Voltage sourced converters (VSCs) in electric vehicle (EV) drive-trains are conventionally implemented by silicon Insulated Gate Bipolar Transistors (IGBTs) and p-i-n diodes. The emergence of SiC unipolar technologies opens up new avenues for power integration and energy conversion efficiency. This paper presents a comparative analysis between 1.2-kV SiC MOSFET/Schottky diodes and silicon IGBT/p-i-n diode technologies for EV drive-train performance. The switching performances of devices have been tested between -75 °C and 175 °C at different switching speeds modulated by a range of gate resistances. The temperature impact on the electromagnetic oscillations in SiC technologies and reverse recovery in silicon bipolar technologies is analyzed, showing improvements with increasing temperature in SiC unipolar devices whereas those of the silicon-bipolar technologies deteriorate. The measurements are used in an EV drive-train model as a three-level neutral point clamped VSC connected to an electric machine where the temperature performance, conversion efficiency and the total harmonic distortion is studied. At a given switching frequency, the SiC unipolar technologies outperform silicon bipolar technologies showing an average of 80% reduction in switching losses, 70% reduction in operating temperature and enhanced conversion efficiency. These performance enhancements can enable lighter cooling and more compact vehicle systems.

/pdf/an-evaluation-of-silicon-carbide-unipolar-technologies-for-20de2us212.pdf

An evaluation of silicon carbide unipolar technologies for electric vehicle drive-trains

As the increase of large-scale distributed generation system, the interest in the efficiency of the inverter has been higher. In this paper, the power losses are classified and calculated according to the switching states of the three level NPC inverter and three level T-type inverter. And they are compared with the results from the PSiM thermal module simulation. These power loss comparisons are carried out at the different switching frequencies and modulation index values with the different types of PWM methods. From the results, it is verified that the power loss from the T-type inverter is lower than that from the NPC inverter and it can be reduced by using the appropriate PWM method as like the DPWM method.

Power loss comparison with different PWM methods for 3L-NPC inverter and 3L-T type inverter

In this paper, power losses of 3-level NPC inverter (3LNPCI) and 3-level T-type inverter (3LTI) are classified and calculated according to the switching states. The conduction loss depends on modulation index (MI) and power factor (PF), whereas the switching loss depends on switching frequency, so the power loss analyses have been done at the different operating points of MI, PF, and switching frequency. And power losses of 3LNPCI and 3LTI with NPC and T-type inverter dedicated modules are calculated based on the theoretical formula and PSiM thermal module by using the real parameter values of switching devices. For the comparison of power losses of NPC and T-type inverters, all parameters have been referred from the data sheets of the different manufacturing companies.

Comparative analysis of power losses for 3-Level NPC and T-type inverter modules

Doubly fed induction generator (DFIG) is one of the most popular generators used nowadays in wind turbine systems (WTSs). This machine has some interesting advantages especially in variables speed applications. In the DFIG-based WTS, the rotor side of the machine is normally fed by a two-level power inverter controlled by the usual pulse width modulation (PWM) technique. This last has a principal disadvantages which is the high level of harmonic distortion. In this paper, we propose a novel technique based on space vector modulation (SVM) and fuzzy logic in order to performs the power provided by the DFIG to the grid. Simulation results show the efficiency of the proposed technique especially on the quality of the provided power comparatively to the usual PWM

/pdf/indirect-vector-control-of-a-dfig-supplied-by-a-two-level-29f37l37tf.pdf

Indirect Vector Control of a DFIG Supplied by a Two-level FSVM Inverter for Wind Turbine System

This review develop different switching methods for Multi Level Inverter (MLI). The switching methods proposed in this paper are to compare various methods and to predict exact switching method for different application based upon its quality of the outputs.  The performance of the inverter is analyzed with the parameters like THD (Total Harmonic Injection), V RMS (fundamental), CF (Crest Factor), FF (Form Factor) and DF (Distortion Factor). From the various non PWM (Pulse Width Modulation) and PWM methods the analysis are method to identify the exact PWM strategies for specific applications.

/pdf/a-review-on-modulation-strategies-of-multi-level-inverter-4f4okwzurj.pdf

A Review on Modulation Strategies of Multi Level Inverter

The paper presents the control principle for a PWM single-phase inverter, using the capabilities of 80C552 microcontroller. The basics of control program are described. How the characteristics of the presented inverter essentially depend on the features of control system, only few microcontrollers can match the necessities for high performances. One of them is Philips 80C552. The powerful T2 timer gives its useful feature in our application.

Control with microcontroller for PWM single-phase inverter

This paper deals with a novel pulse width modulation (PWM) switching strategy for a voltage source inverter through carrier modification. The proposed discontinuous sine carrier PWM (DPW ...

Pulse width Modulation Command Systems Used for the Optimization of Three Phase Inverters

The paper presents two high-performance single-phase AC chopper circuits which perform AC-AC bidirectional direct conversion;one of them contains resistive loads and the other one is for inductive loads. It includes useful equations for chopper design. The correctfunctioning is tested by simulation. DOI: http://dx.doi.org/10.5755/j01.eee.18.10.1305

/pdf/direct-ac-ac-step-down-single-phase-converter-with-improved-3e44gi0to2.pdf

Direct AC-AC Step-Down Single-Phase Converter with Improved Performances

This paper describes the implementation of a modified reference wave using discontinuous pulse width modulation DPWM-S2 technique. The number of commutations is reduced as, for two intervals of time (out of six), some transistors are in continuous conduction, and power losses in commutation should be in theory by smaller if SPWM or SVM techniques were used. Ill. 9, bibl. 8 (in English; abstracts in English, Russian and Lithuanian).

/pdf/three-phase-motor-control-using-modified-reference-wave-qp83iw31e4.pdf

Three-Phase Motor Control using Modified Reference Wave

This paper analyzes the functioning of multilevel voltage inverters with imbricated switching cells, destined for high and very high-power applications. Based on the theoretic principles, it presents the functioning of the three-phase voltage inverter with three-level imbricated cells. The simulations based on the sinusoidal PWM and DPWM control strategies yielded results that showed the main advantages of this type of inverters.

/pdf/multilevel-inverters-with-imbricated-switching-cells-pwm-and-3xj4j9540e.pdf

Multilevel Inverters with Imbricated Switching Cells, PWM and DPWM-Controlled

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