Improved event based method for harmonic impedance assessment

Harmonic impedance assessment using prevailing phasors

“…The assessment of prevailing harmonic phasors allows for the independent assessment of individual harmonic impedances. This functionality enables the evaluation of harmonic impedances even if there is no fluctuation in the fundamental voltage, which is an improvement on the methods proposed in [11] and [12]. Furthermore, the implementation of quality controls ( 7) and ( 15) when measuring and aggregating phase angles deny the calculation of harmonic impedances associated with high uncertainty, improving the accuracy of (5).…”

“…Several impedance measurement methods have been developed in [7], [8], [9], [10], [11], [12]. A noninvasive online impedance assessment technique based on naturally occurring disturbances have been proposed in [11].…”

“…A noninvasive online impedance assessment technique based on naturally occurring disturbances have been proposed in [11]. While an improvement of this method was realized through the validation of measurements used for impedance assessments and introducing an adaptive window for Fourier Transforms to reduce spectral leakage, [12].…”

“…The method proposed in [12] uses rapid voltage change events, defined as a 3% change in the system's voltage, at the Point of Connection (PoC) to trigger the harmonic impedance analysis. Analyzing the system's response, through pre-and post-disturbance waveform analysis, allows for the assessment of a network's harmonic impedance.…”

Online Parametric Identification of Power Impedances to Improve Stability and Accuracy of Power Hardware-in-the-Loop Simulations

“…Then, advanced digital signal processing techniques can be applied on the measured voltage and current to identify the impedance of the system under test. Some of proposed solutions in the literature use dedicated power hardware (such as extra electronic amplifier or switching passive loads) to excite the wideband perturbation at power level which are recognized to be invasive methods [8]- [10], while some others use existing power hardware (such as existing power electronic converters or switching passive loads) which are recognized to be noninvasive methods [1]- [7], [11]- [12]. Among the noninvasive solutions, methods for wideband identification of power impedances in conjunction with existing power electronics converters are quite attractive, especially in modern power electronic distribution systems [2]- [7].…”