Investigation on pulse-width amplitude modulation-based single-phase quasi-Z-source photovoltaic inverter
Investigation on pulse-width amplitude modulation-based single-phase quasi-Z-source photovoltaic inverter
复制标题
DOI：
10.1049/iet-pel.2016.0593
复制
发表时间：
2017-07
影响因子：
2
通讯作者：
Weihua Liang;Yushan Liu;B. Ge;H. Abu-Rub
中科院分区：
文献类型：
--
作者：
Weihua Liang;Yushan Liu;B. Ge;H. Abu-Rub
针对基于单相准 Z 源逆变器 (qZSI) 的光伏 (PV) 电力系统提出了脉宽幅度调制 (PWAM) 方法，以降低准 Z 源 (qZS) 阻抗值，同时提高效率。该方法通过结合脉冲幅度调制 (PAM) 和变化的直流母线电压包络来改进 qZSI 的正弦脉宽调制 (SPWM)。 SPWM 在低直流母线电压下工作，降低电压应力并避免直通切换。 PAM 在不同的直流母线电压下工作，减少了开关事件的数量。因此，与在恒定直流母线电压下工作相比，功耗降低了。本研究进一步研究了基于 PWAM 的单相 qZS 光伏逆变器系统。针对其并网和独立运行，提出了一种带有控制策略的改进拓扑。详细介绍了阻抗参数的设计方法。讨论了使用 SPWM 和 PWAM 的单相 qZSI 时的升压和降压操作性能。仿真和实验结果验证了单相 qZSI 的 PWAM 的突出特性，以及所提出的基于 PWAM 的单相 qZS 光伏发电系统双模式运行的方法。
The pulse-width amplitude modulation (PWAM) method was proposed for the single-phase quasi-Z-source inverter (qZSI)-based photovoltaic (PV) power system to reduce quasi-Z-source (qZS) impedance values while improving efficiency. The method modified sinusoidal pulse-width modulation (SPWM) of the qZSI by combining pulse-amplitude modulation (PAM) and a varied dc-link voltage envelope was produced. The SPWM worked at low dc-link voltage, lowering voltage stress and avoiding shoot-through switching. The PAM worked at the varied dc-link voltage, reducing the number of switching events. As a result, the power dissipation decreased compared to working at the constant dc-link voltage. This study further investigates the PWAM-based single-phase qZS PV inverter system. An improved topology with control strategy is proposed for its grid-connected and standalone operation. Design method of impedance parameters is detailed. The performance in boost and buck operation is discussed when the single-phase qZSI using SPWM and PWAM. Simulation and experimental results verify outstanding features of the PWAM for single-phase qZSI, and the proposed approach for dual-mode operation of the PWAM-based single-phase qZS PV power system.