Carbon Footprint in Waste Sector of Hydropower Plant: A Case Study of Nam Theun 2 Hydropower Plant

While hydropower is generally considered a clean energy source, it is important to recognize that their waste can still contribute to greenhouse gas emissions (GHG). The purpose of this study is to assess the carbon footprint associated with the waste sector throughout the operational phase of the Nam Theun 2 hydropower plant in Laos. Understanding the environmental impact of the waste sector is crucial for ensuring the plant’s sustainability. This study utilizes the theoretical estimation method recommended in the 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories, as well as the Requirements for Specification with guidance at the organization level for quantification and reporting of GHG emissions and removals. We emphasize the significance of implementing sustainable waste management practices to reduce GHG emissions and minimize the environmental impact of hydropower operations. By conducting a comprehensive analysis, this paper also provides insights into the environmental implications of waste management in hydropower plants and identifies strategies to mitigate the carbon footprint in the waste sector. The findings contribute to a better understanding of the environmental sustainability of hydropower plants and provide valuable guidance for policymakers, energy producers, and environmental practitioners involved in hydropower plant design and operation.

Load Frequency Control of Small Hydropower Plants Using One-Input Fuzzy PI Controller with Linear and Non-Linear Plant Model

This study presents an intelligent approach for load frequency control (LFC) of small hydropower plants (SHPs). The approach which is based on fuzzy logic (FL), takes into account the non-linearity of SHPs—something which is not possible using traditional controllers. Most intelligent methods use two- input fuzzy controllers, but because such controllers are expensive, there is economic interest in the relatively cheaper single-input controllers. A non- linear control model based on one-input fuzzy logic PI (FLPI) controller was developed and applied to control the non-linear SHP. Using MATLAB/Si- mulink SimScape, the SHP was simulated with linear and non-linear plant models. The performance of the FLPI controller was investigated and compared with that of the conventional PI/PID controller. Results show that the settling time for the FLPI controller is about 8 times shorter;while the overshoot is about 15 times smaller compared to the conventional PI/PID controller. Therefore, the FLPI controller performs better than the conventional PI/PID controller not only in meeting the LFC control objective but also in ensuring increased dynamic stability of SHPs.

Experimental study on dynamic pipe fracture in consideration of hydropower plant model

In the case of sudden valve closure, water hammer creates the most powerful pressure and damage to pipeline systems. The best way to protect the pipeline system is to eliminate water hammer. The main reasons for water hammer occurrence are valve closure, high initial velocity, and static pressure. However, it is difficult to eliminate water hammer. Water hammer tends to occur when the valve is being closed. In this study, the pipe fracture caused by static water pressure, gradually increasing pressure, and suddenly increasing pressure were compared experimentally in a breaking PVC test pipe. The quasi-static zone, the dynamic zone, and the transition zone are defined through the results of those experiments, with consideration of the fracture patterns of test pipes and impulses. The maximum pressure results were used to design the pipeline even though it is in the dynamic zone.

Performance Evaluation of Sediment Basins: Case Study of Keya Hydropower Plant in Rwanda

Keya Hydropower Plant (HPP) is a run-off-river plant which can be an effective green solution contributing to the current energy demand in Rwanda but a huge amount of sediment contained in water of Sebeya River on which this plant is built results in loss of the plant capacity. The aim of this study was to conduct the performance evaluation of Keya HPP sediment basin located in Rubavu district, western province of Rwanda. Specifically, laboratory tests of sediment, efficiency of the basin, assessment of sedimentation problems on HPP operations, proposition of technical options for increasing the removal efficiency of sediment basin and other options for reducing sediment at the source of generation were performed using different methods including interviews and questioning Keya hydropower technicians, field sediment sampling followed by hydrometer and Particle Size Distribution (PSD) analysis. Analysis was made in University of Rwanda (UR) Soil Mechanics laboratory. MICROSOFT EXCEL and Graphisoft Archicad 18 softwares with Massachusetts Institute of Technology (MIT) soil classification were used as data analysis tools. Results showed that the overall efficiency removal of the diversion headwork was 85%. However, after comparing sediment concentration at the inlet and outlet of the sediment basin, it was found that the basin removed only 22% of sediment from diverted water toward the turbine. This means that 78% of sediment escapes the basin to cause erosion on the turbine components resulting in reduction of the plant capacity from 2.2 MW to 900 KW. To ensure sustainable solution to sediment issues in Keya HPP, an upstream sediment trap reservoir is proposed. It is recommended also that Rwanda Energy Group (REG) should work together with Rwanda Natural Resource Authority (RNRA) at national level to ensure sustainable development of erosion control in the Sebeya catchment area.

