Analysis on the Maximum Leading Phase Operation Capability of Pumped Storage Units in Leading Power Factor Test

In order to improve the accuracy of the maximum leading phase operation capability assessing of pumped storage units, a novel calculation method considering three restrictive factors of power angle, stator current and terminal voltage is proposed. Under power generation and pumping work conditions, the maximum leading phase operation capability is analyzed, and the influence of transformer tap position on the maximum ability is studied as well. Taking a 300MW pumped storage unit as an example, the Q-PV three-dimensional surface of maximum leading phase operation ability changing with the system voltage and active power are shown in the picture. Under the typical working conditions, theoretical calculation results are basically consistent with the testing data, which validates the correctness and practicability of the proposed method.