Non-intrusive method for on-line power load decomposition

A novel non-intrusive method for on-line power load decomposition is introduced. This method is based on the following fact, that in normal operation states of electrical appliances, steady-state currents (including fundamental current and harmonic currents) of electrical appliances have normally certain statistical regularity. In such cases, 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. The experimental results indicate that this method of load decomposition not only has higher precision and better stability but also is easy to be realized on-line.