With the increased deployment of renewable energy devices into power systems, more converters controlled by the standard D-Q axis Current Injection (DQCI) theory have been connected to the grid, displacing synchronous generators in the process. Due to the nature of the DQCl strategy, these converters cannot impose a reference voltage and frequency. A study in the simulation environment has been...

In the conventional DC-AC inverter consisting of two DC-DC converters with unipolar output capacitors, the output capacitor voltages of the DC-DC converters must be higher than the DC input voltage. To overcome this weakness, this paper proposes a single-phase DC-AC inverter consisting of two embedded Z-source converters with bipolar output capacitors. The proposed inverter is composed of two e...

Switched-capacitor DC-DC converters are useful alternatives to inductor-based converters in many lowpower and medium-power applications. This work develops a straightforward analysis method to determine a switched-capacitor converter’s output impedance (a measure of performance and power loss). This resistive impedance is a function of frequency and has two asymptotic limits, one corresponding ...

Renewable energy resources are gaining popularity now a days. Their input varies with changes in climatic conditions. So the output from them is not a constant value. The output of the energy sources have to be connected to grid. But the grid voltage is always constant. So the output from the renewable energy converters have to be constant. But the input of the renewable energy converters alway...

BACKGROUND A shorter duration of untreated psychosis has been associated with better prognosis in schizophrenia. In this study, we measured the duration mismatch negativity (dMMN), an event-related potential, and cognitive performance in subjects with at-risk mental state (ARMS), patients with first-episode or chronic schizophrenia, and healthy volunteers. The main interest was to determine if ...

The worldwide demand for green energy systems is evident. In this context, wind energy converters will play a paramount role. Extending the service life of a wind energy converter translates into significant economic savings as well as ecological earnings. New opportunities for the management and operation of the wind energy converters make it beneficial to know the structural condition and the...

There has been an ever-increasing demand to increase the switching frequency, power density, efficiency and dynamic performance of switch-mode power converter, the development of soft-switching technology has taken an accelerated pace. This paper provides a review on the development of soft-switching power converters for electric vehicle (EV) propulsion and recent research trends will also be d...

In this paper, we test the performance of a quasi-optical, internal-gyrotron mode converter. When cold testing mode converters, a rotating higher-order mode is commonly used. However, this requires a nontrivial design and precise alignment. We thus propose a new technique for testing gyrotron mode converters by using a simple, non-rotating, higher-order mode generator. We demonstrate the feasib...

— Recent advances in solid-state semiconductors have led to the development of medium voltage power converters which could obviate the need for the step-up transformers of renewable power generation systems. The modular multilevel cascaded converters have been deemed as strong contenders for the development of medium-voltage converters, but the converters require multiple isolated and balanced ...

The residue number system (RNS) is a carry-free number system which can support high-speed and parallel arithmetic. Two major issues in efficient design of RNS systems are the moduli set selection and the residue to binary conversion. In this paper, we present two efficient residue to binary converters for the new three-moduli set {2, 2 + 1, 2 – 1}. This moduli set consists of pairwise relative...