A method and system for grouping new energy generating units

Abstract

The application relates to a new energy generator set grouping method and system, which comprises the following steps: step 1, initializing i=1, a=1, and setting a reference new energy generator set; step 2, determining the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set according to the output current of the new energy generator set numbered i; step 3, if the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is less than a threshold value, the new energy generator set numbered i is divided into the a-th machine group, and the step 4 is returned; otherwise, the equivalent machine set corresponding to the a-th machine group is taken as the reference new energy generator set, a=a+1 is set, and the step 2 is returned; and step 4, judging whether there is an ungrouped new energy generator set, if yes, i=i+1 is set, and the step 2 is returned, and if not, a grouping result is output. The scheme provided by the application can group new energy generator sets, thereby providing a basis for multi-machine modeling of new energy generator sets.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy grid connection, and in particular relates to a grouping method and system for new energy generator sets. Background Art

[0002] With the continuous development of new energy, the installed capacity of new energy generators accounts for an increasingly larger proportion of the local total power capacity, which makes the new energy injection rate continue to increase; at the same time, the absorption capacity of new energy is limited, and the excess new energy needs to be frequently transmitted to the load center through long-distance transmission lines, which makes new energy have a greater impact on the transient stability operation of the power system.

[0003] Modeling renewable energy generators is a key method for analyzing them. Traditional renewable energy generators are modeled using a single unit, often using a single-unit multiplication approach. This involves multiplying the model of each unit by the total number of units, then equating the aggregate lines based on the principle of equal losses. This yields a model that multiplies the total number of units by the single unit and equates it to a single aggregate line.

[0004] However, because different renewable energy generators are coupled together via collector lines, long collector lines can lead to interactions between the generators. These interactions significantly impact the transient output characteristics of the generators, rendering single-unit modeling approaches inaccurate. Therefore, to ensure the effectiveness of equivalent modeling of renewable energy generators, multi-unit modeling is required. Multi-unit modeling presupposes grouping of renewable energy generators. Therefore, a method and system for grouping renewable energy generators is essential. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method and system for grouping new energy generator sets, which can accurately group new energy generator sets according to the terminal voltage difference between the new energy generator sets and the reference new energy generator sets, thereby providing a basis for multi-machine modeling of new energy generator sets.

[0006] The purpose of the present invention is achieved by adopting the following technical solutions:

[0007] A method for grouping new energy generator sets, wherein the improvement is that the method comprises:

[0008] Step 1. Initialize the new energy generator set number i=1 and the number of generator sets a=1, and the new energy generator set numbered 1 is the reference new energy generator set;

[0009] Step 2. Determine the terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set based on the output current of the new energy generator set numbered i;

[0010] Step 3. If the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is less than the threshold, the new energy generator set numbered i is assigned to the ath generator group and the process proceeds to step 4. Otherwise, the equivalent generator set corresponding to the ath generator group is used as the reference new energy generator set, a=a+1 is set, and the process returns to step 2.

[0011] Step 4. Determine whether there are any ungrouped new energy generators. If so, set i=i+1 and return to step 2. If not, output the grouping result.

[0012] Furthermore, before step 1, the following steps are included:

[0013] Number the new energy generating units connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line;

[0014] Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

[0015] Preferably, the step 2 comprises:

[0016] If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0;

[0017] Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n :

[0018]

[0019] In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set;

[0020] Among them, when a=1, c=1.

[0021] Preferably, the process of obtaining the equivalent unit corresponding to the a-th unit group includes:

[0022] The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

[0023] A grouping system for a new energy generator set, the improvement of which is that the system comprises:

[0024] An initialization unit is used to initialize the number of the new energy generator set i=1 and the number of the generator set a=1, and the new energy generator set numbered 1 is a reference new energy generator set;

[0025] a determining unit, configured to determine a terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set according to an output current of the new energy generator set numbered i;

[0026] A grouping unit is configured to, if the terminal voltage difference between the new energy generator group numbered i and the reference new energy generator group is less than a threshold value, group the new energy generator group numbered i into the a-th group and transfer the result to the judgment unit; otherwise, use the equivalent group corresponding to the a-th group as the reference new energy generator group, set a=a+1 and return to the determination unit;

[0027] The judgment unit is used to judge whether there are ungrouped new energy generator sets. If so, set i=i+1 and return to the determination unit. If not, output the grouping result.

[0028] Furthermore, the system further comprises:

[0029] A numbering unit, used to number the new energy generating sets connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line;

[0030] Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

[0031] Preferably, the determining unit is specifically configured to:

[0032] If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0;

[0033] Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n :

[0034]

[0035] In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set;

[0036] Among them, when a=1, c=1.

[0037] Preferably, the process of obtaining the equivalent unit corresponding to the a-th unit group includes:

[0038] The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

[0039] Compared with the closest prior art, the present invention has the following beneficial effects:

[0040] The technical solution provided by the present invention is to group new energy generator sets, and proposes a method and system for grouping new energy generator sets. By calculating the terminal voltage difference between the new energy generator set and the reference new energy generator set, the new energy generator sets are accurately grouped by comparing the voltage value with the threshold, thereby providing a basis for multi-machine modeling of the new energy generator set.

