A study on dynamic characteristics of low head start-up process of a full-size converter variable speed pumped storage unit

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (24) : 225-233.

LIU Zhang,LIU Gongcheng,GAO Yuanqiang,ZHANG Yunpeng,ZHAO Ziwen,CHEN Diyi

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Abstract

To address the issue of start-up stability in pumped-storage units under low head conditions, this paper introduces a start-up strategy that employs full-size converter variable speed operation in such conditions and simulates the start-up process for pumped-storage units with full-size converter variable speed. It is recognized that the starting speed is a crucial parameter influencing the start-up characteristics of variable speed units with low water head. However, the specific impact of starting speed on the start-up traits of full-size converter variable speed units under low water head conditions remains uncertain. Consequently, this study delves into the dynamic operating trajectories and the starting characteristics, including volute pressure, draft pipe pressure, and excitation system responses, for a range of starting speeds under low water head conditions. The findings reveal that the variable speed start-up strategy presented herein effectively prevents the unit from entering the inverse "S" characteristic zone. With identical initial settings and governor controls, full-size converter variable speed units that commence start-up at speeds between 82.5% and 87.5% can achieve a stable operating state in a shorter time frame. The initiation of the full-size converter variable speed unit at a variable speed results in a leftward shift of the operational starting area along the characteristic curve, thereby enhancing the stability of the volute pressure within the unit. In addition, the impact on the excitation system is minimal, which is conducive to fundamentally solving the challenges brought by low head start-up and grid connection. The insights gained from this research offer valuable decision-making support for the start-up strategies of both full size converter variable speed unit and fixed speed unit post-modification.

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pumped storage / variable-speed unit / low head condition / S-shaped characteristic / full size converter

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LIU Zhang, LIU Gongcheng, GAO Yuanqiang, ZHANG Yunpeng, ZHAO Ziwen, CHEN Diyi. A study on dynamic characteristics of low head start-up process of a full-size converter variable speed pumped storage unit[J]. Journal of Vibration and Shock, 2024, 43(24): 225-233

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