光伏电站中储能系统接入与运行模式

Grid-connected photovoltaic power system with energy storage and operating mode

光伏发电的不稳定性是目前制约其应用发展的主要因素之一。并网光伏电站中增加储能系统是提高光伏系统运行稳定性、补偿负荷波动的一种有效手段,其不仅可以平滑电力输出波动,减小电网峰谷差,而且能提高电力需求管理能力,从而促进光伏发电等可再生能源的应用。选取1 MW并网太阳能光伏实验电站,基于光伏电站出力研究了电力输出的平滑策略;基于储能系统出力和蓄电池荷电状态制定了分时调度控制策略。同时,讨论了光伏电站中不同接入模式下储能系统的运行特性,研究了电网接纳光伏电力过程中储能系统的控制运行模式及其对电网负荷特性的改善作用,提出了储能系统设计的优选方案。

Instability of photovoltaic power generation is one of main factors affecting its applications.Integration of an energy storage system（ESS） into grid-connected photovoltaic power stations not only effectively smooths the power output,but also improves power demand management,leading to the use of more renewable energy.Taking a 1 MW solar PV plant as an example,the smoothing strategy was studied on the basis of the PV plant output and the time-sharing-control scheduling strategy was established by using the output power and the state of charge（SOC） of the ESS.Meanwhile,the operating characteristics of the ESS with different connection modes to photovoltaic power stations and the effect of the ESS on the load characteristics of the PV connected power grid were investigated,and an optimized solution for ESS design was proposed.