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Multilevel inverters generate low harmonic waveforms at the output, which makes them suitable for high voltage energy conversion scheme to deliver efficient high power to the loads from renewable energy sources like photovoltaic systems which are penetrating to the electric grid nowadays, significantly. In this paper a single-phase hybrid multilevel inverter based on cascading full bridge and half...
Nowadays, the multi-level voltage source inverter (MLI) has widely used in industries due to its ability to generate high voltage staircase waveform which its magnitude, phase and frequency is controllable, Whereas, MLIs introduce harmonic to the network would led to power quality problem. This paper presents a novel meta-heuristic method known as Memetic algorithm (MA) to optimize harmonic contents...
With energy efficient power systems and the increasing capacity requirements, chain SVG more widely and gradually become a hot research. SVG device in order to achieve high-performance real-time control, Modulation technique is an important part of the chain of SVG, this paper discusses a single-stage multiplier CPS-SPWM technology superiority to DSP28335 as the main chip, single-stage multiplier...
According to increased industrial loads, active power filters have been used a lot to compensate harmonics and reactive load current components. In this paper a new control method with grid power factor control is proposed for three phase active power filters. In the proposed control method the grid current amplitude is calculated based on the well known power balancing method. The phase of this signal...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
The bridgeless power-factor-correction (PFC) converter possesses higher efficiency than the conventional boost-type PFC converter due to its reduced conduction voltage drop and conduction loss. The conventional multiloop control needs to sense the input current to yield the desired sinusoidal current waveform. This paper presents a control method for bridgeless PFC converter to provide sinusoidal...
This paper proposes an improved modulated carrier control for single-phase shunt active power filter, which eliminates harmonic and reactive currents at ac sources drawn by nonlinear loads. This control method directly shapes line current to be sinusoidal and in phase with grid voltage by comparing a modulated carrier signal to the average line current and making duty ratio doubled. Since the line...
This paper investigates the dc link voltage ripple in a modular multilevel converter (MMC). It is found that switching-frequency ripple occurs on the dc link voltage in MMC when circulating current suppressing control is implemented. The mechanism of the switching-frequency voltage ripple is investigated and explained. Circulating current suppressing control will manipulate the average values for...
Due to wide use of power electronic components in an electrical systems, the harmonic distortion is considerably increased. The Shunt Active Filter act as a solution to mitigate the current harmonics produced due to the presence of nonlinear loads. This paper aims at reducing the Total Harmonic Distortions(THD) and reactive power compensation under different loading conditions. The instantaneous (Id-Iq)...
Proliferation of non-linear loads resulted in the problems of harmonics, unbalancing, poor power factor. To overcome this active power line conditioner (APLC) is used. In this paper, an artificial neural network (ANN) based controller for active power line conditioner is presented, in which feedforward neural network, trained by levenberg marquardt (LM) algorithm is implemented for generating reference...
High frequency distribution has more advantages than its DC counterpart. In order to obtain a high frequency power source, a switched capacitor (SC) based multilevel inverter has already been discussed by authors. However, the proposed SC based inverter has a demerit that is an unbalanced energy extraction to power source. Although several switching strategies have been examined to overcome the unbalanced...
This paper presents a single-phase Power Factor Corrector (PFC) based on the Sheppard-Taylor topology suitable for welding applications. In order to ensure unity power factor at the input AC mains, a Pulse-Width-Modulated (PWM) control is developed. The input inductance of the proposed converter works in discontinuous current mode (DCM). Major favorable features of this converter like inherent short-circuit...
This paper proposes a new scheme to generate reference voltage for a existing DSTATCOM operating in voltage control mode (VCM). The proposed method provides DSTAT-COM an energy conservation (EC) feature while enhancing its power quality (PQ) improvement capability without using any extra circuitry. With this scheme, power drawn by the load decreases which reduces the tariff, reduces heating losses...
A comprehensive discussion and an analysis of a practical and low cost controlling scheme for Active Front End (AFE) based on Space Vector PWM (SVPWM) technique would be presented in the paper to achieve the objective of reducing the Total Harmonic Distortion (THD) of the line current at the Point of Common Coupling (PCC) of a utility.
In, this paper, single phase AC to AC converter using pulse width modulation (PWM) is presented to control the voltage of passive R-L load. The presented AC chopper consist four IGBT switches to control the voltage across the load. The performance characteristics of PWM AC chopper using simulation and hardware are presented in this paper.
Harmonic analysis of LLC Resonant Converter for high power DC-DC conversion is presented in this paper. Performance of LLC resonant tank to filter the harmonic contents from the square wave voltage applied to the switching elements IGBTs is analyzed through simulation. The DC-DC Converter consists of inverter and rectification stage with capacitive filter. The system is operated in closed-loop control...
PFC controllers usually need three sensors. A digital implementation with pre-calculated duty cycles can reduce the number of sensors. The disadvantage of using pre-calculated duty cycles is that power factor is very sensitive to any non-idealities, so some kind of regulation is necessary. A single ADC and single loop technique is proposed and it obtains a high power factor under non-nominal conditions.
This paper presents a technology review of Modular Multilevel Converter (MMC) which becomes a popular series of topologies and has been applied in industrial applications in recent years. This paper convers summary of key aspects of the MMC, including modeling, modulation approaches, circulating current control, voltage balancing control and system control algorithms. In addition, those converters...
Optimized Harmonics Stepped Waveform Pulse-Width Modulation(OHSW-PWM) for high voltage high power cascaded multilevel inverter with equal DC sources are commonly used in constant frequency utility applications. Stepped switching angles for cascaded multilevel inverter are calculated by solving nonlinear equations to eliminate preselected lower order harmonics. This paper proposes a generalized method...
This paper presents a novel control strategy of AC/DC power converters. The proposed control algorithm is based on Sliding Mode Control methodology. The basic idea is to apply feedback implementation of pulse-width modulation (PWM). The method exhibits low sensitivity to disturbances and fast dynamic performance in addition to the main converter properties. The proposed sliding mode control method...
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