http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Optimum and Adjustable Damping Control of Grid-Connected Inverter with an LCL Filter
Toshiji Kato,Kaoru Inoue,Yusuke Akiyama,Koki Ohashi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a simple and general active damping method with good suppression effects by the optimal control principle with the state feedback approach. It may reduce number of sensors by estimations with a state observer. The proposed method can enhance the damping effects by adjustment of control parameters which correspond to a sort of virtual resistors. Its general design method and examples are described. The regulated current error transfer-functions at the oscillation frequency of the filter are suppressed effectively by validation through simulation by SABER and experiment by a DSP-based digital control system.
Katsuya Saito,Takakazu Ushioda,Takahiro Miyata,Keita Mayanagi,Koki Kato,Joji Inamasu,Masashi Nakatsukasa 대한뇌혈관외과학회 2023 Journal of Cerebrovascular and Endovascular Neuros Vol.25 No.3
We describe a rare case of sacral epidural arteriovenous fistulas (edAVFs) with atypical clinical course of treatment. A 78-year-old man with a history of spinal surgery presented progressive gait disturbance and urinary incontinence. Spinal angiography demonstrated a sacral spinal AVF fed by bilateral lateral sacral arteries, draining to the venous pouch with subdural drainage. The first treatment by direct interruption of a subdural drainer was incompletely finished. Postoperative reassessment by 3D imaging analysis led to the diagnosis of sacral edAVF and 3D understanding of its angioarchitecture. The second treatment by transarterial embolization (TAE) resulted in complete occlusion of a sacral edAVF. However, spinal venous congestion didn’t improve, because the recruitment of occult edAVFs at the multiple lumbar levels and complex-shaped sacral ventral epidural venous plexus (VEP) were involved in the remnant of prior subdural drainage. The third treatment was performed by TAE for three occult edAVFs and the VEP compartment connecting between a patent edAVF and subdural drainage, which resulted in complete disappearance of spinal cord edema. Endovascular embolization of VEP compartment connecting to subdural drainage in addition to fistulous occlusion may be one of the treatment options for several edAVFs at the multiple spinal levels.