A method for equal power control of photovoltaic power generation system based on optimized fibonacci sequence

Abstract

The invention discloses a method for equal power control of a photovoltaic power generation system based on an optimized Fibonacci sequence. The power is calculated by measuring the PV side voltage and current of the system, and then the Fibonacci sequence is used to realize equal power adjustment of the PV curve; after determining the limit command , to determine the position of the maximum power point of the system, and use the fill factor FF to estimate the voltage value V of the equal power curve k ’, when the actual detected (V k >V k ') and (P k >P 0 ), indicating that the equal power point has not been searched yet, and V k If the estimated value of the fill factor FF has been exceeded, the Fibonacci sequence will be initialized at the next moment, and the equal-power point will be searched for in a small step size. In some cases, the system needs to narrow down the search scope. The application of the present invention can effectively avoid the problem of large power offset in the system due to the use of large step size, improve the system accuracy, and solve the problem in the prior art that the Fibonacci causes a large power error rate of the system at the time of termination.

Description

technical field [0001] The invention relates to a method for equal power control of a grid-connected photovoltaic inverter, in particular to a method for equal power control of a photovoltaic power generation system based on an optimized Fibonacci sequence. Background technique [0002] With the process of global industrialization, human beings' demand for energy is constantly increasing, and the consumption of the entire energy industry is mainly based on fossil energy. The energy structure dominated by fossil energy has caused atmospheric and other types of environmental pollution and ecological damage, and its Energy is not renewable. [0003] Facing the global energy crisis and environmental pressure, it is urgent to use renewable energy to replace conventional energy with limited resources and polluting the environment. Research and practice have shown that solar energy is the most abundant renewable energy resource, it is widely distributed, renewable, and does not po...

AI Technical Summary

Problems solved by technology

[0005] 1. The first type, the range of change is very small, the cycle is very short, and its change has a lot of chance;

[0006] 2. The second type has a large fluctuation range and a long cycle, which is an impact load;

[0023] However, in the power control of the photovoltaic power generation system using the Fibonacci sequence, it has a small step size in the initial state, and the convergence speed is fast, and then it still maintains a large step size at the end, so that the power error rate of the system is large at the end

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