Method and device for evaluating voltage supporting capability of high-proportion new energy system

Abstract

The invention relates to the technical field of power system supporting capacity evaluation, in particular to a method and device for evaluating the voltage supporting capacity of a high-proportion new energy system, and the method comprises the steps: obtaining the grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system; calculating an MRSCR index value of each new energy grid-connected point in the high-proportion new energy system based on the grid structure parameter data, the equipment parameter data and the power data; based on the MRSCR index values of different new energy grid-connected points, calculating an MRSCR integrity index value, an MRSCR balance index value and an MRSCR safety index value of the high-proportion new energy system; and generating a voltage support capability comprehensive quantification result of the high-proportion new energy system according to the MRSCR integrity index value, the balance index value, the safety index value and the corresponding weights. Therefore, the problem that the accuracy of the voltage supporting capability of the high-proportion new energy system is low due to the fact that the mutual influence between the new energy grid-connected branches is not considered in the related technology is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power system support capability assessment, and in particular to a method and device for assessing the voltage support capability of a high-proportion new energy system. Background Art

[0002] Under the background of the "dual carbon" goal, new energy represented by wind power and photovoltaic power is developing rapidly. As the penetration rate of new energy in the system continues to increase, the system voltage support capacity is becoming increasingly unclear.

[0003] In the related technology, a comprehensive evaluation system for the voltage support capacity of new energy stations can be established, and based on the monitoring results of the grid-connected point voltage, it can be determined whether to start the comprehensive evaluation system for the voltage support capacity of new energy stations, thereby realizing a comprehensive evaluation of the voltage support capacity of the new energy grid-connected system; it is also possible to extract the equivalent reactive elasticity of the grid-connected converter based on the amplitude motion equation of the grid-connected converter under reactive disturbance by analogy with the expression of inertia in the synchronous machine rotor motion equation, and then quantitatively evaluate the voltage support capacity of the converter in the face of reactive disturbances, especially rapid reactive disturbances.

[0004] However, the relevant technology does not take into account the mutual influence between the new energy grid-connected branches, and the accuracy is low when used to evaluate the voltage support capacity of a high-proportion new energy system, which urgently needs to be improved. Summary of the invention

[0005] The present application provides a method and device for evaluating the voltage support capability of a high-proportion new energy system, in order to solve the problem that the mutual influence between new energy grid-connected branches is not considered in the related technology, resulting in low accuracy when evaluating the voltage support capability of a high-proportion new energy system.

[0006] The first aspect of the present application provides an evaluation method for the voltage support capability of a high-proportion new energy system, comprising the following steps: obtaining grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system; calculating the MRSCR (Multiple Renewable energy Stations Short Circuit Ratio) index value of each new energy grid-connected point in the high-proportion new energy system based on the grid structure parameter data, the equipment parameter data and the power data; calculating the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid-connected points; generating a comprehensive quantitative result of the voltage support capability of the high-proportion new energy system according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights.

[0007] Optionally, in one embodiment of the present application, the calculation of the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid-connected points includes: calculating the initial MRSCR integrity index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points and the total number of new energy grid-connected points in the high-proportion new energy system; calculating the initial MRSCR balance index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points and the initial MRSCR integrity index value; calculating the initial MRSCR safety index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points, the MRSCR critical values ​​of the different new energy grid-connected points and the total number of new energy grid-connected points; normalizing the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0008] Optionally, in one embodiment of the present application, the comprehensive quantitative result of the voltage support capability of the high-proportion new energy system is generated according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights, including: obtaining the weighting coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value based on the quantified importance values ​​among the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value; obtaining the comprehensive quantitative result of the voltage support capability according to the weighting coefficients, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0009] Optionally, in one embodiment of the present application, the calculation formula of the MRSCR index value of each new energy grid connection point may be, but is not limited to,:

[0010]

[0011] Among them, S i is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P i , P j are the input power of the new energy station grid connection points i and j respectively; Z ij is the mutual impedance of the new energy station grid connection points i and j; Z ii is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

[0012] Optionally, in one embodiment of the present application, the calculation formulas for the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value may be, but are not limited to,:

[0013]

[0014] Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

[0015] Optionally, in an embodiment of the present application, the calculation formula of the comprehensive quantification result of the voltage support capability may be, but is not limited to,:

[0016]

[0017] Among them, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint λ1+λ2+λ2=1.

