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A three-phase symmetrical multipulse modulated (SMM) ac chopper containing six four-quadrant switch (4QSW) realizations is used. Each 4SQW encompasses a power MOSFET. The three 4QSW realizations intended for freewheeling are connected across the load line terminals while the other three are connected in series with the three-phase supply terminals. The source and load currents, and the load voltage...
The major drawback of an inverter are Total Harmonic Distortion (THD) and Harmonics. The study of harmonics and THD are carried out in this work. The cascaded multilevel inverter topology is incorporated to suppress the harmonics produced by the inverter at its output. The cascaded multilevel inverter is most effective with fuel cells or battery stored power. The cells have low voltage ratings, the...
As many industries look to wide bandgap (WBG) devices to replace Si devices in power applications, their effects on the power converter need to be first understood in full. While the benefits of WBG devices are widely known, including high switching frequency operating capability, the special characteristics of these new devices have the potential to cause other issues, in particular electromagnetic...
Distributed Static Compensator (DSTATCOM) is a widely used custom power device in distributed network to perform the power quality improvement tasks like harmonics reduction, power factor correction and maintain reduces constant dc bus voltage. This paper investigates a new topology based on a Distributed Static Compensator (DSTATCOM) coupled with a supercapacitor for power quality enhancement. The...
This paper proposes a new Z-source inverter architecture that does not require filtering at the output side to generate smooth ac voltages. Also, it provides a control strategy based on the concept of Model Predictive Control (MPC) for the proposed inverter. Since each switch of the proposed inverter makes a specific impact on the output of the inverter, MPC is a proper method to control the proposed...
With growing demand for electric power with high power quality and high availability for sensitive loads, a kind of Uninterruptible Power Supplies (UPS) named series-parallel have been introduced. Based on its structure, this topology could show both good power-quality indices-like low input current THD-and high power availability to the load. In fact, this topology utilizes a direct path called Delta...
This paper deals with an enhanced phase locked loop with generalized filtering (GF-EPLL) based control algorithm for a grid interfaced solar photovoltaic (SPV) system. The interface between the SPV array and the grid is realized by a voltage source inverter (VSI). The VSI is implemented for SPV power extraction at high power quality and to feed it into the grid and load connected to it. The IC (Incremental...
A novel multilevel inverter topology with reduced number of power switches is proposed. This new topology is based on a combination of conventional diode clamped and H-bridge topologies. The proposed idea has been validated through simulation results.
In this paper a comprehensive overview of multilevel matrix converter topologies is proposed nowadays as an alternative to the traditional AC/DC/AC multilevel converters. The operation principle and characteristics of the neutral-point clamped and cascaded H-bridge multilevel matrix converters are explained in detail. Simulation results of three-level NPC sparse matrix converter are presented to study...
The following paper proposes a topology for reactive power compensation and harmonic reduction for medium voltage three phase three wire systems during unbalanced load conditions. Main three phase inverter produces harmonic compensation. Three single phase inverters connected in series with the three phase inverter for separate compensation of reactive power in three different phases are present....
This paper presents a control scheme for single-phase grid-connected modular five-level inverter applied to photovoltaic (PV) system. The five-level topology considered consists of two series connected H-bridge cells popularly known as cascaded H-bridge inverter. The reason that it requires an isolated dc sources makes it very attractive and its inherent modularity, easy scalability makes the system...
This paper gives a comprehensive study of the novel 3-phase 4-wire H-bridge interleaved buck active power filter (H-bridge IB-APF) which eliminates current harmonics without shoot-through phenomenon and with no dead time effect. In this topology, three single phase H-bridge interleaved buck inverter is being connected with each particular phase and neutral and can be used for high voltage, medium-to-high...
This paper presents a current sensorless based control algorithm of a DSTATCOM (Distribution Static Compensator) employed in three phase distribution system with a neutral conductor. The control algorithm emulates the load and DSTATCOM collectively as a balanced resistive load for the supply system. This feature allows the algorithm to estimate the current in real time and eliminates the current sensor...
Multilevel inverters (MLI) plays a vital role in high voltage and high power applications due to its capability of converting DC to AC with reduced total harmonics distortion (THD). In this paper, a new multilevel inverter (MLI) with fewer number of control switches is proposed. The proposed topology requires a fewer number of control switches compared to conventional and recently derived topologies,...
This paper evaluates different types of Hybrid multilevel topologies and is compared based on the number of components and output performance. The algorithms for obtaining the dc voltage values are briefed. Comparative analysis elicits the proposed topology for the better reduction of harmonics and reduced number of components such as dc voltage sources and switches in Hybrid multilevel inverter topologies...
Triplers working from 220 GHz to 330 GHz, 330 GHz to 510 GHz using Spin-on-dielectric Temperature Enhanced Reflow Technology are successful designed. Details of the design methodology for the integrated full band triplers on the quartz substrate are discussed.
Electrical energy demands are increasing day by day and application of renewable energy system is going to play major role to fulfill the demands. The microgrid is an electrical power system that incorporates distributed energy resources, distributed storage and local load. The microgrid can operate in shunt with the utility grid or in stand-alone mode. To increase the availability, the microgrids...
In this work, a new SiGe mixer circuit topology operating with the second harmonically pumped mixing technique is proposed. The proposed circuit is developed for to be used in IC receivers which use Zero-IF mixers at their front ends. The Analysis of the circuit is performed and the appropriate operation conditions for second harmonically pumped mixing are investigated. The topology is quite suitable...
A new twelve level three-phase inverter topology based on a computing model that can pre-calculate switching angles is proposed. The main advantage of this topology is that the number of input DC voltage sources, power electronic switches, pre-calculated switching angles, and the total harmonics distortion in the output voltage are all reduced. This means that the topology can be connected to the...
Solid state transformer topologies (SST) have gained great attention because of having features such as reactive power compensation, output voltage regulation and smart grid operation etc. Among SST topologies, three-stage topologies have been mainly focused because there are many appropriate topologies for each conversion stages. However, conventional three-stage topologies may bring complex closed...
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