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.

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.

云南富民、泸西、禄丰抽水蓄能电站水泵水轮机主要参数

云南富民、泸西、禄丰3座抽水蓄能电站是国家《抽水蓄能中长期发展规划(2021—2035年)》和《云南省抽水蓄能中长期规划》“十四五”重点实施项目,装机容量分别为1400、2100、1200 MW。水泵水轮机主要参数的合理选择是抽水蓄能电站安全投运及机组稳定运行的重要保障对富民、泸西、禄丰抽水蓄能电站可行性研究阶段水泵水轮机主要参数选择进行了介绍,为后续工作打下了良好的基础。

利用已建水库建设抽水蓄能电站装机容量选择研究——以泸西抽水蓄能电站开发为例

利用已建水库建设抽水蓄能,在电力系统空间充足且项目技术经济可行的情况下,充分利用已有水库有利条件选择较大的装机容量,可减少电力系统整体投资,节约国土资源和生态空间,但也面临一些关键技术和利益协调问题需重点关注。以泸西抽水蓄能电站为研究对象,提出了利用已建水库、库盆地形地质条件好的抽水蓄能电站装机容量论证思路及关键影响因素,总结形成了相关设计要点及建议。该研究成果可供其他类似工程设计借鉴。

An optimal strategy for coordinating and dispatching “source-load” in power system based on multiple time scales

Due to the phenomenon of abandoning wind power and photo voltage(PV)power in the“Three Northern Areas”in China,this paper presents an optimal strategy for coordinating and dispatching“source-load”in power system based on multiple time scales.On the basis of the analysis of the uncertainty of wind power and PV power as well as the characteristics of load side resource dispatching,the optimal model of coordinating and dispatching“source-load”in power system based on multiple time scales is established.It can simultaneously and effectively dispatch conventional generators,wind plant,PV power station,pumped-storage power station and load side resources by optimally using three time scales:day-ahead,intra-day and real-time.According to the latest predicted information of wind power,PV power and load,the original generation schedule can be rolled and amended by using the corresponding time scale.The effectiveness of the model can be verified by a real system.The simulation results show that the proposed model can make full use of“source-load”resources to improve the ability to consume wind power and PV power of the grid-connected system.

云南省泸西抽水蓄能电站900 m特深孔钻进关键技术

泸西抽水蓄能电站ZK611号孔设计孔深900m,地层岩性为灰岩,地下水位埋深大,岩溶发育,地层复杂,钻进难度大,选用绳索取心工艺。经过研究和摸索,根据钻孔地层结构,使用性能优良的钻井液用屏蔽暂堵剂及钻杆油,合理调配冲洗液、优化钻进参数,积极克服并创新性解决了岩体溶蚀发育强烈、孔内漏水、多段跨孔、地下水位埋深极大、地应力较高等复杂技术难题。该孔为综合勘察钻孔,钻孔结构设计还需考虑钻孔声波、钻孔全孔壁数字成像、高压压水试验、地应力测试及水位观测等。同时,介绍了钻探设备材料的选择和安装,并结合施工情况,对超深孔水位长期观测管施工、超深孔压水试验提出了建议。

柔性直流功率模块比对失败跳闸事件分析

针对鲁西背靠背换流站调试期间发生的一起柔性直流功率模块比对失败,从而导致跳闸的事件,本文对跳闸条件进行了阐述,根据跳闸条件对本次比对失败导致跳闸的原因进行了分析,同时进行了现场排查并确定了故障原因,针对故障原因提出了相应建议,以避免类似事件再次发生。

Study on S-shaped characteristic of Francis reversible unit by on-site test and CFD simulation

The operation parameters （vibration, shaft displacement and pressure fluctuation） of No. 1 Francis reversible unit of Baoquan pumped-storage power station were measured on site in the no-load mode at net heads of 518.04, 522.01 and 530.38 m, re- spectively. The rotational speed fluctuations in the no-load mode at three net heads were beyond synchronization requirement with obvious S-shaped characteristic, and misaligned guide vanes （MGV） had to be put into use for synchronization. Further analysis demonstrated that the rotating frequency signal was generally dominant in vibration and shaft displacement mixing signal in the no-load mode, while the frequency domain was wide without an obvious main frequency in pressure fluctuation mixing signal. Besides, the SSTκ-ω turbulence model was adopted to simulate the four quadrant characteristic curves of Baoquan model pump-turbine at three gate openings, and the relative error between simulation results and model test data was within ±6%, indicating that the simulation method in this paper is feasible and S-shaped characteristic of the pump-turbine can be simulated with CFD method.