For the sake of reliable power operation and transmission through ±800 kV UHVDC line from Qinghai to Henan, China, which is the world's first ultra-high-voltage power transmission channel for clean energy, harsh regulations are newly formulated by Power Dispatch Control Center of Qinghai Province & China Electric Power Research Institute. Per the regulations, all PV plants in Qinghai are required to perform stably even when the short circuit ratio falls to 1.5, and inverters must have the ability of high voltage, low voltage and continuous voltage riding through AC or DC faults of the grid.
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First VDE compliance certificate issued to Sungrow
Sungrow inverters, which have been stably running for over 10 years, successfully passed all the tests and can meet the latest grid connect standards only through a software upgrade. Other brand inverters may need to be replaced entirely, as the company might have exited the inverter business or it cannot upgrade because of technical issues. Compared with replacing parts or the entire inverters at the end of their service life, upgrading the software is a more ideal way for the technical transformation of old PV plants to save cost and improve power generation. (mfo)
