stations. However, how to determine the configuration ratio of grid-connected and grid-connected hybrid new energy has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method and device for configuring the proportion of hybrid new energy sources for following the grid and building the grid.

[0005] According to one aspect of the present invention, a method for configuring the proportion of new energy sources for network following and network building hybrid is provided, comprising:

[0006] When all new energy sources use grid-following inverters, calculate the short-circuit ratio SCR of all new energy sources in this step. 本步 ;

[0007] According to this step, all new energy multi-station short-circuit ratio SCR 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5;

[0008] If SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration;

[0009] If SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ;

[0010] Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P 上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy;

[0011] According to the previous step, all new energy multi-station short-circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ;

[0012] If all new energy multiple stations short circuit ratio standard deviation SCR 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

[0013] Optionally, according to the previous step, all new energy multi-station short circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ,include:

[0014] According to the previous step, all new energy multi-station short-circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 Calculate the total grid-connected new energy capacity P in this step 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5];

[0015] According to the new energy capacity P of the network structure in this step 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 ;

[0016] According to the recalculated short-circuit ratio SCR of all new energy multi-stations in this step 本步 Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.5.

[0017] Optionally, it also includes:

[0018] If the SCR is not met max ≤SCR 阈值 or P step_max ≤P 步间阈值 Or if all new energy multiple stations short circuit ratio standard deviation SCR 标准差 If there is less than or equal to 0, then calculate the step difference P of all grid-connected new energy capacity 分步差 =P 上步 -P 本步 And set the previous step of network construction type new energy capacity to P 上步 =P 本步 ;

[0019] Calculate the short-circuit ratio step difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR 本步 ;

[0020] Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR本步 ;

[0021] Calculate the difference capacity P of the grid-connected new energy that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 ;

[0022] Calculate the capacity P that should be set for the new energy source of this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 调0 For this step, the capacity of the new energy grid should be fine-tuned;

[0023] Cycle and recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 , determine the configuration plan for grid-building new energy capacity.

[0024] Optionally, when the step difference of all grid-connected new energy capacity P 分步差 =0 and all new energy multi-station short circuit ratio standard deviation SCR 标准差 If there is a case where it is less than 0, then P 调0 =1, otherwise P 调0 =0.

[0025] According to another aspect of the present invention, a hybrid new energy proportion configuration device for following a network and building a network is provided, comprising:

[0026] The first calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step when all new energy sources adopt grid-following inverters. 本步 ;

[0027] The second calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5;

[0028] Judgment module, used if SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration;

[0029] The third calculation module is used if SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ;

[0030] The first setting module is used to set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P 上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy;

[0031] The fourth calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations in the previous step. 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ;

[0032] Configuration module, used if all new energy multi-station short circuit ratio standard deviation SCR 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步 Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

[0033] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the storage medium stores a computer program, and the computer program is used to execute the method described in any one of the above aspects of the present invention.

[0034] According to another aspect of the present invention, an electronic device is provided, comprising: a processor; a memory for storing instructions executable by the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of the above aspects of the present invention.

[0035] Therefore, the present invention proposes a method for configuring the proportion of hybrid new energy sources following the grid and building the grid taking into account the short-circuit ratio constraint of multiple new energy stations. Under the condition of considering the short-circuit ratio constraint of multiple new energy stations, a method for optimizing the configuration proportion of hybrid new energy sources following the grid and building the grid is clarified, so as to obtain a reasonable configuration proportion of hybrid new energy sources following the grid and building the grid that can meet the short-circuit ratio requirement of multiple new energy stations, and optimize the economy of the configuration of hybrid new energy sources following the grid and building the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0037] Figure 1 It is a flow chart of a method for configuring a proportion of hybrid new energy sources for following and building a network provided by an exemplary embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of a calculation example provided by an exemplary embodiment of the present invention;

[0039] Figure 3 It is a structural schematic diagram of a hybrid new energy proportional configuration device for following the grid and building the grid provided by an exemplary embodiment of the present invention;

[0040] Figure 4 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0041] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0042] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0043] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0044] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0045] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0046] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0047] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0048] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0051] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] Embodiments of the present invention can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0053] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0054] Exemplary Methods

