Simulation of Underground Reservoir Stability of Pumped Storage Power Station Based on Fluid-Structure Coupling

Based on global initiatives such as the clean energy transition and the development of renewable energy,the pumped storage power station has become a new and significant way of energy storage and regulation,and its construction environment is more complex than that of a traditional reservoir.In particular,the stability of the rock strata in the underground reservoirs is affected by the seepage pressure and rock stress,which presents some challenges in achieving engineering safety and stability.Using the advantages of the numerical simulation method in dealing deal with nonlinear problems in engineering stability,in this study,the stability of the underground reservoir of the Shidangshan(SDS)pumped storage power station was numerically calculated and quantitatively analyzed based on fluid-structure coupling theory,providing an important reference for the safe operation and management of the underground reservoir.First,using the COMSOL software,a suitablemechanicalmodel was created in accordance with the geological structure and project characteristics of the underground reservoir.Next,the characteristics of the stress field,displacement field,and seepage field after excavation of the underground reservoir were simulated in light of the seepage effect of groundwater on the nearby rock of the underground reservoir.Finally,based on the construction specifications and Molar-Coulomb criterion,a thorough evaluation of the stability of the underground reservoir was performed through simulation of the filling and discharge conditions and anti-seepage strengthening measures.The findings demonstrate that the numerical simulation results have a certain level of reliability and are in accordance with the stress measured in the project area.The underground reservoir excavation resulted in a maximum displacement value of the rock mass around the caverns of 3.56 mm in a typical section,and the safety coefficient of the parts,as determined using the Molar-Coulomb criterion,was higher than 1,indicating that the project as a whole is in a stable state.

Prospect of new pumped-storage power station

In this paper, a new type of pumped-storage power station with faster response speed, wider regulation range, and better stability is proposed. The operational flexible of the traditional pumped-storage power station can be improved with variable-speed pumped-storage tech no logy. Combined with chemical en ergy storage, the failure to achieve sec on d-order response speed and the insufficient safety and reliability of pumped-storage power units could be solved. With the better solar en ergy and site resources, the in teg rated performance can be improved by an optical storage system in stalled in future pumped-storage stations. Through the characteristics analysis of the new type of pumped-storage power station, three types of optimal station locations are proposed, namely, the load concentration area, new energy concentration area, and ultrahigh- voltage direct current receiver area. Taking the new pumped-storage power station as an example, the advantages of multi-energy cooperation and joint operation are analyzed. It can be predicted that the frequency and load regulation of the power grid will be more flexible, and the service capacity to the main power grid will be much stronger in the future.

Study on integrated development and hybrid operation mode of nuclear power plant and pumped-storage power station

The nuclear power plant is suitable for base-load operation, while the pumped-storage unit mainly gives play to capacity benefit in the electric power system;hence, the integrated development and hybrid operation mode of the two can better meet the needs of the electric power system. This article first presents an analysis of the necessity and superiority of such mode, then explains its meaning and analyzes the working routes. Finally, it proposes the business modes as follows: low price pumping water electricity plus nuclear power in the near term;nuclear power shifted to pumped storage power participating in market competition in the middle term;and, in the long term, nuclear power shifted to pumped storage power as primary and serving as an electric power system when needed.

Equivalent Substitution Based Method for Calculation of Best Installed Capacity of Pumped Storage Power Station

This paper proposes a novel method to calculate the best installed capacity of pumped storage power station. First, we choose the day with maximum load as the typical day for every month and simulate the system running in two cases of whether the pumped storage power station is put into operation. The difference of the total coal consumption between the two cases is the peak load shifting benefit. Furthermore, we build load model and power generation model to calculate the benefit of emergency use and frequency modulation, which are the major projects of dynamic benefits. At last, on the premise of ensuring the system requirements, the developed method employs the maximum benefit of the unit capacity as the objective function to get the best installed capacity of pumped storage power station by simulations. Tests on a provincial power grid have shown that the developed method which combines of load characteristics, electric structure and other factors can get the best installed capacity of pumped storage power station easily and has a certain guiding significance for the planning and construction of the pumped storage power station.

