储能系统抑制电网功率振荡的机理研究

To reveal the mechanism of energy storage system (ESS) to suppress the power oscillation of power system, this paper firstly establishes a mathematical model of single-machine infinite grid with ESS at electromechanical time scale. Subsequently, the classical electric torque method is used to analyze the physical mechanism, key factors and influence laws of the inertial effect, damping level and synchronization capability of the synchronous generator (SG) dominated power system. The results show that when the ESS control strategy adopts the power angle control, adjusting the PD parameters of the ESS can equivalently change the synchronization capability and damping level of the SG dominated power system. Moreover, when the ESS control strategy uses the rotor speed control as the outer loop feedback signal, the PID parameters of the rotor speed control loop affect the damping level, synchronization capability and inertial effect of the SG dominated power system, respectively. The simulation results verify the correctness of the mechanism analysis of ESS suppression power oscillation of SG dominated power system. In addition, the conclusions of this paper help to design an effective ESS control strategy for improving the inertial level and damping capability of power system.