Maximum power point tracking circuit and method of off-grid photovoltaic heat storage system

A technology of maximum power point and tracking circuit, applied in the field of photovoltaics, can solve the problem of large power loss, and achieve the effect of improving economic benefits and reducing photovoltaic power

Pending Publication Date: 2021-02-23
BEIJING NEGO AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Because the thermal load is not controlled, the power loss is relatively large

Method used

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  • Maximum power point tracking circuit and method of off-grid photovoltaic heat storage system
  • Maximum power point tracking circuit and method of off-grid photovoltaic heat storage system
  • Maximum power point tracking circuit and method of off-grid photovoltaic heat storage system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0052] An embodiment of the present invention discloses a maximum power point tracking circuit of an off-grid photovoltaic heat storage system, such as image 3 As shown, the system includes a photovoltaic panel A, a photovoltaic converter B for converting the direct current output by the photovoltaic panel into an alternating current, and a thermal load R, and the tracking circuit includes:

[0053] Load controller C, N contactors K and M remote IO modules D;

[0054] Wherein, the first end of each contactor in the contactors is connected to the output end of the photovoltaic converter B, and the second end of each contactor is respectively connected to a heat load;

[0055] Each of the remote IO modules D is connected to one or more of the contactors;

[0056] The load controller C is used for sampling the output voltage of the photovoltaic converter B, and according to the comparison between the output voltage and the predetermined voltage, the remote IO module D controls ...

no. 2 example

[0065] Such as Figure 5 As shown, an embodiment of the present invention also discloses an off-grid photovoltaic heat storage system, including

[0066] Photovoltaic panel A;

[0067] Photovoltaic converter B used to convert the direct current output by the photovoltaic panel into alternating current;

[0068] According to the tracking circuit described in the first embodiment; and the thermal load R.

[0069] In a specific embodiment, the tracking circuit includes: a load controller C, 6 contactors K and 2 remote IO modules D.

[0070] When the off-grid photovoltaic heat storage system is running, the load controller C measures the output voltage of the photovoltaic converter B, and the load controller C calculates the output voltage of the photovoltaic converter B based on the measured output voltage through a control algorithm. The number of pull-in contactors K, the load controller C transmits the command to the remote IO module D through communication, and the remote ...

no. 3 example

[0073] Such as Figure 4 As shown, an embodiment of the present invention also discloses a method for controlling the tracking circuit described in the first embodiment, including:

[0074] The photovoltaic cell panel outputs direct current according to light irradiation;

[0075] The photovoltaic converter converts the direct current into alternating current;

[0076] The load controller C samples the AC voltage output by the photovoltaic converter B, and according to the comparison between the AC voltage and a predetermined voltage, enables the remote IO module D to control the pull-in and break-off of the connected contactor, and the thermal load Switching in and out, so as to realize the maximum power point tracking function of the off-grid photovoltaic heat storage system.

[0077] In a specific embodiment, it also includes when the output voltage of the photovoltaic converter B sampled by the load controller C is greater than or equal to the first set voltage U H At t...

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PUM

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Abstract

One embodiment of the invention discloses a maximum power point tracking circuit and method for an off-grid photovoltaic heat storage system. The system comprises a photovoltaic cell panel, a photovoltaic converter which is used for converting a direct current outputted by the photovoltaic cell panel into an alternating current, and thermal loads. The tracking circuit comprises a load controller,N contactors and M remote IO modules, wherein the first end of each contactor in the contactors is connected with the output end of the photovoltaic converter, the second end of each contactor is connected with one thermal load, and each remote IO module is connected with one or more contactors; the load controller is used for sampling the output voltage of the photovoltaic converter, enabling theremote IO modules to control the pull-in and disconnection of the connected contactors according to the comparison of the output voltage and a preset voltage, and carrying out the switching-in and switching-out of the thermal loads, thereby achieving the maximum power point tracking function of the off-grid photovoltaic heat storage system.

Description

technical field [0001] The invention relates to the field of photovoltaic technology. More specifically, it relates to a maximum power point tracking circuit, system and method for an off-grid photovoltaic heat storage system. Background technique [0002] In the existing off-grid photovoltaic thermal storage system, the thermal load is not controlled during operation. Such as figure 1 As shown, the output of photovoltaic panel A is connected to photovoltaic converter B; the input of photovoltaic converter B is connected to photovoltaic panel A, and the output of photovoltaic converter B is connected to thermal load R, a total of 6 thermal loads R. [0003] by figure 1 As an example, according to the implementation example, the maximum power of photovoltaic panel A is 176kW, and the voltage at this time is 600VDC; the open circuit voltage of photovoltaic panel A is 780VDC. The rated output voltage of photovoltaic converter B is 400VAC. The rated power of each group of h...

Claims

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Application Information

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IPC IPC(8): H02S10/20H02S40/30G05F1/67
CPCH02S10/20H02S40/30G05F1/67Y02E70/30Y02E10/56
Inventor 王亚非贾利民金成日张晓宁
Owner BEIJING NEGO AUTOMATION TECH
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