Lightweight simulation method, device and equipment for power grid power flow and storage medium

Abstract

The invention discloses a lightweight simulation method, device and equipment for power grid power flow and a storage medium, and the method comprises the steps: obtaining a power grid simulation demand, and determining a to-be-simulated regional power grid according to the power grid simulation demand; determining each to-be-simulated power grid device based on the to-be-simulated regional power grid, and determining a power grid topological structure corresponding to the to-be-simulated regional power grid; and determining a target power flow simulation model based on the to-be-simulated power grid equipment and the power grid topological structure, and performing power flow simulation according to the target power flow simulation model. Based on the technical scheme, the corresponding regional power grid to be simulated is determined according to the simulation requirement, the corresponding target power flow simulation model is established, power flow simulation is realized according to the target power flow simulation model, the power grid simulation efficiency is further improved, the corresponding power flow simulation model can be established according to the power grid simulation requirement, and the power grid simulation efficiency is improved. Therefore, light-weight simulation of the tide flow of the power grid is realized, and the efficiency of flow simulation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid simulation, and in particular to a lightweight simulation method, device, equipment and storage medium for power grid current. Background Art

[0002] With the widespread application of distributed power sources (such as photovoltaic power generation, wind power generation, etc.) in distribution networks, the access of distributed power sources has changed the distribution system from a radial passive network to an active network with distributed small and medium-sized power sources, bringing about problems such as uncertainty in current direction and complexity in control management.

[0003] However, the traditional power flow simulation method is to obtain the topology of the model in the distribution network master station and the real-time and historical power flow data, and does not consider the impact of each distributed power source in the distribution network on the power grid, which makes the traditional power flow simulation method unable to realize the power flow simulation of the new power grid. Summary of the invention

[0004] The present invention provides a lightweight simulation method, device, equipment and storage medium for power grid current, so as to establish a corresponding power flow simulation model according to simulation requirements, and can perform power flow simulation for a new power grid.

[0005] According to one aspect of the present invention, a lightweight simulation method for power grid flow is provided, comprising:

[0006] Obtaining power grid simulation requirements, and determining a regional power grid to be simulated according to the power grid simulation requirements;

[0007] Determine each to-be-simulated power grid device based on the to-be-simulated regional power grid, and determine a power grid topology structure corresponding to the to-be-simulated regional power grid;

[0008] A target power flow simulation model is determined based on each of the power grid devices to be simulated and the power grid topology structure, and power flow simulation is performed according to the target power flow simulation model. According to another aspect of the present invention, a lightweight power grid power flow simulation device is provided, comprising:

[0009] A module for determining an area to be simulated, used to obtain a power grid simulation requirement and determine a regional power grid to be simulated according to the power grid simulation requirement;

[0010] A topology determination module, used to determine each power grid device to be simulated based on the regional power grid to be simulated, and determine a power grid topology structure corresponding to the regional power grid to be simulated;

[0011] The power flow simulation module is used to determine a target power flow simulation model based on the power grid devices to be simulated and the power grid topology structure, and perform power flow simulation according to the target power flow simulation model.

[0012] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0013] at least one processor; and

[0014] a memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the lightweight simulation method of power grid flow described in any embodiment of the present invention.

[0016] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the lightweight simulation method of power grid flow described in any embodiment of the present invention when executed.

[0017] The technical solution of the embodiment of the present invention obtains the power grid simulation requirements, and determines the regional power grid to be simulated according to the power grid simulation requirements, and then determines each power grid device to be simulated based on the regional power grid to be simulated, and determines the power grid topology structure corresponding to the regional power grid to be simulated, and finally determines the target power flow simulation model based on each power grid device to be simulated and the power grid topology structure, and performs power flow simulation according to the target power flow simulation model. Based on the above technical solution, it is realized that the corresponding regional power grid to be simulated is determined according to the simulation requirements, and the corresponding target power flow simulation model is established, and the power flow simulation is realized according to the target power flow simulation model, thereby improving the efficiency of power grid simulation, and the corresponding power flow simulation model can be established according to the power grid simulation requirements, thereby realizing lightweight simulation of power grid power flow, and improving the efficiency of power flow simulation.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a flow chart of a lightweight simulation method of power grid power flow provided by an embodiment of the present invention;

[0021] Figure 2 It is a flow chart of a lightweight simulation method of power grid power flow provided by an embodiment of the present invention;

