CN216486499U

CN216486499U - Cloud processing system for generalized short-circuit ratio of multi-direct-current access receiving-end power grid

Info

Publication number: CN216486499U
Application number: CN202121230563.1U
Authority: CN
Inventors: 李锋; 金维刚; 周良松
Original assignee: Huazhong University of Science and Technology; Central China Grid Co Ltd
Current assignee: Huazhong University of Science and Technology; Central China Grid Co Ltd
Priority date: 2021-06-02
Filing date: 2021-06-02
Publication date: 2022-05-10
Anticipated expiration: 2031-06-02

Abstract

The utility model discloses a cloud processing system for a generalized short-circuit ratio of a multi-direct-current access receiving-end power grid, and relates to the technical field of power transmission. The node A, B, C data acquisition module is used for acquiring voltage and current data, the receiving module receives the voltage and current data, the sorting module is used for sorting and calculating a generalized short-circuit ratio, the storage module is used for storing data resources, and the client center module is used for controlling a shared cloud storage system to share the data resources and store the cloud data resources. The cloud processing system for the generalized short-circuit ratio of the multi-DC access receiving-end power grid is capable of accurately calculating the generalized short-circuit ratio of the receiving-end power grid in real time, and measuring the stability of the multi-DC access receiving-end power grid according to the index of the generalized short-circuit ratio.

Description

Cloud processing system for generalized short-circuit ratio of multi-direct-current access receiving-end power grid

Technical Field

The utility model belongs to the technical field of power transmission, and particularly relates to a cloud processing system for a generalized short-circuit ratio of a multi-direct-current access receiving-end power grid.

Background

The admission of a large amount of renewable energy sources such as wind power, photovoltaic and the like in a power system brings a brand-new opportunity for the optimization of an energy structure and the relief of an environmental problem, but also provides a serious challenge for the operation and control of a power grid, renewable energy power generation such as wind power generation and photovoltaic power generation generally has strong randomness, intermittency and fluctuation, large-scale access can bring the overall safety problem of the power grid, cloud is a network in essence, cloud computing is a network for providing resources in narrow sense, a user can acquire the resources on the cloud at any time, the resources can be used according to the demand and can be regarded as infinitely expanded, only the payment is made according to the usage amount, the cloud computing is a service related to information technology, software and the internet in broad sense, the computing resource sharing pool is called as cloud, and the cloud computing integrates a plurality of computing resources, the method has the advantages that automatic management is realized through software, a desired result can be calculated only by the participation of few people, the core concept of cloud computing is that the internet is used as the center, fast and safe cloud computing service and data storage are provided on a website, the cloud storage is a new concept which is extended and developed on the cloud computing concept, is an emerging network storage technology, and is a system which integrates a large number of storage devices of different types in a network through application software to cooperatively work through functions such as cluster application, network technology or a distributed file system and provides data storage and service access functions to the outside;

the generalized short-circuit ratio is an index for describing the relative strength and stability of a power electronic multi-access receiving-end power grid, so that the receiving-end power grid can be monitored by using the index, the generalized short-circuit ratio index is related to the interference stability of a multi-direct-current access receiving-end power grid system, and is essentially popularized and applied in the multi-direct-current access receiving-end power grid system by using the traditional short-circuit ratio, specifically, the generalized short-circuit ratio of the multi-direct-current access receiving-end power grid system can accurately describe the relative strength of the receiving-end power grid system from the angle of interference stability, represent the system stability margin, can be applied to the interference stability evaluation of the multi-direct-current access receiving-end power grid system, provide a theoretical basis for the flexible grid connection of a large-scale renewable energy power station and a high-permeability renewable energy power generation cluster, and is only related to the capacity of a multi-port admittance matrix and accessed power electronic equipment of an alternating-current network, therefore, the method has the advantages of simple calculation process and convenience for engineering application, and in addition, the sensitivity of the generalized short-circuit ratio index of the multi-direct-current access receiving-end power grid system is closely related to the weak point of the system, so that theoretical support can be provided for the problems of new energy source units, site selection and capacity determination of bases, power grid planning, operation scheduling, design of oscillation suppression controllers and the like;

