研究目的
Investigating the impact of battery operation on the PV inverter reliability in a residential PV-BESS system under a self-consumption scheme.
研究成果
The integration of battery systems in PV applications can improve PV inverter reliability by reducing loading during battery charging. The study shows an 11% reduction in accumulated damage over one year of operation. Battery capacity and converter power rating significantly affect PV inverter reliability, with larger battery capacities and smaller converter power ratings offering further improvements. However, these parameters should be optimized considering other design aspects to maximize the overall benefit of the battery system in PV applications.
研究不足
The study focuses on the reliability of PV inverters in a specific configuration (DC-coupled PV-BESS) and under a self-consumption scheme. The analysis is based on mission profiles from a single location (Lindenberg, Germany), which may not represent all operational conditions. The impact of battery system parameters is analyzed, but other design aspects like cost and battery lifetime are not fully integrated into the optimization.
1：Experimental Design and Method Selection:
The study evaluates the reliability of PV inverters in a 6-kW residential PV-BESS system in Germany, focusing on the impact of battery operation under a self-consumption scheme. The methodology includes mission profile-based reliability assessment, considering solar irradiance, ambient temperature, and load profiles.
2：Sample Selection and Data Sources:
A one-year mission profile from Lindenberg, Germany, with solar irradiance and ambient temperature data, and a household load profile based on measurements from 32 residential households.
3：List of Experimental Equipment and Materials:
A 6-kW PV system with integrated battery storage, including PV arrays, battery systems, PV inverter, and battery converter. Specific parameters include a battery capacity of 7.5 kWh, battery converter rated power of 3 kW, and PV inverter rated power of 6 kW.
4：5 kWh, battery converter rated power of 3 kW, and PV inverter rated power of 6 kW.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The study involves calculating PV array output power from mission profiles, determining PV inverter loading considering battery operation, and assessing the thermal loading and damage of power devices using loss and thermal models.
5：Data Analysis Methods:
The damage to power devices is calculated using a lifetime model of IGBT modules, considering thermal stress metrics such as cycle amplitude, mean junction temperature, and cycle period. The accumulated damage is assessed using Miner’s rule.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