Optimal Dispatching Model Considering the Pumped Sto-rage Power Plant in Hunan

This paper made a research on the Intelligent Optimization Operating Modeling of Pumped Storage Power Station in Hunan Power Grid. First it introduces the characteristics of Hunan power grid and analysis the practical requirement of dispatching. Then it brings forward the intelligent optimization model and set up running model for pumped storage power station of Hei Mi-feng. At last, it introduces the application of pumped storage power station in Hunan power grid and proves the effectiveness of the optimization models.

Decision-making Method for Pumped Storage Power Stations in the Electricity Energy and Frequency Regulation Markets

With the establishment of “carbon peaking and carbon neutrality” goals in China, along with the development of new power systems and ongoing electricity market reforms, pumped-storage power stations (PSPSs) will increasingly play a significant role in power systems. Therefore, this study focuses on trading and bidding strategies for PSPSs in the electricity market. Firstly, a comprehensive framework for PSPSs participating in the electricity energy and frequency regulation (FR) ancillary service market is proposed. Subsequently, a two-layer trading model is developed to achieve joint clearing in the energy and frequency regulation markets. The upper-layer model aims to maximize the revenue of the power station by optimizing the bidding strategies using a Q-learning algorithm. The lower-layer model minimized the total electricity purchasing cost of the system. Finally, the proposed bi-level trading model is validated by studying an actual case in which data are obtained from a provincial power system in China. The results indicate that through this decision-making method, PSPSs can achieve higher economic revenue in the market, which will provide a reference for the planning and operation of PSPSs.

基于平抑风光波动的矿坑抽水蓄能电站出力与机组特性研究

由于我国能源结构的调整,现有抽水蓄能电站装机规模无法满足黄河流域的能源结构转型以及风、光资源大规模消纳的需求,同时由于采矿工作的结束,产生了大量废弃矿坑。以鄂尔多斯附近的废弃矿坑为研究对象,借助鄂尔多斯域内的黄河水资源,结合抽水蓄能电站的建设条件,选出4对符合抽水蓄能电站建设要求的矿坑。对待建抽水蓄能电站附近的风光资源数据进行采集,借助Meteonorm、Matlab以及Simulink等软件进行出力模拟,并对出力特性进行分析,证实抽水蓄能电站是风电、光伏发电的良好补充资源。由于水泵水轮机的国内外制造商没有成形的型谱系列,所以分别从抽水蓄能电站水轮机选型要点、抽水蓄能电站水轮机主要特征参数的选择、矿坑抽水蓄能电站水轮机选型实例3个角度对不同矿坑特性下的抽水蓄能机组进行合理选型。该研究对我国黄河流域抽水蓄能电站的建设、后续废弃矿坑的利用以及矿坑抽水蓄能机组的选型具有指导意义。

大跨度高埋深地下洞室群开挖后涌水量预测

大型地下洞室群开挖后的涌水量预测对于地下工程的安全施工与运行具有重要意义。为预测地下洞室群开挖后的涌水量,以提供排水防渗设计参考,以新疆某抽水蓄能电站大型地下厂房洞室群为研究对象,分别从地下水活动特征、钻孔压水试验成果、岩体结构面发育情况等方面分析坝址区岩体的渗透特性。为体现预测结果的可靠性,分别采用地下水动力学法和数值分析法对地下洞室群开挖后的地下水渗流场变化和正常涌水量进行分析和预测。研究结果表明:地下洞室群开挖后具有明显的渗漏和排水作用,主厂房承担了洞室群渗流的大部分涌水量,最易发生渗透破坏变形的部位位于洞室开挖线边角处。地下水动力学法和数值分析法预测的洞室群开挖后的正常涌水量分别为7442.88 m^(3)/d和7218.32 m^(3)/d,结果误差为3.1%,两者预测结果吻合较好。基于工程安全角度考虑,选取地下水动力学法佐藤邦明经验式计算结果7442.88 m^(3)/d作为该抽水蓄能电站地下厂房洞室群开挖后正常涌水量预测值。分析成果可为大型地下洞室群开挖施工及排水防渗设计提供参考依据。