Current Situation and Prospect of Pumped-Storage Hydropower Plant in China

With the rapid development of national economy in China, pumped-storage power plant(PSPP) has developed very fast for its special stable and dynamic benefits in recent years.Because of the ever-increasing power load and its peak-to-valley ratio, customers have higherexpectation for the securityand quality ofpower supply. PSPPs are playing a role in load regulation,energy saving and reliable operation of power girds with its unique peak-shifting character.

Quali-Quantitative Analysis of Brazilian Environmental Licensing of Hydropower Plants

The use of the extraordinary hydroelectric potential of the Amazon Basin originated an increase in the offer of renewable energy in Brazil, which, in its turn, leads to conflicts and a lack of consensus among different players owing to the potential negative impacts related to the construction and operation of large hydroelectric power plants in relatively well preserved areas. In this context, environmental licensing is one of the national environmental policy’s main instruments for making decisions regarding the use of the hydroelectric potential, especially the rivers of the Amazon Basin. Nevertheless, this significant instrument has its limitations and requires adjustments in order to better aid the decision making process regarding the use of water resources and land with the goal of increasing the offer of electric energy.

A Study on Importance and Role of Irrigation and Hydropower Plant Operation in Integrated River Basin Management

In this study, 16 irrigation schemes (Baklan, Irgilli, Sutlac, Cal, Cürüksu, Nazilli, Saraykoy, Pamukkale, Sultanhisar, Akcay, Aydin, Topcam, Karpuzlu, Isikli, Gümüssu ve Soke) having 166,381 hectares, built by State Hydraulic Works (DSI), and operated by participatory irrigation managements, and 14 hydroelectric power plants (HPP) operated and built on dams, canals and rivers by the public and private sectors are examined in the Büyük Menderes basin which is an important basin in terms of the agriculture, energy and ecology projects. Integrated basin management practices and the importance and role of irrigation and hydropower plant operation in integrated basin management, how it should be, optimal use of available water resources for irrigation and hydroelectric power plant operation, irrigation relationship with canal hydropower plants, operated under integrated basin management of irrigation and hydropower plants, environment and the ecological effects have been studied, and integrated basin management with the existing basin management conditions in terms of hydropower plant and irrigation operation on the basis of data of 2015 have been compared, reached important conclusions, and made recommendations on the subject.

Relationship between Selected Physiographic Features and Landslide Occurrence around Four Hydropower Projects in Bhagirathi Valley of Uttarakhand, Western Himalaya, India

The Himalayan mountain range is an internationally recognised landscape but one under increasing developmental threat. The lower Himalayan region possesses immense potential for hydropower generation but is also highly susceptible to tectonic deformation and mass wasting, especially landslides. Susceptibility to landslides increases markedly with human activity, especially large scale developmental projects. The impacts of massive hydropower plant construction in the Bhagirathi Valley, Uttarkhand, India on the generation of landslides are the focus of this study. Whilst many positive impacts derive from such projects, devastating negative impacts also accrue. The frequency and characteristics of land sliding within the sphere of influence of the construction sites of the various hydropower plant components were investigated. Landslide frequency was related to parameters of geology, prior land use, drainage density, slope steepness and location in terms of construction aspect. Landslide frequency was found to be greatest in gneissic terrain as well as on previously agricultural and forested lands. Statistical analysis revealed significant relationships between landslide frequency with slope and, frequency with construction aspect, especially the construction of access roads. As with other studies, road construction is the key initiator of land sliding due to slope over steepening and the indiscriminate dumping of debris. The study concludes with recommendations for reducing the frequency and magnitude of mass wasting in this environment.

