A voltage source type energy storage wide frequency band negative resistance characteristic analysis method based on impedance splitting
By simplifying the impedance model of voltage source energy storage inverters through impedance decomposition, dividing the frequency band and analyzing the negative resistance characteristics of the mid-frequency band, the instability problem of voltage source energy storage systems in inductive weak power grids is solved, thereby improving system stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWEST BRANCH OF STATE GRID POWER GRID CO
- Filing Date
- 2023-04-26
- Publication Date
- 2026-05-29
AI Technical Summary
Existing technologies cannot accurately pinpoint the source of negative damping generated by voltage source type energy storage inverters in long-distance, weakly inductive grid environments, leading to system instability and failing to effectively improve system stability.
An impedance-based approach is adopted to simplify the impedance model of a voltage source energy storage grid-connected inverter system through a complex vector synchronization link, dividing it into low-frequency, medium-frequency, and high-frequency bands. The source of negative resistance in the medium-frequency band is analyzed, and the negative resistance characteristics are accurately located using the impedance-based approach.
It enables precise analysis and risk identification of frequency band stability in voltage source energy storage systems, provides a reference for improving the small-signal stability of the system, and avoids the risk of system instability.
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