Abstract
Inverter-based power system is essentially a nonlinear system, and the voltage and frequency are coupled to each other. As the nonlinear models of inverter-based power systems are considered, a novel observer-based secondary voltage and frequency restoration control scheme is proposed. Some features distinguish our control scheme from the existing secondary voltage and frequency control strategies. Firstly, the proposed control scheme can integrate the advantages of centralized and decentralized control systems. The designs of the voltage and frequency controllers are totally decoupled. Secondly, the transient stability conditions under the lossy-line network are derived and analyzed rigorously by applying large-signal stability analysis method. Thirdly, the proposed secondary control schemes are implemented in a fully distributed way such that the power systems can realize the plug-and-play function.
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