Transient Stability Analysis of Power System by Coordinated PSS-AVR Design Based on PSO Technique

In this paper, Power System Stabilizer (PSS) and Automatic Voltage Regulator (AVR) are coordinated to improve the transient stability of generator in power system. Coordinated design problem of AVR and PSS is formulated as an optimization problem. Particle Swarm Optimization (PSO) technique is an advanced robust search method by the swarming or cooperative behavior of biological populations mechanism. The performance of PSO has been certified in solution of highly non-linear objectives. Thus, PSO technique has been employed to optimize the parameters of PSS and AVR in order to reduce the power system oscillations during the load changing conditions in single-machine, infinite-bus power system. The results of nonlinear simulation suggest that, by coordinated design of AVR and PSS based on PSO technique power system oscillations are exceptionally damped. Correspondingly, it’s shown that power system stability is superiorly enhanced than the uncoordinated designed of the PSS and the AVR controllers.

Robust Parameter Coordination for Multidisciplinary Design

This paper introduced a robust parameter coordination method to analyze parameter uncertainties so as to predict conflicts and coordinate parameters in multidisciplinary design. The proposed method is based on constraints network, which gives a formulated model to analyze the coupling effects between design variables and product specifications. In this model, interval boxes are adopted to describe the uncertainty of design parameters quantitatively to enhance the design robustness. To solve this constraint network model, a general consistent algorithm framework is designed and implemented with interval arithmetic and the genetic algorithm, which can deal with both algebraic and ordinary differential equations. With the help of this method, designers could infer the consistent solution space from the given specifications. A case study involving the design of a bogie dumping system demonstrates the usefulness of this approach.

Novel Zn(Ⅱ) ladder-like coordination polymer constructed from designed ferrocenyl ligand

Reaction of Zn（NO3）2·6H2O with 3-（4-carboxylphenylamino）-l-ferrocenyl-2-butylen-l-one （HL） and 4,4′-bipyfidine （4,4′- bipy） in methanol solution resulted in a novel ladder-like coordination polymer {[Zn2L2（μ2-L）2（4,4′-bipy）2]·MeOH}n （1）. Its crystal structure, thermal and electrochemical properties are presented.

PARAMETER COORDINATION AND ROBUST OPTIMIZATION FOR MULTIDISCIPLINARY DESIGN

A new parameter coordination and robust optimization approach for multidisciplinary design is presented. Firstly, the constraints network model is established to support engineering change, coordination and optimization. In this model, interval boxes are adopted to describe the uncertainty of design parameters quantitatively to enhance the design robustness. Secondly, the parameter coordination method is presented to solve the constraints network model, monitor the potential conflicts due to engineering changes, and obtain the consistency solution space corresponding to the given product specifications. Finally, the robust parameter optimization model is established, and genetic arithmetic is used to obtain the robust optimization parameter. An example of bogie design is analyzed to show the scheme to be effective.

Design and Application of Coordinator App Based on Needs Survey

The clothing industry is booming,and clothing prices are more affordable today.People's requirements for clothing are no longer limited to the question of enough clothing to wear.In order to solve the main problem that consumers have a lot of clothes but don't know how to match and look good,this article aims to design a matchmaker application(app)-Coordinator app.Through analyzing the current situation of existing apparel matching apps and typical case,the paper summarizes the existing clothing,the advantages and disadvantages of matching apps,and the combine with user needs survey feedback,to design the main four modules required by the Coordinator app which are elaborated and displayed separately.

Spatial Processing and Coordination Design of Indoor and Outdoor Space

From the review of development history of indoor design in China, we can see that it develops rapidly from sprout to expansion, and has large professional scale. It goes through ignorance, misconception and comprehensive understanding. And it has developed into a perfect and independent composite subject. From the perspective of interior design continuing architectural design in time-space dimension, the paper focuses on observing the application analysis of coordinated interior design, which not only provides reference for interior design in China, but also improves the interior design in China.

