基于滞环电流控制的串联型双Buck逆变器

摘要

为了使分布式发电系统更有效更稳定地利用自然资源,文章提出了一种适用于风光发电系统（WPGS）的逆变器模型,它由两个双Buck结构串联组成。通过理论分析和模型仿真研究了该逆变器的工作过程。系统由电压外环和电流内环调节输出电压和输出功率,滞环电流控制消除了斜坡交截SPWM控制所需的的偏置电流,提高了效率,增强了系统稳定性。仿真结果表明该逆变器具有克服桥臂直通的优点,可以在两输入电压不稳的情况下为负载提供稳定的电压,具有一定的实用价值。%In order to make use of natural resources efficiently in the distributed generation system, an inverter model consisted of two series dual Buck and suitable for Wind / PV Generation System （WPGS） was proposed. Its working process was theoretically analyzed and simulation. The output voltage and power were regulated respectively by outer volt age loop and inner current loop. The hysteresis current control method eliminated bias current which was needed in the ramp SPWM control, thus the efficiency raised, and the system became more stable. Finally, simulation results showed that the proposed inverter has the advantage of overcoming bridge shoot-through, and can provide a stable voltage in the case of two input voltage instability load, so it has certain practical value.