New energy power grid modeling method and device, storage medium and computing equipment

Abstract

The embodiment of the invention provides a new energy power grid modeling method and device, a storage medium and computing equipment. The new energy power grid modeling method comprises the steps that new energy power grid parameters are acquired; generating influence factors based on the new energy power grid parameters; determining the power grid equivalent model as a simplified model according to the new energy power grid parameters and the influence factors based on the influence factors smaller than or equal to the influence factor threshold; or on the basis that the influence factor is larger than the influence factor threshold value, the power grid equivalent model is determined to be a detailed model according to the obtained new energy control strategy type, and therefore the influence of the new energy power grid parameters on the research area can be quantified into the influence factor, and the influence factor is compared with the influence factor threshold value; and determining that the power grid equivalent model is a simplified model or a detailed model, thereby establishing the simplified model or the detailed model according to conditions, and realizing accurate equivalent modeling of the new energy station.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of power grid technology, and in particular to a new energy power grid modeling method. Background Art

[0002] Internal overvoltage calculation is an important guarantee for the commissioning of ultra-high voltage / ultra-high voltage transmission and transformation engineering systems. After the ultra-high voltage / ultra-high voltage project is completed and before it is started, the internal overvoltage calculation can be used to calculate the overvoltage caused by the capacity rise effect of the empty charging line during the commissioning process. This is an important means to ensure that the voltage at the end of the line does not exceed the voltage specified in the regulations. If the terminal voltage exceeds the insulation tolerance limit, the method of calculating and controlling the bus voltage at the head end can be used to prevent disasters before they happen. Traditional internal overvoltage calculations usually use the Thevenin equivalent method to simplify the power grid, that is, the entire system is divided into two parts: the internal system and the external system, and the external system is simplified by the Thevenin equivalent, and then the PSCAD software is used to perform electromagnetic transient analysis on local areas of large-scale power systems.

[0003] However, with the integration of a high proportion of renewable energy into the power grid, the structure and operation characteristics of the power grid have undergone major changes. At present, the traditional Thevenin equivalent method can no longer accurately model renewable energy stations. The calculation results of the bus voltage control value of the electromagnetic transient calculation are significantly different from the results of the electromechanical transient calculation. This is because in the scenario of large-scale centralized access of renewable energy to the power grid, when calculating the overvoltage in the power grid for the newly built startup project, if only the Thevenin equivalent modeling is performed on the renewable energy collection station or the nearby station, and the renewable energy is directly equivalent to the Thevenin model of the voltage source and impedance, due to the current source characteristics of renewable energy, the equivalent voltage value will be inaccurate or the impedance value will be negative. In the steady state, the equivalent power grid model flow does not correspond to the actual power grid flow. Therefore, the traditional overvoltage calculation method is no longer suitable for analyzing all scenarios of large-scale renewable energy access to the power grid. It is necessary to study the equivalent modeling method of the internal overvoltage calculation of the power grid in the scenario of large-scale access of renewable energy. Summary of the invention

[0004] In view of this, the embodiments of this specification provide a new energy grid modeling method. One or more embodiments of this specification also relate to a new energy grid modeling device, a computing device, and a computer-readable storage medium to solve the technical defects existing in the prior art.

[0005] According to a first aspect of an embodiment of this specification, a new energy grid modeling method is provided, including: Obtain new energy grid parameters; generating an impact factor based on the new energy grid parameters; Based on the fact that the impact factor is less than or equal to the impact factor threshold, the grid equivalent model is determined to be a simplified model according to the new energy grid parameters and the impact factor; or, based on the fact that the impact factor is greater than the impact factor threshold, the grid equivalent model is determined to be a detailed model according to the acquired new energy control strategy type.

[0006] In a possible implementation, the new energy control strategy type includes a grid-following type or a grid-building type, and the detailed model includes a site model or a virtual impedance voltage source model; Correspondingly, based on the fact that the impact factor is greater than the impact factor threshold, determining the power grid equivalent model as a detailed model according to the acquired new energy control strategy type includes: Based on the fact that the impact factor is greater than the impact factor threshold, and according to the fact that the new energy control strategy type is the grid-following type, determining that the grid equivalent model is the station model; or, Based on the fact that the impact factor is greater than the impact factor threshold, and according to the fact that the new energy control strategy type is the grid type, it is determined that the grid equivalent model is the virtual impedance voltage source model.

[0007] In a possible implementation, the new energy grid parameter includes a reactive power output parameter, and the simplified model includes a capacitor model, an inductor model or a Thevenin model; Correspondingly, based on the fact that the impact factor is less than or equal to the impact factor threshold, determining the grid equivalent model as a simplified model according to the new energy grid parameter and the impact factor includes: Based on the fact that the impact factor is equal to a first threshold value, and according to the fact that the reactive output parameter is greater than a reactive output threshold value, determining that the grid equivalent model is the capacitor model, wherein the first threshold value is less than or equal to the impact factor threshold value; or, Based on the fact that the impact factor is equal to the first threshold and the reactive output parameter is less than or equal to the reactive output threshold, determining that the grid equivalent model is the inductance model; or, Based on the fact that the impact factor is less than or equal to the impact factor threshold and is not equal to the first threshold, it is determined that the power grid equivalent model is the Thevenin model.

