Self-Organized Criticality in time series of fault in Puyang power grid

This paper analyses time series of fault in Puyang for evidence of Self-Organized Criticality (SOC). The Detrended Fluctuation Analysis of the time series shows prominent long-time correlations. Furthermore, the probability distribution of number of fault per day has a power law tail. Thus, the time series of fault in Puyang distribution system is consistent with SOC. Further analysis shows that the fault data exclude top days of fault following exponential distribution. Since adverse climate is the major cause of faults during the top days of fault, it is implicated that time series of fault in Puyang distribution systems derive its SOC from that of atmosphere system.