at present, direct current line engineering in China mainly takes charge of stably transmitting new energy electric power in northwest to east, extra-high voltage direct current transmission engineering brings huge benefits, and meanwhile complexity of power grid operation is increased, so that influence factors of index generalized short-circuit ratio strength on an electric power system when multiple direct currents flow into a receiving-end power grid need to be deeply analyzed and evaluated; therefore, a cloud processing system facing the generalized short-circuit ratio of a multi-direct-current access receiving-end power grid is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cloud processing system for generalized short-circuit ratio of a multi-direct-current access receiving-end power grid, which can accurately calculate the generalized short-circuit ratio of the receiving-end power grid in real time and measure the stability of the multi-direct-current access receiving-end power grid according to the generalized short-circuit ratio index.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model relates to a cloud processing system facing a multi-direct-current access receiving-end power grid generalized short-circuit ratio, which comprises a node A, B, C data acquisition module, a sorting module, a receiving module, a storage module, a client center module and a safety center module, wherein the node A, B, C data acquisition module is used for acquiring voltage and current data, the receiving module is used for receiving the voltage and current data, the sorting module is used for sorting and calculating the generalized short-circuit ratio, the storage module is used for storing data resources, the client center module is used for controlling a shared cloud storage system to share the data resources and store the cloud data resources, and the safety center module is used for encrypting and decrypting data stored in a local storage module and comprehensively protecting the safety of the cloud computing and cloud storage system.

Preferably, the node A, B, C data acquisition module is used to obtain continuous point-in-time data of voltage and current of the access port node A, B, C.

Preferably, the receiving module is used for receiving voltage and current data. The receiver receives the signal, converts it into information in the same physical form as that of the signal, and processes it by the microprocessor 1 to obtain complete data.

Preferably, the sorting and calculating module comprises a microprocessor 2 and a microprocessor 3, and is used for sorting, analyzing and calculating the voltage and current information collected by the node A, B, C data collecting module through the microprocessor 2 and the microprocessor 3 to obtain the generalized short-circuit ratio.

Preferably, the storage module is divided into a cloud storage unit and an offline storage unit.

Preferably, the client center module is a mobile client, a PC or an intelligent terminal, and is a client center for controlling the shared cloud storage system to realize sharing data resources and storing cloud data resources.

Preferably, the security center module is used for encrypting and decrypting data stored in the local storage module, so as to comprehensively protect the security of the cloud computing and cloud storage system, and the device comprises login security and private information security, and if the security behavior is abnormal, an abnormal alarm can be triggered immediately.

The utility model has the following beneficial effects:

the utility model relates to a cloud processing system facing to a generalized short-circuit ratio of a multi-direct-current access receiving-end power grid, a client center module of the system is connected with a cloud storage unit and an offline storage unit and provides service for a user, when the user sends a metadata request through the client center module, the storage module receives the metadata request and makes a corresponding response to realize the connection of the client center module and the storage module, and when the data of the storage module can meet the metadata request, the corresponding data can be transmitted back to the client center module, the rapidity of data synchronization of the user is improved by establishing a three-stage structure of the client center module, the cloud storage unit and the offline storage unit, under the condition of no network or low transmission efficiency, the data is firstly stored in a local storage device, when the local storage device establishes network connection with the cloud storage device, data is synchronized to a cloud storage.

The cloud processing system facing the generalized short-circuit ratio of the multi-direct-current access receiving-end power grid can realize the online real-time measurement of the generalized short-circuit ratio by utilizing the cloud computing and cloud storage system to calculate the generalized short-circuit ratio of the voltage and current data collected by the node A at the access port, has a good judgment index for judging the stability of the multi-direct-current access receiving-end power grid, and has the advantages of simple computing process and convenience in engineering application because the generalized short-circuit ratio is related to a multi-port admittance matrix of a direct-current network and the capacity of accessed power electronic equipment.

Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an overall structure of a cloud processing system facing a generalized short-circuit ratio of a multi-dc access receiving-end power grid according to the present invention;

fig. 2 is a model example diagram of a cloud processing system oriented to a generalized short-circuit ratio of a multi-dc-access receiving-end power grid according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, the utility model relates to a cloud processing system facing a multiple-dc access receiving-end power grid generalized short-circuit ratio, which comprises a node A, B, C data acquisition module, a sorting module, a receiving module, a storage module, a client center module and a security center module, wherein the node A, B, C data acquisition module is used for acquiring voltage and current data, the receiving module is used for receiving the voltage and current data, the sorting module is used for sorting and calculating the generalized short-circuit ratio, the storage module is used for storing data resources, the client center module is used for controlling a shared cloud storage system to share the data resources and store the cloud data resources, and the security center module is used for encrypting and decrypting data stored in a local storage module and comprehensively protecting the security of the cloud computing and cloud storage system.

