@PHDTHESIS{ 2025:2122417945,
 	title = {CONTROL OF INTERNAL LOOPS IN CONVERTERS OPERATING AS VIRTUAL SYNCHRONOUS MACHINES FOR IMPROVED DYNAMIC RESPONSE},
 	year = {2025},
 	url = "https://tedebc.ufma.br/jspui/handle/tede/6591",
 	abstract = "The increasing integration of renewable energy sources into modern power systems, driven
 by environmental concerns and the global pursuit of sustainable energy, has significantly
 transformed the power generation landscape. In this context, inverter-based resources have
 become essential for interfacing renewable energy sources with the grid. These inverter-based
 resources are typically controlled using either grid-following or grid-forming strategies. While
 grid-following inverters rely on phase-locked loops and require an external voltage source for
 synchronization, grid-forming inverters can independently establish voltage and frequency
 references, making them suitable for both grid-connected and islanded microgrid operations.
 Among various grid-forming strategies, virtual synchronous machines stand out for their
 ability to emulate the inertial and damping behavior of traditional synchronous generators. This
 enables more robust system dynamics in grids with high renewable energy sources penetration and
 low inertia. Virtual synchronous machines-based inverters offer the capability to support voltage
 and frequency regulation while operating autonomously or in coordination with the main grid.
 This thesis proposes the design and refinement of the inner control loops of a virtual
 synchronous machine-based inverter, aiming to enhance power system stability and dynamic
 response. Specifically, a current controller is developed to provide high bandwidth, attenuate LCL
 filter resonance, and improve disturbance rejection. A voltage controller with disturbance input
 decoupling is also introduced to improve the virtual synchronous machine dynamic response. With
 the designed inner control loops, the virtual synchronous machine exhibits enhanced dynamic
 performance when connected to the grid across a wide range of short circuit ratios, as well as
 during load variations in islanded mode. The virtual synchronous machine also exhibits improved
 performance when operating in a microgrid, both in coordination with a grid-following inverter
 and when running in parallel with another virtual synchronous machine.
 In general, this thesis aims to improve the inner control loops of a virtual synchronous
 machine, enabling it to serve as an effective power control strategy in electrical systems that are
 increasingly dominated by inverter-based resources.",
 	publisher = {Universidade Federal do Maranhão},
 	scholl = {PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA DE ELETRICIDADE/CCET},
 	note = {COORDENAÇÃO DO CURSO DE ENGENHARIA ELÉTRICA/CCET}
}