[0055] Figure 1 1 is a flow chart of a method for configuring a hybrid new energy ratio for network connection and network construction provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the method 100 for configuring the proportion of hybrid new energy sources for following the grid and building the grid includes the following steps:

[0056] Step 101, when all new energy sources adopt grid-following inverters, calculate the short-circuit ratio SCR of all new energy sources in this step 本步 ;

[0057] Step 102, according to the short circuit ratio SCR of all new energy multi-stations in this step 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5;

[0058] Step 103, if SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration;

[0059] Step 104, if SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ;

[0060] Step 105, set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P 上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy;

[0061] Step 106: According to the short-circuit ratio SCR of all new energy multi-stations in the previous step 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ;

[0062] Step 107: If all new energy multi-station short circuit ratio standard deviation SCR 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步 Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

[0063] Specifically, according to the actual characteristics of the power grid and the safety and stability standards of the power system, a method for configuring the proportion of hybrid new energy sources for grid-following and grid-building is proposed, which can consider the short-circuit ratio constraints of multiple stations of the new energy power generation unit and the new energy grid connection point. Under the condition of meeting the short-circuit ratio requirements of multiple stations of new energy, the proportion of hybrid new energy sources for grid-following and grid-building is optimized to ensure the economy of hybrid new energy configuration for grid-following and grid-building. It includes the following steps:

[0064] Step 1: Given the short circuit ratio deviation threshold SCR 阈值 , given the grid-type new energy inter-step capacity deviation threshold P 步间阈值 , the total capacity of new energy is P 全部 .

[0065] Step 2: When all new energy sources use grid-following inverters, the capacity of the grid-following inverter is P 本步 =0, use PSD-BPA program to calculate the short-circuit ratio SCR of all new energy multi-stations 本步 .

[0066] Step 3: Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.5.

[0067] Step 4: If SCR 标准差If both are greater than 0, go to Step 21, otherwise, go to the next step.

[0068] Step 5: When all new energy sources use grid-connected inverters, the capacity of all grid-connected new energy sources is P 本步 =P 全部 , using PSD-BPA program to calculate the short-circuit ratio SCR of all new energy multi-stations 本步 .

[0069] Step 6: Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 .

[0070] Step 7: Set the capacity of all network-building new energy sources in the previous step to P 上步 =P 本步 .

[0071] Step 8: Calculate the grid-connected inverter capacity P that should be set in this step according to the following formula 本步 :

[0072] P 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5]

[0073] Step 9: According to the network-based new energy capacity P 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations 本步 .

[0074] Step 10: Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.5.

[0075] Step 11: If SCR 标准差 If both are greater than 0, proceed to the next step; otherwise, proceed to Step 14.

[0076] Step 12: Calculate the maximum short-circuit ratio deviation SCR of all new energy multi-stations max =max(SCR 标准差 ), calculate the maximum absolute value P of the inter-step deviation of all new energy capacity step_max =max[abs(P 本步 -P 上步 )].

[0077] Step 13: If SCR max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then go to Step 21, otherwise go to the next step.

[0078] Step 14: Calculate the step-by-step difference P of all grid-connected new energy capacity 分步差 =P 上步 -P 本步 .

[0079] Step 15: Set the capacity of the new energy source for the previous step to P 上步 =P 本步 .

[0080] Step 16: Calculate the short-circuit ratio difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR this step.

[0081] Step 17: Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 .

[0082] Step 18: Calculate the grid-connected new energy difference capacity P that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 .

[0083] Step 19: Calculate the capacity P of the new energy source that should be set in this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 分步差 = 0 and SCR 标准差 When there is a situation where P is less than 0, 调0 =1, otherwise P 调0 =0,P 调0 For this step, the capacity fine-tuning amount of the grid-building new energy should be set to make the short-circuit ratio of multiple new energy stations close to 1.5 after the grid-building new energy is configured. For stations with a short-circuit ratio less than 1.5, one more grid-building new energy unit can be configured to ensure that the short-circuit ratio of multiple new energy stations at the station is not less than 1.5.

[0084] Step 20: Go to Step 9.