[0022] Figure 3 It is a schematic diagram of the historical formation of a ring network topology diagram provided by an embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of a ring network diagram including a grid-connected power supply provided by an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the grid connection of a new type of power generation equipment provided by an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the device attribute setting interface provided by the embodiment of the present invention

[0026] Figure 7 This is a schematic diagram of a simplified power flow simulation of a distribution network provided by an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of a simplified power flow simulation of a distribution network provided by an embodiment of the present invention;

[0028] Fig. 9 This is a schematic diagram of a simplified power flow simulation of a distribution network provided by an embodiment of the present invention;

[0029] Fig.10 It is a structural block diagram of a lightweight simulation device for power grid flow provided by an embodiment of the present invention;

[0030] Fig.11 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] Embodiment 1

[0034] Figure 1 It is a flowchart of a lightweight simulation method for power grid current provided by an embodiment of the present invention. This embodiment can be applied to determine the corresponding regional power grid to be simulated according to the simulation requirements of the user, and establish a corresponding simulation model according to the power equipment and topology structure of the regional power grid to be simulated and complete the current simulation. The method can be executed by a lightweight simulation device for power grid current, which can be implemented in the form of hardware and / or software, and can be configured in an electronic device, which can be a terminal device or a server device, etc. Figure 1 As shown, the method includes:

[0035] S110, obtaining power grid simulation requirements, and determining a regional power grid to be simulated according to the power grid simulation requirements.

[0036] The power grid simulation requirement may be a simulation target determined according to the simulation requirement of the target user, and the simulation target may be a simulation target determined for verifying the power grid planning scheme, evaluating the system operation stability, studying the fault response strategy, personnel training, etc. The regional power grid to be simulated may be understood as the power grid area that matches the simulation requirement.

[0037] Specifically, the simulation requirements of the user are obtained, and the corresponding regional power grid to be simulated is determined according to the simulation requirements. For example, in order to verify the power grid planning scheme of the target area, the target area is taken as the focus of simulation. The corresponding power grid simulation area can also be determined according to the power grid simulation requirements. For example, the corresponding power grid equipment type can be set in the power grid simulation requirements, and the database is matched according to the power grid equipment type to determine the area containing the power grid equipment type and use it as the regional power grid to be simulated. For example, in order to realize the simulation of distributed power sources (such as photovoltaic power generation, wind power generation, etc.), the area containing distributed power sources can be used as the regional power grid to be simulated according to the requirements.

[0038] On the basis of the above technical solution, the regional power grid to be simulated is determined according to the power grid simulation requirements, including: determining the characteristics of the power grid to be simulated based on the power grid simulation requirements, matching from a power grid database according to the characteristics of the power grid to be simulated; and taking the regional power grid in the power grid database that matches the characteristics of the power grid to be simulated as the regional power grid to be simulated.

[0039] Among them, the characteristics of the power grid to be simulated can be understood as the characteristic information of the power grid corresponding to the simulation requirements, such as the size and location of the simulation area, etc., and can also be the voltage levels contained in the power grid, such as high voltage, ultra-high voltage, ultra-high voltage, etc., as well as the conversion and interconnection relationship between voltage levels; it can also be the type of power supply in the power grid, such as thermal power generation, hydropower generation, wind power generation, solar power generation, nuclear power, etc., as well as the installed capacity, distribution and operating characteristics of various power sources; the access method of the power supply, such as direct access to the power grid, access through a booster station, etc.; detailed parameters of various equipment in the power grid, such as the capacity, impedance, loss, etc. of the transformer; the resistance, reactance, and susceptance of the transmission line; and the performance parameters of switchgear such as circuit breakers and disconnectors. The power grid database can be a pre-established database for storing power grid data.

[0040] Specifically, the characteristics of the power grid to be simulated corresponding to the requirements are determined by analyzing the power grid simulation requirements, and then the power grid database is matched according to the characteristics of the power grid to be simulated, and the regional power grid in the power grid database that matches the characteristics of the power grid to be simulated is used as the regional power grid to be simulated. For example, it can be based on the characteristics of the power grid to be simulated, such as geographical location, voltage level, load level, etc., to retrieve relevant power grid data in the database, and then the retrieved power grid data is compared with the characteristics of the power grid to be simulated one by one, and the similarity and matching degree are evaluated. Finally, according to the comparison results, the power grid area that best matches the characteristics of the power grid to be simulated is screened out, and the matching degree is sorted, and the regional power grid with the highest matching degree is used as the regional power grid to be simulated. It can also be that all the matched power grid areas are displayed to the user, so that the user can select the regional power grid to be simulated based on the displayed regional power grid.

