Auxiliary impedance new energy field station equivalent aggregation method and system

Abstract

The application discloses a new energy field station auxiliary impedance equivalent aggregation method and system, comprising: a first network structure based on a wind power station, a standard network structure is constructed, and an equivalent aggregation method of the standard wind power station network structure is generated, wherein the current of the standard network structure increases in an arithmetic progression from far to near; a second network structure of the wind power station is normalized into the standard network structure, and the second network structure is subjected to equivalent aggregation through the equivalent aggregation method; through the implementation of the application, the scheme of manually calculating under different field station power collection line conditions is avoided, a large amount of time is saved, and the precision is improved. The application is suitable for new energy field stations with different power collection line connection methods, provides a normalized technical scheme for the new energy field stations, can be directly used for programmed efficient processing, improves equivalent calculation efficiency, and reduces manual calculation errors.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power grid simulation, in particular to an auxiliary impedance-based equivalent aggregation method and system for a new energy station. BACKGROUND

[0002] In the process of power grid simulation calculation, the new energy station part is mainly aggregated and equivalent, and the application is more consistent with the principle of ensuring the loss of the grid connection point. In the process, due to the complex and diverse collection lines in the new energy station, pure manual calculation wastes a lot of time and is prone to errors. For small power stations, manual derivation is still possible, but the applicability of widespread calculation is very limited. Therefore, a fast equivalent aggregation method needs to be researched according to the actual situation of the power station. Therefore, an auxiliary impedance-based equivalent aggregation method and system for a new energy station are urgently needed to meet the technical needs of the new energy station part. SUMMARY

[0003] In order to solve the above problems, the application provides an auxiliary impedance-based equivalent aggregation method and system for a new energy station, which is applied to the distribution of wind turbines under different types of collection lines, applies the basic theory of power systems, proposes a method of increasing auxiliary impedance, realizes the unification of unit distribution, and uses program calculation to achieve the purpose of accurate and fast equivalent aggregation.

[0004] In order to achieve the above technical purposes, the application provides an auxiliary impedance-based equivalent aggregation method for a new energy station, which comprises the following steps:

[0005] Based on the first network structure of the wind farm, a standard network structure is constructed, and an equivalent aggregation method for the standard wind farm network structure is generated, wherein the current of the standard network structure increases in an arithmetic progression from far to near;

[0006] The second network structure of the wind farm is normalized into a standard network structure, and the second network structure is equivalent aggregated by the equivalent aggregation method.

[0007] Preferably, in the process of constructing the standard network structure, each node of the first network structure is connected to only one unit, and each unit has different or same impedance.

[0008] Preferably, in the process of generating the equivalent aggregation method, the equivalent aggregation method is generated by current accumulation and impedance multiplication, and is used to obtain the total consumption of the standard network structure.

[0009] Preferably, in the process of obtaining the total consumption, the total consumption is represented as:

[0010] P=I 2 ×(R1+R2+R3+R5)+(2I) 2 ×R4+(3I)2 x(R6+R7);

[0011] Q=I 2 x(X1+X2+X3+X5)+(2I) 2 xX4+(3I) 2 x(X6+X7);

[0012] Wherein, the current of single machine is I, R represents resistance, X represents reactance, Z 1..7 =R 1..7 +X 1..7 , Z represents impedance.

[0013] Preferably, in the process of obtaining the second network structure, at least two units are connected to a node of the second network structure;

[0014] The second network structure is normalized into a standard network structure by adding a resistance between each two units.

[0015] Preferably, in the process of obtaining the second network structure, at least two units of the second network structure are connected to a node through a same resistance;

[0016] At least two units connected to a same node are taken as a unit, energy consumption is calculated through an equivalent aggregation method, impedance of each unit is distributed, and a resistance is added between each two units, so that the second network structure is normalized into a standard network structure.

[0017] Preferably, in the process of normalizing the second network structure, impedance of the added resistance is infinitely small, and loss is negligible.

[0018] The application further discloses a new energy field station equivalent aggregation system assisted by impedance.

[0019] A wind farm network generation module is configured to generate a first network structure and a second network structure of the wind farm.

[0020] A standard network structure construction module is configured to construct a standard network structure according to the first network structure, and generate an equivalent aggregation method of the standard wind farm network structure, wherein current of the standard network structure increases in an arithmetic progression from far to near.

[0021] A normalization module is configured to normalize the second network structure of the wind farm into the standard network structure, and perform equivalent aggregation on the second network structure through the equivalent aggregation method.

