Multi-step size based photovoltaic power generation system maximum power tracking control method

Abstract

The invention discloses a multi-step size based photovoltaic power generation system maximum power tracking control method. The multi-step size based photovoltaic power generation system maximum power tracking control method comprises the steps of firstly setting an initial disturbance step size; utilizing a function M=V*abs (dP / dV) to conduct demarcation on a photovoltaic cell P-V curve, taking step size d1 in a left-side region of a maximum power point when a value of a function dM / dV is greater than 0; taking step size d1*M / P when the value of the function dM / dV is smaller than 0; taking step size d2 in a right-side region of the maximum power point when a value of the function M is greater than power P; taking step size d2*M / P when the value of the function is smaller than the power P; The multi-step size based photovoltaic power generation system maximum power tracking control method is simple and practical, and the proportional relation of an initial fixed step size can be determined by utilizing photovoltaic cell panel parameters provided by a manufacturer. The problem that steady accuracy and dynamic tracking speed cannot be simultaneously considered in most of maximum power tracking controls is solved by means of the method.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation, in particular to a multi-step-based maximum power tracking control method for a photovoltaic power generation system. Background technique [0002] Solar energy resources are abundant, easy to obtain, clean and non-polluting. It is an important renewable energy source and has been widely used in recent years. As a kind of solar power generation, photovoltaic power generation has gradually become the main form of solar energy utilization. Compared with traditional power generation methods, photovoltaic power generation has the advantages of simple structure, high reliability, zero emission, no noise, small size, and long life. [0003] The efficiency of the photovoltaic power generation system is one of the most important indicators of the photovoltaic system. Tracking the high power point of the photovoltaic system is an important way to improve the efficiency of the ...

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Problems solved by technology

A Variable Step Size INC MPPT Method for PV Systems (Fangrui, L., et al., A Variable Step Size INC MPPT Method for PV Systems. IEEE Transactions on Industrial Electronics, 2008.55(7): p.2622-2628.) discussion A conductance incremental method with variable step size is proposed, and the step size formula with variable step size is given, but the tracking effect of this method is not very good in the case of drastic changes in external conditions, the working area of ​​variable step size is very small, and the system keeps working In the state of fixed step size, the steady-state power loss is large; the system works in the state of variable step size, and the dynamic tracking speed is slow, that is, there is a "dead zone" problem

A Novel Improved Variable Step-Size Incremental-Resistance MPPT Method for PV Systems (Mei, Q., et al., A Novel Improved Variable Step-Size Incremental-Resistance MPPT Method for PV Systems. IEEE Transactions on Industrial Electronics, 2011.58 (6 ): p.2427-2434.) Discussed a new type of variable step-size conductance increment method, proposed a step-size demarcation method and a step-size setting formula, but the step-size demarcation method has a large amount of calculation (requires multiple derivation operations), the step size setting formula fails to make full use of the boundary function, which also increases the amount of calculation, which brings certain difficulties to the realization of this method

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