一种应用于光伏系统的单级升压式无变压器型逆变器  

A single stage step up transformerless inverter for photovoltaic system

作　　者：张银娟[1] 王永科 Zhang Yinjuani;Wang Yongke(Xuchang University,Xuchang 46i000,China;Xuchang Electrical Vocational College,Xuchang 46i000,China)

机构地区：[1]许昌学院,河南许昌461000 [2]许昌电气职业学院,河南许昌461000

出　　处：《可再生能源》2022年第1期122-127,共6页Renewable Energy Resources

基　　金：河南省高等职业学校青年骨干教师培养计划(2019GZGG109);许昌学院横向科研项目(2021HX138);国家级大学生创新创业训练计划项目(202110480013)。

摘　　要：文章提出了一种应用于光伏发电的新型升压式无变压器逆变器拓扑结构。该拓扑结构使用双载波同相层叠调制技术,可实现电压的高增益,仅使用较低占空比即可将低压直流侧电压并网。该拓扑输入负极与电网中性点共地,可将分布的杂散电容短路,完成无共模电流运行。同时,所提拓扑结构通过多单元整合实现了能量的单级传递,仅含6个功率开关管。文章详细分析了所提拓扑各功率元件的设计及主要工作模式。最后,通过一台120 W的试验样机,验证了所提拓扑的正确性和控制策略的有效性。A novel boost transformerless inverter topology for photovoltaic power generation is proposed. In short, the topology uses dual carrier in-phase cascade modulation technology, which can achieve high voltage gain, so the low-voltage DC side voltage can be connected to the grid only with low duty cycle. The input negative pole of the topology is grounded together with the neutral point of the power grid, so as to short circuit the stray capacitance distributed in the circuit and complete the operation without common mode current. At the same time, the proposed topology achieves single-stage energy transfer through multi cell integration. Finally, a 120 W prototype is built to verify the correctness of the proposed topology and the effectiveness of the control strategy.

关 键 词：共模电流 光伏发电 逆变器 高增益 

分 类 号：TK51[动力工程及工程热物理—热能工程] TM464[电气工程—电器]