(EnergyAsia, April 3) — Emerson Process Management said its Ovation¨ expert control system has been successfully implemented at Huaneng’s Yuhuan Power Plant Units 1 and 2.   US-based Emerson won the $7 million contract to automate the four unit, 4,000-MW, coal-fired plan in April 2005.   The plant, which is owned by Huaneng Power International…