非隔离新型高增益DC-DC升压变换器
2017-10-12董秀成李浩然廖官根
陈 庚,董秀成,李浩然,代 莎,廖官根
(西华大学电气与电子信息学院,成都 610039)
非隔离新型高增益DC-DC升压变换器
陈 庚,董秀成,李浩然,代 莎,廖官根
(西华大学电气与电子信息学院,成都 610039)
针对光伏发电系统中光伏电池板输出电压低,而要求其并网逆变器前端直流母线输入电压高的特点,提出了一种非隔离型高增益DC-DC升压变换器。对其工作原理和性能特点进行了详细的理论分析。并制作了一台输出功率为200 W的实验样机,实验结果表明该变换器具有如下特点:在相同占空比的条件下,变换器具有2倍于传统Boost拓扑结构的电压增益;变换器中两有源开关管的电压应力为传统Boost电路中有源开关管电压应力的一半;变换器中两电感电流一直相等而无需任何均流控制,外加两有源开关管采用同步控制,控制策略简单。
高电压增益;有源网络;同步控制;变换器
Abstract:For PV panel output voltage is low in photovoltaic system,and the requirements to the grid inverter’s front-end DC bus input voltage is high characteristics,a novel non-isolated high-gain DC-DC Boost converter is proposed in this paper.The detailed theoretical analysis about its working principle and performance characteristics have been given.On this basis,a experimental prototype of output power about 200 W is made,and the experimental results show that the converter has the following characteristics,such as,under the condition of the same duty cycle,the converter voltage gain is twice of the conventional Boost topology;the voltage stress of the active switch tube in the converter is the half of the output voltage,that is half of traditional Boost topology’s voltage stress of the active switch tube;the converter’s two inductor currents are equal without any flow control and the two active switch tube have synchronous control all the time,so the control strategy is simple.
Keywords:high voltage gain;active power;synchronous control;converter
随着化石能源的日益枯竭及其燃烧后对环境的污染问题等越来越受到国际社会的关注,寻找新型可再生、无污染的能源迫在眉睫。太阳能发电因其取之不尽用之不竭且清洁无污染等优点,成为了人们对未来能源需求研究的重点课题,潜力巨大。
由于光伏发电系统中光伏板直接输出的直流电压较低,一般为33~43 V,而针对AC 220 V的市电,即使是使用全桥并网逆变器,其直流输入母线电压一般也要380 V,如何实现高增益DC-DC升压是实现光伏并网发电系统中急需解决的问题之一[1-4]。
隔离型DC-DC变换器通过增加拓扑结构中高频变压器的匝数比来提高电压[5-8],但过高的匝数比会影响变换器的线性度。……
