基于空间矢量滞环控制的新型容错三相四开关并网逆变器

A novel topology of fault-tolerant three-phase four-switch grid-connected inverter based on space vector hysteresis control

三相双降压式并网逆变器是一种性能优良的新型拓扑,在可再生能源发电中具有重要应用价值。为了使三相双降压式并网逆变器在发生故障后能容错运行,提出了新型容错三相四开关并网逆变器并用来做三相双降压式并网逆变器故障重构后的运行拓扑,从而提高系统的可靠性。为了使故障后重构的新型容错三相四开关并网逆变器依然能向电网输送高质量的电能,并获得很好的动态性能和稳态性能,在等效分析的基础上研究了新型容错三相四开关并网逆变器空间矢量滞环控制。仿真结果表明,采用空间矢量滞环控制后的新型三相四开关并网逆变器对输入扰动和电网扰动都具有很好的抑制能力,表现出很好的动态和稳态性能,且输出并网电流波形谐波含量低,波形质量好,能保证故障后的可靠供电。

Three-phase dual-buck-type grid-connected inverter is a new excellent topology and has important application value in the field of renewable power generation. In order to make the three-phase dual-buck-type grid-connected inverter can operate in fault-tolerant mode, a novel fault-tolerant three-phase four-switch grid-connected inverter is proposed as its operation topology after fault reconstruction to improve the system reliability. The space vector hysteresis control of the novel fault-tolerant topology is researched based on the equivalent analysis to make it can transmit high quality electric energy to grid and has good dynamic performance and steady state performance. Simulation results show that the inverter in space vector hysteresis control show good dynamic and static performance, which has very good inhibitory ability for input disturbances and grid voltage disturbance. The grid-connected current output is of high quality and the harmonic content is low. It can guarantee the reliable power supply after the trouble.