基于DSP的光伏MPPT控制板设计

Design of Photovoltaic MPPT Control Board Based on DSP

介绍了光伏电池最大功率点跟踪的原理;针对常规扰动观察法在跟踪到最大功率点后存在功率震荡的问题,提出了一种记忆历史控制量的策略,利用DSP的存储功能记录当前时刻和上一时刻的控制量及其对应的输出功率,从而利用最大输出功率对应的控制量进行控制,彻底解决扰动观察法在最大功率点的功率震荡问题。硬件部分包括两路交错并联Boost升压电路、驱动电路和采样电路的设计;软件部分基于TM320F28335进行了代码开发。实验结果表明该装置及算法能较准确地跟踪到最大功率点,且光伏电池最大功率输出时无震荡,验证了所设计装置的可行性。

The principle of maximum power point tracking for photovoltaic cells is introduced. Aiming at the problem of power oscillation after tracking the maximum power point by conventional perturbation observation method, a strategy of memorizing historical control quantity is proposed. The control quantity and corresponding output power of current and last time are recorded by the memory function of DSP, so that the control quantity corresponding to the maximum output power can be used for control. The problem of power oscillation at the maximum power point in perturbation observation method is thoroughly solved. The hardware part includes the design of two staggered parallel Boost circuit, driving circuit and sampling circuit, and the software part is developed based on TM320 F28335. The experimental results show that the device and algorithm can track the maximum power point accurately, and there is no oscillation when the maximum power output of photovoltaic cells, which verifies the feasibility of the designed device.