研究目的
To address the issues of large leakage current and low efficiency in existing transformerless single-phase grid-connected photovoltaic inverters by proposing a novel topology that effectively suppresses common mode current and reduces system losses.
研究成果
The novel photovoltaic grid-connected inverter topology proposed in this paper effectively suppresses the common mode current by maintaining a constant common mode voltage during the switching period. It avoids the introduction of additional switches, reducing system losses and improving efficiency compared to traditional and other existing topologies. Simulation and experimental results validate the effectiveness and efficiency improvements of the novel topology.
研究不足
The study focuses on a specific novel topology for transformerless single-phase grid-connected photovoltaic inverters. The effectiveness is compared against traditional and some existing topologies, but may not cover all possible configurations or scenarios. The experimental setup is limited to a 3kVA prototype, which may not fully represent all practical applications.
1：Experimental Design and Method Selection:
The study involves the design of a novel transformerless single-phase grid-connected photovoltaic inverter topology with added freewheeling diodes and relocated filter inductors to suppress common mode current. Theoretical models and algorithms are employed to analyze the common mode current and voltage.
2：Sample Selection and Data Sources:
The photovoltaic array is simulated as a power source with specific open circuit voltage and short-circuit current. Simulation models are built in Matlab for the novel topology, traditional full-bridge topology, and H5 and H6 topologies.
3：List of Experimental Equipment and Materials:
Includes a 3kVA experimental prototype based on DSPTMS320F2808, programmable analog dc power TopCon Quadro, and various components like dc bus filter capacitor, filter inductance, and capacitance in ac side.
4：Experimental Procedures and Operational Workflow:
The inverter adopts unipolar modulation with specific driving signals for switches. Four working modes of the novel topology are analyzed to understand the common mode voltage and current suppression.
5：Data Analysis Methods:
Simulation and experimental results are compared to evaluate the effectiveness of the novel topology in suppressing common mode current and improving system efficiency.
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