Hydropower Energy Source Combining with Other Renewables in the Teritory of Kosova

With the continuous growing of population and the economical needs in the Balkan region, as in the whole world, the needfor new energy resources is getting more reasonable than ever. Considering the nowadays exponential growth in development of therenewable energy sources, in this paper, a comparison of the hydropower energy capacities with the wind and solar energy sources,in the territory of Kosova is generally presented. Today, the territory of Kosova, has 1,513 MW installed capacity of electricity,which is generated from two thermo-power plants KOSOVA A and KOSOVA B. This energy generation capacity is proved to beinsufficient for meeting the entire electricity needs of the 2 million population and the overall economical development. In this paper,a specific attention is given to the electricity generation by the renewable energy sources as the wind and hydropower. A specificemphasis is given to the combination of hydropower with wind power, in Kosova, as a optimal solution for the generation of therenewable energy sources. In this paper, a concrete idea for combining the ZHUR hydro-powerplant system with the numerous windturbines is given, which could be placed in the near zone of this hydropower-plant. In combination, these electricity regeneratorswould promise a more reliable energy source, and contribute to the fulfilment of the overall electricity requirements of Kosova.

混合式抽水蓄能电站群容量计算研究Ⅰ:短期调峰特征与梯级开发增益

依托常规梯级水电站修建混合式抽水蓄能电站(简称混蓄电站)成为提升电力系统调峰能力的重要途径。混蓄电站即可抽水又可发电的典型运行方式增加了水电基地的灵活性调节能力,为此亟需研究其运行方式以及与原有梯级水电站运行方式间的互馈关系。研究以黄河上游待开发龙羊峡-拉西瓦、拉西瓦-尼那混蓄电站为对象,建立含混蓄电站的梯级水电站短期联合调峰优化模型,分析混蓄电站对原有梯级水电站运行方式的影响,基于理论推导与数值计算两种方法揭示混蓄电站调峰效果的变化特征。主要结论如下:(1)混蓄电站抽水水量经由原有梯级水电站机组下泄,使得非填谷时段原有水电站出力增加,水电站上旋备容量降低;(2)龙羊峡水电站满发流量相对较小、拉西瓦水库调节库容较小以及日综合利用供水流量过大是制约混蓄电站调峰效果的主要因素,发现了综合利用流量影响混蓄电站调峰效果的临界特性,并提出了临界综合利用流量的计算公式;(3)发现并量化了混蓄电站梯级开发模式较单一开发模式所带来的梯级抽水调峰增益现象,并揭示了梯级抽水调峰增益背后所蕴含的“河流梯级反向再造”内在机理。

乌东德水电站日调峰对下游裂腹鱼类栖息地的影响

日调峰是乌东德水电站日常运行的主要出力约束和调度目标。为了探讨电站调度引起的出库流量大幅涨落对下游生态环境的不利影响,采用河道内流量增量法,通过构建二维水动力模型,研究了乌东德水电站日调峰引起的下游河段水文水动力条件波动对裂腹鱼类繁殖期栖息地适宜性的影响,并分析了2023年电站基荷发电生态调度试验效果。结果表明,乌东德电站下泄流量低于1160 m^(3)/s,坝下江段裂腹鱼类潜在产卵场面积相对较大;流量高于2000 m^(3)/s,裂腹鱼类潜在的产卵场面积显著减少。电站日调峰结束时,出库流量降幅越大,裂腹鱼类潜在产卵场脱水面积及鱼卵脱水风险越大。乌东德电站基荷发电生态调度期间,坝下江段裂腹鱼类潜在产卵场的加权面积有所减少,但潜在产卵场和鱼卵早期的脱水风险显著降低。为提高繁殖期裂腹鱼类生境适宜性和持续性,有必要进一步减少电站日调峰频率,降低出库流量至适宜区间。

不同生态流量需求下雅砻江中下游梯级电站联合优化调度

为协同雅砻江干流水力发电与河道生态流量需求,以中下游7座电站为研究对象,进行不同生态流量需求下雅砻江中下游梯级电站联合优化调度。基于改进型可变月径流法,计算了雅砻江主要生态控制断面最小、适宜及最佳生态流量过程;构建了以梯级发电量最大化为目标的雅砻江中下游梯级电站联合优化调度模型,并用遗传算法对其求解。结果表明:(1)随河道生态流量需求的提高,梯级电站发电效益和水资源利用效率均下降,其中锦屏二级电站发电量下降最为显著;(2)梯级电站保障发电效益正常发挥的同时,实施联合优化调度,其下游河道能维持更高层次的生态流量,一定程度缓解了流域水能开发利用与河道生态保护间的关系。

