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.
The control of the current distribution in a two leg interleaved inverter is analyzed in this paper. Feedback is used in order to control the current distribution on the inverter legs, avoiding the use of bulky and costly passive solutions. Low THD in the output voltage is ensured by a PI compensator and a repetitive controller. The design of the current compensators was accomplished by approximating...
This paper presents overall design considerations of the high-voltage and high-frequency (HV-HF) transformer in dc/dc converter stages of solid state transformer (SST). SST is a new concept of an interface for direct connection between the distribution line and local customers which can be considered as another generation source as well from the local smart-grid point of view. Therefore, the size...
This paper presents the design criteria for the resonant tank of the LLC resonant DC-DC converter. In order to have high efficiency within wide input voltage range, high power factor for the LLC resonant tank should be ensured. The inductance ratio of the series and parallel resonant inductors is designed according to the voltage gain and input power factor of the LLC resonant tank. Finally, the prototype...
Solid state transformer (SST) exhibits good features such as high power density, small volume and weight, controlled power factor, voltage sag ride through, etc. compared with traditional line frequency transformer. The 7.2 kV AC to 120V/240V AC 20 kVA solid state transformer is a key component of the future renewable electric energy delivery and management (FREEDM) systems as the interface between...
Since standalone power systems with renewable energy generators are becoming competitive with respect to a grid connection solution for supplying telecommunications equipments in remote areas, power electronics converters are facing new challenges to simultaneously match the parameters of the renewable energies and to fulfil the telecommunications strict requirements. This paper presents a variety...
An isolated interleaved zero voltage switching (ZVS) Flyback-Forward boost type converter with active clamp scheme is designed in this paper. Both the main and the clamp switches canswitching losses operate with ZVS soft switching performance to reduce the switching losses. Furthermore, the leakage energy is recycled and the turn-off voltage spikes on the main switches are absorbed by the active clamp...
A new full-bridge circuit which can achieve zero voltage switching (ZVS) for all the primary side switches over the full load range and a wide input voltage range is proposed. The ZVS is achieved by the energy stored in the auxiliary inductor and the magnetizing inductance of the transformer. Because the leakage inductance is relatively small, there is no severe duty ratio loss or severe voltage ringing...
This paper proposes a new method for inductance calculation of induction motors (IM) based on the convolution theorem. The integral form leading to the inductance expressions is derived from the 2D modified winding function approach (2D-MWFA). As first application, a model allowing teeth saturation to be taken into account by the corresponding air-gap permeance variation is proposed. The work points...
The simulation of electromechanical systems like motor drives often requires sub-microsecond calculation timesteps considering the fast dynamic of such systems and the high-switching frequency involved. Migrating computational load to an FPGA processor has proven to effectively meet the real-time simulation needs of such systems. However, many challenges still must be overcome before broad adoption...
The servo system of a permanent magnet (PM) motor is always required to maintain fine torque and speed response. The current-control system is designed by using the electric parameters of the PM motor. However, motor parameters vary and the current sensors have offset values. When each U-phase and V-phase current sensor has an offset value, the PM motor servo system has the torque ripple and cannot...
The Switched Reluctance Machine can be used as an AC generator. In this operation mode, a capacitor is connected in parallel with each phase forming an L-C tank. Due to L characteristics, the behavior of the machine is highly nonlinear and generally, analytical solutions for the system differential equations are not possible. The steady state behavior of the system is a limit cycle. To predict and...
This paper considers the inductance spatial distribution of Interior Permanent Magnetic Synchronous Motors (IPMSM) in various load conditions. The IPMSM machine possess a unique relationship between phase inductance and rotor position, that make it possible to implement sensorless control by extracting rotor position information from the inductance distribution. During the past two decades, many sensorless...
Detection of rotor bar asymmetries in induction machines operated by an inverter can be difficult due to disturbances introduced by the fast switching power devices. Furthermore interference of the fault indicator with control dynamics of the load level lower the accuracy of most detection methods proposed. These disturbances can be avoided if the detection can be realized at standstill of the drive...
This paper proposes a simple initial rotor position estimation method to improve the starting performance of sensorless control using back-EMF. The proposed method uses relative magnitudes of the current at a standstill which are in inverse proportion to the variation of the inductance of the stator winding due to saliency of the rotor. This method is easy to be implemented and can help to successfully...
A novel isolated zero-voltage-switching (ZVS) bidirectional DC-DC converter with coupled inductors is proposed in this paper. The parallel structure in the low-voltage side and the series structure in the high-voltage side are adopted to satisfy the high power and high step-up/down conversion requirements. Moreover, by employing the PWM plus phase-shift (PPS) control technology, the current stress...
Battery is one of the most important energy storage devices in high power energy storage applications. It is widely used in the plug-in hybrid electric vehicles (PHEVs) and energy storage systems for renewable power generation such as wind and PV. In conventional series-connected high capacity battery string, due to the imbalance of battery cells, there are a few issues such as the cell damage due...
Inductive Power Transfer (IPT) is a practical method for recharging Electric Vehicles (EVs) because is it safe, efficient and convenient. Couplers or Power Pads are the power transmitters and receivers used with such contactless charging systems. Due to improvements in power electronic components, the performance and efficiency of an IPT system is largely determined by the coupling or flux linkage...
Plug-in hybrid electric vehicles (PHEVs) are an emerging technology in the market and are helping to offset the negative effects of existing transportation methods that primarily rely on fossil fuel sources. As PHEVs are being introduced into the market, renewable energy sources such as solar power are taking a larger part in the energy sector. A need for high efficiency battery charging is required...
A high frequency transformer is a critical component in a dual active bridge converter (DAB) used in a power electronics-based solid state transformer. Operation of a DAB converter requires its transformer to have a specific amount of winding leakage inductance. The demand for high efficiency requires minimization of transformer copper loss and core loss. Furthermore, available window area limits...
An improved T-model equivalent circuit of a single-sided linear induction machine (SLIM) is proposed. The analysis utilizes a set of one-dimensional air gap flux linkage equations. The model takes longitudinal end and transversal edge effects into consideration. These have to account for primary terminal half-filled slots, secondary back-iron saturation and skin effect in the secondary conducting...
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.