Abstract
The comprehensive entropy of power flow is proposed in this paper based on the current entropy of power flow. The comprehensive entropy can not only describe the heterogeneity of the power flow distribution, but also takes the considerable effect of the high load rate lines on the cascading failure into consideration. Thus it can reflect the operation state in a more comprehensive way compared with the current entropy of power flow. A forewarning model which employs the comprehensive entropy as a forewarning index is also presented. And the case analysis verifies that the proposed forewarning model can assess the risk of cascading failures under the current operation state. It can identify the operation state the cascading failure risk of which accesses the set threshold, thus to help the operators of the power system to protect the power system from cascading failures.
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