Simulation analysis method and device for operation characteristics of power distribution network, computer equipment and readable storage medium

Abstract

The invention relates to a simulation analysis method and device for operation characteristics of a power distribution network, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: identifying a control mode of each distributed resource in the novel power distribution network to obtain an identification result of each distributed resource, and respectively sending the identification results to an electromechanical transient simulation platform and an electromagnetic transient simulation platform; according to the identification result, an alternating current system electromechanical transient system equivalent model and an electromechanical transient interface equivalent model are built on the electromechanical transient simulation platform, and a distributed resource equivalent model and an electromagnetic transient interface equivalent model are built on the electromagnetic transient simulation platform; and establishing an electromechanical transient and electromagnetic transient data interaction system to complete multi-rate hybrid simulation for the novel power distribution network. By adopting the method, the simulation precision and the simulation credibility of the simulation result can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric power, and in particular, to a method, device, computer device, computer-readable storage medium, and computer program product for simulating and analyzing the operation characteristics of a distribution network. Background Art

[0002] With the development of electric power technology, the development of distributed new energy clusters has become the strongest driving force. As the last link in the power grid from power production to users, the distribution network is the key to carrying various distributed new energy clusters. However, since various new types of distributed resource clusters usually access the distribution system through power electronic devices, with the continuous increase in the penetration rate of distributed resource clusters in the distribution network, the characteristic analysis of the new distribution network will become more complex. Under this background, the analysis method based on simulation has become the most basic and efficient method for determining the operation characteristics of the new distribution network.

[0003] However, with the development of distributed resource cluster technology, network-forming distributed resources and network-following and network-forming hybrid distributed resources have gradually become the new trend of the development of distributed resource clusters. The simulation technology methods in the related technologies are prone to obvious waveform oscillations in the hybrid simulation of the new distribution network under the access of network-forming distributed resources and network-following and network-forming hybrid distributed resources, affecting the simulation accuracy and credibility of the simulation results.

[0004] Therefore, there is a problem in the related technologies that the simulation results of the operation characteristics of the distribution network are not accurate enough. Summary of the Invention

[0005] Based on this, it is necessary to provide a method, device, computer device, computer-readable storage medium, and computer program product for simulating and analyzing the operation characteristics of a distribution network, which can improve the accuracy of the simulation results of the operation characteristics of the distribution network, aiming at the above technical problems.

[0006] In a first aspect, the present application provides a method for simulating and analyzing the operation characteristics of a distribution network, including:

[0007] Identifying the control modes of various distributed resources in the new distribution network to obtain the identification results of the distributed resources, and respectively sending the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform; wherein, the distributed resources include at least one of network-following distributed resources and network-forming distributed resources;

[0008] According to the identification results, building an equivalent model of the AC system electromechanical transient system and an equivalent model of the electromechanical transient interface on the electromechanical transient simulation platform;

[0009] According to the identification results, building an equivalent model of the distributed resources and an equivalent model of the electromagnetic transient interface on the electromagnetic transient simulation platform;

[0010] Based on the equivalent model of the AC system's electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of the distributed resources, and the equivalent model of the electromagnetic transient interface, establish a data interaction system between the electromechanical transient and the electromagnetic transient to complete the multi-rate hybrid simulation for the new type of distribution network.

[0011] In one embodiment, the establishment of the equivalent model of the AC system's electromechanical transient system on the electromechanical transient simulation platform according to the identification result includes:

[0012] Control the power output of all the grid-connected distributed resources to 0 to generate a grid-forming electromechanical model;

[0013] Control the power output of all the grid-forming distributed resources to 0 to generate a grid-connected electromechanical model;

[0014] Based on the grid-forming electromechanical model and the grid-connected electromechanical model, establish the equivalent model of the AC system's electromechanical transient system on the electromechanical transient simulation platform.

[0015] In one embodiment, the equivalent model of the electromechanical transient interface includes an equivalent current source of the electromechanical transient interface 、an equivalent voltage source of the electromechanical transient interface 、a first equivalent impedance of the electromechanical transient interface and a second equivalent impedance of the electromechanical transient interface ;

[0016] The establishment of the equivalent model of the AC system's electromechanical transient system and the equivalent model of the electromechanical transient interface on the electromechanical transient simulation platform according to the identification result includes:

[0017] The positive pole of the equivalent current source of the electromechanical transient interface and one port of the first equivalent impedance of the electromechanical transient interface are connected to one port of the second equivalent impedance of the electromechanical transient interface to form the positive pole of the equivalent model of the electromechanical transient interface; the other port of the second equivalent impedance of the electromechanical transient interface is connected to the positive pole of the equivalent voltage source of the electromechanical transient interface ;

[0018] The negative pole of the equivalent current source of the electromechanical transient interface and the other port of the first equivalent impedance of the electromechanical transient interface are connected to the negative pole of the equivalent voltage source of the electromechanical transient interface to form the negative pole of the equivalent model of the electromechanical transient interface.

