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Systems and methods for overvoltage protection in photovoltaic systems

An overvoltage and voltage technology, applied in the field of electric power systems, can solve the problems of inverter input voltage exceeding the maximum rated value, serious inverter damage, and permanent damage.

Active Publication Date: 2015-12-16
NAT SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under certain conditions known as string overvoltage, the power differential can cause the inverter input voltage to exceed the inverter's maximum rating, causing serious and permanent damage to the inverter

Method used

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  • Systems and methods for overvoltage protection in photovoltaic systems
  • Systems and methods for overvoltage protection in photovoltaic systems
  • Systems and methods for overvoltage protection in photovoltaic systems

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Embodiment Construction

[0021] discussed later Figure 1 to Figure 6 And the various embodiments used to describe the principles of the disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged photovoltaic array system.

[0022] figure 1 An example photovoltaic (PV) array system 100 is shown in accordance with an embodiment of the disclosure. figure 1 The illustrated embodiment of the PV array system 100 is for illustration only. Other embodiments of the PV array system 100 may be used without departing from the scope of this disclosure.

[0023] PV array system 100 includes a plurality of solar panels 105a-105d (collectively solar panels 105). The solar panels 105 are arranged in series, in parallel, or both. For example, first string 110 includes solar panel 105a coupled in serie...

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PUM

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Abstract

A photovoltaic array for use in an electrical power system comprising a plurality of photovoltaic modules (105a-105d, 105) and a voltage converter (125) coupled to at least one photovoltaic module. The photovoltaic array also includes overvoltage protection circuitry (130, 400, 500). The overvoltage protection circuit includes an interface suitable for coupling to the output of the voltage converter. The overvoltage protection circuit also includes a spike detector configured to detect voltage spikes in the output voltage of the voltage converter. The overvoltage protection circuit further includes a voltage control module configured to adjust an output voltage slew rate of the voltage converter in response to the overvoltage signal received from the spike detector.

Description

[0001] Cross References and Priority Claims to Related Applications [0002] This application claims priority under 35 U.S.C §119(e) to U.S. Provisional Patent Application No. 61 / 170,585, filed April 17, 2009, which is hereby incorporated by reference. technical field [0003] The present application relates generally to electrical power systems, and more particularly to systems and methods for overvoltage protection in photovoltaic power systems. Background technique [0004] Photovoltaic (PV) panels (also referred to herein as "solar panels") use radiant light from the sun to generate electrical energy. Solar panels include multiple PV cells that convert sunlight into electricity. Most solar panels use wafer-based crystalline silicon cells or thin-film cells based on cadmium telluride or silicon. Crystalline silicon, commonly used in PV cells in wafer form, is derived from silicon, a common semiconductor. PV cells are semiconductor devices that directly convert light in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20
CPCH02M1/32Y02E10/56
Inventor S·萨尔翰
Owner NAT SEMICON CORP