[0022] The application discloses the following technical effects:

[0023] Through implementation of the present application, the scheme of manual calculation under different power collection line conditions of the power station is avoided, a large amount of time is saved, and the precision is improved. The present application is suitable for new energy power stations with different power collection line connection methods, provides a normalized technical scheme, and can be directly used for programmed efficient processing, improves the equivalent calculation efficiency, and reduces the manual calculation error. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present application, and all other drawings obtained by those skilled in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0025] Figure 1 is a first type of power collection line equivalent diagram of the wind farm structure described in the present application;

[0026] Figure 2 is a second type of power collection line equivalent diagram of the wind farm structure described in the present application;

[0027] Figure 3 is a third type of power collection line equivalent diagram of the wind farm structure described in the present application;

[0028] Figure 4 is a first equivalent diagram of the second type of power collection line equivalent diagram described in the present application;

[0029] Figure 5 is a second equivalent diagram of the third type of power collection line equivalent diagram described in the present application;

[0030] Figure 6 is a new energy power station equivalent aggregation method flowchart described in the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0032] As Figures 1-6As shown, the application provides a new auxiliary impedance equivalent aggregation method for new energy station, comprising the following steps:

[0033] Based on the first network structure of the wind power station, a standard network structure is constructed, and an equivalent aggregation method of the standard wind power station network structure is generated, wherein the current of the standard network structure increases in an arithmetic progression from far to near;

[0034] The second network structure of the wind power station is normalized into a standard network structure, and the second network structure is equivalently aggregated by the equivalent aggregation method.

[0035] Further preferably, in the process of constructing the standard network structure, each node of the first network structure is connected to only one unit, and each unit has different or same impedance.

[0036] Further preferably, in the process of generating the equivalent aggregation method, the equivalent aggregation method is generated by current accumulation and impedance multiplication, and is used to obtain the total consumption of the standard network structure.

[0037] Further preferably, in the process of obtaining the total consumption, the total consumption is represented as:

[0038] P=I 2 ×(R1+R2+R3+R5)+(2I) 2 ×R4+(3I) 2 ×(R6+R7);

[0039] Q=I 2 ×(X1+X2+X3+X5)+(2I) 2 ×X4+(3I) 2 ×(X6+X7);

[0040] Wherein, the current of the single machine is I, R represents resistance, X represents reactance, Z 1..7 =R 1..7 +X 1..7 , and Z represents impedance.

[0041] Further preferably, in the process of obtaining the second network structure, at least two units are connected to one node of the second network structure;

[0042] The second network structure is normalized into a standard network structure by adding a resistance between each two units.

[0043] Further preferably, in the process of obtaining the second network structure, at least two units of the second network structure are connected to one node through the same resistance;

[0044] The at least two machines connected to the same node are taken as a group, the energy consumption is calculated through the equivalent aggregation method, then the impedance of each group is distributed, and a resistance is added between each two groups, and the second network structure is normalized into a standard network structure.

[0045] The second network structure mentioned in the application includes two cases, one case is that one node is connected with two or more groups through the same or different resistances, and the other case is that two or more groups are connected with the node through the same resistance; two or more can be understood as three, four or five; in the second network structure, a plurality of nodes are connected with two or more groups through the same or different resistances, and the second network structure includes a plurality of cases in which two or more groups are connected with the node through the same resistance.

[0046] Further preferably, in the process of normalizing the second network structure, the impedance of the added resistance is infinitely small, and the loss is negligible.

[0047] The application further discloses a new energy field station equivalent aggregation system with auxiliary impedance, which comprises:

[0048] A wind farm network generation module is configured to generate a first network structure and a second network structure of a wind farm.

[0049] A standard network structure construction module is configured to construct a standard network structure according to the first network structure, and generate an equivalent aggregation method of the standard wind farm network structure, wherein the current of the standard network structure increases in an arithmetic progression from far to near.

[0050] A normalization module is configured to normalize the second network structure of the wind farm into a standard network structure, and perform equivalent aggregation on the second network structure through an equivalent aggregation method.

[0051] The application further discloses a new energy field station equivalent aggregation device with auxiliary impedance, which comprises:

[0052] A wind farm structure equivalent function unit is configured to generate an equivalent diagram of each power collection line by collecting the power grid structure of the wind farm, and obtain a first network structure and a second network structure of the wind farm.

[0053] A standard network creation function unit is configured to construct a standard network structure from a first network structure unit with the structural characteristics of a standard trunk-type network structure of a composite wind farm, and generate an aggregation method for calculating the total energy consumption of the network according to the standard network structure, wherein the structural characteristics are represented as the current increases in an arithmetic progression from far to near.

[0054] The normalization function unit normalizes the second network structure unit, which does not conform to the structural characteristics of the standard trunk network structure, into the standard network structure, and calculates the total network energy consumption through the aggregation method.

[0055] The method for equivalent aggregation of auxiliary impedance of renewable energy power stations disclosed in this invention specifically includes the following process:

[0056] Step 1: Draw equivalent diagrams of each collector line based on the wind farm structure, mainly as follows: Figures 1-3 The three categories are:

[0057] (1) Ordinary trunk network structure, that is, each node is connected to only one unit, and the units are connected by impedance. The current increases in an arithmetic sequence from far to near.

[0058] (2) Single-node dual-machine network structure, that is, on the basis of ordinary trunk network structure, two wind turbines are connected at the same time in a certain node, which leads to the disruption of the regularity of current distribution.

[0059] (3) Single-node multi-machine network structure, that is, on the basis of ordinary trunk network structure, a branch is connected to a certain node. The branch also presents an ordinary trunk network, and the regularity of current distribution is destroyed.

