Nonintrusive method for on-line power load decomposition

A novel nonintrusive method for on-line power load decomposition was proposed based on the fact that in normal operation states of electrical appliances, steady-state currents(including fundamental and harmonic currents) of electrical appliances have certain statistical regularity. A power load current can be approximately estimated by the linear superposition of the currents components of n main types of electrical appliances when the power load consists of n main types of electrical appliances. The subject of the power load decomposition is to calculate a group of reasonable weight coefficients by an optimization method, so that the estimation current has the maximum similarity with the real current, and therefore the power consumption ratio of different types of electrical appliances can be confirmed. The experimental results indicate that the load decomposition method not only has higher precision and better stability, but also is easy to be realized on-line.