Method And Arrangement For Operating Photovoltaic System And The Photovoltaic System

A photovoltaic system and photovoltaic panel technology, applied in the field of photovoltaic systems, can solve the problems of high continuous power loss and high cost, and achieve the effect of avoiding reverse current

Inactive Publication Date: 2014-09-10
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A disadvantage associated with the use of reverse blocking diodes is that the diodes are always connected in series to the corresponding string, so that the string current always flows through the diode and may result in higher continuous power losses due to the effect of the voltage drop across the diode junction
The use of diodes also creates an additional cost
The disadvantage associated with the use of circuit breakers is that circuit breakers cause additional costs that are higher than the cost of diodes or fuses

Method used

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  • Method And Arrangement For Operating Photovoltaic System And The Photovoltaic System
  • Method And Arrangement For Operating Photovoltaic System And The Photovoltaic System
  • Method And Arrangement For Operating Photovoltaic System And The Photovoltaic System

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Embodiment Construction

[0015] The application of the present invention is not limited to any particular system, but can be used in connection with various electrical systems. Furthermore, the use of the present invention is not limited to systems utilizing any particular fundamental frequency or any particular voltage level.

[0016] figure 1 An example of a photovoltaic system is shown. The figure shows only the components necessary to understand the invention. figure 1 The exemplary system includes two photovoltaic generators 200A, 200B each comprising a plurality of strings 20 of photovoltaic panels 21, wherein the strings 20 within the photovoltaic generators 200A, 200B are connected in parallel to each other . The string 20 comprises a plurality of photovoltaic panels 21 connected in series with each other. Each of the photovoltaic panels 21 may include one or more photovoltaic modules. figure 1 The exemplary system also includes two boost converters (boost converters) 10 . The term "boos...

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Abstract

A method and an arrangement for operating a photovoltaic system, and the photovoltaic system are provided. The photovoltaic system comprises a boost converter (10A, 10B) having a controllable duty ratio; at least two strings (20) of photovoltaic panels supplying an input of the boost converter (10A, 10B), wherein the strings are connected in parallel with each other; detection means (30, 31) configured to detect a reverse current in any of the strings (20); and control means (40) configured to increase, in response to the detection means detecting a reverse current in at least one of the strings (20), the duty ratio of the boost converter (10A, 10B) at least insomuch that the reverse current stops.

Description

technical field [0001] The invention relates to a method for operating a photovoltaic system, an arrangement for controlling a photovoltaic system and a photovoltaic system. Background technique [0002] A photovoltaic generator may comprise, for example, two or more strings of photovoltaic (PV) panels (including one or more photovoltaic modules) connected in parallel to supply power to a common power converter. If one of such parallel connected strings becomes passive, i.e. its open circuit voltage is reduced due to, for example, severe shading or failure of a PV panel, that string can be considered by flowing in the opposite direction relative to the direction of normal operation current of one string to start absorbing and dissipating power generated by other strings connected in parallel to the same power converter. Therefore, such a current flowing in the opposite direction with respect to the direction of normal operation is called a reverse current. [0003] Especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/32H02S50/00
CPCH01L31/02021Y10T307/549Y02E10/50H02M3/156Y02E10/56
Inventor 约纳斯·普科拉里·诺西艾宁
Owner ABB (SCHWEIZ) AG
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