Abstract-Low-voltage ride-through (LVRT) requirements demand wind-power plants to remain connected to the network in presence of grid-voltage dips. Most dips present positive-, negative-, and zero-sequence components. Hence, regulators based on symmetrical components are well suited to control gridconnected converters. A neutral-point-clamped topology has been considered as an active front end of a distributed power-generation system, following the trend of increasing power and voltage levels in wind-power systems. Three different current controllers based on symmetrical components and linear quadratic regulator have been considered. The performance of each controller is evaluated on LVRT requirement fulfillment, grid-current balancing, maximum grid-current value control, and oscillating power flow. Simulation and experimental results show that all three controllers meet LVRT requirements, although different system performance is found for each control approach. Therefore, controller selection depends on the system constraints and the type of preferred performance features.Index Terms-Distributed power generation, grid interface, multilevel conversion, three-level inverter, wind-power system.

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This paper presents the implementation of a Solid

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This study presents the basic features of a Monte Carlo approach for reliability evaluation of distribution systems without embedded generation using parallel computation. The test system is represented by means of a three-phase model that includes protective devices and is simulated during one year. The procedure has been implemented in an open environment in which OpenDSS is driven from MATLAB. The document includes a detailed description of the procedure, and some results derived from the simulation of an overhead distribution test system.Postprint (published version

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