基于微分进化算法的水火电短期优化调度的研究

在电力市场机制不断更迭情况下,针对水电发展趋于完善的过渡时期,充分考虑当前环境下水火电协调的新内涵,以电网经营企业利益为核心,提出了适合当前阶段,含阶梯水电站的水火电混合系统发电侧短期购电费用最低的联合调度模型。初次在国内引入微分进化算法到电力系统短期优化调度,以使水火电的出力分配达到最优。实际算例的计算结果表明,该算法能够较好地实现该模型下的经济调度。     

基于多模速率方程电路建模的太赫兹量子级联激光器稳态性能及输出光谱特性分析

通过改进的三能级多模态速率方程,运用电路建模 方法,建立了太赫兹(THz)量子级联激光器(QCL)的一种等效电路模型。由于基于多模 态效应进行建模,所建模型能够有效表 征多模态效应对THz QCL光电性能的影响。模型中,涉及的非辐射散射时间、自激发射弛豫 时间以及电子逃 逸时间均根据器件有源层结构参数通过自洽数值求解获得。采用所建模型,可运用通用电路 仿真工具实现对 THz QCL光电特性的模拟分析,克服了数值分析方法计算复杂、模拟时间长的缺点。运用电 路仿 真工具PSPICE对2.47THz QCL的稳态特性和输出光谱特性进行了模拟 分析,并讨论了温度变化对器 件阈值电流、输出光功率以及输出频谱的影响,分析结果与已报道的理论和实验结果一致 ,验证了本文方法的适用性和准确性。     

水利水电工程网络进度计划标准化系统研发

水利水电工程网络进度计划是施工组织设计的重要组成部分。针对目前大多数网络进度计划软件在进度计划生成、分析等方面提供的功能有限,使得网络进度计划编制费时、费力,效率不高,且标准化程度不高等问题,本文在分析了水利水电工程网络进度计划标准化内涵的基础上,对网络进度计划标准化的基本内容进行了研究;在此基础上设计开发了水利水电工程网络进度计划标准化系统,详细介绍了网络进度计划辅助生成、分析、评价与审阅,以及成果输出等功能。该系统不仅界面友好、直观可视化,而且提供了强大的计算及优化功能,大大提高了工程人员网络进度计划编制的效率和质量,为网络进度计划快速分析和优化提供了一种新的思路和手段。     

基于级联光栅温度补偿的溶液浓度测量研究

为解决长周期光纤光栅(LPG)折射率测量时的温度交叉敏感问题,利用布喇格光纤光栅(FBG)对环境折射率不敏感的特点,将其与长周期光纤光栅(LPG)级联,构成具有温度补偿的折射率传感方案。实验结果表明：随着温度的变化级联光栅的两个透射谐振波长都有线性变化,而改变溶液折射率时只有一个透射谐振波长改变。因此,可以利用级联光栅对折射率和温度双参量进行同时测量,补偿因温度变化产生的测量误差。     

水位自动监测系统的研究与设计

利用超声波技术设计了一种多从结构的水位自动监测系统,系统主要由数据中转站和水位数据采集终端两部分组成。水位采集终端通过超声波方式采集水位,将采集的水位数据通过无线传输给数据中转站,然后由数据中转站发送至远程终端。实验表明,系统能够实现水电站水位监测和数据传输功能,且系统具有传输数据精度高和无线传输及远程监控的能力。     

湖北利川某水电站混凝土大坝裂缝普查及处理工艺

水电站混凝土大坝局部裂缝是常见的混凝土缺陷之一。本文介绍了湖北利川某电站混凝土大坝裂缝的普查分类和针对不同类别裂缝的处理工艺,对于浅层裂缝采用水泥基渗透结晶型防水材料涂刷,对于不渗水或渗水量较小的裂缝采用环氧树脂灌浆+环氧胶泥涂刷,对于渗水量较大的裂缝采用聚氨酯灌浆+环氧胶泥涂刷。上述处理方法可为水工建筑物混凝土裂缝处理提供借鉴和参考。     