陕西镇安抽水蓄能电站地下厂房动力响应分析

抽水蓄能电站水头高,地下厂房结构振动问题突出,启停频繁,地下厂房动力响应分析作为厂房设计研究中的重点问题受到更多关注。以陕西镇安抽水蓄能电站为例,利用ANSYS有限元软件建立地下厂房实体模型,通过进行厂房自振特性及共振分析和对机组荷载及压力脉动作用下地下厂房动力响应进行研究,分析了不同工况下厂房整体、局部结构自振特性和动力响应。结果表明:镇安抽水蓄能电站厂房抗振设计基本合理,楼梯和立柱作为厂房薄弱环节需重点关注;电站在低水头运行时,厂房结构动力响应明显增大,在实际运行中应合理调度,尽量减少低水头运行时长。研究结果可为类似工程设计提供参考。

面向抽水蓄能电站的巡检机器人关键技术研究

针对抽水蓄能电站中混凝土墙体现场检测难度大且传统巡检方式效率低的问题,提出了一种基于深度学习的裂缝检测系统。通过FCN网络和CNN网络的相似性匹配,可以有效地判断混凝土裂缝的位置、尺寸及深度等信息,实现对裂缝的自动检测。同时,设计了巡检机器人硬件构架与软件系统,实现巡检路线自主规划、自主导航和检测区域的自主识别等功能。基于CrackForest数据集对所提检测模型的性能进行了验证测试,结果表明所提模型的识别精度可达87.74%,平均误差仅为0.45,综合性能良好。

蝶阀在抽水蓄能电站尾水系统中的应用研究

为简化抽水蓄能电站尾水系统金属结构设备布置,提高电站防水淹厂房能力,提出了采用蝶阀作为尾水系统断流设备,并对其进行了可行性分析,同时还对蝶阀与事故闸门方案进行了对比研究。结果表明,尾水系统断流设备采用蝶阀方案切实可行,可提高防水淹厂房事故扩大的能力,简化设备的安装及减少土建施工。选定规格参数的蝶阀方案可降低建设成本,提高经济效益。研究结果可为类似工程的防水淹厂房事故扩大以及设备布置提供新的思路和技术参考。

抽水蓄能电站地下厂房围岩稳定性监测与分析

鉴于围岩稳定性监测与分析在抽水蓄能电站地下厂房施工过程中扮演着重要角色,提出一种基于自优化变分模态分解(SoVMD)和循环重构Transformer(RRTransformer)的混合分析模型。首先,设计合理的监测方案,采集能够有效表征围岩稳定性的岩体变形位移数据;其次,考虑变形位移序列的非线性与波动性特征,利用SoVMD对其进行分解,提取多尺度频率分量(MsFCs);最后,基于滑动建模机制,以MsFCs作为RRTransformer的训练输入,经参数优化和模型重构得到最优的变形预测分析结果。选取国内某抽蓄电站地下厂房围岩稳定性分析过程为案例,结果表明所设计的监测方案可有效获取岩体变形位移数据,且所提预测分析模型具有优异的性能,预测分析结果对地下厂房围岩的安全管理具有重要意义。

基于区块链的抽水蓄能电站发电电动机运行监测数据存储方法

针对监测抽水蓄能电站发电电动机运行数据存在冗余问题,致使存储数据延迟时间长,提出基于区块链的抽水蓄能电站发电电动机运行监测数据存储方法,通过存储数据身份验证维护存储数据安全。数据层运用数据采集平台获取抽水蓄能电站发电电动机运行监测数据,采用变更数据捕获(change data capture,CDC)算法消除采集数据冗余,并通过发送终端将消冗后数据传输至分布式存储层;分布式存储层的区块链按时间戳的顺序确定数据区块的存储顺序,通过身份注册验证待上传的数据身份;分布式存储数据库采用HBase技术对通过身份验证数据进行多维排序映射存储;通过应用层客户端展示存储结果并提供数据共享服务。实验结果表明:该方法的数据消冗效果较好,可实现电动机运行监测数据存储,且存储数据延迟时间短,上传数据时的身份注册开销比较稳定,可保障存储数据安全。

