Nonlinear modeling and operation stability of variable speed pumped storage power station

This paper studies the nonlinear modeling and operation stability of variable speed pumped storage power station (PSPS). Firstly, basic equations PSPS are established. Nonlinear state equation in form relative deviation value is derived by considering supplementary conditions. Then, Hopf bifurcation analysis carried out. Stable domain studied. Finally, influence factors on analyzed. Dynamic response investigated. The results indicate that a five-order dynamic system. characteristics reflect coupling effect between unit rotor current. emerged supercritical. locates at lower side line. intuitively reflects evaluates PSPS. When point stable domain, variables damped oscillation. A smaller flow inertia penstock, greater head loss slip ratio favorable for under positive disturbance active larger than negative power.