[0008] In a possible implementation, the capacitance model includes a capacitance load parameter; Correspondingly, after determining that the power grid equivalent model is the capacitance model, the method further includes: Based on the reactive power output parameter, determining the capacitive load parameter; The capacitance model is generated based on the capacitance load parameter.

[0009] In a possible implementation, the inductance model includes an inductance load parameter; Correspondingly, after determining that the power grid equivalent model is the inductance model, the method further includes: Based on the reactive power output parameter, determining the inductive load parameter; The inductance model is generated based on the inductive load parameters.

[0010] In a possible implementation, the new energy grid parameters include active output parameters, access distance parameters and grid short-circuit capacity parameters; Accordingly, the generating of the influencing factor based on the new energy grid parameter includes: Based on the access distance parameter being equal to the distance threshold, generating the impact factor according to the active output parameter and the grid short-circuit capacity parameter; or, Based on the fact that the access distance parameter is not equal to the distance threshold, the impact factor is generated according to the active output parameter, the access distance parameter and the grid short-circuit capacity parameter.

[0011] In a possible implementation, after determining that the power grid equivalent model is a simplified model according to the new energy power grid parameter and the influencing factor or determining that the power grid equivalent model is a detailed model according to the acquired new energy control strategy type, the method further includes: Generating a power grid operation prediction value based on the power grid equivalent model, wherein the power grid equivalent model includes the simplified model or the detailed model; Obtain actual values ​​of power grid operation; Based on the matching of the predicted operation value of the power grid and the actual operation value of the power grid, the power grid equivalent model is run; or, based on the mismatch between the predicted operation value of the power grid and the actual operation value of the power grid, the step of obtaining the new energy power grid parameters is executed.

[0012] According to a second aspect of an embodiment of this specification, a new energy grid modeling device is provided, comprising: A first acquisition module is configured to acquire new energy grid parameters; A first generating module is configured to generate an impact factor based on the new energy grid parameter; The first determination module is configured to determine that the power grid equivalent model is a simplified model based on the new energy power grid parameters and the influence factor based on the influence factor being less than or equal to the influence factor threshold; or, based on the influence factor being greater than the influence factor threshold, determine that the power grid equivalent model is a detailed model based on the acquired new energy control strategy type.

[0013] According to a third aspect of an embodiment of this specification, a computing device is provided, including: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the above-mentioned new energy power grid modeling method are implemented.

[0014] According to a fourth aspect of the embodiments of this specification, a computer-readable storage medium is provided, which stores computer-executable instructions, and when the instructions are executed by a processor, the steps of the above-mentioned new energy power grid modeling method are implemented.

[0015] An embodiment of the present specification implements a new energy power grid modeling method, apparatus, storage medium and computing equipment to obtain new energy power grid parameters; generate an impact factor based on the new energy power grid parameters; based on the impact factor being less than or equal to the impact factor threshold, determine that the power grid equivalent model is a simplified model according to the new energy power grid parameters and the impact factor; or, based on the impact factor being greater than the impact factor threshold, determine that the power grid equivalent model is a detailed model according to the acquired new energy control strategy type, so that the impact of the new energy power grid parameters on the studied area can be quantified as an impact factor, and the impact factor is compared with the impact factor threshold to determine whether the power grid equivalent model is a simplified model or a detailed model, and then establish a simplified model or a detailed model according to different situations to achieve accurate equivalent modeling of new energy sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flow chart of a new energy grid modeling method provided by an embodiment of this specification; Figure 2 It is a classification modeling schematic diagram provided by an embodiment of this specification; Figure 3 It is a connection diagram provided by an embodiment of this specification; Figure 4 It is a structural schematic diagram of a new energy grid modeling device provided by an embodiment of this specification; Figure 5 It is a structural block diagram of a computing device provided by an embodiment of this specification. DETAILED DESCRIPTION

[0017] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0018] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0019] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0020] Figure 1 is a flow chart of a new energy grid modeling method provided by an embodiment of this specification, such as Figure 1 As shown, the method includes: Step 101: The computing device obtains new energy grid parameters.

[0021] In some embodiments, the computing device includes but is not limited to a server, a laptop computer, a desktop computer, a tablet or a wearable device. The new energy grid parameters are parameters related to new energy for detecting the power grid. The present invention is applicable to scenarios where new energy is connected to the power grid, and is particularly applicable to scenarios where a high proportion of new energy is connected to the power grid. The new energy grid parameters include at least one of the parameters such as the active output of new energy, the distance between the new energy collection access location and the study area, and the short-circuit capacity of the power grid at the new energy connection point. The new energy grid parameters may also include the reactive output of new energy and / or the type of new energy control strategy, wherein the type of new energy control strategy includes a grid-following type or a grid-building type.

[0022] Step 102: The computing device generates an impact factor based on the new energy grid parameters.

[0023] In some embodiments, the impact of the new energy grid parameters on the studied area is quantified as an impact factor k.

