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Maximum power point tracking of photovoltaic power generation based on improved fuzzy control and conductance increment method

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Clean Energy 2022年第5期6卷 787-796页

作者： liming wei Bo Yu School of Electrical and Computer Science Jilin University of ConstructionChangchunJilin 130118China

The National Development and Reform Commission of China announced in 2022 that it would promote the development of carbon peaking and ***,gradual improvement in photovoltaic(PV)development technology would gradually show its ***,the development of the PV power generation industry is promoted significantly by the year-on-year increase in PV power *** study combines the traditional fuzzy control and incremental conductance methods by comparing the current maximum power point(MPP)intelligence with the traditional control ***,it proposes an optimization algorithm to improve the tracking speed of the MPP by using the partition variable step *** incomplete partial differential equation is added to the judgment condition of the small step size to solve the problem of oscillation near the MPP caused by the ideal differential equation.A simulation model is established in MATLAB®/Simulink®and the method is simulated under specific *** time to reach the first maximum output point is shortened by 0.21 and 0.14 s by analysing the oscillation process data of three simulation cycles of the incremental conductance,fuzzy control and fuzzy conductance methods,***,the vibration loss caused by environmental mutation is reduced by 6.5%and 3.1%,*** improved incremental conductance method utilizes the simulation results to optimize the problem of steady-state oscillation and improve the efficiency of the PV power *** feasibility and effectiveness of the improved incremental conductance method are verified by comparing the traditional control algorithm with the improved incremental conductance method.

关键词： photovoltaic power generation fuzzy conductance method maximum power point tracking

Research on the maximum power point tracking method of photovoltaic based on Newton interpolation-assisted particle swarm algorithm

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Clean Energy 2022年第3期6卷 496-502页

作者： liming wei KaiKai Li School of Electrical and Computer Engineering Jilin Jianzhu UniversityChangchunJilin130118China

Solar energy has attracted a lot of attention because it is clean and has no ***,due to the partially shaded condition,the photovoltaic array cannot work uniformly at the maximum power point,resulting in a large power *** improve this problem,the research of the maximum power point tracking(MPPT)algorithm is discussed by *** this paper,an improved particle swarm optimization(PSO)algorithm is proposed to achieve the goal of MPPT,which uses Newton interpolation-assisted conventional *** tracking to the maximum power point,the Newton interpolation method is used to calculate the maximum power point,reduce the number of iterations of the conventional PSO algorithm and reduce the steady-state *** simulation is carried out in MATLAB^(■)/Simulink^(■)and compared with conventional *** results show that the improved PSO has better tracking ac-curacy and speed than the conventional algorithm,and the initial tracking speed is increased by>30%.

关键词： photovoltaic array maximum power point tracking particle swarm optimization algorithm Newton interpolation method

考虑风光出力不确定性的风光储微电网系统智能协调控制策略

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技术与市场 2024年第2期31卷 1-7页

作者：操凌皓魏立明吉林建筑大学电气与计算机学院吉林长春130118

对风光储互补的微电网发电系统进行研究,针对风光发电与负载功率不匹配问题,提出了一种基于新型变步长电导增量法的最大功率点追踪控制方法,利用基于Ziegler-Nichols法的改进自适应PID算法实现负载功率蓄电池充放电控制的协同控制策略... 详细信息

对风光储互补的微电网发电系统进行研究,针对风光发电与负载功率不匹配问题,提出了一种基于新型变步长电导增量法的最大功率点追踪控制方法,利用基于Ziegler-Nichols法的改进自适应PID算法实现负载功率蓄电池充放电控制的协同控制策略。通过在MATLAB/Simulink中搭建仿真模型并进行验证,证明了所述方案的准确性以及可行性。

关键词：风光储互补变步长电导增量法最大功率点追踪 Ziegler-Nichols法改进自适应PID算法协同控制策略

Short-term wind power prediction using an improved grey wolf optimization algorithm with back-propagation neural network

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Clean Energy 2022年第2期6卷 288-296页