[0019] In one embodiment, establishing a data interaction system between the electromechanical transient and the electromagnetic transient to complete the multi-rate hybrid simulation for the new distribution network includes:

[0020] In each simulation duration, for the distributed resource equivalent model, by using the electromagnetic transient program algorithm based on the adjoint matrix, determining the quantitative values of the key parameters of the electromechanical transient interface equivalent model; the key parameters of the electromechanical transient interface equivalent model include the electromechanical transient interface equivalent current source , the electromechanical transient interface equivalent voltage source , the first electromechanical transient interface equivalent impedance and the second electromechanical transient interface equivalent impedance of at least one parameter.

[0021] In one embodiment, the electromagnetic transient interface equivalent model includes an electromagnetic transient interface equivalent current source , a first electromagnetic transient interface equivalent impedance , an electromagnetic transient interface equivalent voltage source and a second electromagnetic transient interface equivalent impedance ;

[0022] According to the identification result, building the distributed resource equivalent model and the electromagnetic transient interface equivalent model on the electromagnetic transient simulation platform includes:

[0023] The positive pole of the electromagnetic transient interface equivalent current source , one port of the first electromagnetic transient interface equivalent impedance , is connected to one port of the second electromagnetic transient interface equivalent impedance to form the positive pole of the electromagnetic transient interface equivalent model; the other port of the second electromagnetic transient interface equivalent impedance is connected to the positive pole of the electromagnetic transient interface equivalent voltage source ;

[0024] The negative pole of the electromagnetic transient interface equivalent current source , the other port of the first electromagnetic transient interface equivalent impedance , is connected to the negative pole of the electromagnetic transient interface equivalent voltage source to form the negative pole of the electromagnetic transient interface equivalent model.

[0025] In one embodiment, establishing a data interaction system between the electromechanical transient and the electromagnetic transient to complete the multi-rate hybrid simulation for the new distribution network includes:

[0026] During each simulation duration, for the equivalent model of the AC system's electromechanical transient system, the quantitative values of the key parameters of the electromagnetic transient interface equivalent model are determined through a phasor-based quasi-steady-state model; the key parameters of the electromagnetic transient interface equivalent model include the electromagnetic transient interface equivalent current source , the first electromagnetic transient interface equivalent impedance , the electromagnetic transient interface equivalent voltage source , and at least one of the parameters of the second electromagnetic transient interface equivalent impedance .

[0027] In a second aspect, the present application also provides a simulation analysis device for the operating characteristics of a distribution network, including:

[0028] An identification module, configured to identify the control modes of various distributed resources in a new-type distribution network, obtain the identification results of each of the distributed resources, and send the identification results to an electromechanical transient simulation platform and an electromagnetic transient simulation platform respectively;

[0029] A first construction module, configured to construct an equivalent model of the AC system's electromechanical transient system and an equivalent model of the electromechanical transient interface on the electromechanical transient simulation platform according to the identification results;

[0030] A second construction module, configured to construct an equivalent model of the distributed resources and an equivalent model of the electromagnetic transient interface on the electromagnetic transient simulation platform according to the identification results;

[0031] A third construction module, configured to establish a data interaction system between the electromechanical transient and the electromagnetic transient according to the equivalent model of the AC system's electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of the distributed resources, and the equivalent model of the electromagnetic transient interface, so as to complete the multi-rate hybrid simulation for the new-type distribution network.

[0032] In a third aspect, the present application also provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0033] In a fourth aspect, the present application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0034] In a fifth aspect, the present application also provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by the processor, the steps of the above method are implemented.

