1. Operational reliability assessment of photovoltaic inverters considering voltage/VAR control function.
- Author
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Chai, Qingmian, Zhang, Cuo, Dong, Zhao Yang, and Xu, Yan
- Subjects
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PHOTOVOLTAIC power generation , *INFORMATION modeling - Abstract
• An operational reliability assessment approach of photovoltaic inverters considering voltage/VAR control function is proposed. • An inverter based voltage/VAR control optimization model considering uncertainties of photovoltaic power generation and loads is developed for further inverter reliability assessment. • The power loss model considering the voltage/VAR control results is developed and a modified lifetime model based on coffin-manson model and manufacturing information is proposed to assess the inverter reliability. • In some cases, the implementation of voltage/VAR control function may decrease the junction temperature variations of power devices inside inverters, which leads to positive impact on inverter reliability. • The lifetime of photovoltaic inverters utilized for voltage/VAR control function has high correlation with their locations in the distribution network as well as their oversizing rates. This paper proposes an operational reliability assessment approach of photovoltaic (PV) inverters considering a voltage/VAR control (VVC) function. The approach aims to quantify the reliability degradation and estimate the lifetime of PV inverters when they are utilized for the VVC function. Firstly, an inverter based VVC model considering uncertain profiles of PV power generation and loads is developed and it is solved by a stochastic optimization method. Then, a long-term reliability assessment procedure of the inverters utilized in the VVC model is proposed. To assess the reliability, a power loss model considering the VVC results is developed and a modified lifetime model based on Coffin-Manson model and manufacturing information is proposed. The proposed VVC model and inverter reliability assessment approach are verified on a 33-bus distribution network. The simulation results reveal the long-term impacts of additional utilization in the VVC function on operational reliability and lifetime of PV inverters. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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