The ability to maintain the power balance, and effectively share the demand power among the available generating units is one of the essential requirements of a dc shipboard microgrid. When multiple power sources participate in the voltage regulation of a common dc-bus, droop control is typically used and a steady-state error in the voltage cannot be avoided. This work investigates a distributed control strategy inspired by the cross-current compensation technique, originally developed for ac power plants, that allows to eliminate the steady-state voltage error while enforcing the current sharing. The sources participating in the voltage regulation are equipped with a cascading controller where the outer voltage control loop, fed with the compensated voltage measurement, generates the reference signal for the inner current control loop. Control equations are developed, and a set of real-time simulations is performed. Results show that the proposed control strategy is effective in eliminating the steady-state voltage error and ensuring current sharing. Moreover, the control strategy exhibits a fail-safe behavior that allows the system to remain stable even in the event of compensation failure.
A Cross-Current Compensation Control Scheme to Improve Voltage Regulation and Power Sharing in DC Shipboard Microgrids
2023-08-01
4189570 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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