Integrated monitoring platform for substation auxiliary control system

As one of the systems in intelligent substation projects, the comprehensive monitoring platform for substation auxiliary control system usually consists of video surveillance subsystem, access control subsystem, environmental monitoring subsystem, security guard subsystem, intelligent control subsystem, etc. The intelligent substation auxiliary system, with "intelligent control" as its core, monitors and intelligently controls the status of the main electrical equipment, key equipment installation locations, and surrounding environment of the entire station around the clock.

1General Introduction

1.1 Overview

The comprehensive monitoring platform for substation auxiliary control system (intelligent substation auxiliary control system) is an integrated, digital, and intelligent security management platform that integrates online monitoring, video surveillance, visual intercom, power environment, security guards, access control, equipment control, fire alarm, and other subsystems. It achieves unified management and interconnection of multiple subsystems under one platform, truly realizing "integrated and intelligent" management and greatly improving the operational efficiency of the entire system.

The comprehensive monitoring platform for substation auxiliary control system is an independently developed integrated multi system networking platform based on SOA system architecture. It adopts advanced software and hardware development technology to solve problems such as centralized system management, multi-level networking, information sharing, interconnection, and multi business integration.

The comprehensive monitoring platform for substation auxiliary control system is mainly aimed at the power and energy industry. Through technical means such as resource abstraction and unified access, it realizes the integrated display of multiple business systems, greatly reducing the difficulty and workload of daily operation and maintenance, improving the efficiency of system operation and management, and providing intuitive and effective technical support for safety production.

1.2 Substation auxiliary control system platform softwaretechnical standard

The design functions and performance indicators of this software meet the requirements of relevant industry standards and specifications (including but not limited to):

GB/T28181-2011 "Technical Requirements for Information Transmission, Exchange, and Control of Security and Prevention Video Surveillance Networking Systems"

◆State Grid Corporation of China Enterprise Standard (Q/GDW 517.1-2010) "Power Grid Video Surveillance System and Interface"

◆DL/T860-2016 "Power Automation Communication Network and System"

◆DL/T634.5104-2009 "Remote Control Equipment and Systems"

◆IETF RFC 2068, Hypertext Transfer Protocol (HTTP)

◆IETF RFC 2326, Real Time Streaming Protocol (RTSP)

◆IETF RFC 3261 Conference Initialization Protocol (SIP)

◆IETF RFC 3550 Real time Transport Protocol (RTP)

◆IETF RFC 3551 Real time Transmission Control Protocol (RTCP)

◆ITU H.264 "Video and Audio Encoding and Decoding Standard"

◆ITU-T G.711 "Audio Coding and Decoding Standard"

◆ITU-T G.722 "Audio Coding and Decoding Standard"

◆ITU-T G.726 "Audio Coding and Decoding Standard"

IIOverall Design

2.1 Substation auxiliary control system platform softwarebusiness composition

Business Function Composition Diagram

Integrated monitoring platform for substation auxiliary control systemFollowing the SOA concept, adopting modular and plug-in design, business functions are combined as needed, with redundant deployment capabilities to ensure high availability of system business. From a technical structure perspective, it can be mainly divided into the following levels:

1) Basic access layer

Encapsulation of operating systems, databases, secure encryption, device access, and multimedia protocols, shielding differences, compatible with various heterogeneous hardware from multiple vendors, types, and protocols, achieving platform independence for upper layer applications, improving operational efficiency and system compatibility.

2) Platform service layer

In addition to providing authorization authentication, device management, alarm management, data collection, device control, streaming media forwarding services, storage services, linkage services, etc., the platform service layer also provides third-party system access services and platform interconnection management services, supporting platform interconnection and intercommunication.

3) Business layer

By summarizing and encapsulating commonly used businesses, RESTful API interfaces such as video, alarm, device control, data collection, query statistics, and system management are provided for easy access by the presentation layer and third-party systems.

4) Display layer

By calling various service interfaces provided by the business layer through API interfaces, specific functions are presented to end users.

2.2 Platform composition

1) Central management service

As the carrier service of the cloud platform, it is the core component of the entire system and can provide unified authentication, authorization, and management services. As a management server, it centrally configures and manages users, roles, permissions, and video surveillance devices within the system; As an application server, we provide various security monitoring services and offer comprehensive log management and auditing functions.

2) Streaming media services

Support the forwarding and distribution of real-time video data; Support playback and on-demand (VOD) for storing data; Support QoS management and make reasonable use of bandwidth; Support priority management for users and events; Support cascading and distributed deployment; Support statistical information related to video streaming.

3) Storage Services

Supports centralized cloud storage management mode and distributed storage mode for DVR storage; Support PB level massive audio and video data storage, fast retrieval, and intelligent post retrieval; Support flexible backup strategies.

