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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.
Miyasaka, Yoko,Barnes, Marion E,Petersen, Ronald C,Cha, Stephen S,Bailey, Kent R,Gersh, Bernard J,Casaclang-Verzosa, Grace,Abhayaratna, Walter P,Seward, James B,Iwasaka, Toshiji,Tsang, Teresa S M Academic Press 2007 European Heart Journal Vol. No.
<P>AIMS: To estimate the incidence of dementia after the first atrial fibrillation (AF), and its impact on survival in a community-based cohort. METHODS AND RESULTS: Olmsted County, Minnesota adult residents diagnosed with first AF during 1986-2000 were identified, and followed until 2004. The primary outcome was new detection of dementia. Interim stroke was censored in the analyses. Of 2837 subjects (71 +/- 15 years old) diagnosed with first AF and without any evidence of cognitive dysfunction or stroke at the time of AF onset, 299 were diagnosed with dementia during a median follow-up of 4.6 years [interquartile (IQR) range 1.5-7.9 years], and 1638 died. The Kaplan-Meier cumulative rate of dementia was 2.7% at 1 year and 10.5% at 5 years. After adjustment for age and sex, dementia was strongly related to advancing age [hazard ratio (HR)/10 years, 2.8; 95% confidence interval (CI), 2.5-3.2], but did not vary with sex (P = 0.52). The occurrence of post-AF dementia was associated with significantly increased mortality risk (HR 2.9; 95% CI 2.5-3.3), even after adjustment for multiple comorbidities, and did not vary with age (P = 0.75) or sex (P = 0.33). CONCLUSION: Dementia appeared common following the diagnosis of first AF, and was associated with premature death.</P>