The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multilevel inverters as the best existing solution for high power/ medium voltage applications have been utilized to incorporate renewable energy sources into electric grid. Solar energy, and fuel-cells as two major sources of power can only provide unidirectional power flow. However, utilizing cascaded H-bridge inverters or other inverters with trinary voltage ratios at the input DC links might cause...
In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
This paper presents an approach to completely eliminate common-mode voltage (CMV) of an AC motor fed by a three-level neutral point clamped (NPC) inverter. CMV is produced at the star point of an AC machine fed from the inverter. Its parasitic coupling with the motor frame has a negative effect on the motor itself and other equipment, particularly in underground environment. The proposed approach...
The increasing penetration of electric vehicles (EVs) will bring great challenges to the secure and economic operation of distribution networks. On the other hand, coordinated charging of EVs can alleviate the adverse impacts of charging loads and even increase the efficiency of distribution network operation. This paper aims at optimally scheduling the daily charging of EVs and the daily on/off switching...
The power electronic based Grid Side Converter (GSC) is the key technology for interconnecting RES. In order to obtain accurate simulation results, it is important to have a detailed-realistic modelling of GSCs. This requires a very small solver step (i.e., solver period near 1 μs) due to the high-frequency switching operation of these converters. Such a small solver period imposes computational constraints,...
The Y-source converter is one of the recent proposed impedance source converters. It has some advantages as having a high voltage gain between the input and output voltage sides using very small duty cycle ratios. For many applications, the input voltage needs to be boosted to higher output voltage, such as for fuel cell, battery electric vehicles and renewable energy applications. Understanding the...
The method of modeling of the SEPIC converter power part in the MicroCap program based on the creation and study of pulse and continuous converter models is considered in this paper. The aim of the pulse model research is to determine losses in the power elements and the total efficiency of the converter. The research of the converter dynamic properties by means of the continuous model allows one...
The LLC resonant converter operating at constant switching frequency by interleaving technique has been analyzed using MATLAB/Simulink. The LLC resonant converter has the advantages of high efficiency, high power density, and low cost. They can be operated at no load condition and at resonance for nominal input voltage. The load sharing problem of LLC resonant converter has been overcome by SCC (Switch...
Medium voltage multilevel inverters are used for high power applications. These will show a significant impact on the system dynamics because of their vast size and high power demand. Switching models for these multilevel inverters are already available through Mat lab/Simulink. Anyway Dynamics in the system cannot be analyzed using the switching models in Power system. So Load modeling and analysis...
In this proposed work a basic unit is developed. A single unit can generate two positive and a zero level at the output. As this basic unit can develop positive levels, for negative levels, H-bridge is in addition connected to it. This is advance cascaded H-bridge multi-level inverter. With this it is possible to generate all output levels i.e. positive, zero and negative level. Also in this paper...
The multilevel flying capacitor topology is a promising technology for future electric aircraft, where high specific power density power converters are required. Hardware-in-the loop co-design can improve design throughput as more complex implementations of this technology are developed. This paper presents a comparison of hardware-in-the-loop emulation and hardware prototype results for 3-, 5- and...
Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses...
A high gain fourth-order boost converter is formulated by cascading a charge-pump with diode of the conventional boost converter. The added charge-pump is simple in structure, combination of two capacitors and two diodes, and easy to integrate with boost topologies. Its gain is almost two times of the conventional boost converter. At moderate duty ratio the converter is able to step-up a lower source...
Modular Multilevel Converters(MMCs) are considered to be state-of-the-art power converters for high voltage applications. MMCs typically consist of a stack of capacitor-switch assemblies (known as sub-modules), and requires voltage balancing control of multiple floating capacitors. To make these control decisions accurate, it is necessary to have precise knowledge about voltages across each of these...
Generating DC and AC voltage from a single DC input, through single stage conversion is cardinal for nanogrid applications. A boost derived hybrid converter is one of the topology used for nanogrid application, which works well in continuous mode of operation rendering both the dc and ac load simultaneously. Despite of this converters successful performance in continuous conduction mode, undesirable...
Modular multi-level converters (M2LCs) are typically controlled by using a hierarchical control scheme, where at least two loops are employed to control the load currents and circulating currents. This paper presents a new model predictive controller to control an M2LC with a single controller, which controls the load currents within tight bounds and minimizes capacitor voltage variations and circulating...
Nowadays, the increase in nonlinear loads has contributed to the generation of harmonics in the source current which in turn causes low power factor and disturbance in the power system. Active power filters (APFs) are known to provide one of the solutions to this harmonic related issue. Various types and configurations of APFs and control have been reported in literature. This paper proposes the integration...
Simulation based voltage regulator (VR) design is an important means to make predictive platform power delivery design, improve power performance, reduce product design iterations, conduct what if studies and reduce validation time and cost. In the switching VR modeling methodology, we adopt the unique controller topology and supply specific features from each VR vendor, and these models are far more...
The paper presents a new practical Load Reduction procedure. This procedure is adjusted to the current state, topology, load type and control resources abilities. Its applications during peak load conditions and a long time period fulfill requirements related to Peak Load Reductions and Conservation Voltage Reduction, respectively. Properties of the new procedure are compared with classic procedures.
This paper presents the simulation analysis of three-level Neutral Point Clamped (NPC) converter with bi-directional power flow capacity. Neutral point fluctuation is the major limitation of NPC converter, which is analyzed and minimized in the proposed work. An offset voltage injected in level-shifted PWM estimated online in a switching period is investigated. A control technique is proposed to minimize...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.