[0035] The simulation analysis method, device, computer equipment, computer-readable storage medium and computer program product for the above-mentioned operating characteristics of the distribution network identify the control modes of various distributed resources in the new-type distribution network to obtain the identification results of the distributed resources, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively; wherein, the distributed resources include at least one of the grid-following distributed resources and the grid-forming distributed resources; according to the identification results, an equivalent model of the AC system electromechanical transient system and an equivalent model of the electromechanical transient interface are built on the electromechanical transient simulation platform; according to the identification results, an equivalent model of the distributed resources and an equivalent model of the electromagnetic transient interface are built on the electromagnetic transient simulation platform; according to the equivalent model of the AC system electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of the distributed resources and the equivalent model of the electromagnetic transient interface, a data interaction system between the electromechanical transient and the electromagnetic transient is established to complete the multi-rate hybrid simulation for the new-type distribution network.

[0036] Thus, compared with the conventional multi-rate simulation method based on the ideal transformer model interface, the present application can identify the control modes of various distributed resources including grid-following and grid-forming in the new-type distribution network, and use the identification results to build different equivalent models. This enables more accurate simulation of the complex and diverse operating conditions in the new-type distribution network, because the control modes of the distributed resources have an important impact on the operating characteristics of the distribution network. By accurately identifying and modeling, the accuracy and reliability of the simulation results are improved, and the operating characteristics of the actual distribution network can be better reflected. Moreover, by building the equivalent model of the electromagnetic transient interface and the equivalent model of the electromechanical transient interface, and establishing a data interaction system between the electromechanical transient and the electromagnetic transient, multi-rate hybrid simulation between the electromechanical transient and the electromagnetic transient is realized. This multi-rate hybrid simulation method can simulate and analyze the distribution network on different time scales, and can more comprehensively study the operating characteristics of the distribution network under different transient processes. The establishment of the data interaction system promotes the collaborative analysis of the two different levels of the electromechanical transient and the electromagnetic transient. It enables full consideration of the mutual influence between the two levels during the simulation process, avoids the problem of inaccurate grasp of the overall characteristics of the system that may occur when performing electromechanical transient or electromagnetic transient simulation alone, helps to more deeply analyze the coupling relationship between the electromechanical process and the electromagnetic process in the distribution network, and improves the simulation accuracy and simulation credibility of the simulation results. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained according to these drawings.

[0038] Figure 1 Schematic flowchart of a simulation analysis method for operating characteristics of a distribution network in one embodiment;

[0039] Figure 2 Architecture diagram of a general model for electromechanical - electromagnetic hybrid multi - rate simulation of a new - type distribution network in one embodiment;

[0040] Figure 3 Schematic flowchart of a simulation analysis method for operating characteristics of a distribution network in another embodiment;

[0041] Figure 4 Structure block diagram of a simulation analysis device for operating characteristics of a distribution network in one embodiment;

[0042] Figure 5 Internal structure diagram of a computer device in one embodiment. Detailed implementation manners

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above - mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0045] In one embodiment, as Figure 1 shown, a simulation analysis method for operating characteristics of a distribution network is provided. In this embodiment, the method is exemplified by being applied to a computer device. It can be understood that the computer device can be a terminal, a server, or a system including a terminal and a server. In this embodiment, the method includes the following steps:

[0046] Step S110, identify the control modes of various distributed resources in the new - type distribution network, obtain the identification results of the various distributed resources, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively.

[0047] Among them, the distributed resources include at least one of network - following distributed resources and network - forming distributed resources.

[0048] In a specific implementation, the computer device can identify the control modes of various distributed resources in the new-type distribution network, obtain the identification results of the various distributed resources, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively.

[0049] Among them, for any distributed resource, when the control system of the any distributed resource contains a phase-locked loop, the computer device can determine that the identification result of the any distributed resource is that the any distributed resource is a grid-following distributed resource; when the control system of the any distributed resource does not contain a phase-locked loop, the computer device can determine that the identification result of the any distributed resource is that the any distributed resource is a grid-forming distributed resource.

[0050] Step S120, according to the identification results, build an equivalent model of the electromechanical transient system of the AC system and an equivalent model of the electromechanical transient interface on the electromechanical transient simulation platform.

[0051] Among them, this application adopts an electromechanical transient decoupling modeling method based on the classification of grid-forming equivalent and grid-following equivalent according to the control mode classification of distributed resources.

[0052] Specifically, in the process of building the equivalent model of the electromechanical transient system of the AC system, the computer device can control the power output of all the grid-following distributed resources to be 0 to generate a grid-forming electromechanical model; control the power output of all the grid-forming distributed resources to be 0 to generate a grid-following electromechanical model; and build an equivalent model of the electromechanical transient system of the AC system on the electromechanical transient simulation platform according to the grid-forming electromechanical model and the grid-following electromechanical model.

