可调度光伏电站中混合储能容量的优化配置

Capacity optimization of hybrid storage in schedulable PV power station

目前的光伏电站多不经调度控制直接并网,但随着光伏发电渗透率的增加,不可控的光伏电站并入电网终将影响电网运行。提出在光伏系统中加入电池和超级电容的混合储能系统,使并网光伏电站可调度,并解决了单一储能方式无法兼顾快速性和持久性的功率需求问题。采用超级电容的电压控制策略,实现了电池和超级电容的功率交换,有效减少了电池的充放电循环次数,提高了电池使用寿命。利用HOMER软件,采用统计学方法,实现了在并网光伏电站可调度下的容量优化配置,使系统总成本最低。通过某地区实例,仿真验证了方法的正确性,并对光照强度和电池寿命进行了敏感性分析。

Most PV stations nowadays were connected to grid without schedule. However,with the expansion of PV penetration, the operation of grid would be finally effected by these uncontrollable PV stations. So battery-supercapacitor hybrid storage scheme in PV station was introduced, which could make the PV station schedulable and satisfy the rapidness and persistence simultaneously. Adopting the supercapacitor（SC） voltage control could enable power exchange between battery and SC, reduce battery recharge cycles and then prolong the battery lifetime. HOMER and statistics method was employed to achieve capacity optimization under schedulable condition, thereby minimize the system cost. An example was chosen to verify this method. At last, sensitive analysis was conducted on radiation and battery lifespan.