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We developed 3.3kV All-SiC power module on which SiC-MOSFET and SiC-SBD were mounted for electric power distribution apparatus. This power module has characteristic structure of pin-connections and resin-molded. Total switching loss of the module is lower than the module which mounted Si-IGBT and Si-FWD more than 60 percent.
Permanent magnet synchronous motor (PMSM) drives include several design and control variables that affect power losses. The improvement in system efficiency through control techniques will reduce the size of inverter and motor cooling system as well as the operating costs of the system. This paper proposes a comprehensive analysis of loss controllability using various control parameters to reduce...
This work investigates maximum efficiency control strategies of permanent magnet (PM) traction machine drives that are adopted in General Motors (GM) hybrid and electric vehicles. First, three different current vector control techniques, Maximum Torque Per Ampere (MTPA), Maximum Torque Per Motor Loss (MTPML), and Maximum Torque Per System Loss (MTPSL), are presented to identify the most attractive...
This paper proposes a general space-vector (SV) modulation method for the optimal on-line reduction of the switching losses in any n-multilevel inverter. The proposed method consists of two steps. One is a general principle for generation of the SV map for an arbitrary n-level type to utilize redundant SVs. The other is the optimal selection of the SV pattern which minimizes the switching losses considering...
This paper proposes an improved phase-shifted pulse-width modulation (PS-PWM) method for a three-phase cascaded H-bridge (CBH) multi-level inverter. In the proposed PS-PWM method, the switches at one leg of H-bridge cell (HBC) only operate and the switches at other leg are clamped. Therefore, the number of the multi-carrier signals depending on the voltage level can be reduced in half compared to...
Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents voltage stress reduction on switches for the same DC-link...
Mobile power substations (MPSs) are optimally designed to be installed on a truck bed for ease of transportation in order to provide an interface between two medium-voltage distribution systems under emergency or maintenance conditions. Based on the solid-state transformer (SST), a topology of N-series modules concept is proposed for MPS. The average control methods are used to balance the voltage...
Wireless charger for Electric Vehicles (EVs) is an off-line application and it needs power factor correction (PFC) function, which usually consists of a front-end boost PFC and a cascaded DC/DC converter. Recently, Z-source resonant converter (ZSRC), a single-stage solution with low cost and high efficiency, was proposed for EV wireless charger. Combining with the Z-source network, the control scheme...
This paper presents the analysis of harmonic and switching loss for two-level space vector based pulse width modulation (PWM) schemes. The harmonic performance of the inverter is evaluated through weighted voltage total harmonic distortion for different modulation indices. To calculate switching loss, analytical expressions for switching instants are generated by comparing the triangular carrier signal...
This paper proposes the modeling of single phase symmetric flying capacitor multilevel inverter (SFC-MLI) for Static synchronous compensator (STATCOM) application. The proposed topology is composed of cascade-connected five-level SFC modules. The linear current controller with phase shifted and phase disposition pulse-width modulation (PS-PD-PWM) base switching technique has been implemented. To takes...
This paper proposes the pulse width modulation (PWM) technique for the five-phase open-end winding induction motor (FPOEWIM) drive fed from five-phase dual inverter (FPDI) with a single dc source. The selected method gives the advantages of reduced switching losses specifically for induction motor drives working with higher power factors with the elimination of common-mode current (CMC). The method...
Multi-level topologies reduce the requirements on inductors and filters, however, given the high number of series connected semiconductors, it is still unclear if they are a suitable option to achieve ultra-high efficiency while maintaining a reasonable power density. For this purpose, an extensive quantitative evaluation of different topologies is carried out, to determine the required volume for...
For LCL type grid-tied three-phase inverters, a model predictive controller is proposed. Through the controller, system performance indexes, i.e., current tracking, inductor loss, switching loss can be combined and then optimized. Since the controller is a constrained nonlinear problem, an on-line algorithm is presented which is based on branching and bounding method. Finally, through Matlab simulation...
This article presents the losses of a 5 MW wind turbine generating system comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the classical 2-level converter and the NPC converter. Their inverter losses using three types of modules were calculated and compared.
The efficiency of the electric powertrain has a direct influence on the cost and range of electric vehicles, which are the two key factors hindering the public acceptance of electric vehicles (EVs). Inverters, as an important component of the electric powertrain, have a high efficiency at full load, but an unsatisfying performance at partial load due to the bipolar characteristics of IGBT. To improve...
In near future, modern aircrafts will be more electrical, having more power converters in different applications. Inverters is one of the most common applications, which are used in actuators, cabin pressurization, among others. In order to significantly reduce weight, size and losses of these converters, disruptive technology such as Wide Bandgap components (SiC and GaN transistors) should be used...
SiC power devices offer a good chance to improve performance of impedance source converters; however, new challenges must be met. This paper presents a study on phenomena occurring due to parasitic capacitances of inductors in a high-frequency quasi-Z-source inverter. Rapid changes of voltage values caused by new, fast-switching SiC MOSFETs and Schottky diodes make this issue important. Negative influence...
This paper presents a new mathematical model for the power losses of the PV inverters for various PFs using the datasheet of the PV inverter manufacturer and basic knowledge of power electronics and semi-conductors. The mathematical model uses as parameters the input and output power of the inverter, the PF (inductive or capacitive), which the inverter operates at, and the efficiency curve of the...
In this paper, a novel DC-link voltage variation method using a high-efficiency dc-dc converter for the three-phase-inverter of IPMSM(Interior Permanent Magnet Synchronous Motor) is proposed. The proper variation method of DC-link voltage is needed to reduce the torque ripple of IPMSM and, switching loss of the inverter. Also, to meet the high-efficiency requirement of the DC-DC converter with the...
At present, the SiC devices have been widely concerned with the excellent characteristics of low switching losses, which can significantly improve the frequency of power electronic converters, and also have broad application prospects in the field of rail transportation. In this paper, through the establishment of 1500V powered subway auxiliary inverter loss model, the author estimated loss and efficiency...
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