光伏逆变并网模拟装置【毕业论文】.doc

- PAGE I - 本科毕业设计 （20 届） 光伏逆变并网模拟装置 所在学院 专业班级 电气工程及其自动化 学生姓名 学号 指导教师 职称 完成日期 年 月 PAGE I 摘　要 【摘要】本设计基于电压桥式逆变及光伏并网原理，以单片机最小系统为控制模块，用直流稳压电源和电阻模拟光伏电池，实现了光伏发电并网模拟系统的设计。系统由模拟光伏电池，DC-AC逆变电路，LC滤波电路，控制电路，取样测量电路等模块构成。在60V直流电源的供电下，系统具有最大功率点跟踪（MPPT）功能；当模拟电网频率及幅值改变时，系统能够跟踪模拟电网电压的频率及相位；当“光伏电池”内阻等于负载电阻时，DC-AC变换器的效率≥80%，输出电压失真度THD≤1%。而且系统具有欠压，过压及过流保护，当故障排除后，装置能够自动恢复到正常工作状态；单片机最小系统配合ZLG7289显示模块能够实时显示输出电压，电流及功率的大小。 【关键词】光伏；电压桥式逆变；MPPT；并网 Abstract 【ABSTRACT】This design is based on voltage-bridge inverter and grid-connected solar principle, the smallest single-chip microcomputer system for the control module, with the DC power supply and resistor simulation photovoltaic cells to achieve a simulation grid PV system design . System consists of simulation of photovoltaic cells, DC-AC inverter circuit, LC filter circuit, control circuit, sampling, measuring circuit module. In the 60V DC power supply, the system has a maximum power point tracking (MPPT) function; When the simulation grid frequency and amplitude changes, the system can track the analog line voltage frequency and phase; as photovoltaic cell resistance is equal to the load resistor, DC-AC converter efficiency of ≥ 80%, the output voltage distortion THD ≤ 1%. And the system has undervoltage, overvoltage and overcurrent protection, when troubleshooting, the device can automatically return to normal working condition; microcontrollers with ZLG7289 can real-time display output voltage, current and power size. 【KEYWORDS】Photovoltaic;voltage bridge inverter;MPPT;grid 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc293510489 摘　要 PAGEREF _Toc293510489 \h II HYPERLINK \l _Toc293510490 Abstract PAGEREF _Toc293510490 \h III HYPERLINK \l _Toc293510491 1 前言 PAGEREF _Toc293510491 \h 1 HYPERLINK \l _Toc293510492 1.1 选题背景 PAGEREF _Toc293510492 \h 1 HYPERLINK \l _Toc293510493 1.2 光伏发电系统的组成 PAGEREF _Toc293510493 \h 1 HYPERLIN