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This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
In a DC-AC system, some problems may threaten the reliability of the whole system, such as the shoot through issue and the failure of reverse recovery. Some methods are proposed to improve the reliability of the converters. The dual buck inverters can solve the above problems without adding dead time but the dual buck topology has a main drawback of low magnetic utilization which increases the volume...
In an inversion system, high reliability is one of the main targets pursuing. Some problems will threaten the reliability of the system, such as the shoot through issue and the failure of reverse recovery. The dual buck inverters can solve the above problems without adding dead time but the low magnetic utilization increases the volume and weight of the system. This paper firstly reviews the traditional...
At present, due to over-exploitation and utilization of non-renewable resources such as fossil fuels, the energy crisis has become a worldwide problem. In this context, the inexhaustible solar received more and more attention. Photovoltaic is one of the main formal uses of solar energy. This paper expounds the advantages of micro-inverter systems and analyzes the design requirements of micro-inverter...
In this paper, an optimization regarding power density and efficiency of 30kVA multilevel Uninterruptible Power Supply (UPS) is presented. The key design parameters, including switching frequency, converter topologies, number of levels, modulation schemes, and passive values, are selected by considering their impacts on losses, harmonics, and Electro Magnetic Interference (EMI). The optimization is...
Stand-alone PV systems are increasingly being used in rural areas to drive basic loads typically less than 300 VA. Such systems are beneficial where grid electricity is unreliable or not present at all. A 250 VA battery integrated stand-alone PV system is proposed here. This PV system is based on simple hardware structure. It is possible to design this system at lower cost with higher reliability...
Aiming at overcoming the problem that the auxiliary switches in an improved auxiliary resonant communicated pole (ARCP) inverter may not realize zero-voltage-switching (ZVS) turning off in practical application if there is parasitic inductance in the wiring process, this paper proposes an active double ARCP inverter topology. In novel topology, the auxiliary capacitor and the auxiliary switch are...
This paper presents a new high power dual IGBT module package designed for megawatt class utility interface inverters operating in the 380VAC to 690VAC range. This new module utilizes the latest high efficiency power chips and features maximum current ratings of 2500A at 1200V or 1800A at 1700V. A new aluminum to aluminum nitride to aluminum direct bonded baseplate structure has been developed to...
The common mode (CM) voltage and current issues due to the parasitic ground capacitance have been well reported for the PWM converters. However, most of the previous work focused on the CM voltage generated at the motor side, or the input/output filter design for the standard compliance purpose. This paper identified a unique ground loop resonance phenomenon for the cascaded H-bridge multilevel inverter,...
This paper presents a new approach for increasing the power capability of standard two level voltage source inverters while increasing the effective PWM frequency by sequential switching of parallel connected inverters. The improved power capability and increased PWM frequency is used for an electrical test bench to test drive inverters under real power conditions. Thereby the parallel connected inverters...
In this paper, the design guideline for a high-power-density inverter for fuel-cell applications is presented. Such an inverter can lead to savings in volume and weight due to high-frequency operation. Also, we present a guideline to determine the optimal size of the input filter. It is also illustrated that, for such a topology, an optimal choice of transformer leakage inductance is necessary to...
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