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.
In this study, we focused on an electric motorcycle system with onboard innovative charger using ultracapacitor (EDLC). The electric two-wheel scooter is an excellent performance and environmentally friendly. Moreover, it's just an effectual solution suitable for energy resource issues and the global environment. This paper discusses with the electric motorcycle using EDLC and an innovative pulse...
Uninterruptible Power Supplies (UPS) have several closed loop control topologies for control of Voltage Source Inverter (VSI). The topologies vary mainly due to choice of control/feedback variable. This paper attempts to categorize different control topologies and highlights the similarities/differences between them. Further, an analytical study on the basis of steady-state and transient performance,...
The modular multilevel converters (MMC) has been investigated for a long time and has attracted increasingly more attentions due to its special topology. In order to generate more voltage levels with less power semiconductors for the MMC, this paper presented a novel topology of modular multilevel converters. There are two innovations for the proposed topology. 1. The current limiting inductance in...
In this paper, a new continuouse current quasi Z-source inverter (CCQZSI) based on capacitor basic unit is proposed. By using n numbers of the basic units, the developed CCQZSI is proposed. High value of the boost factor is the main advantages of the proposed CCQZSI in comparison with the conventional Z-source inverter. This feature is obtained by considering same value of shoot-through (ST) duty...
In this paper, a novel single-stage single-phase transformer-less buck-boost inverter is proposed, in which a reduced number of passive components is used. The proposed inverter combines the conventional buck, boost, and buck-boost converters in one converter in order to obtain a sinusoidal output voltage. In the proposed inverter, the input DC source and the load or grid have the same ground. Therefore,...
This paper proposes a comprehensive analysis of switched boost inverter's (SBI) voltage and current equations, using specific switching method in continuous current mode (CCM) operation. The presented switching method makes SBI proper to be used in galvanic and electrochemical applications. The boundary amount of inductor between the two CCM and discontinuous current mode (DCM) operations is calculated...
Traditional half bridge dual buck inverter (DBI) has a low power density due to the employing of two large input capacitances and two discrete output inductors. Magnetic integration is an effective method to enhance power density. However, unexpected circulating current may be induced by adopting conventional magnetic integration scheme. This paper proposes a novel magnetic integrated DBI inverter,...
This paper presents a new ZVZCS three-level inverter with T-type structure. The proposed inverter can achieve ZCS on arm switches and ZVS on neutral point switches by series connecting the arm switches with resonant inductors and parallel connecting the neutral point switches with resonant capacitors. The proposed inverter can achieve a significant reduction in power loss dissipation. In this paper,...
A grid-tied inverter can be designed to operate in boundary conduction mode or discontinuous current mode to achieve high efficiency and high power density. However, the switching frequency variation in boundary conduction mode can be a problem. Although the switching frequency in discontinuous current mode is fixed, the output current becomes distorted due to the resonant between inductor and parasitic...
This paper proposes a high-efficiency voltage sag protector with low ground leakage current. The line-frequency transformer of the conventional system is replaced by a bidirectional dc-dc converter. A bidirectional dc-ac inverter copes with voltage sag and interruption. It has low ground leakage currents by the common grounded capacitors. A bidirectional dc-dc converter transfers the electrical power...
This paper presents a new structure based on a line-commutated inverter (LCI) for photovoltaic (PV) applications. The proposed LCI circuit is able to inject the DC power to the grid at the unity power factor and with reduced harmonic levels. The proposed circuit with voltage-based maximum power point tracking (MPPT) is implemented in grid-connected PV system. The experimental results show that proposed...
For LCL type grid-tied three-phase inverters, a model predictive controller is proposed. Through the controller, system performance indexes, i.e., current tracking, inductor loss, switching loss can be combined and then optimized. Since the controller is a constrained nonlinear problem, an on-line algorithm is presented which is based on branching and bounding method. Finally, through Matlab simulation...
Traditional Z-source inverter can boost or buck voltage for its unique impedance network, but also has its own drawbacks, such as input current is not continuous, boost capacity is limited, the capacitor voltage stress is large and etc. In order to overcome the shortcomings of the traditional Z-source inverter, a series of Z-source inverters are proposed. In this paper, the topology of three kinds...
This paper presents an approach to the implementation of slow-wave transmission lines with high potential for miniaturization. The unit cell of the structure is a symmetric network consisting of a (host) transmission line section loaded with a shunt capacitor at the central plane and two series inductors at the extremes. Due to the presence of two reactive elements in the unit cell (inductor and capacitor),...
In most inverters, it is required to obtain ac power with reduced cost. Especially, in power conditioners for small power like photovoltaic power generation, the reduced cost is more important. Because the circuit construction is very simple, so there would be little room to modify its fundamental construction. In such situations, some novel circuit constructions were proposed by the authers. In this...
Dual buck half bridge inverter(DBHBI) has a benefit of no shoot-through issue, however, severe waveform distortion is badly undesirable. Hysteresis control is commonly used to improve output quality, which has fast dynamic response and easy to approach. Since the switching frequency in the hysteresis control is unfixed, voltage loss and harmonic frequency issues are inevitable. The paper proposes...
The focus of this paper presents a distributed control method based on the gossip communication mechanism that will regulate the voltage of active loads in islanded microgrids. The proposed distributed voltage control (DVC) strategy based on the gossip protocols is fully distributed and by the way of the discrete-time communication; moreover, each active load unit only requires the local voltage and...
This paper presents the limitations of classical controllers in discrete time in reducing the output impedance of a single-phase inverter voltage source for UPS. The controller design methodology for a topology with the feedback of the inductor current and the capacitor voltage of the output L-C filter is proposed. This proposal considers the performance requirements for UPS, established in the standards...
Grid connected inverters with LCL output filters are widely used in exporting energy generated from renewable energy sources. The LCL filter and inductors used in this filter has important effect on inverter performance. Although it is different in high power levels nowadays, powder cores are commonly used in inductor design in low and medium power levels. In this study, inductors for LCL filter of...
Input-series-output-series (ISOS) inverter system is very suitable for high input voltage and high output voltage power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and simplify system design. For the...
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.