Power is human social activities with the widest application, on people's quality of life impact is the biggest energy. With the continuous development of our national economy, a high degree of social informatization and automation of production are constantly deepen the people to the power dependence, which also contributed to the power industry to increase the reliability of power system management, and strive to provide users with more abundant, continuous, safe and reliable power supply.
In power system, the actual phenomenon, information and data understanding is often imprecise, vague. Using a deterministic data for power system calculation and analysis, can give specific data representation, and can not be the general conclusion.
For power system, with the process, if the degree of uncertainty reduction, actually is to filter out part of the uncertainty of knowledge, in this case, some loss of information, but contribute to the target problem has more explicit understanding; conversely, in order to achieve a high adaptive capacity, often need to be retained in the system originally uncertainty information, namely through the lower system uncertainty to improve the adaptability of the system. In short, whether it is wished to retain the uncertainty of the system, or hope to reduce the uncertainty of the system, are the need for system uncertainty degree of measurement.
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