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The aim of this paper is to present an approach that improves the proposal based on the complete dynamical model by Ko??mu??rcu??gil and Ku??krer. This control scheme works in the stationary frame and does not need to measure the input line currents, but it is sensitive to variations in the value of the line inductances. This paper proposes a method based on a Fuzzy Logic Controller (FLC) that uses...
The paper presents simulation of multilevel PWM front-end converter based on 5-level flying capacitor (FLC) modules for an AC traction application. Two possibilities of parallel connected FLC modules with common and separated DC bus (where each module can provide different DC voltage level) have been analyzed in this paper. Several simulations are presented for both solutions, what confirm usefulness...
The paper presents simulation of single-phase cascade multilevel PWM converter topology based on 5-level flying-capacitor (FLC) modules. The cascaded solution provides a high number of output levels and high modularity (power electronics building blocks - PEBB), what gives possibility for flexible operation of converter at various high voltage and high power conditions. Several simulation results...
Paper presents simulation of novel single-phase cascade multilevel PWM converter topology. Solution is based on series connection of 5-level FLC modules, what gives possibility for flexible operation of converter at various high voltage and high power conditions. The new cascaded solution provide a high number of output levels and high modularity (Power Electronics Building Blocks-PEBB). Moreover...
This paper presents implementation of system for variable-speed wind turbine based on permanent magnet synchronous generator (PMSG). System consists of six-pulse diode rectifier, dc/dc boost converter and 3-level neutral point clamped (npc) converter. Control scheme is mainly based on active and reactive power loops and contains following additional blocks: virtual flux and filter-capacitor voltage...
This paper proposes an advanced control of three-phase three-level neutral point clamped (3L-NPC) PWM converter connecting a parallel connected generators to a grid. Control scheme is mainly based on active and reactive power loops and contains following additional blocks: virtual flux and filter-capacitor voltage estimators for sensorless operation, active damping (AD) of possible resonances in LCL...
This paper proposes a simple concept of space vector modulation (SVM), which reduces switching losses in three-phase three-level neutral point clamped (3L-NPC) PWM inverter. This is achieved by using less number of vectors in sampling time as well as proper selection of zero vectors by peak of current tracking. The theoretical principles of this method and modulation algorithm are discussed. Simulation...
Three-phase PWM (active) rectifiers are connected to the line power through inductance or LCL filter. LCL filter is more effective (better attenuates switching harmonics), however such solution causes stability problems. In order to assure stable operation either a damping resistor or active damping algorithm has to be used. However, extra resistor causes additional losses and active damping algorithm...
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