一种适用于新能源并网的谐振升压变换器

A Step-Up Resonant Converter for Grid-Connected Renewable Energy Sources

谐振变换器由于可实现开关器件的软开关而十分适用于高压大功率场合。由此提出了一种适用于新能源并网应用场合的谐振升压变换器,该变换器利用LC并联谐振网络可实现很高的电压增益,同时具有开关管零电压开通和近似零电压关断以及整流二极管零电流关断的优点。此外,相比于传统谐振变换器,该变换器在整个负载范围内开关频率变化范围小。阐述了该变换器的工作原理和工作特性,讨论了谐振网络参数的选择,给出了具体的控制电路,并通过一台100V/1k V、1k W的原理样机验证了该变换器的工作原理,最后给出实验结果。

Due to soft-switching for switching devices, resonant converters are suitable for high-power applications. This paper proposes a resonant converter which is suitable for grid-connected renewable energy sources. The converter can achieve high voltage-gain using LC parallel resonant tank. It has the features such as zero-voltage-switching（ZVS） turn-on, nearly ZVS turn-off, and zero-currentswitching（ZCS） turn-off of rectifier diode. In addition, compared with the conventional resonant converter, the switching frequency variation of the proposed resonant converter is smaller over the entire load range. The operation principle of the converter and the selection of the resonant parameters are presented in the paper. A 1k W prototype is built in the lab to verify the effectiveness of the converter.