[0024] Step 103: The computing device determines that the grid equivalent model is a simplified model based on the new energy grid parameters and the impact factor, based on the impact factor being less than or equal to the impact factor threshold; or, based on the impact factor being greater than the impact factor threshold, determines that the grid equivalent model is a detailed model based on the acquired new energy control strategy type.

[0025] In some embodiments, when the new energy grid parameter includes the new energy control strategy type, the computing device may directly extract the new energy control strategy type from the new energy grid parameter.

[0026] The larger the impact factor k is, the greater the impact is. The computing device determines whether the power grid equivalent model to be created is a simplified model or a detailed model based on different situations. When the impact factor is less than or equal to the impact factor threshold, it means that the new energy grid parameters have little impact on the studied area, and the computing device only needs to establish a simplified model to achieve accurate equivalent modeling of the new energy station; when the impact factor is greater than the impact factor threshold, it means that the new energy grid parameters have a greater impact on the studied area, and the computing device needs to establish a detailed model to achieve accurate equivalent modeling of the new energy station.

[0027] The present specification provides a new energy power grid modeling method, which obtains new energy power grid parameters; generates an impact factor based on the new energy power grid parameters; based on the impact factor being less than or equal to the impact factor threshold, determines that the power grid equivalent model is a simplified model according to the new energy power grid parameters and the impact factor; or, based on the impact factor being greater than the impact factor threshold, determines that the power grid equivalent model is a detailed model according to the acquired new energy control strategy type, so that the impact of the new energy power grid parameters on the studied area can be quantified as an impact factor, and the impact factor is compared with the impact factor threshold to determine whether the power grid equivalent model is a simplified model or a detailed model, and establishes a simplified model or a detailed model according to different situations, so as to realize accurate equivalent modeling of new energy sites.

[0028] The following combination Figure 1 , the new energy grid modeling method is further explained.

[0029] In one possible implementation, the new energy grid parameters include active output parameters, access distance parameters and grid short-circuit capacity parameters; step 102 may specifically include generating an impact factor based on the access distance parameter being equal to the distance threshold, according to the active output parameter and the grid short-circuit capacity parameter; or, based on the access distance parameter not being equal to the distance threshold, generating an impact factor based on the active output parameter, the access distance parameter and the grid short-circuit capacity parameter.

[0030] In some embodiments, the active output parameter P includes the active output of the new energy, the access distance parameter L includes the distance between the new energy collection access location and the study area, and the grid short-circuit capacity parameter S includes the grid short-circuit capacity of the new energy grid connection point.

[0031] The calculation device generates the influence factor k based on the active output parameter, the access distance parameter and the grid short-circuit capacity parameter through the influence factor formula. The calculation device compares the access distance parameter L with the distance threshold Lset. When L is equal to the distance threshold Lset, the influence factor k is determined according to the ratio of the active output parameter P to the grid short-circuit capacity parameter S; when the access distance parameter L is not equal to the distance threshold Lset, the difference between the distance threshold Lset and the access distance parameter L is taken as the distance difference, the ratio of the active output parameter P to the grid short-circuit capacity parameter S is taken as the active short-circuit ratio, and the influence factor k is determined according to the product of the distance difference and the active short-circuit ratio.

[0032] For example, the impact factor formula is k= . Where S is a value greater than 0.

[0033] In a possible implementation, the new energy control strategy type includes a grid-following type or a grid-building type, and the detailed model includes a site model or a virtual impedance voltage source model; accordingly, based on the impact factor being greater than the impact factor threshold, the grid equivalent model is determined to be a detailed model according to the acquired new energy control strategy type, including: based on the impact factor being greater than the impact factor threshold, according to the new energy control strategy type being a grid-following type, the grid equivalent model is determined to be a site model; or, based on the impact factor being greater than the impact factor threshold, according to the new energy control strategy type being a grid-building type, the grid equivalent model is determined to be a virtual impedance voltage source model.

[0034] In some embodiments, the impact factor k can be compared with the impact factor threshold. When the impact factor k is greater than the impact factor threshold, it means that the access distance parameter L is less than or equal to the distance threshold Lset, and the active output parameter P is not equal to 0, and the new energy output has a greater impact on the studied area. For example, the impact factor threshold is 0.

[0035] The new energy grid parameters also include reactive output parameters Q, which include reactive output of new energy. The computing device determines that the grid equivalent model is an electromagnetic transient model when the impact factor is greater than the impact factor threshold, the new energy control strategy type is a grid-following type, and the reactive output parameter Q is not 0; the station model is generated based on the electromagnetic transient model. At this time, the new energy stand-alone model needs to carry out detailed electromagnetic transient modeling, establish an electromagnetic transient model, and then use the power multiplication module to model the new energy station according to the electromagnetic transient model.

[0036] Alternatively, the computing device determines that the grid equivalent model is a virtual impedance voltage source model based on the fact that the impact factor is greater than the impact factor threshold, the new energy control strategy type is a grid-building type, and the reactive output parameter Q is not 0. The virtual impedance voltage source model is a model established based on virtual impedance and voltage source.