[0041] S120: Determine each power grid device to be simulated based on the regional power grid to be simulated, and determine a power grid topology structure corresponding to the regional power grid to be simulated.

[0042] The grid equipment to be simulated can be understood as the grid equipment connected to the simulation area, and can be the main equipment types contained in the grid of the simulation area, such as generators, transformers, transmission lines, circuit breakers, disconnectors, capacitors, reactors, etc. The grid topology can be the way and layout in which the various components in the grid are connected to each other through power lines and switchgear, and the grid topology corresponds to the grid of the area to be simulated.

[0043] Specifically, after determining the regional power grid to be simulated, the power grid equipment to be simulated corresponding to the regional power grid to be simulated and the power grid topology structure corresponding to the regional power grid to be simulated can be determined. For example, the power grid ledger information corresponding to the regional power grid to be simulated can be obtained, and the power grid equipment to be simulated corresponding to the regional power grid to be simulated can be determined according to the power grid ledger information, and the power grid topology structure corresponding to the regional power grid to be simulated can be queried. The technical solution of the embodiment of the present invention, when performing power grid flow simulation, only obtains the power grid topology structure corresponding to the simulation area, without obtaining the power grid operation data of the simulation area, thereby realizing rapid simulation of power grid flow, and can still realize power grid flow simulation without obtaining a large amount of data in the simulation area.

[0044] S130: Determine a target power flow simulation model based on the power grid devices to be simulated and the power grid topology structure, and perform power flow simulation according to the target power flow simulation model.

[0045] The target power flow simulation model may be understood as a simulation model corresponding to the target simulation requirement.

[0046] Specifically, a target power flow simulation model is determined based on each power grid device to be simulated and the power grid topology structure, and power flow simulation is performed according to the target power flow simulation model. Exemplarily, detailed parameters of all power grid devices to be simulated may be collected, including active and reactive output limits of generators, transformation ratio and loss of transformers, impedance and admittance of transmission lines, etc., and then, according to the power grid topology structure, the connection relationship and electrical parameters between each device are clarified, and a power grid model is established in the power system simulation software according to the power grid topology structure and equipment parameters, and according to the simulation requirements, the operating conditions of the power grid are set, such as load level, generator output, system voltage, etc., and the power flow calculation program is started in the simulation software, the set operating conditions are input, and the simulation calculation is performed.

[0047] On the basis of the above technical scheme, the target power flow simulation model is determined based on the power grid devices to be simulated and the power grid topology structure, including: obtaining a power grid equipment inventory corresponding to the regional power grid to be simulated, and determining the power grid equipment type corresponding to the power grid devices to be simulated based on the power grid equipment inventory; determining the target power supply equipment from the power grid devices to be simulated based on the power grid equipment type, and determining the equipment attribute value corresponding to the target power supply equipment; determining the target power flow simulation model based on the equipment attribute value of the target power supply equipment and the power grid topology structure.

[0048] Among them, the power grid equipment ledger can be a document used to record the information of power equipment in the power grid to be simulated. The power grid equipment type can be understood as the equipment type of each power grid equipment, such as switch equipment, power supply equipment, transformer equipment, substation equipment, etc. The target power supply equipment can be understood as a power supply equipment that matches the pre-set power supply equipment type, for example, it can be a step-up transformer for processing, such as for small hydropower power generation and photovoltaic power generation. Small hydropower generation is generated by a small hydropower generator, and then through a step-up transformer, connected to the distribution network line, photovoltaic power generation is collected by the photovoltaic array and connected to the inverter, converted into AC, and then stepped up by a step-up transformer and connected to the distribution network line. For the scenario of distributed power access, the equipment data of the electronic transfer and maintenance of the equipment center covers the step-up transformer of the grid-connected line, so the ring network diagram can be generated to the step-up transformer connected to the power supply. The device attribute value can be understood as the attribute value corresponding to the power equipment set in the power grid topology diagram.

