Disturbing Load Identification in Power Systems: A Single-Point Time-Domain Method Based on IEEE 1459-2000

This paper presents a single-point method for the identification of prevailing disturbing loads in power systems for both single-phase and three-phase applications downstream or upstream from the metering section. It is based on the simultaneous measurement of three nonactive power quantities, which are based on the IEEE Std. 1459-2000 approach. The proposed method is only based on the separation of the fundamental components from the harmonic content of voltage and current; thus, it does not require any spectral analysis of the voltages and current. In this paper, the formulation of the proposed method and its time-domain implementation are described; moreover, some simulation results are presented and discussed, showing the effectiveness of the method both in the absence and in the presence of the measurement transducers.

I. Introduction

With The deregulation of the electricity markets, new billing strategies can be introduced, taking into account not only the energy consumption but the power quality levels and the responsibilities for disturbances affecting the power networks as well. In this contest, the harmonic distortion is one of the most important features because of the large number of nonlinear and/or time-variant loads that inject harmonics into the line currents. These harmonics also cause disturbances on the supply voltage, which are also conducted through the power system to the other loads, which can absorb a distorted current, even if they are linear and time invariant.