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Dispersed small distributed generation (DG) systems in low-voltage (LV) grids pose diverse challenges for successful grid operation. The main one is to guarantee power quality by ensuring that voltages along all the feeders in the network are within the permissible bounds. In addition, voltage regulation by means of reactive power control can be used to achieve side benefits such as power loss minimization...
Large high power electric drives and utility applications necessitate advanced power electronics converter to maintain high and medium power loads with proper modulation system. There are many multilevel inverter topologies familiarizing with as a substitute of high and medium power load. A multilevel inverter should achieve and progress both high power ratings and the better performance with an expected...
Conergy power converter is among single-phase transformer-less topologies that have been proposed to mitigate the leakage current problem in photovoltaic (PV) systems. It is an NPC derived structure, which significantly reduces the leakage current and improves the efficiency. Conergy includes fewer switches compared to other single-phase transformer-less topologies. The reactive power generation capability...
With the goal of deducing the requirement of dc voltage and active power losses, a new topology structure of static synchronous compensator (STATCOM) in order to improve its performance is presented. The new topology changes the property of fundamental-frequency impedance by connecting capacitor in traditional ac branch, and its reactive power compensation theory, parameter selection method and decoupling...
With increasing dominance of renewable energy resources and DC household appliances, the novelty of DC micro grid is attracting significant attention. The key interface between the main supply grid and DC micro grid is AC to DC converter. The conventional AC to DC converter with large output capacitor introduces undesirable power quality problems in the main supply current. It reduces system efficiency...
This paper is concern with the modelling and simulation of three phase front end converter for power quality improvement. The space vector modulation technique is used to control the three phase front end converter. The objective of this work is to get unity power factor at the input side, dc link voltage regulation against load variation and reduction of harmonics in input side line current. The...
A Double integrated buck converter finds application in fields of solid state lighting. buck Converter is widely used for step down dc-dc conversion when there is no isolation requirement. The narrow duty cycle of the buck converter limits its application for high step down applications. The double integrated buck converter overcomes its limitaion. This converter also provides high power factor and...
A virtual synchronous generator (VSG) control for high power permanent magnetic synchronous generators (PMSG) in wind power generation is investigated in this paper. A power factor correction (PFC) rectifier for each phase of the PMSG is designed to transform variable voltage and frequency of wind power into constant voltage DC power. The PFC boost inductor is replaced by a PMSG armature inductance...
This paper presents a novel topology for instantaneous reactive power compensation. The topology is derived from Dynamic-Current or Dyna-C, which is a patented power converter capable of transferring energy for two- or multi-terminal DC, single- and/or multi-phase AC systems. The proposed topology has a modularized low-voltage current source building block that can be stacked for medium-voltage (MV)...
There is a need to improve the power quality of the grid as well as the power factor implied on the grid due to the nonlinear loads connected to it. A new single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed in this research. By eliminating the input bridge in conventional PFC...
The design and simulation of bridgeless modified Single Ended Primary Inductance Converter (SEPIC) is presented in this paper. This converter is designed by introducing the voltage multiplier technique to the conventional SEPIC converter which provides high static gain, low conduction losses and low switching stresses. This converter combines the operation of diode bridge rectifier and modified SEPIC...
Most of the AC-DC systems include an AC DC converter for power factor correction followed by an isolated DC-DC converter. AC-DC converters will introduce harmonics to the input current waveform as it contains nonlinear elements, so a suitable control technique is required to smoothen the input current to reduce harmonics. For high power applications, Bridgeless interleaved (BLIL) AC-DC converter is...
This paper proposes a 1 MW grid-tie photovoltaic system by connecting quasi-Z-Source (qZS) networks into Cascaded H-Bridge (CHB) inverter. The proposed Power Conditioning System (PCS) consists of a 3-phase 48-cell CHB inverter where each module is fed by a qZS network. The proposed topology allows boosting the input voltage to a higher level while solving the traditional imbalance problem of DC-link...
In this paper, a finite control set Model Predictive Control (MPC) for grid-tie quasi-Z-Source (qZS) based multilevel inverter is proposed. The proposed Power Conditioning System (PCS) consists of a single-phase 2-cell Cascaded H-Bridge (CHB) inverter where each module is fed by a qZS network. The aim of the proposed control technique is to achieve grid-tie current injection, low Total Harmonic Distortion...
The five-level active-neutral-point-clamped (ANPC) converters are newly hybrid topologies which have the advantages of traditional neutral-point-clamped (NPC) and flying-capacitor (FC) multilevel converters. A novel seven-switch five-level ANPC (7S-5L-ANPC) inverter topology is proposed, which reduces the number of active semiconductor switches over traditional 5L-ANPC inverter topologies. It is capable...
Multilevel converters are a popular solution for medium-voltage and high-power applications, including renewable energy conversion. Five-level active neutral-point-clamped converter (5L-ANPC) is one of the most advantageous topologies among five-level multilevel converters. A six-switch 5L-ANPC (6S-5L-ANPC) topology is proposed, which can achieve low-cost because several fast recovery diodes are employed...
Advances in power electronics are enabling More Electric Aircrafts (MEAs) to replace pneumatic systems with electrical systems. Active power factor correction (PFC) rectifiers are used in MEAs to rectify the output voltage of the three-phase AC-DC boost converter, while maintaining a unity input power factor. Many existing control strategies implement PI compensators, with slow response times, in...
In grid connected mode of distributed generation applications, the elimination of line frequency transformer is possible without impacting system characteristics related to grid integration, ground leakage current, dc injection, safety issues etc. This paper presents the design, modeling, simulation and implementation of closed loop operation of a novel inverter topology suitable for transformer-less...
A new single-stage-single-switch (S4) transformer less converter that integrates a buck-type power-factor correction cell and also buck type dc-dc output cell for stepping down voltage in a special way is presented in this paper. This new topology preserves the advantages of presently available transformer-less S4 converters, like voltage stress is low across the dc link capacitor, current stress...
This paper presents the simulation of the steadystate analysis and design Eqs. of high power factor three-phase AC to DC current injection hybrid resonant converter. The series-parallel (hybrid) resonant converter using current injection technique is the key concept of this paper, which is realized by injecting the high-frequency resonant current to the diode-bridge rectifier. Featuring a high power...
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