[0049] Specifically, the grid equipment ledger corresponding to the regional power grid to be simulated is obtained, and the grid equipment type corresponding to each grid equipment to be simulated is determined according to the grid equipment ledger, and then the target power supply equipment is determined from each grid equipment to be simulated based on the grid equipment type, and the equipment attribute value corresponding to the target power supply equipment is determined, and finally the target power flow simulation model can be determined based on the equipment attribute value of the target power supply equipment and the grid topology. Exemplarily, the grid equipment ledger corresponding to the regional power grid to be simulated is obtained. The grid equipment ledger is a document that records the basic information of all equipment in the power grid, including the name, model, specification, manufacturer, commissioning date, technical parameters, etc. of the equipment. According to the grid equipment ledger, the equipment type corresponding to each grid equipment to be simulated can be identified. Equipment types generally include generators, transformers, transmission lines, circuit breakers, loads, etc. After determining the equipment type, it is necessary to screen out the target power supply equipment from each grid equipment to be simulated. The target power supply equipment is a device that provides electrical energy in the power grid, mainly including generators and certain types of energy storage devices. For these target power devices, it is necessary to further determine their device attribute values, such as the active output of the generator, reactive output limit, voltage regulation range, etc. Finally, based on the device attribute values ​​of the target power devices and the power grid topology, a target power flow simulation model can be constructed. For example, the basic framework of the power grid can be established in the simulation software, including the preliminary settings of nodes (busbars), branches (transmission lines, transformers, etc.) and equipment. According to the power grid equipment ledger and the device attribute values ​​of the target power devices, the detailed parameters of each device are configured in the simulation model, and the power grid topology is mapped to the simulation model to ensure that the connection relationship between each device in the model is consistent with the actual power grid.

[0050] Based on the above technical solution, the target power supply device is determined from the power grid devices to be simulated based on the power grid device type, including: matching based on a preset device type and the power grid device type, and determining the target power supply device matching the preset device type.

[0051] Among them, the preset device type can be a pre-set power supply device type, which can include photovoltaic power supply, small hydropower power supply, wind power supply, biomass power supply, etc.

[0052] Specifically, based on the matching between the preset device type and the power grid equipment type, the target power supply equipment that matches the preset device type is determined. For example, the target power supply equipment is determined by pre-setting the preset device type. The preset device types include photovoltaic power supply, small hydropower power supply, wind power supply, biomass power supply, etc., and then the equipment type in the power grid equipment ledger is matched with the preset equipment type. Each item in the power grid equipment ledger can be traversed, its equipment type field is checked, and compared with the preset equipment type list. In the matching process, the equipment that matches the preset equipment type is identified, and then the target power supply equipment is determined.

[0053] On the basis of the above technical solution, the determination of the device attribute value corresponding to the target power supply device includes: when the target power supply device is a step-up transformer power supply device, obtaining the energy type corresponding to the target power supply device; and determining the device attribute value corresponding to the target power supply device based on the energy type.

[0054] Among them, the step-up transformer can be a device that generates electromotive force in the wire through the change of magnetic field, thereby converting low voltage into high voltage, and is used to increase the low voltage electric energy generated by power generation to the high voltage required by the transmission line to reduce the power loss during the transmission process. The energy type can be understood as the source of electricity, such as thermal power generation, photovoltaic power generation, hydropower generation, wind power generation, etc.

[0055] Specifically, when the target power supply device is a step-up transformer, the energy type corresponding to the target power supply device is obtained, and then the device attribute value corresponding to the target power supply device is determined based on the energy type. For example, the energy type corresponding to the step-up transformer can be determined by consulting the power grid equipment ledger. The energy type determines the source of electric energy connected to the step-up transformer and its characteristics, such as thermal power generation, photovoltaic power generation, hydropower generation, wind power generation, etc. After determining the energy type, the device attribute value corresponding to the step-up transformer can be determined according to the characteristics of the type of electric energy. In the transformer attribute, whether it is a step-up transformer, if so, the attribute value is 1, otherwise the attribute value is 0. If it is a step-up transformer, in the secondary attribute, the photovoltaic power source, the attribute value is 1, the small hydropower, the attribute value is 2, the wind power, the attribute value is 3, the biomass power generation, the attribute value is 4, and the geothermal power generation, the attribute value is 5. If it is a step-up transformer, the power is displayed as negative, and then the device attribute value corresponding to the target power supply device is determined.

[0056] On the basis of the above technical solution, the target power flow simulation model is determined based on the device attribute value of the target power device and the power grid topology structure, including: when the device attribute value matches the preset device attribute, obtaining the device line position corresponding to the target power device; determining the device completion scheme corresponding to the target power device based on the device line position, and determining the target power flow simulation model according to the device completion scheme and the power grid topology structure.

[0057] The preset device attribute may be a pre-set device attribute value. The device line location may be understood as the location information of the target power device in the line. The device completion solution may be a solution for completing the power grid topology diagram.

