CN111934902A - A data modeling method for two-way interactive business communication between power grid and users - Google Patents

Abstract

The invention discloses a data modeling method for two-way interactive business communication between a power grid and a user. In order to overcome the problems of multiple data collection methods, scattered locations, huge amount of data, and difficulty in information sharing in the prior art for diversified two-way interactive services; the present invention includes the following steps: S1: analyze the needs of power service users and their communication data needs; Analyze the obtained requirements, and build a network structure of a two-way interactive business communication system with a hierarchical information structure according to the communication standard; S3: According to the communication standard, the data model is constructed and the data model is expanded. The invention conducts modeling and expansion according to the IEC61850 standard according to the power business user requirements obtained by analysis, has strong expansibility, strong scene adaptability, and meets the two-way interaction requirements of the power grid and various power user services.

Description

A data modeling method for two-way interactive business communication between power grid and users

technical field

The invention relates to the field of electric power technology, and in particular, to a data modeling method for two-way interactive business communication between a power grid and a user.

Background technique

my country's "smart grid" plan was released by the State Grid Corporation in 2009. In the electricity consumption link of the smart grid, the Internet of Things technology is mainly guided by intelligent electricity consumption and interactive technology, with two-way, high-speed and safe data communication. Supported by the network, it is used in intelligent electricity service, electricity information collection, intelligent key customer service, electric vehicle charging and replacement, intelligent business hall, demand-side management and energy efficiency assessment, green computer room environment management and power environment monitoring, etc. To achieve flexible access to the power grid, plug and play and two-way interaction with customers, improve power supply reliability and power efficiency, improve the service level of power supply enterprises, and provide technical support for the national energy conservation and emission reduction strategy.

For example, a "power grid terminal communication system" disclosed in Chinese patent documents, its bulletin number CN104505938B, includes a power consumption terminal, an information acquisition module, a local centralized processor, a GPRS module and a remote monitoring center connected in sequence, so The information collection module collects the data information of the electricity terminal, and gathers the data information of the electricity terminal into the local centralized processor, establishes a connection with the GPRS network through the GPRS module, and transmits the data information. to the remote monitoring center; the remote monitoring center analyzes and processes the data information transmitted by the electric terminal, and then sends a control instruction back to the corresponding electric terminal.

However, in the application of the Internet of Things in the smart grid, there is less monitoring data, and there is no comprehensive perception of the device and system status and environment; the sensor is standardized, and the level of practicality needs to be improved; the communication methods and protocols of the existing application systems are not unified, and it is difficult to achieve Standardized collection and transmission of data; insufficient support for two-way interactive services such as distributed power grid integration, electric vehicle operation, and mobile marketing.

SUMMARY OF THE INVENTION

The invention mainly solves the problems of multiple data collection methods, scattered locations, huge data volume and difficulty in information sharing in the prior art for diversified two-way interactive services; and provides a data modeling method for two-way interactive business communication between power grids and users, which needs to be based on the Internet of Things. The integration of key technologies such as the overall architecture of technical data collection and control, the data collection control strategy and communication protocol for two-way interactive services based on the Internet of Things, two-way service data modeling and data interaction methods, promote the integration of two-way interactive service data collection and interaction.

The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

The present invention includes the following steps:

S1: Analyze the needs of power service users and their communication data needs;

S2: Based on the requirements obtained from the analysis, build a network structure of a two-way interactive business communication system with a hierarchical information structure according to communication standards;

S3: The data model is constructed and the data model is extended according to the communication standard.

According to the demand obtained from the analysis, this scheme specifies the required data according to the communication standard, and defines it as different "node data" according to different types. The data processing is more organized and the required data is also compared. It can solve the problems of multiple data collection methods, scattered locations, huge data volume, and difficulty in information sharing for diversified two-way interactive services, and promote the integration of data collection and interaction for two-way interactive services.

Preferably, the power service user requirements include the functional requirements of major customer services, residential user services, mobile operation services, electric vehicle services, and distributed power generation/energy storage services.

It analyzes each business unit included in the power business user requirements, and the model established according to the communication standard can adapt to a variety of power business, with strong adaptability and versatility.

