Experimental time domain harmonic state estimation using partial measurements

The harmonic state estimation analysis has been conventionally developed in the frequency domain. This methodology needs to measure the amplitude and phase angle of the harmonic components of the related waveforms. This paper presents an alternative time domain formulation based on a simplified network model and Kalman filter to assess the global harmonic steady state estimation. Measurements are sampled waveforms registered by a data acquisition system. The proposed methodology has been successfully tested on an experimental electric power test system developed in the laboratory. The reported case study consists of a three phase balanced system with a nonlinear load. An under-determined measurement model case has been tested. The results have been validated by direct comparison of the state estimation response against the actual data taken from laboratory experimental measurements and have also been compared against the simulated values obtained from Simulink®.