[0053] In practical applications, for the convenience of those skilled in the art to understand, Figure 2 a schematic diagram of the architecture of a general model for electromechanical-electromagnetic hybrid multi-rate simulation of a new-type distribution network is provided. As Figure 2 shown, the equivalent model of the electromechanical transient system of the AC system is divided into two parts: a grid-forming electromechanical model and a grid-following electromechanical model. Among them, when the grid-forming electromechanical model is generated, the power output of all the grid-following distributed resources in the system is 0; when the grid-following electromechanical model is generated, the power output of all the grid-forming distributed resources in the system is 0.

[0054] In practical applications, the equivalent model of the electromechanical transient interface is as Figure 2 shown on the left, and mainly consists of an equivalent current source of the electromechanical transient interface , an equivalent voltage source of the electromechanical transient interface , a first equivalent impedance of the electromechanical transient interface and a second equivalent impedance of the electromechanical transient interface which are four parts. The positive pole of the equivalent current source of the electromechanical transient interface , the first equivalent impedance of the electromechanical transient interface One port of is connected to form the positive pole of the equivalent model of the electromechanical transient interface; the equivalent impedance of the second electromechanical transient interface Another port of is connected to the positive pole of the equivalent voltage source of the electromechanical transient interface The negative pole of the equivalent current source of the electromechanical transient interface, the other port of the first equivalent impedance of the electromechanical transient interface Another port of is connected to the negative pole of the equivalent voltage source of the electromechanical transient interface to form the negative pole of the equivalent model of the electromechanical transient interface.

[0055] Step S130, according to the identification result, build the equivalent model of distributed resources and the equivalent model of the electromagnetic transient interface on the electromagnetic transient simulation platform.

[0056] Among them, this application adopts an electromagnetic transient modeling method based on the classification of network formation and network following according to the control mode classification of distributed resources.

[0057] Among them, as Figure 2 shown, the equivalent model of distributed resources mainly includes two parts: the network-forming distributed resource model and the network-following distributed resource model. Among them, the network-forming distributed resource model refers to the distributed resources adopting network-forming control; the network-following distributed resource model refers to the distributed resources adopting network-following control.

[0058] Among them, the equivalent model of the electromagnetic transient interface is as Figure 2 shown on the right, and mainly consists of the equivalent current source of the electromagnetic transient interface , the first equivalent impedance of the electromagnetic transient interface , the equivalent voltage source of the electromagnetic transient interface and the second equivalent impedance of the electromagnetic transient interface These four parts.

[0059] Among them, the positive pole of the equivalent current source of the electromagnetic transient interface , one port of the first equivalent impedance of the electromagnetic transient interface , is connected to one port of the second equivalent impedance of the electromagnetic transient interface to form the positive pole of the equivalent model of the electromagnetic transient interface; the other port of the second equivalent impedance of the electromagnetic transient interface is connected to the positive pole of the equivalent voltage source of the electromagnetic transient interface ; the negative pole of the equivalent current source of the electromagnetic transient interface , the other port of the first equivalent impedance of the electromagnetic transient interface , is connected to the negative pole of the equivalent voltage source of the electromagnetic transient interface to form the negative pole of the equivalent model of the electromagnetic transient interface.

[0060] Step S140: Establish a data interaction system between the electromechanical transient and electromagnetic transient based on the equivalent model of the AC system's electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of distributed resources, and the equivalent model of the electromagnetic transient interface, so as to complete the multi-rate hybrid simulation for the new distribution network.

[0061] Among them, in the process of establishing a data interaction system between the electromechanical transient and electromagnetic transient to complete the multi-rate hybrid simulation for the new distribution network, within each simulation duration, for the equivalent model of the AC system's electromechanical transient system, the quantitative values of the key parameters of the electromagnetic transient interface equivalent model can be determined through a phasor-based quasi-steady state model; the key parameters of the electromagnetic transient interface equivalent model include the electromagnetic transient interface equivalent current source 、the first electromagnetic transient interface equivalent impedance 、the electromagnetic transient interface equivalent voltage source and the second electromagnetic transient interface equivalent impedance at least one of the parameters.