[0085] Step 21: The grid-connected new energy should be based on the capacity P of this step 本步 Configuration, the program terminates.

[0086] In one embodiment of the present invention, Figure 2 Take the following as an example to illustrate the use of this patent. Figure 1It contains four wind farms, and PSD-BPA simulation software is used for equivalent modeling. Each wind farm can be equivalent to multiple wind farms. The specific BPA model and capacity are shown in Table 1.

[0087] Table 1 List of all new energy station capacities P

[0088]

[0089]

[0090] The content is implemented as follows:

[0091] Step 1: Given the short circuit ratio deviation threshold SCR 阈值 =0.13, given the grid-type new energy inter-step capacity deviation threshold P 步间阈值 =0, the total capacity of new energy is P 全部 As shown in Table 2.

[0092] Table 2 New energy station capacity P 全部 List

[0093]

[0094] Step 2: When all new energy sources use grid-following inverters, P 本步 =0, calculate the short-circuit ratio SCR of all new energy multi-stations 本步 The results are shown in Table 3.

[0095] Table 3 All new energy sources with grid-following new energy sources have short-circuit ratios SCRs at multiple stations 本步 Results List

[0096]

[0097] Step 3: Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.5. The results are shown in Table 4.

[0098] Table 4: All new energy sources with grid-connected type, all short-circuit ratio standard deviation SCR of multiple stations 标准差 Results List

[0099]

[0100]

[0101] Step 4: Due to SCR 标准差 There is a case where it is less than 0, so go to the next step.

[0102] Step 5: When all new energy sources use grid-connected inverters, the capacity of all grid-connected new energy sources is P 本步 =P 全部 , calculate the short-circuit ratio SCR of all new energy multi-stations 本步 The results are shown in Table 5.

[0103] Table 5 All new energy sources for grid-connected new energy sources with multiple stations short-circuit ratio SCR 本步 Results List

[0104]

[0105] Step 6: Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 .

[0106] Step 7: Set the capacity of all network-building new energy sources in the previous step to P 上步 =P 本步 .

[0107] Step 8: Calculate the grid-connected inverter capacity P that should be set in this step according to the following formula 本步 .

[0108] P 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5]

[0109] The specific results are shown in Table 6.

[0110] Table 6 The grid-connected inverter capacity P that should be set in this step 本步 Results List

[0111]

[0112] Step 9: According to the grid-type inverter capacity P 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations 本步 The results are shown in Table 7.

[0113] Table 7 Short-circuit ratio SCR of all new energy multi-stations in this step 本步 Results List

[0114]

[0115]

[0116] Step 10: Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 The results are shown in Table 8.

[0117] Table 8 Standard deviation of short circuit ratio SCR of all new energy multi-stations in this step 标准差 Results List

[0118]

[0119] Step 11: Due to SCR 标准差 There is a case where it is less than 0, so go to Step 14.

[0120] Step 14: Calculate the step-by-step difference P of the set grid-type new energy capacity 分步差 =P 上步 -P 本步 The results are shown in Table 9.

[0121] Table 9 Set up the grid-type new energy capacity step difference P 分步差 Results List

[0122]

[0123] Step 15: Set the capacity of the new energy source for the previous step to P 上步 =P 本步 .

[0124] Step 16: Calculate the short-circuit ratio difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR 本步 The results are shown in Table 10.

[0125] Table 10 Short circuit ratio of all new energy multi-station step difference SCR 分步差 Results List

[0126]

[0127]

[0128] Step 17: Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 .

[0129] Step 18: Calculate the grid-connected new energy difference capacity P that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 The results are shown in Table 11.

[0130] Table 11 The difference capacity P of the grid-connected new energy that should be adjusted 差值 Results List

[0131]

[0132] Step 19: Calculate the capacity P of the new energy source that should be set in this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 分步差 ≠0, therefore, P 调0 = 0. 本步 The results are shown in Table 12.

[0133] Table 12 Capacity P of new energy sources to be set for this step of grid construction 本步 Results List

[0134]

[0135] Step 20: Go to Step 9.

[0136] Step 9: According to the grid-type inverter capacity P 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations 本步 The results are shown in Table 13.

