含负荷功率自动分配的独立直流微电网协调控制
发布时间：2018-10-12 08:01
【摘要】：针对独立运行直流微电网,提出了含负荷功率自动分配的协调控制策略。孤岛运行状态下,直流微电网需独自承担系统电压稳定,为此采用多组小容量储能单元平衡分布式电源(DG)和负荷功率从而控制母线电压稳定。同时,为了避免储能系统过充和过放以及降低对通讯的依赖程度,根据各储能单元的荷电状态(SOC)和最大功率设计自适应下垂控制自动协调不同储能单元之间的负荷功率分配,可减小电压波动。当储能系统充电功率超过其最大允许功率或满充时,不同DG单元根据各自最大输出功率由最大功率跟踪控制(MPPT)切换为带有电压前馈补偿的下垂控制模式稳定母线电压和自动分配负荷功率,并考虑各单元的输出阻抗来提高分配精度。最后利用Matlab/Simulink对所设计的控制策略在不同运行模式下进行仿真验证,仿真结果表明所提出的控制策略可协调不同模式下独立直流微电网稳定运行和实现负荷功率自动分配。
[Abstract]:A coordinated control strategy for independent operation of DC microgrid is proposed in this paper. In the condition of isolated island operation, the DC microgrid has to bear the voltage stability of the system alone. In order to control the voltage stability of the bus, several small capacity energy storage units are used to balance the distributed power supply (DG) and load power. At the same time, in order to avoid overcharge and overplay of energy storage system and reduce the dependence on communication, adaptive sag control is designed to automatically coordinate the load power distribution among different energy storage units according to the charge state (SOC) and maximum power design of each energy storage unit. The voltage fluctuation can be reduced. When the charging power of the energy storage system exceeds its maximum permissible power or when it is fully charged, According to their maximum output power, different DG cells switch from maximum power tracking control (MPPT) to sag control mode with voltage feedforward compensation to stabilize bus voltage and automatically distribute load power. The output impedance of each unit is considered to improve the distribution accuracy. Finally, the designed control strategy is simulated under different operation modes by using Matlab/Simulink. The simulation results show that the proposed control strategy can coordinate the stable operation of the independent DC microgrid in different modes and realize the automatic load distribution.
【作者单位】： 上海电力学院电气工程学院;国网安徽省电力公司蚌埠供电公司;天津大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(61403246) 上海教委科研创新项目(15ZZ085) 中国博士后科学基金研究项目(2014M560187) 上海绿色能源并网工程技术研究中心项目资助(13DZ2251900)~~
【分类号】：TM727
[Abstract]:A coordinated control strategy for independent operation of DC microgrid is proposed in this paper. In the condition of isolated island operation, the DC microgrid has to bear the voltage stability of the system alone. In order to control the voltage stability of the bus, several small capacity energy storage units are used to balance the distributed power supply (DG) and load power. At the same time, in order to avoid overcharge and overplay of energy storage system and reduce the dependence on communication, adaptive sag control is designed to automatically coordinate the load power distribution among different energy storage units according to the charge state (SOC) and maximum power design of each energy storage unit. The voltage fluctuation can be reduced. When the charging power of the energy storage system exceeds its maximum permissible power or when it is fully charged, According to their maximum output power, different DG cells switch from maximum power tracking control (MPPT) to sag control mode with voltage feedforward compensation to stabilize bus voltage and automatically distribute load power. The output impedance of each unit is considered to improve the distribution accuracy. Finally, the designed control strategy is simulated under different operation modes by using Matlab/Simulink. The simulation results show that the proposed control strategy can coordinate the stable operation of the independent DC microgrid in different modes and realize the automatic load distribution.
【作者单位】： 上海电力学院电气工程学院;国网安徽省电力公司蚌埠供电公司;天津大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(61403246) 上海教委科研创新项目(15ZZ085) 中国博士后科学基金研究项目(2014M560187) 上海绿色能源并网工程技术研究中心项目资助(13DZ2251900)~~
【分类号】：TM727
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