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Traditional 2-level voltage source inverter (VSI) based active power filters (APF) has a high DC voltage across the capacitor. A pure APF connected to a 3-ϕ 400V line voltage, will have a DC voltage of more than 600V for its effective working. Active switches in the inverter subjected to this voltage, results in a high voltage stress. Multi-level inverter topology in APF reduces the voltage stress...
Variable speed drives system are known to bear Common Mode Voltage which causes shaft voltage, bearing currents and EMI problems. In this paper a new topology to realize multilevel operation for a 3-φ, dual inverter fed open ended winding induction motor with Common Mode Voltage (CMV) elimination is presented. The proposed dual-inverter configuration makes it easy to facilitate all the space vector...
In this paper, the topology of distribution static compensator (DSTATCOM) with a three-phase four-wire system is modified. The modification concerns with the interfacing filter and DC-link capacitor with a goal of improving the system power factor, stabilizing the system voltages and eliminating the harmonic distortion resulting from nonlinear loads. The modified DSTATCOM has a three-leg inverter...
A modified multilevel inverter (MLI) structure has been presented for Photovoltaic (PV) fed 2.3 kV micro-grid applications. To feed the cascaded multilevel micro-grid connected inverter (CM-MGCI) voltage, a PV array is designed considering the environmental effects of Bangladesh. We have estimated the performance of the classical and a modified cascaded H-bridge (CHB) MLI with level-shifted carrier...
Multi-modular active power filter has advantages in compensating harmonic current, which results from its controllability and dynamic response performance. However, to realize a reliable and high-precision harmonic compensation system, current control and dynamic coordination strategy need to be optimized. In this paper, centralized current loop is optimized with amplitude and phase correction based...
Space-vector pulse-width modulation (SVPWM) computations are complex particularly for multilevel converters. This paper introduces a novel SVPWM computation method for multilevel converters. General formulas for the region identification as well as for PWM intervals calculation are proposed. Then, the proposed formulas are applied to the advanced dual three-level T-type converter topology. The operation...
A second harmonic mixer appropriate for direct conversion recievers is realized in 0.18 μm SiGe technology. The realized topology offers a unique mechanism to prevent LO to RF leakage, thus, suppress the DC Offset voltage due to LO self mixing. The constant current consumption of the topology provides a proper isolation of the noise mixing operation from the supply lines. Large signal analysis of...
In this paper, a new single-phase asymmetrical multilevel inverter topology is proposed. The topology is capable of producing n-level output voltage with reduced device counts. It is achieved by arranging available switches and dc sources to obtain maximum combinations of addition and subtraction of the input dc sources. To verify the viability of the proposed topology, circuit models for nine-level,...
This paper introduces a unique seven level five switch Inverter with different type of filters to reduce total harmonic distortion (THD) and suitable for renewable energy applications. In conventional inverters output voltage and current waveforms are very far from the sinusoidal shape due to high percentage of THD. This type of distorted output voltage is not suitable for industrial drives and renewable...
This paper proposes a new approach to calculate optimal firing angles of a Seven-Level Cascaded H-bridge Multilevel Inverter(CHB-MLI) using Gravitational Search Algorithm(GSA). The presence of more levels in the output voltage waveform of MLI introduces large harmonic content which should be reduced. Selective Harmonic Elimination(SHE) method is the popular technique used for eliminating the desired...
In recent years, the majority of the research has focused on grid-tied transformerless PV inverters, more capable than traditional grid-tied line transformer-based PV inverters, but more critical from a power quality point of view, especially in terms of common mode voltage and ground leakage current. Neutral point clamped (NPC) converters have recently gained popularity due to high efficiency and...
This paper deal with an improved adaptive detection (IAD) control approach for a grid tied solar photovoltaic (SPV) system. The SPV grid interfaced systems are facing several power quality issues due to extensive use of nonlinear and reactive loads. To eliminate these problems, an IAD based control approach for the proposed system is implemented for the mitigation of harmonics, reactive power and...
This paper introduces a hybrid topology for multilevel inverter that operates in asymmetric manner. The proposed topology is generalized using series connection of basic module. It offers less number of switches and isolated dc voltage sources as compared to conventional and recent proposed topologies. Carrier based level shift sinusoidal pulse width modulation scheme is adopted for generating switching...
in this paper, a simple and low cost single phase seven-level inverter for PV solar pumping system is proposed. The system consists of a dc-dc multilevel boost converter which is utilized for generating three voltages at its output terminal. In addition a dc-ac multilevel converter apt for the engendered dc bus voltages generates seven levels at its output terminal. The proposed system has the advantages...
This paper presents the simulation of a Three Phase Five Level Cascaded H-bridge Multilevel Inverter. Third Harmonics Injection Pulse Width Modulation (THIPWM) technique was employed through s-function approach in SIMULINK environment to minimize the complexity of circuit design. The advantages of THIPWM are revealed in term of voltage and current THD reduction compared to Sinusoidal Pulse Width Modulation...
Battery energy storage systems (BESS) are expected to increase in the number and capacity because of the increasing share of intermittent renewable energy resources in the electrical grid. Due to the cost and nature of the BESS, they are well suited for the primary reserve to balance load fluctuations in the grid. Power-electronic converters are employed for the power exchange between the transmission...
In this paper, we propose a dense approach for 3D rotation estimation between spherical images, which is simultaneously able to recover the large rotations, robust under clutter and small translations. The key idea is to represent the spherical images by 3D shapes of the triangular mesh surfaces based on image intensity signal. This allows to apply the spherical harmonics representation as 3D shape...
This paper proposes a novel design concept for variable reluctance permanent magnet machines (VRPMMs) by introducing heteropolar dual stators and shifted rotors in axial direction. The machine is geometrically similar to switched reluctance machines, but with homopolar PMs alternately mounted on stator poles. With this design concept, the bipolar and sinusoidal coil flux-linkage can be obtained due...
Several power converter topologies have been presented for Inductive Power Transfer (IPT) systems to generate high frequency current to cite the primary side inductive coils/tracks. This paper proposed the neutral point clamped (NPC) and flying capacitor (FC) multilevel converters based IPT systems which are suitable for high power IPT applications. The modulation strategies for single phase as well...
This paper presents a research on reducing the torque ripple in a brushless wound rotor synchronous machine (BL-WRSM). The rotor of the machine has been optimized using genetic algorithm (GA) and Kriging method, considering the torque ripple reduction. Finite Element Analysis (FEA) is performed with the optimized design and improved results were obtained.
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