作者： liming wei Shuo Xv Bin Li College of Electrical and Computer Technology Jilin Jianzhu UniversityChangchunJilinP.R.China

A short-term wind power prediction method is proposed in this paper with experimental results obtained from a wind farm located in Northeast *** order to improve the accuracy of the prediction method using a traditional back-propagation(BP)neural network algorithm,the improved grey wolf optimization(IGWO)algorithm has been adopted to optimize its *** performance of the proposed method has been evaluated by ***,the features of the wind farm are described to show the fundamental information of the experiments.A single turbine with rated power of 1500 kW and power generation coefficient of 2.74 in the wind farm was introduced to show the technical details of the *** wind power data of the whole farm were preprocessed by using the quartile method to remove the abnormal data ***,the retained wind power data were predicted and analysed by using the proposed IGWO-BP *** of the results proves the practicability and efficiency of the prediction *** show that the average accuracy of prediction is~11%greater than the traditional BP *** this way,the proposed wind power prediction method can be adopted to improve the accuracy of prediction and to ensure the effective utilization of wind energy.

关键词： wind power prediction back-propagation neural network improved grey wolf optimization IGWO

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补饲对冷季放牧娟犏牛瘤胃菌群结构的影响

中国草食动物科学 2024年第4期44卷 45-54页

作者：车陇杰魏立明薛瑞林石红梅石斌刚魏晓云甘肃省畜牧技术推广总站兰州730030 甘南藏族自治州畜牧工作站合作747000 甘肃农业大学兰州730070

为了探讨冷季补饲对娟犏牛瘤胃菌群的影响,选取14头5岁龄体况良好的娟犏母牛进行补饲,补饲前记为BQ组,补饲后记为BH组,试验期5个月,并在补饲前、后各采集14例瘤胃液样本进行16S rRNA测序。结果显示,28例瘤胃液样本共获得3581307条原始序... 详细信息

为了探讨冷季补饲对娟犏牛瘤胃菌群的影响,选取14头5岁龄体况良好的娟犏母牛进行补饲,补饲前记为BQ组,补饲后记为BH组,试验期5个月,并在补饲前、后各采集14例瘤胃液样本进行16S rRNA测序。结果显示,28例瘤胃液样本共获得3581307条原始序列(Raw reads),质控后得到3580024条有效序列(Clean reads)。其中,有效标注(Tags)为2994663条,平均有效率在83.27%~83.95%之间。另外,BQ组和BH组的娟犏牛瘤胃中共同存在1275个OTUs,单独的OTUs分别有259个和317个。补饲后娟犏牛瘤胃中变形菌门(Proteobacteria)、脱硫杆菌门(Desulfobacterota)和热原体门(Thermoplasmatota)的相对丰度显著提高(P<0.05)。在属水平,BH组不动杆菌属(Acinetobacter)、丛毛单胞菌属(Comamonas)和赖氨酸芽孢杆菌属(Lysinibacillus)的相对丰度明显高于BQ组(P<0.05)。PICRUST2分析结果表明,27个代谢相关通路在BQ组和BH组之间差异显著(P<0.05),其中氨基酸代谢平均丰度最高,其次是辅因子、维生素代谢和碳水化合物代谢。综上所述,冷季补饲可提高娟犏牛瘤胃中代谢相关菌群的丰度,进而改善冷季放牧娟犏牛的营养平衡状况。

关键词：补饲娟犏牛瘤胃菌群结构

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不同营养水平饲粮对安黑杂交牛生长性能、养分消化和抗氧化性能的影响

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中国畜牧兽医 2024年第8期51卷 3329-3336页

作者：杜兰霞杨瑞鑫刘菲菲郭艳丽魏立明甘肃省畜牧技术推广总站兰州730030 甘肃农业大学动物科学技术学院兰州730070

[目的]旨在研究高、低营养水平饲粮对安黑杂交牛生长性能、养分消化和抗氧化性能的影响。[方法]采用对比试验设计,选取体况良好,体重(206.08 kg±21.87 kg)和月龄(6月龄左右)相近的安格斯(♂)×黑西门塔尔(♀)杂交牛12头(公母各半),随... 详细信息