[0058] Specifically, when the device attribute value matches the preset device attribute, the device line position corresponding to the target power device is obtained, and then the device completion scheme corresponding to the target power device is determined based on the device line position, and the target power flow simulation model is determined according to the device completion scheme and the power grid topology. For example, after the device attribute is successfully matched, the specific position of the target power device in the power grid, that is, the device line position, can be obtained. The power grid equipment account and geographic information system (GIS) can be consulted to determine the device line position, and then based on the device line position, whether there are missing or imperfect parts in the current power grid topology, such as unconnected lines, missing switchgear, incomplete protection system, etc., and the corresponding device completion scheme is determined, which may include adding new lines, switchgear, protection devices, etc. When generating a ring network diagram, it can be further analyzed whether the single radiation branch terminal device of the ring network path is a photovoltaic or small hydropower transformer. If it is a power branch line, it is necessary to generate the incoming and outgoing line switches, disconnectors, switch rooms, transformers and other equipment on this branch line.

[0059] On the basis of the above technical solution, the power flow simulation is performed according to the target power flow simulation model, including: determining the power flow calculation nodes based on the target power flow simulation model, and determining the power direction corresponding to each power flow calculation node; performing power flow simulation based on the power direction, each power flow calculation node and the target power flow simulation model.

[0060] The power flow calculation node may be a key node for power flow calculation, and may be a generator, a transformer, a bus, a switch, a load, etc. The power direction may be understood as the direction of the flow of electric energy between nodes in the power grid topology diagram.

[0061] Specifically, the power flow calculation nodes are determined based on the target power flow simulation model, and the power direction corresponding to each power flow calculation node is determined, and then the power flow simulation is performed based on the power direction, each power flow calculation node and the target power flow simulation model. For example, for each power flow calculation node, its power direction needs to be determined, and the power direction corresponding to each node can be determined according to the type of node and the operating status of the power grid. For example, the generator node is usually regarded as the power emission point, and its power direction is outward; while the load node is regarded as the power consumption point, and its power direction is inward. Then, the power flow simulation calculation is performed based on the determined power flow calculation nodes and power directions, for example, using the Newton-Raphson method, the PQ decomposition method, etc. It should be noted that after the power flow simulation calculation is completed, the simulation results need to be verified. The verification process includes checking whether the simulation results meet the constraints of the power grid, whether the voltage and power of each node are within a reasonable range, and whether the power flow distribution of the power grid conforms to the actual situation. If it is found that the simulation results do not meet expectations or there are errors, it is necessary to return to check whether there are problems with the simulation model, parameter settings or calculation methods, and make corresponding adjustments.

[0062] The technical solution of the embodiment of the present invention obtains the power grid simulation requirements, and determines the regional power grid to be simulated according to the power grid simulation requirements, and then determines each power grid device to be simulated based on the regional power grid to be simulated, and determines the power grid topology structure corresponding to the regional power grid to be simulated, and finally determines the target power flow simulation model based on each power grid device to be simulated and the power grid topology structure, and performs power flow simulation according to the target power flow simulation model. Based on the above technical solution, it is realized that the corresponding regional power grid to be simulated is determined according to the simulation requirements, and the corresponding target power flow simulation model is established, and the power flow simulation is realized according to the target power flow simulation model, thereby improving the efficiency of power grid simulation, and the corresponding power flow simulation model can be established according to the power grid simulation requirements, thereby realizing lightweight simulation of power grid power flow, and improving the efficiency of power flow simulation.

[0063] Embodiment 2

[0064] Figure 2 A flowchart of a lightweight simulation method for power grid flow provided by an embodiment of the present invention. This embodiment further introduces a lightweight simulation method for power grid flow based on the above embodiment. The specific implementation method can refer to the technical solution of this embodiment. Among them, the technical terms that are the same or corresponding to the above embodiment are not repeated here.

[0065] It should be noted that in recent years, distribution automation has become more and more popular, and the simulation of distribution automation for training, assessment and competition has become more and more urgent. However, the existing distribution network automation simulation of each prefecture-level bureau is "bundled" with the distribution network master station, directly quoting the topology of the model in the distribution network master station and the real-time and historical flow data. Although there is no topology and flow simulation problem, it lacks universality and lightweight characteristics in the professional assessment and competition of the whole province or the whole southern power grid. It is impossible to achieve lightweight construction, and it is also impossible to adapt to the candidates of each prefecture-level bureau in the whole network. Therefore, it is more and more urgent to build a simple distribution network simulation device with simple flow changes to adapt to accident handling and power transfer operations. In the simple flow simulation device of the distribution network, the existing solution is to take a certain flow section as the simulated flow. The flow of the existing distribution master station is from the on-site collection device, which changes in real time according to the measured data. The flow section taken by the simple flow simulation device has no association with the distribution network topology, and there are the following problems: 1. The change process of the flow cannot be displayed at all during the accident handling and power transfer process; 2. The reverse flow display for new energy is even more impossible to achieve.

