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This paper presents a method for determining the double outage contingencies that threaten the system without solving the full contingency set. Two methods for contingency screening with complementary properties are presented. The results of the algorithms are compared to the full double outage contingency analysis results for a large North American case. The results show that the screening algorithms...
Circulating power flows are possible in power systems and can lead to unnecessary power losses and voltage drops in the transmission system. The most common example is circulating Mvars caused by transformers with unbalanced tap ratios. This paper presents an algorithm to detect circulating real and reactive flows in a power system and also provides a metric to rank the severity of these circulating...
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