Analysis based on the Phase Entry Test of Pumped Storage Power Station Units

DOI: https://doi.org/10.62517/jes.202502401

Author(s)

Ziyang Zhang*, Xun Fu

Affiliation(s)

Shandong Yimeng Pumped Storage Co., LTD, Linyi, Shandong, China

Abstract

The phase entry operation of synchronous generator is an economical and efficient measure to solve the excess reactive power and high voltage during the off-peak operation of power grid. A Pumped Storage Unit has a series of phase entry test before it’s commercial operation. In this way, it can examine the low excitation limit ability of the excitation regulator under different working conditions, and also verify the regulation ability of the phase entry operation on the power grid voltage of 500kV system. Through the four Pumped Storage Units’ advanced test, it summarizes the actual leading capacity, limiting factors of generation/motor, and the regulation effect, influence on 500kV voltage of power grid, analyzes the excitation regulator's effect on improving generation/motor phase entry capacity and static/dynamic stability. Finally, it determines the safe operating range of the generation/motor phase entry, and determines the rationality of the main transformer and high plant transformer connection position. It guarantees for the safe and stable operation of the power grid by the phase advancement capability analysis.

Keywords

Generation/Motor; Phase Entry; Excitation; Low Excitation Limit

References

[1] Feng Hao, Min Zhou, Network-related safety assessment test of pumped storage power station units. Hydropower and Pumped Hydro Storage, 2015, (3):89-92. [2] Yang Liu, RuiQing Wang, Research on intelligent excitation mode of pumped storage power station excitation system. Hydropower and New Energy, 2025, 39(02). [3] Tao Zhou, Jianfa Li, Design of microcomputer excitation regulation control system based on PLC redundancy control. Guangxi Water Conservancy and Hydropower, 2024(01). [4] Chenxi Cai, Junfeng Wu, Analysis and test of phase operation capacity of a large pumped storage power station. Electromechanical Technology of Hydropower Stations, 2025, 48(06):1-7. [5] Yang Wei, Ligui Wu, Research and software development of prediction model for the maximum phase advance depth limited by demagnetization protection of hydro turbine generator. Hydropower and Pumped Hydro Storage, 2024, 10(05):33-37. [6] Yong Zhang, Jichao Han, Magnetic density and loss of large-scale variable speed pumped storage power generation motors under different phase feed conditions. Big Motor Technology, 2024, 51(04):51-55. [7] Xiang tong Li, Simulation study of generator phase advance test and main transformer tap selection. Northeast Power Technology, 2024, 45(04):48-51. [8] Feng Chen, Generator phase intake test and analysis of voltage regulation effect at different inlet depths research on stability assessment and prediction methods for smart grids. Information, 2025, 51(04):191-195. [9] DL/T 1523-2016 Guidelines for phase testing of synchronous generators. National Energy Administration. [10] DL/T 1166-2012Guidelines for field tests of large generator excitation systems. National Energy Administration.