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Conergy power converter is among single-phase transformer-less topologies that have been proposed to mitigate the leakage current problem in photovoltaic (PV) systems. It is an NPC derived structure, which significantly reduces the leakage current and improves the efficiency. Conergy includes fewer switches compared to other single-phase transformer-less topologies. The reactive power generation capability...
The paper deals with the implementation of a Multi-level inverter which is based on cascaded half-bridge, producing a 31 level output with high power quality. This paper primarily focuses on generating high level inverter output with optimal number of switches. Fundamental frequency switching method is adapted to trigger the MOSFETs for output voltage level control. Level generation circuit produces...
This paper presents a low power DT sigma-delta modulator for wide variety of sensor application using a ring amplifier for SC-integrator. The topology is a second order modulator with single-bit quantizer. Dead-zone effect of the ring amplifier in oversampling ADC is discussed. The fabricated test chip in 65nm CMOS process achieved SNDR of 62dB and 1MHz signal band at sampling frequency of 102.4MHz...
The main problem shown in the paper is effective control of semiconductor converters, which are used in various applications. Nowadays for the converter control purposes the pulse-width modulation algorithms are applied. But such algorithms does not provide effective converter operation, and it energy characteristics is low-leveled. Combination of pulse-width modulation with control signal premodulation...
In this paper, we present a frequency analysis of a compensated impedance inverter and its effective implementation in the context of high-power Doherty amplifier (DPA) design. On the basis of an idealized DPA model, we calculate the expected operative bandwidth and the corresponding maximum drain efficiency as a function of the modulated signal statistics. In addition, we introduce an effective technique...
The power conversion is one of the major requirements in utilizing the Electricity generated from the Solar Energy. This paper involves the boosting of DC output of the solar panel by Super-Lift Luo Boost Converter. The converter employs the Super-Lift technique to obtain the boosted output voltage. The output voltage of the Super-Lift Luo Boost converter increases in geometric progression. The Super-Lift...
In this paper, comparison between two different Pulse Width Modulation (PWM) techniques employed for three phase voltage source inverter (VSI) is discussed. The three phase voltage source inverter is basic topology used to supply a grid. In this paper we have design a LC filter between the inverter and the grid in order to stabilize the output voltage. The filter gives sinusoidal three phase voltage...
Analysis of different modulation techniques for multilevel inverter is discussed. To control the multilevel inverters, different modulation techniques have been used. Amongst them multi carrier Sine Pulse Width Modulation (SPWM) techniques are widely used for different multilevel inverter topologies. These modulation techniques are derived from the conventional two level inverter SPWM technique. Different...
This paper proposes a three phase seventeen-level inverter for grid-connected photovoltaic systems, with a novel pulse width-modulated (PWM) control scheme. The proposed topology constitutes the conventional three-phase bridge with three bidirectional switches. A multilevel dc link using PV cells and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output...
Inverters are used in wide area of interests including household and industries. But in many aircraft applications, industrial applications and microgrid applications, where a renewable energy sources such as photovoltaic, wind, fuel cells etc are used, the classical three level inverters cannot be used due to polluted sinusoidal output. In order to overcome this difficulty multilevel inverters are...
A basic unit configuration which uses very less number of switches for obtaining an asymmetric multilevel inverter is proposed in this paper. Even and odd voltage levels at the output can be achieved by adding a conventional inverter bridge circuit to basic unit. Asymmetric configurations have different value of dc sources, so large number of levels will obtained at the output with reduced number...
The proposed system explains the inverting operation of DC voltage to AC simply using only three switches. The power demands increases day by day but the sources are limited. A micro grid is benign source of power with various renewable energy resources. The proposed topology has a high frequency rectified sine modulated switch with two symmetrically operated line frequency switches in the front end...
In this paper, an attempt to implement auto synchronization technique using Charge Pump Phase Locked Loop (CPPLL) for grid connected solar photovoltaic system (SPV) has been made. The main aim of this paper is to reduce the phase angle mismatch between the grid voltage and inverter voltage, which in turn would improve the quality of power delivered by eliminating the unwanted islanding condition....
Nowadays multilevel inverters are promising as a new breed in high/medium voltage and power applications. Number of modulation techniques is available for controlling the multilevel inverter but multi-carrier pulse width modulation (MCPWM) techniques are frequently used due to its simplicity and easy implementation. In this paper simplified simulation modeling of various MCPWM techniques are proposed...
In this paper, a novel three phase modular multi-level inverter (MMLI) is proposed. The proposed inverter consists of primary cell and repetitive modular cells which are connected in series arrangement with the primary cell. Therefore, the proposed topology is able to get more output voltages levels number by adding extra modular cells. Both the sinusoidal pulse width modulation (SPWM) and staircases...
Simultaneous generation of two AC outputs at different frequencies from a single-phase inverter offers practical benefits and control flexibility for many industrial applications. In this paper, a dual-frequency selective harmonic elimination (DFSHE) modulation method is proposed to generate and control two individual frequencies in an H-bridge, while diminishing undesired harmonics. Two AC elements...
In this paper, the methodology to analyze Non-Detection Zone (NDZ) of islanding detection algorithm for multiple Power Conditioning Systems (PCSs) connected to grid is proposed. The PCSs with renewable energy source or battery energy storage system are equipped with anti-islanding functionality and the method using frequency positive-feedback is one of the most popular methods to detect islanding...
This work proposes a digital implementation concept for a synchronous optimal pulse width modulator (SOP) exemplarily used in a three-phase 5-level NPC H-bridge inverter driving a permanent magnet synchronous motor at variable speed. The numeric optimization is performed offline and the resulting information that defines the inverter output waveforms are stored in a look-up table. The real time portion...
This paper presents a general and yet fast multilevel space-vector modulation technique, based on orientation of reference point in terms of hexagon lines. The main advantage of the proposed algorithm is the reduced volume of calculations that consequently makes it possible for implementing on cheaper microprocessors. The introduced technique in finding the reference vector location is extended to...
This paper presents a soft-switched discontinuous pulse-width pulse-density modulation (PWPDM) scheme to decrease the switching losses of the capacitor-less high-frequency pulsating dc-link (HFPDCL) inverters. The proposed modulation scheme employs both pulse-width modulation (PWM) and pulse-density modulation (PDM) schemes to increase the overall efficiency of the inverter and generate high-quality...
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