In power system operation, there are many random disturbances or uncertain factors, such as the variation of nodal injections, the change in network configuration and the measuring or forecasting errors. By using the voltage stability analysis with uncertain factors of load variation considered in computation, more information about the critical point and the minimal power margin will be offe...

With the fast development of national economy and electrical load in our cities increasing day by day, existing transmission capacity of 220kV and 110kV high voltage overhead transmission lines can’t meet the need. At present, the technology of multi-circuits in one tower, compacting lines, large cross-section conductors, split-phase conductors and heat-resistant wires can increase the line...

The southwestern area where is resourceful in hydroelectric power, has gradually constituted the electric power system industry which mainly consists of small and medium-sized hydropower generators. Generator takes the most essential part of the electric power system, because the working state of generator affects the security, stability and reliability of the electric power system directly. ...

To select appropriate algorithms is one of the basic issues of microprocessor-based relays.When we select algorithms,we should consider two issues—speed and precision.But the speed is contrary with the precision.In order to acquire higher precision,we will use more hits,which will consume more time and reduce the rate. The algorithms we design should simultaneously meet two points as follow...

A tabu search (TS) based approach is proposed for alarming processing in power systems. First, several existing evaluation criteria describing the alarm processing problem are briefly discussed, and a new criterion is proposed. Secondly, a novel method is developed to solve this problem using a TS based method. Finally, the example is used to demonstrate the feasibility and efficiency of the d...

Load forecasting plays an essential role in power industry. Economic and reliableoperation of a power plant depends significantly on the accuracy of load prediction withdevelopment of power markets. Many researchers have proposed several dozens oftheories and method about load forecasting since 1980s. Among these theories, thepopular thought is to seek for math model and algorithm, which can s...

Based on analyzing all kinds of factors affecting distance protection in theory, this paper analyzes the effect of these factors concretely by simulation. Then a new-style adaptive distance protection principle is proposed. It improves the shortcoming of traditional relay protection. The multi-agent theory is applied in the adaptive distance protection, and the architecture of MAS is built in ...

The Automation of Electric Power System is developing toward open, standardization and distribution.The problem caused by the disunity of communication protocol in electric system, is becoming standing out more and more.The demand for standardization of the protocol and the desirability of constructing a transparent data environment are more urgent.It has become a common problem that realizing...

Network reconfiguration is not only an important method in circulate and control of distribution system, but also an important part of distribution management system. With the development of intelligent technology, it is possible for the use of intelligent algorithm to reduce the eletric network energy loss. The thesis discussed and compared the home and foreign methods and theories of distrib...

Manufacturing Message Specification (MMS) is an application layer communication protocol issued by ISO and can be applied to many industrial fields. IEC61850, which is the basis of the future seamless telecontro1 communication architecture, maps its abstract communication service interface to MMS. It is obvious that MMS is taking a more and more important role in electric power supervisory and...