[0041] The present invention provides a method and system for grouping new energy generator sets that are applicable to both grid-connected new energy power station collection systems and new energy power station systems with different short-circuit capacities. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of a method for grouping new energy generator sets in an embodiment of the present invention;

[0043] Figure 2 It is a structural diagram of a grouping system of a new energy generator set in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0046] This embodiment provides a method for grouping new energy generator sets, such as Figure 1 As shown, the method includes:

[0047] Step 1. Initialize the new energy generator set number i=1 and the number of generator sets a=1, and the new energy generator set numbered 1 is the reference new energy generator set;

[0048] Step 2. Determine the terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set based on the output current of the new energy generator set numbered i;

[0049] Step 3. If the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is less than the threshold, the new energy generator set numbered i is assigned to the ath generator group and the process proceeds to step 4. Otherwise, the equivalent generator set corresponding to the ath generator group is used as the reference new energy generator set, a=a+1 is set, and the process returns to step 2.

[0050] Step 4. Determine whether there are any ungrouped new energy generators. If so, set i=i+1 and return to step 2. If not, output the grouping result.

[0051] Furthermore, before step 1, the following steps are included:

[0052] Number the new energy generating units connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line;

[0053] Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

[0054] Furthermore, the step 2 includes:

[0055] If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0;

[0056] Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n :

[0057]

[0058] In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set;

[0059] Among them, when a=1, c=1.

[0060] Furthermore, the process of obtaining the equivalent unit corresponding to the a-th cluster includes:

[0061] The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

[0062] This embodiment also provides a new energy generator grouping system based on the new energy generator group grouping method, such as Figure 2 As shown, the system includes:

[0063] An initialization unit is used to initialize the number of the new energy generator set i=1 and the number of the generator set a=1, and the new energy generator set numbered 1 is a reference new energy generator set;

[0064] a determining unit, configured to determine a terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set according to an output current of the new energy generator set numbered i;

[0065] A grouping unit is configured to, if the terminal voltage difference between the new energy generator group numbered i and the reference new energy generator group is less than a threshold value, group the new energy generator group numbered i into the a-th group and transfer the result to the judgment unit; otherwise, use the equivalent group corresponding to the a-th group as the reference new energy generator group, set a=a+1 and return to the determination unit;

[0066] The judgment unit is used to judge whether there are ungrouped new energy generator sets. If so, set i=i+1 and return to the determination unit. If not, output the grouping result.

[0067] Furthermore, the system further comprises:

[0068] A numbering unit, used to number the new energy generating sets connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line;

[0069] Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

[0070] Furthermore, the determining unit is specifically configured to:

[0071] If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0;

[0072] Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n :

[0073]

[0074] In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set;

[0075] Among them, when a=1, c=1.

[0076] Furthermore, the process of obtaining the equivalent unit corresponding to the a-th cluster includes:

[0077] The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

[0078] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0079] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 steps in the process. 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.

[0080] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for grouping new energy generator sets, characterized in that: The method comprises: Step 1. Initialize the new energy generator set number i=1 and the number of generator sets a=1, and the new energy generator set numbered 1 is the reference new energy generator set; Step 2. Determine the terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set based on the output current of the new energy generator set numbered i; Step 3. If the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is less than the threshold, the new energy generator set numbered i is assigned to the ath generator group and the process proceeds to step 4. Otherwise, the equivalent generator set corresponding to the ath generator group is used as the reference new energy generator set, a=a+1 is set, and the process returns to step 2. Step 4. Determine whether there are any ungrouped new energy generators. If so, set i = i + 1 and return to step 2. If not, output the grouping result. Wherein, the step 2 includes: If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0; Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n : In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set; Among them, when a=1, c=1.

2. The method according to claim 1, wherein Before step 1, the steps include: Number the new energy generating units connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line; Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

3. The method according to claim 1, wherein The process of obtaining the equivalent unit corresponding to the a-th cluster includes: The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

4. A grouping system for new energy generator sets, characterized in that: The system comprises: An initialization unit is used to initialize the number of the new energy generator set i=1 and the number of the generator set a=1, and the new energy generator set numbered 1 is a reference new energy generator set; a determining unit, configured to determine a terminal voltage difference between the new energy generator set numbered i and a reference new energy generator set according to an output current of the new energy generator set numbered i; A grouping unit is configured to, if the terminal voltage difference between the new energy generator group numbered i and the reference new energy generator group is less than a threshold value, group the new energy generator group numbered i into the a-th group and transfer the result to the judgment unit; otherwise, use the equivalent group corresponding to the a-th group as the reference new energy generator group, set a=a+1 and return to the determination unit; A judgment unit is used to judge whether there are ungrouped new energy generators. If so, set i=i+1 and return to the determination unit. If not, output the grouping result. The determining unit is specifically configured to: If i=1, the terminal voltage difference between the new energy generator set numbered i and the reference new energy generator set is 0; Otherwise, the terminal voltage difference ΔV between the new energy generator set numbered i and the reference new energy generator set is determined by the following formula: n : In the formula, c is the total number of new energy generator sets in the cluster that has completed clustering, I m is the output current of the mth new energy generator set, N is the total number of new energy generator sets, Z k is the equivalent impedance between the kth new energy generator set and the k+1th new energy generator set; Among them, when a=1, c=1.

5. The system according to claim 4, wherein: The system further comprises: A numbering unit, used to number the new energy generating sets connected to the collection line in sequence from the end point of the collection line to the starting point of the collection line; Wherein, the terminal of the collecting line is connected to the low-voltage side of the transformer substation.

6. The system according to claim 4, wherein: The process of obtaining the equivalent unit corresponding to the a-th cluster includes: The average of the terminal voltages of the new energy generator sets in the a-th group is equivalent to the terminal voltage of the equivalent group of the a-th group, and the sum of the output currents of the new energy generator sets in the a-th group is equivalent to the output current of the equivalent group of the a-th group.

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