Method of Disturbances Interaction: Novel approach to assess responsibilities for steady state power quality disturbances among customers

Statistical analysis of power quality disturbances propagation by means of the Method of Disturbances Interaction

“…Five current component are going to be used: active i a , displaced i Qd , unbalanced active i au , unbalanced displaced i Qu and distorted i D , as described in [4]. The comparison of current components provides information on the active power flow and on the flow of the three considered stationary disturbances, as it is summarized in Table I.…”

“…The currents orthogonal decomposition proposed in [4] allows to analyse how the components of one circuit interact with the components of other circuits connected to the same Point of Common Coupling. Such analysis provides information about the flow of current components and how the components interact.…”

“…The Method of Disturbances Interaction -M D I consists in performing an orthogonal decomposition of currents and comparing them using the reference conditions described in [4]. The proposed decomposition is based on the FBD Power Theory proposed by Depenbrock [14], [15] for stationary cases and on the current decomposition presented in the German Standards 40110-1 and 40110-2 [16], [17], which are based partially on Depenbrock's power theory as well.…”

“…If no normalization were employed (2), diagonal values would be the squared rms values. The sum of all values of the column corresponding to the circuit X, is always zero due to the currents ordering decribed in the first M D I step, further details can be found in [4]. This means that the current rms value I k X is the sum of the inner products of i k X times the currents of the resting circuits, for example at the circuit B:…”

“…A Currently there are many proposed methods to evaluate the origin of stationary disturbances in Power Quality, most of them resort to different power definitions and power based criteria, see [2] to [7]. A Method was proposed to assess responsibilities called the Method of Disturbances Interaction M D I [4]. The M D I resorts to a power based current decomposition, capable to provide information about the stationary disturbance content of the signals flowing to all circuits connected to a Point of Common Coupling.…”