[0018] The second aspect of the present application provides an evaluation device for the voltage support capability of a high-proportion new energy system, including: an acquisition module, used to acquire grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system; a first calculation module, used to calculate the MRSCR index value of each new energy grid-connected point in the high-proportion new energy system based on the grid structure parameter data, the equipment parameter data and the power data; a second calculation module, used to calculate the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid-connected points; a generation module, used to generate a comprehensive quantitative result of the voltage support capability of the high-proportion new energy system according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights.

[0019] Optionally, in one embodiment of the present application, the second calculation module includes: a first calculation unit, used to calculate the initial MRSCR integrity index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points and the total number of new energy grid-connected points in the high-proportion new energy system; a second calculation unit, used to calculate the initial MRSCR balance index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points and the initial MRSCR integrity index value; a third calculation unit, used to calculate the initial MRSCR safety index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid-connected points, the MRSCR critical values ​​of the different new energy grid-connected points and the total number of new energy grid-connected points; a normalization unit, used to normalize the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0020] Optionally, in one embodiment of the present application, the generation module includes: a first generation unit, used to obtain the weighting coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value based on the quantified values ​​of the importance between the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value; and a second generation unit, used to obtain the comprehensive quantification result of the voltage support capability based on the weighting coefficients, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0021] Optionally, in one embodiment of the present application, the calculation formula of the MRSCR index value of each new energy grid connection point may be, but is not limited to,:

[0022]

[0023] Among them, S i is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P i , P j are the input power of the new energy station grid connection points i and j respectively; Z ij is the mutual impedance of the new energy station grid connection points i and j; Z ii is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

[0024] Optionally, in one embodiment of the present application, the calculation formulas for the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value may be, but are not limited to,:

[0025]

[0026] Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

[0027] Optionally, in an embodiment of the present application, the calculation formula of the comprehensive quantification result of the voltage support capability may be, but is not limited to,:

[0028]

[0029] Among them, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint of λ1+λ2+λ3=1.

[0030] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for evaluating the voltage support capability of a high-proportion new energy system as described in the above embodiment.

[0031] The fourth aspect of the present application provides a computer-readable storage medium, which stores a computer program. When the program is executed by a processor, it implements the above-mentioned method for evaluating the voltage support capability of a high-proportion new energy system.

[0032] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, implements the above-mentioned method for evaluating the voltage support capability of a high-proportion new energy system.

[0033] The embodiment of the present application can calculate the MRSCR index value of each new energy grid connection point in the high-proportion new energy system based on the obtained grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system, and calculate the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid connection points, and then calculate the comprehensive quantitative results of the voltage support capacity of the high-proportion new energy system, measure the voltage support capacity of the high-proportion new energy system from the three perspectives of MRSCR integrity, balance and safety, and provide a theoretical basis for the voltage support capacity evaluation of the high-proportion new energy system. Thus, the problem that the mutual influence between the new energy grid-connected branches is not considered in the related art, resulting in low accuracy when used to evaluate the voltage support capacity of the high-proportion new energy system, is solved.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0036] Figure 1 A flowchart of a method for evaluating voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of an improved IEEE (Institute of Electrical and Electronics Engineers) 39-node system provided according to an embodiment of the present application;

[0038] Figure 3 A block diagram of a method for constructing a comprehensive quantitative index of voltage support capability according to an embodiment of the present application;

[0039] Figure 4 A block diagram showing a comparison of comprehensive quantitative results of voltage support capabilities after connecting different numbers of synchronous condensers according to an embodiment of the present application;

[0040] Figure 5 A flowchart of the working principle of a method for evaluating the voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application;

[0041] Figure 6 A block diagram of a device for evaluating voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application;

