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Introduce the viewpoint of interruptible load into N-1 static security analysis of transmission capacity of transmission section; broaden the conditions of traditional N-1 analysis through using the interrupt load management in receiving areas. A detailed mathematical model of the power flow constraints of transmission section considering the interruptible load is established and the solving methods...
Conventional power system security analysis based on multiple case studies cannot predict all operational states and hence neither guarantees an adequate security margin nor an economical operation for the power system. Based on the trend analysis method which is used in the field of economics, this paper introduces the concept and a methodology for “trend security analysis” of power systems. This...
Power System will be inevitably influenced by the environment during its operations. However, little attention is paid to this aspect in traditional power system analysis methods, which can cause errors in the calculation results and even endanger the security of the system. Through comprehensively analyzing the thermal balance and temperature ascending process, this paper sets up an environment-considering...
The calculation of the large-scale Interconnected power grid is a difficult task, because on the one hand, the mathematical model's dimension of the problem may be too large for numerical solving, on the other hand, under the hierarchical control mode, each control center can only obtain the information of the system in its own region and therefore is inadequate for accurate analyzing. In view of...
During the operation of modern power system, the unanticipated occurrence of large disturbances, communication errors, exceptions in SCADA system and lacking of maintenances etc will affect the normal operation of state estimation, which plays a significant role in keeping the security of power system. Therefore, to seek a state estimation algorithm that can keep fairly good momentum and can obtain...
Began with a brief introduction of the basic principle and structure of SCADA system, this paper analyses the 3 practical problems exist in traditional state estimation, which is based on an isolated time section. It also points out that the problems cannot be eliminated by directly revising the existing algorithm and hence a new method of state estimation should be found from the methodology. On...
In modern power system, a single fault seldom leads to the catastrophe like blackout, but often causes other faults, which result in cascading failures and blackouts. Therefore simulate the cascading process of power system is more meaningful than a single device contingency analysis. Against such backgrounds, this paper proposes a method for cascading failure simulation with static security analysis...
Power system is a wide-area distributed system whose dynamic behavior is very complex. To analyze and control such a system, it is either too difficult to set up a particular and accurate mathematic model or the hypothetical conditions for setting up the model are difficult to be satisfied in practice. However, the human behavior, which is ball-catching theorem studied in robotics, tells us that we...
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