Non-intrusive load identification event detection method and system

The invention discloses a non-intrusive load identification event detection method and system. The method comprises the following steps: calculating a real-time active power waveform based on a metering point voltage and current waveform collected in real time, and obtaining a fluctuation point of the active power waveform and a fluctuation time point set of the fluctuation point; calculating an active power mean value in a ground state window based on a fluctuation time point set of the fluctuation points, determining an active power accumulated value in a detection window according to the active power mean value in the ground state window, and determining that the current time point is a start/stop transient start point when the accumulated sum is greater than a judgment threshold value; when the transient state is a load state, calculating a difference accumulated sum and a steady-state window variance in the detection window and the steady-state window according to the window width, and when the differenc