Preferably, the network structure of the communication system includes a station control layer, a bay layer and a process layer;

The process layer includes several terminal data acquisition devices, and the process layer completes the acquisition of analog quantities, the input/output of switch quantities, and the sending of operation control commands;

The interval layer includes a terminal acquisition and measurement fusion module and a data interaction module;

The station control layer includes a control center, the station control layer completes the management and control of the equipment at the bay layer, and the station control layer communicates with the service support platform through the power data network.

According to the communication standard, the network structure of the two-way interactive business communication system with the information sub-layered structure is established on the basis of the business analysis.

Preferably, data exchange is performed inside the compartment layer, and data exchange is directly performed between compartment layers; The upload and delivery of interactive data is completed between the control layers. The communication network mechanism conducts data communication between layers and within layers through communication standards, and establishes a complete two-way interactive communication network structure.

Preferably, the step S3 includes the following steps:

S31: Find the basic function modules that satisfy the online monitoring according to the logical nodes of the function model listed in the communication standard;

S32: According to the logical node extension specification of the communication standard, the functional model logical nodes not listed in the communication standard are extended according to the communication specification;

S33: According to the logical nodes of the basic function model, the logical nodes of the extended function model, and the data objects, and according to the naming rules of the communication standard, establish a two-way interactive business communication data model between the power grid and the user.

This solution expands the logical nodes according to the demand, and has strong expansibility.

Preferably, the basic functional model mainly includes at least one physical logical node LPHD, one logical node zero LLN0 and one or more specific application logical nodes. Establish a complete communication model to solve the problem of insufficient support of the State Grid for two-way interactive services for users.

Preferably, the extended function model includes, on the basis of the logic node of the basic function model, complete measurement and control/alarm logic node data, metering logic node data and protection logic node data. According to the communication rules, it can be expanded according to the actual needs, with a wide range of applications and strong scalability.

Preferably, the communication standard is IEC61850. The IEC61850 standard has a strong expansion capability.

The beneficial effects of the present invention are:

1. Modeling according to IEC61850 communication standard, and data expansion according to template stipulation, it has strong expansion ability.

2. Build a network structure of a two-way interactive business communication system with a hierarchical information structure, establish a complete data model, and solve the problem of insufficient support for users' two-way interactive services from the power grid.

3. The required data is specified according to the communication standard, and is defined as different "node data" according to different types. The data processing is more organized, and the required data is also clearer, which can solve the problem of diversification. Two-way interactive service data collection methods, scattered locations, huge amount of data, and difficulty in information sharing, etc., promote the integration capability of two-way interactive service data collection and interaction.

Description of drawings

FIG. 1 is a flow chart of the modeling method of the present invention.

FIG. 2 is a structural diagram of the two-way interactive service communication information network of the present invention.

FIG. 3 is a data and type structure diagram of the MMXU of the present invention.

FIG. 4 is a data and type structure diagram of the GGIO of the present invention.

FIG. 5 is a data and type structure diagram of the MMTR of the present invention.

FIG. 6 is a data and type structure diagram of the PTOC of the present invention.

In the figure, 1. Station control layer, 11. Platform host, 12. Operation platform, 2. Interval layer, 21. Acquisition and measurement fusion module, 22. Data interaction module, 3. Process layer, 31. Process interface, 32. Sensor, 33. Actuator.

Detailed ways

The technical solutions of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

Example:

A method for modeling data for two-way interactive business communication between power grids and users in this embodiment. This embodiment takes the two-way interactive business of electric vehicle charging as an example, as shown in FIG. 1 , and includes the following steps:

S1: Analyze power service user requirements and communication data requirements.

The two-way interactive business of electric vehicle charging can be mainly divided into five sub-modules: electric energy metering and billing, charging equipment status, asset management, event recording and charging control.

The electric energy billing module includes parameters such as voltage, current, electric energy, and electricity fee; the charging equipment status module includes charging progress, temperature, humidity, connection status and other parameters according to the actual charging demand; the asset management module mainly includes the asset statistical management of charging equipment; event records The module includes event reporting and recording of the electricity log of the electric vehicle charging station; the charging control module includes the charging status and protection control.

S2: Build a network structure of a two-way interactive business communication system with a hierarchical information structure.

The two-way interactive business of electric vehicle charging is abstracted into an IEC61850 model. On the basis of analyzing the power business, according to the IEC61850 standard, a data model including a hierarchical structure of information is built. As shown in Figure 2, the two-way interactive business communication system is divided into three layers from the logical and physical concepts, namely the station control layer 1, the bay layer 2 and the process layer 3. The IEC61850 standard defines the communication interface between layers.

