共查询到20条相似文献，搜索用时 177 毫秒
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绥中发电有限责任公司2期扩建工程2×1000 MW机组分散控制系统(DCS)采用西门子公司的SPPA-T3000分散控制系统。本文根据SPPA-T3000分散控制系统在绥电2期2×1000MW机组在调试和运行期间出现的问题及对策进行了总结和归纳,对其它使用SPPA-T3000分散控制系统的用户有一定的借鉴意义。 相似文献
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灰色层次分析法（GAHP）是一种改进的评估武器装备效能的方法,它相对于目前广泛应用的层次分析法,解决了当所需信息不明确时,评估专家无法给出一个确定的数字判断,以致影响评估结果的问题。文中介绍了灰色层次分析法的适用范围,给出了基本思想和评估模型,并由具体算例得出评估结果。评估结果表明,灰色层次分析法在确定分散信息、进行优劣排序、全面考虑因素等方面有很多优点。最后分析了该方法的局限性。 相似文献
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分散控制系统作为发电企业的神经中枢,其安全、可靠、稳定的运行起着举足轻重的作用,如果发生问题会造成严重的后果。通过对TCS3000分散控制系统使用,阐述了TCS3000分散控制系统典型故障,提高了工作人员的应急处理能力,有效的减少因分散控制系统故障造成机组非停事故。 相似文献
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本文根据股票投资的风险类型、风险与收益的关系、衡量股价波动的指标,结合国外证券市场各种投资对象的一般风险水平,研究了评估一种投资组合风险水平的实用方法;为降低股票投资风险,提出了根据投资者承受风险能力选择合适投资组合、分散投资普通股和根据股市兴衰变更投资方案的股票投资基本策略。 相似文献
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科技评估方案是科技评估活动中一个关键环节。对如何编制科学、完整、有针对性的评估方案进行了较为深入地研究，编制科技评估方案应明确评估目的的评估对象，准确地进行评估需求分析，科学地设计评估框架，确定信息的采集范围和方法、选择好评估人员等。对独立、客观、公正和科学地开展科技评估提供了可行的操作方法和原则。 相似文献
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Min-Rong Chen Guo-Qiang Zeng Xiao-Qing Xie 《Journal of The Franklin Institute》2018,355(17):8266-8295
How to design a set of optimal distributed load frequency controllers for a multi-area interconnected power system is an important but still challenging issue in the field of modern electric power systems. This paper presents an adaptive population extremal optimization-based extended distributed model predictive load frequency control method called PEO-EDMPC for a multi-area interconnected power system. The key idea behind the proposed method is formulating the dynamic load frequency control issue of each area power system as an extended distributed discrete-time state-space model based on an extended state vector, obtaining a distributed dynamic extended predictive model, and rolling optimization of real-time control output signal by adopting an adaptive population extremal optimization algorithm, where the fitness is evaluated by the weighted sum of square predicted errors and square future control values. The superiority of the proposed PEO-EDMPC method to a traditional distributed model predictive control method, a population extremal optimization-based distributed proportional-integral control algorithm and a traditional distributed integral control method is demonstrated by the simulation studies on two-area and three-area interconnected power systems in cases of normal, perturbed system parameters and dynamical load disturbances. 相似文献
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海岛可持续发展理论及其评价研究 总被引：2，自引：1，他引：1
本文以可持续发展的基本理论为指导,结合海岛特征,从生存指标、环境状况、社会发展、智力评价四个层面,建立海岛可持续发展评价系统,将长海县、长岛县等12个海岛县作为研究对象,以2002年为评价的基准年,对12个海岛县2002年-2008年间的可持续发展综合能力进行对比研究分析,评价海岛县可持续发展的环境、社会经济状态和进程,结论显示：①12海岛县基本处于可持续发展较弱或中等水平;②12海岛县可持续发展状态格局分为3个层次;③人才、智力支持系统仍然是困扰海岛发展的难题;④海岛可持续发展未来格局将发生重大变化。 相似文献
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CAN总线即控制器局域网总线，特别适合于小型分布式测控系统。本文所述的微机光照控制系统将微机监控技术和现场总线控制技术相结合，构成了一种全分散式微机光照控制系统。该系统的功能强，投资少，可靠性高，便于扩展，有着广阔的应用前景。 相似文献
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Ahmadreza Argha Li Li Steven W. Su Hung Nguyen 《Journal of The Franklin Institute》2018,355(14):6191-6214
This paper proposes a framework for the design of sparsely distributed output feedback discrete-time sliding mode control (ODSMC) for interconnected systems. The major target here is to develop an observer based discrete-time sliding mode controller employing a sparsely distributed control network structure in which local controllers exploit some other sub-systems’ information as well as its own local information. As the local controllers/observers have access to some other sub-systems’ states, the control performance will be improved and the applicability region will be widened compared to the decentralised structure. As the first step, a stability condition is derived for the overall closed-loop system obtained from applying ODSMC to the underlying interconnected system, by assuming a priori known structure for the control/observer network. The developed LMI based controller design scheme provides the possibility to employ different information patterns such as fully distributed, sparsely distributed and decentralised patterns. In the second step, we propose a methodology to identify a sparse control/observer network structure with the least possible number of communication links that satisfies the stability condition given in the first step. The boundedness of the obtained overall closed-loop system is analysed and a bound is derived for the augmented system state which includes the closed-loop system state and the switching function. 相似文献
