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 secondary power system built inside the different units of a satellite typically needs several output voltages. The most common solution to achieve this is by means of a DC/DC converter with one or several outputs and linear regulators. The number of components available for European designers is relatively limited and hence, common solutions in ground applications are not so simple to implement...
This paper provides an overview of DC side fault tolerance issues of VSC based HVDC system and the need for fault tolerant converters. The working principle and DC fault ride through capability of recently introduced Alternate Arm Modular Multilevel Converter(AAMMC) has been discussed. The capacitor voltage balancing issues of AAMMC is analyzed and a novel scheme for balancing capacitor voltages of...
An energy autonomous system is required to supply power to remote areas or islands. This paper presents a control strategy for a large-scale Proton Exchange Membrane Fuel Cell (PEMFC) system used in a stand-alone application. The studied system consists of the dynamic model of a PEMFC that has been validated with experimental data, a dc/dc boost converter, a dc/ac Voltage-Source Converter (VSC) and...
The matrix converter (MC) is an attractive topology for the more electric aircraft because of its high-power density and bidirectional power flow features. One of the challenging issues in MC is the current commutation. The commutation process in a matrix converter (MC) is more complex as compared with that of the traditional AC-DC-AC converter due to the lack of natural free-wheeling paths. Multi-step...
In this paper, a low profile LLC resonant converter with two transformers using a planar core is proposed for a slim switching mode power supply (SMPS). Design procedures, magnetic modeling and voltage gain characteristics on the proposed planar transformer and converter are described in detail. LLC resonant converter including two transformers using a planar core is connected in series at primary...
This paper introduces an enhanced differential power processor topology and principle of operation for photovoltaic systems (PV) that is based on switched-capacitor technology, featuring local maximum power point tracking (MPPT) capability, zero current switching (ZCS), high efficiency over wide operation range, and reduced size. The new converter operates as a voltage-dependent current-source and...
This paper presents a primary-parallel secondary-series multicore forward micro-inverter for photovoltaic AC-module application. The proposed solution changes the number of active phases depending on the grid voltage, thus enabling the usage of low-profile unitary turns ratio transformers. Therefore, the transformers are well coupled and the overall performance of the inverter is improved. Due to...
The voltage regulation for stand-alone three-phase single-stage boost inverter (SSBI) is presented in this paper. In three-phase SSBI, the voltage regulation is achieved by adjusting the boost ratio. The SSBI has been simulated for a wide range of input dc voltages and load levels. Moreover, the performance a 2kW 208/230V laboratory-scale three phase boost inverter is presented for both linear and...
Under the high penetration of renewable energy, the power grid may features as the weak grid, which contains a large set of grid impedance values and varies of harmonics. The grid-connected inverter can be greatly challenged by this weak grid condition when it is operated as the interface to inject the generated power into the grid. Particularly, the stability problem may be aroused by the grid impedance...
This paper is focused on a new converter topology with medium frequency transformer isolation for medium voltage (MV) wind turbine generator (WTG) power systems. The approach is a high density power conversion, with simultaneous high performance features suitable for next generation wind power systems for both on-shore and off-shore applications. The proposed topology employs 1-phase multi-level AC-AC...
Ride-through capabilities of the doubly-fed induction generator (DFIG) during grid fault have been studied a lot. However, the thermal performance of the power device during this transient period is seldom investigated. In this paper, the dynamic model for the DFIG and the influence of the rotor current to the damping time of the stator flux and rotor terminal voltage during the symmetrical grid fault...
This paper proposes an output current ripple reduction algorithm using model-based predictive control (MPC) for an energy storage system (ESS). In single-phase systems, the DC/AC inverter has a second-order harmonic at twice the grid frequency of a DC-link voltage caused by pulsation of the DC-link voltage. The output current of a DC/DC converter has a ripple component because of the ripple of the...
The ability of distributed generation sources to enhance the power quality of micro-grids is an important issue for the emerging power grid. This paper proposes a decentralized approach for power quality improvements in smart micro-grids. In this scheme, a modified reduced-order digital adaptive notch filter has been introduced and employed to extract the harmonic content of power system variables...
The conventional droop control method, which does not require communication lines, is an effective control scheme to dispatch power among inverters in the microgrid. However, this method has inherent tradeoffs: frequency vs. active power accuracy and amplitude regulation vs. reactive power sharing accuracy. To cope with this problem, this paper presents a novel active power control strategy to improve...
In this paper, the analysis and design of the high frequency corona generator with LCC resonant topology applied in film treatment is proposed. The designed converter works with a specified output voltage, which makes the film treatment efficient and stable. By making the converter operate in a critical mode, the analysis and design is simplified and the resonant parameters can be described by time...
High energy density high-voltage metallized film capacitor is one of the most suitable energy storage elements in pulsed power system, such as Electromagnetic Gun (EMG) system. But the voltage drop at high voltage is an inherent problem of metallized film capacitor, which will affect the launching precision of EMG system. To improve the launching precision, this paper mainly focuses on the voltage...
This paper introduces a single-stage battery charger for neighborhood electric vehicles (NEVs) which has the following characteristics: i. operate in continuous-conduction-mode (CCM), ii. include bridgeless operation, iii. realize zero-voltage switching (ZVS) operation for all MOSFETs, iv. provide controlled di/dt turn-off of the output diodes, v. has symmetric operation. The proposed battery charger...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
Most eco-friendly vehicles can adopt a concept of an integrated battery charger (IBC), which utilizes a motor drive system for charging a high voltage battery pack. The IBCs inevitably require an additional boost inductor when the common mode inductance of the motor/generator (M/G) is too small to satisfy a condition for continuous conduction mode operation. In this paper, the IBC system with the...
Electric-drive vehicles, including hybrid (HEV), plug-in hybrid (PHEV) and electric vehicles (EV), require a high-voltage (HV) battery pack for propulsion, and a low-voltage (LV) dc bus for auxiliary loads. This paper presents an architecture that uses modular dc-dc bypass converters to perform active battery cell balancing and to supply current to auxiliary loads, eliminating the need for a separate...
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.