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This paper presents a novel fuzzy logic controller in conjunction with phase locked loop synchronization based shunt Active Power Filter (APF) for harmonics and reactive power compensation in the distribution grid due to the non-linear loads. The Mamdani-type fuzzy logic is adpted and this controller is linguistic description, so it does not require a mathematical calculations. The active power filter...
In this paper, a new compensation strategy for receiving clean power is proposed with a conventional 18-pulse AC/DC rectifier scheme. In the proposed strategy, the compensation currents are injected at the dc side in front of the inter-phase transformer. The injected currents generated by a three-phase current-controlled inverter effectively improve the total harmonic distortion (THD) of the ac main...
The aim of this paper is to discuss new alternatives for three-phase grid connected photovoltaic systems featuring harmonic compensation capability. The conventional and other five different topologies are presented and explained emphasizing the advantages and disadvantages in a scenario where current harmonic compensation is required. The topologies are based in the parallel operation of two grid-connected...
Power electronic converters are commonly used for interfacing distributed generation systems to the electrical power network. This paper deals with a single-phase inverter for distributed generation systems requiring power quality features, such as harmonic and reactive power compensation for grid-connected operation. The idea is to integrate the DG unit functions with shunt active power filter capabilities...
A new shunt active filter is proposed here to reduce the harmonic contents in source voltage and source currents of a harmonic polluted three phase system supplying a non-linear load. The shunt active filter is designed with a eleven level cascaded H-bridge inverter. To generate the required compensation currents multi carrier PWM Currents are extracted from the load power using Synchronous Detection...
A novel method which can improve medium frequency inverter power supply output waveforms using Delta inverter compensate technology is put forward in this paper. Taking parallel compensation as an example, the theoretical analysis of Delta inverter's compensation principle is given. The novel method can improve inverter output waveform distortion which is caused by voltage source inverter's inherent...
In recent years, voltage and current harmonic problems by the remarkable development of static power converters with nonlinear characteristics have been one of the significant subjects. The authors propose the three phase power quality compensator with five leg circuit by indirect power conversion method. This system can compensate the line voltage harmonics by the series inverter and the load current...
This paper proposed a novel dynamic reactive power compensation circuit topology which is applicable to low voltage distribution system. It described the composition, features, and working principle of dynamic reactive power compensation system. Open-loop SPWM control strategy is applied for the inverter, by adjusting the inverter output voltage to dynamically regulate the absorption or emission of...
This paper presents a fault ride through method for use when open circuit winding faults appear on an induction motor drive. A feed forward compensation term is introduced into the zero sequence component of the dq reference voltages which considerably reduces current and torque ripple in the faulted motor drive. If the machine's ldquoneutral pointrdquo voltage can be modulated, then a reasonably...
In distribution power system, the unbalanced operating state, harmonics, negative sequence components, which are caused by the nonlinear or unbalanced loads, not only increase the power transmission losses, but also are harmful to the electric devices. In this situation, the Active Power Filter (APF) and the Static Var Generator (SVG) would be required. However as proved in this paper, the existing...
In this paper, two efficient and reliable neural approaches to control an inverter are developed. The objective is to improve the compensation performance of a conventional active power filter (APF) with a homogeneous neural structure allowing an efficient hardware implementation. The first control approach is based on a neural PI regulator. This technique uses an Adaline to determine the PI parameters...
High-performance sensorless ac drives require the exact knowledge of the motor phase voltages in the whole speed range. The use of voltage sensors may be eschewed if the reference voltage signals, generated by the control algorithm, can be used instead. To this aim, an accurate compensation of most of inverter nonidealities is essential. This paper presents a novel self-commissioning procedure for...
This paper proposes a dynamic voltage restorer for low or medium power applications with a single phase inverter (or STATCOM to acts as a series active filter) structure to compensate the line voltage unbalancing and distortions on the three phase load. The number of required switches of the conventional series three phase circuits is reduced from six to four. A new and simple control routine is applied...
This article investigates the concept of paralleling power inverters for reactive power and harmonic compensation. The investigation focuses on a topology that shares the dc-bus capacitor between two parallel interleaved inverters. The advantages of the proposed approach are: i) decreased current ripple or use of lower switching frequency due to the interleaving, ii) reduced stress in dc-link capacitor...
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