基于逆向学习的水电厂现场作业风险预警模型研究

以保障水电厂现场作业安全为目的,研究基于逆向学习的水电厂现场作业风险预警模型。从公共风险、机组器械系统设备风险、电气系统设备风险与水工建筑风险四类风险出发选取指标构建水电厂现场作业风险预警指标体系。采用基于逆向学习传感系统,基于传感器输入样本点与期望输出值组成的线性表反演测量点位置,获取准确的风险预警指标数据。利用LSTM神经网络构建风险预警模型,将预警指标数据作为模型输入,将风险预警等级作为模型输出,通过传播路径实施反向输出比对,优化不同权重矩阵与偏差,由此获取水电厂现场作业风险预警结果。同时利用基于逆向学习行为粒子子群算法优化预警模型参数,提升模型预警精度。实验结果显示该模型能够准确预警水电厂现场作业风险,保障现场作业的安全性。

多能互补发电系统故障识别与测距方法

随着大量新能源的接入,使得多端柔性直流系统(modular multilevel converter based multi-terminal direct current, MMC-MTDC)故障特征愈加复杂,快速准确的故障识别与测距是亟需解决的关键难题之一。为此,提出了一种风-光-储-蓄互补发电站经柔性直流输电外送系统故障识别与测距方法。首先,搭建风-光-储-蓄互补发电站经柔直外送系统,在此基础上,提出了一种Teager能量算子能量熵的新方法,利用测量点正负极Teager能量算子能量熵的比值构建故障选极及区段识别判据。接着,针对已识别的故障线路,提出变分模态分解(variational mode decomposition, VMD)与Teager能量算子(teager energy operator, TEO)相结合的故障测距方法。最后,利用PSCAD/EMTDC进行仿真,结果表明所提识别方法可以准确判断故障所在线路,所提测距方法能在故障发生2 ms时间窗内实现故障测距,误差率不超过2.55%,并具有较高的耐过渡电阻能力。

基于熵权-TOPSIS的水电厂桥式起重机综合多轨迹规划控制策略

水电厂桥式起重机负载大,制动时加速度变化和惯性摆动会导致桥机定位精度低,对此,提出了基于熵权-TOPSIS评价方法的综合多轨迹控制策略,应用于桥式起重机行走过程控制。通过Matlab仿真获得桥机4种行走轨迹曲线,将4种轨迹曲线和桥机模型导入到Adams运动仿真平台,由仿真结果构建轨迹评价指标体系,基于熵权-TOPSIS评价方法对不同位移下的桥机行走轨迹规划算法进行综合评分。评分结果表明,不同轨迹算法在不同位移条件下运动特性不同。因此,在桥机行走控制过程中,可根据桥机行走距离的不同选择不同的轨迹曲线,相比于单一轨迹曲线控制,多轨迹规划控制可有效提高水电厂桥机定位精度以及大部件吊装的安全性。

火灾自动报警系统在大型水力发电厂的智慧应用

水布垭电厂原火灾报警系统运行年限超长,存在设备老化损坏、故障频繁、操作困难、进口备件停产、火警误报率高等严重问题。于2021年对厂内火灾报警系统更新改造,在设计优化、设备选型、通信联网、与电厂生产系统的智慧结合等方面做了大量前端的、因地制宜的改进,使系统能够稳定、高效、可靠、智慧管理,为电厂和大电网的稳定运行提供更有力、可靠的安全保障。

高坝洲电厂机组制动器及顶转子系统改造可行性研究

高坝洲电厂发电机制动器及顶转子系统由12台ZD220-1型单活塞制动器和配套管路组成。设备经长时间运行已出现部件损伤、密封失效,因油污粘导致电磁阀失效等,给机组正常运行带来安全隐患。基于对各种隐患产生原因分析与改造方案研究表明,对高坝洲电厂发电机制动器及顶转子系统进行优化,实现油气分离,对顶转子系统的顶起高度、压力的数据采集并智能控制等,保障机组长期安全稳定运行,有效推动智慧电厂建设是可行的。

水布垭电厂转轮联轴螺栓拆卸工具设计

水布垭电站扩大性检修中,水轮机组转轮与主轴联接螺栓拆卸需要利用液压拉伸器进行松动,过去只能纯靠人力操作,且内部空间狭小,作业困难,并有很大的安全隐患,为此设计了专用拆卸工具,包括支架、2个支撑板和多个连接板等,支架上设有圆盘推力轴承。该工具减少人工操作,降低施工难度,提高了拆卸效率和安全可靠性,有效保障了拆卸作业质量。