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A static security preventive control approach considering thermal inertia of overhead line is proposed in this paper. Combined with dynamic thermal rating (DTR) technology, the approach considers temperature as overhead lines' thermal limit, introduces heat balance equation (HBE) and thermal inertia time constraint of overhead line in preventive control model. Accordingly, the model is more realistic...
Aiming at the disadvantage of Monte Carlo simulation method in slow convergence and using a great number of computation resources, this paper, based on analytical approach, builds a quick power system operational reliability analyzing model. From the viewpoint of operation, this model which is based on Markov chain, assumes that equipment failure rate follows exponential distribution. Its core content...
Because of the discrepancy in time scales and the limitation in transmission capacity, the coordinated decision-making of transmission maintenance scheduling and unit commitment issue has become a complicated optimization problem with temporal and spatial associations. As a result, it is hard to direct solve in practical large scale power grid. On this background, we take a simple six-bus system for...
Static thermal rating method converts the thermal constraint which represents the heat capacity of conductor into electric constraints, using static heat balance equation (HBE). It ignores the phenomenon of thermal inertia, and as a result, it limits the full exertion of line heat capacity, to some extent. Considering the asynchronous characteristic between electricity and heat, the definition of...
The paper proposes a bilevel programming model for security-constrained unit commitment. The upper level solves an optimal power flow problem based on a DC power flow model; the lower level gives the unit commitment results of each subsystems as well as the required lagrangian multipliers for the upper levelthus the two levels can be solved alternately. In this paper a 16-bus system with l9units is...
In electricity markets, ISO has to purchase the proper reserve capacity at some price for maintaining an acceptable risk level of power system. At the same time, the responsibility of each market participant must be quantified explicitly for apportioning the costs of reserves. Unlike traditional deterministic dispatch, this paper maximizes the social welfare with considering the expected surplus of...
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