[0060] Step 2: Targeting Figure 1 The structure can be calculated directly through programming. By accumulating the current and multiplying it by the impedance, if the current of a single machine is I, then the total loss is:

[0061] P = I 2 ×(R1+R2+R3+R5)+(2I) 2 ×R⁴+(3I) 2 ×(R6+R7); (1)

[0062] Q = I 2 ×(X1+X2+X3+X5)+(2I) 2 ×X4+(3I) 2 ×(X6+X7); (2)

[0063] Among them, Z 1..7 =R 1..7 +X 1..7 (3)

[0064] The above calculations are uniform and can be directly performed by a program, but for... Figure 2 , 3 Direct calculation is not supported; an equivalence step is required.

[0065] Step 3: Targeting Figure 2 Because the third and fourth machines are connected to the same point, they cannot be directly used.Figure 1 The scheme calculation can be made by adding a small resistance to form Figure 4 structure, which is normalized to Figure 1 equivalent diagram.

[0066] Similarly, the formula (1) (2) or program can be directly calculated by using formula (1) (2) or program:

[0067]

[0068]

[0069] Step 4: for Figure 3 , 3 machines and 4 machines should be calculated according to Figure 1 , and then the impedance is distributed to 1 / 2, and a small resistance is added to form Figure 5 structure.

[0070] According to the scheme of Figure 1 , the calculation is made:

[0071]

[0072]

[0073] Where, Z d1，d2 = R d1，d2 + X d1，d2 (8)

[0074] Z d2 = Z d1 = (I 2 × (Z6+Z7) + (2I) 2 × Z5) / I 2 / 2 (9)

[0075] Step 5: the new energy field station is arranged into a standard structure by adding a small auxiliary impedance. The small impedance can be infinitely small, and the loss generated by it can be ignored, but the structure can be unified, which is convenient for direct processing and calculation, and the PQ calculated is obtained.

[0076] The equivalent impedance is:

[0077] R = P / (NI) 2 (10)

[0078] X = Q / (NI) 2 (11)

[0079] By this method, the unified structure can be arranged, and the normalized programming calculation can be made according to the standardization mode of formula (1) (2), which can ensure the accuracy of the result, save time and improve efficiency.

[0080] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions of the flowchart block(s) or step(s) of the flowchart block(s). Figure 1 one or more of the flowchart or block diagrams. Figure 1 one or more of the flowchart or block diagrams.

[0081] In the description of the present application, it is to be understood that the terms "first", "second", "third" and the like, merely identify features belonging to distinct categories, and do not imply or imply a relative importance or a specific number thereof. Thus, a feature identified as "first", "second", or "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise expressly and specifically limited.

[0082] Obviously, various modifications and changes are possible in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present application embrace all such modifications and changes and, accordingly, the application is not to be limited by the foregoing description.

Claims

1. A method for equivalent aggregation of new energy stations with auxiliary impedance, characterized in that, The method comprises the following steps: Based on the first network structure of the wind farm, a standard network structure is constructed, and an equivalent aggregation method of the standard network structure is generated, wherein the current of the standard network structure increases regularly in an arithmetic progression from far to near; The second network structure of the wind farm is normalized into a standard network structure, and the second network structure is subjected to equivalent aggregation through the equivalent aggregation method; In the process of constructing the standard network structure, each node of the first network structure is connected with only one unit, and the units have different or same impedances; In the process of generating the equivalent aggregation method, the equivalent aggregation method is generated by multiplying the current accumulation by the impedance, and is used to obtain the total consumption of the standard network structure; In the process of obtaining the total consumption, the total consumption is represented as: wherein the current of the single machine is I, R represents the resistance, X represents the reactance, Z represents the impedance.

2. The auxiliary impedance new energy station equivalent aggregation method according to claim 1, wherein: In the process of obtaining the second network structure, at least two units are connected to one node of the second network structure; The second network structure is normalized into a standard network structure by adding a resistor between each two units.

3. The auxiliary impedance new energy station equivalent aggregation method according to claim 2, wherein: In the process of obtaining the second network structure, at least two units are connected to one node of the second network structure through the same resistor; The at least two units connected to the same node are regarded as one unit, and the energy consumption is calculated through the equivalent aggregation method, and then the impedance of each unit is distributed, and a resistor is added between each two units to normalize the second network structure into a standard network structure.

4. The auxiliary impedance new energy station equivalent aggregation method according to claim 2 or 3, wherein: In the process of normalizing the second network structure, the impedance of the added resistor is infinitesimal, and the loss is negligible.

5. The auxiliary impedance equivalent aggregation system of a new energy station, applied to the auxiliary impedance equivalent aggregation method of a new energy station in any of claims 1-4, characterized in that, The method comprises the following steps: A wind farm network generation module is configured to generate a first network structure and a second network structure of a wind farm; A standard network structure construction module is configured to construct a standard network structure according to the first network structure, and generate an equivalent aggregation method of the standard network structure, wherein the current of the standard network structure increases regularly in an arithmetic progression from far to near; A normalization module is configured to normalize the second network structure of the wind farm into a standard network structure, and subject the second network structure to equivalent aggregation through the equivalent aggregation method.

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