4)alarm functionservice

alarm functionService is one of the core business modules of the platform, which centrally manages video alarms, power environment data alarms, alarm host alarms, access control alarms, fire alarms, and other triggered alarms.

alarm functionThe service can directly receive and process alarm events reported by the device, and can also analyze and confirm the status data collected from the device according to preset rules.

alarm functionAfter receiving a new alarm event, the service is responsible for pushing messages to all subscribed services and users in the system based on the message queue.

5)Device Proxy Service

Adopting a plugin mechanism to connect various devices, receive, transmit, and control various media signaling streams, simplify device access application development, provide standardized and unified interfaces for upper layers, and complete device configuration and control for lower layers.

According to the application scenario, it can be divided into two types: IO device proxy service and streaming media proxy service.

3、 Platform features

1) High reliability

The key services within the platform support deployment and operation in primary backup or multi primary mode, which can effectively prevent system abnormalities caused by hardware or network failures.

The high reliability of internal services on the platform adopts various mechanisms such as state monitoring, forced recovery, and service migration. All services exchange data based on the SOA message bus, and each service regularly reports its own operating status. The central management service is responsible for summarizing and monitoring the service operating status. Once an exception is detected, the abnormal service is immediately handled and other related services are notified to prepare for response. For abnormal services running in standalone mode, the relevant services will automatically resume docking after the restart is completed; For abnormal services running on multiple machines, relevant services choose to actively switch services. If the central management service fails to ensure the overall functioning of the system after multiple restarts of abnormal services, it will proactively restart the server.

All services within the platform have error detection and recovery mechanisms. In the event of service unavailability, database or network failure, the recovery mechanism can be automatically triggered to periodically attempt to restore normal status.

At the same time, the platform has specially designed a software watchdog service, which is responsible for monitoring the running status and handling exceptions of the central management service. The software watchdog service has a single function and is reliable on its own性高To ensure that the platform can achieve telecom grade 7 * 24-hour reliable operation and provide users with reliable services.

2) Good scalability

Adopting modular design, various services in the platform can run on one server or be distributed across multiple servers.

A certain business function in the system can be configured to be completed by a single instance of the service or shared by multiple instances. For example, the streaming service is responsible for connecting 1000 NVR devices, which can be configured on one server or two servers, with each server's streaming service instance responsible for connecting 500 devices.

3) High openness

Adopting a unified device access specification and plugin mechanism, differential shielding and overall integration of interfaces for various devices such as video, alarm, dynamic environment, fire protection, and access control are completed. New devices joining the platform only need to complete plugin development according to the interface specification, and can be integrated into the platform after configuration.

Open all business interfaces of the platform in the form of RESTful API, and combine them with SDK or controls to complete all the functions implemented by the client.

4) High degree of standardization

Adopting standard international norms and protocols can facilitate integration with other business systems and facilitate secondary development. The internal video equipment or system docking of the platform supports international or national standards such as ONVIF/GB-28181/State Grid B interface, and the docking of alarm, dynamic environment, fire protection equipment or systems supports international or national standards such as IEC 61850/IEC 104/MODBUS RTU/TCP.

5) Multi level platform cascading

A networking solution that meets the multi-level vertical management of large-scale systems, facilitating the establishment of multi-level management. The domain technology adopted by the platform enables cascading to be implemented from top to bottom, or from bottom to top for hierarchical networking, which can meet the construction mode of individual networking in each region and centralized networking at higher levels.

4、 Main functions

4.1 alarm linkage

The scope of application for alarm linkage includes perimeter alarm, access control alarm, motion detection alarm, temperature and humidity alarm, video alarm, equipment and server failure alarm, personnel positioning alarm, etc.

The platform supports multi camera video linkage for one point alarm, multi device control linkage, user deployment and disarming, manual alarm suppression, automatic deployment and disarming according to plan, setting alarm cancellation delay and other functions.

An alarm can automatically trigger a series of response actions:

1) Make an alarm prompt sound;

2) Pop up an alarm prompt window and notify users in real-time;

3) Live voice broadcasting;

4) Automatically switch to the corresponding camera video image, with preset positions automatically switched to preset positions, while monitoring the OSD overlay of alarm information on the screen;

5) Capture linkage captures camera video images through SMS ftp、 Upload to the server via email or other means;

6) Linkage control equipment, such as starting on-site lighting, sirens, fans, doors, etc;

7) Activate alarm recording to facilitate retrieval and playback of corresponding image recordings based on alarm information in the future;

8) Generate alarm event records.

4.1.1Common linkage plans

1) Security guard alarm linkage

By triggering intrusion alarms through electronic fences, infrared radiation, small animal detectors, etc., the video images are linked to capture and record, real-time alarm voice is played, linked alarm sirens sound warnings, and reminder messages are sent.

