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Control device and combiner box

A control device and combiner box technology, applied in circuit devices, control/regulation systems, AC network circuits, etc., can solve problems such as inrush currents that are prone to occur

Active Publication Date: 2017-07-28
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a control device and a combiner box to solve the problem in the prior art that inrush currents are prone to occur when the combiner box is disconnected and connected during component maintenance

Method used

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  • Control device and combiner box

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0043] The invention provides a control device to solve the problem in the prior art that surge currents are likely to occur when the combiner box is disconnected and connected during component maintenance.

[0044] The control device is applied to a photovoltaic power generation system, such as figure 2 As shown, it includes an inverter and a plurality of combiner boxes, the input end of each combiner box is connected to at least one string connected with an optimizer, and the output end ...

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Abstract

The present invention provides a control device and a combiner box. The module maintenance is required, an optimizer connected with a corresponding combiner box is controlled to operate in a safety mode, and disconnection signals are output when the output current of the corresponding combiner box is smaller than a threshold to switch off the connection between the combiner box and an inverter, so as to reduce the impact current of arc on the optimizer. After the maintenance is completed, the optimizer connected with the corresponding combiner box is controlled to operate in an MPPT mode, and when the input voltage of the combiner box is larger than output voltage of the combiner box and namely the output voltage of the corresponding string is gradually increased to exceed the direct current bus voltage, the connection between the combiner box and the inverter is closed so as to avoid the impact current caused by too large voltage difference between the direct current bus voltages when the combiner box accesses the inverter.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a control device and a combiner box. Background technique [0002] Existing photovoltaic combiner boxes are mainly used in centralized photovoltaic power generation systems, such as figure 1 shown. Conventional combiner boxes usually have module components such as input terminals, output terminals, circuit breakers, fuse boxes, lightning protection modules, voltage, current and temperature detection circuits, control systems, and switching power supplies. The detection circuit of the combiner box can detect parameters such as the input voltage and current of each group string, the output voltage and current, and the temperature of the chassis; the fuse box and the lightning protection module serve as overcurrent protection and surge protection respectively; the control system can The relevant data is sent to the inverter or the client; the circuit breaker ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02S40/34
CPCH02J3/383H02J3/385H02S40/34G05F1/67Y02E10/56H02J3/38
Inventor 王新宇徐君顾亦磊谷雨
Owner SUNGROW POWER SUPPLY CO LTD
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