Limitations,challenges, and solution approaches in grid-connected renewable energy systems

In the modern world, only conventional energy resources cannot fulfil the growing energy demand. Electricity is a fundamental building block of a technological revolution. Today, most of the electricity demand is met by the burning of fossil fuels but at the cost of adverse environmental impact. In order to bridge the gap between electricity demand and supply, nonconventional and eco-friendly means of energy generation are considered. Renewable energy systems (RESs) offer an adequate solution to mitigate the challenges originated due to greenhouse gasses (GHG). However, they have an unpredictable power generation with specific site requirements. Grid integration of RESs may lead to new challenges related to power quality, reliability, power system stability, harmonics, subsynchronous oscillations (SSOs), power quality, and reactive power compensation. The integration with energy storage systems (ESSs) can reduce these complexities that arise due to the intermittent nature of RESs. In this paper, a comprehensive review of renewable energy sources has been presented. Application of ESSs in RESs and their development phase has been discussed. Role of ESSs in increasing lifetime, efficiency, and energy density of power system having RESs has been reviewed. Moreover, different techniques to solve the critical issues like low efficiency, harmonics, and inertia reduction in photovoltaic (PV) systems have been presented. Unlike most of the available review papers, this article also investigates the impact of FACTS technology in RESs-based power system using multitype flexible AC transmission system (FACTS) controllers. Three simulation models have been developed in MATLAB/Simulink. The results show that FACTS devices help to maintain the stability of RESs integrated power system. This review paper is believed to be of potential benefit for researchers from both the industry and academia to develop better understanding of challenges and solution techniques for REs-based power systems and future research dimensions in this area.     

An improved partheno genetic algorithm for multi-objective economic dispatch in cascaded hydropower systems

The multi-objective economic dispatch (MOED) problem in cascaded hydropower systems is a complicated nonlinear optimization problem with a group of complex constraints. In this paper, an improved partheno genetic algorithm (IPGA) for resolving the MOED problem in hydropower energy systems based on the non-uniform mutation operator is proposed. In the new algorithm, the crossover operator is removed and only mutation operation is made, which makes it simpler than GA in the genetic operations and not generate invalid offspring during evolution. With the help of incorporating greedy selection idea into the non-uniform mutation operator, IPGA searches the solution space uniformly at the early stage and very locally at the later stage, which makes it avoid the random blind jumping and stay at the promising solution areas. Finally, the proposed algorithm is applied to a realistic hydropower energy system with two giant scale cascaded hydropower plants in China. Compared with other algorithms, the results obtained using IPGA verify its superiority in both efficiency and precision.     

水电施工远程视频诊断的无线网络规划与应用

为满足水利水电工程远程视频诊断的需求，提出一种适用于偏远山区的无线网络规划方案。介绍了网络规划中，查勘选址的原则，Mesh多频组网的覆盖方式，链路预算和仿真设备选型，以及通过调整天线高度、下倾角和方向角等手段对网络进行优化的方法。规划方案成功应用于乌东德水电站施工现场，现场骨干网络达到1.4Gbps，满足了后方对高清视频诊断的需求。相较于传统的有线网络、卫星通讯和3G通讯方式，该网络成本更低，建设便捷，更适于偏远山区。     

某河床式水电站溢流坝裂缝分析处理

混凝土坝裂缝的预防和控制是混凝土坝工程设计和施工的重点研究课题,每个工程混凝土裂缝发生的部位和数量各不相同,裂缝的成因也不尽相同,只有分析清楚裂缝的成因和危害才能采取相应的措施进行预防和解决.本文对某河床式水电站溢流坝闸墩和堰面裂缝的成因和危害进行了详细的分析,针对性地提出了裂缝处理方案和后续预防措施.电站溢流坝闸墩及堰面裂缝经处理后已有裂缝已封闭,后续混凝土浇筑未见新的裂缝产生,目前工程已安全运行十多年.