Multi-Frequency Oscillation Suppression Method for DC Bus Voltages Based on Oscillation Energy Suppressor

The low damping characteristics of constant power loads can easily lead to oscillations in the DC bus voltage, destabilising the DC microgrid. To this end, a bidirectional DC-DC structured oscillation energy suppressor (OES) is used to suppress this phenomenon, and its topology and operating states are described. An oscillation energy suppressor based multi-frequency oscillation suppression method is proposed. This method identifies the main oscillation frequencies and is used in the control strategy of the OES, which enables the suppression of several main oscillation frequencies of the bus voltage. The effectiveness of the method is verified by simulation.