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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...
Proposed paper describes the implementation of a Trapezoidal Pulse Width Modulation (TPWM) technique to a single phase AC-AC frequency converter. TPWM is used to reduce the total harmonic distortion at the load output of a frequency converter. The converter can be utilized both for step up and step down operation as cyclo-inverter and cyclo-converter respectively. MATLAB/SIMULINK software environment...
In this paper, a comparative performance of a newly proposed standalone solar PV (Photo-Voltaic) power generating system is presented along with a conventional PV generating system. The new PV generating system is using isolated dc-dc Cuk converter which consists of a high frequency transformer and a conventional PV system consists of a line frequency transformer. Both these configurations are compared...
This paper introduces a efficient design a the grid side inverter for railway applications in cascaded multilevel hybrid technology. It is shown how to balance the capacitor voltages and how to dimension the capacitor size for different control strategies. Additionally the calculated power losses for this topology are determined and compared with two-level converter.
Single-phase PWM AC/DC converter used for Microgrid application has been widely tested mostly using linear loads. The behavior of the converter with the linear and static/dynamic loads need to be analyzed when it is connected to the grid, particularly with the Indian house hold power supply. This paper presents simulation and experimental results to verify the behavior of PWM AC/DC converter with...
Analysis of the temperature conditions of semiconductor power switches is an obligatory stage in design of converters of electric energy parameters. When constructing a high performance converter with a high specific power, the following procedures of development of cooling systems for a given converter are necessary: optimization of radiator profiles, calculation of optimal switching frequencies...
Induction motor drives are conventionally operated with a fixed inverter dc-link bus voltage. However, low drive speeds will result in low modulation index and poor dc bus utilization of the inverter. Aperiodic current controllers, such as hysteresis controllers, exhibit increased switching frequencies and losses for higher dc-link voltages. These high switching frequencies can be avoided by dynamically...
A bi-directional isolated DC/DC converter for medium-voltage applications have been discussed for the next-generation electrical grid, such as smart girds. To realize the DC/DC converter for installing on a power distribution system, it should be achieved higher-efficiency and lower-volume. Higher switching frequency enables to reduce the volume of the transformer. However, it is difficult to realize...
Large energy-saving effect can be expected for air conditioners that occupy the highest power consumption rate of home appliance, by introducing the SiC. In this paper, the transition of power devices, the characteristics, and the issues in widespread use, and foresight of the next generation power devices, SiC, are reported.
Traditionally, Inductive Power Transfer (IPT) systems employ an IGBT based H-bridge as the primary side converter. Consequently, these systems are not suitable for high power applications, such as fast electric vehicle (EV) charges, that require high frequency operation. This paper therefore proposes a high frequency multilevel IPT system that is suitable for high power applications. The proposed...
Single phase matrix converter has been developed to perform the functions of all operations in one converter that is a single circuit is developed that can perform cycloconverter, cycloinverter, ac voltage regulator, rectifier, inverter, chopper operations. The well-known sinusoidal pulse width modulation is used to synthesize the output. IGBT with antiparallel diode is used as a switching device...
A conventional unregulated fuel cell system requires a multi-stage operation in order to get three phase AC power supply for integration with load or grid. The output of fuel cell which is DC has to be converted into high frequency AC which has low efficiency due to high switching losses. In this paper high frequency power is regulated with the help of cascade connection of the series resonant converter...
Silicon (Si) IGBTs are widely used in railway traction converters. In the near future, Silicon Carbide (SiC) technology will push the limits of switching devices in the three directions: higher blocking voltage, higher operating temperature and higher switching speed. All in all, these large-gap components should improve the traction chain efficiency and the power-weight ratio. Thus, the topology...
Two new SMPS (a Boost and a Buck- topology) based three phase cyclo-converters are presented. Instead of using 12-SCR model, in each cycle of the input AC signal the voltage is made unidirectional by employing full bridge rectifier.To provide output voltages at opposite polarities two SMPS topology based converters (one P and one N converter) are differentially connected across the load. This newly...
One of the major trends in power electronics is increasing the switching frequencies. The advances in the frequency elevation have made it possible to reduce the total size and weight of the passive components such as capacitors, inductors and transformers in the static inverter and hence to increase the power density. The system consists of hard switched boost chopper, soft switched high frequency...
This paper proposes an improved method to describe power losses in IGBT converters. This method includes dependency of voltage, current and temperature, and it could be fast and accurate. Since the relative higher converter dissipation is one of the main barriers in high power applications, it is further compared the MVA rated three-phase IGBT converter's loss rates under different operating frequency,...
High Speed Rail (HSR) are expanding rapidly in the whole world in this decade. Almost all the high-speed trains are fed by high-voltage and are equipped with several large motors. In addition, High-speed trains have a strict restriction for both mass and size. Thus, HSR needs power semiconductors that can handle high-voltage and giant current. In addition, EMC problems become larger in these days,...
A static inverter for EMU (Electric Multiple Unit) is massive because of passive components such as high power transformers, reactors and capacitors etc. In this paper how to design and control the lightweight static inverter is proposed. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequceny transformer and rectifier. This system features a boost...
The characteristics and losses of 10-kV SiC MOSFETs, p-IGBTs and emitter turn-off thyristors (ETOs) were compared using the experimental measurements, PSPICE simulations and numerical simulations. Using the extracted loss information and method of loss calculation in the AC/DC rectifier and DC/DC converter, the frequency capability of these 10-kV SiC power devices in a 20 kVA solid-state transformer...
This paper proposes to apply an AC/AC direct converter topology for servo systems. In the conventional AC/AC converter which consists of a PWM rectifier and a PWM inverter, the p-n junction temperature becomes high at the low output frequency or the servo-lock operation because the output current concentrates at the specific switching devices in the inverter. On the other hands, the AC/AC direct converter...
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