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.
Photovoltaic arrays have been shown to possess significant influence on the dynamic performance of coupled source-converter-load system while its dynamic resistance is the most important parameter, contributing to the overall system dynamics. In this paper, a method of deriving the parameters of linearized photovoltaic equivalent circuit from manufacturer data is proposed. The approach allows predicting...
This paper presents a simple applied space vector modulation (SVM) strategy using a duty-offset component injection for three-phase/level power factor correction rectifier, based on current sector control. In the proposed strategy, the duty cycle equations are determined by utilizing the calculated switching time method in order to generate the duty cycle signals based on a seven-segment switching...
Half-Bridge Modular Multilevel Converters (HB-MMCs) are defenseless against DC side faults. Different types of DC Circuit Breakers (DCCBs) assisted with arrester banks/damping resistors such as solid-state CBs and hybrid DCCBs can be used to interrupt the DC fault current. Arrester banks are used to block any overvoltage after interrupting the fault current and in turn to demagnetize the circuit inductors...
This paper studies power enhancement of piezoelectric transformers to be used in inductorless, half-bridge, piezoelecteric-based switch mode power supplies for driving a piezo actuator motor system in a high strength magnetic environment for magnetic resonance imaging and computed tomography applications. A new multi element-piezo transformer solution is proposed along with a dual mode piezo transformer,...
A Class EF2 DC/AC inverter and a Class EF2 AC/DC rectifier are presented for a 25 W inductive Wireless Power Transfer (WPT) system operating at a frequency of 27.12 MHz. Class EF2 inverters and rectifiers are similar in construction to Class E circuits, but they contain an additional series LC circuit connected across the switch that is tuned to resonate at the second harmonic of the switching frequency...
High voltage pulse generators are commonly used in water treatment applications. In this paper, a high voltage pulse generator with closed loop control on its output voltage is presented. The high-voltage pulse generator is based on the employment of Capacitor-Diode Voltage Multipliers (CDVM) centrally fed from dc-dc boost converter. The generator provides transformer-less operation and high-voltage...
Power and control isolation is necessary for many applications including isolated gate drive supply, device characterisation and the testing of power electronics converters. Commonly the isolation stage is integrated directly into the converter and therefore cannot easily be repurposed for another project, serviced in case of failure or easily adjusted for other power supply requirements. This paper...
In this paper a comparative analysis is carried out between the surface mounted permanent magnet (SPM) type and the flux focusing type slotted double stator and single rotor (DSSR) axial flux permanent magnet motor (AFPM). For reasonable comparison, physical dimensions of both the slotted DSSR AFPM topologies are considered the same, however the consumed amount of permanent magnets (PMs) is different...
The PFC Boost Converter is an integral part of modern power supplies to improve power factor in electronic devices. The inherent problem associated with it is common mode (CM) Electromagnetic interference (EMI) noise arising due to the higher switching transition rate (dv/dt). The main coupling path for the CM noise is provided by parasitic capacitance occurring between the switching node and ground...
The use of wireless technologies to power devices has many practical benefits however it is commonly disregarded due to losses in transferring power in this way. The most common method for wireless power transfer is via Strongly Coupled Magnetic Resonances (SCMR), which transfers energy by using the mutual inductance between coils. Generally, to achieve a high efficiency wireless power transfer the...
In this paper, a novel multi-stress model which estimates the lifetime of the winding insulation relative to its duty cycle is proposed and investigated. With an adequate implementation of this model, then an electrical machine can be designed not only in terms of its performance requirements, but also considering the associated reliability and lifetime aspects. Since thermal and thermo-mechanical...
The manuscript presents a method of interfacing renewable energy generators (REG) by a new method of maximum power point tracking (MPPT). The method utilizes the nonlinear sum of REG static and dynamic conductances as MPPT loop regulation variable. Static and dynamic conductances are both operating point and environmental variables dependent. Nevertheless, their sum is always zero when the REG operates...
In this paper, the technological features of a innovative smart socket able to supporting a novel service for the Distribution Network Operator (DNO) and the Demand Response Service Provider (DR-SP) is presented. The service provides a fully decentralized voltage control for the DR-SP and it is designed to be implemented in residential units. In detail, the paper proposes a novel smart socket design...
The use of silicon carbide (SiC) semiconductor power devices has been studied and evaluated in a wide variety of converters. The work presented in this paper shows the performance of C2M SiC MOSFETs compared to Si devices operating as switching elements in a 5-level, single phase, multilevel converter. The paper describes the multilevel converter platform used to undertake the evaluation study and...
This paper proposes a unified AC chopper topology that can generate both non-inverting and inverting AC voltages. It is therefore suitable for compensating utility voltage sag-swell in domestic consumer and industry infeeds. The proposed converter is able to save on the passive device footprint and improve dynamic performance compared to other similar candidates. The topology derivation, operating...
Synchronous Reluctance (SynRel) machines are considered a competitive alternative to the induction motors for variable speed drive applications due to their comparable performances and low cost. The absence of rare earth permanent magnets makes them very attractive also in the automotive sector especially for light electric vehicles. The design of SynRel machines has been formalized by many authors...
Repetitive control offers an accurate current control scheme for grid-tied converters to feed high quality sinusoidal current into the grid. However, with grid frequency being treated as a constant value, conventional repetitive controller fail to produce high quality feeding current in the presence of practical time-varying grid frequency. This paper explores frequency adaptive repetitive control...
Part I of the study presents the importance and the analytical and numerical methods to perform a thermal- mechanical stress simulation with evenly distributed temperature for single wires. Part II of the study presents a method with thermal and mechanical conjugated simulations with unevenly distributed temperature for multiple wires and the results are compared to the structural simulation with...
An increased attention has been detected to develop smaller and lighter high voltage power converters in the range of 50V to 400V domain. The main applications for these converters are mainly focused for Power over Ethernet (PoE), LED lighting and AC adapters. This work will discuss a study of using enhancement mode gallium nitride switches to form a 50V quasi-square-wave zero-voltage-switching buck...
In recent years, the stacked polyphase bridges converter has gained increasing interest due to its modularity and scalability for different power and voltage levels. To maintain the advantages from this architecture, distributed control system is required instead of centralized control system. A serial communication protocol based distributed control architecture for an SPB converter consisting of...
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.