[0037] Therefore, when the impact factor is greater than the impact factor threshold, different types of new energy control strategies can be mapped to different detailed models based on the different types of new energy control strategies, so as to establish a detailed model that best matches the power grid equivalent model.

[0038] In a possible implementation, the new energy grid parameters include reactive output parameters, and the simplified model includes a capacitor model, an inductor model or a Thevenin model; accordingly, based on the impact factor being less than or equal to the impact factor threshold, the grid equivalent model is determined to be a simplified model according to the new energy grid parameters and the impact factor, including: based on the impact factor being equal to the first threshold, based on the reactive output parameter being greater than the reactive output threshold, determining that the grid equivalent model is a capacitor model, wherein the first threshold is less than or equal to the impact factor threshold; or, based on the impact factor being equal to the first threshold, based on the reactive output parameter being less than or equal to the reactive output threshold, determining that the grid equivalent model is an inductor model; or, based on the impact factor being less than or equal to the impact factor threshold and not equal to the first threshold, determining that the grid equivalent model is a Thevenin model.

[0039] In some embodiments, the computing device determines that the impact factor k is less than or equal to the impact factor threshold. For example, the impact factor threshold is 0. When the impact factor k is equal to the impact factor threshold, it means that the active output parameter P is equal to 0, and the new energy output has little impact on the studied area. When the impact factor k is less than the impact factor threshold, it means that the access distance parameter L is greater than or equal to the distance threshold Lset, and the active output parameter P is not equal to 0, and the new energy output has little impact on the studied area.

[0040] The first threshold is less than or equal to the impact factor threshold setting value. For example, when the impact factor threshold is 0, the value range of the first threshold is a range less than or equal to 0, and the first threshold can be 0. When the impact factor is equal to the first threshold, the computing device can compare the reactive output parameter with the reactive output threshold. When the reactive output parameter is greater than the reactive output threshold, the grid equivalent model is determined to be a capacitance model. The capacitance model includes a capacitance load parameter; after determining that the grid equivalent model is a capacitance model, it also includes: determining the capacitance load parameter based on the reactive output parameter; generating the capacitance model based on the capacitance load parameter. When the reactive output parameter is less than or equal to the reactive output threshold, the grid equivalent model is determined to be an inductance model. The inductance model includes an inductance load parameter; after determining that the grid equivalent model is an inductance model, it also includes: determining the inductance load parameter based on the reactive output parameter; generating the inductance model based on the inductance load parameter.

[0041] For example, when the first threshold is 0 and the reactive output threshold is 0, the impact factor is equal to 0. When the computing device compares that the reactive output parameter is greater than 0, it determines that the grid equivalent model is a capacitor model. When creating a capacitor model, a capacitor load parameter is required. The capacitor load parameter includes a capacitor load , so that the capacitive load Equal to the reactive output parameter Q, expressed as =Q, thus obtaining the capacitive load The computing device creates a capacitance model based on the value of . When the computing device compares the reactive output parameter and finds that it is less than or equal to 0, it determines that the grid equivalent model is an inductance model. When creating an inductance model, the inductance load parameter is required. The inductance load parameter includes the inductance load , so that the inductive load Equal to the negative number of the reactive output parameter, expressed as =-Q, thus obtaining the inductive load The computing device creates an inductance model based on the value of .

[0042] When the first threshold is 0 and the reactive output threshold is 0, if the computing device determines that the impact factor is less than 0, it determines that the grid equivalent model is the Thevenin model. At this time, the new energy modeling can use the traditional Thevenin equivalent method to create the Thevenin model.

[0043] In a possible implementation, after step 103, the following further includes: step 104: the computing device creates a simplified model or a detailed model.

[0044] In some embodiments, Figure 2 is a classification modeling diagram provided by an embodiment of this specification, such as Figure 2 As shown, the computing device obtains parameters related to new energy and power grid, which include actual active and reactive output of new energy, type of new energy control strategy (grid-following type, grid-building type), distance between the new energy collection access location and the studied area, and other parameters; based on the actual active and reactive output of new energy, type of new energy control strategy (grid-following type, grid-building type), distance between the new energy collection access location and the studied area, and other parameters, the impact factor k of new energy on the studied area is determined, thereby determining the modeling method of new energy; specifically: determine whether K is 0; when k is not equal to 0, determine whether K is greater than 0; when k is less than 0, new energy modeling can use traditional Thevenin equivalent method equates new energy to the Thevenin model of voltage source and impedance; when K is greater than 0, determine whether the new energy control strategy is a grid-building type; when the new energy control strategy is a grid-following type, the new energy stand-alone model needs to perform detailed electromagnetic transient modeling, and then use the power multiplication module to model the new energy station; when the new energy control strategy is a grid-building type, the new energy station can be equivalent to a model of virtual impedance and voltage source; when k is equal to 0, determine whether the new energy reactive output Q is greater than 0; when the new energy reactive output Q is greater than 0, the new energy equivalent modeling is a capacitive load; when the new energy reactive output Q is less than or equal to 0, the new energy equivalent modeling is an inductive load.

