杨健维,张 雪,廖 凯,郑舜玮
AuthorsHTML:杨健维，张 雪，廖 凯，郑舜玮
AuthorsListE:Yang Jianwei,Zhang Xue,Liao Kai,Zheng Shunwei
AuthorsHTMLE:Yang Jianwei，Zhang Xue，Liao Kai，Zheng Shunwei
Unit:西南交通大学电气工程学院，成都 611756
Unit_EngLish:School of Electrical Engineering，Southwest Jiaotong University，Chengdu 611756，China
Abstract_Chinese:针对传统协调方法基于直流电压信号在不同状态运行时会造成电压偏差的问题，提出一种基于双层电压信 号的光储燃直流微电网分层协调控制策略．首先，考虑直流微电网多源的特点，研究以光伏和蓄电池为主要供电电 源、燃料电池为辅助供电电源的直流微电网结构，光伏发电单元和蓄电池发电单元构成光储联合发电系统，消除光 伏直接接入母线造成的电压波动．综合考虑微电源发电和负荷需求的优先级，对直流微电网运行状态按照稳定电压 的微电源类型进行划分．其次，为协调光伏和蓄电池出力，内层控制基于光伏和蓄电池的输出电压信号自适应变更 光伏和蓄电池的控制方式．为协调光储联合发电系统和燃料电池出力，外层控制基于母线电压信号自适应变更两者 的控制方式．此外在外层协调控制中，光储联合发电系统采用一种基于运行状态驱动的自适应下垂控制方法，实现 并联的各光储联合发电系统运行状态的统一．最后，基于 Matlab/Simulink 仿真平台搭建光储燃直流微电网模型，分 别验证光储联合发电系统对光伏出力波动的抑制能力和光储燃直流微电网各运行状态的自适应切换的有效性，并与 传统基于单层电压信号的协调控制方法进行对比．仿真结果表明，该协调控制策略可以保证母线电压稳定在额定 值，实现独立直流微电网稳定运行．
Abstract_English:A two-layer coordination control scheme is proposed based on the voltage signal of the photovoltaic (PV)/battery/fuel cell (FC)-based DC microgrid to eliminate the voltage deviation caused by the traditional voltage signal-based method. First，considering the multisource characteristics，the DC microgrid structure is studied using the combination of PV and battery (CPB) as main power supply and the FC as auxiliary power supply，with the CPB being used to handle the stochastic output power of PV. Furthermore，the operating states of the DC microgrid are classified based on the defined priority microgeneration and load demand. Next，the inner control adaptively changes control modes of PV and battery based on the output voltage signal to coordinate the output of PV and battery. More\u0002over，the outer control adaptively changes control methods based on the bus voltage signal to coordinate the output of CPB and FC. We proposed an adaptive droop control based on operating state driving in the outer control to achieve the unification of the operating states of the parallel CPB. Finally，the studied DC microgrid is built based on the Matlab/Simulink platform，and comparisons with the traditional single-layer voltage signal-based control are ana\u0002lyzed to validate the effectiveness of the proposed method. Simulation results show that the proposed control method can restore the bus voltage to the rated value and achieve stable operation of the studied DC microgrid.
Keyword_Chinese:直流微电网；协调控制；双层直流电压信号；自适应下垂控制；光储联合发电系统
Keywords_English:DC microgrid ； coordinated control ； two-layer DC voltage signal ； adaptive droop control ； combination of photovoltaic and battery

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