为使电池储能高效安全地参与电网一次调频过程,考虑储能电站内部组成构造,提出一种储能电站各储能单元动态参与一次调频的控制策略.首先在系统频率跃出调频死区时,基于参与因子确定参与一次调频的主辅出力单元,提高荷电状态(State of charge,SOC)保持效果,同时协调虚拟正/负惯性与虚拟下垂3种控制方法依据Logistic函数特性出力,改善一次调频效果;其次当系统频率进入调频死区时,依据超短期负荷预测对储能单元荷电状态进行预恢复,提高储能电站调频容量利用率;最后在两种系统工况下仿真验证,结果表明所提控制策略的有效性.
Primary Frequency Regulation Control Strategy of Energy Storage Power Plant Based on Participation Factor
In order to make battery energy storage participate in grid primary frequency regulation process efficiently and safely,a coordinated control strategy is proposed for each energy storage unit of energy storage plant to participate in primary frequency regulation dynamically considering the internal composition of energy storage plant.Firstly,when the system frequency jumps out of the primary frequency dead zone,the main and auxiliary power units participating in primary primary frequency are determined based on the participation factor to improve the state of charge(SOC) maintenance effect,while the three control methods of virtual positive/negative inertia and virtual sag are coordinated to improve the primary frequency effect based on the characteristics of Logistic function.Secondly,when the system frequency enters the primary frequency dead zone,the load state is pre-recovered based on the ultra-short-term load prediction for the energy storage unit to improve the utilization of the primary frequency capacity of the energy storage plant.Finally,the simulation is verified under two system conditions,and the results show the effectiveness of the proposed control strategy.
Energy storage plantsprimary frequency regulationparticipation factorcharge state pre-recovery
万方数据
维普
