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Dual Control Strategy for Grid-tied Battery Energy Storage Systems to Comply with Emerging Grid Codes and Fault Ride Through Requirements

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 977-988页

作者： maxime berger Ilhan Kocar Evangelos Farantatos Aboutaleb Haddadi Department of Electrical Engineering Polytechnique MontréalMontréalCanada Electric Power Research Institute(EPRI) Palo AltoUSA

Battery energy storage systems(BESSs)need to comply with grid code and fault ride through(FRT)requirements during disturbances whether they are in charging or discharging *** literature has shown that constant charging current control of BESSs in charging mode can prevent BESSs from complying with emerging grid codes such as the German grid code under stringent unbalanced fault *** address this challenge,this paper proposes a new FRTactivated dual control strategy that consists of switching from constant battery current control to constant DC-link voltage control through a positive droop *** results show that the strategy ensures proper DC-link voltage and current management as well as adequate control of the positive-and negative-sequence active and reactive currents according to the grid code *** is also shown that the proposed FRT control strategy is tolerant to initial operating conditions of BESS plant,grid code requirements,and fault severity.

关键词： Battery energy storage system inverter-based resource fault ride through electromagnetic transient

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Large-signal modeling of three-phase dual active bridge converters for electromagnetic transient analysis in DC grids

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1684-1696页

作者： maxime berger Ilhan KOCAR Handy FORTIN-BLANCHETTE Carl LAVERTU Polytechnique Montreal MontrealCanada Bombardier Transportation St-Bruno-de-MontarvilleCanada Ecole de Technologie Superieure MontrealCanada

The three-phase dual active bridge(3 p-DAB)converter is widely considered in next-generation DC grid *** for traditional AC grids,the successful integration of power electronic converters in DC grids requires accurate time-domain system-level *** demonstrated in the existing literature,the development and efficient implementation of large-signal models of 3 pDAB converters are not *** this paper,a generalized average model is developed,which enables system-level simulation of DC grids with 3 p-DAB converters in electromagnetic transient type(EMT-type)*** proposed model is rigorously compared with alternative modeling techniques:ideal-model,switching-function and state-space *** is concluded that the generalized average model provides an optimal solution when accuracy of transient response,reduction in computation time,and wideband response factors are considered.

关键词： Three-phase dual active bridge(3p-DAB) Generalized averaging Large-signal analysis Electromagnetic transient DC–DC conversion

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Meta-Analysis Study of the Effects of Yeast Probiotic Supplementation on Milk Production and Energy Corrected Milk of Lactating Dairy Cows

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Agricultural Sciences 2023年第9期14卷 1179-1192页

作者： Nizar Salah Héloïse Legendre Pauline Peltier Pain Clara berger Valentin Nenov Francois Machuron maxime Briche Phileo by Lesaffre Marcq-en-Baroeul France Lesaffre International Marcq-en-Baroeul France

The aim of this study was to use a meta-analytic approach to evaluate the effect of commercially available yeast probiotic “Actisaf® Sc 47” (Saccharomyces cerevisiae CNCM I-4407) produced and marketed by Phileo by Lesaffre on milk performance in dairy cows. Data from 22 trials including 17 with parallel designs and 5 with cross-over designs were collected, and only data with parallel designs were analyzed. From those trials, 4 are published and 13 are from technical reports. In total, 34 comparisons and 1074 dairy cows met the criteria for inclusion in the final analysis of milk yield (MY). For energy corrected milk (ECM), six trials with 12 comparisons and 476 dairy cows met the criteria for inclusion in the final analysis. Because the data are from different trials with different conditions, the statistical model defined includes the fixed effect of the treatment (with vs. without Actisaf® Sc 47) and the random effect of the trial. The meta-analysis showed a moderate heterogeneity for MY and ECM. The random effect meta-analysis showed an estimated mean difference +1.72 kg/d [95% confidence interval (CI): 1.01 to 2.44] and +2.45 kg/d (95% CI: 1.73 to 3.17) for MY and ECM respectively, in favour of Actisaf® Sc 47. The analysis of data without trials conducted under heat stress conditions showed positive effect of Actisaf® Sc 47. The random effect meta-analysis showed an estimated mean difference of +1.69 kg/d [95% CI: 1.24 to 2.14] and +2.92 kg/d (95% CI: 2.45 to 3.40) for MY and ECM respectively, in favour of Actisaf® Sc 47. These observations provide strong evidence that this commercially available yeast probiotic can significantly improve milk performances of dairy cows under different conditions.

关键词： Milk Yeast Probiotic Meta-Analysis

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