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Inverter over-temperature protection control method, control device and control system thereof

An over-temperature protection and control device technology, applied in the direction of emergency protection circuit device, automatic disconnection emergency protection device, circuit device, etc., can solve the problem of low utilization rate of power supply energy and achieve the effect of improving utilization rate

Active Publication Date: 2018-05-22
BEIJING ETECHWIN ELECTRIC
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Problems solved by technology

[0003] The purpose of the exemplary embodiment of the present invention is to provide an inverter over-temperature protection control method, control device and control system to solve the problem of the energy utilization rate of the power supply in the process of over-temperature protection control of the inverter in the prior art. lower technical issues

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  • Inverter over-temperature protection control method, control device and control system thereof

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Embodiment Construction

[0036] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.

[0037] figure 1 A schematic structural diagram of a modularized inverter according to an exemplary embodiment of the present invention is shown.

[0038] Generally speaking, a modular inverter may include IGBT modules connected in parallel and each IGBT module has the same rated power, and each IGBT module has the same input power. In addition, when the power derating process is performed on each IGBT module, each IGBT module is controlled to act simultaneously, and the target power of each IGBT module is also the same after the power derating process is performed.

[0039] figure 1 A modular inverter comprising three IGBT modules is shown, and as would be understood by those skilled in the art, figure 1 The number of IGBT modules shown in is just an example, and more or less number of IGBT modules can be included ac...

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Abstract

The invention provides an inverter over-temperature protection control method, a control device and a control system thereof. The inverter comprises parallelly connected IGBT modules. The method comprises the steps of determining the temperature of each leg in each IGBT module which works currently; detecting whether the temperature of each leg is higher than a temperature protection threshold; ifnot, detecting whether the temperature of each leg is higher than an over-temperature reducing threshold; and if the temperature of at least one leg is higher than the over-temperature reducing threshold, performing power reduction processing on each IGBT module which works currently, wherein the temperature protection threshold is higher than the over-temperature reducing threshold. The inverterover-temperature protection control method, the control device and the control system according to the exemplary embodiment of the invention can perform over-temperature protection based on leg temperature change of each IGBT module in the modular inverter, thereby effectively improving power energy utilization rate.

Description

technical field [0001] The present invention generally relates to the technical field of new energy power generation, and more specifically relates to an inverter over-temperature protection control method, control device and control system. Background technique [0002] In photovoltaic systems and wind power systems, IGBT modules are mainstream power devices. In a wind power system or a photovoltaic system, as the power density increases, the current flowing through the IGBT module becomes larger, and the temperature characteristics of the IGBT module will be affected by factors such as radiators, installation processes, and heat dissipation structures. The temperature protection of the IGBT module will be triggered. The temperature protection of the IGBT module is usually based on the threshold judgment of the real-time temperature of the IGBT module, and some control is based on the temperature change rate, but its essence is only based on the threshold judgment or tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122H02H5/04
Inventor 赵立勇赵帅央
Owner BEIJING ETECHWIN ELECTRIC
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