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The use of a model predictive control algorithm to reduce the losses in a 3L-NPC inverter with SiC neutral point diodes was investigated. It considers the reduced switching losses associated with the commutations that involve a SiC diode. A loss reduction of 5% is achieved compared to a standard sine-triangle modulation.
For drive train efficiency estimation, three-level inverters are analyzed regarding different modulation techniques and switching frequencies. In this paper an optimized operating mode selector is proposed to choose a loss optimal modulation technique and switching frequency for each operating point. Energy savings due to the operating mode selector are validated on a driving cycle.
Multilevel inverter topologies are an alternative for a wide range of low voltage electrical drives. They can reduce power semiconductor losses, voltage transients at the motor windings, harmonic losses in the cables and common mode disturbance currents. In the voltage range below 1000 V highly optimized switches with lower losses are available. The paper compares the component losses (power semiconductor...
Presented here is a three level voltage source inverter for electric drives, uninterruptable power supplies and for mains feeds. Unlike the usual hard switching topologies, it is implemented as completely soft switching. A novel patented snubber circuit is added, which is structured very simply and consists of only a few passive components. This snubber circuit works in principle without any losses;...
Multilevel inverter topologies are an alternative for a wide range of low voltage electrical drives. In the low voltage range (<1000 V) highly optimised switches with lower conduction and switching losses are available. For 550 V DC link voltage the power semiconductor losses of a two-level VSI with 1200 V-IGBT and a neutral-point-clamped three-level VSI in the power range between 7 to 35 kW are...
Multilevel converters are used in medium voltage high power applications. In this field, switching losses are an important efficiency issue due to long term operation costs. Previous works have centered the analysis in comparing different topologies or semiconductors in relation to switching losses. However, switching loses are closely related to the modulation method employed to control the converter...
The grid-connected photovoltaic (PV) systems are an important part of renewable energy sources and their integration is getting more and more widespread. In order to improve the efficiency, practicality and reliability of the PV systems, many kinds of new inverter topologies have been proposed to avoid using a grid isolation transformer. The NPC topology and two other derived topologies are presented...
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