摘要
新型直流侧级联的光伏逆变系统拓扑结构由多路单相全桥变换器与其连接的直流侧电容组成,直流侧电容串联能减少逆变桥电压。该拓扑结构使得MOSFET这种开关器件得到更广泛的应用。使用该拓扑结构可减小主电路的电流,同时由于使用了MOSFET,电路中的开关损耗减少了很多,因此降低了线路损耗。更为重要的是,通过对级联逆变器使用载波移相SPWM方式,降低了系统的工作频率,从而直接有效地降低了开关器件的损耗。最终通过仿真验证了该拓扑结构的有效性,研究结果表明多路直流侧级联光伏逆变系统具有较优越的谐波抑制能力,其直流电压控制简单。
The use of the new cascaded DC link based inverter for solar power system consists of multiple single phase full-bridge converters connected through voltage divider capacitors network on DC side to reduce the voltage stress of the bridges to the least.This allows the MOSFETs kinds devices widely used.Hence the topology can largely reduce the line losses and device losses for the reduce of the main current and the use of MOSFETs.What＇s more,the switching frequency can be further decreased by using the phase-shift modulation SPWM which directly influences the losses of the switching devices.Finally the simulation confirms the effectiveness of the new topology.The result shows that the multi-branch DC link based inverter has superior harmonic suppression and the simplification of the DC link control.
出处
《电力电子技术》
CSCD
北大核心
2012年第3期43-45,共3页
Power Electronics
关键词
光伏逆变器
级联
移相
photovoltaic inverter
multi-branch
phase-shift
