Abstract
Voltage stability in medium-voltage DC (MVDC) power systems is a key design goal. Based on Norton’s Theorem and Thevenin’s Theorem, the equivalent circuit model of MVDC power system is established. Furthermore, the supercritical reduced-order circuit model is established by ignoring the line parameters, and it is found that the negative impedance characteristic of CPL is the main reason for the oscillation instability of MVDC power system. Therefore, a state feedback control algorithm based on Taylor expansion for generation-side converters is proposed in this paper, which compensate for the negative incremental resistance of CPL in MVDC power systems. Obviously, the control strategy could be conveniently implemented in decentralized controller, which is the most simple and desirable control structure in MVDC power system. Numerous simulation results verify the rationality of the supercritical reduced-order model and the effectiveness of the proposed control algorithm.
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