Effects of Quality and Quantity of Information Processing on Design Coordination Performance

It is acknowledged that lacking of interdisciplinary communication amongst designers can result in poor coordination performance in building design. Viewing communication as information processing activity, this paper aims to explore the relationship between interdisciplinary information processing (IP) and design coordination performance. Both amount and quality are concerned regarding information processing. 698 project based samples are collected by questionnaire survey from design institutes in China's Mainland. Statistical data analysis shows that the relationship between information processing amount and design coordination performance follows a nonlinear exponential expression: performance = 3.691 (1-0.235IP amount) rather than reverted U curve. It implies that design period is too short to allow information overload. It indicates that the main problem in interdisciplinary communication in design institute in China is insufficient information. In additional, it is found the correlation between IP quality and coordination process performance is much stronger than that between IP amount and coordination process performance. For practitioners, it reminds design mangers to pay more attention to information processing quality rather than amount.

Training Sequence Design for Coordination on Multiple Point System

Although the Cramer-Rao Bound(CRB) can be used as the benchmark of estimation algorithm performance,it's too complicated for joint training sequence(TS) design for multiple input multiple output(MIMO) orthogonal frequency division multiplexing(OFDM) coordination on multiple point(CoMP) systems.So a minimum mean square error(MSE) based sub-optimal sequence design criterion was proposed,including ideal sequence correlation property and sequence length constraint.The simulation results verify the theory analysis.

面向综合能源协调的虚拟电厂调控平台设计与规划优化

为解决综合能源协调调度难题,文章提出了基于虚拟电厂调控平台设计和综合能源协调调度模型。通过分析虚拟电厂的基本网架结构,设计了虚拟电厂总体架构,分为资源层、平台层和应用层,并设计了网络架构和数据流架构。基于该架构建立了面向综合能源协调的虚拟电厂调度应用模型。针对模型内光伏、风力发电、电解器、燃料电池、氢气储能、电池储能,以可靠性指标作为切入点,提出了全生命周期内成本最小的目标函数。通过算例分析,验证了文章所提出的模型在可靠性和成本方面的优势。

水资源、水环境、水生态统筹治理研究进展

水资源、水环境和水生态统筹(三水统筹)治理作为习近平新时代中国特色社会主义思想在水治理领域的生动实践,对推动流域水生态环境持续改善、促进美丽河湖保护与建设具有重要指导意义.研究详细综述了以水资源、水环境和水生态为核心的水治理理论的发展基础、制度设计与绩效评估、关键路径与保障机制.最后指出未来“三水统筹”治理研究需解决“谁来统筹”“统筹什么”“怎么统筹”“何时统筹”“何地统筹”等基本问题,即“三水统筹”治理的理论框架须涵盖各项价值目标、制度设计、行为选择和条件环境等;协同主体类型须多样化,涉及政府、企业、公众和社会组织;协同方式基于“整体性”和“共享性”特征;完善水治理的学术脉络、政策实践及绩效评估.

基于C#的最佳抵偿高程面选取软件设计与应用

规范规定建立或选择平面坐标系统的前提条件是测区内投影所引起的长度变形不大于25 mm/km。某测区公路工程施工控制网采用国家坐标系不能满足这一要求,为减小高斯投影长度变形所带来的影响,本研究选用膨胀椭球与重心坐标不变法建立工程抵偿坐标系,并基于C#语言进行抵偿坐标系最佳抵偿面选取软件设计。研究结果表明,该计算方法严密、可靠,软件计算结果快速准确,可以实现抵偿坐标计算的自动化处理,能够满足规范要求,可直接应用于工程生产。

