Power grid topology snapshot method, system, device, equipment and medium based on power flow

Abstract

The present invention relates to the field of power grids, and in particular to a method, system, device, equipment and medium for taking a snapshot of power grid topology based on power flow. The method comprises: obtaining waveform data of current and voltage at each node of the power grid at the same time; calculating power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtaining power flow at each node of the power grid, and vectorizing the topological structure of the power grid; converting the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectorized power grid, and obtaining the topological structure of the power grid at the current moment. Real-time holographic monitoring of wide-area or regional microgrids and continuous high-precision monitoring of carbon emissions of the entire chain of hybrid power grids are realized. The carbon emissions of the entire power grid can be accurately and timely calculated, solving the problem of measurement and traceability of carbon emissions of electricity. The accuracy and real-time performance of the existing power grid topology analysis can be improved, solving the problems of low accuracy and poor real-time performance caused by the slow update speed of the original power flow analysis method.

Description

Technical Field

[0001] The present invention relates to the field of power grid technology, and in particular to a power grid topology snapshot method, system, device, computer equipment and readable storage medium based on power flow. Background Art

[0002] The large-scale access of centralized wind power and photovoltaic power has aggravated the randomness and volatility of the power generation side, and the power generation output cannot be controlled on demand. At the same time, on the power consumption side, the access of a large number of distributed new energy sources has also greatly reduced the accuracy of load metering and prediction; wind power, photovoltaic power generation and other power generation methods all require thermal power units as peak-shaving backups, which may be put into use at any time due to the reduction of new energy power generation. This causes the power composition on the power generation side to change at any time. At the same time as the power generation side changes, the access of various loads on the power consumption side also changes at any time. Under the condition that the power generation side and the power consumption side change at the same time, the power grid topology will also change significantly, which will lead to changes in the carbon flow in the power grid and deviations in the actual carbon consumption accounting.

[0003] The existing technology for analyzing power grids is mainly based on the theory of power flow analysis. The main reference data comes from the timed upload of electricity meter data from each power supply and power consumption gateway (minimum 15 minutes), which can effectively analyze the original slow-changing thermal power supply network. After the large-scale access of new energy, parameters such as the proportion of electric energy, actual power, and waveform distortion change randomly and affect each other. In addition, the uncertainty of the power generation output of new energy and the increasingly complex topology of the power grid change the topology of the power grid quickly, and there will be obvious changes within 1 minute. The original simple power flow analysis method has slow data update speed and poor synchronization, resulting in a decrease in the accuracy of simple power flow analysis, poor real-time performance, and cannot effectively reflect the real topological state. Summary of the invention

[0004] In order to solve the above-mentioned problems of the prior art, the present invention provides a power grid topology snapshot method, system and device based on power flow. The clock-synchronized low-latency power grid topology vector snapshot based on power flow analysis can improve the accuracy and real-time performance of the existing power grid topology analysis, and solves the problems of low accuracy and poor real-time performance caused by the rapid change of power grid topology in the hybrid power supply mode and the slow update speed of the original power flow analysis method. It can realize real-time holographic monitoring of wide-area or regional microgrids and continuous real-time and high-precision topology monitoring of the entire chain emission of hybrid power grids.

[0005] The present invention provides a power grid topology snapshot method based on power flow, comprising the following steps:

[0006] Obtain the waveform data of current and voltage at each node of the power grid at the same time;

[0007] Calculating power quality parameters based on waveform data of current and voltage at each node of the power grid, obtaining power flow at each node of the power grid, and vectorizing the topological structure of the power grid;

[0008] By performing topological analysis on the vectored power grid, the hybrid structure of the power grid is transformed into a multi-root tree structure with clear power supply links, and the topological structure of the power grid at the current moment is obtained.

[0009] Furthermore, the waveform data of the current and voltage at each node of the power grid are obtained by installing a high-speed, low-latency, bidirectional electric energy metering device and an electric energy quality detection device at the node exit of the power plant of the power grid and each substation node of the power grid.

