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A photovoltaic inverter auxiliary power supply and start-stop control method

A photovoltaic inverter and auxiliary power supply technology, applied in the photovoltaic field, can solve the problems of unaffordable photovoltaic inverter auxiliary power supply, lower output voltage, repeated start and stop under insufficient light conditions, etc.

Active Publication Date: 2019-04-09
SUNGROW SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the light is weak, the open-circuit output voltage of the DC output device is high, but the load capacity is low. After the auxiliary power supply of the photovoltaic inverter is started, the DC output device cannot bear the energy required by the entire auxiliary power supply of the photovoltaic inverter. The rapid drop causes the auxiliary power supply of the photovoltaic inverter to stop working. At this time, the DC output device is equivalent to an open circuit. When the open circuit voltage is high and reaches the starting voltage of the auxiliary power supply of the photovoltaic inverter, the auxiliary power supply of the photovoltaic inverter starts again, and the cycle repeats. , causing the auxiliary power supply of the photovoltaic inverter to start and stop repeatedly in the case of insufficient light, which in turn causes the photovoltaic inverter to start and stop repeatedly in the case of insufficient light

Method used

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  • A photovoltaic inverter auxiliary power supply and start-stop control method
  • A photovoltaic inverter auxiliary power supply and start-stop control method
  • A photovoltaic inverter auxiliary power supply and start-stop control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] See figure 1 , which shows a schematic diagram of the logical structure of the photovoltaic inverter auxiliary power supply provided in this application. The photovoltaic inverter auxiliary power supply includes: a rectification circuit 11 , a conversion circuit 12 , a control circuit 13 and an enabling circuit 14 .

[0098] The input end of the rectification circuit 11 is connected to the grid connected to the inverter to which the auxiliary power supply of the photovoltaic inverter belongs, the output end of the rectification circuit 11 is connected to the first input end of the conversion circuit 12, and the conversion The output end of the circuit 12 is connected with each device in the inverter to which the auxiliary power supply of the photovoltaic inverter belongs.

[0099] The first input end of the enabling circuit 14 is connected to the output end of the photovoltaic module, the output end of the enabling circuit 14 is connected to the first input end of the c...

Embodiment 2

[0118] In this example, in figure 2 Another auxiliary power supply for photovoltaic inverters is extended on the basis of the auxiliary power supply for photovoltaic inverters shown, please refer to image 3 ,exist figure 2 On the basis of the photovoltaic inverter auxiliary power shown, the control circuit 13 further includes an OR logic circuit 132 .

[0119] The output terminal of the signal isolation circuit 143 is connected to the first input terminal of the OR logic circuit 132 , and the output terminal of the OR logic circuit 132 is connected to the input terminal of the control chip 131 .

[0120] The signal isolation circuit 143 is configured to output the high-level first enable signal or the low-level first enable signal to the first input terminal of the OR logic circuit 132 .

[0121] The second input end of the OR logic circuit 132 is used as the second input end of the control circuit 13, and is connected to the control unit in the inverter, and is used to r...

Embodiment 3

[0132] In this example, in image 3 Another auxiliary power supply for photovoltaic inverters is extended on the basis of the auxiliary power supply for photovoltaic inverters shown, please refer to Figure 4 ,exist image 3 On the basis of the auxiliary power supply of the photovoltaic inverter shown, the second input terminal of the voltage stabilizing circuit 141 is used as the second input terminal of the enabling circuit 14, and is connected to the control unit in the inverter for After receiving the shutdown signal output by the control unit after the conversion circuit 12 outputs the inverter power supply voltage to each device in the inverter, and after a preset time interval.

[0133] The voltage stabilizing circuit 141 is configured to cut off the power supply voltage of the voltage stabilizing circuit 141 , the hysteresis comparison circuit 142 and the signal isolation circuit 143 when receiving the shutdown signal.

[0134] The OR logic circuit 132 is configured ...

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Abstract

The invention provides a photovoltaic inverter auxiliary power supply and a start-stop control method. The photovoltaic inverter auxiliary power supply is characterized in that an input terminal of a rectification circuit is connected to a power grid connected to an inverter of the photovoltaic inverter auxiliary power supply; an output terminal of the rectification circuit is connected to a first input terminal of a conversion circuit; an output terminal of the conversion circuit is connected to each equipment in the inverter of the photovoltaic inverter auxiliary power supply; a first input terminal of an enable circuit is connected to an output terminal of a photovoltaic assembly; an output terminal of the enable circuit is connected to a first input terminal of a control circuit; an output terminal of the control circuit is connected to a second input terminal of the conversion circuit; and the rectification circuit converts an alternating voltage acquired from the power grid into a direct voltage and outputs the direct voltage to the first input terminal of the conversion circuit. In the invention, by using the photovoltaic inverter auxiliary power supply, a repeated start-stop condition can be avoided when illumination is insufficient so that a condition that the photovoltaic inverter is started and stopped repeatedly because a needed voltage is insufficient is avoided.

Description

technical field [0001] The present application relates to the field of photovoltaics, in particular to an auxiliary power supply for a photovoltaic inverter and a start-stop control method. Background technique [0002] When the photovoltaic inverter is powered by the auxiliary power supply of the photovoltaic inverter, the auxiliary power supply of the photovoltaic inverter is connected to the DC side of the photovoltaic panel or the photovoltaic inverter (connected to the photovoltaic panel after passing through the converter), and the photovoltaic inverter The DC side is connected to a DC output device (such as a photovoltaic module). The auxiliary power supply of the photovoltaic inverter draws power from the DC side of the photovoltaic inverter. Under weak light conditions such as early morning, dusk or rain, the auxiliary power supply of the photovoltaic inverter will start and stop repeatedly. The reason is: after the output voltage of the DC output device reaches th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCY02E10/56
Inventor 刘宝其肖永利徐运燕
Owner SUNGROW SHANGHAI CO LTD
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