含恒功率负荷的直流微电网储能变换器双层模糊控制方法  

Double-layer Fuzzy Control Method for DC Microgrid Energy Storage Converter With Constant Power Load

作　　者：林巾琳 黄晓立 耿昌易 邓奕星 LIN Jinlin;HUANG Xiaoli;GENG Changyi;DENG Yixing(Guangxi Power Grid Co.,LTD.,Nanning 530023,China;Guangxi Power Supply Bureau Co.,LTD.,Nanning Power Supply Bureau,Nanning 530001,China;Guodian Huayan Electric Power Technology Co.,LTD.,Guangzhou 510335,China)

机构地区：[1]广西电网有限责任公司,南宁530023 [2]广西电网有限责任公司南宁供电局,南宁530001 [3]国电华研电力科技有限公司,广州510335

出　　处：《微电机》2023年第11期49-54,77,共7页Micromotors

摘　　要：控制储能变换器能够避免直流微电网的储能单元出现过充和过放的问题,为了提高直流微电网在运行中的稳定性,提出一种含恒功率负荷的直流微电网储能变换器双层模糊控制方法。通过构建储能变换器的平均开关模型,得到直流微电网中含恒功率负荷的等效电路图,构建等效电路的微分方程,当微分状态方程逐渐收敛到平衡点时,判断直流微电网的运行状态,分析含恒功率负荷的储能变换器对直流微电网的影响。利用第一层模糊控制器调节直流微电网中储能变换器的SOC,利用第二层模糊控制器改善第一层模糊控制器在功率校正过程中出现的真实负载与负荷调度曲线偏离的问题,经过双层模糊控制,得到储能变换器的功率指令,实现储能变换器的双层模糊控制。实验结果表明,文中方法能够防止光伏电源输出功率与负荷消耗功率之间发生突变,从而避免蓄电池的初始SOC值较低而提前退出供电,提高直流微电网运行的稳定性。Controlling the energy storage converter can avoid the problems of overcharge and overdischarge of the energy storage unit of the DC microgrid.In order to improve the stability of the DC microgrid in operation,a double-layer fuzzy control method for the energy storage converter of the DC microgrid with constant power load was proposed.By constructing the average switching model of energy storage converter,the equivalent circuit diagram with constant power load in DC microgrid was obtained,and the differential equation of the equivalent circuit was constructed.When the differential state equation gradually converges to the equilibrium point,the running state of DC microgrid was judged,and the influence of energy storage converter with constant power load on DC microgrid was analyzed.The first-layer fuzzy controller was used to adjust the SOC of the energy storage converter in the DC microgrid,and the second-layer fuzzy controller was used to solve the problem that the real load deviates from the load scheduling curve in the power correction process of the first-layer fuzzy controller.Through the double-layer fuzzy control,the power command of the energy storage converter was obtained,and the double-layer fuzzy control of the energy storage converter was realized.The experimental results show that the proposed method can prevent the sudden change between the output power of photovoltaic cells and the power consumed by the load,thus avoiding the battery’s initial SOC value being low and withdrawing from power supply in advance,and improving the stability of DC microgrid operation.

关 键 词：直流微电网 双层控制 模糊控制器 储能变换器 恒功率负荷 稳定性 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]