CN101447697A - Microcomputer measuring and controlling protective device for centralized type digital transformer substation - Google Patents

Abstract

The invention relates to a centralized digital substation microcomputer measurement and control protection device, which includes a network interface, a hot-swappable redundant power supply, a system control unit module, an optical fiber transmission module, an intelligent heat dissipation system, an on-site display operation module and a man-machine interface processing device. The device adopts a multi-CPU modular design, and the protection function can be flexibly configured according to the requirements. If there is a problem with each board, it will not cause system failure. The human-machine interface uses a touch LCD screen, which can be equipped with a mouse, keyboard and monitor. It is flexible and easy to operate. ;The device follows the IEC61850 standard, and any configuration tool that conforms to IEC61850 can be identified. The expansion made during the entire life cycle of the system is also described and recorded in SCL, so that it can support long-term maintenance of large systems; it supports XML, which is convenient for information in different systems and different Exchange and sharing between platforms.

Description

A centralized digital substation microcomputer measurement and control protection device

technical field

The invention belongs to the field of electric power system automation, and in particular relates to a centralized digital substation microcomputer measurement, control and protection device.

Background technique

Substation automation technology has reached a certain level after more than ten years of development, which has greatly improved the modernization level of power grid construction and enhanced the reliability of power transmission and distribution and power grid dispatching. However, the traditional substation automation system still has the following problems:

1. Interoperability issues: Due to the different communication technologies and protocols adopted by substation automation systems of different manufacturers, there is a lack of interoperability between products, resulting in increased integration and maintenance costs and reduced system reliability.

2. Problems with electromagnetic transformers: traditional transformers have shortcomings such as iron core saturation, poor transient characteristics, and bulky volume, which make it difficult to meet the needs of modern automation technology.

3. Problems with conventional primary equipment: At present, most substations are not equipped with condition monitoring equipment. Due to the lack of primary equipment condition monitoring information, usually only planned maintenance can be used instead of conditional maintenance. At the same time, traditional circuit breaker equipment cannot realize the functions of waveform control closing angle and online monitoring.

4. Cable investment, operation and maintenance costs are high.

The digital substation has successfully solved the above-mentioned problems in the traditional substation, which is an inevitable trend of the development of the power system and the inevitable result of the development of communication technology, information technology and computer technology. The IEC61850 standard and the comprehensive promotion and application of digital technology in substations will be the key to solving these problems. At present, the TC57 working group of the International Electrotechnical Commission has formulated a series of standards for "Substation Communication Network and System" - IEC61850, which provides a unified platform and standard framework for the substation automation system.

With the maturation of technologies such as digital transformers, online status detection of primary operating equipment, and training and simulation of substation operation, as well as the development and application of high-speed computer networks in real-time systems, it is bound to have a profound impact on existing substation automation technologies. Full digitalization The substation automation system is about to be widely used. Through the research and implementation of digital substation technology, improve the technical level and safe and stable operation level of the substation automation system and the entire power grid.

Contents of the invention

The centralized digital substation microcomputer measurement, control and protection device of the present invention is composed of several system control units with the same structure. The measurement, control and protection device of the present invention adopts dual-computer and dual-network redundant configuration to improve the reliability of the entire system.

In the measurement, control and protection device of the present invention, the functional modules of the system control unit all adopt microcomputer equipment that meets the IEC61850 standard to receive digital signals, so as to highlight the characteristics of digital substations, facilitate future upgrades and replace, and save costs.

In the present invention, the integrated monitoring, metering, and protection functions of the main transformer, line, and DC systems are realized by a centralized measurement, control, and protection device, and the system can obtain the information of the whole station that cannot be obtained by traditional protection through the network. Therefore, functions that cannot be realized by traditional protection can be realized.

Other intelligent devices in the station, such as DC systems, UPS, and watt-hour meters, can be directly connected to the system control unit if they can provide protocols and interfaces conforming to IEC61850; otherwise, they can be converted and connected to the system control unit through a virtual server.

The software structure fully complies with the logical node design of the IEC61850 standard, adopts object-oriented dynamic modeling technology, has built-in related logical nodes, supports free distribution of functions, and meets all communication requirements of the IEC61850 standard.

Therefore, the present invention proposes a centralized digital substation measurement and control protection device, which obtains the electrical quantity data of the whole station through the network, and controls the relevant electrical equipment through the network to realize the protection and measurement and control of the relevant electrical equipment. The device includes:

Network interface for connecting various devices;

Hot-swappable redundant power supply provides power for the entire measurement, control and protection device;

Multiple system control unit modules, with embedded processors, serial port expansion devices, and network lead-out devices, are used to measure, control and protect multiple related electrical equipment;

At least one optical fiber transmission module, used to transmit data between various components of the entire measurement, control and protection device;

At least one intelligent heat dissipation system is used to dissipate heat for various components of the entire measurement, control and protection device;

The local display operation module is used to remotely display the status of multiple related electrical equipment, and to control and operate them;

The human-machine interface processor is used to convert the user's operation commands into control actions of multiple related electrical equipment.

The measurement, control and protection device of the present invention is also characterized in that one of the plurality of system control unit modules realizes the measurement, control and protection function of a related electrical equipment, and the number and functions of the plurality of system control unit modules can be adjusted according to user requirements. Free configuration is required,

The measurement, control and protection device of the present invention is also characterized in that the plurality of system control unit modules adopt a rear plug-in plug-in design, and each board can be hot-swapped with electricity, and has automatic identification of plug-ins and error alarm functions.