[0066] Determine the simulation topology diagram: Specifically, according to the ring network diagram drawing specifications, the ring network diagram drawing range includes switches, wires and other equipment on the ring network path formed by the feeder and the contact line, such as Figure 3 As shown in the figure, the ring network diagram emphasizes the relationship between the ring network connections between feeders through visual means such as coloring the feeders and highlighting the ring network switches. For grid-connected photovoltaic stations, small hydropower stations and other power lines, the power lines are basically single-radial branches. Previously, the ring network diagram did not support the generation of single-radial lines. Therefore, in order to effectively support the dispatching business application, the ring network diagram drawing function needs to be optimized and transformed. The ring network diagram containing the grid-connected power supply is as follows Figure 4 shown.

[0067] Furthermore, if Figure 5 As shown in the figure, from the perspective of the wiring of the main power generation equipment, small hydropower generation is generated by small hydropower generators, and then connected to the distribution network through step-up transformers. Photovoltaic power generation is collected by the photovoltaic array and connected to the inverter, converted into AC power, and then stepped up by the step-up transformer and connected to the distribution network. For the scenario of distributed power supply access, the equipment data electronically handed over and maintained by the equipment center covers the step-up transformer of the grid-connected line, so the ring network diagram can be generated to the step-up transformer connected to the power supply. The equipment ledger specification expands the distribution network transformer to two sub-types: photovoltaic and small hydropower. For example, Figure 6As shown, the graphic modeling tool simultaneously expands the icons of photovoltaic and small hydropower. When the draftsman electronically transfers the maintenance equipment, he needs to set the correct transformer type. In the transformer attribute, whether it is a step-up transformer, if so, the attribute value is 1, otherwise the attribute value is 0. If it is a step-up transformer, in the secondary attributes, the photovoltaic power source, the attribute value is 1, the small hydropower, the attribute value is 2, the wind power, the attribute value is 3, the biomass power generation, the attribute value is 4, and the geothermal power generation, the attribute value is 5. If the step-up transformer is reversed, the displayed power is negative.

[0068] Finally, when generating the ring network diagram, further analyze whether the single-radiation branch terminal equipment of the ring network path T is a photovoltaic or small hydropower transformer. If it is a power branch line, it is necessary to generate the incoming and outgoing line switches, disconnectors, switch rooms, transformers and other equipment on this branch line, and add the power line layout typesetting function. Photovoltaic and small hydropower transformers are displayed using independent icons, and key attributes such as the transformer name, model, and rated capacity are annotated with text. It should be noted that the transformers of the single-line diagram CIM / SVG file are synchronously exported as photovoltaic and small hydropower types.

[0069] Lightweight simulation of power grid flow: Specifically, the power direction from the substation to the open-loop point is defined as forward, and the power is marked as "positive"; the power direction from the trunk to the branch is defined as forward, and the power is marked as "positive". The power direction from the distribution transformer to the line is defined as reverse, and the power is marked as "negative"; the power direction from the branch to the trunk is defined as reverse, and the power is marked as "negative". The power direction from the line to the substation is defined as reverse, and the power is marked as "negative"; the Newton-Raphson method, based on the power grid topology, starts from the distribution transformer, the branch, and the network substation to accumulate, calculate the active power of each branch switch, each section switch, and each substation feeder switch, and display it.

