基于Z源逆变器的两种控制策略对比研究

摘要

文章对Z源逆变器的工作原理进行了分析，验证了Z源逆变器的升降压能力。对传统电压源型逆变器和电流源型逆变器与Z源逆变器的性能进行了对比，最终验证了Z源逆变器的整体性能优于传统逆变器。通过分析对比恒定直通占空比和最大化直通占空比两种PWM控制策略，得到两种控制策略下的最大直通占空比的大小，以及开关管最大电压应力的大小，为不同场合的不同控制策略控制提供了依据。%Z-source inverter working principle has been analyzed,thus the Z-source inverter buck capability has been verified. The performances of traditional voltage source inverters and current source inverter and Z-source in-verter have been compared,then the overall performance of Z-source inverter was verified to be superior to tradi-tional inverters. By analyzing and comparing the constant duty cycle and the maximum straight pass-through of two PWM duty cycle control strategies,two control strategies have been used to get the size of the maximum duty cycle straight through,as well as the maximum switch voltage stress magnitude,which provided the basis for the control of different control strategies under different occasions.