The measurement, control and protection device of the present invention is also characterized in that the multiple system control unit modules adopt embedded Intel processor units, multi-CPU parallel processing technology, provide dual 100M Ethernet interfaces, and have floating-point coprocessors.

Description of drawings

Fig. 1 is a structural block diagram of a centralized digital substation microcomputer measurement, control and protection device according to the present invention.

Detailed ways

In the original substation automation system, devices or units with various functions are usually used to complete functions such as protection and measurement and control. Considering that new requirements are put forward for the division of functions and screen grouping methods in digital substations, this invention improves the concept of devices or units on the basis of the original substation automation system design, and designs a measurement, control and protection system that realizes the integration of digital substation automation functions. device.

The measurement, control and protection device of the present invention is composed of a network interface, a dual power supply, a system control unit module and an on-site display module. In principle, each system control unit fulfills the functions performed by an original conceptual device or unit. The number and function of the system control unit can be freely configured according to the needs, so as to meet the user's requirements for free configuration of substation functions. The system control unit is based on microcomputer technology to realize protection, measurement, control, communication and other functions; exchange information with station-level and process-level equipment through station-level bus and process bus. The module fully considers the requirements of reliability and openness in the overall design of software and hardware. The rear plug-in design is adopted to ensure the flexible configuration of the system. The board can be hot-swapped, and realize the self-identification and error alarm of the plug-in.

The system control unit adopts embedded Intel processor unit, multi-CPU parallel processing technology, provides dual 100M Ethernet interfaces, and has the characteristics of high-speed processing, stability and reliability, rich resources and easy expansion. The CPU adopts an embedded low-power high-speed processor chip with a processing speed of 800MIPS. It has a floating-point coprocessor, which solves the problem that floating-point operations consume a lot of CPU resources, while the power consumption is only 4.5 watts.

The software structure fully complies with the logical node design of the IEC61850 standard, adopts object-oriented dynamic modeling technology, has built-in related logical nodes, supports free distribution of functions, and meets all communication requirements of the IEC61850 standard.

Each device provides 10M/100M dual Ethernet interfaces; RS232, RS485/422 interfaces are provided for debugging and maintenance.

It has local liquid crystal display and operation functions.

Equipped with a unified engineering system integration tool conforming to IEC61850 standard, it can analyze and generate SCL configuration files, and supports offline and online configuration.

The device can statically establish a communication model based on the configuration information provided by the IED configuration file generated by the tool.

Fully support SCSM protocol stack: TCP/IP, UDP, IEEE802.3, etc.; adopt self-developed MMS protocol stack.

It can realize the integration of protection, monitoring, wave recording, metering and other technologies and the unified configuration based on the total station system, which is of great significance for improving the level of protection and automation and giving full play to the advantages of digital substations. Relay protection is the most important link in substation automation technology, and the realization of centralization of protection functions is also the core of the centralized technology of measurement, control and protection devices of the present invention.

The measurement, control and protection device of the present invention is based on the information of the whole station, takes the substation as a complete protection object, considers the protection function of the whole station in a unified way, and realizes the centralized protection function. Centralized protection not only realizes the centralization of protection technology at different intervals, but also realizes the centralization of the protection logic of the whole station.

The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the present invention. The exemplary embodiments are illustrative only, and not limiting of the scope of the invention, which is defined by the appended claims.

Claims (5)

1, a kind of centralized digital transformer substation microcomputer measuring and controlling protective device obtains the electrical data at full station by network, and realizes protection and observing and controlling to related electric equipment by network control related electric equipment, and this device comprises:

Network interface is used to connect each equipment;

Hot-swappable redundant power is for whole measuring and controlling protective device provides power supply;

A plurality of system control unit modules have flush bonding processor, serial ports expansion device, network ejector, are used for observing and controlling and a plurality of related electric equipment of protection;

At least one Optical Fiber Transmission module is used to transmit the data between each parts of whole measuring and controlling protective device;

At least one intelligent heat dissipation system is used for each parts of whole measuring and controlling protective device are dispelled the heat;

Display operation module on the spot is used for the state of a plurality of related electric equipment of long-range demonstration, and it is controlled and operates;

The man-machine interface processor is used for user's operating command is converted to the control action of a plurality of related electric equipment.

2, centralized digital transformer substation microcomputer measuring and controlling protective device as claimed in claim 1; it is characterized in that a realization in described a plurality of system control unit module to the monitoring and protection function of a related electric equipment, and described a plurality of system control unit module can carry out freely disposing according to user's request on quantity and function.

3, as claim 1,2 arbitrary described centralized digital transformer substation microcomputer measuring and controlling protective devices; it is characterized in that described a plurality of system control unit module adopts the rear loading type insert design; each plate can charged hot plug, and has the automatic identification and the fault alarm function of plug-in unit.

4, as claim 1,2 arbitrary described centralized digital transformer substation microcomputer measuring and controlling protective devices; it is characterized in that described a plurality of system control unit module adopts embedded Intel processor unit; multiple CPU parallel processing technology provides two 100M Ethernet interfaces, has floating-point coprocessor.

5, centralized digital transformer substation microcomputer measuring and controlling protective device as claimed in claim 3; it is characterized in that described a plurality of system control unit module adopts embedded Intel processor unit; multiple CPU parallel processing technology provides two 100M Ethernet interfaces, has floating-point coprocessor.

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