This study presents the design of a robust active disturbance rejection (ADR) controller in order to improve lowvoltage ride-through (LVRT) capability of wind farms connected with doubly fed induction generator (DFIG). The ADR controller is particularly effective in real-time estimation and mitigation of the total effect of various uncertainties against a wide range of parameter variations, model uncertainties and large disturbances. The performance evaluation of the designed controller is performed on an IEEE system under different test cases. The simulation results show that the proposed controller is robust against uncertainties in operating conditions and successfully improves the damping and voltage stability and thus the LVRT capability of DFIGs.

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Bidirectional Glenn Shunt is a palliative procedure in single ventricle or hypoplastic right ventricle, tricuspid atresia and pulmonary stenosis complex where definitive repair is not feasible as well as a intermediate step of Fontan procedure. It is done by anastomosing superior venacava with right pulmonary artery or conduit can be used. We were forced to do the anastomosis between superior venacava and left pulmonary artery using a conduit as anatomy wasn’t favorable. Due to unavailability of any recognized conduits we used autologous pericardium and created a conduit with it to carry out anastomosis. Post-operative results were satisfactory. Cardiovasc. j. 2020; 13(1): 92-94

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