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this paper presents the design, simulation and experimental performance of a scaled-down advanced DC-DC converter prototype. The configuration uses soft-switching and combines a resonant circuit with a boost converter resulting in a voltage-gain of 10 and. Through a cascade arrangement of converters, the voltage gain is increased to 50. The DC-DC converter is primarily designed as converter station...
The emerging Modular Multilevel Converters (MMC) technology is expected to play a key role in the construction of DC grids and integration of renewable energy sources (RESs) at bulk to medium and high voltage. The DC option is also perceived as solution to the steady increase in power demand and the collection of disperse conventional and variable generations. These can be achieved while maintaining...
A novel two-degree-of-freedom internal model control (IMC) controller that improves the fault ride-through (FRT) capabilities and crowbar dynamics of doubly fed induction generator (DFIG) wind turbines is presented. As opposed to other control strategies available in the open literature, the proposed IMC controller takes into account the power limit characteristic of the DFIG back-to-back converters...
Voltage sags, swells and harmonic distortion are three of the more representative PQ events in distribution grids. For mitigating such events various AC-AC- and AC-link structures has been proposed over the years with greater or lesser success for ameliorating large voltage deviation events. This paper introduces the DVR-AC (Dynamic Voltage Restorer-Alternate Current), a novel power electronics-based...
This paper introduces a new transformerless multilevel topology for PV arrays systems. The 7-levels structure ensembles the best characteristics of three basic topologies to obtain a step-up DC-AC converter with only a single DC input and nine power switches. The advantages of the proposed structure are a higher power density, lower harmonic distortion and higher efficiency as no transformer is needed...
This work presents the design and implementation of a control system for a thyristorized rectifier bridge held by PSoC (Programmable System-on-Chip), which is able to maintain the output current of the circuit in a predetermined reference supporting changes in input voltage, as well as changes in load. Using the PSoC - an integrated circuit that has programmable analog and digital resources - it is...
This paper presents the design and construction of a scaled-down arbitrary waveform power source which bases the synthesis of power signals at its output in two H converters multilevel with asymmetric sources in cascade. The aim of the power source is to mimic the disturbance-like signal for testing controls, instruments and electric devices and equipment in real-time. The electrical disturbances...
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