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This paper presents design and control a suitable power electronics transformer (Solid State Transformer, SST) that is suitable for applying to be application in solar farm in Thailand by using Power Simulation Version 9.1 (PSIM 9.1). SmartCtrl is a toolbox of the PSIM 9.1 program that is used to design PI controllers and find the optimal gain automatically. The advantages of designing a controller...
We developed a gate driver IC that can power IGBTs of up to 500 amperes for HEVs and EVs. A newly developed Zener clamping circuit effectively suppressed the IGBT spike voltage in short circuit (SC) mode. The silicon-on-insulator (SOI) process was utilized to achieve high temperature operation and high surge protection.
In this paper, the conventional three-level diode-neutral-point-clamping (3L-DNPC) inverter is deeply investigated from the view of power loss. It is concluded that the conventional 3L-DNPC inverter has high zero-vector conduction loss due to clamping Diode+ IGBT structure's high on-state voltage, high clamping diode reverse recovery loss and so on. Therefore, the clamping diodes are most deeply related...
The latest trend in solar inverter application is to increase DC link voltage to 1500VDC for high power output. This paper describes a design concept of NPC1 power stack for 1500VDC megawatt level solar inverter. This stack uses three latest half-bridge IGBT modules with highest power density and operation junction temperature, which enable realization of power level beyond 1MW without paralleling...
There is currently an ongoing effort to promote the installation of low power, residential and commercial, DC microgrids, which allow the incorporation of renewable energy sources (RES) into local generation systems. Since it is intended that RES generate as much energy as possible, and often this energy is not consumed locally, a common practice is to inject the surplus energy into the grid to ensure...
The conventional structure of buck-boost inverter uses IGBTs. IGBTs have features like long tail current, fixed voltage drop and that is why its switching losses are high. In this paper switching cells structured buck-boost inverter is proposed. In switching cell structure, MOSFETs and external diodes with very fast reverse recovery characteristics are used, while the body diodes have no chance of...
This article presents the efficiency analysis of a 5 MW wind turbine generating system in an all-DC wind park 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 NPC converter and DC-DC converter with an optimized high-frequency transformer. The total efficiency through...
In this paper, a novel topology of two-level voltage-type inverter is proposed. The proposed inverter has three bridge arms while each bridge is made up of 2 thyristors, 1 IGBT and 4 diodes. Thyristors complete the phase positioning of the inverter, IGBT completes the modulation of different modulation modes such as SPWM, SVPWM, and SHPWM, and the diodes complete the commutation of the bridge arms...
In this study, a mode transition scheme between a single phase half bridge 2-level voltage source converter (VSC) and a 3-level T-type VSC is proposed. The efficiency of 3-level T-type VSC can be increased by the mode transition scheme. The mode transition scheme select the efficient operation method between a 2-level and 3-level VSC. The 2-level VSC or 3-level VSC operation method are selected depending...
Topology of the multicell multilevel inverters are one of the most promising power converter topologies being successfully commercialized in the high-power market. This paper proposes a new cascaded multicell multilevel converter with a reduced count of power switches. The proposed reduced-switch-count multilevel is formed by connecting two distinct power conversion stages through two low-frequency...
Transformerless inverters are widely employed in PV grid-tied inverter due to their capability of reducing power losses and enhancing the system efficiency. Several multilevel transformerless topologies are investigated to increase power quality and system efficiency. Wide bandgap power devices such as SiC MOSFETs can increase the system performance and reduce the total losses due to their superior...
Multicarrier pulse width modulation (MC-PWM) techniques such as Level-shifted PWM (LS-PWM) and Phase-shifted PWM (PS-PWM) are the popular methods to control the output voltage of Multilevel Inverters (MLIs). The advantage of LS-PWM techniques over PS-PWMs is that they produce better harmonic profile, but the un-equal power distribution problem of LS-PWMs imposes limitation to their usage in high power...
Compared with single-side cooling inverter, double-side cooling inverter is more advantageous for the application of electric vehicle in terms of efficient cooling performance, mechanical robustness and high power density. IGBT short-circuit fault is one of the detrimental factors to cause the whole inverter failure. From the perspective of inverter, this paper analyzed the fault condition of single...
This paper proposes a dual fed common dc link inverter Open End Winding-Permanent Magnet Synchronous Motor (OEW-PMSM) Drive. In order to increase the system efficiency a dual technology converter is used, with one inverter composed of standard IGBT devices and the other composed of fast switching Silicon Carbide (SiC) devices. The common dc link OEW configuration allows the zero-sequence current (ZSC)...
The purpose of this paper is to estimate the efficiency of the inverter circuits used for the Photovoltaic (PV) systems. The analysis of a power electronics converter with the SPICE during the steady-state operation takes a long time and the results may not be obtained accurately due to convergence problem in the solver. The MATLAB package program is widely preferred to analyze the power electronics...
This paper work addresses the enhancement of this technique by associating it the polar coordinates as a proposed tool for a better detection and location of the faulty inverter switch. The proposed use of the polar coordinates tool not only allows the exact computation of both the magnitude and the phase angle values of the fault current vector allied to the faulty inverter IGBT but also enables...
In the last decades, the interest in solar photovoltaic (PV) energy has increased considerable around the world. That are many publications that focus on the temperature assessment of PV modules and solar heat collectors but fewer discuss the temperature and reliability evaluation of PV-inverters components. IGBT power modules are the key components from the reliability point of view. Some solar power...
The need to maximize performance indicators and minimize associated costs in industries has led to the intense automation in this scenario, while diverse equipment is employed for this purpose. Adjustable speed drives (ASDs) are quite relevant in many industrial applications as it is possible to control torque and speed in either single-phase or three-phase induction motors accurately. Among the existing...
This paper presents the integration of the photovoltaic panels which are modeled in the Matlab/Simulink to the smart grid using a 6-switched 3-level inverter. The system generates electricity by photovoltaic panels and feed load via 6-switched 3-level inverter. To reduce harmonics in the system and increase the quality of the generated signal, 6-switched 3-level inverter, which is contain an alternative...
The current-limiting mode of inverters raises the problem of severely restricted fault currents and brings challenges to overcurrent protection. This paper provides an overview of the concept for inverter dominated distribution systems and then discusses its characteristics with respect to overcurrent protection comparing to traditional networks. Based on the overcurrent protection scheme, it is considered...
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