基于改进型短路电流法的温差发电MPPT方法

MPPT method for thermoelectric generators based on improved short circuit current method

为了能够提高温差发电器(TEG)的发电效率并保证其输出功率的稳定性,提出了一种基于短路电流法的温差发电最大功率点跟踪(MPPT)控制算法,解决了传统温差发电MPPT方法存在的TEG输出功率震荡以及静态误差的问题。该方法只需要采集电感电流并对采样数据进行运算处理即可计算出短路电流,通过控制器将电感电流的有效值控制在短路电流的1/2处,进而实现最大功率点跟踪。仿真和实验结果表明所提出的短路电流最大功率点跟踪方法能够有效地跟踪最大功率点,且控制算法简单、可靠性高。

In this paper,in order to effectively improve the generation efficiency and output power stability of thermoelectric generator(TEG),a maximum power point tracking control algorithm for short-circuit current of TEG is proposed,and solve the problems of TEG output power oscillation and static error existing in the traditional MPPT method of TEG.This method can calculate the short-circuit current only by collecting the inductance current and processing the sampling data.The effective value of the inductance current is controlled at 1/2 of the short-circuit current by the controller,and then the maximum power point tracking is realized.The simulation and experimental results show that the maximum power point tracking method proposed in this paper can effectively track the maximum power point,and the control algorithm is simple and reliable.