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.

计及深度调峰的风-光-水-火-抽蓄多能源联网系统优化调度研究

多种能源联网运行逐步成为未来电力系统发展的方向,多能源联网系统的优化调度是应对规模化新能源并网消纳的重要手段。文中建立了计及火电机组深度调峰成本的风-光-水-火-抽蓄联网系统成本模型和考虑调峰主动性的风-光-水-火-抽蓄联网系统日前优化调度模型。针对多能源耦合系统结构复杂的情况,提出了分层优化调度的模型求解策略。上层模型以净负荷波动最小为优化目标,得到等效负荷曲线;下层模型根据上层模型的调度结果,以调峰运行的经济性最优和新能源弃电率最低为目标函数,计及调峰主动性,求解考虑火电机组深度调峰煤耗特性的含新能源系统的经济调度问题。仿真算例表明所建模型实现了多能源联网系统的互补运行,提升了火电机组的深度调峰能力,降低新能源弃电率和系统运行成本。

NB/T 35009-2024修订内容解读及抽水蓄能电站标准化工作历程回顾

本文回顾了抽水蓄能电站选点规划标准化工作历程,从90年代选点规划工作范围逐步扩展,一批代表性站点规划落地,选点规划思想逐渐成熟,首版标准于2003年编制完成。到2009年全国范围抽水蓄能电站选点规划系统性开展,继22个省(区、市)完成选点工作,第二版标准修订完成,有效指导了实践工作。随着抽水蓄能电站选点规划的管理流程和技术路线不断成熟,选点规划已成为前期工作和开工建设的重要基础。双碳目标提出以来,抽水蓄能中长期发展规划为行业发展带来新机遇新挑战,第三版标准修订工作适时开展,区分功能定位、明确技术要求,积极响应了当前新能源和抽水蓄能行业高质量发展的要求。

基于组合赋权-云模型的抽蓄电站高质量发展评价体系

为科学评价生产期抽蓄电站高质量发展现状、把握电站发展的薄弱环节、明确建设期及新投运电站发展方向,根据抽蓄电站定位及高质量发展内涵,经过2轮筛选,构建了包含服务电力系统稳定运行、经济、绿色、创新、共享5个一级指标以及18个二级指标的评价指标体系;选用层次分析法–决策实验分析方法确定指标权重,运用云模型评价各电站高质量发展等级。最后,选取A抽蓄电站为算例验证评价体系适用性。评价结果显示,该电站服务电力系统稳定运行、绿色和共享3个指标表现均为良好,经济和创新指标表现为中等,与电站实际运行情况相符合。该验证结果表明,采用上述方法构建的评价指标体系有很好的适用性。

含废旧矿井抽蓄电站的源-荷-储协同控制调频研究

针对新能源在电网中渗透率不断提高导致系统调频容量和频率响应能力不足的问题,提出一种含废旧矿井抽蓄电站的源-荷-储协同控制调频方法。首先,建立了电解铝工业负荷、废旧矿井抽蓄电站和超级电容频率响应模型。然后,基于模型预测控制理论,以系统状态量和控制量的加权函数最小为目标,设计区域信息互动的分布式模型预测控制器,并提出含废旧矿井抽蓄电站的源-荷-储协同控制调频方法。最后,将分布式模型预测控制器应用在所提源-荷-储协同控制方法中,并在改进的IEEE标准两区域LFC模型中进行仿真。结果表明所提方法可以缩短频率恢复时间,减小最大频差值,改善系统调频动态性能。

句容抽蓄上水库筑坝料E-B模型分期反演参数对比分析

为预测句容抽蓄上水库坝体和库盆在竣工期和蓄水后产生的变形,利用施工期上库主坝和库盆的变形监测资料,对填筑料E-B模型参数进行分期反演。在此基础上,采用第三期反演参数,对竣工期和蓄水后的库盆变形特性进行预测和分析。研究表明,利用早期短时序坝体变形监测资料得到的模型反演参数偏大,随着坝体填筑高度的增加,采用后期长时序变形监测资料反演得到的模型参数逐渐减小并趋于真实值;在E-B模型中引入初始应力状态参数S0可以考虑现场压实坝料的超固结特性,S0越大,坝体变形越小,经历高强度碾压后的填筑料S0在0.40~0.55之间;基于第三期反演参数的库盆竣工期沉降计算结果与实测结果总体吻合较好。研究结果可用于指导工程实践。

