Buck-Boost型多端口变换器建模与功率管理研究

发布时间：2018-03-24 02:39

本文选题：多端口变换器　切入点：直流微网　出处：《扬州大学》2016年硕士论文

【摘要】：多端口变换器(Multiport Power Electronic Interface,MPEI)是直流微电网络中的有源节点,可以将分布式能源及其必要的储能设备结合,实现发电、储能、用电过程的综合控制和统一管理。本研究以连接光伏能源、储能装置和终端负载的直流微网系统为研究背景,针对Buck-Boost型的MPEI,进行多端口变换器的底层控制系统设计和功率管理研究。提出了以Buck-Boost为基本功率单元的拓扑结构,并分析了该MPEI的PWM工作模式：进而以此工作模式为依据,针对直流微网各端口的特性,利用状态空间平均法和小信号分析法得出满足各端口应用要求的数学模型。针对光伏端口的特性,提出了最大功率跟踪(MPPT)策略；分析了MPEI的电路参数和控制对象特性,探讨了母线电压控制和直流潮流管理的需求,设计了可以连通一个光伏、双储能单元和直流微网母线的MPEI控制系统,并在此基础上针对每个控制目标进行控制系统设计；引入主动均流因子实现对瞬时电流的快速、有效分配,并通过MATLAB/SIMULINK的控制模块仿真和Simulink-PLECS联合仿真验证了控制系统设计和电路运行性能。阐述了利用MPEI对多组储能装置进行潮流分配的必要性并将功率管理机制嵌入控制算法设计之中,实现了对瞬态能量的综合管理。运用控制理论设计并制作了由多端口变换器构建的直流微网样机,实验结果表明,样机验证了系统设计的正确性、母线电压控制策略的有效性；同时证明了该MPEI设计具备瞬态能量管理功能,验证了该潮流分配控制方案的可行性。
[Abstract]:Multiport Power Electronic Interface (MPEI) is an active node in DC microelectric network. It can combine distributed energy and necessary energy storage equipment to generate and store energy. Integrated control and unified management of electrical processes. The research background of this study is the DC microgrid system which connects photovoltaic energy, energy storage device and terminal load. In this paper, the bottom control system design and power management of multi-port converter are studied in view of MPEI of Buck-Boost type. The topology structure of Buck-Boost as the basic power unit is proposed, and the PWM operation mode of the MPEI is analyzed, which is based on the operation mode. According to the characteristics of each port of DC microgrid, the state space averaging method and the small signal analysis method are used to obtain the mathematical model to meet the requirements of each port. According to the characteristics of the photovoltaic port, the maximum power tracking (MPPTT) strategy is proposed. The circuit parameters and control object characteristics of MPEI are analyzed. The requirements of bus voltage control and DC power flow management are discussed. A MPEI control system which can connect a photovoltaic, dual energy storage unit and DC microgrid bus is designed. On the basis of this, the control system is designed for each control object, and the active current sharing factor is introduced to realize the fast and effective distribution of instantaneous current. The design of the control system and the performance of the circuit are verified by the simulation of the control module of MATLAB/SIMULINK and the joint simulation of Simulink-PLECS. The necessity of using MPEI to distribute the power flow of the multi-group energy storage device is expounded, and the power management mechanism is embedded in the design of the control algorithm. The control theory is used to design and manufacture the DC microgrid prototype constructed by multi-port converter. The experimental results show that the system design is correct and the bus voltage control strategy is effective. At the same time, it is proved that the MPEI design has the function of transient energy management, and the feasibility of the power flow allocation control scheme is verified.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46

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