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This paper focuses on the study of a two-stage, multi-string photovoltaic (PV) system connected by a common DC bus to a centralized inverter, interfaced with a utility grid. The distribution network model, load model and DC bus model are used for simulation. PV system exhibits non-linear v-i characteristics and an intermediate boost converter is employed to operate the PV array at its maximum power...
Predictive current controller is often adopted to compensate time delays caused by digital control. But traditional predictive current control algorithm for four-quadrant converters is an open-loop current observer essentially. Current value predicted is affected by many factors such as grid voltage extrapolation error, inductance error and dead-zone time. All of them will aggravate the grid current...
This paper focus on the most important aspects of the bi-directional DC-DC converter in the hybrid electric vehicle(HEV) for the project applications.The different operating modes of converter are introduced under all HEV's work condition.Based on summarization, the demerits including low efficiency at light load and the uncontrolled discontinuous current when charging for the battery are derivated...
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