Abstract
The increasing penetration of wind energy to the conventional power system due to the rapid growth of energy demand has led to the consideration of different wind turbine generator technologies. In fault conditions, the frequency of the power system decreases and eventually leads to speed differences between the grid and the interconnected wind generator. This can result to power system problems such as transient instability (TS). This paper focuses on enhancing the TS of a permanent magnet synchronous generator (PMSG)-based power system during 3ph fault conditions using FACTS devices. The power system considered is connected to a large wind farm which is based on PMSG. Critical clearing time (CCT) is used as an index to evaluate the transient state of the system. Under the study of an IEEE-14 bus system using PSAT as a simulation tool, the integrated CCT with PMSG-based wind turbine is improved with three independent FACTS devices. One of the synchronous generators in the test system has been replaced at random with the PMSG-based wind turbine which is meant to generate an equivalent power. Time domain simulations (TDSs) were carried out considering four study cases. Simulation results show that the (CCT) of the system with the FACTS devices is longer than the CCT without them, which is an indication of TS improvement.
Highlights
IntroductionWind has been noted to be the fastest growing one due to its clear and numerous advantages [1]
Among renewable power sources, wind has been noted to be the fastest growing one due to its clear and numerous advantages [1]
Transient stability (TS) which is the tendency of synchronous generators remaining in synchronism following a severe disturbance [1,2,3,4], is one of the major aspects of a power system that gets affected with the integration of large wind turbines
Summary
Wind has been noted to be the fastest growing one due to its clear and numerous advantages [1]. Unlike DFIG, the PMSG has a full-scale power converter [5]. It enables more reliable operation of wind turbines and reduces the required maintenance [6]. These features make PMSG more advantageous than DFIG. Most wind energy conversion technologies employ turbines with PMSG [7, 8]. Even though the PMSG has a better reactive power capability, it is still not adequate as the principal precaution during transient conditions [9,10]. There is a need to augment the dynamic reactive power capability of FACTS devices in order to strengthen the transient state of the system to which it is connected
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