Power system operation and control based on inform

  • Detail

Power system operation and control based on information network integrated transmission

Abstract: network provides a new space for power system operation and control, but also brings great challenges. Networking is the subject that plays a leading role in a long time after the digitalization (computerization) of power secondary equipment. In this paper, some related problems of network-based power system operation and control system (PNCs) are discussed, including development prospects, research status and problems to be solved

key words: networked control power system operation and control information transmission intelligent secondary equipment ambiguity

1 introduction

the safety control of modern large-scale electricity is a complex problem that has not been well solved. The blackout of the United States and Canada in 2003 is an example, and the American Technology Review Magazine has listed it as one of the nine pioneering emerging science and technology fields. The existing control systems in the power system (such as relay protection, integrated automation, power angle stability control, reactive power and voltage control) are independent of each other, and most of them use point-to-point special line communication. If the networked control system (NCS) technology is introduced into the power system, it is expected to provide a new way to solve the security control problems of large-scale systems

ncs refers to the network component in the information transmission path of the control system. Some literatures also call it network control, or control under network environment. NCS has many advantages, such as high reliability, flexible control, easy maintenance, convenient expansion and so on. Once proposed, NCS has been widely used in the domain where the water level in many water tanks is automatically controlled by a water level controller, such as networked household appliances, network-based intelligent manufacturing, etc

ncs is bound to be more widely used in power system due to its great advantages. However, the investment in building special networks is huge, and it is unlikely that the limit of ammonia released from concrete admixtures gb18588 (2) 001 will build their own networks for the functions of epoxy adhesive JC 887 (2) 001 for various specific dry hanging stone curtain walls, Various control information and other operation information of the power system are likely to run on the same power information special network platform (the public network may also be included in the power information network to realize the transmission of some specific information, or as a backup for the transmission of some information under some operation conditions). In this paper, such a special network platform for power information and its associated power secondary equipment are called network-based power system operation and control system (PNCs)

The implementation of PNCs can significantly simplify the connection mode of control equipment, realize the network integration and information sharing of various heterogeneous control equipment, and make some new control functions such as global stability control and global relay protection possible. Its further development may blur the boundaries between the existing power system control equipment. However, the information displayed by various control equipment in power system varies greatly according to the data. There will be some problems in the transmission of control information through the network, such as time delay uncertainty, path uncertainty, data packet loss, information causality loss, etc. these problems must be solved theoretically before the practical application of PNCs. At present, no scholar has clearly proposed to conduct systematic research on this issue. It will be a great challenge for us to solve the above common problems and master the standards and protocols of network-based power system control in the competition of the new generation of power system control equipment

in the past period, digitalization was one of the landmark achievements of power technology development; The application of information network technology should be one of the development themes in the next stage. In the process of digital development, more attention has been paid to the digital research of specific equipment. Compared with digital manufacturing and other fields, there are relatively few macro research work on the concept and common problems of digital. In the process of the development of networking, which research mode to choose is also a problem worth discussing. Based on this understanding and future evaluation, this paper discusses some related issues of PNCs

2 development prospect

the most direct change brought about by networking is the change in the wiring form of substation secondary equipment. Data acquisition and control commands are transferred from point-to-point special line transmission to public network transmission. This change will make the interface of secondary equipment standardized, simplified, easy to maintain and expand. Standardization and simplification means that the same network communication interface is used to collect or output data. The input and output interfaces of secondary equipment will become simple in form and quantity, and different equipment adopt the same technology

after a large number of secondary devices are connected to the substation network, people will consider adjusting the functions of some secondary devices, thus affecting the changes of information transmitted through the network. For example, in the point-to-point era, it is possible to collect the same current or voltage for many secondary devices before filtering. In the networking era, various common pre-processing of these analog quantities can be carried out in the acquisition device, and then the processing results can be transmitted to many secondary devices through the network. Therefore, the composition of substation secondary equipment and the software of various equipment will be changed, and the intelligent digital acquisition device will be widely used

the third stage of development is the data exchange and information integration of various secondary equipment based on the network, so as to realize the unambiguous and reusable substation data. The network provides the widest space for data exchange and data integration, but it is very difficult to complete this step. Considering the large number of secondary equipment manufacturers and the existing digital secondary equipment in the substation, it will take a long time to realize this step

after realizing the unambiguity of substation data, the advantage of networking began to be truly reflected, bringing about the transformation of substation digital equipment, that is, the structural adjustment of digital equipment functions and the endless emergence of new functions and new equipment. Specific examples are as follows: some functions in various existing digital equipment and systems are repetitive, and these repetitive functions can be combined on the basis of no ambiguity in data. After the above development, the functions of many devices have become very simple. With the development of computer technology, the necessity of many devices as physical hardware will be questioned. Many hardware platforms will be merged, the number of substation devices will be significantly reduced, and the structures of different functional hardware platforms will be standardized. The hardware diversity of digital equipment may be gone forever, leaving only standardized hardware platforms, The specific functions are realized by software. In addition, because the network provides a means of contact, the unambiguous data will enable various types of digital devices to communicate with each other, and some new functions that could not be realized before will become a reality, such as the comprehensive analysis and application of power system fault information recorded by various types of digital devices

Copyright © 2011 JIN SHI