关键词: 背靠背启动, 可逆式机组, 控制流程, 启动过程, 振荡分析

Abstract:

With the increasing capacity of the power grid, the reversible pumped-storage hydropower station as a special power supply with the functions of load balancing, frequency regulation and phase modulation and emergency reserve demonstrates its advantages of flexibility and quick response in ensuring the safe, stable and economical operation of the power system. Back-to-back starting serves as a convenient, alternative way to start a reversible pumped-storage station when failures occur to the static frequency converter used in the normal starting mode. Based on a test of back-to-back starting in a large pumped-storage station, the dragging process of the units and the starting process of the dragged unit are explained. The problems in the dragging test are taken as an example, and the impacts of excitation, opening process of guide vanes and sub-synchronous over current protection on the staring process are analyzed. According to the field shakedown test and operation experience, directed solutions are proposed to meet the reliability index of the units.

Key words: back-to-back starting, reversible pumped-storage unit, control process, starting process, analysis of oscillation