[0042] Figure 7 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0044] The following describes the evaluation method and device of the voltage support capacity of the high-proportion new energy system of the embodiment of the present application with reference to the accompanying drawings. In view of the problem mentioned in the above background technology that the mutual influence between the new energy grid-connected branches is not considered, resulting in low accuracy when used to evaluate the voltage support capacity of the high-proportion new energy system, the present application provides a method for evaluating the voltage support capacity of the high-proportion new energy system, in which the MRSCR index value of each new energy grid-connected point in the high-proportion new energy system can be calculated based on the obtained grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system, and the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system are calculated based on the MRSCR index values ​​of different new energy grid-connected points, and then the comprehensive quantitative result of the voltage support capacity of the high-proportion new energy system is calculated, and the voltage support capacity of the high-proportion new energy system is measured from the three perspectives of MRSCR integrity, balance and safety, providing a theoretical basis for the voltage support capacity evaluation of the high-proportion new energy system. Thus, the problem that the mutual influence between the new energy grid-connected branches is not considered in the related technology, resulting in low accuracy when used to evaluate the voltage support capacity of the high-proportion new energy system, etc., is solved.

[0045] Specifically, Figure 1 The present invention is a flowchart of a method for evaluating the voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application.

[0046] like Figure 1 As shown, the evaluation method of the voltage support capability of the high-proportion new energy system includes the following steps:

[0047] In step S101, grid structure parameter data, equipment parameter data and power data of a high-proportion new energy system are obtained.

[0048] It can be understood that the grid structure parameter data describes the connection relationship and physical characteristics of each node, line and transformer in the new energy system, which may include but is not limited to: node parameters, such as: node type, node number of each node, etc.; line parameters, such as: physical length of the line, resistance and reactance of the line, etc.; transformer parameters, such as: impedance value of the transformer, etc., and this application does not make specific restrictions.

[0049] Furthermore, in the embodiments of the present application, the equipment parameter data describes the physical characteristics and operating characteristics of each device in the new energy system, which may include but is not limited to: wind turbine power generation parameters, such as: rated power of wind turbine generator, etc.; energy storage equipment parameters, such as: charging and discharging power, charging and discharging efficiency, etc., and the present application does not impose specific restrictions.

[0050] Furthermore, in the embodiments of the present application, the power data describes the output power of each device in the new energy system and the power demand of the load, which may include but is not limited to: power generation power; load power, etc., and the present application does not impose specific restrictions.

[0051] As a possible implementation method, the embodiment of the present application can obtain the grid structure parameter data, equipment parameter data and power data of a high-proportion new energy system. The specific settings can be made by technical personnel in this field according to actual conditions, and this application does not impose any specific restrictions.

[0052] Exemplarily, the high-proportion new energy system of the embodiment of the present application can be an improved IEEE 39 node system, that is, two synchronous generator sets (G4 on Bus33, G6 on Bus35) are changed to synchronous phase condensers (S1-S2) for operation, and four wind farms (WF1-WF4) and four photovoltaic power stations (PV1-PV4) are added. In the embodiment of the present application, the transformer, load and line parameters in the improved IEEE 39 node system adopt standard IEEE 39 test system data, and its schematic diagram is as follows Figure 2 shown.

[0053] In step S102, the MRSCR index value of each new energy grid connection point in the high-proportion new energy system is calculated based on the grid structure parameter data, the equipment parameter data and the power data. The calculation formula of the MRSCR index value of each new energy grid connection point can be but is not limited to:

[0054]

[0055] Among them, S i is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P i , P j are the input power of the new energy station grid connection points i and j respectively; Z ijis the mutual impedance of the new energy station grid connection points i and j; Z uu is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

[0056] In some embodiments, the embodiment of the present application can use the calculation formula of the MRSCR index value of each new energy grid-connected point to calculate the MRSCR index value of each new energy grid-connected point, which mainly includes: grid structure parameter data, equipment parameter data and power data, etc. This application does not make specific restrictions.

[0057] Among them, in the embodiment of the present application, the calculation formula of the MRSCR index value of the i-th new energy grid connection point can be but is not limited to:

[0058]

[0059] Among them, S u is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P u , P j are the input power of the new energy station grid connection points i and j respectively; Z ij is the mutual impedance of the new energy station grid connection points i and j; Z ii is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

[0060] In step S103, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value of the high-proportion new energy system are calculated based on the MRSCR index values ​​of different new energy grid connection points.

[0061] As a possible implementation method, the embodiment of the present application can calculate the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of a high-proportion new energy system.

