Voltage Derivative-Based SMES Mitigation Scheme for Multi-Pumping Motor in DC Microgrid

The multiple beam pumping motors (BPMs) DC microgrid enables energy inter-feeding between motors. However, conventional voltage regulation method for this kinds of DC microgrid is achieved by voltage-threshold-based coordinated control, which suffers from response lag. To overcome the limitations of existing rule-based control methods, this paper proposed a voltage derivative-based control scheme to maintain DC bus voltage under AC faults and the load fluctuations of BPMS. First, the capacity calculation method of superconducting magnetic energy storage (SMES) is given by analyzing the possible regenerative braking energy from motor loads. Then, a voltage derivative-based coordination control strategy and reference power calculation method for SMES is proposed. Compared simulation results obtained in MATLAB/Simulink leverages the fast response characteristics of SMES to mitigate voltage fluctuations.