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An Improved Control Strategy Based on Unified Impedance Model of DFIG under Weak Grid
Yage Zhang,Xueguang Zhang,Ran Fang,Dianguo Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a grid voltage disturbance compensation control to improve the stability of the DFIG system under weak grid condition. A detailed impedance model of the DFIG system is developed in the d-q frame. Based on the proposed model, the relationship between the outputs of the controllers and the grid voltage disturbance at PCC can be obtained. Then, the compensation control of the grid voltage disturbance are integrated to the current control loops of RSC and GSC to improve the stability of the DFIG system connected to the weak grid. In this paper, the effective of the proposed compensation control is proved through the GNC, which illustrates that the compensation control implemented in RSC and GSC simultaneously has a better ability to maintain the stability of the DFIG system under weak grid condition than the only one side used. The simulation results verify the analysis.
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Digital Control of Secondary Active Clamp Phase-Shifted Full-Bridge Converters
Yanbo Che,Yage Ma,Shaoyun Ge,Dong Zhu 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3
A DSP-based self-adaptive proportional-integral (PI) controller to control a DC-DC converter is proposed in this paper. The full-bridge topology is adopted here to obtain higher power output capability and higher conversion efficiency. The converter adopts the zero-voltage-switching (ZVS) technique to reduce the conduction losses. A parallel secondary active clamp circuit is added to deal with the voltage overshoot and ringing effect on the transformer’s secondary side. A self-adaptive PI controller is proposed to replace the traditional PI controller. Moreover, the designed converter adopts the constant-current and constant-voltage (CC-CV) output control strategy. The secondary active clamp mechanism is discussed in detail. The effectiveness of the proposed converter was experimentally verified by an IGBT-based 10kW prototype.
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Digital Control of Secondary Active Clamp Phase-Shifted Full-Bridge Converters
Che, Yanbo,Ma, Yage,Ge, Shaoyun,Zhu, Dong The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3
A DSP-based self-adaptive proportional-integral (PI) controller to control a DC-DC converter is proposed in this paper. The full-bridge topology is adopted here to obtain higher power output capability and higher conversion efficiency. The converter adopts the zero-voltage-switching (ZVS) technique to reduce the conduction losses. A parallel secondary active clamp circuit is added to deal with the voltage overshoot and ringing effect on the transformer's secondary side. A self-adaptive PI controller is proposed to replace the traditional PI controller. Moreover, the designed converter adopts the constant-current and constant-voltage (CC-CV) output control strategy. The secondary active clamp mechanism is discussed in detail. The effectiveness of the proposed converter was experimentally verified by an IGBT-based 10kW prototype.
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Xia Liu,Tengyue Wang,Lan Chen,Limei Li,Yong Wang,Xihong Li,Yage Xing 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.1
‘Lingwu Long’ jujube (Ziziphus jujuba cv. Mill) is a fresh fruit variety that is popular in China. Low temperature storage isan important method for retaining fruit quality postharvest. However, jujube fruits are susceptible to surface pitting underlow temperature storage. Therefore, we performed transcriptome analysis to investigate the changes in gene expression insurface-pitted jujube fruit (SPF). First, we developed cDNA libraries of SPF and surface-intact fruit (SIF) that had beenstored at − 1 ± 0.5 °C. As a result, 21,136,649 and 21,663,126 high-quality clean reads were generated and 47,386 contigswere obtained. Second, we performed sequences annotation by gene description and gene ontology (GO term) analysis,which clustered the genes into three functional groups. A total of 2706 predicted proteins were assigned to specific metabolicpathways by the Kyoto Encyclopedia of Genes and Genomes database. An analysis of differential gene expression betweenSPF and SIF revealed more than 1210 genes that are differentially expressed in jujube in response to surface-pitting under lowtemperature storage, which are involved in lipid, carbohydrate, energy, amino acid, terpenoids, and polyketides metabolism,as well as membrane transport, signal transduction, translation, signal transduction, and biosynthesis of other secondarymetabolites. We investigated the pattern of phenylalanine ammonia lyase gene expression in SPF by quantitative reversetranscriptionPCR analysis. Our results provide new insights into the biology of surface pitting in jujube, which occurs underlow temperature storage. Our findings help confirm the low-temperature tolerance pathways that function in postharvest fruit.
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Xingping He,Dan Chen,Yan Guo,Xi Zhang,Yage Ma,Shenglan Zhao 한국식품영양과학회 2022 Journal of medicinal food Vol.25 No.6
Walnut kernel is a traditional Chinese herb recorded in the Chinese Pharmacopoeia with the efficacies of invigorating kidney, tonifying lung, and relaxing bowel. However, the potential mechanisms were unclear. This article aims to uncover the interdict mechanisms of walnut meal extracts (WMP) on high-fat diet (HFD) induced metabolic disorders in rats and reveal how the WMP benefits are associated with changes in the intestinal flora. Sprague-Dawley (SD) rats were fed a standard chow diet or an HFD for 18 weeks. After 6 weeks, the HFD rats were supplemented with 750 mg WMP/kg body weight or the vehicle for 12 weeks. The structure of gut microbiota was assessed by analyzing 16S rDNA sequences. WMP suppressed the weight gain and visceral obesity. WMP treatment also improved lipid profiles and increased antioxidative activities. WMP fully reversed hepatic steatosis with the upregulation of adipocytokines involved in lipid catabolism (e.g., adiponectin, PPAR-γ, visfatin, CEBPα) and the increased activities of lipoprotein lipase and hormone-sensitive lipase, which were associated with glucose tolerance improvement and insulin resistance (IR) mitigation. As revealed by 16S rDNA sequencing, WMP restored the diversity of intestinal flora reduced by HFD. WMP dramatically reduced the abundance of Gram-negative bacteria, especially Fusobacterium varium and Bacteroides vulgatus, and sharply increased the abundance of Lactobacillus animalis decreased by HFD. Our findings demonstrated that WMP suppressed the weight gain and adiposity in HFD-fed rats and fully reversed HFD induced IR and hepatic steatosis while dramatically reducing the abundance of Fusobacteriaceae and Enterobacteriaceae, underscoring the gut-liver axis as a primary target of walnut polyphenols.
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