Current-Based Dynamic Power Network: Modeling, Control, and Applications

This paper proposes a novel unified nonlinear dynamic power network model in an arbitrary dimensional real vector space to study the quantitative interactions among the generalized current injections, the frequency oscillations, and the voltage variations. Further, an innovative dynamic current decoupling control (DCDC) approach is developed. The DCDC cancels the adverse influences of the nonlinear couplings between the active and the reactive control loops. Also, it increases the system damping of the changes of both frequency and voltage simultaneously. The closed-loop system with the proposed DCDC scheme is proved theoretically to be globally exponentially stable in the Lyapunov sense. Then, we apply the presented DCDC approach to the control syntheses of the voltage-sourced converter (VSC) based static synchronous compensator (STATCOM) and the doubly fed induction generator (DFIG). The superiority of the DCDC method is further evaluated comparatively by implementing the designed controllers of STATCOM and DFIG on WSCC 9-bus system, IEEE New England 39-bus system, and IEEE 14-bus system.