A new index for frequency stability assessment in Low-Inertia Power Systems
Sishi Qin, Sim Sy Yi, Chao Zhang, Huaying Zhang
TL;DR
This paper introduces a new index to assess frequency stability in power systems with low inertia, using mathematical models and real-world data.
Contribution
The paper proposes a novel frequency stability margin (FSM) index tailored for low-inertia power systems.
Findings
The FSM index was validated using provincial-level Chinese grid data and a modified IEEE 39-bus system.
The FSM provides a theoretical framework for optimizing new energy power plant planning and grid control strategies.
Abstract
As grid-forming converters (GFM) and grid-following converters (GFL) continue to be integrated into low-inertia power systems in place of traditional synchronous generators, the characteristics and forms of system inertia have undergone significant transformation. This evolution poses significant challenges to conventional inertia response mechanisms and analytical methodologies. To address these challenges, this study proposes a novel grid index frequency stability margin (FSM) from the perspective of frequency stability, encompassing its definition, quantitative evaluation, and practical applications. This paper first introduces the mathematical foundations and operational definitions of the FSM. It then systematically investigates the factors influencing FSM and presents a comprehensive mathematical model specifically developed for low-inertia power systems. The FSM calculation…
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Taxonomy
TopicsMicrogrid Control and Optimization · Wind Turbine Control Systems · Power System Optimization and Stability