Energy Digest

A day-ahead power market model introduces a social-welfare-based clearing mechanism to better reflect the complex interactions among market participants. The model reveals that traditional optimal power flow (OPF) dispatch significantly underestimates system security, with demand not served increasing by up to 80%. This study aims to help operators allocate reserves and perform efficient expansion planning strategies.

Grid-forming inverters should behave as a nearly constant voltage source behind an impedance, maintaining a nearly constant internal voltage phasor in the sub-transient to transient time frame. A systematic method has been proposed to quantify the effective impedance of grid-forming inverters using frequency-domain admittance plots. The equivalent impedance model captures the sub-transient response and static voltage stability limit reasonably accurately for standard PSCAD GFM models.