[0010] Furthermore, the electric energy metering device and the electric energy quality detection device are clock synchronized via GPS satellites or BeiDou satellites.

[0011] Furthermore, the power quality parameters include the values ​​of voltage, current, power and electric energy as well as harmonics and waveform distortion.

[0012] Furthermore, the steps of calculating power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtaining power flow at each node of the power grid, and vectorizing the power grid topology structure specifically include:

[0013] Based on the power quality parameters, determine the power generation status of each independent power supply source of the power grid at the current moment, the sources of different power supply lines at the entrances of each level of power distribution units, and the on / off status of each power-consuming device;

[0014] Solidify the composition ratio and power flow direction of the power grid at the current moment, make the power generation and consumption of each point in the power grid clear, and determine the directionality of electric energy, so as to vectorize the topology of the power grid.

[0015] Furthermore, the step of converting the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid specifically includes:

[0016] In the vectored power grid topology, after eliminating the non-generating power supply sources, non-power-consuming equipment, and unused distribution units, the ring network type hybrid complex power grid structure is decomposed and simplified into a multi-root tree structure with clear links.

[0017] In order to solve the above-mentioned prior art problems, the present invention further provides a power grid topology snapshot system based on power flow, comprising:

[0018] An acquisition module is used to acquire waveform data of current and voltage at each node of the power grid at the same time;

[0019] A calculation and vectorization module, used to calculate power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtain the power flow at each node of the power grid, and vectorize the topology of the power grid;

[0020] The conversion module is used to convert the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid, so as to obtain the topological structure of the power grid at the current moment.

[0021] In order to solve the above-mentioned problems of the prior art, the present invention also provides a power grid topology snapshot device based on flow, including: a front-end sampling module and a data analysis background arranged in the power grid, the front-end sampling module includes multiple channels and multiple groups of voltage sampling units and current sampling units, and the data analysis background includes a sampling analysis unit, a Beidou satellite timing unit and a 5G communication unit.

[0022] In order to solve the above-mentioned problems of the prior art, the present invention also provides a computer device, comprising at least one processor, at least one memory and a data bus; wherein: the processor and the memory communicate with each other through the data bus; the memory stores a program executed by the processor to implement the power grid topology snapshot method based on flow.

[0023] The present invention also provides a computer-readable storage medium, on which computer-readable instructions are stored. When the computer-readable instructions are executed by a processor, the steps of the power grid topology snapshot method based on power flow are implemented.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] The present invention provides a power grid topology snapshot method based on power flow, and a clock-synchronized low-latency power grid topology vector snapshot based on power flow analysis, which can improve the accuracy and real-time performance of existing power grid topology analysis, solve the problems of low accuracy and poor real-time performance caused by the rapid change of power grid topology and slow update speed of the original power flow analysis method in the hybrid power supply mode, and can realize real-time holographic monitoring of wide-area or regional microgrids and continuous real-time and high-precision topology monitoring of the entire chain emission of hybrid power grids. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1It is a flow chart of a power grid topology snapshot method based on power flow provided by an embodiment of the present invention;

[0028] Figure 2 It is a flowchart of the steps of calculating power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtaining the power flow at each node of the power grid, and vectorizing the topological structure of the power grid in an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the ring network type hybrid complex power grid structure provided by an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of a multi-root tree structure with clear power supply links provided by an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of functional modules of a power grid topology snapshot system based on power flow provided by an embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of a power grid topology snapshot device based on power flow provided by an embodiment of the present invention;

[0033] Figure 7 The present invention is a schematic diagram of the structure of a computer device provided by the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, an embodiment of the present invention provides a power grid topology snapshot method based on power flow, comprising the following steps:

[0037] S101, obtaining waveform data of current and voltage at each node of the power grid at the same time;

[0038] S102, calculating power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtaining power flow at each node of the power grid, and vectorizing the topology of the power grid;

[0039] S103, by performing topological analysis on the vectored power grid, the hybrid structure of the power grid is converted into a multi-root tree structure with clear power supply links, so as to obtain the topological structure of the power grid at the current moment.

