期刊
IEEE TRANSACTIONS ON POWER SYSTEMS
卷 36, 期 5, 页码 3997-4017出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2021.3061434
关键词
Power system stability; Power system dynamics; Stability criteria; Analytical models; Power conversion; Inverters; Converters; Differential-algebraic equations; low-inertia systems; small-signal stability; synchronous generator; voltage source converter
The paper investigates the impact of large-scale integration of renewable energy interfaced through power electronics on power system dynamics, developing a dynamic model and using modal analysis techniques to explore the stability properties of the system and proposing potential directions for improving system stability.
Large-scale integration of renewable generation, usually interfaced to the network through power electronics, has led to drastic changes in power system dynamics. This paper presents novel insights into stability properties of such systems. For that purpose, a high-fidelity dynamic model of a generic low-inertia power system has been developed. The full-order, state-of-the-art control schemes of both synchronous and converter-based generators are included, with the latter differentiating between grid-forming and grid-following mode of operation. Furthermore, the dynamics of transmission lines and loads are captured in the model. Using modal analysis techniques such as participation factors and parameter sensitivity, the most vulnerable segments of the system are determined and the adverse effects of timescale coupling and control interference are investigated. More precisely, this work characterizes the maximum permissible penetration levels of inverter-based generation as well as the nature of the associated unstable modes and the underlying dynamics. Finally, potential directions for improving the system stability margin under different generation portfolios are proposed for several benchmark systems.
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