Abstract
Abstract The efficiency of renewable energy electrical collection can be effectively improved by adopting the high voltage direct current (HVDC) electrical collection method. The low-voltage DC power is stepped up to the high-voltage level for HVDC transmission by one-stage step-up type, which can reduce the cost of high-voltage large-capacity DC-DC converters. However, the high cost of DC-DC converters which can achieve high step-up ratio, such as modular multilevel converter (MMC), limits the development of the one-stage step-up type. In this paper, a low-cost DC-DC converter with high step-up ratio which can realize the bidirectional flow of energy is proposed. The total step-up ratio is the product of high-frequency transformer ratio, resonant network gain and step-up ratio of voltage doubler rectifier circuit. Meanwhile, the direct power factor control (DPFC) strategy is proposed based on the idea of controlling active power to achieve the goal of controlling output voltage. Finally, the step-up ratio of the DC-DC converter can reach 160 times, and realize zero-voltage switching (ZVS) turn-on of the switches and zero-current switching (ZCS) turn-off of the diodes.
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