[0137] Table 13 Short-circuit ratio SCR of multiple stations of new energy in this step 本步 Results List

[0138]

[0139]

[0140] Step 10: Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 The results are shown in Table 14.

[0141] Table 14 Standard deviation of short circuit ratio SCR of all new energy multi-stations in this step 标准差 Results List

[0142]

[0143] Step 11: Due to SCR 标准差 Both are greater than 0, so proceed to the next step.

[0144] Step 12: Calculate the maximum short-circuit ratio deviation SCR of all new energy multi-stations max =max(SCR 标准差 )=0.121. Calculate the maximum absolute value P of the inter-step deviation of all new energy capacity step_max =max[abs(P 本步 -P 上步 )]

[0145] Step 13: Due to SCR max =0.121 <SCR 阈值 =0.13, therefore, proceed to Step 21.

[0146] Step 21: The grid-connected new energy should be based on the capacity P of this step as shown in Table 12. 本步 Configuration, the program terminates.

[0147] Therefore, the present invention proposes a method for configuring the proportion of hybrid new energy sources following the grid and building the grid taking into account the short-circuit ratio constraint of multiple new energy stations. Under the condition of considering the short-circuit ratio constraint of multiple new energy stations, a method for optimizing the configuration proportion of hybrid new energy sources following the grid and building the grid is clarified, so as to obtain a reasonable configuration proportion of hybrid new energy sources following the grid and building the grid that can meet the short-circuit ratio requirement of multiple new energy stations, and optimize the economy of the configuration of hybrid new energy sources following the grid and building the grid.

[0148] Exemplary Devices

[0149] Figure 3 Schematic diagram of a hybrid new energy proportion configuration device for grid-following and grid-building provided by an exemplary embodiment of the present invention. Figure 3 As shown, the device 300 includes:

[0150] The first calculation module 310 is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step when all new energy sources adopt grid-following inverters. 本步 ;

[0151] The second calculation module 320 is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step. 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5;

[0152] The judging module 330 is used to determine if the SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration;

[0153] The third calculation module 340 is used to calculate the SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ;

[0154] The first setting module 350 is used to set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy;

[0155] The fourth calculation module 360 ​​is used to calculate the short-circuit ratio SCR of all new energy multi-stations in the previous step. 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ;

[0156] Configuration module 370, used for all new energy multi-station short circuit ratio standard deviation SCR 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步 Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

[0157] Optionally, the fourth calculation module 360 ​​includes:

[0158] The first calculation submodule is used to calculate the short-circuit ratio SCR of all new energy multi-stations in the previous step. 上步 And the total grid-connected new energy capacity P in the previous step 上步 Calculate the total grid-connected new energy capacity P in this step 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5];

[0159] The second calculation submodule is used to calculate the new energy capacity P of the network type in this step. 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 ;

[0160] The third calculation submodule is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step according to the recalculated 本步 Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR本步 -1.5.

[0161] Optionally, the apparatus 300 further includes:

[0162] The fifth calculation module is used for if the SCR is not satisfied max ≤SCR 阈值 or P step_max ≤P 步间阈值 Or if all new energy multiple stations short circuit ratio standard deviation SCR 标准差 If there is less than or equal to 0, then calculate the step difference P of all grid-connected new energy capacity 分步差 =P 上步 -P 本步 And set the previous step of network construction type new energy capacity to P 上步 =P 本步 ;

[0163] The sixth calculation module is used to calculate the short-circuit ratio step difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR 本步 ;

[0164] The second setting module is used to set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 ;

[0165] The seventh calculation module is used to calculate the grid-type new energy difference capacity P that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 ;

[0166] The eighth calculation module is used to calculate the capacity P that should be set for the grid-building new energy in this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 调0 For this step, the capacity of the new energy grid should be fine-tuned;

[0167] The loop module is used to recalculate the short-circuit ratio SCR of all new energy multi-stations in this step. 本步 , determine the configuration plan for grid-building new energy capacity.

[0168] Optionally, when the step difference of all grid-connected new energy capacity P 分步差 =0 and all new energy multi-station short circuit ratio standard deviation SCR 标准差 If there is a case where it is less than 0, then P 调0 =1, otherwise P 调0 =0.

