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SUMMARY This paper explores and compares the performance of alternative voltage control strategies applied to DFIG. Different combinations of reactive power control of rotorand grid-side converters are investigated for voltage control purposes. Simulations are performed using detailed models built in DIgSILENT PowerFactory in order to illustrate the influence of controllers on transient stability of the wind turbine. Operational limits, such as current margins and PWM modulation limits are also taken into account.

• Between 1977 and 1983, 43 patients underwent protectomy (40 patients for carcinoma, three for ulcerative colitis). The subsequent perineal wound received primary closure and the pelvic space was treated with intermittent irrigation and suction drainage using a double-lumen catheter. Primary healing of the perineal wound occurred in 56.4% of cases and in 89.7% of cases the perineal wound had healed completely by the sixth postoperative week. The relationships between perineal wound healing and the age and sex of the patient, the stage of the tumor, and the tumor distance from the anal verge were assessed. The period of hospitalization was significantly reduced when the perineal wound underwent primary healing. The results obtained in terms of wound healing are comparable with the best published results using continuous irrigation. Our method is advantageous in that it does not necessitate immobilization of the patient. (Arch Surg1984;119:1141-1144)