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.
In this paper the line reactor design for parallel connection of high power inverters with interleaved carriers is presented. Based on state of the art interleaving reactors configurations and based on high power requirements, design iterations are performed to detect the implementation issues. The parasitic effects are highlighted in finite element models and a new reluctance model is introduced...
This paper presents a boost switched-capacitor nine-level single-phase inverter, which utilizes flying capacitors and an H-bridge. Besides the boosting ability, the inverter is capable of producing redundant switching states that are used as a degree of freedom in controlling the voltage of DC link capacitor. A comprehensive study of the theoretical aspects of the proposed structure and its practical...
400 Hz inverters, known as Ground Power Units (GPUs), are widely used in aviation and marine industry. Due to their approximately eight times higher fundamental frequency, 400 Hz inverters are much more sensitive to practical delays such as sampling delays, when compared to traditional 50–60 Hz inverters. Conventional controllers designed for 50–60 Hz inverters, therefore, must be redesigned to properly...
This paper presents a harmonic compensation method, which can be used to significantly reduce lower-order harmonics in the grid-side current of single phase power factor correction (PFC) circuits. Often there are limitations on the percentage of lower-order harmonics in the grid currents to maintain conducted EMI standard, which may be violated, especially during light load conditions. The proposed...
One of the advantages of a five-phase motor is to maximize the torque per ampere ratio where a quasi-rectangular air gap flux distribution is obtained. The problem is that the Space Vector Modulation (SVM) strategy, used in multiphase drives, proves to be a complex task. This is due to a mutual relation between voltage vectors in multiple orthogonal spaces. The main problem in SVM algorithms for multiphase...
The accurate control of the line current, robust and dynamic behaviour even under distorted grids and the behaviour on other faults are important requirements for grid connected inverter systems. This paper presents a sensorless grid voltage determination system in combination with an direct current control method optimized for multilevel inverters.
Micro-grid is defined as a local power network with distributed energy resources (DERs) as micro-power sources scattered throughout the supply area. For reliable and short range transmission of power, micro-power sources are controlled as standalone as well as grid-synchronized power sources. The idea is to design a resilient, efficient and cost effective infrastructure based on advanced communication...
Compression and pumping applications represent a majority of all rotating machinery in modern industrial plants. Increasingly in the past two decades, electric motors are replacing turbines as the prime mover of choice for large rotating equipment. The use of electrically driven equipment is now widespread even for critical applications. As semiconductor technology evolves, adjustable speed drives...
Module-Integrated Converters (MICs) are becoming an interesting option for residential photovoltaic (PV) applications because the PV modules are enabled s to work as plug and play devices. Reducing the costs and increasing the lifetime of the MICs are the main challenges for large-scale adoption of MIC technology. Particularly, current spikes during the connection of the MICs with the grid cause unnecessary...
This paper presents the mathematical model of a three phase Solid State Transformer (SST). The model is designed in PLECS. The model is integrated into a grid with high penetration of non-linear loads. The model addresses constraints including smooth voltage regulation, permitted Total Harmonic Distortion and the incorporation of distributed generation and energy storage. The main feature of the SST...
The problems associated with the harmonics needs more attention as more number of distributed generators like PV and wind are integrated into a distribution system. Although the integration presents a lot of benefits, satisfying the needs of local load requirements by reducing the line losses and facilitating congestion management, the problems of power quality that impact the distribution system...
Conventionally, Selective Harmonic Elimination (SHE) method in 2-level inverters, finds best switching angles to reach first voltage harmonic to reference level and eliminate other harmonics, simultaneously. Considering Induction Motor (IM) as the inverter load, and wide DC bus voltage variations, the inverter must operate in both over-modulation and linear modulation region. Main objective of the...
This paper describes a three-phase shunt active power filter (APF) with improved dynamic parameters. The objective of this solution is to reduce the value of total harmonic distortion (THD) ratio of the power supply line. A predictive control algorithm is implemented in the control circuit, allowing to react in advance to predictable load changes and to reduce dynamic distortion. For loads with unpredictable...
This paper presents two selective harmonic elimination (SHE) and a mixed SHE-selective harmonic mitigation (SHM) procedures applied to 5-level inverter. The first one is a graphical procedure to control harmonic spectrum of a given voltage and/or current waveform. A fundamental frequency technique using a reference sinusoidal signal (RSS) to modulate the output voltage waveform v0 is applied, considering...
A conventional 3-level PWM Inverter and a Cascaded Multilevel Inverter, both rated at 230Vrms voltage output and 3KW are analysed using the Switching Function. The PWM signal for the 3-level inverter is derived by applying the Switching Function Technique to the equal area principle. For the Cascaded Multilevel Inverter the Switching Function Technique is initially applied to each H-bridge, and then...
This paper presents both analysis and experimental verification of applying Selective Harmonic Elimination (SHE) technique for cascaded half-bridge multilevel inverters. The inverter units are fed from PV modules throughout step-down dc-to-dc converters to regulate the inverter input voltage. The inverter has to be asymmetric which allows more possibility to connect PV modules to get maximum possible...
According to the requirement of the power factor and the dynamic performance of the asynchronous machine tool field, an asynchronous motor inverter with active power factor correction is proposed. The proposed inverter is a 3kW asynchronous motor drive control platform. At first, the proposed single phase converter with APFC is realized by using the MATLAB/SIMULINK. Then, the boost APFC is designed...
Bearing fault diagnosis in induction motors is an open field of research. The use of the stator current to monitor the bearing condition has some advantages over other signals such as vibration and acoustic emission, but it has proven to be less effective than for another kind of faults. This paper proposes to overcome these difficulties by an automatic classifier that uses a significant amount of...
Inverter open circuit faults (IOCFs) in AC drives lead to undesired effects and thus, the reconfiguration of the drive to a post-fault operation mode is desirable. In the past some authors have proposed drive topologies and operation strategies to keep the drives operating after IOCFs. However, increased losses and temperatures during these post-fault operation modes lead to a reduced performance...
Conventional LC filters cannot compensate effectively harmonics due to non-linear loads in a grid-connected photovoltaic (PV) system. Thus, active power filters (APF) are introduced due to its characteristics and performances, for compensation of harmonics from non-linear loads in the grid-connected photovoltaic (PV) system. This work presents a three-phase voltage-fed shunt active power filter implementation...
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.