Inverters with transformers of conventional type, connected in PV grid-tied generation systems have now being replaced by transformerless inverters due to various reasons such as reduction in size, weight and cost, improvement in efficiency etc. Transformerless inverters cause a number of technical challenges in grid-connected PV systems, among which flow of leakage currents is a major problem....

Cascaded multilevel inverters offer several advantages over other multilevel structures: modularity, high voltage capability, reliability. Additionally, a large number of cascaded inverters using a square wave modulation method allow low losses in the inverter and low harmonic distortion in the output voltage. This paper analyzes the main features of one of these modulation methods especially i...

This The Permanent Magnet Synchronous Motors (PMSM) are used for medium power applications and preferred over conventional motors like Induction and Synchronous motors due its superior performance, efficiency and controllability. Normal voltage source inverters are suitable only for three phase drives. Cascaded multi-level inverters are used to improve the power quality. The Hexagram inverter h...

This article reports on the design and practical development of RF co-designed MMIC components that exhibit function a bandpass filter an isolator. They are based cascaded non-reciprocal frequency-selective stages (NFSs), one-pole/two-transmission zero (TZ) multi-resonant stages, impedance inverters. The combination these results in two-port network exhibits nonreciprocal quasi-elliptic (NBPF) ...

In recent times, multilevel inverters (MLIs) are gaining popularity for grid integration of distributed power generation sources. this paper, a proportional-resonant (PR) controller based on current control logic is proposed single-phase eleven-level inverter topology, enabling the sources into grid. The presented topology utilizes eight two-quadrant switches and three dc to produce an output v...

As demands for energy savings have increased in recent years, inverters are being used in a wider range of applications. Demands for lower cost, smaller size and higher efficiency will continue to further expand the range of inverter applications. However, as a trend toward eco-friendly products increases, some sort of measure is necessary to suppress the harmonics contained in the inverter inp...

In this paper, the authors have done a processing of experimental data for the generated output power of two photovoltaic parks by means of different methods. An approximation of the data is done for the output power during a good day (with maximum solar radiation) by a Sum of Sinusoidal Functions, and during a bad day (small solar radiation) by a sum of Gaussian functions. The paper presents a...

Multilevel inverters have an attracted a great deal of attenuation in medium voltage and high power application. Due to their lower switching losses, EMI, high efficiency. Among the several multilevel inverters topology it is more attractive due to the simplicity of control. This paper proposes to CHMLI output voltage level is increase to reduced total harmonic Distortion. Hence the paper mainl...

We propose a design theory of the miniaturized high temperature superconducting (HTS) coplanar waveguide (CPW) bandpass filter (BPF), which is composed of meanderline quarter-wavelength resonator, Jand K-inverters. The Jand K-inverters are realized by using interdigital gap and meander-shape inductor. To evaluate the kinetic inductance of the K-inverter, we fabricate the YBCO resonator connecte...

In this paper a resonant tunnelling quantum well infrared photodetector (RT-QWIP) is discussed. Each period of this photodetector structure comprises of a resonant tunnelling structure (AlAs/AlGaAs/AlAs) nearby a quantum well (AlGaAs/GaAs). In this photodetector, photocurrent is produced when an electron makes a transition from the ground state of the well to an excited state which is coupled t...