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Since the capacitor equivalent series resistance (ESR) above 1kHz almost stays constant, dc-link current root-mean-square (RMS) closed form equation is an easy way to evaluate the capacitor losses from the switching harmonic currents (SHCs). But when the ac current contains multiple low order harmonics (LOHs), their impacts on the dc-link has not been systematically studied. In this paper, a straightforward...
This paper describes a three-phase shunt active power filter (APF) with improved dynamic parameters. The objective of this solution is to reduce the value of total harmonic distortion (THD) ratio of the power supply line. A predictive control algorithm is implemented in the control circuit, allowing to react in advance to predictable load changes and to reduce dynamic distortion. For loads with unpredictable...
Compared with the conventional central shunt active power filter (SAPF), modular designed SAPF can track the harmonics more precisely and quickly with a compact and expandable structure, which makes it a better solution for harmonic mitigation. But there are very few paper discussed about the modeling and parallel resonance issues of modular SAPF parallel system. This paper provides a modeling of...
A topology of series active power filter (SAPF) based on a single phase half-bridge cascaded multilevel inverter is proposed to compensate voltage harmonics of the load connected to the point of common coupling (PCC). The main parts of the inverter are presented in detail. Any voltage reference can be easily obtained by a simple control with the proposed inverter. Therefore, the inverter acts as a...
Traditional 2-level voltage source inverter (VSI) based active power filters (APF) has a high DC voltage across the capacitor. A pure APF connected to a 3-ϕ 400V line voltage, will have a DC voltage of more than 600V for its effective working. Active switches in the inverter subjected to this voltage, results in a high voltage stress. Multi-level inverter topology in APF reduces the voltage stress...
This paper introduces an application of active power filter (APF) in photovoltaic (PV) renewable energy system for power quality (PQ) improvement. The PV energy system is connected to Saudi Arabia National Grid (110/13.8/0.4 KV) via inverter circuit, transmission line and step-up transformer. The harmonics due to the inverter circuit and non-linear local load are mitigated and reduced using shunt...
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 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, the power quality of microgrids is addressed. To achieve the desired level of power quality, a strategy based on the coordinated control between DGs and APFs is proposed. In this regard, hierarchical control is applied where primary control consists of power droop controller of DGs, selective virtual impedance and voltage/current regulators. Based on the secondary control, at first...
This paper presents a sliding mode voltage controller in order to regulate the dc-link voltages of a three level neutral-point-clamped (NPC) inverter of a shunt active power filter. A Lyapunov function is used to determine sliding mode control laws that guarantees the stability of the control system. Also a selective harmonic extraction method is employed in the control system to compensate desired...
In this paper, a new method is proposed to control the interface Inverter of distributed generators (DGs) in a microgrid. The objective of this method is to effectively compensate for the harmonic currents at the Point of Common Coupling (PCC) and the MG with the Absence of dedicated compensation devices, such as Active Power Filters (APFs). The proposed control method is composed of the Adjustable...
The paper presents a single phase grid integration of a shunt connected Photovoltaic (PV) generator. The objective of the proposed system is to provide uninterrupted power supply to the load during both strong sunlight as well as at night or at cloudy conditions. The interface between the grid and the PV is carried out through a Voltage Source Inverter (VSI), eliminating the current harmonics and...
Declining solar prices have led to large scale adoption of solar inverters. Presently, many industries use their solar installation only for active power generation, and not for other possible applications like grid harmonic eliminations or support. This results in reduced utilization. High harmonics generated due to non-linear and switching loads is a typical problem for industries, particularly...
Active power filters have been used to eliminate current harmonics generated by nonlinear loads, because such loads decrease the power quality, but with the growing use of renewable energy sources interconnected to the grid is possible integrate the function of the active power Alter to the grid-connected photovoltaic-system, the functions in a single device. Due to the before mentioned the use of...
One of the most important power quality issues is related to current harmonics generated by nonlinear loads such as diode and thyristor front-end rectifiers. The hybrid power filter (HPF) mixes low power rating active power filter (APF) with passive filters. Recently, some APF topologies based on dual converters configurations have been shown to be very attractive where it must deal with highly nonlinear...
Due to the rapid increase of nonlinear and unbalanced reactive loads in 4-wire distribution systems, various power quality issues such as harmonics current, unbalanced load currents, neutral current and low power factor occur. The need for green and renewable energy sources increases daily due to increase in demand for electrical power. Photovoltaic (PV) energy is an important renewable technology...
In open-end winding AC motor drives, terminals of stator phases are normally connected between two inverters, normally, of the same type and size. In the present paper, an alternative configuration is studied where the machine is supplied exploiting two different converters: a main multi-level inverter and an auxiliary two-level inverter. The last operates as active power filter in order to eliminate...
This paper presents comparisons of active power filter (APF) and hybrid power filter (HPF) systems. Despite numerous studies on the two filters, there is not clear analysis between their differences and the HPF features. This paper analyzes the HPF inverter along with passive power filters (PPFs) and their effects on the power factor at the grid. Additionally, a theoretical analysis and systematic...
A Hysteresis current control (HCC) modulation is commonly used because of its various advantages. However, the HCC modulation has the disadvantage that the modulation frequency varies in a fixed band and, consequently, produces non-optimum current ripples. To overcome this drawback, an adaptive hysteresis-band current control (AHCC) modulation has been suggested. However, when the AHCC is employed...
The increase in non-linear loads in the electrical network deteriorates the voltage waveform quality. One of the most used methods to correct the quality lack is to use shunt, series or mixed topologies of active power filters. Mixed filters can compensate loads that generate voltage harmonics and current harmonics, but the economic investment is high. Commercial shunt filters are more widespread...
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