The station control layer 1 includes the platform host 11, the operation platform 12, etc., forming the monitoring and management center of the interactive system. The station control layer 1 realizes the management and control of the equipment in the bay layer 2, and communicates with the business support platform such as the dispatch center or the disease control center through the power data network.

The interval layer 2 includes a terminal acquisition and measurement fusion module 21 and a data interaction module 22 . The bay layer 2 device summarizes the real-time data information of the bay layer 2, transmits it to the station control layer 1 through the network, and simultaneously receives the control operation commands issued by the station control layer 1, so as to realize the link transmission function of the operation command.

Real-time data exchange is performed between the interior of the bay layer 2 and the bay layer 2. The bay layer 2 exchanges the collected measurement values with the process layer 3 through the measurement fusion module 21, and the bay layer 2 communicates with the process layer 3 and the station control through the data interaction module 2 respectively. The upload and delivery of interactive data is completed between layers 1. The bay layer 2 exchanges communication data with the remote control.

The process layer 3 includes various service terminal data collection devices, including a process interface 31 , a sensor 32 and an actuator 33 . Process layer 3 mainly completes equipment-related functions such as analog quantity acquisition, switch quantity input/output, and operation control command sending.

S3: The data model is constructed and the data model is extended according to the communication standard.

The communication standard adopted in this embodiment is the IEC61850 standard. The core of the IEC61850 standard is the information model and the modeling method. The IEC61850 standard abstracts the actual physical devices, and the communication between the devices becomes the information flow between the information models.

S31: Search for basic functional modules that satisfy the online monitoring according to the logical nodes of the functional model listed in the communication standard. The basic functional model mainly includes at least one physical logical node LPHD, one logical node zero LLN0 and one or more specific application logical nodes.

S32: According to the logical node extension specification of the communication standard, the functional model logical nodes not listed in the communication standard are extended according to the communication specification. The extended function model includes improving the measurement and control/alarm logic node data, metering logic node data and protection logic node data on the basis of the logic node of the basic function model.

S33: According to the logical nodes of the basic function model, the logical nodes of the extended function model, and the data objects, and according to the naming rules of the communication standard, establish a two-way interactive business communication data model between the power grid and the user.

The monitoring function of the charging station is logically divided into three LD modules, the LD modules include LD1, LD2 and LD3. LD1 completes the measurement, control and alarm functions; LD2 completes the measurement function; LD3 completes the protection function. Each LD block contains physical logical node LPHD and logical node zero LLN0. LPHD represents public information of physical devices; LLN0 represents public information of logical devices.

LD1 contains the measurement MMUX and general process I/O GGIO logical nodes. MMXU implements measurement and monitoring functions to monitor the AC current and voltage of charging stations; GGIO implements state monitoring, alarm and control functions.

LD2 contains the metering MMTR logical node. MMTR realizes energy metering.

LD3 includes time-limited overcurrent PTOC and time-limited overvoltage PTOV logic nodes, PTOC and PTOV respectively implement overcurrent and overvoltage protection for charging stations.

The MMTR obtains the output electric energy by obtaining the RMS current and voltage collected by the MMXU logic node and calculating it. PTOC and PTOV obtain the current and voltage values of MMXU, and judge according to the set value of protection action. When overcurrent or overvoltage occurs, GGIO controls the charging station to stop charging.

The measurement MMXU data composition and related types are shown in Figure 3. The MMXU contains the data Phv and A, Phv describes the output phase voltage of the AC charging station; A describes the output phase current.

The attribute type of PhV and A is the relative ground correlation measurement value WYE of the three-phase system, and WYE includes phsA, phsB, phsC whose attribute type is the complex measurement value CMV. It is further determined that the data attributes included in the CMV include the measurement value cVal, the quality attribute q and the time stamp t. In addition, each LN also contains descriptive data such as mode, performance, health, and nameplate inherited from the common LN class.

The GGIO defined in the IEC61850 standard includes the integer state input IntIn describing the state information, the data Alm describing the alarm, and the dual-point controllable state output DPCSO describing the control. The data of GGIO is extended to describe the status, alarm and control information of charging piles.

