遗传算法在厂群规划中的应用

提出适用于区域范围内的污水处理厂厂群规划问题,遗传算法应用到该问题中进行有益尝试。在传统厂群规划模型基础上,提出改进的污水处理厂厂群规划模型,并构造了适合该模型的遗传算法。在GAOT(Genetic Algorithm Toolbox)的支持下,用Matlab程序编写了解决此问题的遗传算法,对模拟的实例进行了计算,结果证明,遗传算法应用于此类问题中是可行的。

妥善处理厂群矛盾是加强环境管理的一项重要任务

厂群矛盾,是指因环境污染而产生的工厂与城市居民、农民、学校以及其他工厂之间的矛盾和冲突。它是我国环境管理和环境保护法学中的一个专有名词。运用社会主义环境法规和环境管理手段,妥善地处理厂群矛盾,是我们各级政府环境主管部门应该引起高度重视的问题。因为它是党和政府密切联系群众,为民办实事、做好事的一个重要标志之一。及时处理因环境污染引起的来信、来访,是党和政府关心人民健康的具体体现,也是我们环保工作者贯彻环境保护法规,强化环境监督管理,保障人民合法环境权利不受侵犯的具体表现。是维护人民群众正常工作、学习、生活,保障人民安居乐业。

污水厂群应急联合调度——珠海香洲区污水系统规划案例

市政污水系统中单座污水处理厂流域内的管网、泵站等设施相对独立,普遍未建立应急状态下厂群间的联合调度体系,厂网系统效能未得到充分发挥。以珠海香洲区污水系统规划为例,分析应急状态下各污水处理厂的调度需求,评估污水处理厂的应急服务能力,通过优化调整污水干管及泵站等枢纽设施布局,提出污水工程规划中应急状态下污水处理厂群联合调度方案,以平衡事故水量,提升运行安全保障,减小事故水环境污染风险。

优化模型在污泥处理厂选址中的应用

在我国大中城市,污水处理厂的不断兴建使污泥处理问题应运而生。采用混合整数优化模型可以解决污泥处理厂的科学选址问题,达到科学布点、合理运输、节省投资费用的目的。在传统厂群规划模型的基础上将目标规划、周密的约束条件等融于其中,并采用对于线形规划和非线性规划问题适用的LINGO软件进行求解。根据东莞市拟建的36个污水处理厂污泥产生预测情况,对污泥处理厂的设置进行了分析预测,详细对比了建一个、两个、三个污泥处理厂的运输费用、投资费用、运行费用等,最终确定兴建两个规模均为800t/d的处理厂,其位置分别位于东莞市厚街镇和常平镇,为厂址选择和规模提供了科学依据和保障。

Research on Verification Method of Motor Startups in Nuclear Power Plants Based on Topology Recognition

There are many motors in operation or on standby in nuclear power plants,and the startup of group motors will have a great impact on the voltage of the emergency bus.At present,there is no special or inexpensive software to solve this problem,and the experience of engineers is not accurate enough.Therefore,this paper developed a method and system for the startup calculation of group motors in nuclear power plants and proposed an automatic generation method of circuit topology in nuclear power plants.Each component in the topology was given its unique number,and the component class could be constructed according to its type and upper and lower connections.The subordination and topology relationship of switches,buses,and motors could be quickly generated by the program according to the component class,and the simplified direct power flow algorithm was used to calculate the power flow for the startup of group motors according to the above relationship.Then,whether the bus voltage is in the safe range and whether the voltage exceeds the limit during the startup of the group motor could be judged.The practical example was used to verify the effectiveness of the method.Compared with other professional software,the method has high efficiency and low cost.

考虑电网安全校核的月度电力撮合交易算法

由于贵州电网存在网络约束,传统的月度集中撮合交易会影响电网的安全性,因此基于电力市场传统无约束集中撮合理论和流程,提出考虑电网安全校核的月度集中撮合交易算法,通过厂群电量约束来提升集中撮合交易的安全性和经济性。以2016年贵州电力交易的实际数据构造算例,生成有、无厂群电量约束的成交结果并进行对比分析,结果表明所提方法有利于建立平衡有序的电力市场机制。最后指出,非线性规划、电力电量折算是尚需解决的问题。