基于信创环境的水利智搜优化设计与研究

为提高水利智搜数据采集效率、个性化推荐程度、协调运维能力、信创环境适配程度,向社会公众提供便捷高效的水利信息检索服务,结合核心技术自主可控的必然要求,研究运用数据采集、搜索推荐模型等智能化处理技术,进一步优化搜索算法,加强数据信息采集。同时,通过优化水利智搜平台设计,基于信创环境适配优化,采用集成式、场景式和交互式一体化数据呈现方式,提升支撑、统计分析、搜索和聚合能力,实现精准化推荐和协同化运维。基于信创环境的水利智搜优化设计与研究,可为水利行业智能化信息检索服务提供经验借鉴。

大口径火炮弹协调器机构可靠性优化设计研究

为提高弹协调器的交弹效率,同时保障协调交弹动作具有高可靠度,开展某弹协调器机构的可靠性优化设计。考虑主要几何尺寸、制造误差、重要构件弹性变形等影响因素,建立某弹协调器的参数化刚柔耦合动力学模型,通过参数化动力学分析,复现协调器的协调交弹动作失效,并建立相对应的功能函数及协调器可靠性优化设计模型。针对协调器可靠性优化模型,为提高优化设计的效率和精度,构建新的Kriging模型自适应更新策略,并与序列二次规划(SQP)方法、功能函数度量法(PMA)/可靠度指标法(RIA)结合,提出协调器机构可靠性优化设计方法。研究结果表明,在协调交弹可靠度满足要求的情况下大幅提高了某协调器的协调效率,也验证了所提方法的有效性和工程价值。

高速列车转向架动力学设计指标分解冲突博弈协调方法

为解决传统的高速列车动力学性能多目标优化方法缺乏考虑设计指标之间的相互作用且主观性强、可解释性差、效率低等问题,提出一种基于博弈论的高速列车转向架动力学设计指标分解协调方法。首先,基于灵敏度分析结果建立7个动力学性能设计指标与13个转向架设计参数之间的分解映射,分析了动力学设计指标分解中的冲突关系并提取了冲突要素;然后,将互相冲突的动力学设计指标的分解协调转化为一个博弈过程,确定博弈中的决策结构,构建了博弈主体的效用函数并建立冲突性能的主从博弈协调模型;其次,设计一种基于遗传算法和二次规划联合的Nash均衡求解算法,以Nash均衡作为设计指标分解结果;最后,以高速列车稳定性和曲线通过性能的博弈协调为例验证了博弈协调模型与求解方法的可行性和有效性。研究结果表明:该方法不依赖于人工设置即可快速得到与高速列车实际设计参数相近的结果,并且在该结果下临界速度、脱轨系数、轮重减载率等指标均满足要求。引入博弈论进行动力学性能多目标优化不仅可获得直线稳定性和曲线通过安全性相对均衡的动力学性能,还减少了设计迭代次数,提高了设计效率,且所求取的是数学意义上的Nash均衡,极大地降低了主观性。研究成果可为高速列车悬挂系统设计和动力学性能协调优化提供参考。

新型配合物点火药设计与表征

为探索新型点火药,以满足武器装备更高的需求,以3,5-二硝基苯甲酸根(DNBA)为阴离子,1-烯丙基咪唑(AIM)为配体,过渡金属Mn、Co、Cu为中心离子,合成了3种新型含能配合物燃料,对其晶体结构、热分解特性、燃烧热和机械感度进行了测试;基于此,设计并制备了3种点火药,对其燃烧热、线燃烧速率、输出压力、点火能力和感度进行了测试。结果表明:3种新型含能配合物燃料的热分解温度处于272.93~427.85℃范围,燃烧热处于16.69~18.91 kJ·g^(-1)范围,对机械刺激不敏感;3种点火药的燃烧热处于3.88~4.71 kJ·g^(-1)范围,线燃烧速率处于153.28~187.33 mm·s^(-1)范围,输出压力处于4.36~4.62 MPa范围,撞击感度处于28~32 J,摩擦感度处于216~252 N。

