An increasing intake of grid-connected inverters could change the characteristics low voltage networks including equivalent grid impedance seen by each inverter at its point common coupling. This can impact overall performance inverters, and thus it becomes necessary for to estimate online. However, there are some challenges when comes estimation using inverters. These include accuracy associat...

High penetration of distributed generations and active loads have enabled the power electronics converter to become a vital component in modern grid system, broad employment grid-connected converters at various levels is making impedance characteristics complicated. Consequently, order validate more advanced features such as reliability stability performances converters, it becoming an emerging...

A triangular grid graph is a finite induced subgraph of the infinite graph associated with the two-dimensional triangular grid. We show that the problem Hamiltonian Cycle is NP-complete for triangular grid graphs, while a hamiltonian cycle in connected, locally connected triangular grid graph can be found in polynomial time. 2000 Mathematics Subject Classification: 05C38 (05C45, 68Q25).

This paper proposes an improved direct active and reactive power control (DPC) strategy for a grid-connected doubly fed induction generator (DFIG) based wind-turbine system under unbalanced grid voltage condition. The method produces required rotor voltage references based on the sliding mode control (SMC) approach in stationary reference frame, without the requirement of synchronous coordinate...

This paper presents a new approach for PLL for synchronization with the public grid phase and frequency of grid-connected single phase inverter. The approach uses trigonometric transformations of the inverter output voltage and the grid voltage. The proposed mathematical model is then studied by means of computer simulation for different voltage amplitudes of the grid voltage as well as the inv...