摘要本论文主要完成了 5KW 太阳能发电并网系统的设计工作。首先介绍了太阳 能发电的发展情况，简要讨论了太阳能电池组件的搭建和选用的太阳能电池型号。 使用 Matlab/Simulink 仿真构建了太阳能电池板组件的工程数学实用模型。随后 运用新建立的模型仿真分析了常见的最大功率点跟踪算法（MPPT），比较了干扰 观察法和电导增量法两种算法的优缺点。设计 Boost 电路仿真模型，论证了 DC/DC 变换器实现 MPPT 算法的可行性。简要介绍常用孤岛效应检测算法。最 后给出了电路硬件设计。69946

本装置选用两级式非隔离单相电路，前级选用 Boost 型 DC-DC 直流变换电 路，后级逆变电路选用全桥 DC-AC 逆变电路，控制电路选用 TI 公司的 DSP 控制 器 TMS320F28335，SPWM 波的实现选择采用规则采样法，结合 DSP 内部的 ePWM 发生模块输出精确的 SPWM 波。最大功率点跟踪（MPPT）采用了电导增 量发法来实现，并用软件锁相环进行系统的同频、同相控制，控制灵活简单。使 用 DSP 内部自带的 12 位 A/D 转换模块对各路模拟信号进行信号采样和幅值检 测，模块化设计和使用 DSP 内部资源大大简化了系统的硬件电路设计并且大大 节约了成本。

毕业论文关键词： 太阳能发电 并网 MPPT DSP 孤岛效应

5KW Solar Power Grid System

Abstract This paper mainly completes the design of 5KW solar power generation grid system. First, the development of solar power generation is introduced and the construction of solar cell modules, as well as the selection of solar cell models is briefly discussed in this paper. The practical engineering mathematical model of solar cell panel assembly is constructed by using Matlab/Simulink simulation. Then the common maximum power point tracking algorithm (MPPT) is simulated and analyzed by using the new model, and the advantages and disadvantages of Interference observation method and incremental conductance are compared. The Boost circuit simulation model is designed to demonstrate the feasibility of the DC/DC converter realizing the MPPT algorithm. A brief introduction of the detection algorithm islanding effect is illustrated. Finally, the hardware design of the circuit is given.

This device adopts two-stage non isolation single-phase circuit, with the preceding stage selection of boost type DC-DC converter, subsequent stage inverter circuit selection of full bridge DC-AC inverter circuit and the usage of Ti Company DSP controller TMS320F28335 as control circuit determined as well as the selection of the regular sampling method to achieve SPWM wave, is combined with the DSP internal ePWM generating module and outputs accurate SPWM waves. The maximum power point tracking (MPPT) is realized by the incremental conductance method, and the system is simply and flexibly controlled in the same frequency and phase with the Software Phase-Locked Loop. The 12 bit A/D conversion module within the DSP is used in various analog signals for signal sampling and amplitude detection, modular design and the use of the internal resources of within DSP greatly simplifies the hardware circuit design of the system and saves the cost.

Key Words： solar power generation grid-connected MPPT DSP Islanding effect

目 录

摘 要 I

Abstract II

1  绪论 1

1.1 光伏发电的背景和意义