Voltage sag assessment method considering low-voltage ride-through of inverter-interfaced distributed generators

Voltage sag assessment method considering low-voltage ride-through of inverter-interfaced distributed generators

Blog Article

Voltage sags often disrupt the normal functioning of sensitive equipment and distributed generators (DGs), making voltage sag mitigation based on corresponding assessments crucial.Voltage sag characteristics, including voltage magnitude and sag duration, are affected by the low-voltage ride-through (LVRT) requirement of inverter-interfaced distributed generators (IIDGs).Moreover, voltage sags inversely affect the tripping behavior of IIDGs.

However, inadequate analysis of the mutual effect of IIDGs and voltage read more sags degrades the performance of voltage sag assessment.To address this issue, the current study proposes a voltage sag assessment method considering the LVRT of IIDGs, where voltage sag characteristics are calculated in two modules.In the first module, given the nonlinear relationship between the fault current and terminal voltage of an IIDG in LVRT, voltage magnitude calculation is performed iteratively, where the computational cost is reduced by an adaptive partitioned iterative model.

In the second module, the tripping behavior of different IIDGs is analyzed according to the ride-through time estimation model.Finally, the olea europaea montra voltage sag assessment result is obtained by modifying voltage magnitude under different estimated trip behaviors.The effectiveness and reliability of the proposed method are validated by considering various test systems and IIDG penetration extents.

The results demonstrate the superiority of the proposed voltage sag assessment method over traditional methods in terms of accuracy and efficiency.