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This paper presents a new, simple and low cost method for fast short circuit protection of IGBT modules. The principle of the method is to measure the voltage across the inductance between the power-emitter and the auxiliary-emitter. Moreover, by modulating the gate-signal, the new method reduces the gate emitter voltage Vge in order to limit the short circuit current and allows the semiconductor...
Multilevel converters are widely used in medium voltage applications. One of the most popular topologies in this field is the 18 pulses diode rectifier, which uses a mu Iti pu I so transformer that realizes a current harmonics cancelation that are generated by the three phase diode rectifiers. In this work an efficiency comparison of the aforementioned topology and a Multi-Cell Active-Front-End (AFE)...
Insulated Gate Bipolar Transistors (IGBTs) connected in series is an essential topology for high voltage applications where fast switching is required. However, the IGBTs are unlikely to share the voltage equally with each other due to many factors, such as various time-delays of control signals, different stray inductances in the circuit, and potential snubber effects [1]. Even if using identical...
Paralleled IGBTs have drawn much attention to increase current capability in high power applications. However, the current imbalance must be carefully concerned, which is caused by device characteristic difference and asymmetric circuit. In this paper, a current sharing model during turn-on period is proposed on the basis of parameterized IGBT model. The discrepancy of device parameters can lead to...
This paper deals with the development of a PSpice based evaluation platform for high power IGBT devices. The purpose of this platform is to provide useful information for the design and the assessment of converter cells for potential high power applications. An extended version of Hefner model is presented for high power, high voltage IGBTs taking into account temperature variation. A parametric analysis...
An online temperature estimation method is presented, based on a full-order state observer. To ensure the accuracy of the developed model, FEA (Finite Element Analysis) method is applied into deriving a Cauer type thermal network where the observer is modelled on. The developed observer enables estimation of temperatures at any reliability critical locations only measuring one accessible location...
Due to the possibility to drastically reduce the Solid State Transformer (SST) volume and weight, its use is becoming a reality in traction and wind power plant applications, while, in the electric distribution system, it is still considered futuristic. A SST, with managerial role in the electric distribution grid, is generally called Smart Transformer (ST). Unfortunately the low efficiency, the low...
This paper investigates the design procedure of cascaded H-bridge (CHB) and modular multilevel converter (MMC) topologies for medium-voltage and high-power industrial motor drive application. The design is performed using 1.7-kV insulated gate bipolar transistor (IGBT) technology. A model is derived for multi-pulse transformer to take into account its leakage parameters' effect on converter design...
Integrated Power Electronics Modules (IPEMs) have been developed to relieve the converter manufacturers of the burden of several discrete power devices integration. With respect to generic assemblies, modern high-end IPEMs guarantee several advantages such as high power density, low profiles and an optimal management of the wasted heat. An available model able to reproduce both electrical and thermal...
The power losses of three-level neutral-point-clamped (NPC) converters and their AC-filters with iron and amorphous core inductors designed for a bipolar low voltage direct current (LVDC) distribution network are evaluated. The main objectives of the LVDC distribution network are improved energy efficiency, power quality and reliability and higher power transmission capacity and integration of ICT...
Modern civilization depends heavily on the consumption of electrical energy for industrial, commercial, agricultural, domestic and social purposes. However, for the current HVDC system, proper protection devices and logic are not yet as mature as the AC counterpart. This paper presents the fault analysis for the protection of the HVDC (65–765 kV range) grid, using PSCAD. Faults in the DC transmission...
This paper presents a new method for balancing currents of two or more parallel-connected IGBTs during an on-state of the switches, wherein each semiconductor is controlled by its own gate unit. Moreover, the imbalance of the collector currents are estimated by measuring the voltage across the inductance between the power-emitter and the auxiliary-emitter of the semiconductor. The imbalance control...
Modern IGBT structure with a highly doped buffer layer showed a MOSFET-like behavior at low collector-emitter voltage when the gate was fully turned-on. This significantly increased the conduction loss and resulted in scrap chips. Its failure mechanism has been systematically studied in this paper to reveal the underlying device physics inside the IGBT microstructure using energy-band theory, numerical...
This paper deals with the switching behavior of a SiC MOSFET in a TO-247 package. Based on simulations, critical parasitic inductances in the circuit layout are analyzed and their effect on the switching losses highlighted. Especially the common source inductance, a critical parameter in a TO-247 package, has a major influence on the switching energy. Crucial design guidelines for an improved double...
The paper deals with control techniques for minimizing the operating loss of doubly fed induction generator based wind generation systems when providing reactive power. The proposed method achieves its goal through controlling the rotor side q-axis current in the synchronous reference frame. The formula for the control reference is explicitly deduced in this paper considering the losses of the generator,...
Transformerless (TL) topologies are employed in 1φ PV inverter topologies due to their small size and low weight. Avoiding the grid side transformer requires the modulation technique and the basis topology to be accordingly changed in order to mitigate dc current components in the grid side and the leakage current to ground. This paper carries out a sensitivity analysis of selected TL topologies....
This paper describes the design and development of a 6 kA/1.1 kV non-destructive testing system, which aims for short circuit testing of high-power IGBT modules. An ultra-low stray inductance of 37 nH is achieved in the implementation of the tester. An 100 MHz FPGA supervising unit enables 10 ns level control accuracy of the short-circuit duration, protection triggering, and acquisition of the electrical...
Cascaded power conversion system was used in battery energy storage system. It can be connected to medium-voltage grid directly and expanded to larger capacity easily. Without 50Hz booster transformer, medium voltage cascaded power conversion system can reduce power loss. In 2011, the China Southern Power Grid launched the project of 2MW/10kV battery energy storage system. In this paper, the design...
This paper presents an optimized single phase DC-AC converter with RCD snubber circuit. The proposed converter has an optimized number of levels per number of switches (nL/nS) which is by far the best relationship among the converters proposed in literature. The most important characteristics of the proposed configuration are: (i) reduced number of semiconductor devices, while keeping a high number...
The bulk materials transportation from the mines to their destination is an important activity that often represents the major part of the total mining costs. More and more frequently, high-capacity belt conveyors in mining are efficiently driven employing medium-voltage power converters connected with large induction motors. Unfortunately, medium-voltage power converters use a high number of power...
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