Fast Local Voltage Control Under Limited Reactive Power: Optimality and Stability Analysis

By Hao Zhu, Hao Jan Liu. IEEE Transactions on Power Systems, 2015

374 citations recorded by the source corpus.

High penetration of distributed energy resources presents several challenges and opportunities for voltage regulation in power distribution systems. A local reactive power (VAR) control framework will be developed that can fast respond to voltage mismatch and address the robustness issues of (de-)centralized approaches against communication delays and noises. Using local bus voltage measurements, the proposed gradient-projection based schemes explicitly account for the VAR limit of every bus, and are proven convergent to a surrogate centralized problem with proper parameter choices. This optimality result quantifies the capability of local VAR control without requiring any real-time communications. The proposed framework and analysis generalize earlier results on the droop VAR control design, which may suffer from under-utilization of VAR resources in order to ensure stability. Numerical tests have demonstrated the validity of our analytical results and the effectiveness of proposed approaches implemented on realistic three-phase systems.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/93f45923d1670d92a73765afb87683882725aa1f

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Citations in the corpus

Distributed and Decentralized Voltage Control of Smart Distribution Networks: Models, Methods, and Future Research (2017, background): “1) only use measurements at the point of common coupling (PCC) and no other remote measurement on the grid [4]–[6].”
Review of Challenges and Research Opportunities for Voltage Control in Smart Grids (2019, background): “Another major issue is the non-adaptability of the droop VVC in changing conditions which challenges the real-time implementation of the control.”
Research Roadmap on Grid-Forming Inverters (2020, background): “Recent findings indicate that the coexistence of control delays and piecewise voltVAR relationships might be responsible for such behavior (Farivar, Chen, and Low 2013; Zhu and Liu 2016).”