Permanent Magnet Synchronous Generators for Large Offshore wind farm connected to Grid - Comparative study between DC and AC configurations

Year 2014, Volume: 4 Issue: 2, 519 - 527, 01.06.2014

Djamel Iknı Morlaye Sekou Camara Mamadou Baïlo Camara Brayima Dakyo Hamid Gualous

Abstract

This paper presents a comprehensive analysis of the ability of the large offshore wind farms of 10MW to meet the requested energy imposed by the grid code using DC and AC configurations. In DC configuration, the wind turbines are linked to DC-bus through the rectifiers, and all produced energy is injected in electrical grid via an inverter.  In AC configuration, each wind turbine has a back to back converter for produced energy management, and the all subsystems are connected to grid through an AC-bus. The contribution of the paper presents two aspects: -The first aspect is focused on the energy management strategies using balance control, delta control and absolute control. -The second is related to the performances comparative study between the DC and AC configurations. For all configurations, the speed of the permanent magnet synchronous generator, the DC-bus voltage, and the exchanged power between wind farm and the network are controlled using grid code constraints (balance control, delta control and absolute control). To show the performances of the control strategies, some simulation results obtained with DC and AC configurations are presented and analyzed using Matlab/Simulink software.

Keywords

Active and reactive power control; AC/DC converter; Grid code ; DC/AC converter; DC-bus voltage control; Offshore wind energy management; Permanent Magnet Synchronous Generator (PMSG); Speed control; Maximum Power Point Tracking (MPPT).

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