小功率家用光伏发电储能系统的研究

发布时间：2018-04-22 06:10

本文选题：光伏 + 非隔离逆变器　；参考：《北京交通大学》2015年硕士论文

【摘要】：能源危机的日渐加重以及化石能源对环境的污染,都在不断促使着新能源发电技术的进步。其中,光伏发电因为储量大、无污染等优势得以被越来越多地推广与应用。分布式微网的快速发展以及我国诸多偏远地区输电困难等因素,也为我国光伏发电事业带来了美好的前景。本文对小功率家用光伏发电储能系统进行了研究与设计。该系统集升压控制、逆变、储能等部分于一体,便于安装、使用,拥有较好的商业前景。文中首先对本系统所采用的Boost升压电路、全桥逆变电路以及储能电路的工作原理进行了分析,并详细介绍了逆变电路中的SPWM调制方式。由于采用了非隔离拓扑,系统在并网工作模式下,会产生严重的漏电流,文中对漏电流的产生和抑制原理进行了解释和说明,决定采用加入共模滤波器的方式来抑制漏电流,并通过仿真验证了该设计的可行性。本文对系统的闭环设计、光伏电池的特性、MPPT的实现、储能环节的充电方案都进行了研究与设计,采用了变步长电导增量MPPT法和三段式充电控制方式对系统进行控制。在本文理论研究基础上设计了5kW小功率家用光伏发电储能系统样机。文中采用IGBT和MOSFET作为开关器件的选择,对电感、电容等元件参数进行了详细地设计,并针对系统需求,设计了相应的采样调理和保护电路。最后介绍了控制芯片TMS320F28335的外围设计和端口分配。本文最后对该系统进行了仿真和实验,验证了所用拓扑及调制方式的高效性,测试最高效率可达94.4%。仿真中就MPPT算法对整个光伏系统的可行性也进行了验证,稳态跟踪效率保持在99%以上,能最大限度地利用电池板的功率。本文对双向储能电路也进行了仿真,验证了该电路的可行性。
[Abstract]:The worsening energy crisis and the pollution of fossil energy to the environment are promoting the progress of new energy generation technology. Among them, photovoltaic power generation has been more and more widely used because of its large reserves and no pollution. The rapid development of distributed microgrid and the difficulties of transmission in many remote areas in China also bring a bright prospect for photovoltaic power generation in China. In this paper, the energy storage system of low-power household photovoltaic power generation is studied and designed. The system integrates booster control, inverter, energy storage and so on. It is easy to install and use, and has a good commercial prospect. In this paper, the working principle of Boost boost circuit, full-bridge inverter circuit and energy storage circuit used in the system are analyzed, and the SPWM modulation mode in the inverter circuit is introduced in detail. Due to the use of non-isolated topology, the system will produce serious leakage current in grid-connected operation mode. The principle of leakage current generation and suppression is explained and explained in this paper, and the common mode filter is adopted to suppress leakage current. The feasibility of the design is verified by simulation. In this paper, the closed-loop design of the system, the characteristic of photovoltaic cell and the realization of MPPT, the charging scheme of energy storage link are studied and designed. The variable step conductance increment MPPT method and the three-stage charging control method are used to control the system. Based on the theoretical research in this paper, the prototype of 5kW small power household photovoltaic energy storage system is designed. In this paper, IGBT and MOSFET are used as switching devices to design the inductance and capacitance in detail, and the corresponding sampling conditioning and protection circuits are designed according to the system requirements. Finally, the peripheral design and port allocation of TMS320F28335 are introduced. Finally, the simulation and experiment of the system are carried out, and the efficiency of the topology and modulation is verified. The highest efficiency of the test can be up to 94. 4%. In the simulation, the feasibility of the whole photovoltaic system is verified by MPPT algorithm. The steady-state tracking efficiency is over 99%, and the power of the battery panel can be used to the maximum extent. In this paper, the two-way energy storage circuit is also simulated to verify the feasibility of the circuit.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM615

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