Estimating general pollution waveforms in non-monitored electrical system buses

This work studies the estimation of injected currents in internal system buses. It generalizes previous studies on harmonic pollution estimation, such as to allow estimating general injected current waveforms. The electrical network is first modeled in order to derive necessary and sufficient conditions to permit single frequency component estimation. This result is shown to be sufficient when applicable to the desired spectrum region. Digital signal processing techniques are used as a basis to return from frequency-domain back into time-domain, recovering the unknown waveform. An illustrative case supports the theory, indicating excellent match between injected and recovered currents. Computational load is discussed and possible reduction procedures are suggested.