基于FLO-2D的抽水蓄能电站泥石流模拟分析

针对新疆吐鲁番盆地东侧鄯善县泥石流灾害影响该地区工程建设与发展的问题,以新疆鄯善县抽水蓄能电站下库区泥石流为研究对象,运用FLO-2D数值模拟软件,对不同降雨频率下(P=1%,2%,5%)泥石流沟的发生过程进行模拟。结果表明:在降雨频率P=1%和P=2%的降水条件下,沟内泥石流将冲出淤积在拦沙坝附近,并侵占河道。以库区运行年限100 a计,库区淤积总量为21567 m^(3),对下库区库容产生一定的影响。

基于AJSO-NOGM(1,1)组合模型某抽水蓄能电站库岸边坡变形预测

水库边坡变形演变表现出明显的时效特性,基于灰色系统新信息优先理论,通过引入基于新型初始条件优化的等间距NOGM(1,1)模型来强化最新时效因素对水库边坡变形趋势的影响和修正作用,从而提高最新环境变量对边坡变形的影响比重,并采用人工水母搜索算法(Artificial Jellyfish Search Optimizer, AJSO)对相关模型参数进行智能寻优,构建了用于水库边坡变形预测的AJSO-NOGM(1,1)模型。算例分析表明,本文方法相比传统灰色系统GM(1,1)模型预测值与实测值具有更高的相关系数,并且均方根误差和平均绝对系数均优于传统GM(1,1)模型的,可以显著提高边坡变形预测精度和鲁棒性,较好地反映水库岩石边坡变形趋势。

建设项目对自然保护区生物多样性影响评价研究--以青海同德抽水蓄能电站项目为例

生物多样性是人类赖以生存的重要基础,建立自然保护区是保护生物多样性的重要举措,评价建设项目对自然保护区生物多样性的影响是环境影响评价的重要内容。本文以青海同德抽水蓄能电站项目为例,依据《区域生物多样性评价标准》(HJ 623—2011)和《自然保护区建设项目生物多样性影响评价技术规范》(LY∕T 2242—2014),采用生物多样性影响指数法评价青海同德抽水蓄能电站建设工程对三江源国家级自然保护区中铁—军功保护分区生物多样性的影响,结果表明:该保护分区生物多样性指数为28.06,生物多样性保护具有重要意义;青海同德抽水蓄能电站建设工程对该保护分区生物多样性影响指数为52.38,影响程度较小;通过采取相应的防范措施,工程建设造成的不利影响可在施工结束后缓解或消除。

考虑源-荷不确定的抽水蓄能电站容量鲁棒优化配置

针对风—光—火—抽蓄联合发电系统中抽水蓄能电站的容量配置问题,建立了联合发电系统经济运行模型,模型旨在最小化弃风弃光量、最小化系统发电成本及最小化抽水蓄能电站建设成本及运行成本。考虑系统新能源出力及负荷的不确定性,引入min—max—min结构的两阶段鲁棒优化模型,得到新能源出力及负荷最恶劣场景下系统的最小运行成本,根据运行成本最小确定抽水蓄能电站容量。利用某一市级电网实际数据,基于列与约束生成算法对模型进行求解,计算结果验证了模型和算法的有效性,为系统的规划建设及运行提供参考。

定-变速抽水蓄能机组调相-发电过渡过程动态特性研究

可变速抽水蓄能作为一种较新的机组形式,在参与电网调相调频、功率调节等方面相对传统定速机组具有独特优势。调相-发电过程作为抽水蓄能机组应对风光等间歇性可再生能源波动的典型过渡过程,对过流部件压力波动及机组运行稳定性有显著影响。目前抽水蓄能电站中广泛采用的一管多机布置形式存在水力干扰现象,一台机组的工况变化会影响其他机组的运行。同时,变速机组的引入会使机组展现出与传统机组不同的水力动态特性。为深入探究调相-发电过渡过程中不同机组布置形式下复杂管道系统的水力动态特性及相关稳定性问题,结合工程数据,基于特征线法和S函数等方法构建三种不同机组组合形式下一管双机抽水蓄能机组模型。针对不同机组布置形式,分别探究不同动作间隔下机组的蜗壳压力、尾水管压力及调压井流量等水力因素的动态特性及其对蓄能机组稳定性的影响。定量分析结果表明:在调相-发电工况下,工作水头及蜗壳压力先下降后上升,尾水压力、下游调压井水位及流量呈现正弦式衰减振荡;3种组合形式中定速-变速机组组合稳定性效果最佳,变速-变速组合的水力波动最大。本研究为定、变速组合的抽水蓄能电站安全稳定运行提供一定的理论依据。