[0045] Simplified models include capacitor models, inductor models or Thevenin models, and detailed models include field station models or virtual impedance voltage source models, such as Figure 2 As shown, depending on different situations, the computing device can create different models.

[0046] Figure 3 This is a connection diagram provided by an embodiment of this specification, such as Figure 3 As shown in FIG. 1 , the equivalent models under different scenarios of new energy are connected to other equivalent systems in the study area through a tie line L, where other equivalent systems in the study area are already well-established systems, for example, other equivalent systems in the study area are internal systems of ultra-high / ultra-high voltage transmission and transformation engineering systems. The equivalent models under different scenarios of new energy can be determined according to the value of the influencing factor k or according to the value of the influencing factor k and the reactive output parameter Q to determine the model connected to other equivalent systems in the study area.

[0047] like Figure 3 As shown in the figure, when k>0, depending on whether the new energy control strategy type is grid-following type or grid-building type, the station model or virtual impedance voltage source model is connected to other equivalent systems in the study area through the tie line L. Both the station model and the virtual impedance voltage source model are represented by a wind farm, a transformer and a busbar; the wind farm is connected to one end of the transformer, and the other end of the transformer is connected to one end of the busbar; at this time, the tie line L includes a resistor With two capacitors to ground ,resistance Connect the capacitors to ground at both ends ,resistance One end of the resistor is also connected to the other end of the busbar. The other end is also connected to an equal voltage source One end of the resistor with equal impedance One end and the mutual impedance resistor One end of the connection; equal value voltage source , Equivalent impedance resistor and mutual impedance resistance Other equivalent systems and equivalent voltage sources located in the study area The other end of the resistor is connected to the The other end of the voltage source is grounded. One end of the resistor with equal impedance One end and the mutual impedance resistor There is a connection relationship at one end.

[0048] like Figure 3As shown in the figure, when k < 0, the equivalent model of the power grid is determined to be the Thevenin model, and the Thevenin model is connected to other equivalent systems in the study area through the tie line L. The Thevenin model is represented by an equivalent voltage source U, an equivalent impedance R and a bus; the equivalent voltage source U is connected to one end of the equivalent impedance R, and the other end of the equivalent impedance R is connected to one end of the bus; at this time, the tie line L includes a resistor With two capacitors to ground ,resistance Connect the capacitors to ground at both ends ,resistance One end of the resistor is also connected to the other end of the busbar. The other end is also connected to an equal voltage source One end of the resistor with equal impedance One end of the mutual impedance resistor One end and the mutual impedance resistor The value of α is an integer greater than or equal to 3 and less than or equal to n, n is an integer, and the value of n is equal to the number of equivalent voltage sources in other equivalent systems in the study area; equivalent voltage source The other end of the resistor is connected to the The other end of the voltage source is grounded. One end of the resistor with equal impedance One end of the mutual impedance resistor One end and the mutual impedance resistor There is a connection relationship at one end.

[0049] like Figure 3 As shown in Figure 1, when k=0 and Q<0, the equivalent model of the power grid is determined to be an inductance model, and the inductance model is connected to other equivalent systems in the study area through the tie line L. The inductance model is represented by an inductance load module, and the inductance of the inductance load module is the inductance load. ; When k=0 and Q>0, the equivalent model of the power grid is determined to be a capacitor model, and the capacitor model is connected to other equivalent systems in the study area through the tie line L. The capacitor model is represented by a capacitor load module, and the capacitance of the capacitor load module is the capacitor load The tie line L corresponding to the inductance model and the capacitance model can be the same. In this case, the tie line L includes a resistor With two capacitors to ground ,resistance Connect the capacitors to ground at both ends The capacitive load module is connected through a resistor With mutual impedance resistance , equivalent voltage source One end and equal impedance resistor one end of , where the value of β is an integer greater than or equal to 1 and less than or equal to n-1, and β is not equal to 2.

[0050] In a possible implementation, after step 103, the method further includes: step 105: the computing device generates a power grid operation prediction value based on a power grid equivalent model, where the power grid equivalent model includes a simplified model or a detailed model.

[0051] In some embodiments, when the computing device determines that the power grid equivalent model is a simplified model based on the new energy power grid parameters and the impact factor, based on the impact factor being less than or equal to the impact factor threshold, in step 105, the power grid equivalent model includes the simplified model, and the computing device generates a power grid operation prediction value based on the simplified model when executing step 105.

[0052] When the computing device determines that the power grid equivalent model is a detailed model based on the influence factor being greater than the influence factor threshold and according to the acquired new energy control strategy type, in step 105, the power grid equivalent model includes the detailed model, and the computing device generates a power grid operation prediction value based on the detailed model when executing step 105.

[0053] The grid operation prediction value includes at least one of an active power prediction value, a reactive power prediction value, a voltage prediction value, a power angle prediction value and a grid electromechanical transient data prediction value.

[0054] Step 106: The computing device obtains actual values ​​of power grid operation.

[0055] In some embodiments, the actual value of the power grid operation includes at least one of an actual value of active power, an actual value of reactive power, an actual value of voltage, an actual value of power angle, and an actual value of electromechanical transient data of the power grid.

