Analysis and Mitigation of SSR in a Doubly Fed Induction Generator (DFIG) Based Wind Farm by Employing a STATCOM Controller

Abstract

The increased integration of transmission networks has given rise to several issues. An obstacle that arises is the requirement for enhanced transmission capacity to facilitate the transfer of a substantial quantity of electricity without compromising the voltage. Series compensation is employed in conjunction with a Doubly-Fed Induction Generator (DFIG) wind turbine when transmitting electricity over long distances. The wind turbine is modeled using MATLAB Simulink, and the generated findings are verified. The wind turbine consists of DFIG is functioning in its typical operational condition. Series compensation causes the occurrence of a phenomenon known as Sub Synchronous Resonance (SSR), which presents a substantial risk to the wind generator. This condition is caused by a change in frequency, which has negative effects on the mechanical components of the generator. If a significant disturbance happens in any part of the study system at any bus bar, the effect of Sub-Synchronous Resonance (SSR) would have a more detrimental impact on the entire performance. There exists a correlation between the compensation percentage employed for series compensation and the influence of Subsynchronous Resonance (SSR). An effective method for mitigating the effects of Subsynchronous Resonance (SSR) involves the utilization of SVC, STATCOM and SSSC. These are called  Flexible AC Transmission System (FACTS) devices. In the presented work, the STATCOM is employed due to its exceptional stability margin, minimized switching loss, and adjustable voltage rating. STATCOM is activated in response to a disruption in the transmission line. It accomplishes this by supplying required amount of reactive power and utilizing real power, so enhancing the overall stability of the power system. The controller of STATCOM initiates a pulse that is transmitted to the STATCOM, allowing it to perform its required job, such as absorbing real power or injecting reactive power. Consequently, the Doubly Fed Induction Generator (DFIG) is safeguarded, guaranteeing the stability of the system.