摘要
针对光储独立微网中直流母线电压易受光伏发电功率及负载用电功率的波动影响,通过类推V-I下垂控制提出一种功率-电流(P-I)控制策略,用控制系数k来改变与光伏发电输出功率的数学关系,以实现微网的功率平衡,可有效抑制微网直流母线电压的波动。通过建立光伏电池及蓄电池数学模型,分析PV发电输出功率与负荷功率的关系,推导出系数k与光照强度及储能充放电电流之间的关系式,设计了一种P-I控制器。Simulink仿真结果表明,该P-I控制方法能有效地协调控制直流母线功率平衡,有效地提高系统的稳定性。
Since the DC bus voltage in optical storage independent micro-grid is easily influenced by the fluctuation of pho- tovohaic power generation＇s power and load electrical power, a P-I control strategy is proposed on the basis of the analogy of the V-I droop control. The control coefficient k is used to change the mathematic relation with output power of PV power genera- tion to realize the power balance of the micro-grid, and suppress the fluctuation of the DC bus voltage in the micro-grid effective- ly. By establishing the mathematical models of the PV cell and accumulator, the relationship between the load power and output power of PV power generation is analyzed, the relational expressions of the coefficient k and the light intensity, and the coeffi- cient k and stored energy＇ s charging and discharging current are deduced, and a P-! controller is designed. The Simulink simu- lation results show that the P-I control method can effectively control the power balance of DC bus, and improve the system sta- bility.
出处
《现代电子技术》
北大核心
2017年第24期151-153,159,共4页
Modern Electronics Technique
基金
陕西省科技厅工业攻关项目(2015GY038)
