Temperature rise test system and method for photovoltaic inverter in field operation condition

Abstract

The invention provides a temperature rise test system and method for a photovoltaic inverter in a field operation condition. The system comprises a signal transceiver antenna, a signal acquisition controller, and passive wireless temperature sensors installed at a plurality of test points in a photovoltaic inverter cabinet and connected to the plurality of test points one to one. The passive wireless temperature sensors are connected to the signal acquisition controller through the signal transceiver antenna in a radiofrequency manner. The signal acquisition controller further includes a calculation module configured to calculate the temperature rise values of respective components in the inverter cabinet according to results measured by the passive wireless temperature sensors. The systemuses the passive wireless temperature sensors using radiofrequency identification technology, can realize simultaneous measurement of multiple external temperature points in the cabinet and temperature points outside the cabinet under the normal operating condition of the photovoltaic inverter, and enables an inverter to operate in a maximum output power operating state by a DC input square matrix combining method, thereby obtaining the maximum operation temperature rise of the inverter.

Description

technical field [0001] The invention belongs to the field of on-site testing of photovoltaic inverters, and in particular relates to a temperature rise testing system and method under on-site operating conditions of photovoltaic inverters. Background technique [0002] In recent years, the photovoltaic industry has developed rapidly. Photovoltaic inverters are one of the core equipment of photovoltaic power generation. Working in the environment of high current and strong magnetic field for a long time, they are prone to local overheating, causing fires and large-scale power outages. However, the climatic conditions in different locations are varied, and the results of laboratory type tests cannot reflect the temperature rise of inverters at the photovoltaic power plant site. In the field of inverter temperature rise test, there are mainly infrared temperature measurement method, optical fiber temperature measurement method and acoustic surface temperature measurement metho...

AI Technical Summary

Problems solved by technology

However, when the surface of the optical fiber is polluted, it will cause discharge along the surface of the optical fiber. In addition, it is easy to break, easy to break, and not resistant to high temperature. Due to the influence of the structure of the switch cabinet, it is difficult to wire in the cabinet.

[0006] Acoustic surface temperature measurement uses passive wireless sensors, but it is limited by the principle of bandwidth slicing and signal simulation processing technology of acoustic surface temperature measurement. Large jumps, too many sensors cannot be installed, otherwise the receiving system cannot distinguish

[0007] Patent CN201210073736 "A Temperature Rise and Efficiency Test System and Method for High-Power Photovoltaic Inverter at Rated Power" proposes to install a temperature sensor on the power unit of the inverter to realize the temperature rise test of the photovoltaic inverter at rated power , but the patent focuses on the inverter efficiency test, and does not explain the temperature sensor type, test principle, specific use method, etc. of the temperature rise test, and the system and method are used in the product development and product delivery experiment stages

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