[0040] Among them, the waveform data of the current and voltage at each node of the power grid can be obtained by installing a high-speed, low-latency, bidirectional electric energy metering device and a power quality detection device at the node exit of the power plant and each substation node of the power grid. The sampling rate of the high-speed, low-latency, bidirectional electric energy metering device and the power quality detection device is not less than 6400Hz, the data transmission speed is not less than 200 times / second, and the data transmission bandwidth is not less than 10Mb / s.

[0041] The electric energy metering device and the electric energy quality detection device are clock synchronized through GPS satellites or Beidou satellites. The timing accuracy of GPS or Beidou satellites is less than 20ms, and the timing accuracy of lost satellites is no more than 20us. Clock synchronization of the electric energy metering device and the electric energy quality detection device through high-precision satellites can improve the real-time and synchronization of power grid data collection.

[0042] The power quality parameters include the values ​​of voltage, current, power and electric energy, as well as harmonics and waveform distortion. The power flow of each node is obtained through the above power quality parameters, the power grid topology is vectorized, and then the complex power grid hybrid structure is converted into a multi-root tree structure with clear power supply links through topological analysis, and the topology of the power grid at the current moment can be obtained based on the multi-root tree structure with clear power supply links.

[0043] Further, such as Figure 2 As shown, the steps of calculating the power quality parameters based on the waveform data of the current and voltage at each node of the power grid, obtaining the power flow at each node of the power grid, and vectorizing the power grid topology structure specifically include:

[0044] S1021, determining the power generation status of each independent power supply source of the power grid at the current moment, the sources of different power supply lines at the entrances of each level of power distribution units, and the on / off status of each power-consuming device based on the power quality parameters;

[0045] S1022. Solidify the current power grid power supply component ratio and power flow direction, make the power generation and consumption of each point in the power grid clear, and determine the directionality of the electric energy, so as to vectorize the power grid topology.

[0046] Furthermore, the step of converting the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid specifically includes:

[0047] In the vectored power grid topology, after eliminating the non-generating power supply sources, non-power-consuming equipment, and unused distribution units, the ring network type hybrid complex power grid structure is decomposed and simplified into a multi-root tree structure with clear links.

[0048] Specifically, the multi-channel, multi-group electric energy metering device and electric energy quality detection device can quickly acquire and transmit the waveform data of current and voltage of each node of the power grid for synchronous work under the condition of strict clock synchronization (second-level synchronization) through GPS satellite or Beidou satellite, and can synchronously sample the voltage, current, power and other parameters of the multi-channel power supply lines at the same time. By analyzing the power situation of each line, the power generation status of each independent power supply source at the current moment can be clarified, that is, whether it is generating electricity, how much power is generated, the source of different power supply lines at the entrance of each level of distribution unit, the opening and closing status of each power-consuming equipment, etc., so that the component proportion and power flow direction of the power supply of the power grid at the current moment can be solidified, the power generation and power consumption of each point in the power grid can be clarified, the directionality of the electric energy can be determined, and the power grid topology structure can be vectorized; then, after eliminating the non-generated power supply sources, non-power-consuming equipment, and unused distribution units in the vectorized power grid topology structure, the ring network type mixed complex power grid structure (such as Figure 3 As shown in the figure, it is decomposed and simplified into a multi-root tree structure with clear links (such as Figure 4 As shown), the topological structure of the power grid at the current moment is obtained.

[0049] Through the various steps of the above-mentioned power flow-based grid topology snapshot method, a clock-synchronized low-latency grid topology structure vector snapshot can be obtained based on power flow analysis, which can improve the accuracy and real-time performance of the existing power grid topology analysis, and solve the problems of low accuracy and poor real-time performance caused by the rapid change of grid topology in the hybrid power supply mode and the slow update speed of the original power flow analysis method. It can realize real-time holographic monitoring of wide-area or regional microgrids and continuous real-time and high-precision topology monitoring of the entire chain emissions of hybrid power grids.