[目的]旨在研究高、低营养水平饲粮对安黑杂交牛生长性能、养分消化和抗氧化性能的影响。[方法]采用对比试验设计,选取体况良好,体重(206.08 kg±21.87 kg)和月龄(6月龄左右)相近的安格斯(♂)×黑西门塔尔(♀)杂交牛12头(公母各半),随机分为2组,每组6头,分别饲喂高、低营养水平饲粮。其中,高营养水平配方在试验前(1~31 d)、后(32~62 d)期的综合净能(NE mf)分别为5.77和6.00 MJ/kg、粗蛋白质(CP)分别为12.47%和10.44%;低营养水平配方前、后期的NE mf分别为5.42和5.57 MJ/kg、CP分别为9.66%和9.05%。预试期12 d,正试期62 d,试验第1和62天测定体重和体尺;最后8 d进行消化试验,测定肉牛有机物(OM)、CP、粗脂肪(EE)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)消化率。[结果]试验全期,高营养水平组肉牛的平均日增重、平均日采食量和腹围显著高于低营养水平组(P0.05)。高营养水平组肉牛的血清总抗氧化能力显著低于低营养水平组(P0.05)。[结论]与低营养水平配方相比,高营养水平配方饲粮更能促进安黑杂交牛的生长发育。

关键词：安黑杂交牛生长性能养分消化抗氧化性能

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Two complete mitogenomes of Ocypodoidea(Decapoda: Brachyura), Cleistostoma dilatatum(Camptandriidae) and Euplax sp.(Macrophthalmidae) and its phylogenetic implications

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Acta Oceanologica Sinica 2023年第4期42卷 81-92页

作者： Ying Zhang liming wei Bingjian Liu Liqin Liu Zhenming Lü Li Gong National Engineering Laboratory of Marine Germplasm Resources Exploration and Utilization National Engineering Research Center for Facilitated Marine AquacultureZhoushan 316022China Marine Science and Technology College Zhejiang Ocean UniversityZhoushan 316022China

Complete mitochondrial genomes(mitogenomes) can provide useful information for phylogenetic relationships,gene rearrangement, and molecular evolution. In the present study, two newly sequenced mitogenomes of Ocypodoidea(Cleistostoma dilatatum and Euplax sp.) were reported for the first time, which are 15 444 bp and16 129 bp in length, respectively. Cleistostoma dilatatum is the first species in the family Camptandriidae whose complete mitogenome was sequenced. Each mitogenome contains an entire set of 37 genes and a putative control region, but their gene arrangements are largely different. Tandem duplication and random loss model is proposed to account for their gene arrangements. Comparative genomic analyses of 19 mitogenomes clustering in one branch reveal that 18 of them shared the same gene rearrangement, while that of C. dilatatum mitogenome was consistent with the ancestral gene arrangement of Brachyura. The dN/dS ratio analysis shows that all PCGs are evolving under purifying selection. Phylogenetic analyses show that all Macrophalmidae species cluster together as a group, and then form a sister clade with Camptandriidae. Moreover, the polyphyly of three superfamilies(Ocypodoidea, Eriphioidea, and Grapsoidea) is reconfirmed. These findings help to confirm the phylogenetic position of Camptandriidae, as well as provide new insights into the phylogeny of Brachyura.

关键词： Camptandriidae Macrophthalmidae mitogenome gene rearrangement phylogenetic analysis

2种营养水平饲粮对2种牛生长性能、养分表观消化率、血清生化指标和粪便微生物区系的影响

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动物营养学报 2024年第5期36卷 3082-3093页

作者：杨瑞鑫刘菲菲蔡亚楠韩铖星张涛郭艳丽魏立明贠静文甘肃农业大学动物科学技术学院兰州730070 甘肃省畜牧技术推广总站兰州730030 甘肃省家畜繁育改良管理站武威733000

