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In this paper, a cascaded multilevel inverter is implemented for resistive as well as RL load. Working of Cascaded multilevel inverter is studied for various levels of voltages by implementing proper switching. To verify the operation of the proposed inverter, simulation is completed using MATLAB for various levels of outputs such as nine, eleven, fifteen, twenty seven, thirty three and thirty nine...
The proposition for this study is to assess how much simulation results can differ from real measurements on the implementation of a control strategy for a grid-connected PV inverter. The system is simulated in Matlab/Simulink and experimentally evaluated on a real low-voltage distribution grid. The PV inverter is implemented using a power-hardware-in-the-loop platform running the control algorithm...
Next-generation power networks will contain large numbers of grid-connected inverters satisfying a significant fraction of system load. Since each inverter model has a relatively large number of dynamic states, it is impractical to analyze complex system models where the full dynamics of each inverter are retained. To address this challenge, we derive a reduced-order structure-preserving model for...
A novel adaptive battery system with two battery sources is proposed to provide multiple output levels and increased benefits when integrated with multi-level inverters by improving the batteries' state of health (SOH) and state of charge (SOC). Applications of this topology include dynamic hybrid battery/inverter and photovoltaic/inverter systems. The system has been modeled and validated using Matlab...
Harmonic voltage compensation of the load connected to the point of common coupling (PCC) by using a series of active power filter (SAPF) based on a single phase cascaded multilevel inverter is proposed. The proposed multilevel inverter are presented in detail. The inverter has the ability of acting as a harmonic source when the reference is a non-sinusoidal signal. To achieve this, a simple control...
This paper proposes a new wireless power transfer (WPT) control technique, which employs primary side controller and series-series (SS) or series-parallel (SP) compensation to achieve constant voltage (CV) charging or constant current (CC) charging without the information of the variable load. Through the variation of primary side resonant current, the charging voltage or charging current is estimated...
In high power application, Inductive Power Transfer (IPT) system will be limited by high voltage or current stress on switching components. This paper proposes a novel method to increase system power transfer capability without increase voltage and current stress. It's realized by using Dual excitation units at the primary side. This paper compares different resonant topology and presents an optimization...
A topology of series active power filter (SAPF) based on a single phase half-bridge cascaded multilevel inverter is proposed to compensate voltage harmonics of the load connected to the point of common coupling (PCC). The main parts of the inverter are presented in detail. Any voltage reference can be easily obtained by a simple control with the proposed inverter. Therefore, the inverter acts as a...
The concept of transformerless inverters has become a future trend for single phase photovoltaic grid — tied systems. The major factor to be considered while employing transformerless inverters in such applications is the leakage currents. The lack of transformers in inverters, implemented between PV panel and grid results in a galvanic connection and thus there arises problems due to leakage currents...
In this proposed work a basic unit is developed. A single unit can generate two positive and a zero level at the output. As this basic unit can develop positive levels, for negative levels, H-bridge is in addition connected to it. This is advance cascaded H-bridge multi-level inverter. With this it is possible to generate all output levels i.e. positive, zero and negative level. Also in this paper...
This paper proposes the modeling and control of a Solid-State Transformer built using a three stage conversion topology. First, a rectification stage is used, where a three-phase high-voltage AC signal is converted to a DC level; this stage is then followed by a DC-DC converter, and finally an inverter is used to convert the DC into a three-phase low-voltage AC signal. The adopted topology is modeled...
Generating DC and AC voltage from a single DC input, through single stage conversion is cardinal for nanogrid applications. A boost derived hybrid converter is one of the topology used for nanogrid application, which works well in continuous mode of operation rendering both the dc and ac load simultaneously. Despite of this converters successful performance in continuous conduction mode, undesirable...
This paper brings forward a hybrid converter derived from the Split-Pi converter, which can provide simultaneous ac as well as dc outputs from the same dc input. The proposed converter can work both as a step up and step down converter, whereas most of the available hybrid topologies work in step up mode only. The inbuilt property of shoot through protection in inversion stage, makes this converter...
The concept of transformerless inverters has become a future trend for single phase photovoltaic grid — tied systems. The major factor to be considered while employing transformerless inverters in such applications is the leakage currents. The lack of transformers in inverters, implemented between PV panel and grid results in a galvanic connection and thus there arises problems due to leakage currents...
Nowadays, the increase in nonlinear loads has contributed to the generation of harmonics in the source current which in turn causes low power factor and disturbance in the power system. Active power filters (APFs) are known to provide one of the solutions to this harmonic related issue. Various types and configurations of APFs and control have been reported in literature. This paper proposes the integration...
For clean and economical energy, renewable energy resources are widely used for providing electric supply to the consumers. But renewable resources produce dc supply, so multilevel inverters are required for conversion from dc to ac supply as the output voltage generated by multilevel inverters contain less harmonics as compared to conventional two level inverters. In this paper, a new asymmetrical...
Due to the loose coupling characteristic of the wireless power transfer system, design of the compensation topology is important. In SS resonant compensation condition, using Buck circuit in secondary side, the output load current and the duty cycle showing approximate inverse relationship in a wide range, making traditional Buck circuit control method cannot be used. To solve this problem, this paper...
Two parallel ac-ac three-phase to three-phase with shared-leg converters are proposed in this paper. They are composed of two parallel three-phase rectifiers, two parallel three-phase inverters, where each group of rectifier and inverter sharing one or two legs, and one or two dc-links. Suitable modelling and control strategy of the system are developed. Compared to the conventional three-phase to...
In a grid connected photovoltaic system, the main aim is to design an efficient solar inverter with higher efficiency and which also controls the power that the inverter injects into the grid. The effectiveness of the general PV system anticipate on the productivity by which the direct current of the solar module is changed over into alternating current. The fundamental requirement to interface the...
Inverters are used in wide area of interests including household and industries. But in many microgrid applications, industrial applications and aircraft applications, where a renewable energy sources such as photovoltaic, wind, fuel cells etc are used, the classical three level inverters cannot be used due to polluted sinusoidal output. To overcome this difficulty multilevel inverters are used. The...
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