Abstract
Grid-tied inverter is the prominent component of the three-phase dual-stage photovoltaic (PV) grid-tied power generation system. However, the disturbances caused by dead time effect will pose the reduction of grid-tied current quality and even cause the imbalance of inverter itself or other circuit devices. In this paper, a current control strategy is proposed to damp dead time effect for the three-phase dual-stage PV grid-tied inverter system, and its design, stability analysis, and implementation are carried out. First, the inverter model is modified by regarding the dq reference frame coupling terms, uncertainties, and external and internal disturbances as an unknown lumped disturbance. Then, a current control scheme based on compensation of equivalent input disturbance is introduced, and it estimates and compensates the unknown lumped disturbance, which effectively realizes the inverter model decoupling and comprehensive disturbance rejection. Last, simulation results demonstrate the effectiveness and superiority of the proposed current controller.
Highlights
As one of the most promising new energy power generation technologies, photovoltaic (PV) power generation has attracted worldwide attention, and it is worth mentioning that China has the highest installed capacity of PV power generation in the world since 2015 (Xiao, 2021)
This paper proposes a new current controller based on compensation of equivalent input disturbance (EID) for the threephase dual-stage PV grid-tied inverter system with considering dead time effect
In an input converter based on the maximum power point (MPP) tracking algorithm and boost circuit, the output voltage of the PV system is modulated to an appropriate value as the input of the inverter and connected to the power grid after filtering circuit and transformer
Summary
As one of the most promising new energy power generation technologies, photovoltaic (PV) power generation has attracted worldwide attention, and it is worth mentioning that China has the highest installed capacity of PV power generation in the world since 2015 (Xiao, 2021). The dead time effect will lead to harmonics in the output voltage of the inverter, especially at low order of fundamental frequency (Chen et al, 2018), and it brings the serious distortion into the output grid-tied current. The ac multi-frequency periodic disturbances caused by dead time effect pose the reduction of inverter output quality (Lai et al, 2021) and even cause the imbalance of inverter itself or other circuit devices. To minimize the total harmonic distortion (THD) level, many current controllers are employed to enhance superior grid-tied current quality, such as proportional multi-resonant controller (Bag et al, 2018; Liu et al, 2013), repetitive controller (RC) (Yang et al, 2016; Li et al, 2020; Xie et al, 2021), and model predictive controller (Hu et al, 2015; Sebaaly et al, 2018). Among them, the tradeoffs between tracking and uncertain disturbance suppression need to be made, due to the single
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