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With the cross regional interconnection of the power grid, it is more and more inconsistent with the actual development of the power grid to use a single sandpile to simulate the power grid. The multi-sandpile model is developed to simulate the evolution process of the whole power grid failure in the form of all the single sandpiles evolving synchronously. First of all, the modeling method of multi-sandpile...
Although AC transmission technology occupies the majority of markets for the benefit of low costs for power delivery within a certain distance; it can no longer keep its dominant status comparing with HVDC when the delivering distance becomes longer. HVDC is in a rapidly growing stage in China due to the immense demand of long-distance transmission. This paper gives an introduction of HVDC projects...
The traditional reliability evaluation assesses the long-term performance of power system but its constant failure rate cannot reflect the time-varying performances in an operational time frame. This paper studies the operational reliability of power system in the real-time operating conditions based on online operation information obtained from the Energy Management System (EMS). A framework of operational...
The performance of a power system in an operational time frame can be evaluated by the short-term reliability assessment. The component reliability model usually uses exponential distribution for the repair time because of its simplicity. However, this assumption may lead to the inaccuracy in evaluation results, especially large errors in short-term evaluation. Therefore, the non-exponential distribution...
This paper proposes a method to obtain a fast and accurate evaluation of the short-term reliability in the online operational timeframe. This method thus provides operators with information on the near-future reliability of the power system and has the ability to warn them when preventive actions might be required. To achieve a sufficient accuracy, this assessment must take into account multi-state...
Constant failure rate model used in the conventional reliability assessment of power systems cannot reflect the impacts of the various operating conditions such as transformer loading, ambient temperature, weather on component reliability. A hybrid conditions-dependent outage model (CDOM) of a transformer is proposed in this paper to include those impacts. The CDOM is the combination of three failure...
Power system's reliability in real-time operating states can be evaluated due to the presentation of the concept and algorithm of operational reliability. Components' reliability models based on real-time operating conditions are established in the algorithm of operational reliability. Fault consequences are analyzed with the consideration of operating conditions, such as power generation dispatches,...
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