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ISOV (Input Series Output Parallel) modular DAB (Dual Active Bridge) converter based topologies have been mostly considered for solid-state transformer (SST) based power substation design, involving multilevel converters at the medium-voltage side. As DAB converter is one of the core components of this topology, an important question to address is thus the freewheeling currents of DAB which increases...
In this paper study on solid-state medium-frequency transformer isolated substation is modeled in detail. The substation is formed by AC/DC rectifier, six-pulse DC/AC inverter, high-frequency transformer, DC/AC six-diode rectifier and DC/AC inverter. Both AC/DC rectifier at high AC grid-1 side and DC/AC inverter at lower grid-2 side are controlled by proportional resonant controller and are interfaced...
Microgrid with multiple grid-connected inverters produces abundant harmonic voltage and current components. Such harmonics make it difficult to extract fundamental component and other useful components. Accurate yet time-efficient algorithm is in high demand to solve this problem not only for producing accurate reference signals but also for fulfilling effective control and event detection in microgrid...
This paper presents a design and optimization method to harness wind energy using PMSG, diode rectifier, boost DC/DC converter and grid-connected VSI DC/AC inverter with LCL filter. A systematic procedure has been adopted to design the system to extract maximum power for a given wind speed. The design methodology has been verified by Simulink based platform. The system operates up to its design target,...
In this paper differential evolution algorithm has been adopted to identify a suitable set of values of L-C-L filter used in a grid-tied voltage source inverter to meet total harmonic distortion (THD) requirement. A single-phase circuit model with virtual equivalent impedance of inverter output power was used to analyze total harmonic distortion. This paper also adopted a combination of partial direct-pole-placement...
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