The node A, B, C data acquisition module is used for acquiring continuous time point data of voltage and current of the access port node A, B, C, the current transformer and the voltage transformer have the advantages of high precision, excellent error performance, remarkable economy and the like, the voltage transformer can convert high voltage into standard secondary voltage of 100V or lower grade according to a proportional relation so as to be used for measuring the voltage of a line, and the current transformer can convert primary current with a larger value into secondary current with a smaller value through a certain transformation ratio so as to be used for measuring the current of the line. A voltmeter to measure voltage; and an ammeter for measuring the voltage.

The receiving module is used for receiving voltage and current data. The receiver receives the signal, converts it into information in the same physical form as that of the signal, and processes it by the microprocessor 1 to obtain complete data.

The sorting and calculating module comprises a microprocessor 2 and a microprocessor 3 and is used for sorting, analyzing and calculating the voltage and current information collected by the node A, B, C data collecting module through the microprocessor 2 and the microprocessor 3 to obtain the generalized short-circuit ratio.

The storage module is divided into a cloud storage unit and an offline storage unit, the cloud storage unit adopts an SPI storage unit, the offline storage unit adopts a Nand Flash storage unit, and the Nand Flash storage unit has the advantages of large capacity, high rewriting speed and the like and is suitable for storing a large amount of data; the cloud storage unit is connected with the client center module, and a user accesses the cloud storage device through the client center module and manages cloud data; and the offline storage unit is connected to the client center module and used for storing and managing the local data.

The client center module is a mobile client, a PC (personal computer) or an intelligent terminal, is a client center for controlling the shared cloud storage system to realize sharing data resources and storing the cloud data resources, and is used for connecting the cloud storage unit and the offline storage unit and providing services for users. When a user sends a metadata request through the client center module, the storage module receives the metadata request and makes a corresponding response, so that the connection between the client center module and the storage module is realized, and when the data of the storage module can meet the metadata request, the corresponding data can be transmitted back to the client center module by the responded data.

The device comprises a security center module, a local storage module, a cloud computing and cloud storage system and a security alarm module, wherein the security center module is used for encrypting and decrypting data stored in the local storage module, and the security of the cloud computing and cloud storage system is comprehensively protected.

In the scheme, a plurality of computing resources are aggregated by cloud computing, automatic management is realized through software, a desired result can be calculated only by participation of few people, and the core concept of the cloud computing is to provide rapid and safe cloud computing service and data storage on a website by taking the internet as a center; cloud storage is a new concept extended and developed on the cloud computing concept, is an emerging network storage technology, and refers to a system which integrates a large number of various storage devices of different types in a network through application software to cooperatively work through functions such as cluster application, network technology or distributed file system and the like, and provides data storage and service access functions to the outside; the generalized short-circuit ratio is an index which characterizes the relative strength and stability of the power electronic multi-access receiving-end power grid, and the generalized short-circuit ratio data of the multi-direct-current access receiving-end power grid are tracked and monitored in real time, so that the stability of the multi-direct-current access receiving-end power grid can be judged according to the generalized short-circuit ratio index, and the generalized short-circuit ratio is related to a multi-port admittance matrix of a direct-current network and the capacity of accessed power electronic equipment, so that the generalized short-circuit ratio has the advantages of simple calculation process and convenience for engineering application;

example two:

as shown in fig. 2, a model is established, a plurality of direct current access receiving end power grid system nodes are divided into an access port node a, a network computing node B and an infinite power grid equivalent node C, a plurality of direct current sources access the access port node a of the receiving end power grid, continuous time point data of voltage and current of the access port node a are acquired and obtained and transmitted to a cloud computing and cloud storage system, cloud computing and cloud storage of a generalized short-circuit ratio are carried out, a voltage difference matrix and a current difference matrix are further obtained through cloud computing, a rearranged Jacobi matrix establishes a voltage and current relation model, a rearranged matrix is solved according to a Jacobi matrix iterative solution, and the generalized short-circuit ratio is obtained by using the rearranged matrix;

