Grid Impedance Estimation and Stability Assessment in Power Systems
Summary
Grid impedance estimation and stability assessment constitute pivotal elements in the design, operation and integration of modern power systems. As renewable energy sources and power-electronics converters proliferate, the effective matching of converter admittance to the dynamic grid impedance becomes essential to avoid oscillations, resonance phenomena and poor power quality. Grid impedance varies with network topology, loading conditions and the presence of parallel generation units, making real-time estimation techniques indispensable for adaptive control and islanding detection. Stability assessment increasingly relies on impedance-based methods that combine small-signal modelling with frequency-domain analysis, such as Nyquist and Bode criteria, to predict interactions between inverters and the network. Practical applications span from microgrid resilience and anti-islanding schemes to wide-area monitoring in weak‐grid scenarios, contributing to enhanced reliability, efficient integration of distributed resources and global decarbonisation goals.
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Grid Impedance Estimation and Stability Assessment in Power Systems publication trend
The graph below shows the total number of articles in grid impedance estimation and stability assessment in power systems across all publications each year (not limited to Nature Index journals).
Technical terms
Grid impedance: The frequency-dependent equivalent impedance presented by the power network as seen from a point of coupling, affecting converter interactions and resonance behaviour.
Admittance: The inverse of impedance, representing how easily a system allows current to flow under applied voltage, often analysed in converter output models.
Phase-locked loop (PLL): A control algorithm that synchronises converter reference signals with grid voltage phase and frequency, influencing output admittance and potential negative-resistance effects.
Positive- and negative-sequence control: Techniques that decompose three-phase signals into balanced components to enable accurate impedance estimation under unbalanced conditions.
Power hardware-in-the-loop (PHIL): A real-time experimental framework where physical converters interact with simulated network models, facilitating dynamic impedance and stability measurements.
Small-signal stability: Analysis of system response to infinitesimal perturbations, typically via eigenvalue or frequency-domain methods, to determine damping and oscillatory modes.
References
- Grid impedance estimation for islanding detection and adaptive control of converters. IET Power Electronics (2017).
- Online Parametric Estimation of Grid Impedance Under Unbalanced Grid Conditions. Energies (2019).
- Review of Local Network Impedance Estimation Techniques. IEEE Access (2020).
- Hardware-in-the-Loop Methods for Stability Analysis of Multiple Parallel Inverters in Three-Phase AC Systems. IEEE Journal of Emerging and Selected Topics in Power Electronics (2020).
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