研究目的
Investigating how the photovoltaic mission profile affects the electro-thermal performance and lifetime of DC-link capacitors in single-stage inverters.
研究成果
The proposed methodology enables a detailed analysis of the electro-thermal performance of DC-link capacitors in single-stage PV inverters, showing how different PV mission profiles affect capacitor lifetime. The study found that the Tropical MP results in a narrower region of capacitor electro-thermal operation and longer estimated lifetime compared to the Temperate MP.
研究不足
The methodology disregards transitory and control dynamics, focusing instead on long-term analysis. It assumes identical capacitors in the DC-link and disregards nonlinearities and mismatches.
1：Experimental Design and Method Selection:
A multi-step methodology was designed to analyze the operating levels of DC-link capacitors in a single-stage full-bridge PV inverter over a full year operation. This includes defining PV mission profiles based on real weather data, mapping operating values of DC-link capacitors, estimating losses and temperature through electro-thermal modeling, and evaluating long-term operation and lifetime.
2：Sample Selection and Data Sources:
Two PV mission profiles in different climate regions (tropical and temperate) were defined using real weather data. A PV model was used to obtain the relevant values of power processing throughout a 1-year operation.
3：List of Experimental Equipment and Materials:
The study involved a single-stage full-bridge PV inverter with DC-link capacitors. Parameters of the PV system, SS inverter, and DC-link capacitors were detailed.
4：Experimental Procedures and Operational Workflow:
The methodology involved simulating the SS inverter in different levels of solar radiance and ambient temperature to build look-up tables for DC-link voltages and currents. Capacitor power losses and temperature were estimated considering the ESR-frequency and ESR-temperature relationships.
5：Data Analysis Methods:
The analysis included calculating the life consumption of DC-link capacitors using the Arrhenius equation and the Palmgren-Miner linear damage accumulation rule to estimate lifetime under different operating conditions.
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