according to a threshold value of the generalized short-circuit ratio, judging whether a multi-direct-current access receiving-end power grid is stable or unstable;

the multi-direct-current access receiving-end power grid system nodes are divided into an access port node A, a network computing node B and an infinite power grid equivalent node C, the access port node A is a connection node of the multi-direct-current access receiving-end power grid system, the infinite power grid equivalent node B is an alternating-current network equivalent node, the infinite power grid equivalent node is regarded as a grounding node in the field of small interference stability analysis, the alternating-current network equivalent node is a grounding node after direct current networks in the multi-direct-current access receiving-end power grid system are subjected to equivalence, and the network computing node is a node which is not directly connected with power generation equipment except the access port node A and the infinite power grid equivalent node B.

The scheme provides a cloud processing system facing a generalized short-circuit ratio of a multi-direct-current access receiving-end power grid, the system is high in compatibility, and various cloud terminals can be supported; the sorting and calculating module adopts a plurality of processors to work coordinately and is connected with the data acquisition module, the receiving module and the storage module through different interfaces, so that the fault tolerance is strong; the system is connected with a cloud storage server and can be connected with client center modules arranged on each power grid subsystem, so that the transmission efficiency is high and the transmission speed is high; the system can acquire the operation data of a receiving-end power grid with multiple direct current accesses in real time, the related data of the local generalized short-circuit ratio of the power grid are processed in a wide-range parallel mode, and the interaction degree between the alternating current system and the direct current system can be evaluated by measuring the supporting capacity of the alternating current system to the direct current system through the calculation result; the storage module is divided into a cloud storage unit and an offline storage unit, so that data loss caused by data calling or updating is guaranteed; the client center module is divided into a mobile client, a PC (personal computer) or an intelligent terminal, and is conveniently used for controlling the shared cloud storage system to realize sharing data resources and storing cloud data resources; the client center module is used for connecting the cloud storage unit and the offline storage unit and providing service for users.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a cloud processing system towards many direct current access receiving end electric wire netting generalized short circuit ratio which characterized in that: including node A, B, C data acquisition module, arrangement module, receiving module, storage module, customer end center module and security center module, node A, B, C data acquisition module is used for gathering voltage and current data, receiving module receives voltage and current data, the arrangement module is used for arranging calculation generalized short-circuit ratio, storage module is used for the storage data resource, customer end center module is used for controlling sharing cloud storage system and realizes sharing data resource and storage cloud data resource, security center module is used for encrypting and deciphering and overall protection cloud computing and cloud storage system security the data of saving in local storage module.

2. The cloud processing system for multiple direct current access receiving end grid generalized short circuit ratio of claim 1, wherein the node A, B, C data collection module is configured to obtain continuous time point data of voltage and current of the access port node A, B, C.

3. The cloud processing system facing the generalized short-circuit ratio of the multi-direct-current-access receiving-end power grid according to claim 1, wherein the receiving module is used for receiving voltage and current data, the receiver mainly receives the signals, converts the signals into information in the same physical form as that of the signals during transmission, and processes the information through the microprocessor 1 to obtain complete data.

4. The cloud processing system oriented to the generalized short-circuit ratio of the multi-direct-current-access receiving-end power grid according to claim 1, wherein the sorting and calculating module comprises a microprocessor 2 and a microprocessor 3, and is used for sorting, analyzing and calculating the voltage and current information acquired by the node A, B, C data acquisition module through the microprocessor 2 and the microprocessor 3 to obtain the generalized short-circuit ratio.

5. The cloud processing system for the generalized short-circuit ratio of the multi-direct-current-access receiving-end power grid according to claim 1, wherein the storage module is divided into a cloud storage unit and an offline storage unit.

6. The cloud processing system oriented to the generalized short-circuit ratio of the multi-direct-current-access receiving-end power grid according to claim 1, wherein the client center module is a mobile client, a PC or an intelligent terminal, and is a client center for controlling a shared cloud storage system to share data resources and store the cloud data resources.

7. The cloud processing system oriented to the generalized short-circuit ratio of the multi-direct-current-access receiving-end power grid as claimed in claim 1, wherein the security center module is used for encrypting and decrypting data stored in the local storage module, and a device for comprehensively protecting the security of the cloud computing and cloud storage system comprises login security and private information security, and if a security behavior is abnormal, an abnormal alarm can be triggered immediately.