Frequency Control in Autanamous Microgrid in the Presence of DFIG based Wind Turbine

Subject Areas : Renewable energy

Ghazanfar Shahgholian ¹ , Khosro Khani ² , Majid moazzami ³

1 - Department of Electrical Engineering- Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 - Electrical Designer and Supervisor in Iranian Organization for Engineering Order of Building, Isfahan, Iran
3 - Department of Electrical Engineering- Najafabad Branch, Islamic Azad University, Najafabad, Iran

Received: 2014-11-12 Accepted : 2015-01-20 Published : 2015-11-01

Keywords: PSO Algorithm, Frequency control, Micro grid, DFIG based on WT,

Abstract :

Despite their ever-increasing power injection into power grid, wind turbines play no role in frequency control. On the other hand, power network frequency is mainly adjusted by conventional power plants. DFIG-based wind turbines not only are able to produce power in various mechanical speeds, but they can also reduce speed instantaneously which, in turn, leads to mechanical energy release. Thus, they can aid conventional units in system frequency control. In this paper, the effect of wind energy conversion systems, especially variable speed DFIG-based wind turbines, in controlling and tuning of frequency is investigated when different penetration coefficients are considered in a isolated microgrid comprising of conventional thermal and non-thermal generating unit. To do this, optimal tuning of DFIG's speed controller is performed in different penetration levels using particle swarm optimization (PSO) technique. In addition, optimum penetration of wind energy conversion system is studied considering frequency change parameters in a microgrid

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