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[IEEE 2019 IEEE Industry Applications Society Annual Meeting - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Industry Applications Society Annual Meeting - A New Magnetic Linked Active Neutral Point Clamp Converter for Transformer-less Direct Grid Integration of Solar Photovoltaic Systems
摘要： The multilevel inverters are becoming increasingly popular for use in the grid integration of wind and photovoltaic (PV) power plants due to their higher voltage handling capability and the better output power quality. There are several types of multilevel inverters that have been proposed in the literature; among them the active neutral point clamp (ANPC) multilevel inverters have been drawing significant attention specially for reducing unequal loss distribution. However, with the increase of number of levels, the ANPC requires more electronic switches and flying capacitors, by which the complexity and the cost increases. In this paper, a reduced number of switch and flying capacitor ANPC inverter is presented for the grid integration of the solar PV systems. Moreover, the proposed power converter effectively utilizes the dc bus voltage compared with the traditional ANPC converter. In the proposed inverter, a high frequency transformer is used to eliminate the voltage balancing problems faced by the traditional ANPC inverters. The proposed magnetic linked power converter provides the galvanic isolation, which is one of the most critical issues for traditional transformer-less grid connected PV systems. The proposed topology makes the control strategy simple and makes the power conversion system reliable for the photovoltaic power plants.
关键词： grid integration,inverter,ANPC,loss distribution,solar photovoltaic
更新于2025-09-11 14:15:04
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Common Mode Noise Reduction of 3-level Active Neutral Point Clamped Inverters with Uncertain Parasitic Capacitance of Photovoltaic Panels
摘要： SiC devices can upgrade the inverter performance to a new level by its potentially more than 10 times higher switching speed compared to its Si counterpart. Whereas, the high switching frequency and dv/dt, di/dt worsen the electromagnetic interference (EMI). Reduction of the common mode (CM) noise of the non-isolated photovoltaic (PV) inverters are addressed by many researchers through adding filters or balancing the circuit. However, most methods rely on the certainty of the parasitics in the system in advance. It is usually not practical for a PV inverter because the parasitic capacitance of PV panels that are to be installed in plants varies from case to case and further can be seriously affected by the damp environment. This paper proposes a practical way to reduce the CM noise of the 3-level (3L) active neutral point clamped (ANPC) inverters with uncertain parasitic capacitance of PV panels. Firstly, the CM model of ANPC inverters with all parasitic capacitances is established. Next, most existing hardware-based reduction methods of the CM noise are summarized based on a unified mathematical model and further compared with each other. After the comparison, a practical method is proposed to reduce the CM noise of the ANPC inverter with uncertain parasitic capacitances, which just adds little volume and cost to the whole system. Finally, the simulation and experiments are conducted to validate the proposed method.
关键词： EMI elimination,common mode (CM),active neutral point clamped (ANPC) topology,electromagnetic interference (EMI),Uncertain parasitic capacitance
更新于2025-09-11 14:15:04