| Based on previous studies,this thesis has further researched dynamic experiments on photovoltaic power MPPT system based on equivalent impedance matching From the perspective of impedance matching method,a lot of work has been done on the input impedance model of the Boost converter and the dynamic calibration design of the system.Through the detailed theoretical analysis and detailed experimental verification of the maximum power point tracking technology based on the Equivalent Impedence Matching(EIM),a complete method with practical guidance significance is designed.Firstly,this paper introduces the engineering mathematical model photovoltaic cells and the principle and characteristics of equivalent impedance matching method.At the same time,under the conditions of battery load and resistive load,the input voltage model and input impedance model of the Boost converter at the maximum power point are established.And through the system simulation platform and system experimental platform,the accuracy of the model is effectively verified.Secondly,under different load conditions,the dynamic correction of the photovoltaic power generation MPPT system based on the EIM method was performed.It explores the reasons for the accuracy of the input impedance model in practice.By introducing a correction coefficient ? to Im in the input impedance model,it effectively responds to the above problems,so that the accuracy of the input impedance model is further improved;Through systematic experiments under different working conditions,the effectiveness of the input impedance model obtained after correction for the dynamic correction of the system was verified.At the same time,the correctness of the correction method and the effectiveness of the MPPT method based on the EIM algorithm are also proved.Finally,a set of complete methods with practical guidance significance is summarized,and basic work has been done for the application of the EIM method in engineering practice. |
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