[0062] In practical applications, both the network-forming electromechanical model and the network-following electromechanical model use a phasor-based quasi-steady state model for calculation, without considering the dynamic processes of ferromagnetic components in systems such as transmission lines and transformers, thus transforming the time-varying nonlinear equations of the AC system into phasor-based linear algebraic equations, accelerating the simulation speed. Within each simulation step, after the calculation of the equivalent model of the AC system's electromechanical transient system is completed, the quantitative values of the key parameters of the electromagnetic transient interface equivalent model need to be given based on the calculation results 、 、 and . Among them, and 's quantitative values are generated by the network-forming electromechanical model; and 's quantitative values are generated by the network-following electromechanical model.

[0063] Among them, the computer device can, within each simulation duration, for the equivalent model of distributed resources, determine the quantitative values of the key parameters of the electromechanical transient interface equivalent model through an algorithm of the electromagnetic transient program (EMTP, Electromagnetic Transients Program) based on the adjoint matrix; the key parameters of the electromechanical transient interface equivalent model include the electromechanical transient interface equivalent current source 、the electromechanical transient interface equivalent voltage source 、the first electromechanical transient interface equivalent impedance and the second electromechanical transient interface equivalent impedance at least one of the parameters.

[0064] In practical applications, whether it is the network-forming distributed resource model or the network-following distributed resource model, the electromagnetic transient program algorithm based on the adjoint matrix is used for calculation, and the dynamic processes of all power electronic components are adopted to improve the simulation accuracy of distributed resources. Within each simulation step, after the calculation of the distributed resource equivalent model is completed, the key parameters of the electromechanical transient interface equivalent model need to be given based on the calculation results. , , and quantitative values. Among them, and quantitative values are generated by the network-following distributed resource model; and quantitative values are generated by the network-forming distributed resource model.

[0065] Thus, compared with the conventional multi-rate simulation method based on the interface of the Ideal Transformer Model (ITM), the distributed resource general equivalent method and interface algorithm for multi-rate simulation of the new-type distribution network proposed in this application effectively solve the obvious waveform oscillation in the multi-rate hybrid simulation of the new-type distribution network under the access of network-forming distributed resources and network-following-network-forming hybrid distributed resources, and improve the simulation accuracy and credibility of the simulation results. Moreover, the proposed interface algorithm can be applied to the simulation of any proportion of network-forming-network-following hybrid distributed resources, and the interface circuit has universality. In addition, the electromechanical transient equivalent model of the AC system and the distributed resource equivalent model are decoupled and equivalent for the network-forming and network-following parts based on the control characteristics of the distributed resources, which speeds up their respective simulation rates, thereby improving the simulation rate of the entire hybrid simulation.

[0066] In the above simulation analysis method for the operating characteristics of the distribution network, by identifying the control modes of each distributed resource in the new-type distribution network, the identification results of each distributed resource are obtained, and the identification results are respectively sent to the electromechanical transient simulation platform and the electromagnetic transient simulation platform; among them, the distributed resources include at least one of network-following distributed resources and network-forming distributed resources; according to the identification results, an electromechanical transient system equivalent model and an electromechanical transient interface equivalent model of the AC system are built on the electromechanical transient simulation platform; according to the identification results, a distributed resource equivalent model and an electromagnetic transient interface equivalent model are built on the electromagnetic transient simulation platform; according to the electromechanical transient system equivalent model of the AC system, the electromechanical transient interface equivalent model, the distributed resource equivalent model, and the electromagnetic transient interface equivalent model, an electromechanical transient and electromagnetic transient data interaction system is established to complete the multi-rate hybrid simulation for the new-type distribution network.

[0067] Thus, compared with the conventional multi-rate simulation method based on the ideal transformer model interface, the present application can identify the control modes of various distributed resources including grid-following and grid-forming types in the new-type distribution network, and use the identification results to build different equivalent models. This enables more accurate simulation of the complex and diverse operating conditions in the new-type distribution network. Since the control modes of distributed resources have an important impact on the operating characteristics of the distribution network, through accurate identification and modeling, the accuracy and reliability of the simulation results are improved, and the operating characteristics of the actual distribution network can be better reflected. Moreover, by building an electromagnetic transient interface equivalent model and a mechanical and electrical transient interface equivalent model, and establishing a data interaction system between the mechanical and electrical transient and the electromagnetic transient, multi-rate hybrid simulation of the mechanical and electrical transient and the electromagnetic transient is achieved. This multi-rate hybrid simulation method can perform simulation analysis on the distribution network at different time scales, and can more comprehensively study the operating characteristics of the distribution network under different transient processes. The establishment of the data interaction system promotes the collaborative analysis of the two different levels of the mechanical and electrical transient and the electromagnetic transient. It enables full consideration of the mutual influence between the two levels during the simulation process, avoids the problem of inaccurate grasp of the overall system characteristics that may occur when separately performing mechanical and electrical transient or electromagnetic transient simulations, helps to more deeply analyze the coupling relationship between the mechanical and electrical processes and the electromagnetic processes in the distribution network, and improves the simulation accuracy and credibility of the simulation results.

