Research On Multi-Peak MPPT Algorithms Based On Division Of Wave Crest Interval And Solution Of Linear Equation For Photovoltaic Power Generation

Due to the advantages of cleanness,pollution-free and easy realization,solar photovoltaic power generation has been praised by many governments and scholars,and has broad prospects for development in the future.With the rapid development of solar photovoltaic power generation,the maximum power point tracking(MPPT)technology has become a hot topic for researchers.In the case of partial occlusion,the output P-U characteristic curve of the series and parallel PV modules are not easy to track the global maximum power point.Aiming at this problem,a multi-peak MPPT algorithm for photovoltaic generation based on the division of the wave crest and solution of linear equation was proposed on the basis research of domestic and foreign scholars.The main contents are as follows:First of all,the models were built and the output characteristics were analyzed.A five parameter model was established of a single photovoltaic module,and the output characteristics were analyzed.On this basis,models of series photovoltaic modules without bypass diodes and with bypass diodes,parallel PV modules with only isolated diodes and with bypass diodes and isolation diodes were built.Also the output characteristics were analyzed.All of these provide the theoretical basis for the method of wave crest interval division.Then,the algorithms were designed.A new algorithm by solving the linear equation zero crossing voltage value to achieve single peak MPPT was designed.The number and distribution of wave crests under partial occlusion case for series and parallel PV modules were analyzed,so a wave interval division method was put forward.In the case of the combination of the two methods,a multi-peak MPPT algorithm for series and parallel PV modules was designed respectively.Again,the proposed algorithms were verified by simulation experiments.A MPPT simulation control system was built.Through that,the proposed multi-peak MPPT algorithms were verified by simulation experiment,and compared with global scanning combined with variable step size incremental conductance method.Then the correctness,rapidity and stability of the proposed algorithm were proved in theory.Finally,the proposed algorithms were verified by experiments.An experiment platform was set up.The proposed multi-peak MPPT algorithms were verified and compared by it.The results show that the designed algorithms were efficient,accurate and practical.