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Synchronous condensers (SCs) have been reported to improve the overallstability and short-circuit power of a power system. SCs are also beingintegrated into offshore wind power plants (WPPs) for the same reason. Thispaper, investigates the effect of synchronous condensers on an offshore windpower plant with grid-following (GFL) and grid-forming (GFM) convertercontrols. Primarily, the effect of synchronous condensers can be two-fold: (1)overall stability enhancement of the WPP by providing reactive power support,(2) contribution to the effective short circuit ratio (SCR) of the WPP by faultcurrent support. Therefore, this paper focuses on studies concerning theseeffects on an aggregated model of a WPP connected to the grid. To that end, astate-space model of the test system is developed for small-signal stabilityassessment and the synchronous condenser's effect on its stability. Inaddition, a mathematical explanation of SCR enhancement with synchronouscondenser is provided and is verified with time-domain electromagnetictransient simulations.

Small-Signal Stability and SCR Enhancement of Offshore WPPs with Synchronous Condensers