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Dynamic thermal rating (DTR) is an effective technique to improve the ampacity of overhead power transmission lines based on the monitoring of real-time environmental conditions. With DTR technology being introduced, the thermal rating of transmission line is no longer constant but time-dependent. To fully utilize the transfer capability of transmission lines, it is necessary to provide operators...
The frequency of broken-line fault occurred in distribution network is increasing over the past years. Broken-line fault will create negative sequence and zero sequence voltages, which will seriously affect the normal work of loads. However, distribution network has not equipped with special protection against broken-line fault yet. In this paper, single-phase broken-line fault in distribution network...
In this paper, overhead lines' heat balance rule (HBR) is considered in static voltage stability margin (VSM) evaluation issue and an optimal power flow (OPF) based approach for VSM evaluation is proposed. It captures the coupling nature between current & temperature of overhead line and also considers the influence of temperature on series resistance of conductor by introducing heat balance equation...
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...
In this paper, new formulations of the power flow and continuation power flow that allow for electro-thermal coupling in transmission lines have been proposed. The new formulations capture the overhead lines' electro-thermal coupling effects by treating their series resistances as temperature dependent variables. They generate results that can differ from the results of conventional formulations markedly,...
A novel power system online security operational trend analysis method is proposed in this paper. Based on the online operational mode and ultra-short term forecast operational mode (15mins later), the worst contingency set is determined as the union of the worst contingency in online and ultra-short term forecast operational mode, and the power system security evaluation indices are given out online...
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...
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