Optimal operation of cascade hydro-wind-photovoltaic complementary generation system with vibration avoidance strategy

Jia, Rui; He, Mengjiao; Zhang, Xinyu; Zhao, Ziwen; Han, Shuo; Jurasz, Jakub; Chen, Diyi; Xu, Beibei

doi:10.1016/j.apenergy.2022.119735

Cited by 15 publications

(1 citation statement)

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“…Additionally, due to the significant expansion of intermittent energy sources, such as solar and wind power, the electricity grid has imposed greater demands on the regulating capacity of hydropowers. Consequently, the power regulation range and frequency of hydropower systems have increased significantly [3,4], and hydropower units often operate in non-optimal conditions, the operating condition point also varies over a wide range. Therefore, ensuring the stable operation of hydropower systems under various operating conditions is one of the most fundamental and important tasks, which supports the security and stability of the power grid and the long-term development of renewable energy strategies.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of hydropower unit operation conditions considering hydro-turbine nonlinearity

Lu,

2024

J. Phys.: Conf. Ser.

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This paper aims to study the law that the stability of hydropower systems changes with the system operating point and clarify the impact of hydro-turbine nonlinearity and hydraulic nonlinearity on the system stability. Firstly, the piecewise linearized model of the hydro-turbine regulation system (HTRS) at various operating points is established. Then, the HTRS stability domain is calculated and analyzed under various working heads and guide vane openings, and the impact of head variation on system stability is researched from the perspectives of discharge and power. Finally, the stability of various operating conditions under ideal hydro-turbine conditions and rated hydraulic parameter conditions are and compared to clarify the role of the water system and turbine nonlinearity on the stability. The results show that hydro-turbine nonlinearity helps to improve the system stability of the overall operating conditions, but the stability of the HTRS is relatively weak during high-load and low-head operations. Moreover, the hydro-turbine nonlinearity plays a dominant role in the process of stability changing with the operating head. This paper provides a comprehensive analysis of the system stability at different operating points, which can help guide the control optimization of hydropower systems.

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Section: Introductionmentioning

confidence: 99%