Investigation on the Combined Effect of VSC-Based Sources and Synchronous Condensers Under Grid Unbalanced Faults

Abstract

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Unbalance mitigation strategies in microgrids

“…Shabestary and Mohamed [287] compared the maximum allowable support control schemes for the performance under unbalances and concludes that the balanced positive sequence current strategy has the lowest maximum current. LVRT techniques based on positive-sequence and NS current injection are discussed in [288], while Jia et al [289] carried out investigations on the short-circuit responses of a combination of DGs and synchronous condensers and proposed FRT schemes for the same. A generalised control scheme and control algorithms for control parameters tuning have been discussed in [290] for grid fault control and an adaptive notch filter-based multi-purpose control scheme for a four-leg GCI is discussed in [291] for achieving good power quality.…”

“…5 shows a typical control scheme for the grid‐connected mode involving a secondary communication‐based layer. This section summarises the available literature [14, 15, 16, 17, 20, 24, 26, 162, 219, 226–366] on unbalance mitigation in the grid‐connected scenario of both single and multiple inverters.…”

Start-Up Control and Grid Integration Characteristics of 300 MVar Synchronous Condenser With Voltage Sourced Converter-Based SFC

“…However, the grid integration of SC with different frequency differences was not discussed. The combined effect of VSC-based sources and SCs under grid unbalanced faults considering two groups of VSC fault-ride-through control strategies was investigated in [16]. It aimed to provide an evaluation of the different control strategies and to explore the impact of equipping a SC at the point of common coupling.…”

Grid–Following DVI–Based Converter Operating in Weak Grids for Enhancing Frequency Stability

“…A plethora of mechanisms have been proposed for inertia emulation (also known as virtual or synthetic inertia) through a variety of devices [7]− [17], ranging from synchronous condensers to VSCs control. Reference [7] suggests employing synchronous condensers at the PoI of VSC−based sources, resulting in slower frequency dynamics. Synchronverter, an inverter that mimics SGs, has been proposed in [8].…”