面向光伏出力不确定性的混蓄电站运行方式研究

为探究混合式抽水蓄能电站在不同光伏出力场景下的水光混蓄互补运行方式,构建基于生成式对抗网络(GAN)的光伏出力场景生成模型,以表征光伏出力的不确定性,并构建以源荷差异最小、系统发电量最大及梯级蓄能增量最大为目标的互补调度模型。采用Fibonacci-PSO算法对模型进行优化求解。结果表明:相比无混蓄电站运行模式,混合式抽水蓄能电站能够更好地调整系统出力与电网负荷需求相匹配,并在丰水期利用水电弃水进行发电,增加系统发电量,提高资源利用率;混蓄电站在丰水期内主要进行夜间发电,而在平水期与枯水期则进行夜间发电和日间抽水;其运行方式在丰水期内提升了4.4%~12.4%的发电量,并在平水期和枯水期通过抽水减少系统出力与电网负荷的差异,使得互补发电系统能够精准响应负荷需求。研究证明,所提出的方法对提升清洁能源消纳能力具有重要意义。

安徽石台抽蓄营地建筑设计的地域性表达研究

为探讨抽蓄营地规划建筑设计中的地域性表达,以安徽石台抽水蓄能电站现场管理营地为例,从项目背景、设计思路及设计策略3个角度,对抽蓄营地设计的地域性表达进行了深入剖析,结合皖南建筑特征进行思考和再创新,详细介绍了地域性表达的概念、总体布局、建筑造型、建筑材料等在设计中的实践运用。总结出以场地条件为突破口,融合地域特有文化属性,运用现代建筑设计手法,打造具有地方特色且符合现代功能需求的抽蓄营地设计思路。研究成果可为类似抽蓄营地建筑设计提供参考。

抽水蓄能电站交通道路设计阶段节约用地措施

随着国家逐渐完善抽水蓄能电站建设用地政策,如何设计电站交通道路以满足节约用地要求是今后一段时间内亟须解决的问题。对此,在分析交通道路用地特点的基础上,对道路等级、路线纵坡、横断面形式以及桥隧占比等节地措施进行探讨,并运用到实际工程,以期为类似工程项目提供参考。

抽水蓄能电站500 kV变压器常见问题分析及处理

以溧阳抽水蓄能电站500 kV变压器为研究对象,介绍了变压器的参数及结构特点,分析并处理了一些变压器常发问题。对后续类似问题的分析和处理具有指导意义。

抽蓄电站混凝土模板设计及其施工要点

抽水蓄能电站一般包括水库大坝与地下引水发电两大系统。在混凝土阶段,混凝土内部实体质量不仅要满足要求,而且构筑物的体型和外观质量都是施工控制的重点。以浙江缙蓄电站为例,根据不同施工部位体型的特点,对混凝土主要模板(工具式模板类)从设计思路、重点及施工要点的两个方面进行了比较详细的简述;同时,也介绍了特殊部位的满堂架支撑模板的受力特点及施工要点。

基于BIM技术的黄龙抽水蓄能电站机电管线综合安装优化方法研究

针对黄龙抽水蓄能电站机电管线系统安装过程中存在的诸多挑战,提出了一种基于BIM技术的综合安装优化方法,解决了碰撞管线自动调整的问题,实现了机电管线系统的综合安装优化。

抽水蓄能电站与引调水工程结合实施的探讨

在构建以风、光等新能源为主体的新型电力系统背景下,探索抽水蓄能电站协同实施引调水工程,兼顾电力系统与水资源配置要求,可充分发挥工程综合效益,推进电力与水网建设协同发展。采用“电水统筹”开发模式,可一定程度上降低“抽水蓄能+引调水”工程总投资、节约建设用地,减少对生态环境的影响。文章归纳了现有“电水统筹”项目的主要开发方式,探讨了项目开发需要关注的重点及应对,包括合理的工程建设规模、充足的水源条件、适宜的消落深度、可控的泥沙含量等,合理分摊工程投资、控制提水成本,统筹协调工程运行调度,以期为电力发展与水网建设提供参考。