[0056] Step 107: The computing device runs the power grid equivalent model based on the matching of the power grid operation prediction value and the power grid operation actual value; or, based on the mismatch between the power grid operation prediction value and the power grid operation actual value, executes step 101.

[0057] In some embodiments, the computing device generates an error value based on the predicted value of the grid operation and the actual value of the grid operation; determines that the predicted value of the grid operation matches the actual value of the grid operation based on the error value being less than or equal to the error threshold; or, the computing device determines that the predicted value of the grid operation does not match the actual value of the grid operation based on the error value being greater than the error threshold. The error value includes the error difference between the predicted value of the grid operation and the actual value of the grid operation, or the error value includes the error ratio between the error difference and the actual value of the grid operation. The error threshold can be adjusted according to the calculation method of the error value, for example, the error value includes the error ratio, and the error threshold is 1%.

[0058] The computing device calculates the grid operation prediction value and the grid operation actual value corresponding to the grid operation prediction value to obtain an error value. The error value includes at least one of an active power error value, a reactive power error value, a voltage error value, a power angle error value, and a grid electromechanical transient data error value.

[0059] For example, when the grid operation prediction value includes the active power prediction value, the reactive power prediction value, the voltage prediction value, the power angle prediction value and the grid electromechanical transient data prediction value, and the grid operation actual value includes the active power actual value, the reactive power actual value, the voltage actual value, the power angle actual value and the grid electromechanical transient data actual value, the computing device generates an active power error value based on the active power prediction value and the active power actual value; similarly, the reactive power error value, the voltage error value, the power angle error value and the grid electromechanical transient data error value can be obtained; at this time, the error threshold includes the active power error threshold, the reactive power error threshold, the voltage error threshold, the power angle error threshold The value is compared with the error threshold of the electromechanical transient data of the power grid, and the active power error value is compared with the active power error threshold, the reactive power error value is compared with the reactive power error threshold, the voltage error value is compared with the voltage error threshold, the power angle error value is compared with the power angle error threshold, and the power grid electromechanical transient data error value is compared with the power grid electromechanical transient data error threshold. If the comparison result of any error value with the error threshold is that the error value is greater than the error threshold, it is determined that the power grid operation prediction value does not match the power grid operation actual value; when the comparison result of all error values ​​with the error threshold is that the error value is less than or equal to the error threshold, it is determined that the power grid operation prediction value matches the power grid operation actual value.

[0060] When it is determined that the predicted value of the grid operation matches the actual value of the grid operation, it indicates that the simplified model or detailed model established is a suitable grid equivalent model, and then the grid equivalent model is used to calculate and analyze the internal overvoltage under the operating characteristics of new energy.

[0061] The present specification provides a new energy power grid modeling method, which obtains new energy power grid parameters; generates an impact factor based on the new energy power grid parameters; based on the impact factor being less than or equal to the impact factor threshold, determines that the power grid equivalent model is a simplified model according to the new energy power grid parameters and the impact factor; or, based on the impact factor being greater than the impact factor threshold, determines that the power grid equivalent model is a detailed model according to the acquired new energy control strategy type. Thus, the present specification provides a modeling method suitable for new energy power grid access scenarios, which can quantify the impact of new energy power grid parameters on the studied area as an impact factor in the scenario of large-scale new energy centralized power grid access, compare the impact factor with the impact factor threshold to determine whether the power grid equivalent model is a simplified model or a detailed model, establish a simplified model or a detailed model according to different situations, and realize accurate equivalent modeling of new energy sites.

[0062] Corresponding to the above method embodiment, this specification also provides a new energy grid modeling device embodiment, Figure 4 is a schematic diagram of a new energy grid modeling device provided by an embodiment of this specification, such as Figure 4 As shown, the device includes: a first acquisition module 401, a first generation module 402 and a first determination module 403. The first acquisition module 401 is connected to the first generation module 402, and the first generation module 402 is connected to the first determination module 403.

[0063] The first acquisition module 401 is configured to acquire new energy grid parameters; the first generation module 402 is configured to generate an influence factor based on the new energy grid parameters; the first determination module 403 is configured to determine that the grid equivalent model is a simplified model based on the new energy grid parameters and the influence factor based on the influence factor being less than or equal to the influence factor threshold; or, based on the influence factor being greater than the influence factor threshold, determine that the grid equivalent model is a detailed model based on the acquired new energy control strategy type.

[0064] In one possible implementation, the new energy control strategy type includes a grid-following type or a grid-building type, and the detailed model includes a site model or a virtual impedance voltage source model; the first determination module 403 is configured to determine that the grid equivalent model is a site model based on the impact factor being greater than the impact factor threshold and according to the new energy control strategy type being a grid-following type; or, based on the impact factor being greater than the impact factor threshold and according to the new energy control strategy type being a grid-building type, determine that the grid equivalent model is a virtual impedance voltage source model.

