An optimal power flow algorithm for unbalanced three-phase distribution grids is presented in this paper as a new tool grid planning on low voltage level. As additional equipment like electric vehicles, heat pumps or solar systems can sometimes cause flows, existing algorithms have to be adapted. In comparison considering balanced the uses complete model of four-wire grid. Additionally, constra...

This paper presents a constrained multi-objective optimisation scheme for grid-connected voltage source converter operating under unbalanced conditions in three-phase three-wire system. The is aimed at evaluating the reference currents required to supply all power generated by connected grid, whilst simultaneously suppressing oscillations of both real and reactive powers. trade-off between thes...

The presence of non-linear loads and the increasing number of distributed generation power systems (DGPS) in electrical grids contribute to change the characteristics of voltage and current waveforms in power systems, which differ from pure sinusoidal constant amplitude signals. Under these conditions advanced signal processing techniques are required for accurate measurement of electrical powe...

Improving transient voltage stability is one of the most important issues that must be provided by doubly fed induction generator (DFIG)-based wind farms (WFs) according to the grid code requirement. This paper proposes adjusted DC-link chopper based passive voltage compensator and modified transient voltage controller (MTVC) based active voltage compensator for improving transient voltage stab...

This article presents a control scheme in the stationary reference frame for static synchronous compensators (STATCOMs) that provide three features: 1) regulation of positive-sequence voltage to nominal value; 2) full cancellation negative-sequence voltage; and 3) peak limitation injected currents. These features can help improve performance these devices under perturbed grid conditions, includ...

Voltage source inverter (VSI) is a good candidate for grid forming microgrid because it provides constant amplitude, frequency, and sinusoidal shape voltage at point of common coupling (PCC). As the separated from utility grid, quality PCC easily affected by type load. To ensure power in operation, three-phase VSI providing automatic compensation unbalanced or nonlinear load presented this pape...