Abstract
Solar and wind are two promising sustainable resources of energy. These resources are inherently having zero/low inertia and use power electronics for interfacing with the grid. These features make the network damping non-deterministic and may impose Small Signal Stability (SSS) challenges for the operation & control during their increasing share in the grid.This paper analyzes the impact of high penetration of solar photovoltaic (PV) and type-3 wind turbine generator (WTG) on SSS. Participation Factor (PF) and damping ratio sensitivity factor (DRSF) is used to identify if a specific candidate location is beneficial for the penetration of renewable based generators (RGs). But in a network with multiple critical modes, DRSFs of different modes could be equal and opposite at a particular location. Thus, the mere summation of DRSFs can be misleading in such cases because of their mutual cancellation. In this paper, a new Weighted Damping Sensitivity Ratio (WDSR) is proposed to identify the safe/beneficial locations for the integration of RGs. The proposed index assigns weight to the DRSFs of each mode depending on severity of their damping. This eliminates the problem with the amalgamation of DRSFs. The presented strategy also focuses on minimizing the effect of penetration of RGs on damping of the electromechanical modes (EMs) for the stable operation of the network.
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