【摘要】 针对传统MPPT难以同时具备跟踪速度快、跟踪精度高的问题，提出分区变步长MPPT(Maximum Power Point Tracking),达到更好的跟踪效果。针对数字延时的问题，采用三阶pade近似计算将延时考虑到控制系统中。针对LCL的耦合性、电网波动剧烈的问题，采用LADRC进行控制，使电网波动剧烈时系统也可正常运行。通过MATLAB/Simulink建立光伏发电并网模型，验证所提出的控制策略，结果具有较强的鲁棒性，并保证并网电流稳态THD小于2%。更多还原

【Abstract】 Aiming at the problem that traditional MPPT(Maximum Power Point Tracking) cannot simultaneously achieve fast tracking speed and high tracking accuracy, a partition variable step size MPPT is proposed to achieve better tracking performance. In order to solve the problem of digital delay, the three-order pade approximate calculation is used to take the delay into account in the control system. In response to the coupling of LCL and the severe fluctuations in the power grid, LADRC is used for control, so that the system can also operate normally when the power grid fluctuates severely. Establish a photovoltaic grid connected model using MATLAB/Simulink to verify the proposed control strategy, which has strong robustness and ensures that the steady-state THD of the grid connected current is less than 2%.更多还原