考虑储能状态转移模型的光伏电站可靠性评估方法

The Reliability Evaluation Method of Photovoltaic Power Station considering the State Transfer Model of Energy Storage

光伏电站作为一种的可再生能源消纳形式,其发展能够有效地改善环境质量,缓解能源危机。由于光伏出力具有显著的波动性,因此,有必要增加储能设备,以提高光伏电站的可靠性。本文提出一种基于改进马尔科夫链的光伏电站储能模型,并进一步推导光伏电站供电可靠性与储能系统容量的关系。经改进的马尔科夫链可基于期望的供电可靠性指标,规划出合适的储能系统容量。本文采用某锂电池作为示例,以评估储能容量退化以及不同的充、放电效率对系统供电可靠性的影响。

As a typical form of renewable energy consumption,the development of photovoltaic power station can effectively improve the environmental quality and alleviate the energy crisis.Due to the significant fluctuation of photovoltaic output,it is necessary to add energy storage equipment to improve the reliability of photovoltaic power station.This paper proposes an energy storage system model based on an improved Markov chain,and further derives the relationship between the power supply reliability of a PV generation plants and the capacity of the energy storage system capacity.The improved Markov chain can plan a suitable energy storage system capacity based on the expected power supply reliability indicators.The lithium battery is taken as an example to evaluate the degradation of energy storage capacity,and the impact of different charging and discharging efficiencies on system power supply reliability.