本试验旨在研究2种营养水平饲粮对2种生长牛生长性能、养分表观消化率、血清生化指标和粪便微生物区系的影响。采用2×2双因素随机试验设计,选取月龄(6月龄左右)、体重[(204.63±23.65) kg]相近的安格斯(♂)×黑西门塔尔(♀)杂交牛(安... 详细信息

本试验旨在研究2种营养水平饲粮对2种生长牛生长性能、养分表观消化率、血清生化指标和粪便微生物区系的影响。采用2×2双因素随机试验设计,选取月龄(6月龄左右)、体重[(204.63±23.65) kg]相近的安格斯(♂)×黑西门塔尔(♀)杂交牛(安黑杂交牛)和西门塔尔牛各12头(公母各占1/2),分别随机分为2组,分别饲喂低营养水平[试验前期,综合净能(NE_(mf))为5.42 MJ/kg,粗蛋白质(CP)含量为9.66%;试验后期,NE_(mf)为5.57 MJ/kg,CP含量为9.05%]和高营养水平(试验前期,NE_(mf)为5.77 MJ/kg,CP含量为12.47%;试验后期,NE_(mf)为6.00 MJ/kg,CP含量为10.44%)饲粮。预试期12 d,正试期62 d,分为试验前期(第1~31天)和试验后期(第32~62天)2个阶段,最后8 d进行消化试验。结果表明:与西门塔尔牛相比,安黑杂交牛试验前期平均日增重(ADG)(P=0.076)、对有机物(P=0.051)和CP(P=0.087)的表观消化率、血清尿素氮(UN)含量(P=0.077)和谷草转氨酶活性(P=0.070)有提高的趋势,对中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的表观消化率显著提高(P0.05);在属水平上,高营养水平组粪便苏黎世杆菌属(Turicibacter)相对丰度显著高于低营养水平组(P<0.05)。综上所述,安黑杂交牛的ADG和对CP、OM、NDF和ADF的表观消化率优于西门塔尔牛;高营养水平饲粮更有利于肠道有益菌相对丰度的提高,促进生长牛的快速生长。

关键词：安黑杂交牛西门塔尔牛营养水平生长性能养分表观消化率血清生化指标粪便微生物区系

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发酵乳和乳饮料中乳酸菌活菌数ATP检测方法的开发与应用

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食品安全导刊 2024年第1期 62-66页

作者：王慧魏丽铭刘超喻东威逯刚蒙牛高科乳制品(北京)有限责任公司北京101100 蒙牛乳制品(天津)有限责任公司天津301700 内蒙古蒙牛乳业(集团)股份有限公司呼和浩特011500

乳酸菌活菌数作为发酵乳和乳酸菌饮料的产品质量属性,同时作为国家风险抽检项目,目前的检测方法存在操作烦琐、检测周期长、结果滞后等缺点,无法满足企业产品卖点宣称及质量控制,故针对发酵乳和乳饮料中乳酸菌活菌数的快速检测方法进行... 详细信息

乳酸菌活菌数作为发酵乳和乳酸菌饮料的产品质量属性,同时作为国家风险抽检项目,目前的检测方法存在操作烦琐、检测周期长、结果滞后等缺点,无法满足企业产品卖点宣称及质量控制,故针对发酵乳和乳饮料中乳酸菌活菌数的快速检测方法进行开发、研究,旨在提高检测结果准确性、稳定性及缩短检测周期。每种微生物中的腺嘌呤核苷三磷酸(Adenosine Triphosphate,ATP)含量都是基本恒定的,而ATP的相对发光单位(Relative Luminescence Unit,RLU)与ATP含量呈线性关系,通过建立产品中乳酸菌数量与ATP的RLU(相对发光单位)的相关关系开发乳酸菌快速检测方法。通过试验证实该方法与国家标准检测方法具有一致性,能够快速、准确地检测产品中乳酸菌数活菌数,为生产销售流通中的质量监测提供一种快捷方便的方法。

关键词：乳酸菌总数腺嘌呤核苷三磷酸(ATP) 发酵乳发酵乳饮料快速检测