MPPT control method based on resistance matching of photovoltaic power generation system

A technology of photovoltaic power generation system and control method, which is applied in photovoltaic power generation, control/regulation system, and adjustment of electrical variables, etc., can solve the problems of low tracking accuracy, poor robustness of parameter perturbation, and inefficient use of energy.

CN110737302AInactive Publication Date: 2020-01-31HUANENG HAINAN POWER INC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-01-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an MPPT control method based on resistance matching of a photovoltaic power generation system. A fuzzy MPPT controller samples voltage and current values of a photovoltaic array in the power generation process in real time by means of a voltage and current circuit, an MPPT fuzzy control algorithm of the fuzzy MPPT controller is used to generated a PWM control signal by calculation and processing, the PWM control signal is used to control work of a Boost circuit, the duty ratio of a DC chopper circuit is adjusted, the load impedance matching is controlled, and thus, theinternal resistance of a circuit of the photovoltaic power generation system matches the load impedance most rapidly. The method has the advantages that the circuit of the photovoltaic power generation system can be started for power generation at extremely low illumination intensity, relatively low circuit serial resistance and very low consumption of the circuit itself by means of photovoltaic array simulation and fuzzy control, the photovoltaic power generation system can get up early and sleep late, the power generation time of the system is prolonged, the MPPT fuzzy control algorithm enable the system to run at the maximal power point, and the power generation capacity of the photovoltaic power generation system is improved.
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Description

Technical field

[0001] The invention relates to the field of photovoltaic power generation, in particular to an MPPT control method based on resistance matching of a photovoltaic power generation system. Background technique

[0002] The power output of the photovoltaic array has a nonlinear relationship with voltage and current, but under certain conditions of light intensity and temperature, the output of the photovoltaic array has a maximum power point, which requires dynamic control to track the maximum power point under different conditions ( Maximum powerpoint tracking abbreviation: MPPT).

[0003] MPPT control is essentially an optimization process. By measuring voltage, current and power, comparing their changes, determine the positional relationship between the current operating point and the peak point, and then control the current (or voltage) to the current operating point and The peak power point moves, and finally the control current (or voltage) swings back and fort...

Examples

Embodiment Construction

[0104] The present invention will be further described below in conjunction with the drawings and embodiments.

[0105] Such as Figure 8 with 9 As shown, the present invention is an MPPT control method based on photovoltaic power generation system attribute matching, including photovoltaic power generation system, fuzzy MPPT controller, voltage sampling, current sampling, driving and Boost boost circuit; said voltage sampling and current sampling circuit The output terminal of the photovoltaic array is connected, and the fuzzy MPPT controller performs real-time sampling of the voltage value and current value in the photovoltaic array power generation process through the voltage sampling and current sampling circuit, and then is calculated and processed by the MPPT fuzzy control algorithm on the fuzzy MPPT controller Generate PWM (Pulse Width Modulation) control signal, which controls the Boost boost circuit to work, adjusts the duty cycle of the DC chopper circuit, and realizes t...