【作者】 王青；

【导师】 赵清林；

【作者基本信息】 燕山大学 ， 电工理论与新技术， 2012， 硕士

【摘要】 随着能源危机和环境问题的日益严重，新能源的开发利用已经成为一种必然的趋势。将多种形式的新能源和储能设备结合起来组成新能源联合供电系统，可以实现新能源的高效利用，得到稳定的电力输出。但是在新能源联合供电系统中，每个新能源发电单元和储能单元都需要独立的DC-DC变换器，将各能源转化的电能转换为直流输出，并联在公共直流母线端。为了整合系统拓扑及控制结构，采用一个多输入直流变换器(Multiple-Input Converter)代替多个单独的DC-DC变换器，不仅可以简化新能源联合供电系统的结构，还能降低系统运行成本。本文以光伏电池和蓄电池作为输入源，对多输入直流变换器的控制和能量管理策略进行了研究。本文在查阅了大量的国内外资料的基础上，选定了多输入双向半桥变换器作为本系统的研究拓扑。根据能量的传递方向将电路的工作过程分为正反两个状态，结合电路的工作波形分别对正反两个状态下的电路工作原理进行了分析，并根据能量关系的不同确定了电路的三种工作模式。重点对系统的闭环控制和能量管理策略进行研究。为了实现光伏电池的最大功率跟踪控制和确保系统输出电压的稳定，采用PWM+相移的控制策略。通过MATLAB仿真对系统的整体运行状况进行了验证，仿真结果证明了系统闭环控制策略的有效性：当光伏电池的输出功率或负载端功率发生变化时，系统可以实现工作模式的自动切换。最后对系统的硬件电路和软件实现进行了设计，搭建了系统实验平台，以DSP芯片dsPIC33FJ16GS504为控制核心，编写了相关软件程序，对系统的工作过程进行了实验验证，实验结果与理论分析和仿真波形一致，验证了系统控制策略的正确性和可行性，基本实现了预期的研究目标。更多还原

【Abstract】 With the increasingly serious energy crisis and environmental problems, the newenergy development and utilization has become an inevitable trend. By combining varietyof new forms of energy and energy storage device, a high energy efficiency can beachieved and a stable power output can be obtained. In the new energy power supplysystem, DC-DC converter is required in each new energy power generation unit and theenergy storage unit, which converts the eletrical energy to DC output, which connected tothe DC bus terminal. In order to integrate the system topology and control structure, amultiple-input DC-DC converter is used instead of the original multiple separate powerconverter, it can simplify the new energy supply system structure, reduce the system cost.In this paper, by using the photovoltaic cell and battery as the input source, a research isdone on the multiple- input DC-DC converter control and energy management strategy.In this paper, multiple-input bidirectional half-bridge converter system is selected asresearch topology, based on a large number of domestic and foreign information,According to the energy transfer directions, the working process of the circuit is dividedinto two positive and negative state, combined with the circuit work waveform of positiveand negative to analysis the circuit principle. and three working modes of the circuit isproposed according to the different energy relationshipThis paper is focused on the system closed loop control and energy managementstrategy. In order to achieve photovoltaic maximum power tracking control and ensure thestability of the output voltage, to determined the PWM + phase shift control strategy. Therunning status of the whole system is verified through Matlab simulation, the simulationresults show that the closed loop control strategy is effective, when the output power ofphotovoltaic cell or the load power is changed, the system can realize the working modeswitching automatically.Finally, the system hardware circuit and the main components of the parameters weredesigned in this paper. A system experimental platform is built, with the DSP chipdsPIC33FJ16GS504 as the control core, By software programming, working process of the system was verified by the experiment. The feasibility and correctness of the proposedtheory are verified according to the experimental results and the simulation waveforms,basically achieve the research objectives.更多还原