[0068] In another embodiment, as Figure 3 shown, a flow schematic diagram of a simulation analysis method for the operating characteristics of a distribution network is provided, including the following steps:

[0069] Step S302, identify the control modes of the distributed resources in the new-type distribution network, obtain the identification results of the distributed resources, and send the identification results to the mechanical and electrical transient simulation platform and the electromagnetic transient simulation platform respectively.

[0070] Among them, for any distributed resource, when the control system of the any distributed resource contains a phase-locked loop, the computer device can determine that the identification result of the any distributed resource is that the any distributed resource is a grid-following distributed resource; when the control system of the any distributed resource does not contain a phase-locked loop, determine that the identification result of the any distributed resource is that the any distributed resource is a grid-forming distributed resource.

[0071] Step S304, according to the identification results, build an equivalent model of the mechanical and electrical transient system of the AC system on the mechanical and electrical transient simulation platform.

[0072] Step S306, according to the identification results, build an equivalent model of the distributed resource on the electromagnetic transient simulation platform.

[0073] Step S308, build an equivalent model of the mechanical and electrical transient interface on the mechanical and electrical transient simulation platform.

[0074] Step S310: Build an equivalent model of the electromagnetic transient interface on the electromagnetic transient simulation platform.

[0075] Step S312: Establish a data interaction system between the electromechanical transient and the electromagnetic transient based on the equivalent model of the AC system electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of distributed resources, and the equivalent model of the electromagnetic transient interface, so as to complete the multi-rate hybrid simulation for the new distribution network.

[0076] It should be noted that the specific limitations of the above steps can refer to the specific limitations of a simulation analysis method for the operating characteristics of a distribution network described above.

[0077] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps in other steps.

[0078] Based on the same inventive concept, the embodiments of the present application also provide a simulation analysis device for the operating characteristics of a distribution network for implementing the simulation analysis method for the operating characteristics of a distribution network involved above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the simulation analysis device for the operating characteristics of a distribution network provided below can refer to the limitations of the simulation analysis method for the operating characteristics of a distribution network in the above text, and will not be repeated here.

[0079] In an exemplary embodiment, as Figure 4 shown, a simulation analysis device for the operating characteristics of a distribution network is provided, including: an identification module 410, a first building module 420, a second building module 430, and a third building module 440, where:

[0080] The identification module 410 is configured to identify the control modes of the distributed resources in the new distribution network, obtain the identification results of the distributed resources, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively.

[0081] The first building module 420 is configured to build an equivalent model of the AC system electromechanical transient system and an equivalent model of the electromechanical transient interface on the electromechanical transient simulation platform according to the identification result.

[0082] The second building module 430 is configured to build an equivalent model of the distributed resources and an equivalent model of the electromagnetic transient interface on the electromagnetic transient simulation platform according to the identification result.

[0083] The third building module 440 is configured to establish a data interaction system between the electromechanical transient and the electromagnetic transient according to the equivalent model of the AC system electromechanical transient system, the equivalent model of the electromechanical transient interface, the equivalent model of the distributed resources, and the equivalent model of the electromagnetic transient interface, so as to complete the multi-rate hybrid simulation for the new distribution network.

[0084] In one embodiment, the first building module 420 is specifically configured to control the power output of all the grid-connected distributed resources to be 0 to generate a network-forming electromechanical model; control the power output of all the network-forming distributed resources to be 0 to generate a grid-connected electromechanical model; and build the equivalent model of the AC system electromechanical transient system on the electromechanical transient simulation platform according to the network-forming electromechanical model and the grid-connected electromechanical model.

