基于滑模变结构的交错并联Boost电路均流控制研究

Research on Current Sharing Control of Interleaved Parallel Boost Circuit Based on Sliding Mode Variable Structure

Boost电路常常被用于新能源行业中的升压电路,如光伏发电系统、功率因数校正电路等。交错并联的Boost电路更是因为其散热均匀、器件的电流应力小、体积更小等优势而替代一路Boost被广泛应用。在三路交错并联Boost电路的基础上,采用一个开关周期内三路IGBT的开关信号相差120°的模式实现均流控制。同时,为了对输出电压以及电感电流进行良好控制,提出采用电压外环以及滑模变结构的电流内环控制方法。仿真和实验波形验证了所提方法的有效性。

Boost circuits are often used in new energy industries,such as photovoltaic power generation systems,power factor correction circuits and so on.The staggered parallel Boost circuit is widely used instead of one-way Boost circuit because of its advantages of uniform heat dissipation,small current stress and smaller volume.Based on the three-way interleaved Boost circuit,the current sharing control is realized by using the mode that the switching signals of three-way IGBTs differ by 120°in one switching cycle.At the same time,in order to control the output voltage and inductance current well,the voltage outer loop and sliding mode variable structure current inner loop con-trol method are proposed.Simulation and experimental waveforms verify the effectiveness of the method proposed.