A novel control system design to improve LVRT capability of fixed speed wind turbines using STATCOM in presence of voltage fault

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This paper investigates the role of reactive power compensator STATCOM and presents a control system based on simultaneous control of STATCOM reactive power and pitch angle of rotor blades for improving stability margin of speed of induction generator. As it can be seen in Fig. 12. critical clearing time i.e. maximum fault duration that can occur in the system and yet system is able to return to its steady state. is improved by using STATCOM compensator. In addition. when a STATCOM compensator is used. by increasing STATCOM capacity from 100 to 500 Kvar. critical clearing time increases from 104 ms to 731 ms while the same rate of increasing the capacity of STATCOM using proposed control system that controls the flow of reactive power of STATCOM and pitch angle of the blades. the critical fault clearing time increases from 158 ms to 843 ms.