研究目的
To compare the conversion losses and efficiency of three grid-connected converter topologies used in photovoltaic systems.
研究成果
The cascaded boost-inverter topology shows consistent efficiency across varying input powers, while the inverter-transformer topology offers better efficiency at lower power levels but decreases slightly with higher power. The boost inverter topology, despite its lower efficiency, offers advantages in geometric size and the absence of bulky transformers, making it suitable for high MW plants.
研究不足
The accuracy of the loss calculation depends on the accuracy of the device data and the proper scaling of the results from the device test condition to the actual circuit operating conditions.
1：Experimental Design and Method Selection
The research compares three grid-connected converter topologies: boost-inverter, inverter-transformer, and boost inverter structures, focusing on their losses. The simulation uses PSIM software with a thermal module to estimate switching and conduction losses.
2：Sample Selection and Data Sources
The study uses photovoltaic modules as the source for each topology. The control circuits include MPPT features to optimize power absorption from the PV modules.
3：List of Experimental Equipment and Materials
Dual IGBTs Powerex CM600DU-24F, capacitors (6800 uF / 385 V), inductors (26 uH high current type), and a 30 kVA 208/480 transformer.
4：Experimental Procedures and Operational Workflow
The circuit models for each topology are simulated under varying power conditions (10 kW to 25 kW) to observe losses and efficiency. The MPPT algorithm used is perturb and observe (P&O).
5：Data Analysis Methods
Losses are calculated based on the simulation results, focusing on switching and conduction losses in the power switches. Efficiency is compared across the three topologies.
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