[0085] In one embodiment, the equivalent model of the electromechanical transient interface includes an equivalent current source of the electromechanical transient interface , an equivalent voltage source of the electromechanical transient interface , a first equivalent impedance of the electromechanical transient interface , and a second equivalent impedance of the electromechanical transient interface ; the first building module 420 is specifically configured to connect the positive pole of the equivalent current source of the electromechanical transient interface and one port of the first equivalent impedance of the electromechanical transient interface to one port of the second equivalent impedance of the electromechanical transient interface to form the positive pole of the equivalent model of the electromechanical transient interface; connect the other port of the second equivalent impedance of the electromechanical transient interface to the positive pole of the equivalent voltage source of the electromechanical transient interface ; connect the negative pole of the equivalent current source of the electromechanical transient interface and the other port of the first equivalent impedance of the electromechanical transient interface to the negative pole of the equivalent voltage source of the electromechanical transient interface to form the negative pole of the equivalent model of the electromechanical transient interface.

[0086] In one embodiment, the third building module 440 is specifically configured to, within each simulation duration, for the distributed resource equivalent model, determine the quantitative values of the key parameters of the electromechanical transient interface equivalent model through the electromagnetic transient program algorithm based on the adjoint matrix; the key parameters of the electromechanical transient interface equivalent model include the electromechanical transient interface equivalent current source , the electromechanical transient interface equivalent voltage source , the first electromechanical transient interface equivalent impedance , and the second electromechanical transient interface equivalent impedance , at least one of the parameters.

[0087] In one embodiment, the electromagnetic transient interface equivalent model includes an electromagnetic transient interface equivalent current source , a first electromagnetic transient interface equivalent impedance , an electromagnetic transient interface equivalent voltage source , and a second electromagnetic transient interface equivalent impedance ; the second building module 430 is specifically configured to connect the positive pole of the electromagnetic transient interface equivalent current source and one port of the first electromagnetic transient interface equivalent impedance to one port of the second electromagnetic transient interface equivalent impedance to form the positive pole of the electromagnetic transient interface equivalent model; connect the other port of the second electromagnetic transient interface equivalent impedance to the positive pole of the electromagnetic transient interface equivalent voltage source ; connect the negative pole of the electromagnetic transient interface equivalent current source and the other port of the first electromagnetic transient interface equivalent impedance to the negative pole of the electromagnetic transient interface equivalent voltage source to form the negative pole of the electromagnetic transient interface equivalent model.

[0088] In one embodiment, the third building module 440 is specifically configured to, within each simulation duration, for the AC system electromechanical transient system equivalent model, determine the quantitative values of the key parameters of the electromagnetic transient interface equivalent model through the phasor-based quasi-steady state model; the key parameters of the electromagnetic transient interface equivalent model include the electromagnetic transient interface equivalent current source , the first electromagnetic transient interface equivalent impedance , the electromagnetic transient interface equivalent voltage source , and the second electromagnetic transient interface equivalent impedance , at least one of the parameters.

[0089] Each module in the above simulation analysis device for the operating characteristics of the distribution network can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0090] In an exemplary embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 5 shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used for exchanging information between the processor and external devices. The communication interface of the computer device is used for communicating with external terminals in a wired or wireless manner. The wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it realizes a simulation analysis method for the operating characteristics of the distribution network. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0091] Those skilled in the art can understand that Figure 5 the structure shown in

[0092] is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements. In an embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, it implements the steps in the above method embodiments.

[0093] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

[0094] In one embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the foregoing method embodiments are implemented.

[0095] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data that have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0096] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0097] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0098] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A simulation analysis method for distribution network operation characteristics, characterized in that: The method comprises: Identify the control mode of each distributed resource in the new distribution network, obtain the identification results of each distributed resource, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively; wherein the distributed resources include at least one of the following-type distributed resources and the building-type distributed resources; According to the identification results, an electromechanical transient system equivalent model of the AC system and an electromechanical transient interface equivalent model are constructed on the electromechanical transient simulation platform; According to the identification results, a distributed resource equivalent model and an electromagnetic transient interface equivalent model are built on the electromagnetic transient simulation platform; According to the electromechanical transient system equivalent model of the AC system, the electromechanical transient interface equivalent model, the distributed resource equivalent model and the electromagnetic transient interface equivalent model, a data interaction system of electromechanical transient and electromagnetic transient is established to complete the multi-rate hybrid simulation of the new distribution network.

2. The method according to claim 1, characterized in that According to the identification result, building an equivalent model of the electromechanical transient system of the AC system on the electromechanical transient simulation platform includes: Controlling the power output of all the grid-following distributed resources to be 0 to generate a grid-building electromechanical model; Controlling the power output of all the grid-forming distributed resources to be 0 to generate a grid-following electromechanical model; According to the network-building electromechanical model and the network-following electromechanical model, an equivalent model of the electromechanical transient system of the AC system is built on the electromechanical transient simulation platform.

