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Reactive power support is expected to be an emerging ancillary requirement for single-phase photovoltaic (PV) inverters. This work assesses related reliability issues as they apply to PV inverters. Three PV inverter topologies are analyzed and their reliability is determined on a component level. Limiting operating points are considered for each of these topologies. Studies show that varying power-factor...
In some photovoltaic applications it is possible to remove the transformer of the system in order to reduce losses, cost and size. In transformerless systems the photovoltaic module parasitic capacitance can introduce leakage currents in which the amplitude depends on the converter topology, on the pulse-width-modulation and on the resonant circuit composed by the system components. In this paper...
Multilevel converters and inverters have become the enabling power conversion technology for high voltage high power applications in today's power systems and large motor drives. Although the neutral-point clamped (NPC, a 3-level) inverter was invented in 1979, the multilevel concept was not formally established until the early 1990s when the diode-clamped multilevel inverter, the capacitor-clamped...
This paper proposes two cascaded multilevel inverter topologies and corresponding control strategies applied to motor drive that interfaces single DC source and ultra-capacitor (UC) energy storage elements. In the first topology, a dynamic control method is developed, which allows the UC to provide reactive power to cancel lower order harmonics through a conditioning inverter both in steady state...
Multilevel inverters have been receiving increasing attention in recent years. Use of multilevel inverters has become popular for motor drive applications. Various topologies and modulation strategies have been investigated in the literature. This paper is devoted to the investigation of a new hybrid multilevel inverter system typically suitable for high-performance high-power applications. In this...
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