Abstract
Low voltage ride through (LVRT) is one of the indispensable issues of recent decade in the context of grid codes. LVRT stands for the ability of a generation facility to stay connected during the voltage dip. Despite the numerous discussions in recent works, but they mostly concentrate on the LVRT-based control of distributed energy resources (DERs) integrated into a microgrid and its improvement. However, what has been hidden and not addressed any more yet is an index to measure the LVRT capability of a DER-penetrated distribution network (DPDN) under different voltage sags. This takes precedence when we want to evaluate the LVRT capability of DPDNs with consideration of various LVRT categories of DERs mandated in IEEE 1547 standard. This paper introduces a general framework for LVRT assessment of a DPDN by solving a system of differential algebraic equations (DAEs). Then expected LVRT capability of a DPDN is evaluated by a proposed LVRT index through the implementation of Monte Carlo simulation technique.
Highlights
Low voltage ride-through (LVRT) concept accounts as one of the ride-through capability of distributed energy resources (DERs) in abnormal operation conditions, considered in the power system grid codes
Since the buses including DERs with LVRT capability are sensitive to the depth of voltage sag, Ref. [32] has addressed a new method based on bisection search, which determines the areas of fault occurrence do not trigger the LVRT performance for these DERs
The primary purpose of this paper is to first give a mathematical model based on the system of differential algebraic equations (DAEs) to see the LVRT-based behavior of a DER-penetrated distribution network (DPDN) during voltage sag
Summary
Low voltage ride-through (LVRT) concept accounts as one of the ride-through capability of distributed energy resources (DERs) in abnormal operation conditions, considered in the power system grid codes. [32] has addressed a new method based on bisection search, which determines the areas of fault occurrence do not trigger the LVRT performance for these DERs. Since the buses including DERs with LVRT capability are sensitive to the depth of voltage sag, Ref. [33] has just addressed the penetration level impact on voltage instability of a PV-penetrated distribution network and its LVRT capability These works have not discussed the conditions of the network that cause the failure of DERs in riding through the short term voltage drop of the PCC.
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