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首页> 外文会议>IEEE International Conference on Power Electronics, Drives and Energy Systems >3-level Z-source inverter based PV system with bidirectional buck-boost BESS
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3-level Z-source inverter based PV system with bidirectional buck-boost BESS

机译：基于三级Z源逆变器的光伏系统，具有双向升降压BESS

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摘要

This paper presents a three-level ZSI for photovoltaic (PV) application to achieve single stage buck-boost (as per the solar variation). A single LC impedance network is used between DC voltage source (including PV array and a bidirectional buck-boost system) and neutral-point clamped (NPC) inverter. Alternative phase opposition and disposition (APOD) modulation technique with proper triplen offset and appropriate addition of time delay/advance is used to achieve the required boost in DC link voltage. Traditional MPPT technique (like Perturbed and Observed (P&O)) does not allow boosting the Z-network capacitor voltage more than the maximum power point (MPP) voltage of the PV array. This paper presents a unified voltage control technique to track the MPPT and also maintains the desired Z-source capacitor voltage level. The design, implementation and control of single impedance network based multilevel ZSI for photovoltaic application with BESS according to generation-demand is discussed. This proposed topology not only tracks MPPT output voltage but also maintained constant output voltage with wide range of variation of insulation (irradiance). To validate the proposed scheme the system is extensively simulated in MATLAB/Simulink.
机译：本文提出了一种用于光伏（PV）应用的三级ZSI，以实现单级降压-升压（根据太阳能的变化）。在直流电压源（包括光伏阵列和双向降压-升压系统）和中性点钳位（NPC）逆变器之间使用单个LC阻抗网络。具有适当的三元组偏移和适当的时间延迟/提前量的替代相位相反和配置（APOD）调制技术可用于实现所需的直流母线电压提升。传统的MPPT技术（例如“摄动和观察（P＆O）”）不允许将Z网络电容器的电压升压超过PV阵列的最大功率点（MPP）电压。本文提出了一种统一的电压控制技术来跟踪MPPT，并保持所需的Z源电容器电压电平。根据发电需求，讨论了基于单阻抗网络的基于BESS的多级ZSI光伏应用的设计，实现和控制。该提议的拓扑结构不仅跟踪MPPT输出电压，而且在绝缘（辐照度）变化范围大的情况下保持恒定的输出电压。为了验证所提出的方案，在MATLAB / Simulink中对该系统进行了广泛的仿真。

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