构建高职院校鞋类设计专业“协同·适切”模式——以温州地区为例

在国家产业链从“中国制造”转型升级为“中国创造”的背景下,国内鞋类设计行业的需求逐渐加大,同时对鞋类设计专业人才的培养也提出了新的要求。这就需要相关高等职业院校在新时代经济高质量发展的大局中找准定位,完善高质量办学机制,落实高质量发展要求。本文聚焦温州地区制鞋业的发展现状,以温州地区高等职业院校鞋类设计专业为研究对象,从产、学、研入手,通过企业和学校合作办学模式的探索与创新,希望摆脱高职院校技能培养迟缓于市场需求的困窘。同时,依据企业反馈实况和总结实践经验,初步探讨高职院校鞋类设计专业“协同·适切”模式的新路径,希望能够建立校企命运共同体,以弥补校内实践培训的不足,提高教学质量,最终引领专业发展。

多换流器直流系统的虚拟惯性评估与控制参数协调设计

针对基于类虚拟同步发电机(AVSG)的多换流器直流系统遇到的非预期虚拟惯性问题,提出了一种多换流器直流系统虚拟惯性通用分析方法,有效修正了系统级等效AVSG外特性。首先,将多个AVSG控制回路等效为一个等值AVSG控制回路,建立了直流系统的等值单台AVSG模型。其次,提出了一种系统级虚拟惯性评估方法,从等值单台AVSG模型的输出阻抗频域响应特性角度对系统级虚拟惯性进行评估。然后,讨论了电压比例-积分(PI)控制参数对虚拟惯性特性的影响,并开展了电压PI控制参数和虚拟惯性系数间的协调设计。最后,在PLECS仿真软件及RT-BOX硬件在环实验平台上搭建了多换流器直流系统的开关模型,通过多种实验工况验证了等值单台AVSG模型和控制参数协调设计的有效性和可行性。

基于复眼混光的改善色品均匀性的LED模组

本文针对目前单颗LED的出射光颜色均匀性差的问题,提出了使用反光杯与复眼透镜阵列组合进行匀光的方法,以此得到了一种二次光源模组。通过仿真模拟实验表明该光源模组在出射面上的色品均匀性显著提高,基于此LED模组开发的LED灯具在一定距离的被照面上色品均匀性也将相应大幅提高。

剧院建筑装饰设计在施工阶段的管理实践

依托某剧场建筑工程项目装饰设计在施工阶段的管理开展研究,回顾总结了剧场建筑工程项目施工阶段的装饰设计管理实践,阐明了剧场建筑施工阶段装饰设计与实践相结合的有效管理方法和流程,以解决类似项目中需要综合考虑的效果、成本、工期、质量这四大项目目标之间的互相矛盾,为施工阶段前中后期的设计管理取舍等具体问题提供了参考。

信息收集中无人机节能轨迹设计与资源优化

为优化无线传感器网络(wireless sensor networks,WSN)中无人机(unmanned aerial vehicle,UAV)辅助信息收集系统的能量消耗,在综合考虑无人机飞行能耗和传感器节点上行数据传输能耗的基础上,提出了一种考虑链路间干扰的无人机轨迹和传感器功率分配联合优化算法。首先,基于实际约束构建了系统能耗最小化问题模型;然后,针对多约束优化问题的非凸性特征,采用块坐标下降法(block coordinate descent,BCD)将系统能耗最小化问题分解为固定无人机轨迹下的功率分配和固定功率分配下的无人机轨迹优化两个子问题,根据子问题的数学特征,采用凸近似法将非凸问题转化成可以求解的近似凸优化问题,通过对两个子问题的交替迭代优化,得到原非凸问题的近似次优解;最后,通过仿真实验验证了所提算法的可行性和有效性。结果表明:所提算法最大可使系统能量消耗降低22%,明显优于对比算法;且随着传感器节点数量的增加,所提算法的优势更加明显。研究结果为WSN中的信息收集提供了一种系统能耗优化思路,即在有限提高无人机飞行能耗的基础上,有效降低系统的能量消耗。