独立光伏系统交流侧与市网的联合供电研究

发布时间：2018-02-28 16:35

本文关键词： 光伏电池蓄电池市电工作模式能量管理策略　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：在不可再生能源的日益枯竭的情况下,当前各个国家都把研究的焦点集中在了太阳能上。由于光伏电池的输出功率受到光照强弱和外界环境的干扰,因此需要加入辅助电源。本文将光伏电池、蓄电池和市电同时结合起来,提出了一种新颖的独立光伏系统和市网相结合的联合供电方式。本文针对不同的外部环境,提出了一种合理的具有五种工作模式的能量管理策略,使系统能够在任何情况下都能稳定运行。即当光伏电池功率充足时,则为负载供电的同时向蓄电池充电。当光伏电池功率不够时,由光伏电池与蓄电池联合向负载供电。当光伏电池与蓄电池都不足以向负载供电时,由市网单独供电。该过程的具体实现是通过逻辑开关单元和能量管理电路产生相应的选通信号使电路中的能量流实现单向变换,双向变换,逆变以及切换,完成对能量的优化配置。本文所做的主要工作如下:首先设计了该系统的电路拓扑,并对拓扑中各个模块的工作原理进行了详细分析,包括Boost电路、双向Buck-Boost变换电路、切换电路以及逆变电路;其次,结合光伏电池与蓄电池的工作原理提出了系统的五种工作模式,对每种工作模式下的电路都提出了具体的控制方案。除此之外,针对系统的需求,本文还对逆变的电压电流双环控制及锁相控制进行了简明的分析,并针对系统的工作模式对主电路进行了硬件参数设计和软件设计以及相应的软硬件仿真。最后在实验平台上进行了实验验证,实验的结果证明了系统结构的合理性与能量管理策略的可行性。
[Abstract]:With the increasing depletion of non-renewable energy, many countries are focusing on solar energy. Because the output power of photovoltaic cells is affected by the intensity of light and the outside environment, Therefore, it is necessary to add auxiliary power supply. This paper combines photovoltaic cells, batteries and municipal power, and proposes a novel combined power supply mode of independent photovoltaic system and municipal grid. A reasonable energy management strategy with five working modes is proposed to enable the system to operate stably under any circumstances, that is, when the power of photovoltaic cells is sufficient, When the power of the photovoltaic cell is not enough, the photovoltaic cell and the battery are combined to supply the load. When the photovoltaic cell and the battery are not enough to supply the load, This process is realized by the logic switch unit and the energy management circuit to generate the corresponding strobe signal to make the energy flow in the circuit realize unidirectional transformation, bidirectional transformation, inversion and switching. The main work of this paper is as follows: firstly, the circuit topology of the system is designed, and the working principle of each module in the topology is analyzed in detail, including Boost circuit, bidirectional Buck-Boost transform circuit, and so on. Switching circuit and inverter circuit. Secondly, combining the working principle of photovoltaic cell and battery, the paper puts forward five working modes of the system, and puts forward the specific control scheme for the circuit under each working mode. According to the demand of the system, this paper also analyzes the voltage and current double loop control and the phase-locked control of the inverter. The hardware parameters and software of the main circuit are designed according to the working mode of the system, and the corresponding software and hardware simulation are carried out. Finally, the experiment is carried out on the experimental platform. The experimental results show the rationality of the system structure and the feasibility of the energy management strategy.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4;TM46

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