[0065] In one possible implementation, the new energy grid parameters include reactive output parameters, and the simplified model includes a capacitor model, an inductor model or a Thevenin model; the first determination module 403 is configured to determine that the grid equivalent model is a capacitor model based on an influence factor being equal to a first threshold and according to the reactive output parameter being greater than the reactive output threshold, wherein the first threshold is less than or equal to the influence factor threshold; or, based on the influence factor being equal to the first threshold and according to the reactive output parameter being less than or equal to the reactive output threshold, determine that the grid equivalent model is an inductor model; or, based on the influence factor being less than or equal to the influence factor threshold and not equal to the first threshold, determine that the grid equivalent model is a Thevenin model.

[0066] In a possible implementation, the device further includes: a second determination module 404 and a second generation module 405. The second determination module 404 is connected to the first determination module 403 and the second generation module 405.

[0067] The capacitor model includes a capacitor load parameter; a second determination module 404 is configured to determine the capacitor load parameter based on the reactive power output parameter; and a second generation module 405 is configured to generate the capacitor model based on the capacitor load parameter.

[0068] In a possible implementation, the inductance model includes an inductance load parameter; the second determination module 404 is configured to determine the inductance load parameter based on the reactive power output parameter; and the second generation module 405 is configured to generate the inductance model based on the inductance load parameter.

[0069] In one possible implementation, the new energy grid parameters include active output parameters, access distance parameters and grid short-circuit capacity parameters; the first generation module 402 is configured to generate an impact factor based on the access distance parameter being equal to the distance threshold, according to the active output parameter and the grid short-circuit capacity parameter; or, based on the access distance parameter not being equal to the distance threshold, generate an impact factor based on the active output parameter, the access distance parameter and the grid short-circuit capacity parameter.

[0070] In a possible implementation, the device further includes: a third generating module 406 , a second acquiring module 407 , and an operating module 408 . The third generating module 406 is connected to the first determining module 403 and the second acquiring module 407 , and the second acquiring module 407 is connected to the operating module 408 .

[0071] The third generation module 406 is configured to generate a power grid operation prediction value based on a power grid equivalent model, and the power grid equivalent model includes a simplified model or a detailed model; the second acquisition module 407 is configured to obtain the actual power grid operation value; the operation module 408 is configured to operate the power grid equivalent model based on the matching of the power grid operation prediction value with the actual power grid operation value; or, based on the mismatch between the power grid operation prediction value and the actual power grid operation value, trigger the first acquisition module 401 to execute the operation of acquiring new energy power grid parameters.

[0072] The present specification provides a new energy power grid modeling method, wherein the first acquisition module is configured to acquire new energy power grid parameters; the first generation module is configured to generate an influencing factor based on the new energy power grid parameters; the first determination module is configured to determine that the power grid equivalent model is a simplified model based on the new energy power grid parameters and the influencing factor, based on the influencing factor being less than or equal to the influencing factor threshold; or, based on the influencing factor being greater than the influencing factor threshold, the power grid equivalent model is determined to be a detailed model according to the acquired new energy control strategy type, so that the impact of the new energy power grid parameters on the studied area can be quantified as an influencing factor, and the influencing factor is compared with the influencing factor threshold to determine whether the power grid equivalent model is a simplified model or a detailed model, and a simplified model or a detailed model is established according to different situations to achieve accurate equivalent modeling of new energy sites.

[0073] The above is a schematic scheme of a new energy grid modeling device of this embodiment. It should be noted that the technical scheme of the new energy grid modeling device and the technical scheme of the new energy grid modeling method mentioned above belong to the same concept, and the details not described in detail in the technical scheme of the new energy grid modeling device can be found in the description of the technical scheme of the new energy grid modeling method mentioned above.

[0074] Figure 5 5 is a block diagram of a computing device 500 provided in one embodiment of the present specification. The components of the computing device 500 include but are not limited to a memory 510 and a processor 520. The processor 520 is connected to the memory 510 via a bus 530, and the database 550 is used to store data.

[0075] The computing device 500 also includes an access device 540 that enables the computing device 500 to communicate via one or more networks 560. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 540 may include one or more of any type of network interface (e.g., a network interface card (NIC)) that is wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a world-wide interoperability for microwave access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, and a near field communication (NFC).

[0076] In one embodiment of the present specification, the above components of the computing device 500 and Figure 5 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 5 The computing device structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.

[0077] The computing device 500 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook, etc.), a mobile phone (e.g., a smart phone), a wearable computing device (e.g., a smart watch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or a personal computer (PC). The computing device 500 may also be a mobile or stationary server.

[0078] Among them, the processor 520 is used to execute the following computer executable instructions, which implement the steps of the above-mentioned new energy grid modeling method when executed by the processor. The above is a schematic scheme of a computing device of this embodiment. It should be noted that the technical scheme of the computing device and the technical scheme of the above-mentioned new energy grid modeling method belong to the same concept. The details of the technical scheme of the computing device that are not described in detail can be found in the description of the technical scheme of the above-mentioned new energy grid modeling method.

[0079] An embodiment of the present specification also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the above-mentioned new energy grid modeling method.

