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.
Dynamic and steady-state behavior of a paralleling three-phase AC-to-DC converter with reduced dc bus capacitor and nearly unity power factor is investigated in this paper. The circuit is simulated and the simulation results are analyzed and verified by measurements. A 1.5 kW laboratory prototype with small dc bus capacitance 690 µF (0.46 µF /W) is implemented and tested to verify the feasibility...
The advent of the 15kV SiC IGBT device has made a single series stage medium-voltage (MV) and high-frequency (HF) DC-DC Dual Active Bridge (DAB) converter application viable. The Y: Y/Δ three-phase DAB is a high-power isolated DC-DC converter based on three-level neutral-point clamped (NPC) on the MV side. A MV/HF transformer used in the DAB, has significant parasitic capacitances, which cause ringing...
A new control approach for bidirectional DC-DC (BDC) converter is proposed in this paper. This approach aims at controlling a BDC in such a way that makes it behaves like a multi-level virtual conductor. As a matter of fact, the voltage difference between the terminals of any conductor is zero volts. Conversely, the main target of the proposed control approach is to keep the voltage difference between...
This paper presents a power-cell Switching-Cycle Capacitor Voltage Control (SCCVC) approach to control the capacitor voltage ripple for the Modular Multilevel Converters (MMC). The capacitor voltage will be following the reference in one switching cycle by taking advantage of the degree of freedom in the control, the circulating current. The capacitor voltages resonate with the inductors in the converter...
In AC/DC converters for on-board chargers, the DC-link capacitor on the output side in a power factor correction (PFC) converter uses aluminum electrolytic capacitors in order to obtain a large capacitance with low voltage ripple and small size. Therefore, it is necessary to reduce the capacitance when using film capacitors without increasing the size of the converter in order to realize a capacitor...
Recently, the capacity of renewable power sources installed in small remote islands, whose power grid is isolated from large scale grid, increases because of the environmental affairs and the generation cost and so on. But in the small remote island grid, the power fluctuation caused by renewable power sources affects power grid stability and operation. In this paper, several stabilizing methods based...
Gallium nitride (GaN) power semiconductor technology offers a potential for significant performance increase in power electronic converters. This potential cannot be fully exploited if GaN devices are used as drop-in replacement for silicon devices in existing systems. This paper investigates the switching limits influenced by the device output parasitic capacitance and parasitic inductance of the...
In this paper, the potential of the multi-cell approach for power electronic converters with efficiencies and power densities beyond the barriers of state-of-the-art systems is discussed. Based on fundamental scaling laws the benefits of splitting a system into multiple converter cells are derived in terms of lower volume and/or higher power density for a given cooling capacity. In addition, the conditions...
This paper presents a modular push-pull PWM converter (MPC) for a battery energy storage system, which is intended for grid connections to medium- or high-voltage power systems. The converter per phase consists of a center-tapped transformer and two arms based on a cascade connection of multiple bidirectional PWM chopper cells with floating dc capacitors. This paper proposes a new control method for...
Modular DC-DC converters are commonly used to increase the power capacity of a DC-DC converter for high power applications. To obtain the required power, multiple modules are connected in the input-parallel and output-parallel (IPOP) configuration. In addition, phase-shedding are used to increase efficiency of such modular DC-DC converters at light-loads. With Single Active Bridge (SAB) modules, efficiency...
This paper describe a design method of an LCL filter for the three-phase two-level voltage-source PWM converters. The grid current harmonics regulation is the primary condition for the operation of the grid-connected converters to satisfy. If the grid voltage is assumed to be ideally sinusoidal, PWM switching is the only factor to produce harmonics on the grid current, especially around the bands...
The development of a single switch cell for a modular nanosecond pulse generation system is described with the proposed use in plasma-assisted ignition for scramjets. Using the inductive voltage adder topology and high voltage MOSFETs, the proposed system can generate nanosecond pulses with variable duration from 20 ns to 50 ns, fast rise time (< 6 ns), fast fall time (< 6 ns) and variable amplitude...
The efficient reduction of EMI noise generated by power converters has been an indispensable technology. In order to meet the requirements of CISPR22, EMI filters have to be equipped with power converters. It is widely known that an EMI filter can be designed more optimally if the designer could know its inherent EMI noise in advance. This paper presents an accurate simulation method for the conducted...
Vibration energy regeneration with lead zirconate titanate piezoelectric (PZT) device has been reported by many researchers for many years. Various factors influence the energy regeneration efficiency of the PZT devices in converting the mechanical vibration energy to the electrical energy. This paper presents the analytical and experimental evaluation of energy regeneration efficiency of PZT devices...
This paper examines different winding strategies for reduced capacitance inductors in active power factor correction circuits (PFC). The effect of the parasitic capacitance is analyzed from an electro magnetic compatibility (EMI) and efficiency point of views. The purpose of this work is to investigate different winding approaches and identify suitable solutions for high switching frequency/high speed...
This paper describes the characteristics of low frequency ac transmission system using cycloconverters with three configurations. The purpose is to evaluate and choose the most suitable operating frequency and number of phases for this system. The new control scheme is also provided for all operating transmission system. Cable and filter selection are also included in this paper.
This paper introduces concept of discrete control method of class E amplifier which keeps nominal operation for varying load resistance. In the proposed method, shunt capacitance and output resonant capacitance are varied electronically by setting status of switches which are connected to capacitances. Proposed method can keep nominal operation, i.e., ZVS and ZDS, both when load resistance is higher...
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.