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This paper presents the suppression control of the source current harmonics of the bi-directional isolated AC/DC converter. The proposed circuit consists of three-phase AC to high-frequency single-phase AC matrix converter, high-frequency transformer, and single-phase AC to DC converter. The authors have achieved the soft-switching of all commutations of the both converters. The further downsizing...
This paper presents a new dynamic residue amplifier for pipelined ADCs. With an input of 100mVpp, diff and 4x gain, it achieves −100dB THD, the lowest ever reported in dynamic amplifiers. Compared to the state-of-the-art, it exhibits >25dB better linearity with >2x larger output swing and similar noise performance. The key to this is a new linearization technique based on capacitive-degeneration...
This research proposes technical and financial evaluation for investment of harmonic mitigation in power network. Main proposal of research is analysis of harmonic impact and harmonic solution by regarding to economic decency for investment. The parallel resonance is harmonic impact that will be mentioned in this research because it is a problem that is mostly emerged in industries that contain non-linear...
This study investigates the cell voltages and arm currents in double-star modular multilevel converters (DSMMCs) based on power balance and current tracking control law. DSMMCs have been widely applied to static synchronous compensators, high-voltage direct-current transmission, back-to-back power transfer systems, wind/solar power generation and battery storage systems. The size of capacitors in...
The paper is concerned with aspects related to the reactive power compensation capacitors influence over the current and voltage distortions. This work aims to discover if the use of capacitors for the reactive power compensation have more drawbacks than positive effects. A solution of compensation is modeled and simulated in the MATLAB/Simulink software environment. The compensation algorithm is...
This paper compares three simulation methods to simulate the Γ(t) functions used in the PPV theory. The first method consists in a modified version of procedure used for the simulation of the Γ(t) functions in the sense of ISF, the second and the third are based on non-linear analysis and allow directy to calculate the Γ(t) in the sense of PPV. Despite the approaches are not formally equivalent they...
Many efforts have been made to improve the performance of power electronic systems with active capacitive DC-link module in terms of power density as well as reliability. One of the attractive solution is an active capacitive DC-link with the series-connected circuit because of handling small-rated power. However, in the existing control method of this circuit, the DC-link current of the backward-stage...
Due to the low inductance of an LCL-filter, the grid current generated by an LCL-filtered Voltage Source Inverter (VSI) is sensitive to low-order grid-voltage harmonics. This issue is especially tough for the control system with Inverter Current Feedback (ICF), because the grid-current harmonics can freely flow into the filter capacitor without control. To cope with this issue, this paper develops...
Active neutral-point clamped five-level (ANPC-5L) converter is an attractive topology for 1500V photovoltaic generation system. In this paper, a novel and reliable modulation strategy for the active neutral-point clamped five-level inverter, including the balance control strategy of the flying capacitor voltage are proposed. In order to improve the harmonic characteristics of the output current and...
This paper presents a design approach for the output matching networks (OMN) required in continuous class B/J power amplifiers (PA). Design equations of the OMN are derived and used to design a class-B/J PA that covers the frequency band from 2.2 GHz to 3.45 GHz. The PA uses the LDMOS device available in the 130 nm SOI technology from STMicroelectronics. Simulation results show that the PA has an...
This paper presents a widely tunable balanced-to-unbalanced (balun) bandpass filter (BPF). The proposed balun uses two 2-port N-path BPFs with embedded quadrature phase shifting to achieve the single-ended to differential conversion. Analytical expressions for the in-band (IB) differential to single-ended (DS) and single-ended to differential (SD) voltage gains are derived and validated. A prototype...
The object of the research work is the multilevel high-voltage converters with Cascaded H-Bridges (CHB) controlled by two different methods. They are the sorting algorithm and the fundamental harmonic displacement method. The comparison was carried out on the basis of mathematical modeling for the case of cascade connection of 10 cells with the rated voltage on the capacitors equal to 1000 V. Such...
A simplified equivalent circuit of electric powertrain system of hybrid electrical vehicle (HEV) is proposed to research and investigate into the impact of pulse width modulation (PWM) strategies of voltage source inverter (VSI) on the DC-link capacitor in HEVs. Then, analytical solutions to the switching function are introduced based on space vector PWM (SVPWM) and discontinuous PWM (DPWM) schemes...
The paper presents a system that allows the passive reduction of noise and vibration of a three-phase induction machine with a stator damper winding connected to capacitors. This is a simple and effective system for reducing the flux density harmonics of a machine. The theoretical study is based on the equivalent circuit of a machine equipped with the damper winding and the modeling is based on the...
Energy conservation is extremely important for the future of mankind. Energy derived from fossil fuel has serious environmental consequences and this needs attention of researchers as well as end users. Renewable energy is attractive but at the same time, fossil fuel based energy cannot be abruptly abandoned. In addition to encouraging use of renewable energy sources, the author of this paper believes...
In this paper we propose a second-order harmonic-enhanced circuit design in an energy harvesting receiver. For accurate location detection, a LC resonator together with harmonic-enhanced coupler is placed after a dual-band Yagi-Uda antenna. This design helps the beamforming power transmitter to do maximum power transfer when an EH-receiver moves into the power transfer coverage region and its stored...
This paper presents the design and simulation of an auto-tuning capacitive power transfer (CPT) system based on Class-E converter approach. The reason of selecting Class-E converter is due to the remarkably high efficiency that it can achieve. However, the load's variation affects the output voltage of Class-E converter significantly and increases the switching loss of the system. To regulate the...
Renewable energy is gaining more attention because conventional power plants are facing several environment problems. In the present scenario, wind power grid interfacing is one of the favorable approaches for electricity production. This paper introduces the MATLAB modeling and simulation of 5-Level and 3-Level neutral point clamped inverters for grid interfacing using SEPIC converter for wind energy...
This paper presents mainly on the basis of open loop L-Z source inverter. By using the power electronics converter the distributed generating system is connected to the grid. In that by adding inductance and diode to the input side of power electronic converter the input voltage to be boosted and eliminates the ripples in the input current and reduce the inrush current. In the distributed generating...
This paper presents the design and analysis of a cost effective power quality improvement method using de-tuned filters for an electric power distribution network. Analysis of the resonance at different harmonic components such as 5, 7, 11 and 13, as well as power factor (PF) improvement has been carried out by a capacitor bank. By connecting a capacitor bank will produces harmonics amplification,...
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