[0070] like Figure 7 As shown in Figure 2, when performing a simple power flow simulation of a distribution network containing new energy based on topology, Figure 7 In the distribution network, the load of line L2 is 200A, and the 602 switch of L2#1 ring main unit shows that the load current of the latter section of the line is 200A. The photovoltaic power source is connected to the busbar of L2#1 ring main unit, and the active current of power generation is 50A. Based on the topology of the distribution network and the rule that power generation and load are offset, the current felt by the 601 switch of L2#1 ring main unit is: 200+(-50)=150A, realizing the trend display of new energy. Similarly, based on the topology of the distribution network, the load current of CB2 switch is also not 150A. Figure 8 As shown in the figure, in the simple power flow simulation of the topology-based distribution network power supply process, Figure 8In the distribution network, the open-loop point of L1 and L3 is the 601 switch of L3#4 ring main unit. The load of both lines is 300A. When the CB3 switch needs to be repaired, the load of L3 must be transferred to L1 for power supply. Based on the topology, the flow of L3 will be reversed, and the flow of each node of the L1 line will be required to be synchronously superimposed with the load current of L3 300A. Fig. 9 As shown in the figure, in the simple power flow simulation of the distribution network branch fault handling process based on topology, Fig. 9 In the distribution network, assuming that the 603 branch of the L1#1 ring main unit fails, the 603 switch must be disconnected, then the load current of the 603 switch is 0. At the same time, based on the topology, the bus node of the L1#1 ring main unit, the branch load is 0, then the load current of the incoming and outgoing line switches of the ring main unit is equal, both 200A.

[0071] The technical solution of the embodiment of the present invention obtains the power grid simulation requirements, and determines the regional power grid to be simulated according to the power grid simulation requirements, and then determines each power grid device to be simulated based on the regional power grid to be simulated, and determines the power grid topology structure corresponding to the regional power grid to be simulated, and finally determines the target power flow simulation model based on each power grid device to be simulated and the power grid topology structure, and performs power flow simulation according to the target power flow simulation model. Based on the above technical solution, it is realized that the corresponding regional power grid to be simulated is determined according to the simulation requirements, and the corresponding target power flow simulation model is established, and the power flow simulation is realized according to the target power flow simulation model, thereby improving the efficiency of power grid simulation, and the corresponding power flow simulation model can be established according to the power grid simulation requirements, thereby realizing lightweight simulation of power grid power flow, and improving the efficiency of power flow simulation.

[0072] Embodiment 3

[0073] Fig.10 The structure block diagram of a lightweight simulation device for power grid flow provided by an embodiment of the present invention. Fig.10 As shown, the device includes: a module 1010 for determining an area to be simulated, a module 1020 for determining a topology structure, and a module 1030 for simulating a power flow.

[0074] The module 1010 for determining the area to be simulated is used to obtain the power grid simulation requirements and determine the regional power grid to be simulated according to the power grid simulation requirements;

[0075] A topology determination module 1020 is used to determine each to-be-simulated power grid device based on the to-be-simulated regional power grid, and determine a power grid topology structure corresponding to the to-be-simulated regional power grid;

[0076] The power flow simulation module 1030 is used to determine a target power flow simulation model based on the power grid devices to be simulated and the power grid topology structure, and perform power flow simulation according to the target power flow simulation model.

[0077] On the basis of the above technical solution, the module for determining the area to be simulated is used to determine the characteristics of the power grid to be simulated based on the power grid simulation requirements, and match it from the power grid database according to the characteristics of the power grid to be simulated; and use the regional power grid in the power grid database that matches the characteristics of the power grid to be simulated as the regional power grid to be simulated.

[0078] On the basis of the above technical solution, the topology structure determination module is used to obtain the grid equipment inventory corresponding to the regional grid to be simulated, and determine the grid equipment type corresponding to each grid equipment to be simulated based on the grid equipment inventory; determine the target power supply equipment from the grid equipment to be simulated based on the grid equipment type, and determine the equipment attribute value corresponding to the target power supply equipment; determine the target power flow simulation model based on the equipment attribute value of the target power supply equipment and the grid topology structure.

[0079] On the basis of the above technical solution, the topology structure determination module is used to match the preset device type and the power grid device type to determine the target power supply device that matches the preset device type.

[0080] Based on the above technical solution, the topology structure determination module is used to obtain the energy type corresponding to the target power supply device when the target power supply device is a step-up transformer power supply device; and determine the device attribute value corresponding to the target power supply device based on the energy type.

[0081] On the basis of the above technical solution, the topology structure determination module is used to obtain the device line location corresponding to the target power supply device when the device attribute value matches the preset device attribute; determine the device completion plan corresponding to the target power supply device based on the device line location, and determine the target power flow simulation model according to the equipment completion plan and the power grid topology structure.

[0082] Based on the above technical solution, the power flow simulation module is used to determine the power flow calculation nodes based on the target power flow simulation model, and determine the power direction corresponding to each power flow calculation node; and perform power flow simulation based on the power direction, each power flow calculation node and the target power flow simulation model.

