基于改进型扰动观察法的MPPT控制策略研究

Research on MPPT Control Strategy Based on Improved Perturbation Observation Method

针对传统扰动观察法存在的动态响应和稳态精度不可同时兼顾的矛盾,提出了基于恒压法结合扰动观察法的MPPT(最大功率点跟踪)复合控制策略。在MPPT控制启动阶段先利用恒压法的快速性迅速定位最大功率点附近区域,再采用变步长扰动观察法对最大功率点进行精确定位。在Simulink仿真平台上搭建MPPT仿真模型,仿真结果表明,相对于传统扰动观察法,改进型MPPT控制策略不但启动迅速,外界环境突变时响应速度快,而且稳态精度高。

Given the contradiction between dynamic response and steady-state accuracy of traditional perturbation observation method,a composite MPPT(maximum power point track)control strategy based on constant voltage method and perturbation observation method is proposed.In the start-up stage of MPPT control,the fast speed of constant voltage method is used to locate the vicinity of the maximum power point,and then the variable step perturbation observation method is adopted for accurate location.MPPT simulation model is built on the Simulink simulation platform.The simulation results show that in contrast with the traditional perturbation observation method the improved MPPT control strategy can not only start quickly but respond quickly to sudden changes in the external environment and has high steady-state accuracy.