Improving the performance of grid-connected voltage-sourced inverters under unbalanced network conditions using a fuzzy sliding mode-based approach

Unbalance mitigation strategies in microgrids

“…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. SMC is modified by adding a fuzzy function in [297] for grid-connected VSI and a controller is designed in [298] for the simultaneous injection of both the current sequences into the grid. Other approaches under unbalanced grid conditions include an integrated controller for enhanced LVRT control in [299], injection of NS currents under sags in [300], neural network-based least mean sixth CC technique in [301], cascaded three-loop current controller in [302,303], new algorithms for RCG under unbalances in [304], proper regulation in terms of the high voltage ride through in [305], PR-based compensation controller in [306], control of multi-functional four-wire DGs in [307,308], and a simultaneous harmonic and unbalance compensation control in [309].…”

“…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.…”