As shown in Figure 4, the extended definitions IntIn1, IntIn2, and IntIn3 in GGIO describe the charging status of the charging pile, the terminal has power status, and maintain the door switch status information. The attribute type is an integer state INS, and its data attribute stVal specifically represents various corresponding state values.

Also expand the data of alarm information and control information. The attribute type of the alarm data Alm is the single-point state public data type SPS, and the maintenance door opening alarm, closing alarm, charging start alarm, charging end alarm, and device failure alarm information are specifically represented by the data attribute stVal.

The control data DPCSO attribute type is DPC, which supports conventional security pre-operational selection control or conventional security direct control. The control operation is completed through the cooperation of data attributes such as control mode ctlModel, SBO class sboclass, and timeout time sboTimeOut. The charging pile starts charging and ends charging using the normal safety pre-operation selection control, and emergency stop uses the normal safety direct control.

The metering MMTR in the metering logical node data contains the data net active energy TotWh. The data attribute actVal of TotWh describes the output electric energy of the charging pile. The data composition and related types of MMTR are shown in Figure 5.

The data of the protection function logical nodes PTOV and PTOC include start Str, action Op, start value StrVal and protection action time RltTmms (RelativeTime).

The attribute type of Str is ACD, the data attribute includes total action and three-phase protection settings; the attribute type of Op is ACT, and the data attribute includes total action and three-phase protection action; StrVal is the action start value; RltTmms describes the action delay time; The data composition and related types are shown in Figure 6.

The method is not limited to the two-way interaction of the electric vehicle business, which is a power system business, and other related or emerging power system business users also have similar technical effects when interacting with the power grid.

Claims (8)

1. a two-way interactive business communication data modeling method between power grid and user, is characterized in that, comprises the following steps: S1: Analyze the needs of power service users and their communication data needs; S2: Based on the requirements obtained from the analysis, build a network structure of a two-way interactive business communication system with a hierarchical information structure according to communication standards; S3: The data model is constructed and the data model is extended according to the communication standard. 2. The data modeling method for two-way interactive business communication between a power grid and a user according to claim 1, wherein the user requirements for the power business include major customer business, residential user business, mobile operation business, and electric vehicle business. and the functional requirements of distributed generation/storage business. 3 . The data modeling method for two-way interactive business communication between power grids and users according to claim 1 or 2, wherein the network structure of the communication system comprises a station control layer (1), an interval layer (2) and Process layer (3); The process layer (3) includes several terminal data acquisition devices, and the process layer completes the acquisition of analog quantities, the input/output of switch quantities, and the sending of operation control commands; The interval layer (2) includes a terminal acquisition and measurement fusion module (21) and a data interaction module (22); The station control layer (1) includes a monitoring and management center, the station control layer (1) completes the management and control of the equipment in the bay layer (2), and the station control layer () communicates with the service support platform through a power data network. 4. A data modeling method for two-way interactive business communication between power grids and users according to claim 3, characterized in that, data exchange is performed inside the compartment layer (2), and data is directly performed between the compartment layers (2). Exchange; the interval layer (2) exchanges the collected measurement values with the measurement fusion module (21) and the process layer (3), and the interval layer (2) communicates with the process layer (3) and the station control layer respectively through the data interaction module (22). (1) Complete the upload and release of interactive data between them. 5. The data modeling method for two-way interactive business communication between a power grid and a user according to claim 1, wherein the step S3 comprises the following steps: S31: Find the basic function modules that satisfy the online monitoring according to the logical nodes of the function model listed in the communication standard; S32: According to the logical node extension specification of the communication standard, the functional model logical nodes not listed in the communication standard are extended according to the communication specification; S33: According to the logical nodes of the basic function model, the logical nodes of the extended function model, and the data objects, and according to the naming rules of the communication standard, establish a two-way interactive business communication data model between the power grid and the user. 6. a kind of power grid and user two-way interactive business communication data modeling method according to claim 5, is characterized in that, described basic function model mainly comprises should comprise at least one physical logical node LPHD, one logical node zero LLN0 and One or more application-specific logical nodes. 7. A kind of power grid and user two-way interactive business communication data modeling method according to claim 5 or 6, it is characterized in that, described extended function model is included on the basis of basic function model logic node, perfect measurement and control /Alarm LN data, meter LN data, and protect LN data. 8 . The data modeling method for two-way interactive business communication between a power grid and a user according to claim 1 or 5 , wherein the communication standard is IEC61850. 9 .

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