[0169] Exemplary Electronic Devices

[0170] Figure 4 This is a structure of an electronic device provided by an exemplary embodiment of the present invention. Figure 4 As shown, the electronic device 40 includes one or more processors 41 and a memory 42 .

[0171] The processor 41 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0172] The memory 42 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 41 may run the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above and / or other desired functions. In one example, the electronic device may also include: an input device 43 and an output device 44, which are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0173] In addition, the input device 43 may also include, for example, a keyboard, a mouse, etc.

[0174] The output device 44 can output various information to the outside, and can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto.

[0175] Of course, to simplify, Figure 4 Only some of the components related to the present invention in the electronic device are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, the electronic device may further include any other appropriate components according to specific application conditions.

[0176] Exemplary computer program products and computer-readable storage media

[0177] In addition to the above-mentioned methods and devices, an embodiment of the present invention may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above-mentioned "Exemplary Method" section of this specification.

[0178] The computer program product may be written in any combination of one or more programming languages ​​to write program code for performing the operations of the embodiments of the present invention, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0179] In addition, an embodiment of the present invention may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present invention described in the above “Exemplary Method” section of this specification.

[0180] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, system or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0181] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0182] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0183] The block diagrams of the devices, systems, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, systems, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0184] The method and system of the present invention may be implemented in many ways. For example, the method and system of the present invention may be implemented by software, hardware, firmware or any combination of software, hardware, firmware. The above order of steps for the method is only for illustration, and the steps of the method of the present invention are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present invention may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present invention. Thus, the present invention also covers a recording medium storing a program for executing the method according to the present invention.

[0185] It should also be noted that in the system, device and method of the present invention, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined here can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown here, but in accordance with the widest range consistent with the principles and novel features disclosed here.

[0186] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for configuring the proportion of hybrid new energy sources for grid-following and grid-building, characterized in that: include: When all new energy sources use grid-following inverters, calculate the short-circuit ratio SCR of all new energy sources in this step. 本步 ; According to the short-circuit ratio SCR of all new energy multi-stations in this step 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5; If SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration; If SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ; Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P 上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy; According to the previous step, all new energy multi-station short-circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ; If the short-circuit ratio standard deviation value SCR of all new energy multi-stations 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步 Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

2. The method according to claim 1, characterized in that According to the previous step, all new energy multi-station short-circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ,include: According to the previous step, all new energy multi-station short-circuit ratio SCR 上步 And the total grid-connected new energy capacity P in the previous step 上步 Calculate the total grid-connected new energy capacity P in this step 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5]; According to the new energy capacity P of the network construction type in this step 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 ; According to the recalculated short-circuit ratio SCR of all new energy multi-stations in this step 本步 Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.

5.

3. The method according to claim 1, characterized in that Also includes: If the SCR is not met max ≤SCR 阈值 or P step_max ≤P 步间阈值 Or if the short circuit ratio standard deviation value SCR of all new energy multi-stations 标准差 If there is less than or equal to 0, then calculate the step difference P of all grid-connected new energy capacity 分步差 =P 上步 -P 本步 And set the previous step of network construction type new energy capacity to P 上步 =P 本步 ; Calculate the short-circuit ratio step difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR 本步 ; Set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 ; Calculate the difference capacity P of the grid-connected new energy that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 ; Calculate the capacity P that should be set for the new energy source of this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 调0 For this step, the capacity of the new energy grid should be fine-tuned; Cycle and recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 , determine the configuration plan for grid-building new energy capacity.

4. The method according to claim 3, characterized in that When the step-by-step difference of all grid-connected new energy capacity P 分步差 =0 and all new energy multi-station short circuit ratio standard deviation SCR 标准差 If there is a case where it is less than 0, then P 调0 =1, otherwise P 调0 =0.

