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Photovoltaic optimizer for providing stable output voltage and application thereof

A technology of stable output and optimizer, applied in output power conversion devices, photovoltaic modules, photovoltaic power generation, etc., to achieve the effect of improving photovoltaic power generation efficiency, small size and light weight, and high integration.

Pending Publication Date: 2022-01-28
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is currently no effective solution to optimize the design of the photovoltaic optimizer to achieve the function of stabilizing the output voltage.

Method used

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  • Photovoltaic optimizer for providing stable output voltage and application thereof
  • Photovoltaic optimizer for providing stable output voltage and application thereof
  • Photovoltaic optimizer for providing stable output voltage and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preferred solution is as Figure 1 to Figure 3 As shown, a photovoltaic optimizer that provides a stable output voltage includes a data acquisition and processing unit, an MPPT control unit, and a Buck converter unit. The MPPT control unit includes an MPPT main circuit and an MPPT auxiliary circuit. The input end of the MPPT main circuit is used to connect Photovoltaic modules, the output end of the MPPT main circuit is electrically connected to the input end of the Buck converter unit, the output end of the Buck converter is used to output stable DC power, and the MPPT auxiliary circuit is used to control the on-off of the power switch tube in the MPPT main circuit; data acquisition and processing The unit is used to collect voltage and current signals at the input end of the MPPT main circuit, and the data collection and processing unit is electrically connected to the MPPT auxiliary circuit.

[0029] The input side of the photovoltaic optimizer is connected to th...

Embodiment 2

[0033] The MPPT main circuit can only achieve the effect of maximum power tracking. In this embodiment, a Buck circuit is added so that the output side can output the required stable DC power. The scheme is as follows:

[0034] The main circuit of photovoltaic optimizer includes power switch S2, diode D2, inductor L2 and capacitor C3; the drain of power switch S2 is connected to the cathode of diode D1, the source of power switch S2 is respectively connected to the cathode of diode D2 and one end of inductor L2, and the diode The anode of D2 is connected to the negative pole of the photovoltaic module, the other end of the inductor L2 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the negative pole of the photovoltaic module. In this embodiment, the output terminal of the photovoltaic optimizer can output the required stable direct current. It can directly supply power to DC loads.

Embodiment 3

[0036] Preferably, a kind of working method of the photovoltaic optimizer that provides stable output voltage comprises the steps:

[0037] S1: The data acquisition and processing unit automatically changes the voltage and current step size according to the collected voltage and current conditions, and quickly tracks to the maximum power point;

[0038] S2: Stop the disturbance after tracking the maximum power point, and output the maximum power stably and continuously;

[0039] S3: By detecting sudden changes in voltage and current to detect environmental changes, so as to re-track the maximum power point in the new environment;

[0040] S4: Obtain the duty cycle of the power switch tube S1 through the MPPT auxiliary circuit, and control the on-off of the power switch tube S1, and then convert the direct current into the required stable voltage through the Buck circuit.

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Abstract

The invention discloses a photovoltaic optimizer for providing a stable output voltage and application thereof. The photovoltaic optimizer comprises an MPPT control unit, and the MPPT control unit comprises an MPPT main circuit and an MPPT auxiliary circuit; the input end of the MPPT main circuit is used for connecting a photovoltaic module, the output end of the MPPT main circuit is electrically connected with the input end of a Buck converter unit, the output end of the Buck converter unit is used for outputting a stable direct current, and the MPPT auxiliary circuit is used for controlling the on-off of a power switch tube in the MPPT main circuit; the data acquisition and processing unit is used for acquiring voltage and current signals of the input end of the MPPT main circuit, and the data acquisition and processing unit is electrically connected with the MPPT auxiliary circuit. According to the invention, the maximum power of the photovoltaic module can be tracked, the direct current generated by the photovoltaic module can be converted into the stable direct current capable of directly supplying power to the direct current load, and the power generation power of the photovoltaic module and the power utilization efficiency of the load side are improved. And the system can play a great role in promoting the rapid construction of a 5G base station and the vigorous development of a direct-current rapid charging pile.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, in particular to a photovoltaic optimizer providing stable output voltage and its application. Background technique [0002] In recent years, in order to cope with the depletion of fossil energy, environmental pollution and climate change, photovoltaic power generation technology is becoming the focus of research and utilization in various countries. Since photovoltaic power generation is greatly affected by the external environment, in order to improve the power generation efficiency of photovoltaic cells, the Maximum Power Point Tracking (MPPT for short) technology is introduced to enable photovoltaic cells to obtain maximum power output. [0003] One of the disadvantages of the current photovoltaic power generation system is that the DC power generated by photovoltaics is usually converted into AC mains power through an inverter. When the load is a DC load, the AC mains p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30H02M3/156H02J13/00H02M7/42G05F1/67
CPCH02S40/30H02M3/156H02J13/00002H02J13/00006H02J13/00016H02J13/00026H02M7/42G05F1/67H02J2300/26Y02E10/56
Inventor 郑含博杜齐胡永乐郭文豪覃团发
Owner GUANGXI UNIV
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