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Multi-input turn-off device, control method and photovoltaic power generation system

A multi-input, disconnector technology, used in photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve the problems of high cost and large number of diodes, and achieve the effect of improving efficiency, reducing heat generation, and reducing bypass loss.

Active Publication Date: 2022-02-15
杭州禾迈电力电子股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

A further improvement is to connect a bypass diode D3 in parallel at the output end of the switch. When both the first photovoltaic module and the second photovoltaic module are abnormal or the controller is abnormal, the first photovoltaic module and the second photovoltaic module are bypassed through the bypass diode D3. The second photovoltaic module, thereby reducing the freewheeling loss and heat generation, but this method requires a large number of diodes and high cost

Method used

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  • Multi-input turn-off device, control method and photovoltaic power generation system
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  • Multi-input turn-off device, control method and photovoltaic power generation system

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Embodiment Construction

[0038] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings, but these embodiments do not limit the present invention, those skilled in the art make structural, method, or functional changes based on these embodiments All are included in the scope of protection of the present invention.

[0039]When an element is referred to as being "connected to" or "coupled to" another element, the element may be directly on, connected to, or coupled to the other element, or intervening elements may be present. . However, when an element is referred to as being "directly connected to" or "directly coupled to" another element, there are no intervening elements present. To this end, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0040] figure 2 It is a schematic circuit structure diagram of the multi-input switch according t...

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Abstract

The invention discloses a multi-input turn-off device, which comprises a first input end coupled with a first photovoltaic unit; at least one second input end which is coupled with a second photovoltaic unit, wherin each the second photovoltaic unit comprises at least one battery substring and a fly-wheel diode connected in parallel with the battery substring; a first turn-off module which at least comprises a first switch tube and a first bypass tube, wherein the first bypass tube provides a follow current channel for power bus current when the first photovoltaic unit is abnormal; at least one second turn-off module which at least comprises a second switch tube; and a control module which controls the first switch tube and the second switch tube to be switched on and switched off according to the monitoring signal and the communication signal, wherein when the second photovoltaic unit is abnormal, the control module controls the second switch tube to be switched on, and the second switch tube and a fly-wheel diode connected with the battery in series and parallel in the second photovoltaic unit provide a fly-wheel channel for power bus current. According to the invention, a built-in freewheeling diode of the photovoltaic module is multiplexed, a bypass tube of a turn-off module in the turn-off device is omitted, and bypass loss is reduced.

Description

technical field [0001] The invention relates to the technical field of distributed photovoltaic power generation, in particular to a multi-input switch, a control method, and a photovoltaic power generation system. Background technique [0002] Due to the renewable and clean nature of solar energy, photovoltaic power generation technology has developed rapidly. The string photovoltaic power generation system has been widely used in the field of photovoltaic power generation due to its mature technology, high conversion efficiency, and low price. When a fire occurs in the photovoltaic power generation system, it will bring great safety hazards to the firefighters' fire fighting operations. The existing solution is to configure component-level rapid shutdown equipment for each photovoltaic module, such as a switch. In the event of an abnormal situation such as a fire, the output of each photovoltaic module is cut off through the switch to reduce the output of the photovoltaic...

Claims

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Application Information

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IPC IPC(8): H03K17/00H03K17/56H02S40/30
CPCH03K17/005H03K17/56H02S40/30Y02E10/50
Inventor 禹红斌蔡燕亮荣强赵一杨波
Owner 杭州禾迈电力电子股份有限公司
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