风电-光伏-电制氢-抽蓄零碳电力系统短期生产模拟模型

为实现碳达峰碳中和目标,构建以新能源为主体、以能源供给清洁化和能源消费电气化为特征的新型电力系统迫在眉睫.考虑风力发电、光伏发电的间歇性和随机性,以及抽蓄电站、电制氢的储能特性和灵活性特点,基于随机规划理论提出一种风电-光伏-电制氢-抽蓄零碳电力系统短期生产模拟模型.在满足柔性氢负荷总量需求的基础上,以绿电上网电量最大为目标,对风电-光伏-电制氢-抽蓄零碳电力系统进行短期生产模拟,包括日前发电-制氢计划、备用容量、抽水蓄能-放水发电功率、弃风光等.以我国张北风电-光伏-电制氢-抽蓄零碳电力系统示范工程为例,设置多个运行情景对所提模型进行模拟仿真.仿真结果表明:该模型能够有效模拟系统在任意风光出力场景集下的绿电上网计划情况,柔性氢负荷、抽蓄电站能有效促进风光消纳,增加系统综合效益.

基于分时电价的光伏-光热-抽蓄联合并网优化调度

针对波动性光伏电站对电网调度问题产生的影响,建立了基于分时电价的光伏-光热-抽蓄联合并网优化调度模型。通过光热和抽蓄两种可调度性电源的合理配合,可有效提升光伏时空平移特性,进而增加火电机组出力稳定性。为提高求解速率,将所建模型分为新能源联合并网多目标优化调度和火电机组经济调度两个阶段,并采用CPLEX求解器进行求解。通过改进的IEEE 30节点算例表明,光伏-光热-抽蓄联合并网相比于光伏-光热、光伏-抽蓄联合并网具有更好的经济性、稳定性。

基于组合赋权-云模型的抽水蓄能电站绿色技术创新能力评价研究

抽水蓄能作为最经济高效的超大容量储能方式、最具大规模开发价值的电力调节系统,是推动能源绿色低碳转型和实现“双碳”目标的重要保障。而抽蓄电站技术创新与绿色发展能力是促进抽水蓄能可持续发展的关键。本文从投入与产出能力角度,构建抽水蓄能技术创新与绿色发展能力多层次指标评价体系;基于层次分析法与熵权法运用组合赋权确定指标权重;针对评价过程中的模糊性与随机性,基于云模型提出抽水蓄能电站绿色技术创新能力的评价模型;最后,以某抽水蓄能电站的实际数据验证了评价模型的有效性与适用性。

考虑可再生能源不确定性的风-光-储-蓄多时间尺度联合优化调度

提出一种计及可再生能源不确定性的风电、光伏、电化学储能和变速抽水蓄能电站多能互补协同的优化调度方法。考虑电化学储能和变速抽水蓄能电站的互补调节特性,建立风-光-储-蓄联合运行的多时间尺度调度架构。在日前调度阶段,考虑风电和光伏出力的相关性,生成基于生成式对抗网络和峰值密度聚类算法的日前风光联合出力典型场景,综合考虑风光出力的不确定性和抽水蓄能电站与电化学储能的容量特性,建立面向调峰需求的随机优化日前调度模型;在日内优化阶段,以最小化弃风弃光与电网备用电能为目标,构建变速抽水蓄能电站出力修正方法,制定电化学储能日内调度计划;在实时校正阶段,基于模型预测控制方法,以日内优化调度结果为参考,对电化学储能出力进行精确控制,最小化风光预测误差的影响。算例分析结果表明,所提方法可以有效减小电网负荷峰谷差,平抑风光联合出力波动,提升可再生能源消纳率。

基于消纳型抽水蓄能电站的风电-抽水蓄能联合运行特性分析

针对风电集群(Wind Power Cluster,WPC)与用于消纳的抽水蓄能电站(Pumped Storage Power Station,PSPS)联合运行缺乏统筹分析的问题,基于PSPS消纳风电不确定功率及能量的有功调节功能,分析了PSPS的工作原理、调节特性及功能特点,并对其运行机制进行改进建模,为风电-抽水蓄能联合发电系统的协同优化调度提供理论依据。最后对PSPS提升风电消纳能力的机理进行分析,结果表明,PSPS不仅可以减少风电并网对电网的冲击,而且可以提高WPC与电网运行的协调性。