Temperature prediction method for photovoltaic inverter element installed on open type support

A technology of photovoltaic inverter and prediction method, applied in the direction of instrumentation, calculation, electrical digital data processing, etc.

Inactive Publication Date: 2015-09-16
HOHAI UNIV CHANGZHOU
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there is little to discuss the temperature calculation and reliability evaluation of the inverter, from the perspective of the environment and operating conditions of the PV system, such as irradiance, ambient temperature, and PV system configuration.

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  • Temperature prediction method for photovoltaic inverter element installed on open type support
  • Temperature prediction method for photovoltaic inverter element installed on open type support
  • Temperature prediction method for photovoltaic inverter element installed on open type support

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Embodiment Construction

[0094] The present invention will be described in further detail in conjunction with the accompanying drawings and specific embodiments.

[0095] According to the temperature calculation model of power transformer components, the transformer winding hot spot temperature is the sum of three parts: the ambient temperature, the top oil temperature rise and the hot spot temperature rise exceeding the maximum oil temperature, that is, the hot spot temperature of a component is obtained by adding the ambient temperature to the maximum The oil temperature rise and the hot spot temperature rise are calculated. The function and structure of the photovoltaic inverter components are similar to those of the power transformer components. The temperature of the same photovoltaic inverter components can be calculated as follows:

[0096] T C =T A +ΔT H +ΔT C (1)

[0097] Among them, T A is the ambient temperature, ΔT H is the temperature rise of the radia...

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Abstract

The invention discloses a temperature prediction method for a photovoltaic inverter element installed on an open type support. Firstly, a photovoltaic inverter element temperature prediction equation is established according to the function and structure, similar to those of a power transformer element, of the photovoltaic inverter element; secondly, photovoltaic inverter radiator temperature rise and inverter element temperature rise are worked out respectively; finally, the temperatures of a main electronic element capacitor and an IGBT of a photovoltaic inverter are obtained. An air speed factor c and a radiator factor k are introduced, and the radiator factor k is an important variable which can reflect thermal performance of the photovoltaic inverter; it can be precisely predicted that the radiating temperature of general inverters is + / -3 DEG C, and the differences between the values, obtained through analog computation, of radiating coefficients obtained at different air speeds and actually measured values are smaller than 10%.

Description

technical field [0001] The invention relates to a method for predicting the temperature of a photovoltaic inverter element installed on an open bracket, and belongs to the technical field of photovoltaic inverters. Background technique [0002] The inverter is an integral part of the photovoltaic system and must operate normally to ensure the maximum output of the system. The life-cycle reliability of power electronic equipment largely depends on the operating temperature, which depends on the load and environmental conditions. In air-cooled inverters, fans and heat sinks are used to relieve the heating element temperature in order to improve long-term reliability. Operating temperature is generally related to the mean time between failures (MTBF) of electrical components. [0003] It is very important to have an accurate temperature value of the program element in practical application. R. Bharti, et al., "Nominal operating cell temperature (NOCT): effects of module size...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 张臻徐夏天单力杜嵩徐永晨刘升白建波王磊
Owner HOHAI UNIV CHANGZHOU
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