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This paper presents design and performance of high power quality single-phase grid inverter that fed from photovoltaic (PV) system through maximum power tracker for residential application. The proposed designed inverter is based on sinusoidal pulse width modulation (SPWM) technique in combination with series-resonance and high-pass filters at low side of inverter. The filters and SPWM are designed...
Nowadays, the increase in nonlinear loads has contributed to the generation of harmonics in the source current which in turn causes low power factor and disturbance in the power system. Active power filters (APFs) are known to provide one of the solutions to this harmonic related issue. Various types and configurations of APFs and control have been reported in literature. This paper proposes the integration...
In this paper a space phasor based hysteresis current controller (SPHCC) is proposed for Shunt Active Power Filter (SAPF) based on 2-level inverter. All the inherent advantages of space phasor based approach remains intact in it including optimal voltage phasor switching and reduced average switching frequency compared to that of a conventional On-Off HCC. Computation of online current error boundary...
This paper presents modelling of a hybrid micro grid, consisting of two DG such as photovoltaic cell and a fuel cell. The micro grid comprises DGs, nonlinear loads, storage devices and operates either inter connected or isolated mode from the main distribution grid. Here for the voltage source inverter (VSI) based micro grid the controllers are designed, using various control strategies such as PQ...
The increasing use of nonlinear loads entails serious electrical energy quality problems in power grids. In this regards, the Three-level shunt active power filter (SAPF) is proposed. The considered SAPF is constituted by an AC/DC Three-level NPC inverter. This latter is connected to the point of common coupling (PCC) through a high order filter instead of conventional filter L. Indeed, a new model...
For grid-connected inverters (GCI), switching harmonics can be effectively attenuated through some methods. This paper present an advanced current control method for GCI of distributed generators (DGs), which responsible for the DG to controlling the power injection to the grid and the cancellation of the harmonics in Microgrid (MG) and between MG and Power Common Coupling (PCC). The current harmonics...
The use of renewable energy such as solar is nowadays exceptionally used in electrical systems due to increasing on power demand. Thus, power electronic converters are widely used to perform the required energy conversion. However, the device such as multilevel inverter (MLI) is designed without harmonic-less. This phenomenon will create power quality problem such as increases in total harmonic distortion...
In this paper, a droop control strategy is presented for accurate power sharing between parallel connected inverters in an AC microgrid in autonomous mode. The proposed strategy is based on the droop control techniques P-f/Q-V and P-V/Q-f, with a virtual impedance and using monitored quantities directly at the inverter. This droop control approach can be used in microgrids where communications are...
Active power filters are used to improve the energy quality of the electrical distribution networks by the harmonic elimination and correcting of the power factor. However, many conventional configurations of active filters are constituted by a significant number of semiconductors that generate a crowded installation with a complicated control, high cost price of his designs and power losses due to...
This article presents two methods for the compensation of harmonics generated by a nonlinear load. The first is the classical PI controller. The second is the modern controller by Fuzzy ogic Tyie-1. Both methods are applied to a shunt Active Power Filter (sAPF) based on a three-phase voltage converter at five levels NPC topology in series with P-Q algorithm. The results give us clear that the rate...
The nonlinear loads generate harmonic currents which distorts the power quality in the distribution network, so it can be considered as a pollutant which pollutes the entire power system. To overcome problems due to harmonics, Shunt Active Power Filters are used as a solution. In this present work, Synchronous Reference Frame algorithm is selected to extract the harmonic components, Fuzzy Logic Controller...
This paper presents a novel control scheme for unified power quality conditioner (UPQC) based on three-level neutral point clamped (NPC) inverter using fuzzy logic and Ann's for controlling respectively series and shunt APFs. The proposed UPQC is able to mitigate source current harmonics and compensate all voltage disturbances. It is designed by the integration of series and shunt active filters (AFs)...
Switching frequency is one of the main deciding factors in development of high power converter systems used in industrial applications. This paper aims at verifying the switching frequencies range between 9kHz and 20kHz by selecting and designing the inductor of the output LC filter for each switching frequency within that range while optimizing the weight and power loss of the overall power converter...
This paper presents a control method for hybrid active power filter using Space Vector Pulse Width Modulation (SVPWM). In the proposed control method, the Active Power Filter (APF) reference voltage vector is generated instead of the reference current, and the desired APF output voltage is generated by SVPWM. A MATLAB code is developed to generate the SVPWM switching pulses fed to the two-level inverter...
In this paper an improved control method is proposed for space phasor based Hysteresis Current Controller. For medium voltage application, Shunt Active Power Filter (SAPF) using this improved controller will be able to meet the strict power quality standards. In a grid connected system, nonlinear loads using semiconductor devices pose a serious threat to power quality and there this proposed controller...
This paper focuses on the performance analysis of a single-phase inverter, in H-bridge configuration, implemented with silicon carbide (SiC) transistors, which includes an active power decoupling solution that does not require additional power semiconductors. The system is investigated in terms of voltage and current stress and how the efficiency is affected in comparison with the conventional H-bridge...
This paper is focused on the optimal design of the controllers in an active filtering and regeneration system for DC railway traction substation. The control algorithm of the system is based on the indirect current control method and uses two closed loops with PI controllers: an outer one for the DC voltage control and the other for the grid current control. In order to perform the energy regeneration...
This paper will discuss the modeling of three-phase four wire active power filter (APF) for Quaid-e-Awam University College of Engineering Sciences and Technology (QUCEST) Campus at Larkana, Pakistan. The control strategy of the APF is based on the Unit Vector Template (UVT) method and Instantaneous Reactive Power (IRP) theory. The function of UVT method is for obtaining the voltage signals for the...
The use of series connected capacitors for high voltage applications has been proven to be beneficial for voltage stress reduction across power semiconductors. In a 3-phase grid any asymmetry in the value of the series capacitance may lead to significant variations in the voltage seen across the low voltage converter. This paper investigates the effects of an unbalanced set of series connected capacitors...
In this paper, a new configuration of a multi-functional grid-connected inverter is proposed to improve both voltage-based and current-based power quality issue. By implementing bidirectional switches using semiconductor devices, a multi-functional grid-connected inverter can be connected in series or parallel to the grid and provides three modes of operation. This paper presents the control scheme...
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