A multi-mode operation for the three-phase PV power system with low-voltage ride-through (LVRT) capability is proposed. With the proposed multi-mode control strategy, the active power from the PV arrays can be continuously extracted by the interleaved boost converter during LVRT while the maximum power point tracking (MPPT) operation can be quickly achieved after the grid fault clearance. Also, the multichannel boost converter with interleaved operation can increase power conversion efficiency while decreasing the input current ripple. On the other hand, the maximum current limitation control (MCLC) of the three-phase inverter can provide maximum reactive power under rated current amplitude during the voltage sag period as well as output the demanded reactive/rated current ratio to meet different LVRT codes. A three-phase 5kVA prototype PV converter is built and tested to verify the performance of the proposed multi-mode operation strategy and the LVRT capability.Index Terms-PV power system, MPPT, Interleaved Converter, Three-phase inverter, LVRT.I. 0278-0046 (c)
TACE combined with PMCT had advantages in prolonging OS with satisfying time to progression and improving liver function in patients with large unresectable HCC. The results suggest that further prospective studies are required to confirm the findings of this study.
ObjectiveTo meta-analytically compare combined transarterial chemoembolization (TACE) plus radiofrequency ablation (RFA) and surgical resection (SR) for the treatment of hepatocellular carcinoma (HCC) within the Milan criteria.Materials and MethodsPubMed, Medline, Embase, and Cochrane Library were searched for studies comparing these two therapies that were published between January 2006 and August 2017. Overall survival rate (OS), recurrence-free survival rate (RFS), major complications and the average length of hospital stay were compared between these two therapies. Meta-analytic pooled odds ratio (OR) was calculated using TACE plus RFA as the base category.ResultsSeven case-control studies and one randomized trial were identified. Meta-analytic results revealed that, compared with SR, TACE plus RFA had significantly higher 1-year OS (OR for survival = 0.50, p = 0.009) and lower major complications (OR = 1.88, p = 0.02) after therapy. Three studies reported on the length of hospital stay. The average length ± standard deviation reported in individual studies for SR and TACE plus RFA groups was 19.8 ± 8.4 days and 7.4 ± 2.2 days, respectively; 18.7 ± 4.9 days and 11.5 ± 6.9 days, respectively; and 16.6 ± 6.7 days and 8.5 ± 4.1 days, respectively (p < 0.0001 for all studies). Three or 5-year OS and 1-, 3-, or 5-year RFS did not significantly differ between the two therapies.ConclusionCombined TACE plus RFA may be an alternative to SR for the treatment of patients with HCC within Milan the criteria. Non-randomized design in most of the original studies was a limitation.
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