Abstract
The integration of renewables into power systems involves significant targets and new scenarios with an important role for these alternative resources, mainly wind and PV power plants. Among the different objectives, frequency control strategies and new reserve analysis are currently considered as a major concern in power system stability and reliability studies. This paper aims to provide an analysis of multi-area power systems submitted to power imbalances, considering a high wind power penetration in line with certain European energy road-maps. Frequency control strategies applied to wind power plants from different areas are studied and compared for simulation purposes, including conventional generation units. Different parameters, such as nadir values, stabilization time intervals and tie-line active power exchanges are also analyzed. Detailed generation unit models are included in the paper. The results provide relevant information on the influence of multi-area scenarios on the global frequency response, including participation of wind power plants in system frequency control.
Highlights
Synchronous generators have provided frequency control reserves, which are released under power imbalance conditions to recover grid frequency [1]
With the significant integration of wind power into power systems, grid frequency tends to degrade progressively due to the reduction of the grid inertial responses [6]
With an active-power deficit, different frequency control strategies are addressed by the simulations depending on the generation units involved in the frequency response: case (1)
Summary
Synchronous generators have provided frequency control reserves, which are released under power imbalance conditions to recover grid frequency [1]. With the significant integration of wind power into power systems, grid frequency tends to degrade progressively due to the reduction of the grid inertial responses [6] This new scenario presents a preliminary reduction of reserves from conventional generation units, mainly in weak and/or isolated power systems with high renewable resource penetration [7,8]. These problems would be exacerbated in micro-grids, with a high share of power-electronically interfaced and a low grid inertia [9,10]. Frequency control strategies must be included in wind power plants to provide additional
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