**Fast Power Reserve Emulation Strategy for VSWT Supporting Frequency Control in Multi-Area Power Systems**

#### **Ana Fernández-Guillamón 1,\*, Antonio Vigueras-Rodríguez 2, Emilio Gómez-Lázaro 3 and Ángel Molina-García 1**


Received: 2 October 2018; Accepted: 11 October 2018; Published: 16 October 2018

**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.

**Keywords:** frequency control; wind power integration; power system stability