2) Environmental quantity alarm linkage

Temperature over limit alarm, the platform automatically controls the corresponding air conditioner to start cooling or heating through the connected air conditioning controller; If the humidity exceeds the limit alarm, the corresponding area's fan or dehumidifier will be linked for dehumidification, and a reminder message will be sent.

3) Hazardous gas linkage

After detecting excessive concentrations of harmful gases such as SF6, H2S, O3, CO, etc., the fan will be linked for ventilation and a reminder message will be sent.

4) Knife switch action video linkage

When the backend service detects the action signal of the knife switch, it actively turns on the corresponding lighting, automatically pops up the associated video, calls the preset position to rotate to the predetermined angle position, and watches the real-time closing status of the switch knife switch.

4.2 query statistics

4.2.1Alarm event query

Screenshot of Event Record Query Interface

Historical alarm information can be queried in various combinations such as time, location, and alarm type. Display historical alarm information, including alarm name, area name, type, alarm type, alarm level, occurrence time, status, description, confirmation status, confirmation person, confirmation time, etc.

4.2.2Analog data record query

Historical environmental data record query interface

Historical analog data records can be queried in various combinations such as resource subtype, time, alarm status, etc. The query results are displayed in a list and chart format, including analog node names, area names, types, values, alarm statuses, event types, event subtypes, event occurrence times, update times, etc.

4.2.3Query of entry and exit records

Personnel entry and exit record query interface

Personnel entry and exit records can be queried through various combinations such as door nodes, names, card numbers, entry and exit directions, operation types, times, alarm statuses, etc. The query results are displayed in a list format, including door name, area name, door status, direction, operation type, operator, card number, personnel department, occurrence time, etc.

4.2.4Operation log query

Operation log record query interface

The system records user operation information and provides query function, which can trace user operations. Provide queries based on multiple search criteria including operation type, user, time period, and event type.

4.3 System Network Management

The platform can unify the management and monitoring of the operating status of servers and devices in the monitoring system, and report abnormal situations in real time.

For the central server, monitor and analyze the system performance of the server and backend running services, including CPU load rate, memory usage rate, disk usage rate, etc.

Monitor the overall operation status of each subsystem and the operation status of individual devices for the front-end devices connected to the system.

System Service Status Monitoring Interface

Monitoring device status monitoring interface

Video contact status monitoring interface

Data node status monitoring interface

Control node status monitoring interface

5、 Operating environment

5.1 hardware environment

5.1.1server

1) Small scale

CPU: Intel Xeon E3-1230 V2 3.3GHz and above;

Memory: 4GB DDR3 and above memory;

Network card: Intel 1000M NIC * 2;

2) Medium to large scale

CPU: Intel Xeon E5620 2.4GHz and above;

Memory: 4GB DDR3 and abovememory；

Network card: Intel 1000M NIC * 2;

5.1.2Client workstation

CPU: Intel/AMD dual core, 2.4GHz and above;

Memory: 4GB DDR3 and abovememory；

Network card: A 100Mbps or higher network card from Intel or RealTek;

5.2 software environment

5.2.1operating system

It is recommended to use Windows Server 2008 (32/64) or Windows Server 2012 operating system for backend management services;

The client recommends using the Windows 7 or Windows 10 operating system;

BS client recommends using IE8-IE11.

5.2.2database

The platform defaults to using MySQL, although it is also compatible with other mainstream database systems. Considering compatibility factors, it is not recommended to switch to other database management systems unless under special circumstances.

Supported databases: MySQL, SQL Server, Oracle.

VIperformance metrics

6.1 system capacity

1) Front end equipment

- Number of manageable cameras: ≥ 30000 units.

- The number of videos forwarded concurrently by a single streaming server: ≥ 300 channels (2Mb/s stream).

- SingleEach server with alarm functionNumber of forwarded messages per second: ≥ 500.

2) User Management

- Maximum number of users that can be managed: ≥ 3000.

- Number of simultaneous online users: ≥ 1500.

6.2 real-time

Under ideal network conditions, real-time video and audio data transmission latency should be less than 1000ms.

Under ideal network conditions, the response delay for video image switching is less than 1 second.

Under ideal network conditions, the response delay of pan tilt control rotation is less than 1 second.

Under ideal network conditions, the direct linkage response time required to trigger and start video display and recording in the monitoring center after the alarm is triggered is less than 2 seconds.

7、 Case Presentation

GIS partial discharge monitoring

SF6 micro water density monitoring

SF6 gas concentration monitoring

Online monitoring of lightning arrester

Historical Alarms

historical data

live video

video replay