5. A hybrid new energy proportional configuration device for following the grid and building the grid, characterized in that: include: The first calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step when all new energy sources adopt grid-following inverters. 本步 ; The second calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step. 本步 Calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations in this step 标准差 =SCR 本步 -1.5; Judgment module, used if SCR 标准差 are greater than or equal to 0, then the grid-forming new energy capacity P of all grid-forming new energy in this step 本步 =0 configuration; The third calculation module is used if SCR 标准差 If the short circuit ratio SCR of all new energy multi-stations is less than 0, then when all new energy sources adopt grid-type inverters, calculate the short circuit ratio SCR of all new energy multi-stations in this step. 本步 ; The first setting module is used to set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 And the total grid-connected new energy capacity in the previous step is P 上步 =P 本步 =P 全部 , where P 全部 is the total capacity of new energy; The fourth calculation module is used to calculate the short-circuit ratio SCR of all new energy multi-stations according to the previous step. 上步 And the total grid-connected new energy capacity P in the previous step 上步 , calculate the standard deviation of short-circuit ratio SCR of all new energy multi-stations 标准差 ; Configuration module, used for if all the new energy multi-station short circuit ratio standard deviation SCR 标准差 If all are greater than 0, the maximum short-circuit ratio deviation SCR of all new energy multi-stations is calculated max =max(SCR 标准差 ) and the maximum absolute value of the deviation between steps of all new energy capacity P step_max =max[abs(P 本步 -P 上步 )], if SCR is met max ≤SCR 阈值 or P step_max ≤P 步间阈值 , then the grid-connected new energy capacity P of all grid-connected new energy in this step 本步 Configuration, where SCR 阈值 is a given short circuit ratio deviation threshold, P 步间阈值 is the deviation threshold of the inter-step capacity of new energy for a given grid configuration.

6. The device according to claim 5, characterized in that The fourth computing module includes: The first calculation submodule is used to calculate the short-circuit ratio SCR of all new energy multi-stations in the previous step. 上步 And the total grid-connected new energy capacity P in the previous step 上步 Calculate the total grid-connected new energy capacity P in this step 本步 =P 上步 *[1-(SCR 上步 -1.5) / 1.5]; The second calculation submodule is used to calculate the network type new energy capacity P according to the current step. 本步 , recalculate the short-circuit ratio SCR of all new energy multi-stations in this step 本步 ; The third calculation submodule is used to calculate the short-circuit ratio SCR of all new energy multi-stations in this step according to the recalculated 本步 Calculate the standard deviation of short-circuit ratio (SCR) of all new energy multi-stations 标准差 =SCR 本步 -1.

5.

7. The device according to claim 5, characterized in that Also includes: The fifth calculation module is used for if the SCR is not satisfied max ≤SCR 阈值 or P step_max ≤P 步间阈值 Or if the short circuit ratio standard deviation value SCR of all new energy multi-stations 标准差 If there is less than or equal to 0, then calculate the step difference P of all grid-connected new energy capacity 分步差 =P 上步 -P 本步 And set the previous step of network construction type new energy capacity to P 上步 =P 本步 ; The sixth calculation module is used to calculate the short-circuit ratio step difference SCR of all new energy multi-stations 分步差 =SCR 上步 -SCR 本步 ; The second setting module is used to set the short-circuit ratio of all new energy multi-stations in the previous step to SCR 上步 =SCR 本步 ; The seventh calculation module is used to calculate the grid-type new energy difference capacity P that should be adjusted 差值 =-P 分步差 *SCR 标准差 / SCR 分步差 ; The eighth calculation module is used to calculate the capacity P that should be set for the grid-building new energy in this step 本步 = Round up (P 上步 +P 差值 )+P 调0 , where P 调0 For this step, the capacity of the new energy grid should be fine-tuned; The loop module is used to recalculate the short-circuit ratio SCR of all new energy multi-stations in this step. 本步 , determine the configuration plan for grid-building new energy capacity.

8. The device according to claim 7, characterized in that When the step-by-step difference of all grid-connected new energy capacity P 分步差 =0 and all new energy multi-station short circuit ratio standard deviation SCR 标准差 If there is a case where it is less than 0, then P 调0 =1, otherwise P 调0 =0.

9. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 1 to 4.

10. An electronic device, characterized in that: The electronic device comprises: processor; a memory for storing instructions executable by the processor; The processor is used to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1 to 4.

Images