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This paper considers the distributed tracking control problem for linear multi-agent systems with disturbances and a leader whose control input is nonzero and not available to any follower. Based on the relative output measurements of neighboring agents, a novel distributed observer-based tracking protocol is proposed, where the distributed intermediate estimators are constructed to estimate the leader’s unknown control input and the states of the tracking error system simultaneously, then a distributed tracking protocol is designed based on the derived estimates. It is proved that the states of the tracking error system are uniformly ultimately bounded and an explicit tracking error bound is obtained. A simulation example of aircrafts verifies the effectiveness of the proposed method. 相似文献
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文章从推动分布式风能利用的意义出发,分析了世界范围分布式风能利用的发展现状和政策机制,对比讨论了我国分布式风能利用的现状和相关政策,说明了我国当前存在的问题及障碍。重点分析并提出了我国分布式风能发展的前景与发展路线图,指出未来将在分布式风电机组及其关键部件、分布式风电场开发、分布式风能利用与其他可再生能源互补综合利用等方面开展基础理论研究、高技术研发与创新、示范应用及产业化推广,进一步提升自主创新能力。分析说明了分布式风能利用技术创新的需求,提出了政策保障措施的建议。通过技术、政策、市场机制等多方面的协同创新,推动包括分布式风能在内的可再生能源在我国绿色低碳能源战略实施及生态文明建设过程中更好地发挥作用。 相似文献
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Liguo Qin Xiao He Rui Yan Ruiliang Deng Donghua Zhou 《Journal of The Franklin Institute》2019,356(2):791-818
In the paper, a distributed sensor fault detection and isolation scheme is presented for a network of second-order integrators. A new distributed control law is developed to achieve formation of the system. By using the integration information of distributed formation errors, the control law improves the robustness of the formation. A distributed observer is then designed in each vehicle based on the closed-loop dynamic model of the vehicle. Each vehicle updates the states of the distributed observer by employing the measurements of itself and the transmitted state estimations from its neighbors. Based on the distributed observer, a distributed fault detection observer and a distributed fault isolation observer are designed. The presented distributed fault detection observer in each vehicle is able to be sensitive to the faults of all vehicles in the system. By using the distributed fault isolation observers, each vehicle is able to be sensitive to the faults of itself, its neighbors and its neighbors’ neighbors and to be robust to the faults of other vehicles. Although the fault isolation of the proposed scheme is simple, computation loads of the scheme are lower than the current ones since only the model of the individual vehicle is used. Finally, the effectiveness of the control law and the fault diagnosis scheme is demonstrated by simulations and real-time experiments carried out based on a formation of three quadrotors. 相似文献
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《Journal of The Franklin Institute》2019,356(17):10296-10314
This paper investigates the problem of distributed event-triggered sliding mode control (SMC) for switched systems with limited communication capacity. Moreover, the system output and switching signals are both considered to be sampled by distributed digital sensors, which may cause control delay and asynchronous switching. First of all, a novel distributed event-triggering scheme for switched systems is proposed to reduce bandwidth requirements. Then, a state observer is designed to estimate the system state via sampled system output with transmission delay. Based on the observed system state, a switched SMC law and corresponding switching law are designed to guarantee the exponential stability of the closed-loop system with H∞ performance. Finally, an application example is given to illustrate the effectiveness of the proposed method. 相似文献