Abstract
Virtual inertia (VI) control of DC microgrids (DC MG) is a potential solution to the voltage stability issue caused by the intermittency of loads and renewable sources. Existing VI strategies for DC MG rely on a first-order differential equation (FODE) relating voltage (speed) with current (torque) to control the grid-forming converters that are crucial in an autonomous DC MG. However the output impedance of these converters can distort the inertial response. Existing research works overcome this by using a feed-forward controller (FFC) necessitating an accurate system model for proper compensation. Hence, in this paper, a novel VI scheme based on capacitor current control which does not rely on any differential equation is proposed. The proposed VI scheme employs a static gain to restrict the capacitor current for inertia emulation without any additional FFC. Furthermore, the proposed VI scheme is extended to parallel-connected converters to study their steady-state and transient coordination. Finally, the proposed strategy is validated in simulation using MATLAB/Simulink and is also experimentally verified in a laboratory prototype using the TMS320F280049C controller.
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