Photovoltaic power supply

Abstract

The invention provides a photovoltaic power supply. The photovoltaic power supply comprises a Boost circuit, a capacitor, a current detection circuit, a voltage detection circuit, a multiplying circuit, a first delay circuit, a second delay circuit, a first comparison circuit, a second comparison circuit, an inclusive-OR logic circuit and a driving circuit. According to the change rule of the output voltage and the output power of a photovoltaic cell, a logic control circuit is formed; on or off control on a power electronic device in a power conversion circuit can be realized; the circuit structure is simple; the tracking speed is rapid; the practicability is high; in a process of tracking the maximum power point, any control algorithm and control strategy is unnecessary; the problems, such as controller design and control parameter adjustment, in the traditional methods, such as a perturbation and observation method and an incremental conductance algorithm, can be avoided; and thus, the photovoltaic power supply is easy to implement.

Description

Technical field [0001] The invention relates to a photovoltaic power source, in particular to a photovoltaic power source capable of tracking the maximum power point of a photovoltaic cell. Background technique [0002] At present, there are many types of MPPT control methods for photovoltaic power sources. According to the specific form of the control algorithm, MPPT control methods can be divided into direct MPPT control methods based on sampled data, indirect control methods based on parameter selection methods, and artificial intelligence control methods. The more commonly used MPPT algorithms include constant voltage method, disturbance observation method, admittance increment method, artificial neural network method, fuzzy control method and so on. Disturbance observation method is widely used because of its simple tracking method and easy implementation. However, it has disadvantages such as oscillation near the power point. When the light intensity changes drastically, th...

AI Technical Summary

Problems solved by technology

The perturbation and observation method is widely used due to the advantages of simple tracking method and easy implementation, but it has disadvantages such as oscillation near the power point. When the light intensity changes sharply, there will be misjudgment of the direction, and the tracking accuracy will decrease when the load changes. , it is often necessary to modify the parameters of the PI controller; the control algorithm of the admittance incremental method and the artificial neural network method is more complex, the amount of calculation is large, and the sampling accuracy is high, and the actual application is also limited by the hardware conditions; the fuzzy control method is due to the The dependent control rules lack online self-learning ability, controller parameters lack self-adjusting ability, etc., and it is difficult to meet the actual control needs

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