基于DSP28335的光伏逆变器研究

发布时间：2019-04-03 11:14

【摘要】：随着社会经济的快速发展,能源消耗越来越大,并且化石能源的燃烧也带来了严重的环境污染。因此,研究利用新型能源对人类可持续发展具有重大意义。太阳能作为一种可再生清洁能源,以其取之不尽用之不竭、使用范围广、无污染等巨大优势成为了现代新能源的研究热点,因此本文针对独立式三相光伏逆变器进行了分析设计。本文所设计的独立式光伏发电系统由光伏电池阵列、Boost变换器、蓄电池、三相全桥逆变器等部分组成。为了充分利用光伏阵列的电能,分析了光伏电池输出特性及最大功率点跟踪(MPPT)的扰动观察法、电导增量法、电压反馈法等三种控制方法,最终选用扰动观察法来实现光伏阵列的最大功率输出。针对独立式光伏发电系统,当光伏阵列发电不足时需要蓄电池给负载供电,确定了蓄电池充放电控制方法。三相全桥逆变器采用基于前馈解耦电流内环和电压外环的双闭环控制策略,利用SVPWM算法产生逆变器功率开关管通断的PWM波。在Simulink环境下搭建了仿真模型,结果表明扰动观察法很好的跟随了光伏阵列最大功率点,逆变器输出波形稳定。最后以TI公司的TMS320F28335作为主控芯片设计了控制电路,包括驱动、采样等硬件电路设计和基于CCS5.5编译环境的最大功率跟踪程序、逆变器控制程序和蓄电池充放电程序设计。本文基于电路的软硬件设计搭建实验平台,对所设计的光伏逆变电源进行了实验分析,进一步验证了设计的合理性。
[Abstract]:With the rapid development of the social economy, the energy consumption is getting more and more, and the burning of the fossil energy also brings serious environmental pollution. Therefore, it is of great significance to study the sustainable development of mankind with new energy. As a kind of renewable clean energy, the solar energy has become the hot spot of modern new energy because of its inexhaustible supply, wide application range and no pollution. Therefore, this paper analyses and designs the free-standing three-phase photovoltaic inverter. The independent photovoltaic power generation system is composed of a photovoltaic cell array, a boost converter, a storage battery, a three-phase full-bridge inverter and the like. In order to make full use of the electric energy of the photovoltaic array, three kinds of control methods such as the output characteristic of the photovoltaic cell and the maximum power point tracking (MPPT), the conductance increment method, the voltage feedback method and the like are analyzed, and the maximum power output of the photovoltaic array is finally realized by using the disturbance observation method. According to the free-standing photovoltaic power generation system, when the photovoltaic array has insufficient power generation, the storage battery is required to supply power to the load, and the charge-discharge control method of the storage battery is determined. The three-phase full-bridge inverter adopts a double-closed-loop control strategy based on the feedforward decoupling current inner loop and the voltage outer loop, and uses the SVPWM algorithm to generate the PWM wave of the on-off of the inverter power switch tube. The simulation model is set up in the Simulink environment. The results show that the disturbance observation method is good to follow the maximum power point of the PV array, and the output waveform of the inverter is stable. Finally, the control circuit is designed with the TMS320F28335 of TI company as the main control chip, including the hardware circuit design of driving and sampling and the maximum power tracking program, the inverter control program and the charge-discharge program design of the storage battery based on the CCS5.5 compiling environment. The experiment platform is set up based on the hardware and software design of the circuit, and the designed photovoltaic inverter power supply is analyzed and the rationality of the design is further verified.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464

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