[0050] Embodiment 2:

[0051] like Figure 5 As shown, the embodiment of the present invention further provides a power grid topology snapshot system based on power flow, and the power grid topology snapshot system based on power flow specifically includes:

[0052] Acquisition module 1, used to acquire waveform data of current and voltage at each node of the power grid at the same time;

[0053] A calculation and vectorization module 2, used to calculate power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtain the power flow at each node of the power grid, and vectorize the topology of the power grid;

[0054] The conversion module 3 is used to convert the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid, so as to obtain the topological structure of the power grid at the current moment.

[0055] The power grid topology snapshot system based on power flow in the embodiment of the present invention can be used for the power grid topology snapshot method based on power flow, and the steps of implementing the method and bringing corresponding beneficial effects are not described in detail here.

[0056] Embodiment 3:

[0057] See also Figure 6 An embodiment of the present invention also provides a power grid topology snapshot device based on power flow, including: a front-end sampling module and a data analysis background arranged in the power grid, the front-end sampling module includes multiple channels and multiple groups of voltage sampling units and current sampling units, and the data analysis background includes a sampling analysis unit, a Beidou satellite timing unit and a 5G communication unit.

[0058] The power grid topology snapshot device based on the flow has multiple voltage and current sampling channels with a sampling rate of not less than 6400Hz. It can collect multiple current and voltage waveforms at the same time, and use the waveforms to calculate the voltage, current, power and electric energy values ​​as well as power quality parameters such as harmonics, waveform distortion, and phase angle. The device is equipped with a 5G communication module, which can achieve a data transmission speed of not less than 200 times / second and a data transmission bandwidth of not less than 10Mb / s, ensuring that the data upload delay is less than 10ms. The device uses Beidou satellite timing, with a timing accuracy of less than 20ms and a satellite loss timing accuracy of no more than 20us, which is used to synchronize the sampling time and ensure the consistency of the sampling time nodes of each device.

[0059] The multiple multi-channel and multi-group voltage sampling units and current sampling units of the front-end sampling module are responsible for collecting relevant data of all power supply and power consumption gateways, and form a complete system with the data analysis background. The background uniformly performs topological analysis on the collected synchronous sampling data, which can improve the accuracy and real-time performance of the existing power grid topology analysis, and solves the problems of rapid changes in power grid topology under the hybrid power supply mode, slow update speed, low accuracy, and poor real-time performance of the original power flow analysis method. It can realize real-time holographic monitoring of wide-area or regional microgrids and continuous real-time and high-precision topological monitoring of the entire chain emissions of hybrid power grids.

[0060] Embodiment 4:

[0061] See also Figure 7, an embodiment of the present invention further provides a computer device, the computer device comprising a memory 4, a processor 5 and a network interface 6 which are interconnected through a data bus. It should be noted that the figure only shows a computer device having components 5-7, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable gate arrays (Field-Programmable Gate Array, FPGA), digital processors (Digital Signal Processor, DSP), embedded devices, etc.

[0062] The computer device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may interact with a user through a keyboard, a mouse, a remote controller, a touch pad, or a voice control device.

[0063] The memory 4 includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory 4 can be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory 4 can also be an external storage device of the computer device, such as a plug-in hard disk equipped on the computer device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Of course, the memory 4 can also include both the internal storage unit of the computer device and its external storage device. In this embodiment, the memory 4 is generally used to store the operating system installed on the computer device, various application software, and a program for storing a power grid topology snapshot method based on power flow, and the memory 4 can also be used to temporarily store various types of data that have been output or are to be output.

