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.
A novel high-power modular input-series-input-parallel output-series connected DC/DC converter for medium-voltage application is proposed. Emphasis has been placed on power sharing control to compensate parameter mismatches and achieve equal power distribution between modules. Converter control is extended to achieve fault-tolerant operation by exploiting modularity to provide redundancy in the event...
This paper proposes a control system design for cooperated stabilizing control of PMSG based grid connected wind farm. In this study, a wind farm composed of PMSGs and SCIGs is considered to be connected to multi-machine power system. Though outputs of the SCIG based wind turbines are collected on AC network, PMSG based wind turbines are integrated in DC network with single grid side converter. In...
This paper provides a bridged-T voltage control scheme for a H bridge SiC inverter switching at 150 kHz for generating various waveforms at wide range of frequencies (60 Hz to 10 kHz) which is developed as a core loss test unit. Bridged-T controller attains the advantages of both the open and closed loop controllers. It has the fast dynamic response feature of the open-loop controller and zero steady...
In order to reduce energy consumption, we have developed a technique that quickly reverses salient poles in permanent magnet (PM) motors. When this proposed technique is used, because of this permanent magnetization, PM motors can change negative salient poles to positive salient poles. This paper proposes a novel PM motor that uses our proposed technique to reverse saliency and describes the principle...
The conversion between DC and AC power will typically introduce a low-frequency pulsation power in the DC side of single phase power converter which may create instability, lowers its efficiency, and reduces the reliability. In this paper, a novel Power Decoupling Modular (PDM) with 2 series differential decoupling capacitors at the ac side is proposed. Compared with the DC PDM, the proposed modular...
Natural balancing of the flying capacitor converter is activated when the converter is operating with phase shifted carrier PWM and the carriers are exactly interleaved. The mechanism is stable and has many benefits but the dynamic response can be slow. In this paper a novel active balancing approach, based on the application of an off-line optimized phase shift of the individual carriers during the...
This paper proposes a detailed numerical model of a very narrow air gap of a permanent magnet synchronous machine without an imposed axial flow. The flow structure analysis and the convective heat transfer are carefully investigated using an axisymmetric model of two concentric cylinders where the inner cylinder is rotating and the outer cylinder is stationary. For the different cases, only isothermal...
Continuous online monitoring of electrical assets is critical for reducing the process downtime and the associated financial losses in industrial applications. Majority of large induction motors, which are critical to industrial applications, are mains-fed. Condition monitoring of these mains-fed motors is critical for reducing the failure rate of these motor systems. Motor relays, commonly used to...
This paper investigates the calculation, modelling and interpretation of efficiency maps for electrical machines. The efficiency maps are calculated using a finite-element based mapping of losses, torque and flux-linkage as a function of the d- and q-axis currents and speed. For modelling efficiency maps, it is shown that a number of key loss types can be described in the form Tmωn. The effect of...
Brushless Doubly-Fed Induction Generator (BDFIG) is potential for power generation applications for its high reliability and low maintenance-cost. There are two operation modes for BDFIG: grid-tied and stand-alone modes. The grid-tied mode usually uses the power winding (PW) synchronous and orientation frame since PW is connected to the grid; however in stand-alone mode, the PW is connected to the...
This paper presents the development of a single-phase online Uninterruptable Power Supply (UPS) system using a HPF front-end Boost converter with integrated Power Factor Correction (PFC) and DC-DC functions and an ordinary Full-Bridge as the single-phase output inverter. Besides the front-end stage with integrated PFC and DC-DC functions, the main feature of the proposed solution is the use a Proton...
This paper presents a new wireless power transfer topology for electric vehicle (EV) charging application. The main emphasis is given on high frequency DC-AC and AC-DC wireless power transfer stage where the inversion stage is current fed topology. The required resonance in transmitter side is C-C-L type and in the receiver side series L-C type. Inductor in dc-link provides short circuit protection...
In this paper a novel DC line-interactive uninterruptable power supply (UPS) with load leveling feature is proposed. The new UPS replaces the common AC three phase UPS and can be used for systems with pulse loads, and has superiority in performance and efficiency. The DC UPS utilizes Li-ion battery module in the DC link to perform the load leveling feature and UPS functionality. A Li-ion LFP based...
Parallel-connected four-pole inverters (FPIs) becomes an important application in three-phase four-wire uninterrupted power system, owing to the benefits like high reliability, cost-effective and the convenient expansion of power capacity. Nevertheless, such parallel connection would lead to the side-effects, just as the circulating current, accompanied by extra loss and current distortion. The difference...
In this contribution the concept of a multi-tap transformer topology for SS-compensated Inductive Power Transfer (IPT) systems is proposed. The objective is an improvement in terms of overall efficiency and maximum tolerable misalignment of the secondary transformer coil that is assumed to be mounted underneath an electric vehicle (EV). In a first step mathematical expressions are derived to describe...
This paper presents an Induction Machine (IM) based marine current (MC) generation unit with embedded maximum power point tracking (MPPT), Electrical Losses Minimization Technique (ELMT) plus Discontinuous PWM (D-PWM). The target is the development of a highly efficient MC generation system with high dynamic performance, able not only to track the maximum power available from the rurbine rapidly,...
This paper presents a new maximum power point tracking (MPPT) algorithm for thermoelectric generators (TEG). The proposed method is based on implementing an innovative way for indirect detection of the open circuit voltage and short circuit current, which will be used to directly steer the TEG interface converter to the MPP in very small number of steps. The proposed algorithm uses two modes of operation,...
To deal with the energy limitation of underwater gliders, based on existing wave energy converters at home and aboard, a pendulum-type ocean kinetic energy harvester was proposed for sensors energy supply on underwater gliders, which only consists of two conversion systems, and can directly transfer the ocean energy to the generator to improve the conversion efficiency. A prototype device was fabricated...
This paper proposed a positive sequence detector (PSD) based on cascaded delayed quadrature signal cancellation (CDQSC). The delayed quadrature signal cancellation (DQSC) operator based on two orthogonal signals in dq-frame or αβ-frame can be tailored to eliminate any specified harmonic. The proposed DQSC operator can be further cascaded to stepwise reject all undesired harmonics. Then the conditioned...
For critical load supplied with dual power source, solid state transfer switch (SSTS) is usually employed to realize rapid bus transfer. A SSTS-based soft transfer control method is proposed in this paper to suppress the inrush current when the load driven by motor is switched onto alternate source. The research focus on concrete soft transfer control strategy and how to recalculate firing angles...
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.