[0062] Optionally, in one embodiment of the present application, the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of a high-proportion new energy system are calculated based on the MRSCR index values ​​of different new energy grid-connected points, including: calculating the initial MRSCR integrity index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid-connected points and the total number of new energy grid-connected points in the high-proportion new energy system; calculating the initial MRSCR balance index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid-connected points and the initial MRSCR integrity index value; calculating the initial MRSCR safety index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid-connected points, the MRSCR critical values ​​of different new energy grid-connected points and the total number of new energy grid-connected points; normalizing the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value. The calculation formulas for the MRSCR integrity index value, the MRSCR balance index value, and the MRSCR safety index value may be, but are not limited to, the following:

[0063]

[0064] Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

[0065] In some embodiments, the integrity index of the embodiment of the present application reflects the overall voltage support capability of the system, which is obtained by averaging the MRSCR index values ​​of each node. In the embodiment of the present application, the calculation formula of the initial MRSCR integrity index value can be but is not limited to:

[0066]

[0067] Among them, I sum is the overall indicator of the system voltage support capability; N is the total number of nodes in the system; MRSCR i is the short-circuit ratio index value of the new energy multi-station at node i.

[0068] In some embodiments, the balance index of the embodiment of the present application reflects the balance of the voltage support capabilities of different nodes relative to the MRSCR overall index. In the embodiment of the present application, the calculation formula of the initial MRSCR balance index value can be but is not limited to:

[0069]

[0070] Among them, I baI It is an indicator of the balance of system voltage support capacity.

[0071] In some embodiments, the safety index of the embodiment of the present application reflects the safety margin of the node voltage support capability, wherein, in the embodiment of the present application, the calculation formula of the initial MRSCR safety index value may be but is not limited to:

[0072]

[0073] Among them, I saf MRSCR is the safety index of system voltage support capability; i,min is the critical MRSCR value of grid connection point i.

[0074] Further, in the embodiment of the present application, since the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value have different monotonic directions, dimensions and orders of magnitude, in order to unify the standards, the three index data are normalized by using the range change method, and then the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value are obtained. Among them, the calculation formulas of the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value can be, but are not limited to, as follows:

[0075]

[0076] Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

[0077] In step S104, the voltage support capability comprehensive quantitative result of the high-proportion new energy system is generated according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights. The calculation formula of the voltage support capability comprehensive quantitative result can be but is not limited to:

[0078]

[0079] Among them, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint of λ1+λ2+λ3=1.

[0080] Those skilled in the art can understand that the embodiment of the present application can use the relative weighted coefficient method to obtain the comprehensive quantitative result of the voltage support capability of the high-proportion new energy system, as shown in the schematic diagram. Figure 3 As shown, the main contents include:

[0081] The MRSCR integrity index value, MRSCR balance index value, and MRSCR safety index value are linearly weighted and summed to obtain the comprehensive quantitative results of the voltage support capacity of the high-proportion new energy system. The calculation formula for the comprehensive quantitative results of the voltage support capacity can be, but is not limited to,:

[0082]

[0083] Among them, I S is a comprehensive quantitative indicator of the system voltage support capability, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint λ1+λ2+λ3=1.

[0084] For example, Figure 4 As shown, the embodiment of the present application changes the voltage support capacity of the sending-end system by connecting different numbers of synchronous phase regulators, calculates the comprehensive quantitative results of the voltage support capacity of the connected different numbers of synchronous phase regulators, and then obtains a comparison result of the comprehensive quantitative results of the voltage support capacity.

[0085] In addition, the embodiment of the present application also provides a comprehensive quantitative result of the voltage support capability when different numbers of synchronous condensers are connected. Table 1 is a schematic table of the comprehensive quantitative result of the voltage support capability when different numbers of synchronous condensers are connected according to an embodiment of the present application.

[0086] Table 1

[0087]

[0088]

[0089] Through analysis, it can be seen that in the improved IEEE 39-node system, the MRSCR integrity index value, MRSCR balance index value, and MRSCR safety index value under the non-phase condenser access scheme of the embodiment of the present application are the worst, and the calculated comprehensive quantification result of the voltage support capacity is 0.475. Considering the synchronous condenser S1 access scheme, the calculated comprehensive quantification result of the voltage support capacity is 0.611, which is 28.63% higher than the comprehensive quantification result of the voltage support capacity of the non-phase condenser access scheme. Considering the synchronous condenser S2 access scheme, the calculated comprehensive quantification result of the voltage support capacity is 0.703, which is 48.00% higher than the comprehensive quantification result of the voltage support capacity of the non-phase condenser access scheme. Considering the synchronous condenser S1 / S2 access scheme, the MRSCR integrity index value, MRSCR balance index value, and MRSCR safety index value are all optimal, and the calculated comprehensive quantification result of the voltage support capacity is 0.728, which is 53.26% higher than the comprehensive quantification result of the voltage support capacity of the non-phase condenser access scheme.

