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MEXICO ACEROS DM STEEL PLANT SVC PROJECT A CONTAINERIZED SVC

Customer Needs
Before the year 2016, there are no strict power quality requirement in Mexico power grids, so that Aceros DM Steel Plant only handled harmonics and power factor corrections for their big impact loads. However during recent years, Mexican power grids had published strict power quality rules in which the reactive power injections, voltage fluctuations and flicker, as well as three phase unbalance issues have been clearly specified and regulated.

Aceros DM steel plant need to comply with it asap.


RXPE SOLUTION
After a site inspection and measurement together with our local partner DIRAM, it had been found that the existing harmonic filters are not capable to handle these new requirements, but a new dynamic compensation system is demanded.



RXPE then performed a careful system study and proposed an 110Mvar SVC at the plant's 230kV substa-tion which can solve the problem. The SVC was rated as -10Mvar (inductive) to +100Mvar (capacitive) with a total dynamic reactive power range of 110Mvar, connected at the substation existing 13.BkV busbar (same with the EAF).
Considering of harmonic generations from EAF/LF furnaces and the SVC TCR branches (thyristor controlled reactor), the harmonic filters are designed as 2nd /3rd /4th /5th four branches.
A containerized solution was applied in this project considering of the site conditions, in which the thyristor valve, cooling system, C&P cubicles are integrated inside the container (so that no need to build control room anymore meanwhile aiming for shorten site commission-ing time).



RXPE-11A C&P system was equipped in this project, with our powerful "open- & close-loop" control firmware. Below is comparison of realtime flicker measurements between "const var control (no flicker mitigation)" and our patented open- & close-loop control during one single charge of the furnace, implemented by shifting different control modes manually on the HMI. It shows the RXPE SVC flicker mitigation factor reached more than 50% (approaching the technical limit).

Customer Benefits
Aceros DM steel plant SVC was commissioned in July 2018. It had successfully solved all the above mentioned power quality problems, fully complied with the new Mexican grid code; meanwhile also enhanced the EAF production due to improved power supply and smoothed voltages.





Liaoning Rongxin Xingye Power Tech Co., Ltd
108 Keji Rd., Anshan 114051 China
Email: overseas@rxpe.com


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