Hogan, D. J.; Gonzalez-Espin, F.; Hayes, J. G.; Lightbody, G.; Albiol-Tendillo, L.; Foley, R.

18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)

Virtual synchronous-machine control of voltage-source converters in a low-voltage microgrid

2016

October

Validated

0

Scopus: 6 ()

Distributed power generation Electric current control Machine control Power convertors Reactive power control Synchronisation Synchronous generators Voltage control Active power provision Active power regulation Active-power synchronization Apparent power 15 kVA Apparent power 90 kVA Cascaded inner-loop voltage control Distributed renewable generation Grid-tied power electronic converters Grid-tied voltage-source converter Low-voltage microgrid Microgrid frequency support Nonsynchronous power sources Outer-loop virtual synchronous machine Control scheme Output voltage regulation Power systems Reactive power provision Resonant current control Rotating synchronous generator Dynamics Static generators Synchronous-machine swing equation Three-phase VSC Voltage 400 V Voltage-source converters Capacitors Microgrids Power harmonic filters Power system dynamics Reactive power Transfer functions Ancillary Services Microgrid Vector Control Virtual Synchronous-Machine Voltage-Source Converter

1

10

In order to facilitate the further integration of distributed renewable generation into existing power systems, enhanced control schemes for grid-tied power electronic converters are necessary to ensure non-synchronous power sources can provide power and support to the grid. The virtual-synchronous-machine concept proposes the use of control schemes to enable static generators to operate with the dynamics of rotating synchronous generators. In this paper, a control scheme is presented based on the principle of active-power synchronization to regulate the active power of a grid-tied voltage-source converter based on an emulation of the synchronous-machine swing equation. Design of a cascaded inner-loop voltage and resonant current control is presented to regulate the output voltage as specified via the outer-loop virtual-machine control scheme responsible for power regulation. The performance of this control scheme is investigated within the context of microgrid operation for the provision of active and reactive power to the system, and microgrid frequency support. Experimental validation is provided via the use of a 15 kVA three-phase VSC in a 90 kVA 400V microgrid.

10.1109/EPE.2016.7695503