基于交错并联flyback的新型光伏阵列控制器研究

发布时间：2018-05-04 08:37

本文选题：交错并联 + 准谐振　；参考：《浙江大学》2016年硕士论文

【摘要】：光伏产业当下发展迅猛,光伏产品的效率与成本仍是两个不可忽视的问题。由于光伏组件的输出呈非线性,并且其开路电压短路电流等关键参数也会随温度、辐射照度等环境因素而改变,尤其是民用、商用级产品,非常容易受到局部环境光遮蔽等因素的影响,因此针对由光伏组件组成的光伏阵列的最大功率点追踪,保持较高的效率与较低的成本是个难题。本文首先分析了光伏组件的特性,总结了几种常用的MPPT控制算法,然后从效率和控制器成本的角度分析了光伏阵列的分布式MPPT控制方案。针对分布式MPPT控制方案在DSP、传感器方面的高成本问题,基于交错并联flyback变流器,提出了一种新的基于导通时间的MPPT控制方案,可以仅采样输入电压而不需要电流传感器,进行功率计算,使用一片TMS320F28035实现每个模块式光伏阵列子系统的MPPT,既能实现MPPT的追踪,应对局部环境光遮蔽,又能节约成本。为了减轻变流器输入输出电容的滤波压力,本文将交错技术应用于flyback电路。为提高变流器效率,对硬件和软件进行了设计,使flyback工作于准谐振软开关状态。DSP选用了TMS320F28035,具有CLA协处理器,支持浮点运算和双核并行运算。经过硬件和软件的详细设计,搭建了仿真和实验平台,基于TMS320F28035编写了多核并行控制程序,通过仿真和实验,实现了基本功能,最终验证了电路设计、控制策略的可行性。
[Abstract]:With the rapid development of photovoltaic industry, the efficiency and cost of photovoltaic products are still two problems that can not be ignored. Because the output of PV module is nonlinear, and the key parameters such as open circuit voltage, short circuit current and so on will change with environmental factors such as temperature, illuminance and so on, especially for civilian and commercial grade products. Therefore, it is difficult to keep high efficiency and low cost for the maximum power point tracking of photovoltaic arrays composed of photovoltaic modules. This paper first analyzes the characteristics of photovoltaic modules, summarizes several common MPPT control algorithms, and then analyzes the distributed MPPT control scheme of photovoltaic arrays from the point of view of efficiency and controller cost. Aiming at the high cost of distributed MPPT control scheme in DSP sensor, a new MPPT control scheme based on on-time is proposed based on staggered parallel flyback converter, which can only sample input voltage without requiring current sensor. For power calculation, the MPPTs of each module photovoltaic array subsystem can be realized by using a piece of TMS320F28035, which can not only realize the tracking of MPPT, but also save the cost of local environmental light masking. In order to reduce the filter pressure of input and output capacitance of converter, this paper applies interleaving technique to flyback circuit. In order to improve the efficiency of the converter, the hardware and software are designed. The TMS320F28035 is selected to work in the quasi resonant soft switching state. The TMS320F28035 is used to support the floating-point operation and dual-core parallel operation. Through the detailed design of hardware and software, the simulation and experiment platform is built, and the multi-core parallel control program based on TMS320F28035 is written. Through simulation and experiment, the basic functions are realized. Finally, the feasibility of circuit design and control strategy is verified.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM615

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