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Integration of multiple power sources using power electronic converters and high-frequency isolation links to supply the sustainable electricity is expected to have a significant impact on the future power system. In this paper, a triple port active bridge converter (TAB) based multi-fed power electronic transformer (TMF-PET) is proposed. The proposed PET consists of three ports having the flexibility...
In this work it is presented a review of the Multilevel Current Source Rectifiers (MCSR), aiming to reduce the number of switches and inductors, thus reducing losses, cost and volume of the converter. Despite the removal of switches and inductors, the control and PWM ensures the correct operating of the converter. Simulations are presented to validate the effective operation of the topology for five-,...
This paper proposes a low voltage ride through (LVRT) control strategy for energy storage systems (ESSs). The LVRT control strategies for wind turbine systems and photovoltaic systems have been researched until now. Regardless of the energy source, the main aim of the LVRT control strategies for a grid side converter is to inject the reactive power according to the gird code regulations. The main...
The Five-Level Active-Neutral-Point-Clamped (5L-ANPC) inverter is one of the most popular topologies among five-level inverters since it combines the features of Flying-Capacitor (FC) type and Neutral-Point-Clamped (NPC) type inverters and was commercially used for industrial applications. This paper proposes a novel modulation strategy for a Six-Switch 5L-ANPC (6S-5L-ANPC) topology to keep voltages...
The transformerless single phase inverters are becoming common due to its advantages of reduced volume, lower cost, and higher efficiency but it has two implementation challenges-high frequency capacitive ground current and decoupling of double line frequency power. This paper proposes an optimized power decoupling topology for a single phase string inverter which addresses both the challenges as...
This paper investigates different compensation methods for neutral point potential deviation based on modular multilevel single star neutral point clamped bridge converter. Theoretical analysis indicates injecting an offset for a cell can effectively decrease this deviation, so this research presents different offset-based compensation techniques, and evaluates their output performance. Besides, this...
This paper presents four single-phase universal active power filters (UAPF) topologies with 4, 5, 6 and 7 legs. The proposed systems are based on AC/AC converters with two transformers. They are suitable to improve the harmonic distortion in the grid currents and a voltage compensation. The filter uses a combination of two series filters and one shunt filter sharing a single DC-link. The proposed...
Cascaded H-Bridge (CHB) inverter is the most widely used topology for Medium Voltage (MV) drive system due to the high degree of modularity, easier implementation of medium output voltage, and ability to continuous operation under the cell fault condition. Because each power cell of CHB should have isolated DC source, multi-winding input transformer and three phase Active Front-End (AFE) are generally...
Power density and efficiency are important metrics for power converters in many applications including renewable energy interface. Combined with the desire to replace the bulky, unreliable electrolytic dc link capacitors with film or ceramic capacitors due to reliability concerns, this has led to the trend of allowing increasingly higher double line frequency dc link voltage ripple. This paper discusses...
As photovoltaic (PV) integration increases in distribution systems, an effective way of assessing the maximum allowable PV integration capacity is urgently needed. In this paper, a new method is proposed to evaluate the maximum PV integration capacity with AC power flow limits, and the effect of topology reconfiguration on PV integration is also considered. In addition, the single commodity flow constraint...
Point-to-point VSC-HVDC Wind power plant (WPP) links connected offshore by AC cables can be called an AC integrated VSC-HVDC scheme or virtual multi-terminal DC (MTDC) grid. Since, the AC integrated VSC-HVDC scheme forms an offshore AC grid, parallel operation of offshore VSC-HVDC converters is required. This paper compares three offshore converter control topologies: (i) feedforward control of AC...
Virtual Synchronous Generator (VSG) can facilitate friendly integration of distributed generations. However, during voltage sags, traditional VSG control cannot provide reactive power support, or limit the peak current. To solve these problems, a general control strategy of VSG under voltage sags is proposed. First, the topology of VSG and its control scheme are described to formulate the key problem...
A novel bridgeless Buck power factor correction (PFC) converter with only half dead zones is proposed in this paper. The operation of the proposed PFC converter can be divided into two different modes including Buck mode in positive line cycles and Cuk mode in negative line cycles. Compared with the bridge or bridgeless Buck PFC converter, only half dead zones occur in this proposed PFC converter...
To minimize power losses in microgrids, we concentrate on reactive power compensation by microgenerators connected to microgrid via electronic interfaces. Comparing exits works, not only the constraint of power balance, but also the bounded capacity of microgenerator is taken into account. We propose a distributed algorithm for the reactive power compensation problem with a fully connected communication...
This paper introduces a single-phase PWM rectifier topology based on a discontinuous conduction mode (DCM) SEPIC converter. The structure integrates two SEPIC rectifiers, which work as half-wave rectifiers, one for each half-line cycle, in a unique converter, and the novel rectifier is designed as voltage-doubler SEPIC rectifier. A comparison with the classic SEPIC rectifier shows that the proposed...
Wireless inductive power transfer technology is becoming very popular in many applications especially in electric vehicles. Until now there are many inductive power transfer topologies are reported based on power electronics, reactive power compensation network and wireless pad. This paper presents detail comparison between parallel L-C and C-C-L compensation network where the DC-AC converter for...
HVDC transmission systems based on voltage source converters have lately emerged as a good alternative to conventional AC transmission. In these transmission systems multilevel converters have become a promising energy conversion technology. The reliability of the power converters are extremely important since a fault in these equipments may lead to an unavailability for a long period of the transmission...
Among the various multilevel converter topologies used in medium and high voltage grid applications, the Modular Multilevel Converter (MMC) has been the most promising since it combines good harmonic performance with low switching frequency and high reliability. A major concern however for inverter designers has been the associated cost due to the need for a large number of power devices and capacitors...
The Reduced Redundant Power Processing (R2P 2) concept was introduced in literature with the aim of improving the overall conversion efficiency of two-stage high-quality rectifiers, capable of providing high power factor and tight output voltage regulation, but it has been applied to DC-DC conversion too. The idea is to have one converter processing only a fraction of the total output power, the remaining...
A modular multilevel converter based solid state transformer (MMC-SST) is proposed in this paper. By adopting the modular multilevel converter as the grid-connected converter at the high voltage (HV) side, the proposed MMC-SST can be applied to the high voltage level, and to comprehensively deal with the power quality problems in the High and medium voltage distribution networks. The topology and...
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