[0083] The technical solution of the embodiment of the present invention obtains the power grid simulation requirements, and determines the regional power grid to be simulated according to the power grid simulation requirements, and then determines each power grid device to be simulated based on the regional power grid to be simulated, and determines the power grid topology structure corresponding to the regional power grid to be simulated, and finally determines the target power flow simulation model based on each power grid device to be simulated and the power grid topology structure, and performs power flow simulation according to the target power flow simulation model. Based on the above technical solution, it is realized that the corresponding regional power grid to be simulated is determined according to the simulation requirements, and the corresponding target power flow simulation model is established, and the power flow simulation is realized according to the target power flow simulation model, thereby improving the efficiency of power grid simulation, and the corresponding power flow simulation model can be established according to the power grid simulation requirements, thereby realizing lightweight simulation of power grid power flow, and improving the efficiency of power flow simulation.

[0084] The lightweight simulation device for power grid flow provided in the embodiment of the present invention can execute the lightweight simulation method for power grid flow provided in any embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method.

[0085] Embodiment 4

[0086] Fig.11 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0087] like Fig.11 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0088] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0089] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a lightweight simulation method for power grid flow.

[0090] In some embodiments, the lightweight simulation method of power grid flow can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the lightweight simulation method of power grid flow described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the lightweight simulation method of power grid flow by any other appropriate means (for example, by means of firmware).

[0091] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0092] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0093] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0094] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0095] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0096] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0097] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0098] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lightweight simulation method for power grid flow, characterized in that: include: Obtaining power grid simulation requirements, and determining a regional power grid to be simulated according to the power grid simulation requirements; Determine each power grid device to be simulated based on the regional power grid to be simulated, and determine a power grid topology structure corresponding to the regional power grid to be simulated; A target power flow simulation model is determined based on each of the power grid devices to be simulated and the power grid topology structure, and power flow simulation is performed according to the target power flow simulation model.

2. The method according to claim 1, characterized in that The step of determining a regional power grid to be simulated according to the power grid simulation requirement includes: Determine the characteristics of the power grid to be simulated based on the power grid simulation requirements, and perform matching from a power grid database according to the characteristics of the power grid to be simulated; The regional power grid in the power grid database that matches the characteristics of the power grid to be simulated is used as the regional power grid to be simulated.

3. The method according to claim 1, characterized in that: The step of determining a target power flow simulation model based on each of the power grid devices to be simulated and the power grid topology structure includes: Obtaining a grid equipment ledger corresponding to the regional grid to be simulated, and determining a grid equipment type corresponding to each grid equipment to be simulated according to the grid equipment ledger; Determine a target power supply device from the power supply devices to be simulated based on the power supply device type, and determine a device attribute value corresponding to the target power supply device; A target power flow simulation model is determined based on the device attribute value of the target power supply device and the power grid topology structure.

4. The method according to claim 3, characterized in that The step of determining a target power supply device from each of the power grid devices to be simulated based on the power grid device type includes: Based on matching between a preset device type and the power grid device type, a target power supply device matching the preset device type is determined.

5. The method according to claim 3, characterized in that: The determining of the device attribute value corresponding to the target power device includes: In the case where the target power supply device is a step-up power supply device, obtaining an energy type corresponding to the target power supply device; A device property value corresponding to the target power device is determined based on the energy type.

6. The method according to claim 3, characterized in that: The determining of the target power flow simulation model based on the device attribute value of the target power supply device and the power grid topology structure includes: When the device attribute value matches the preset device attribute, obtaining a device line location corresponding to the target power device; An equipment completion solution corresponding to the target power supply equipment is determined based on the equipment line position, and a target power flow simulation model is determined according to the equipment completion solution and the power grid topology structure.

7. The method according to claim 1, characterized in that The performing power flow simulation according to the target power flow simulation model comprises: Determining power flow calculation nodes based on the target power flow simulation model, and determining power directions corresponding to the power flow calculation nodes; A power flow simulation is performed based on the power direction, the power flow calculation nodes and the target power flow simulation model.

8. A lightweight simulation device for power grid flow, characterized in that: include: A module for determining an area to be simulated, used to obtain a power grid simulation requirement and determine a regional power grid to be simulated according to the power grid simulation requirement; A topology determination module, used to determine each power grid device to be simulated based on the regional power grid to be simulated, and determine a power grid topology structure corresponding to the regional power grid to be simulated; The power flow simulation module is used to determine a target power flow simulation model based on the power grid devices to be simulated and the power grid topology structure, and perform power flow simulation according to the target power flow simulation model.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the lightweight simulation method for power grid flow according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the lightweight simulation method for power grid power flow according to any one of claims 1 to 7 when executed.

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