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In this paper, the design of electric protections for a controlled current source resonant converter and the corresponding experimental results are presented. This converter was designed for an induction heating current controlled system and is formed by a non-controlled rectifier, a DC-DC buck converter and a current source resonant inverter using IGBT's. The electric protections are focused to overvoltage,...
Multilevel converters offer good quality load waveforms, which is clearly beneficial to its operation. A significant drawback that affects to all multilevel topologies is the high number of components required, which is related to a high fault probability. Among all the multilevel topologies, cascade multicell converters (CM), characterized by high modularity, allow for power to be easily increased...
This paper presents the use of a predictive technique to control the currents in a PMSM, driven by a voltage source inverter. This method allows for a high quality current control without using linear controllers and modulators, resulting in a conceptually simple solution. Simulation an experimental results confirm the good performance of the drive controlled by this method.
The use of multilevel converters is widespread in medium-voltage applications due to their inherent capability to share the voltage between the power devices. More than one multilevel topology can be combined to form a single Hybrid Converter with improved capabilities. In particular, the series connection of a neutral point clamped (NPC) as a main inverter, providing the active power, and a floating...
This paper presents a predictive strategy for the control of a permanent magnet synchronous motor (PMSM). Our approach allows one to simultaneously manipulate speed and electrical variables, without using any auxiliary linear controller. The high sampling rate, characteristic of this technique, and the limited precision of the typical angle measurement devices, present serious difficulties for this...
The use of multilevel converters is widespread in medium voltage applications due to their inherent voltage sharing among the devices. Also, the multilevel offers advantages regarding the waveform quality due to the multiple steps of the output voltage waveform. This advantage is specially true for cascaded H-bridge inverters that can produce a large number of levels due to their modular structure...
This paper presents a modified predictive current control strategy which allows one to have control over the spectrum of the load current. The proposed method uses a model of the system to predict the behavior of the current for each possible voltage vector generated by the inverter. For that purpose, at each sampling interval, signal predictions are evaluated using a cost function that quantifies...
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