[0080] The above is a schematic scheme of a computer-readable storage medium of this embodiment. It should be noted that the technical scheme of the storage medium and the technical scheme of the above-mentioned new energy grid modeling method belong to the same concept, and the details not described in detail in the technical scheme of the storage medium can be referred to the description of the technical scheme of the above-mentioned new energy grid modeling method.

[0081] An embodiment of the present specification also provides a computer program, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned new energy power grid modeling method.

[0082] The above is a schematic scheme of a computer program of this embodiment. It should be noted that the technical scheme of the computer program and the technical scheme of the above-mentioned new energy grid modeling method belong to the same concept, and the details not described in detail in the technical scheme of the computer program can be referred to the description of the technical scheme of the above-mentioned new energy grid modeling method.

[0083] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0084] The computer instructions include computer program codes, which may be in source code form, object code form, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0085] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0086] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0087] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A new energy grid modeling method, characterized in that: include: Obtain new energy grid parameters; generating an impact factor based on the new energy grid parameters; Based on the fact that the impact factor is less than or equal to the impact factor threshold, the grid equivalent model is determined to be a simplified model according to the new energy grid parameter and the impact factor; or, based on the fact that the impact factor is greater than the impact factor threshold, the grid equivalent model is determined to be a detailed model according to the acquired new energy control strategy type.

2. The method according to claim 1, characterized in that The new energy control strategy type includes a grid-following type or a grid-building type, and the detailed model includes a site model or a virtual impedance voltage source model; Correspondingly, based on the fact that the impact factor is greater than the impact factor threshold, determining the power grid equivalent model as a detailed model according to the acquired new energy control strategy type includes: Based on the fact that the impact factor is greater than the impact factor threshold, and according to the fact that the new energy control strategy type is the grid-following type, determining that the grid equivalent model is the station model; or, Based on the fact that the impact factor is greater than the impact factor threshold, and according to the fact that the new energy control strategy type is the grid type, it is determined that the grid equivalent model is the virtual impedance voltage source model.

3. The method according to claim 1, characterized in that The new energy grid parameters include reactive power output parameters, and the simplified model includes a capacitor model, an inductor model or a Thevenin model; Correspondingly, based on the fact that the impact factor is less than or equal to the impact factor threshold, determining the grid equivalent model as a simplified model according to the new energy grid parameter and the impact factor includes: Based on the fact that the impact factor is equal to a first threshold value, and according to the fact that the reactive output parameter is greater than the reactive output threshold value, determining that the power grid equivalent model is the capacitor model, wherein the first threshold value is less than or equal to the impact factor threshold value; or Based on the fact that the impact factor is equal to the first threshold and the reactive output parameter is less than or equal to the reactive output threshold, determining that the grid equivalent model is the inductance model; or, Based on the fact that the impact factor is less than or equal to the impact factor threshold and is not equal to the first threshold, it is determined that the power grid equivalent model is the Thevenin model.

4. The method according to claim 3, characterized in that The capacitance model includes capacitance load parameters; Correspondingly, after determining that the power grid equivalent model is the capacitance model, the method further includes: Based on the reactive power output parameter, determining the capacitive load parameter; The capacitance model is generated based on the capacitance load parameter.

5. The method according to claim 3, characterized in that: The inductance model includes inductance load parameters; Correspondingly, after determining that the power grid equivalent model is the inductance model, the method further includes: Based on the reactive power output parameter, determining the inductive load parameter; The inductance model is generated based on the inductive load parameters.

6. The method according to claim 1, characterized in that The new energy grid parameters include active output parameters, access distance parameters and grid short-circuit capacity parameters; Accordingly, the generating of the influencing factor based on the new energy grid parameter includes: Based on the access distance parameter being equal to the distance threshold, generating the impact factor according to the active output parameter and the grid short-circuit capacity parameter; or, Based on the fact that the access distance parameter is not equal to the distance threshold, the impact factor is generated according to the active output parameter, the access distance parameter and the grid short-circuit capacity parameter.

7. The method according to claim 1, characterized in that After determining that the grid equivalent model is a simplified model according to the new energy grid parameter and the influencing factor or determining that the grid equivalent model is a detailed model according to the acquired new energy control strategy type, the method further includes: Generating a power grid operation prediction value based on the power grid equivalent model, wherein the power grid equivalent model includes the simplified model or the detailed model; Obtain actual values ​​of power grid operation; Based on the matching of the predicted operation value of the power grid and the actual operation value of the power grid, the power grid equivalent model is run; or, based on the mismatch between the predicted operation value of the power grid and the actual operation value of the power grid, the step of obtaining the new energy power grid parameters is executed.

8. A new energy grid modeling device, characterized in that: include: A first acquisition module is configured to acquire new energy grid parameters; A first generating module is configured to generate an impact factor based on the new energy grid parameter; The first determination module is configured to determine that the power grid equivalent model is a simplified model based on the new energy power grid parameters and the influence factor based on the influence factor being less than or equal to the influence factor threshold; or, based on the influence factor being greater than the influence factor threshold, determine that the power grid equivalent model is a detailed model based on the acquired new energy control strategy type.

9. A computing device, characterized in that include: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the new energy grid modeling method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the new energy grid modeling method described in any one of claims 1 to 7.

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