[0090] Optionally, in one embodiment of the present application, a comprehensive quantitative result of the voltage support capability of a high-proportion new energy system is generated based on the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights, including: obtaining weighting coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value based on the importance quantification values ​​between the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value; obtaining a comprehensive quantitative result of the voltage support capability based on the weighting coefficients, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0091] As a possible implementation method, the embodiment of the present application generates the weighted coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value, and the MRSCR safety index value, which mainly include:

[0092] Among them, in the embodiment of the present application, the relative weighted coefficient method is used to determine the weighted coefficients of different indicators, and the importance relationship characteristics between different indicators of MRSCR are comprehensively considered. Further, the weighted coefficient calculation formula of different indicators in the embodiment of the present application can be but is not limited to:

[0093]

[0094] Among them, λ i is the weight coefficient of the i-th indicator; ij is the quantitative value of the importance of the i-th indicator relative to the j-th indicator, λ ij +λ ji =1(i≠j),λii =0; M is the total number of indicators, M=3.

[0095] Furthermore, the embodiment of the present application can obtain a comprehensive quantitative result of the voltage support capability based on the weighting coefficient, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0096] The working principle of the method for evaluating the voltage support capability of a high-proportion new energy system proposed in the embodiment of the present application is described in detail below in conjunction with a specific embodiment.

[0097] in, Figure 5 The present invention is a flow chart showing the working principle of a method for evaluating the voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application.

[0098] Step S501: Acquire grid structure parameter data, equipment parameter data and power data of a high-proportion new energy system.

[0099] Among them, Figure 2 As shown, the embodiment of the present application can obtain the grid structure parameter data, equipment parameter data and power data of the improved IEEE 39-node system, and the present application does not impose any specific restrictions.

[0100] Step S502: Calculate the MRSCR index value of each new energy grid connection point.

[0101] Among them, the embodiment of the present application can use the calculation formula of the MRSCR index value of each new energy grid-connected point to calculate the MRSCR index value of each new energy grid-connected point.

[0102] Step S503: Calculate the initial MRSCR integrity index value, the initial MRSCR balance index value, and the initial MRSCR safety index value.

[0103] Among them, the embodiments of the present application can respectively use the calculation formula of the initial MRSCR integrity index value, the calculation formula of the initial MRSCR balance index value, and the calculation formula of the initial MRSCR safety index value to calculate the initial MRSCR integrity index value, the initial MRSCR balance index value, and the initial MRSCR safety index value.

[0104] Step S504: unify the indicators of the three dimensions through normalization.

[0105] Among them, the embodiment of the present application can unify the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value by normalization to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0106] Step S505: using the relative weighted coefficient method to obtain a comprehensive quantitative result of the voltage support capability of the high-proportion new energy system.

[0107] Among them, the embodiment of the present application can use the relative weighted coefficient method to obtain the comprehensive quantitative result of the voltage support capability of the high-proportion new energy system, as shown in the schematic diagram Figure 3 shown.

[0108] Furthermore, if Figure 4 As shown, the embodiment of the present application can change the voltage support capacity of the sending-end system by connecting different numbers of synchronous phase regulators, calculate the comprehensive quantitative results of the voltage support capacity of the connected different numbers of synchronous phase regulators, and then obtain a comparison result of the comprehensive quantitative results of the voltage support capacity.

[0109] According to the evaluation method of the voltage support capacity of a high-proportion new energy system proposed in the embodiment of the present application, the MRSCR index value of each new energy grid-connected point in the high-proportion new energy system can be calculated based on the obtained grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system, and the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system can be calculated based on the MRSCR index values ​​of different new energy grid-connected points, and then the comprehensive quantitative result of the voltage support capacity of the high-proportion new energy system is calculated, and the voltage support capacity of the high-proportion new energy system is measured from the three perspectives of MRSCR integrity, balance and safety, providing a theoretical basis for the evaluation of the voltage support capacity of the high-proportion new energy system. Thus, the problem that the mutual influence between the new energy grid-connected branches is not considered in the related art, resulting in low accuracy when used to evaluate the voltage support capacity of the high-proportion new energy system is solved.

