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In this paper the grid harmonic resonance on long lines is studied, in particular the resonance phenomena between the grid series inductance and the line parallel capacitor. Later, the resonance is attenuated by using a renewable energy generator. Experimental results are depicted and the conclusions are stated.
The hybrid active harmonic filters use a series capacitor in order to reduce the voltage rating of the inverter compared to regular inductive-coupled active filters. Different control strategies are applied on this topology in the literature. The main contribution of this paper is to apply a H-infinity controller in order to achieve current tracking in voltage source inverters connected to the grid...
This article presents the simulation and harmonic analysis of a charging station model developed in “Modeling and protection of electric vehicle charging station”, which was adapted with the electrical parameters of the distribution system of Cuenca city, with The purpose of quantifying the amount of harmonics that this type of stations can produce in the network. The simulation resulted, that the...
An increased deployment of distributed generation in recent years has contributed to creation of meshed power networks usually seen as a way to improve power flow management capability. Also, power electronics converters have been commonly used to interface distributed resources to the grid, yet their impact on the network stability has not been sufficiently explored. In this paper the stability of...
This paper proposes a generalized logic-based method for fault diagnosis in multilevel inverters that can be integrated with reconfiguration methods. Thus, both effective fault diagnosis and fault tolerance can be accomplished. To validate such integration, the proposed fault diagnosis method is applied to a five-level neutral point clamped inverter with three reconfiguration methods proposed in the...
In most of the power electronics inverters it is desired to produce clean sinusoidal waves without the use for any filtration in the output. This topic gathered the attentions of many researchers because it helps reduce the cost of the inverters. This paper presents floating source multilevel inverters that utilize double switching frequency modulation technique. This modulation method consists of...
This paper presents a new DC-AC Interconnected Modular Multilevel Converter (IMMC). The proposed converter produces a sinusoidal output with adjustable voltage and frequency (v/f) suitable for powering AC motor drives. The output voltage/frequency can be varied over a wider range. The proposed converter is a promising candidate for high performance ac motor drives and has the following advantages:...
The international standardization community is currently reviewing the harmonic distortion limits in the frequency range 2 to 150 kHz, referred to as supraharmonics. Power electronics has emerged as a ubiquitous technology, which also plays a critical role in this subject. Broadly speaking, the reduction of emission in the lower-frequency ranges appears to result in an increase in supraharmonic emission...
This paper addresses harmonic magnification due to resonance circuits resulting from interaction between uncertain grid impedance and converter. The source of harmonic may be either the grid or inverter. It is demonstrated that unknown and unpredictable grid impedance may result in variable resonance frequency, which challenges robust design of LCL filter of inverter.
The article deals mathematical description of a bidirectional three-level neutral point clamped (3L NPC BtB) converter with a voltage source rectifier (VSR) and a voltage source inverter (VSI). The developed mathematical description allows to analyze electromagnetic processes and to assess electromagnetic compatibility (EMC) in the system ≪Grid — 3L NPC BtB converter — Load≫ taking into account the...
This paper proposes the modeling of the single-phase full-bridge inverter as a linear high order system integrating both the input voltage and load variations as disturbances. The model considers the output voltage to duty cycle transfer function (TF) as the plant of the control system when the converter operates using constant frequency Pulse Width Modulation (PWM). A simple nested loop controller...
The paper presents a fuel saving, adjustable speed, autonomous generation system providing fixed amplitude and frequency sinusoidal voltage. A permanent magnet generator, driven by a Diesel engine, delivers variable frequency and amplitude AC voltage whereas an AC/DC/AC converter produces demanded voltage. Autonomous generation system is dedicated to the AC microgrid as the basic and continuous source...
The whole world is focusing on the utilization of renewable energy sources in order to mitigate the world power crisis. Power electronics is being used in a large scale for the renewable energy conversion in a more efficient manner. It has a great impact on controlling as well as interfacing the renewable system with both the grid and standalone applications. Hence more and more emphasis is given...
In order to solve the distribution of voltage quality problems, this paper presents a new voltage regulation control strategy of distribution network based on switched affine model. By establishing the state space equation of the controllable series voltage regulation device, using the method of Lyapunov function and quadratic stability theory, according to the convex combination stability theory,...
In this paper we propose the structure and the functioning of a photovoltaic (PV) connected to the electric distribution and transmission network, equipped with the malfunction detection blocks. The studies that were carried focused on the injection of a power of 16 KW, produced by a PV panel field, on the electrical network of medium voltage (25 KV). In order to the reliability of the injection system...
This paper presents the design of a single phase DC/AC Converter or Inverter for home scale electricity systems powered by renewable energy such as photovoltaic system. The power converter is controlled using a microcontroller. The inverter system is firstly modeled and simulated using SPICE, before we design it. A control software, implementing Sinusoidal Pulse-Width Modulation (SPWM) signal generator,...
The aim of this paper is the study and implementation of the start-up process of a shunt active compensators. This process is divided in two steps: the passive charging of the compensating capacitor accomplished by the inverse diodes of the compensator power inverter and the active charging of the capacitor, using the IGBTs. The second step can be implemented in many ways, with different ratios of...
Energy generation via Photovoltaic (PV) technologies has increased in the last years. Large scale PV generation have attracted interest among countries due to low operation cost and wide PV resource disposition. However, some operative challenges in large scale PV plants had been detected: power imbalance, low power quality in terms of total harmonic distortion (THD), power factor and conversion efficiency,...
The increase in the power demand is growing rapidly and the use of power electronics technology is considered a must. However, the injected harmonics caused by the power electronics devices affect the power quality negatively. Besides, the switching losses in the transmitted power is another issue that should be taken into the account. This paper presents an optimization of a novel carrier-based power...
The newly available Medium Voltage (MV) Silicon-Carbide (SiC) devices enable a great extension of the design space of MV inverters. This includes the utilization of unprecedented blocking voltages, higher switching frequencies, higher commutation speeds, and high temperature operation. However, all these factors considerably increase the insulation stress. This paper details the computation of dielectric...
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