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The transformerless grid-connected PV system suffers from leakage current and neutral voltage imbalance if three-level inverters are utilized. This paper first investigates the common-mode voltage (CM voltage) reduction/elimination methods in three-phase PV inverters, especially three-level inverters. Several mainstream common-mode voltage reduction/elimination methods, including AZSPWM, 2MV1Z, 3MV,...
An output filter design is presented for high bandwidth high power inverter in this paper. Various filter topologies are compared to eliminate the switching frequency components effectively while generating various output voltage waveforms up to 10 kHz without distortion. This ultimate design consists of an R-C series branch connected in parallel with the C of conventional L-C filter resulting in...
Microinverters mounted on each photovoltaic (PV) panels are gaining popularity due to their benefits such as incremented energy harvest and plug-play operation. This paper proposes a single-stage zeta microinverter for PV applications. The proposed topology is based on a high frequency (HF) transformer isolated zeta converter with a single low side switch on the primary side of transformer. The unique...
The capacitor voltage drift problem in Modular Multilevel Converter (MMC) system has been widely discussed in the past. It is well known that sometimes the capacitor voltages are balanced, without any active controls. However, due to the uncertainty and lack of theoretical explanations, active capacitor voltage controls are typically preferred for real applications, and the voltage balancing/drift...
This paper deals with the performance assessment of different permanent magnet motor drives topologies for Starter/Generator in More Electric Aircraft systems. The comparison is focused on the power electronics part of the system, assuming the possibility to adapt the machine structure to better fit the specific configuration. Simulations performed with Matlab/Simulink and Plexim Plecs will be used...
This paper presents a novel single-stage isolated pulse-width-modulated (PWM) half-bridge cyclo-converter based microinverter for photovoltaic (PV) application. The proposed topology is a single stage microinverter with reduced number of components, and provides high frequency (HF) transformer isolation. This microinverter can be operated both as grid-connected and stand-alone off-grid inverter. The...
For low output voltage application, a half-bridge LLC resonant converter family with synchronous rectifier (SR) that has a boost pulse width modulation (PWM) converter characteristic for hold-up state operation is proposed in this paper. In proposed converters, an auxiliary switch (or an auxiliary switch and a diode) is added at the primary side to provide the charging branch for series resonant inductor...
In a hybrid cascaded multilevel converter subject to different DC-link voltage levels among cascaded cells, should conventional carrier phase-shifting pulse-width modulation be applied, it will fail to multiply the equivalent switching frequency of the overall output voltage. As a consequence, this makes it more difficult to design the output filter and limits the overall output bandwidth. Based on...
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