[0110] Next, a device for evaluating the voltage support capability of a high-proportion new energy system proposed in an embodiment of the present application will be described with reference to the accompanying drawings.

[0111] Figure 6 A block diagram of a device for evaluating the voltage support capability of a high-proportion new energy system provided according to an embodiment of the present application.

[0112] like Figure 6 As shown, the device 10 for evaluating the voltage support capability of a high-proportion new energy system includes: an acquisition module 100 , a first calculation module 200 , a second calculation module 300 and a generation module 400 .

[0113] The acquisition module 100 is used to acquire the grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system.

[0114] The first calculation module 200 is used to calculate the MRSCR index value of each new energy grid connection point in the high-proportion new energy system based on the grid structure parameter data, equipment parameter data and power data.

[0115] The second calculation module 300 is used to calculate the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid connection points.

[0116] The generation module 400 is used to generate a comprehensive quantitative result of the voltage support capability of a high-proportion new energy system according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights.

[0117] Optionally, in one embodiment of the present application, the second calculation module 300 includes: a first calculation unit, a second calculation unit, a third calculation unit and a normalization unit.

[0118] Among them, the first calculation unit is used to calculate the initial MRSCR integrity index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid-connected points and the total number of new energy grid-connected points in the high-proportion new energy system.

[0119] The second calculation unit is used to calculate the initial MRSCR balance index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid connection points and the initial MRSCR integrity index value.

[0120] The third calculation unit is used to calculate the initial MRSCR safety index value of the high-proportion new energy system according to the MRSCR index values ​​of different new energy grid-connected points, the MRSCR critical values ​​of different new energy grid-connected points and the total number of new energy grid-connected points.

[0121] The normalization unit is used to normalize the initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0122] Optionally, in one embodiment of the present application, the generation module 400 includes: a first generation unit and a second generation unit.

[0123] Among them, the first generation unit is used to obtain the weighting coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value based on the quantified importance values ​​among the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0124] The second generating unit is used to obtain a comprehensive quantitative result of the voltage support capability according to the weighting coefficient, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

[0125] Optionally, in one embodiment of the present application, the calculation formula of the MRSCR index value of each new energy grid connection point may be, but is not limited to,:

[0126]

[0127] Among them, S i is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P i , P j are the input power of the new energy station grid connection points i and j respectively; Z ij is the mutual impedance of the new energy station grid connection points i and j; Z ii is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

[0128] Optionally, in one embodiment of the present application, the calculation formulas for the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value may be, but are not limited to,:

[0129]

[0130] Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

[0131] Optionally, in one embodiment of the present application, the calculation formula of the comprehensive quantification result of the voltage support capability may be, but is not limited to,:

[0132]

[0133] Among them, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint of λ1+λ2+λ3=1.

[0134] It should be noted that the above explanation of the embodiment of the method for evaluating the voltage support capability of a system with a high proportion of new energy is also applicable to the device for evaluating the voltage support capability of a system with a high proportion of new energy in this embodiment, and will not be repeated here.

[0135] According to the evaluation device of the voltage support capacity of a high-proportion new energy system proposed in the embodiment of the present application, the MRSCR index value of each new energy grid-connected point in the high-proportion new energy system can be calculated based on the grid structure parameter data, equipment parameter data and power data of the high-proportion new energy system, and the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system can be calculated based on the MRSCR index values ​​of different new energy grid-connected points, and then the comprehensive quantitative result of the voltage support capacity of the high-proportion new energy system is calculated, and the voltage support capacity of the high-proportion new energy system is measured from the three perspectives of MRSCR integrity, balance and safety, providing a theoretical basis for the evaluation of the voltage support capacity of the high-proportion new energy system. Thus, the problem that the mutual influence between the new energy grid-connected branches is not considered in the related art, resulting in low accuracy when used to evaluate the voltage support capacity of the high-proportion new energy system is solved.

