Additional Synchronous Torque Coordinated Control for Approximate-Capacity Diesel-Storage Supply System With Low-Frequency Pulsed Load

Abstract

For the power supply of low-frequency pulsed load, the approximate capacity diesel-storage supply system is difficult to dynamically synchronize the output powers of the diesel generators and energy storage converter, resulting in continuous power oscillations and unbalanced power distribution. For this, a coordinated control with additional synchronous torque is proposed to dynamically adjust the virtual torque of the energy storage converter for narrowing the angular accelerations gap with that of diesel generator, and realizing the synchronous power supply during the dynamic process. Meanwhile, the time-domain model incorporating pulsed load is established. The power oscillation mechanism is elaborated from the perspective of normalized oscillation power, and it is found that the oscillation power is mainly affected by the accelerations difference and pulsed period. Afterwards, the principle of the proposed coordinated control method is clarified, and the parameters are properly selected. Furthermore, the stability analysis with the proposed method based on Lyapunov stability theorem is elaborated. Finally, the experimental results verify the effectiveness of the proposed method.