含扶贫式光伏农村配电网电能质量综合控制技术研究

针对含扶贫式光伏的农村配电网运行特点,提出在逆变器功率控制的基础上,光储联合发电分时协调控制技术。分析了扶贫式光伏电源接入农网后逆变器电压/无功控制原理,在某低压台区建立了光储联合发电系统。其中对逆变器设置死区控制环节保证无功调节优先性,同时分时对光伏电源和储能进行协调控制,平滑功率输出。最后结合Opendss软件对某低压台区进行验证,仿真结果表明所提控制策略能够有效提升农网电能质量运行水平。     

考虑源网荷储协调互动的配电网无功优化

高比例新能源发电是新型电力系统的主要特征,挖掘新能源发电、储能以及柔性负荷等柔性可控资源的无功电压潜力能有效提高新型电力系统运行的稳定性和安全性.文中提出了一种考虑源网荷储互动的配电网无功电压控制方法.该方法从负荷需求侧响应出发,基于市场实时电价信息,以负荷转移成本和用户购电成本为基础,提出基于价格驱动需求响应的负荷平移策略;利用储能系统协调新能源发电出力和负荷平移规则,构建综合考虑源网荷储互动的配电网无功优化模型.通过调节无功补偿设备、储能充放电策略协调新能源出力,在满足负荷需求侧响应需求的基础上达到系统无功电压的最优控制.通过改进的IEEE33节点系统仿真分析,实验结果表明通过源网荷储的充分互动能够有效提高系统无功电压调节能力,实现配电网安全、经济运行.     

响洪甸抽水蓄能电站岩塞爆破水工模型试验与实践

比较了响洪然抽水蓄能电站水下岩塞爆破水工模型试验和原型观测的结果,说明岩塞爆破水工模型试验能较好地模拟集碴坑的堆碴形态和闸门井涌浪等。     

可伸缩悬臂式装煤机的研制

可伸缩悬臂式装煤机适用于仓房开采条件，主要可以提高仓房开采的资源回收率，减轻工人的劳动强度，增加现场作业的安全可靠性。     

某电点火具贮存寿命的研究

在某电点火具主要技术参数的基础上,通过分析电点火具的全寿命过程及其功能,确定了贮存寿命研究的试验方案.试验结果表明,该电点火具在寿命期内,其性能参数无明显变化.模拟长贮试验表明,对于已贮存10a的电点火具其使用寿命还可延长至20～25a.     

Influence of Storage on Physicochemical and Volatile Features of Enriched and Aromatized Wax Organogels

In this study, virgin olive oil (VOO) organogels were produced with beeswax (BW) and sunflower wax (SW) and enriched with β‐carotene, vitamin D₃ and E as well as aromatized with strawberry, banana, and butter aromas. The physicochemical, thermal, structural, and sensorial properties of the fresh organogel samples were determined. The peroxide values, antioxidant activities, firmness, and volatile compositions of the fresh samples and those stored for 3 months were also determined. The organogels were not only stable, uniform, and homogenous during the storage period but also the added components did not affect the organogel properties. The panel defined three appearance, four texture, three mouthfeel, four aroma, and four flavor terms to describe the organogels sensorially. Moreover, the added aroma (banana, strawberry, and diacetyl‐butter) components of the fresh and stored organogels were quantified by GC/MS‐SPME. In conclusion, these results demonstrated that beeswax and sunflower wax are very suitable to preserve the aromatic characteristics of these types of spreadable products.     

MILP scheduling model for multipurpose batch processes considering various intermediate storage policies

MILP (Mixed Integer Linear Programming) scheduling models for non-sequential multipurpose batch processes are presented. Operation sequences of products have to be made in each unit differently by considering production route of each product under a given intermediate storage policy to reduce idle time of units and to raise the efficiency of the process. We represent the starting and finishing time of a task in each unit with two coordinates for a given storage policy. One is based on products, and the other is based on operation sequences. Then, using binary variables and logical constraints, we match the variables used in the two coordinates into one. We suggest MILP models considering sequence dependent setup times to guarantee the optimality of the solutions. Two examples are presented to show the effectiveness of the suggested models.     

MODELLING ADSORPTION EQUILIBRIUM MOISTURE CHARACTERISTICS OF ROUGH RICE

Equilibrium Moisture Content (EMC) data for medium rough rice grain, Lido variety were obtained by equilibrating rice samples at different Equilibrium Relative Humidities (ERH) and Temperatures. The employed models to fit the data were GAB, modified Chung-Pfost, modified Halsey, Modified Henderson, and modified Oswin. The data were evaluated using the standard error of moisture content, mean relative standard error (%P) of the model and the correlation coefficient r². The GAB model by indirect regression described the EMC the best, however its parameters lacked of physical meaning. The modified Chung-Pfost and modified Henderson equations presented a similar fit of the EMCERH relationships. The modified Chung-Pfost equation had lower residual values than the modified Henderson equation and was considered the best model to explain the EMC-ERH relationships.     

EFFECT OF FLUIDIZED BED DRYING ON STABILIZATION OF RICE BRAN

ABSTRACT

Rice bran was treated in a batch fluidized bed at temperatures starting from 90°C up to 130°C in steps of 10°C for different treatment periods. Drying characteristics of rice bran so obtained were used in a mathematical model to predict the maximum possible storage period of rice bran treated under fluidizing conditions. It was observed that the fluidized bed treatment of rice bran requires much lower treatment times for stabilization of rice bran compared with packed bed processes and therefore could be very attractive in commercial applications.     

Effects of Added Phosphates on Lipid Stability During Salt Curing and Rehydration of Cod (Gadus morhua)

Effects of added phosphates on retardation of lipid oxidation of salted cod during processing, storage and after rehydration were investigated. Lipid hydrolysis progress and development of color, primary and secondary lipid oxidation products and fluorescence intensities were determined. Added phosphates significantly retarded lipid hydrolysis and lipid oxidation progress, resulting in lower free fatty acid , lipid hydroperoxides (PV), thiobarbituric acid-reactive substances (TBARS) as well as fluorescence intensities (δF _or and δF _aq). Significant correlation between the lipid oxidation products (PV, TBARS, δF _or and δF _aq) and yellow/brownish discoloration (b* value) of salted cod was observed. Principal component analysis showed that TBARS, b* value and δF _or were the strongest indicators of lipid oxidation during salting and storage.