Mixed Voltage Angle and Frequency Droop Control for Transient Stability of Interconnected Microgrids with Loss of PMU Measurements

S Sivaranjani, Etika Agarwal, Le Xie, Vijay Gupta, Panos Antsaklis

We consider the problem of guaranteeing transient stability in angle droop controlled microgrid networks where voltage angle measurements from phasor measurement units (PMUs) may be lost. In the event of PMU measurement loss at some microgrids, the network may become unstable if there is a mismatch between load and power generation. To address this issue, we present a novel approach to indirectly control the voltage angle via traditional frequency droop controllers at microgrids where angle measurements are unavailable. We show that this mixed voltage angle and frequency droop control (MAFD), along with a secondary controller, can be used to guarantee transient stability of the microgrid network under intermittent losses of PMU measurements, where traditional angle droop controllers may fail. In this paper, we introduce the idea of MAFD, derive a dynamical model for microgrid networks in the MAFD setting, design a secondary controller to guarantee transient stability under angle measurement losses, and illustrate the design using numerical simulations.

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