工厂建筑群建设房屋顶太阳能发电项目的探讨

随着社会经济的高速发展和传统能源的日益稀缺,开发新能源成为了当今时代的重要课题。太阳能因其良好的再生能力与丰富的储存量在新能源中占据了重要的地位。结合太阳能光伏发电的具体例子,分析了生物质发电厂光伏发电项目的经济可行性,提出了工厂利用厂房屋顶光伏发电的方法,为推广工厂屋顶光伏发电技术提供了有力依据。

Characteristics of microseismic b-value associated with rock mass large deformation in underground powerhouse caverns at different stress levels

Rock mass large deformation in underground powerhouse caverns has been a severe hazard in hydropower engineering in Southwest China.During the development of rock mass large deformation,a sequence of fractures was generated that can be monitored using microseismic(MS)monitoring techniques.Two MS monitoring systems were established in two typical underground powerhouse caverns featuring distinct geostress levels.The MS b-values associated with rock mass large deformation and their temporal variation are analysed.The results showed that the MS bvalue in course of rock mass deformation was less than 1.0 in the underground powerhouse caverns at a high stress level while larger than 1.5 at a low stress level.Prior to the rock mass deformation,the MS b-values derived from both the high-stress and low-stress underground powerhouse caverns show an incremental decrease over 10%within 10 d.The results contribute to understanding the fracturing characteristics of MS sources associated with rock mass large deformation and provide a reference for early warning of rock mass large deformation in underground powerhouse caverns.

Mechanical response and stability analysis of rock mass in high geostress underground powerhouse caverns subjected to excavation

To investigate the stability of rock mass in high geostress underground powerhouse caverns subjected to excavation,a microseismic(MS)monitoring system was established and the discrete element method(DEM)-based numerical simulation was carried out.The tempo-spatial damage characteristics of rock mass were analyzed.The evolution laws of MS source parameters during the formation of a rock collapse controlled by high geostress and geological structure were investigated.Additionally,a three-dimensional DEM model of the underground powerhouse caverns was built to reveal the deformation characteristics of rock mass.The results indicated that the MS events induced by excavation of high geostress underground powerhouse caverns occurred frequently.The large-stake crown of the main powerhouse was the main damage area.Prior to the rock collapse,the MS event count and accumulated energy release increased rapidly,while the apparent stress sharply increased and then decreased.The amount and proportion of shear and mixed MS events remarkably increased.The maximum displacement was generally located near the spandrel areas.The MS monitoring data and numerical simulation were in good agreement,which can provide significant references for damage evaluation and disaster forecasting in high geostress underground powerhouse caverns.

2016 Chinese guidelines for the management of dyslipidemia in adults

Abbreviations ACS： acute coronary syndrome ALT： alanine aminotransferase Apo： apolipoprotein ASCVD： atherosclerotic cardiovascular disease AST： aspartate aminotransferase

Micro-vibration response analysis and its application of electronic workshop raw land based on whale optimization algorithm

Environmental micro-vibration is one of the key factors impacting the running of electronic workshop.Low frequency micro-vibration has a significant influence on the normal operation of high precision machining and testing equipment,and even causes irreversible damage to the equipment.Micro-vibration testing and response analysis are important to guide the vibration isolation design and ensure the stable operation of various precision equipment in the workshop.Parameters of Davidenkov model are fitted based on whale swarm optimization algorithm,and its applicability is verified.At the same time,taking the testing project of an electronic workshop raw land as an example,the micro-vibration response is analyzed.The results show that the nonlinear constitutive model constructed by whale optimization algorithm can simulate the dynamic nonlinear behavior of soil under the action of micro-vibration better.Compared with the traditional equivalent linearization method,the nonlinear constitutive model based on the whale optimization algorithm has a smaller acceleration response value.It can effectively suppress the“virtual resonance effect”produced by the equivalent linearization method.

Accelerated Particle Swarm Optimization for Controlling Virtual Power Plant Consisting of Renewable Energy Sources

RES （renewable energy sources）, such as wind and photovoltaic power plants, suffer from their stochastic nature that is why their behavior on market is very delicate. In order to diversify risk, a concept of VPP （virtual power plant） has been developed. The VPP is composed of several RES, from which at least one of them is fully controllable. Because the production of noncontrollable RES can not be forecasted perfectly, therefore an optimal dispatch schedule within VPP is needed. To address this problem, an APSO （accelerated particle swarm optimization） is used to solve the constrained optimal dispatch problem within VPP. The experimental results show that the proposed optimization method provides high quality solutions while meeting constraints.