Multi-peak value maximum electric power tracking method based on power incremental method

Abstract

The invention discloses a multi-peak value maximum electric power tracking method based on a power incremental method. First, assuming that the starting point of the photovoltaic system is located at point P1, starting from the right side of the photovoltaic array P-V curve to the left; tracking power increment and voltage increment of each time are [delta]P and [delta]V, respectively; assuming that the next moving position is P2', according to the load line at the moment, the work point of tracking is moved to the intersection point P2 with the P-V curve; repeating the above process for multiple times, the working point reaches the first maximum power at the right side; repeating step S2 again and calculating the next tracking work point Pm; the work point is directly moved to around a photovoltaic array short-circuit current again and tracks from the left side of the photovoltaic array to the right until the voltage of the tracking work point exceeds Pm; determining that the searching of whole photovoltaic array is finished; determining the position where the point of the maximum power is and the P&O method is started to use to maintain the algorithm working around GMPP. The method is simple and clear and the tracking is fast.

Description

technical field [0001] The invention relates to maximum power tracking of a photovoltaic system, in particular to a multi-peak maximum electric power tracking method based on a power increment method. Background technique [0002] When the photovoltaic array is not shaded, there is only one single maximum power point (Maximum Power Point, MPP) on its P-V curve, such as figure 1 shown. At this time, the traditional maximum power point tracking algorithm (Maximum Power Point Tracking, MPPT), such as the perturbation and observation method (Perturb&Observe, P&O), incremental conductance method (IncrementalConductance, INC), Beta method, etc., can effectively track its MPP. However, when the photovoltaic array is partially shaded, such as figure 2 As shown, multiple local maximum power points (Local Maximum Power Point, LMPP) and a global maximum power point (Global Maximum Power Point, GMPP) will appear on the P-V curve. At this time, the traditional MPPT algorithm may make...

AI Technical Summary

Problems solved by technology

Due to the occurrence of such misjudgment, the entire photovoltaic array may not be able to output its maximum power

[0007] 2. Slow tracking speed and low efficiency

At this time, the H.Patel algorithm will have to track these peaks in turn, thus greatly increasing the tracking time and reducing the tracking efficiency

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