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.
Flyback type converters are widely used in various applications including small power LED drivers. However, they suffer from the losses from the snubber circuit. To beat this problem, previous studies investigated the lossless snubbers. However, they still have a limitation due to the additional components resulting in a high cost and low power density. In this paper, a new converter topology for...
This paper discloses the development of modular front-end medium-voltage solid-state transformer (SST) to show system level design, circuit topology, and prototype test results. Each multilevel front-end module consists of two stages: (1) ac to dc boost converter with power factor correction dc and (2) isolated dc-dc LLC converter. The proposed system has been designed, simulated, and fabricated with...
The design of a digital state-space controller employing a deadbeat state observer is presented for uninterruptible power source (UPS) inverter applications with inductor-capacitor (L-C) filters. Conventionally, the inductor current and capacitor voltage values are utilized as the measured feedback variables for the controller, and the load current is either measured or estimated. In the proposed...
In this study, the authors propose a feedback control method for energy storage systems for storing electrical energy and for load levelling. The proposed method uses both source and load power feedback, resulting in a fast response with respect to load levelling. To verify the proposed system, a power conditioning system based on the proposed feedback scheme was implemented and tested, in order to...
This paper discussed a 3kW PV Battery Energy Storage System (BESS) for conserving electrical energy and ensuring load leveling. The system targeted involved a PV unit capable of generating 3 kW of power and a 3 kW h lithium polymer battery. The proposed system was implemented in order to determine its effectiveness with respect to load leveling and energy saving. An office was selected for testing,...
The design of current controller in high speed sensorless permanent magnet synchronous machine (PMSM) drives is studied. Due to a computation and a digital pulse-width modulation (DPWM) delays, the maximum achievable speed and current controller bandwidth is limited in high speed application. In order to reduce the delays, a modification in control sequence is proposed, which can significantly reduce...
This paper proposes an inductor current feedback plus load current decoupling scheme for single-phase uninterruptible power supply (UPS) applications using a single current sensor. At first, the inductor current feedback with and without load current decoupling are compared in the view point of the output voltage control performance. The output impedance of the entire control system is analytically...
This paper discussed an inductor current observer design that employs a capacitor current control model for single-phase stand-alone inverters. The singlephase stand-alone inverter is analyzed via modeling. The proposed solution is able to guarantee a fast dynamic response and also a precise compensation of a distortion load. Moreover, with a proper design of observer parameters, it is possible to...
This paper proposes an ESS DC-DC Converter using Redox Flow Battery (RFB) for stand-alone microgrid applications. Price, safety, expandability and dynamics are crucial in ESS. Reports show that Zinc-bromine (ZnBr) RFB is the best choice in ESS. A simple electrical ZnBr RFB model is obtained from charging tests. A DC-DC converter Inductor current-DClink Voltage model is proposed for the DC microgrid...
In this paper, coupled inductor method in parallel operation of PCS is proposed. In coupled inductor the primary and secondary currents flow in the same direction, the total flux total inductance is cancelled. However, when the currents flow in the opposite direction, each flux becomes an individual inductor. Aforementioned characteristic is adopted in parallel operation of PCS. Abnormal current is...
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.