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Analysis of development status and trend of substation integrated automation
Source: | Author:pro0e1941hean | Publish time: 2016-10-08 | 608 Views | Share:
Substation is an important part of the power system, it is responsible for the power conversion and power distribution of the heavy task, the power grid security and economic operation plays a decisive role. In order to improve the level of safe and stable operation, reduce operation and maintenance costs, improve economic efficiency, to provide high quality electricity service to users, integrated substation automation technology began to rise and widely used.
Integrated substation automation is two substation equipment (including control, measurement, protection and automatic device and remote control device etc.) the application of computer technology and modern communication technology. After the composition and function of optimal design, the implementation of automatic monitoring, measurement, control and coordination of the substation, and scheduling communication and integrated automation system. The realization of the comprehensive automation of the substation can improve the security of the power grid, the level of economic operation, reduce the investment in infrastructure, and provide a means to promote the unmanned substation. The rapid development of computer technology, information technology and network technology has led to the development of substation integrated automation technology. In recent years, with the digital electrical measurement system (such as photoelectric transformer or electronic transformer), the development of intelligent electrical equipment and communication technology, substation automation system is developing towards digital direction.
First, the main function of substation integrated automation system
The basic function of substation integrated automation system is embodied in the following 6 subsystems:
1 monitoring subsystem;
2 relay protection subsystem;
3 voltage and reactive power integrated control subsystem;
4 power system low frequency load shedding control subsystem;
5 standby power supply automatic control subsystem;
6 communication subsystem.
This part of the content is rich, and there are a lot of literature on the detailed description, so this paper is no longer detailed.
Two, the traditional substation automation system
1 system structure
At present, the structure of substation integrated automation system in China and abroad, there are three kinds of:
(1) centralized
The different grades of the computer, the extended interface circuit, analog, Centralized Collection Substation Switch and digital information gathering and processing operations were completed, microcomputer monitoring microcomputer protection and automatic control etc.. The characteristic is that the performance requirement of the computer is higher, the ability of the expansion and the maintenance is poor, and it is suitable for medium and small substations.
(2) distributed
According to the substation is monitored object or system function division, multiple CPU parallel work, each CPU using network technology or serial way to achieve data communication. Distributed system is easy to expand and maintain, local fault does not affect the normal operation of other modules. The mode can be installed on the group screen or the split screen group screen.
(3) distributed distributed
The data acquisition control unit, spacer layer (I/O unit) and a protection unit installed near the local dispersed in the switch cabinet or other equipment, the units are independent of each other, only through the communication network, and with the substation level control main unit communication. The functions that can be done at the interval layer do not depend on the communication network, such as the protection function. Communication network is usually the fiber or twisted pair, to maximize the compression of the two devices and the two cable, saving investment in construction projects. The installation can be distributed in various intervals, and can also be concentrated in the control room or a layered group screen, and a part in the control room, and the other part is distributed in the switch cabinet.
2 existing problems
Integrated substation automation system has achieved good results. 1, but there are also shortcomings, mainly reflected in: 1 times and two times the information interaction between or the continuation of traditional cable connection mode, the high cost of construction and maintenance inconvenience; the data acquisition part 2 large amount of two times repeat, a waste of resources; 3 the information is not standardized, low degree of information sharing, the coexistence of multiple systems, between devices between devices and systems interoperability problems, forming islands of information, information is difficult to be applied; 4 when the accident happened, there will be a large number of event alarm information, the lack of effective filtering mechanism, correct judgment of interference of operating staff on duty on the fault the.
Three, digital substation
Digital substation is the next stage of the development of substation automation, "Power Grid Corp" 11th Five-Year "National Science and technology development plan" has been clearly put forward to the research and construction of digital substation demonstration station in the "11th Five-Year" period, and the existing digital substation was built and put into operation, such as the Fuzhou convention 110 thousand volt substation.
1 the concept of digital substation
Digital substation refers to the information collection, transmission, processing, the output process of a fully digital substation, the basic characteristics of intelligent equipment, communications network, operation and management automation, etc..
Digital substation has the following main features:
(1) intelligent equipment
Digital output of electronic transformer, intelligent switch (or intelligent terminal with the traditional switch) and other intelligent primary equipment. The sampling value, the state quantity, the control command and other information of the optical fiber transmission digital coding information are exchanged between the first device and the two device.
(2) network of two devices
Communication network switching analog, switching and control commands and other information between the two devices, the cancellation of control cable.
(3) automation of operation management system
The automation system, such as automatic fault analysis system, equipment health monitoring system and program control system, etc., should be included to improve the automation level, reduce the difficulty and workload of the operation and maintenance.
2 main technical characteristics of digital substation
(1) digital data collection
Digital substation is the main symbol of the use of digital electrical measurement
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