Summary
Penetration of wind power plants in power systems is increasing, which can influence all over the system stability. In this paper, the impacts of variable speed wind turbines based on permanent magnet synchronous generator on transient stability of power systems are evaluated. An analytical method is investigated, and the rotor angle stability of synchronous generators is analyzed in the presence and absence of such wind turbines. Furthermore, it is elaborated under different conditions, eg, different penetration levels of wind power, different control modes of permanent magnet synchronous generator‐based wind turbines, and different distances of wind turbines from synchronous generators. Extensive simulations are carried out under abovementioned conditions, and the results are compared and discussed.
Summary
Reliability is becoming more important as the size and number of worldwide installed wind turbines (WTs) increase. In offshore WTs, reliability evaluation is vital due to their hard and expensive repair and maintenance. Wind turbine producers, if consider reliability, can warrant that their productions will ensure high availability. Power electronic converters play an important role in reliability evaluation of grid connected variable speed WTs. This paper presents a reliability comparison between 3 types of power electronic converters that are conventionally used in the grid‐connected permanent magnet synchronous generator–based wind turbines. Type 1 is back to back converter, type 2 is a pulse width modulation inverter with a conventional boost DC/DC converter and a simple diode rectifier, and type 3 is a pulse width modulation inverter with an interleaved boost DC/DC converter and a simple diode rectifier. The failure rate is calculated for each type of the converters, and then, reliability is calculated and compared. Results show that the type 3 is the most reliable and has the lowest failure rate between the above mentioned types of converters.
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