3. The method according to claim 1, characterized in that The electromechanical transient interface equivalent model includes an electromechanical transient interface equivalent current source , electromechanical transient interface equivalent voltage source , the first electromechanical transient interface equivalent impedance And the equivalent impedance of the second electromechanical transient interface ; According to the identification result, an electromechanical transient system equivalent model of the AC system and an electromechanical transient interface equivalent model are built on the electromechanical transient simulation platform, including: The electromechanical transient interface equivalent current source The positive electrode and the first electromechanical transient interface equivalent impedance A port with the same impedance as the second electromechanical transient interface A port of is connected to form the positive pole of the electromechanical transient interface equivalent model; the second electromechanical transient interface equivalent impedance The other port is connected to the electromechanical transient interface with an equivalent voltage source The positive pole is connected; The electromechanical transient interface equivalent current source The negative pole of the first electromechanical transient interface is equivalent to the impedance The other port is connected to the electromechanical transient interface with an equivalent voltage source The negative electrode of is connected to form the negative electrode of the electromechanical transient interface equivalent model.

4. The method according to claim 3, characterized in that The establishment of a data interaction system of electromechanical transient and electromagnetic transient to complete multi-rate hybrid simulation for the new distribution network includes: In each simulation time, for the distributed resource equivalent model, the quantitative values ​​of the key parameters of the electromechanical transient interface equivalent model are determined by the electromagnetic transient program algorithm based on the adjoint matrix; the key parameters of the electromechanical transient interface equivalent model include the electromechanical transient interface equivalent current source , the electromechanical transient interface equivalent voltage source , the first electromechanical transient interface equivalent impedance And the equivalent impedance of the second electromechanical transient interface At least one parameter in .

5. The method according to claim 1, characterized in that The electromagnetic transient interface equivalent model includes an electromagnetic transient interface equivalent current source , the first electromagnetic transient interface equivalent impedance , electromagnetic transient interface equivalent voltage source And the equivalent impedance of the second electromagnetic transient interface ; According to the identification result, a distributed resource equivalent model and an electromagnetic transient interface equivalent model are built on the electromagnetic transient simulation platform, including: The electromagnetic transient interface equivalent current source The positive pole and the first electromagnetic transient interface equivalent impedance A port with the same impedance as the second electromagnetic transient interface to form the positive pole of the electromagnetic transient interface equivalent model; the second electromagnetic transient interface equivalent impedance The other port is connected to the electromagnetic transient interface with an equivalent voltage source The positive pole is connected; The electromagnetic transient interface equivalent current source The negative pole of the first electromagnetic transient interface is equivalent to the impedance The other port is connected to the electromagnetic transient interface with an equivalent voltage source to form the negative pole of the electromagnetic transient interface equivalent model.

6. The method according to claim 5, characterized in that The establishment of a data interaction system of electromechanical transient and electromagnetic transient to complete multi-rate hybrid simulation for the new distribution network includes: In each simulation time, for the electromechanical transient system equivalent model of the AC system, the quantitative values ​​of the key parameters of the electromagnetic transient interface equivalent model are determined through a quasi-steady-state model based on phasors; the key parameters of the electromagnetic transient interface equivalent model include the electromagnetic transient interface equivalent current source , the first electromagnetic transient interface equivalent impedance , the electromagnetic transient interface equivalent voltage source And the equivalent impedance of the second electromagnetic transient interface At least one parameter in .

7. A simulation and analysis device for distribution network operation characteristics, characterized in that: The device comprises: An identification module, used to identify the control mode of each distributed resource in the novel distribution network, obtain the identification results of each distributed resource, and send the identification results to the electromechanical transient simulation platform and the electromagnetic transient simulation platform respectively; A first building module is used to build an electromechanical transient system equivalent model of an AC system and an electromechanical transient interface equivalent model on the electromechanical transient simulation platform according to the identification result; A second building module is used to build a distributed resource equivalent model and an electromagnetic transient interface equivalent model on the electromagnetic transient simulation platform according to the identification result; The third building module is used to establish a data interaction system between electromechanical transient and electromagnetic transient according to the equivalent model of the electromechanical transient system of the AC system, the equivalent model of the electromechanical transient interface, the equivalent model of the distributed resource and the equivalent model of the electromagnetic transient interface, so as to complete the multi-rate hybrid simulation of the new distribution network.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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