Abstract
The reliable operation of photovoltaic (PV) power generation systems is related to the security and stability of the power grid and is the focus of current research. At present, the reliability evaluation of PV power generation systems is mostly calculated by applying the standard failure rate of each component, ignoring the impact of thermal environment changes on the failure rate. This paper will use the fault tree theory to establish the reliability assessment method of PV power plants, model the PV power plants working in the variable environment through the hardware-in-the-loop simulation system, and analyze the influence of the thermal characteristics of the inverter’s key components on the reliability of the PV power plant. Studies have shown that the overall reliability of bus capacitors, inverters, and PV power plants is reduced by 18.4%, 30%, and 18.7%, respectively, compared to when the thermal characteristics of bus capacitors are not considered. It can be seen that thermal attenuation has a great influence on the reliability of the PV power generation system.
Highlights
PV power generation is considered the most promising method to replace traditional energy in the future
According to the forecast of the International Energy Agency (IEA), it will further increase to 4670 GW by 2050, when PV power generation will account for 11% of the total power generation [2]
Compared with the case without considering the thermal characteristics of the bus capacitor, its reliability is reduced by 18.4%
Summary
PV power generation is considered the most promising method to replace traditional energy in the future. The constantly changing environmental conditions such as ambient temperature, wind speed, and irradiance, along with the fact that the types of devices used in the system are different, lead to great challenges in the design, operation, and maintenance of PV power generation systems For this reason, the reliability of each component of the PV system needs to be fully considered to reduce the probability of failure and improve the reliability of the system [3,4,5,6,7,8,9,10,11,12]. This research first determines the key components of inverter failure based on the reliability evaluation method of the fault tree model, and models the PV power plant through the hardware-in-the-loop simulation system, imports the light and temperature parameters of the PV system, and obtains the changed working environment parameter. Based on the above relationship, the system reliability of the grid-connected PV power plant can be evaluated
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