Control of active and reactive powers in three phase inverters for grid-tied photovoltaic systems under unbalanced voltages

Unbalance mitigation strategies in microgrids

“…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, on unbalance mitigation in the gridconnected scenario of both single and multiple inverters. A current source inverter (CSI) is proposed in [227] to achieve good performance under unbalance using direct control with reduced sensors and no PLL.…”

“…An adjustable strategy for eliminating real or reactive power oscillations is described in [292], while Kabiri et al [293] proposed a simplified extraction method for control under unbalances eliminating sequence extraction. A strategy to inject balanced currents to the grid despite the VUs is presented in [20], while Kumar and Mishra [294] proposed an instantaneous symmetrical component theory-based control neutral clamped three-leg VSI for superior unbalance performance. A coordinated control strategy for parallel GCIs is discussed in [295] for peak current limitation, while Yarmohamad et al [296] proposed a four-wire DSTATCOM for unbalance mitigation.…”

“…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.…”