This paper suggests a new control method to modify the virtual impedance performance in unbalanced conditions. The proposed method compensates the voltage drop that occurred due to the virtual impedance and adjusts the voltage of the point of common coupling at a desirable level. To compensate the voltage drop, the reference voltage in the droop control varies according to the proposed algorith...

Grid integration of renewable energy systems with majority which is variable dc and ac. For example, solar output dc, while wind Power electronics now plays a significant role in the DC AC conversion required for grid. allows dc-coupled to be controlled both active reactive power, making inductively improving power quality synchronizing systems. The presence harmonics electrical indicates that ...

The article presents a new approach to positive and negative sequence current vector control of grid-connected three-phase three-wire power electronic converter operating under grid voltage imbalance conditions. concept utilizes the representation unbalanced in coordinates frame which components are constant. nonlinear trigonometric transformation two-dimensional from stationary is found online...

The paper presents a summary of different double second-order generalized integrator (DSOGI)-based phase-locked loop (PLL) algorithms for synchronization with three-phase weak grids. methods are compared through simulation under variety grid conditions, such as unbalanced phase voltages, high low-order harmonics distortion, frequency steps, jumps, and voltage sags. Following the results, three ...

In this paper, we evaluate message-passing applications in Grid environments using domain decomposition technique. We compare two domain decomposition strategies: a balanced and unbalanced one. The balanced strategy is commonly strategy used in homogenous computing environment. This strategy presents some problems related with the larger communication latency in Grid environments. We propose an...

The unbalanced voltages cause negative effects on the doubly fed induction generator (DFIG) such as torque pulsation and increased stator current. Based on the symmetrical component theory, the torque pulsation is the consequence of the interaction of stator and rotor currents of different sequences. This paper presents a control technique to reduce the effect of unbalanced voltages on the DFIG...

A resonant sliding mode control strategy based on the film surface is proposed to turbine-side converter of wind turbine so that can be connected grid smoothly under condition unbalanced voltage. Taking doubly-fed asynchronous generator working voltage as object, establish its mathematical model and generator-side converter. instantaneous power in ? ? static coordinate system state variable con...