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A high step-up-ratio DC/DC converter for photovoltaic energy integrated into high voltage DC grids is proposed in this paper. The converter is mainly composed of modular DC/DC conversion modules which are configured as input-parallel-output-series structure. The proposed module is consisted of two power stages, with a boost circuit as the first stage and a narrow-switching-frequency-variation LLC...
Large-scale photovoltaic(PV) generation system connected to HVDC grid has many advantages compared to its counterpart of AC grid. DC connection can solve many problems that AC connection faces, such as the grid-connection and power transmission, and DC connection is the tendency. DC/DC converter as the most important device in the system, which has become one of the hot spots recently. There are many...
In this paper, an optoelectronic isolation device is designed to protect the measurement system of underwater discharge acoustic source (UDAS), from the harmful HV-GND drift. In this device, one linear optocoupler HCNR200 and four high speed operation amplifiers are used to perform a symmetric ‘electronic-optic-electronic’ conversion, and a method of setting a biased voltage is used to avoid the problem...
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