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This paper presents a unified selective harmonic compensation strategy using DG-interfacing inverter with LCL filter in the presence of nonlinear local loads for both grid-connected and islanded microgrid. Compared with the existing harmonic compensation methods in the literature, the proposed strategy consists of a triple-control-loop in the grid-connected mode to compensate the grid current harmonics...
Aim of this paper is to check a feasibility of utilization of Recursive Least Square (RLS) and Goertzel algorithms for harmonic component calculation. These methods are utilized within Active Power Filters (APF) which compensate higher harmonics present in the power grid. This paper is not focused on describing methods for generating the harmonic compensation current. Our goal is only to consider...
This paper presents a flexible harmonic domain (FHD) model of a three-phase photovoltaic (PV) system aimed at steady-state analysis. The proposed FHD model involves a PV array Thévenin equivalent, a DC-link capacitor, a boost converter, a three-phase inverter, an LC low-pass filter-bank, a PI-shaped distribution line, and a nonlinear load. The FHD PV model is able to include an arbitrary number of...
Shunt active power filters (SAPF) generally compensate harmonic current of centralized non-linear loads, which may cause undesired economical burden for networks with distributed harmonic sources. This paper proposed an SAPF predictive control method based on online impedance measurement which can suppress the network-wide harmonics systematically in an optimized way.
It is conceivable that the future fleet of US Navy vessels will deploy multiple high power AC and DC loads that must be reliably energized. Integration and operation of AC and DC loads will likely be achieved using an intelligently controlled microgrid architecture that is able to actively regulate and distribute power from both AC generation sources and DC energy storage devices. Some future loads...
Interior permanent magnet synchronous motors often work under flux weakening state in electrical vehicles for higher speed but faults, such as overcurrent and overvoltage, might occur during that process, after which the power transistors are closed immediately and the battery packs are charged through three-phase uncontrolled rectifier composed of six fly-wheel diodes. It is called uncontrolled generation...
Harmonic voltage compensation of the load connected to the point of common coupling (PCC) by using a series of active power filter (SAPF) based on a single phase cascaded multilevel inverter is proposed. The proposed multilevel inverter are presented in detail. The inverter has the ability of acting as a harmonic source when the reference is a non-sinusoidal signal. To achieve this, a simple control...
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...
This paper presents a step by step modeling of a new improved hybrid photovoltaic fed distributed static compensator (PV-DSTATCOM) in a-b-c reference frame. Further the system average model is transformed to orthogonal synchronous (d-q) reference frame. The new improved PV-DSTATCOM is used to compensate the current distortion and reactive power, generated by a non-linear three phase bridge uncontrolled...
In this paper, the details of the implementation of a multilevel dc-link inverter (MLDCLI), suitable for standalone application is presented. The first stage of the MLDCLI is a multilevel dc-link to provide a stepped dc voltage waveform approximating the shape of a rectified sine wave. This rectified sine wave is then inverted after every alternate cycle by a conventional single phase full bridge...
The low voltage power grids usually include neutral wire for load balancing. If currents spectra contain third harmonics then the neutral current can rise to extremely high values. Normal magnitude could be exceeded almost twice. Such kind of overload may lead to reduction of cable lifetime due to insulation aging. The paper goal is to obtain a criterion for choosing compensating devices that based...
This paper presents a 27-Level asymmetric multilevel shunt active power filter topology that allows the compensation of a nonlinear load, as well as the DC voltage regulation thanks to a comprehensive control strategy. The topology considers the ratio 9∶3∶1 in order to generate the AC waveform with a simple staircase modulation algorithm. The dynamic model of the proposed topology is obtained and...
Delivering quality power is the important issue of grid connected solar photovoltaic (PV) system. The generation of quality power from the proposed system is influenced by the intermittent nature of solar photovoltaic power, power electronic converters used and the nonlinear loads connected to the system. To understand and analyze the system an accurate modeling is required. This paper deals with...
This paper discuss control of DVR using SPLL (Software Phased Locked Loop) strategy for compensation of PQ disturbances in power DS (Distribution System) network. Using this control strategy, fundamental reference load voltages are estimated using magnitude of fundamental active and reactive components of source voltages. The SPLL strategy based DVR is modeled in MATLAB R2013b environment using SIMULINK...
This paper deals with the study and simulation of photovoltaic (PV) inverter for stand-alone applications. The system is composed of a PV array feeding RL load through a dc-dc boost converter and three-phase inverter. To assess the system performance, simulations based on hybrid co-simulation approach are performed. At the outset, the PV model is elaborated using Pspice, verified and compared with...
Power electronic converter is known as nonlinear device. Due to its conversion characteristic it drags and draws the source current from the power source. These characteristics make it to generate harmonics that will degrade the grid power quality (PQ). The effects of harmonics include malfunction of connected sensitive equipment such as protective relay and overheating of winding equipment like transformer...
Due to the wide extension of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the alternating currents has became a major concern due to the adverse effects on all equipments. The equipment will develop harmonic pollution source of the system, which generate many disturbances, and interrupt the optimal operation of electrical equipments. These...
This paper proposes a method to calculate the THD% value of the line-to-line voltage waveform at the PCC (Point of Common Coupling) in a shipboard system using an interconnection between Simulink and a power simulator, ETAP. Nowadays, electrical shipboard systems are more and more characterized by AFE (Active Front End) drives that allow more flexibility in the power drive but they can affect the...
The propagation of ripple currents in fuel cells, due to nonlinear loads, is a challenging problem, as it interferes with the electrical performance of the fuel cell. In this paper an electrical system, powered by a modeled Solid Oxide Fuel Cell is used to study the behavior of ripple propagation. In order to remove the harmonics superimposed on the fuel cell current by the propagating ripples, an...
This article presents a study of a design of four controllers to a ladder converter modeled by the generalized equivalent continuous model. Two controllers are designed minimizing the energy of the input and minimizing the states; and the other two controllers are designed minimizing the changes in the input, and the states. Also, the article shows a Kalman filter with shaping noise filter to estimate...
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