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This paper presents a cascaded H-bridge multilevel inverter that can be implemented using symmetrical topology. A multilevel inverter is a power electronic device built to synthesize a desired AC voltage from several levels of DC voltages. Multi level inverters have been an important development in recent years. Owning the capability to increase the power quality delivered to the load for high performance...
Normally fuel cell based power supply system needs a power conditioner to convert the low DC output voltage generated by the fuel cell into usable AC voltage for any practical application. For proper power conditioning design fuel cell electrical characteristics as well as customer requirements must be taken into account. Therefore, in this paper, a practical design methodology for two-stage power...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
Nowadays high quality power is essential for medical, research and industrial applications to produce good quality results and analysis. In this paper, an attempt has been made to improve the quality of power. A single phase seven level cascaded multi level inverter with identical dc supply is designed to reduce the harmonic components of the output voltage. Genetic algorithm optimization technique...
This paper proposes a new half-bridge inverter based active power quality compensator (APQC) for electrified railways with a three-leg inverter. The first-leg is connected to α-phase, and the second-leg is connected to β-phase. The midpoint of two capacitors on the dc side is connected to the ground line. These two half-bridge inverters exchange the active power on the each feeder each other through...
In this paper, authors propose a six-band hysteresis vector controller based on the seven level packed U cells (PUC) converter to alleviate harmonics contents of stator voltages and currents of the induction machine. Active and passive filters rating can thus be significantly reduced resulting on a high energetic efficiency and a reduced installation cost. The PUC topology was first introduced in...
A novel main circuit topology of voltage quality disturbance generator is proposed in this paper, composed of PWM rectifier and cascade H bridge inverter. The three phase inverter is decoupling controlled. The main advantage of the topology is a hybrid structure, the mainly power of voltage quality disturbance generator is supplied by system source and the small power is supplied by inverter, so the...
A novel main circuit topology of voltage quality disturbance generator is proposed in this paper, mainly consisted by low-frequency cascaded H-bridge and high-frequency H-bridge modules. The topology is a hybrid structure, the mainly fundamental power of voltage quality disturbance generator is supplied by the system source and the small part of fundamental power is supplied by the inverter. The low...
Based on conventional current hysteresis band control, an adaptive hysteresis band control algorithm featuring dynamically modulate hysteresis band width was presented in this paper, and will be used in the application of photovoltaic grid-connected inverter. In the platform environment of Matlab/Simulink, the simulation modules of photovoltaic array, hysteresis band calculator, adaptive hysteresis...
Nowadays, photovoltaic power systems are widely accepted due to the worldwide energy shortage. To attain near sinusoidal outputs of the grid-connected photovoltaic system, improve the power quality, and decrease the energy loss, this work presents a novel photovoltaic grid-connected power conditioner (PVPC) system based on a hybrid multilevel inverter. In the proposed structure, each phase of the...
A novel single-phase voltage sag restorer with diode-clamped multilevel bridge is presented. In the proposed circuit, traditional two-level half bridge inverter is replaced by multilevel diode-clamped inverter, in which the DC-bus voltage is split into several levels by series-connected bulk capacitors. Although the multilevel circuit has more component count than the two-level circuit it is more...
This paper presents the Z - source inverter for adjustable speed drive system. The Z - source inverter employs a unique impedance network couple with inverter main circuit. By controlling the shoot through duty cycle, the Z - source inverter system using MOSFETS provide ride - through capability during voltage sags, reduces line harmonics, improves power factor and high reliability, and extends output...
The paper examines the behaviour of a dynamic voltage restorer (DVR) under balanced/unbalanced supply voltage sag condition, and restricted DVR injection capability (e.g. limited to 50% of the supply voltage injection). Sequence components of the supply voltage are extracted to generate the reference injected voltage for the DVR. The control determines the maximum possible positive sequence injection...
This paper presents a half-bridge single-phase two-wire (1Phi2W) PV inverter system, which can perform both active power filtering (APF) and real power injection (RPI). In the proposed system, it needs only two active switches, reducing cost significantly. In addition, output current of the inverter can be controlled to prevent switches from exceeding their current ratings. Thus, power capacity of...
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