[0136] Figure 7 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. The electronic device may include:

[0137] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0138] When the processor 702 executes the program, the method for evaluating the voltage support capability of a high-proportion new energy system provided in the above embodiment is implemented.

[0139] Furthermore, the electronic device further comprises:

[0140] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0141] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0142] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0143] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0144] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0145] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0146] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for evaluating the voltage support capability of a high-proportion new energy system.

[0147] An embodiment of the present application also provides a computer program product, including a computer program, which, when executed, implements the above-mentioned method for evaluating the voltage support capability of a high-proportion new energy system.

[0148] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0149] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0150] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0151] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0152] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0153] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0154] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0155] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for evaluating the voltage support capability of a high-proportion new energy system, characterized in that: The following steps are involved: Obtain grid structure parameter data, equipment parameter data and power data of high-proportion new energy systems; Calculate the new energy multi-station short circuit ratio MRSCR index value of each new energy grid connection point in the high-proportion new energy system based on the grid structure parameter data, the equipment parameter data and the power data; Calculate the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid connection points; A comprehensive quantitative result of the voltage support capability of the high-proportion new energy system is generated according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights.

2. The method according to claim 1, characterized in that The calculation of the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid connection points includes: Calculate the initial MRSCR integrity index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid connection points and the total number of new energy grid connection points in the high-proportion new energy system; Calculating the initial MRSCR balance index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid connection points and the initial MRSCR integrity index value; Calculate the initial MRSCR safety index value of the high-proportion new energy system according to the MRSCR index values ​​of the different new energy grid connection points, the MRSCR critical values ​​of the different new energy grid connection points and the total number of the new energy grid connection points; The initial MRSCR integrity index value, the initial MRSCR balance index value and the initial MRSCR safety index value are normalized to obtain the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value.

3. The method according to claim 1, characterized in that The generating of the comprehensive quantitative result of the voltage support capability of the high-proportion new energy system according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights includes: Based on the quantified importance values ​​among the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value, weighting coefficients corresponding to the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value are obtained; According to the weighting coefficient, the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value, a comprehensive quantitative result of the voltage support capability is obtained.

4. The method according to claim 1, characterized in that The calculation formula of the MRSCR index value of each new energy grid connection point is: Among them, S i is the actual short-circuit capacity of the grid-connected point of the i-th new energy station; P i , P j are the input power of the new energy station grid connection points i and j respectively; Z ij is the mutual impedance of the new energy station grid connection points i and j; Z ii is the self-impedance of the new energy station grid connection point i; N is the total number of nodes in the system.

5. The method according to claim 1, characterized in that The calculation formulas for the MRSCR integrity index value, the MRSCR balance index value and the MRSCR safety index value are as follows: Among them, I sum ,I baI ,I saf They are the calculated voltage support capacity integrity index value, balance index value, and safety index value respectively; They are the integrity, balance and safety index values ​​of the system voltage support capacity after unified standards; the subscripts min and max are the maximum and minimum values ​​corresponding to each index respectively.

6. The method according to claim 1, characterized in that The calculation formula of the comprehensive quantitative result of the voltage support capability is: Among them, λ1, λ2, and λ3 are weighted coefficients of different indicators, and satisfy the constraint of λ1+λ2+λ3=1.

7. An evaluation device for voltage support capability of a high-proportion new energy system, characterized in that: include: An acquisition module is used to acquire grid structure parameter data, equipment parameter data and power data of a high-proportion new energy system; A first calculation module is used to calculate the MRSCR index value of each new energy grid connection point in the high-proportion new energy system based on the grid structure parameter data, the equipment parameter data and the power data; A second calculation module is used to calculate the MRSCR integrity index value, MRSCR balance index value and MRSCR safety index value of the high-proportion new energy system based on the MRSCR index values ​​of different new energy grid connection points; A generation module is used to generate a comprehensive quantitative result of the voltage support capability of the high-proportion new energy system according to the MRSCR integrity index value, the MRSCR balance index value, the MRSCR safety index value and the corresponding weights.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for evaluating the voltage support capability of a high-proportion new energy system as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for evaluating the voltage support capability of a high-proportion new energy system as described in any one of claims 1-6.

10. A computer program product, characterized in that It comprises a computer program which, when executed, is used to implement the method for evaluating the voltage support capability of a high-proportion new energy system as described in any one of claims 1-6.

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