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首页> 外文期刊>Emerging and Selected Topics in Power Electronics, IEEE Journal of >PV Single-Phase Grid-Connected Converter: DC-Link Voltage Sensorless Prospective
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PV Single-Phase Grid-Connected Converter: DC-Link Voltage Sensorless Prospective

机译：光伏单相并网转换器：直流链路电压无传感器的前景

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摘要

In this paper, a dc-link voltage sensorless control technique is proposed for single-phase two-stage grid-coupled photovoltaic (PV) converters. Matching conventional control techniques, the proposed scheme assigns the function of PV maximum power point tracking to the chopper stage. However, in the inverter stage, conventional techniques employ two control loops: outer dc-link voltage and inner grid current control loops. Diversely, the proposed technique employs only current control loop and mitigates the voltage control loop, thus eliminating the dc-link high-voltage sensor. Hence, system cost and footprint are reduced, and control complexity is minimized. Furthermore, the removal of the dc-link voltage loop proportional–integral controller enhances system stability and improves its dynamic response during sudden environmental changes. The system simulation is carried out, and an experimental rig is implemented to validate the proposed technique effectiveness. In addition, the proposed technique is compared with the conventional one under varying irradiance conditions at different dc-link voltage levels, illustrating the enhanced capabilities of the proposed technique.
机译：在本文中，提出了一种用于单相两级电网耦合光伏（PV）转换器的dc-link电压无传感器控制技术。与常规控制技术相匹配，提出的方案将光伏最大功率点跟踪功能分配给斩波级。然而，在逆变器阶段，常规技术采用两个控制回路：外部直流母线电压和内部电网电流控制回路。不同地，所提出的技术仅采用电流控制环路并减轻了电压控制环路，从而消除了直流母线高压传感器。因此，减少了系统成本和占地面积，并且控制复杂度最小化。此外，取消直流母线电压环比例-积分控制器可增强系统稳定性，并在环境突然变化时改善其动态响应。进行了系统仿真，并实施了实验装置以验证所提出的技术有效性。另外，将所提出的技术与传统技术在不同的直流链路电压水平下在变化的辐照条件下进行了比较，说明了所提出技术的增强功能。

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