[0064] The processor 5 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chips in some embodiments. The processor 5 is generally used to control the overall operation of the computer device. In this embodiment, the processor 5 is used to run the program of the power grid topology snapshot method based on the flow stored in the memory 4. The network interface 6 may include a wireless network interface or a wired network interface, and the network interface 6 is generally used to establish a communication connection between the computer device and other electronic devices.

[0065] A computer program is stored on the readable storage medium, and the readable storage medium stores a program of a power grid topology snapshot method based on power flow. The power grid topology snapshot method program based on power flow can be executed by at least one processor so that the at least one processor executes the program of the power grid topology snapshot method based on power flow to realize the functions of related system modules.

[0066] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the method and system described in the embodiments of the present application.

[0067] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A power grid topology snapshot method based on power flow, characterized in that: The following steps are involved: Obtain the waveform data of current and voltage at each node of the power grid at the same time; Calculating power quality parameters based on waveform data of current and voltage at each node of the power grid, obtaining power flow at each node of the power grid, and vectorizing the topological structure of the power grid; By performing topological analysis on the vectored power grid, the hybrid structure of the power grid is transformed into a multi-root tree structure with clear power supply links, and the topological structure of the power grid at the current moment is obtained; The waveform data of the current and voltage at each node of the power grid are obtained by installing a high-speed, low-latency, bidirectional electric energy metering device and an electric energy quality detection device at the node exit of the power plant of the power grid and the nodes of each substation of the power grid; The electric energy metering device and the electric energy quality detection device perform clock synchronization via GPS satellites or BeiDou satellites; The power quality parameters include the values ​​of voltage, current, power and electric energy as well as harmonics and waveform distortion; The steps of calculating the power quality parameters based on the waveform data of the current and voltage at each node of the power grid, obtaining the power flow at each node of the power grid, and vectorizing the power grid topology structure specifically include: Based on the power quality parameters, determine the power generation status of each independent power supply source of the power grid at the current moment, the sources of different power supply lines at the entrances of each level of power distribution units, and the on / off status of each power-consuming device; Solidify the composition ratio and power flow direction of the power grid at the current moment, make the power generation and consumption of each point in the power grid clear, and determine the directionality of electric energy, so as to vectorize the topology of the power grid.

2. A power grid topology snapshot method based on power flow as claimed in claim 1, characterized in that: The step of converting the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid specifically includes: In the vectored power grid topology, after eliminating the non-generating power supply sources, non-power-consuming equipment, and unused distribution units, the ring network type hybrid complex power grid structure is decomposed and simplified into a multi-root tree structure with clear links.

3. A power grid topology snapshot system based on power flow, characterized in that: The power grid topology snapshot system based on power flow is used to implement the steps of the power grid topology snapshot method based on power flow according to any one of claims 1-2; Also includes: An acquisition module is used to acquire waveform data of current and voltage at each node of the power grid at the same time; A calculation and vectorization module, used to calculate power quality parameters based on the waveform data of current and voltage at each node of the power grid, obtain the power flow at each node of the power grid, and vectorize the topology of the power grid; The conversion module is used to convert the hybrid structure of the power grid into a multi-root tree structure with clear power supply links by performing topological analysis on the vectored power grid, so as to obtain the topological structure of the power grid at the current moment.

4. A power grid topology snapshot device based on power flow, characterized in that: The power grid topology snapshot device based on power flow is used to implement the steps of the power grid topology snapshot method based on power flow according to any one of claims 1-2; It also includes: a front-end sampling module and a data analysis background arranged in the power grid, the front-end sampling module includes multiple channels and multiple groups of voltage sampling units and current sampling units, and the data analysis background includes a sampling analysis unit, a Beidou satellite timing unit and a 5G communication unit.

5. A computer device, characterized in that: comprising at least one processor, at least one memory and a data bus; Wherein: the processor and the memory communicate with each other through the data bus; the memory stores a program executed by the processor to implement the power grid topology snapshot method based on power flow as described in any one of claims 1-2.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by a processor, the steps of the power grid topology snapshot method based on power flow are implemented as described in any one of claims 1-2.

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